From 1f043fb6948e21894c32bd0e60a26f109b10edca Mon Sep 17 00:00:00 2001
From: winPond <db_smpond@163.com>
Date: Sat, 6 Jul 2019 15:59:43 +0800
Subject: [PATCH] HomeWork 8 is done

---
 xv6-public/.cvsignore                         |   16 +
 xv6-public/.dir-locals.el                     |    4 +
 xv6-public/.gdbinit.tmpl                      |   27 +
 xv6-public/.gitignore                         |   16 +
 xv6-public/BUGS                               |    7 +
 xv6-public/LICENSE                            |   24 +
 xv6-public/Makefile                           |  296 +++
 xv6-public/Notes                              |  123 ++
 xv6-public/README                             |   50 +
 xv6-public/TRICKS                             |  140 ++
 xv6-public/alarmtest.c                        |   25 +
 xv6-public/asm.h                              |   18 +
 xv6-public/bio.c                              |  144 ++
 xv6-public/bootasm.S                          |   88 +
 xv6-public/bootmain.c                         |   96 +
 xv6-public/buf.h                              |   14 +
 xv6-public/cat.c                              |   43 +
 xv6-public/console.c                          |  299 +++
 xv6-public/cuth                               |   48 +
 xv6-public/date.c                             |   20 +
 xv6-public/date.h                             |    8 +
 xv6-public/defs.h                             |  190 ++
 xv6-public/dot-bochsrc                        |  738 +++++++
 xv6-public/echo.c                             |   13 +
 xv6-public/elf.h                              |   42 +
 xv6-public/entry.S                            |   68 +
 xv6-public/entryother.S                       |   93 +
 xv6-public/exec.c                             |  114 ++
 xv6-public/fcntl.h                            |    4 +
 xv6-public/file.c                             |  157 ++
 xv6-public/file.h                             |   37 +
 xv6-public/forktest.c                         |   56 +
 xv6-public/fs.c                               |  671 ++++++
 xv6-public/fs.h                               |   57 +
 xv6-public/gdbutil                            |  291 +++
 xv6-public/grep.c                             |  107 +
 xv6-public/ide.c                              |  169 ++
 xv6-public/init.c                             |   37 +
 xv6-public/initcode.S                         |   32 +
 xv6-public/ioapic.c                           |   75 +
 xv6-public/kalloc.c                           |   96 +
 xv6-public/kbd.c                              |   50 +
 xv6-public/kbd.h                              |  112 +
 xv6-public/kernel.ld                          |   68 +
 xv6-public/kill.c                             |   17 +
 xv6-public/lapic.c                            |  229 +++
 xv6-public/ln.c                               |   15 +
 xv6-public/log.c                              |  234 +++
 xv6-public/ls.c                               |   85 +
 xv6-public/main.c                             |  116 ++
 xv6-public/memide.c                           |   60 +
 xv6-public/memlayout.h                        |   15 +
 xv6-public/mkdir.c                            |   23 +
 xv6-public/mkfs.c                             |  297 +++
 xv6-public/mmu.h                              |  181 ++
 xv6-public/mp.c                               |  139 ++
 xv6-public/mp.h                               |   56 +
 xv6-public/param.h                            |   14 +
 xv6-public/picirq.c                           |   19 +
 xv6-public/pipe.c                             |  121 ++
 xv6-public/pr.pl                              |   36 +
 xv6-public/printf.c                           |   85 +
 xv6-public/printpcs                           |   14 +
 xv6-public/proc.c                             |  534 +++++
 xv6-public/proc.h                             |   61 +
 xv6-public/rm.c                               |   23 +
 xv6-public/runoff                             |  246 +++
 xv6-public/runoff.list                        |   80 +
 xv6-public/runoff.spec                        |  102 +
 xv6-public/runoff1                            |  108 +
 xv6-public/sh.c                               |  493 +++++
 xv6-public/show1                              |    3 +
 xv6-public/sign.pl                            |   19 +
 xv6-public/sleep1.p                           |  134 ++
 xv6-public/sleeplock.c                        |   56 +
 xv6-public/sleeplock.h                        |   10 +
 xv6-public/spinlock.c                         |  126 ++
 xv6-public/spinlock.h                         |   11 +
 xv6-public/spinp                              |   16 +
 xv6-public/stat.h                             |   11 +
 xv6-public/stressfs.c                         |   49 +
 xv6-public/string.c                           |  105 +
 xv6-public/swtch.S                            |   29 +
 xv6-public/syscall.c                          |  186 ++
 xv6-public/syscall.h                          |   25 +
 xv6-public/sysfile.c                          |  469 +++++
 xv6-public/sysproc.c                          |  121 ++
 xv6-public/toc.ftr                            |   13 +
 xv6-public/toc.hdr                            |    6 +
 xv6-public/trap.c                             |  148 ++
 xv6-public/trapasm.S                          |   32 +
 xv6-public/traps.h                            |   38 +
 xv6-public/types.h                            |    4 +
 xv6-public/uart.c                             |   77 +
 xv6-public/ulib.c                             |  106 +
 xv6-public/umalloc.c                          |   90 +
 xv6-public/user.h                             |   44 +
 xv6-public/usertests.c                        | 1803 +++++++++++++++++
 xv6-public/usys.S                             |   41 +
 xv6-public/uthread.c                          |  114 ++
 xv6-public/uthread_switch.S                   |   28 +
 xv6-public/vectors.pl                         |   47 +
 xv6-public/vm.c                               |  394 ++++
 xv6-public/wc.c                               |   54 +
 xv6-public/x86.h                              |  183 ++
 .../xv6.si4project/Backup/Makefile(2542)      |  291 +++
 .../xv6.si4project/Backup/Makefile(5214)      |  290 +++
 .../xv6.si4project/Backup/Makefile(7715)      |  296 +++
 .../xv6.si4project/Backup/alarmtest(5755).c   |    1 +
 xv6-public/xv6.si4project/Backup/ide(3563).c  |  168 ++
 xv6-public/xv6.si4project/Backup/proc(1173).h |   58 +
 xv6-public/xv6.si4project/Backup/proc(6211).c |  534 +++++
 .../xv6.si4project/Backup/syscall(2531).h     |   24 +
 .../xv6.si4project/Backup/syscall(3495).c     |  182 ++
 .../xv6.si4project/Backup/sysproc(2335).c     |  101 +
 xv6-public/xv6.si4project/Backup/trap(2304).c |  133 ++
 xv6-public/xv6.si4project/Backup/user(4192).h |   42 +
 xv6-public/xv6.si4project/Backup/usys(6843).S |   33 +
 .../Backup/uthread_switch(3995).S             |   10 +
 .../cache/parse/alarmtest.c.sisc              |  Bin 0 -> 3547 bytes
 .../xv6.si4project/cache/parse/asm.h.sisc     |  Bin 0 -> 1780 bytes
 .../xv6.si4project/cache/parse/bio.c.sisc     |  Bin 0 -> 8866 bytes
 .../cache/parse/bootmain.c.sisc               |  Bin 0 -> 6187 bytes
 .../xv6.si4project/cache/parse/buf.h.sisc     |  Bin 0 -> 2119 bytes
 .../xv6.si4project/cache/parse/cat.c.sisc     |  Bin 0 -> 4932 bytes
 .../xv6.si4project/cache/parse/console.c.sisc |  Bin 0 -> 21876 bytes
 .../xv6.si4project/cache/parse/date.c.sisc    |  Bin 0 -> 3362 bytes
 .../xv6.si4project/cache/parse/date.h.sisc    |  Bin 0 -> 1646 bytes
 .../xv6.si4project/cache/parse/defs.h.sisc    |  Bin 0 -> 78792 bytes
 .../xv6.si4project/cache/parse/echo.c.sisc    |  Bin 0 -> 2254 bytes
 .../xv6.si4project/cache/parse/elf.h.sisc     |  Bin 0 -> 4086 bytes
 .../xv6.si4project/cache/parse/exec.c.sisc    |  Bin 0 -> 5504 bytes
 .../xv6.si4project/cache/parse/fcntl.h.sisc   |  Bin 0 -> 1202 bytes
 .../xv6.si4project/cache/parse/file.c.sisc    |  Bin 0 -> 11485 bytes
 .../xv6.si4project/cache/parse/file.h.sisc    |  Bin 0 -> 4327 bytes
 .../cache/parse/forktest.c.sisc               |  Bin 0 -> 4616 bytes
 .../xv6.si4project/cache/parse/fs.c.sisc      |  Bin 0 -> 44413 bytes
 .../xv6.si4project/cache/parse/fs.h.sisc      |  Bin 0 -> 4736 bytes
 .../xv6.si4project/cache/parse/grep.c.sisc    |  Bin 0 -> 13180 bytes
 .../xv6.si4project/cache/parse/ide.c.sisc     |  Bin 0 -> 11055 bytes
 .../xv6.si4project/cache/parse/init.c.sisc    |  Bin 0 -> 3043 bytes
 .../xv6.si4project/cache/parse/ioapic.c.sisc  |  Bin 0 -> 6365 bytes
 .../xv6.si4project/cache/parse/kalloc.c.sisc  |  Bin 0 -> 8389 bytes
 .../xv6.si4project/cache/parse/kbd.c.sisc     |  Bin 0 -> 3629 bytes
 .../xv6.si4project/cache/parse/kbd.h.sisc     |  Bin 0 -> 3969 bytes
 .../xv6.si4project/cache/parse/kill.c.sisc    |  Bin 0 -> 2532 bytes
 .../xv6.si4project/cache/parse/lapic.c.sisc   |  Bin 0 -> 13737 bytes
 .../xv6.si4project/cache/parse/ln.c.sisc      |  Bin 0 -> 2439 bytes
 .../xv6.si4project/cache/parse/log.c.sisc     |  Bin 0 -> 13545 bytes
 .../xv6.si4project/cache/parse/ls.c.sisc      |  Bin 0 -> 6735 bytes
 .../xv6.si4project/cache/parse/main.c.sisc    |  Bin 0 -> 5180 bytes
 .../xv6.si4project/cache/parse/memide.c.sisc  |  Bin 0 -> 4293 bytes
 .../cache/parse/memlayout.h.sisc              |  Bin 0 -> 2632 bytes
 .../xv6.si4project/cache/parse/mkdir.c.sisc   |  Bin 0 -> 3099 bytes
 .../xv6.si4project/cache/parse/mkfs.c.sisc    |  Bin 0 -> 26526 bytes
 .../xv6.si4project/cache/parse/mmu.h.sisc     |  Bin 0 -> 14989 bytes
 .../xv6.si4project/cache/parse/mp.c.sisc      |  Bin 0 -> 9578 bytes
 .../xv6.si4project/cache/parse/mp.h.sisc      |  Bin 0 -> 5563 bytes
 .../xv6.si4project/cache/parse/param.h.sisc   |  Bin 0 -> 2058 bytes
 .../xv6.si4project/cache/parse/picirq.c.sisc  |  Bin 0 -> 1729 bytes
 .../xv6.si4project/cache/parse/pipe.c.sisc    |  Bin 0 -> 10556 bytes
 .../xv6.si4project/cache/parse/printf.c.sisc  |  Bin 0 -> 9903 bytes
 .../xv6.si4project/cache/parse/proc.c.sisc    |  Bin 0 -> 25493 bytes
 .../xv6.si4project/cache/parse/proc.h.sisc    |  Bin 0 -> 6820 bytes
 .../xv6.si4project/cache/parse/rm.c.sisc      |  Bin 0 -> 3100 bytes
 .../xv6.si4project/cache/parse/sh.c.sisc      |  Bin 0 -> 40514 bytes
 .../cache/parse/sleeplock.c.sisc              |  Bin 0 -> 5376 bytes
 .../cache/parse/sleeplock.h.sisc              |  Bin 0 -> 1473 bytes
 .../cache/parse/spinlock.c.sisc               |  Bin 0 -> 7492 bytes
 .../cache/parse/spinlock.h.sisc               |  Bin 0 -> 1477 bytes
 .../xv6.si4project/cache/parse/stat.h.sisc    |  Bin 0 -> 1832 bytes
 .../cache/parse/stressfs.c.sisc               |  Bin 0 -> 2864 bytes
 .../xv6.si4project/cache/parse/string.c.sisc  |  Bin 0 -> 12754 bytes
 .../xv6.si4project/cache/parse/syscall.c.sisc |  Bin 0 -> 17711 bytes
 .../xv6.si4project/cache/parse/syscall.h.sisc |  Bin 0 -> 3165 bytes
 .../xv6.si4project/cache/parse/sysfile.c.sisc |  Bin 0 -> 27340 bytes
 .../xv6.si4project/cache/parse/sysproc.c.sisc |  Bin 0 -> 7100 bytes
 .../xv6.si4project/cache/parse/trap.c.sisc    |  Bin 0 -> 9110 bytes
 .../xv6.si4project/cache/parse/traps.h.sisc   |  Bin 0 -> 3465 bytes
 .../xv6.si4project/cache/parse/types.h.sisc   |  Bin 0 -> 1192 bytes
 .../xv6.si4project/cache/parse/uart.c.sisc    |  Bin 0 -> 4314 bytes
 .../xv6.si4project/cache/parse/ulib.c.sisc    |  Bin 0 -> 11830 bytes
 .../xv6.si4project/cache/parse/umalloc.c.sisc |  Bin 0 -> 7326 bytes
 .../xv6.si4project/cache/parse/user.h.sisc    |  Bin 0 -> 23483 bytes
 .../cache/parse/usertests.c.sisc              |  Bin 0 -> 103752 bytes
 .../xv6.si4project/cache/parse/uthread.c.sisc |  Bin 0 -> 8852 bytes
 .../xv6.si4project/cache/parse/vm.c.sisc      |  Bin 0 -> 33227 bytes
 .../xv6.si4project/cache/parse/wc.c.sisc      |  Bin 0 -> 5994 bytes
 .../xv6.si4project/cache/parse/x86.h.sisc     |  Bin 0 -> 18937 bytes
 .../xv6.si4project/cache/parse/zombie.c.sisc  |  Bin 0 -> 1521 bytes
 xv6-public/xv6.si4project/xv6.SearchResults   |    4 +
 xv6-public/xv6.si4project/xv6.bookmarks.xml   |    7 +
 xv6-public/xv6.si4project/xv6.sip_sym         |  Bin 0 -> 987452 bytes
 xv6-public/xv6.si4project/xv6.sip_xab         |  Bin 0 -> 32768 bytes
 xv6-public/xv6.si4project/xv6.sip_xad         |  Bin 0 -> 648 bytes
 xv6-public/xv6.si4project/xv6.sip_xc          |  Bin 0 -> 196840 bytes
 xv6-public/xv6.si4project/xv6.sip_xf          |  Bin 0 -> 196840 bytes
 xv6-public/xv6.si4project/xv6.sip_xm          |  Bin 0 -> 388 bytes
 xv6-public/xv6.si4project/xv6.sip_xr          |  Bin 0 -> 196840 bytes
 xv6-public/xv6.si4project/xv6.sip_xsb         |  Bin 0 -> 126976 bytes
 xv6-public/xv6.si4project/xv6.sip_xsd         |  Bin 0 -> 1568 bytes
 xv6-public/xv6.si4project/xv6.siproj          |  Bin 0 -> 32328 bytes
 .../xv6.si4project/xv6.siproj_settings.xml    |   22 +
 xv6-public/xv6.si4project/xv6.siwork          |  Bin 0 -> 65716 bytes
 xv6-public/xv6.si4project/xv6.snippets.xml    |    7 +
 xv6-public/zombie.c                           |   14 +
 206 files changed, 14995 insertions(+)
 create mode 100644 xv6-public/.cvsignore
 create mode 100644 xv6-public/.dir-locals.el
 create mode 100644 xv6-public/.gdbinit.tmpl
 create mode 100644 xv6-public/.gitignore
 create mode 100644 xv6-public/BUGS
 create mode 100644 xv6-public/LICENSE
 create mode 100644 xv6-public/Makefile
 create mode 100644 xv6-public/Notes
 create mode 100644 xv6-public/README
 create mode 100644 xv6-public/TRICKS
 create mode 100644 xv6-public/alarmtest.c
 create mode 100644 xv6-public/asm.h
 create mode 100644 xv6-public/bio.c
 create mode 100644 xv6-public/bootasm.S
 create mode 100644 xv6-public/bootmain.c
 create mode 100644 xv6-public/buf.h
 create mode 100644 xv6-public/cat.c
 create mode 100644 xv6-public/console.c
 create mode 100644 xv6-public/cuth
 create mode 100644 xv6-public/date.c
 create mode 100644 xv6-public/date.h
 create mode 100644 xv6-public/defs.h
 create mode 100644 xv6-public/dot-bochsrc
 create mode 100644 xv6-public/echo.c
 create mode 100644 xv6-public/elf.h
 create mode 100644 xv6-public/entry.S
 create mode 100644 xv6-public/entryother.S
 create mode 100644 xv6-public/exec.c
 create mode 100644 xv6-public/fcntl.h
 create mode 100644 xv6-public/file.c
 create mode 100644 xv6-public/file.h
 create mode 100644 xv6-public/forktest.c
 create mode 100644 xv6-public/fs.c
 create mode 100644 xv6-public/fs.h
 create mode 100644 xv6-public/gdbutil
 create mode 100644 xv6-public/grep.c
 create mode 100644 xv6-public/ide.c
 create mode 100644 xv6-public/init.c
 create mode 100644 xv6-public/initcode.S
 create mode 100644 xv6-public/ioapic.c
 create mode 100644 xv6-public/kalloc.c
 create mode 100644 xv6-public/kbd.c
 create mode 100644 xv6-public/kbd.h
 create mode 100644 xv6-public/kernel.ld
 create mode 100644 xv6-public/kill.c
 create mode 100644 xv6-public/lapic.c
 create mode 100644 xv6-public/ln.c
 create mode 100644 xv6-public/log.c
 create mode 100644 xv6-public/ls.c
 create mode 100644 xv6-public/main.c
 create mode 100644 xv6-public/memide.c
 create mode 100644 xv6-public/memlayout.h
 create mode 100644 xv6-public/mkdir.c
 create mode 100644 xv6-public/mkfs.c
 create mode 100644 xv6-public/mmu.h
 create mode 100644 xv6-public/mp.c
 create mode 100644 xv6-public/mp.h
 create mode 100644 xv6-public/param.h
 create mode 100644 xv6-public/picirq.c
 create mode 100644 xv6-public/pipe.c
 create mode 100644 xv6-public/pr.pl
 create mode 100644 xv6-public/printf.c
 create mode 100644 xv6-public/printpcs
 create mode 100644 xv6-public/proc.c
 create mode 100644 xv6-public/proc.h
 create mode 100644 xv6-public/rm.c
 create mode 100644 xv6-public/runoff
 create mode 100644 xv6-public/runoff.list
 create mode 100644 xv6-public/runoff.spec
 create mode 100644 xv6-public/runoff1
 create mode 100644 xv6-public/sh.c
 create mode 100644 xv6-public/show1
 create mode 100644 xv6-public/sign.pl
 create mode 100644 xv6-public/sleep1.p
 create mode 100644 xv6-public/sleeplock.c
 create mode 100644 xv6-public/sleeplock.h
 create mode 100644 xv6-public/spinlock.c
 create mode 100644 xv6-public/spinlock.h
 create mode 100644 xv6-public/spinp
 create mode 100644 xv6-public/stat.h
 create mode 100644 xv6-public/stressfs.c
 create mode 100644 xv6-public/string.c
 create mode 100644 xv6-public/swtch.S
 create mode 100644 xv6-public/syscall.c
 create mode 100644 xv6-public/syscall.h
 create mode 100644 xv6-public/sysfile.c
 create mode 100644 xv6-public/sysproc.c
 create mode 100644 xv6-public/toc.ftr
 create mode 100644 xv6-public/toc.hdr
 create mode 100644 xv6-public/trap.c
 create mode 100644 xv6-public/trapasm.S
 create mode 100644 xv6-public/traps.h
 create mode 100644 xv6-public/types.h
 create mode 100644 xv6-public/uart.c
 create mode 100644 xv6-public/ulib.c
 create mode 100644 xv6-public/umalloc.c
 create mode 100644 xv6-public/user.h
 create mode 100644 xv6-public/usertests.c
 create mode 100644 xv6-public/usys.S
 create mode 100644 xv6-public/uthread.c
 create mode 100644 xv6-public/uthread_switch.S
 create mode 100644 xv6-public/vectors.pl
 create mode 100644 xv6-public/vm.c
 create mode 100644 xv6-public/wc.c
 create mode 100644 xv6-public/x86.h
 create mode 100644 xv6-public/xv6.si4project/Backup/Makefile(2542)
 create mode 100644 xv6-public/xv6.si4project/Backup/Makefile(5214)
 create mode 100644 xv6-public/xv6.si4project/Backup/Makefile(7715)
 create mode 100644 xv6-public/xv6.si4project/Backup/alarmtest(5755).c
 create mode 100644 xv6-public/xv6.si4project/Backup/ide(3563).c
 create mode 100644 xv6-public/xv6.si4project/Backup/proc(1173).h
 create mode 100644 xv6-public/xv6.si4project/Backup/proc(6211).c
 create mode 100644 xv6-public/xv6.si4project/Backup/syscall(2531).h
 create mode 100644 xv6-public/xv6.si4project/Backup/syscall(3495).c
 create mode 100644 xv6-public/xv6.si4project/Backup/sysproc(2335).c
 create mode 100644 xv6-public/xv6.si4project/Backup/trap(2304).c
 create mode 100644 xv6-public/xv6.si4project/Backup/user(4192).h
 create mode 100644 xv6-public/xv6.si4project/Backup/usys(6843).S
 create mode 100644 xv6-public/xv6.si4project/Backup/uthread_switch(3995).S
 create mode 100644 xv6-public/xv6.si4project/cache/parse/alarmtest.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/asm.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/bio.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/bootmain.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/buf.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/cat.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/console.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/date.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/date.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/defs.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/echo.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/elf.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/exec.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/fcntl.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/file.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/file.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/forktest.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/fs.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/fs.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/grep.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/ide.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/init.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/ioapic.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/kalloc.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/kbd.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/kbd.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/kill.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/lapic.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/ln.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/log.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/ls.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/main.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/memide.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/memlayout.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/mkdir.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/mkfs.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/mmu.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/mp.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/mp.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/param.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/picirq.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/pipe.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/printf.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/proc.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/proc.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/rm.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/sh.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/sleeplock.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/sleeplock.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/spinlock.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/spinlock.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/stat.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/stressfs.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/string.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/syscall.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/syscall.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/sysfile.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/sysproc.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/trap.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/traps.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/types.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/uart.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/ulib.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/umalloc.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/user.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/usertests.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/uthread.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/vm.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/wc.c.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/x86.h.sisc
 create mode 100644 xv6-public/xv6.si4project/cache/parse/zombie.c.sisc
 create mode 100644 xv6-public/xv6.si4project/xv6.SearchResults
 create mode 100644 xv6-public/xv6.si4project/xv6.bookmarks.xml
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_sym
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_xab
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_xad
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_xc
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_xf
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_xm
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_xr
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_xsb
 create mode 100644 xv6-public/xv6.si4project/xv6.sip_xsd
 create mode 100644 xv6-public/xv6.si4project/xv6.siproj
 create mode 100644 xv6-public/xv6.si4project/xv6.siproj_settings.xml
 create mode 100644 xv6-public/xv6.si4project/xv6.siwork
 create mode 100644 xv6-public/xv6.si4project/xv6.snippets.xml
 create mode 100644 xv6-public/zombie.c

diff --git a/xv6-public/.cvsignore b/xv6-public/.cvsignore
new file mode 100644
index 0000000..081a43c
--- /dev/null
+++ b/xv6-public/.cvsignore
@@ -0,0 +1,16 @@
+*.asm
+*.d
+*.sym
+_*
+kernel
+user1
+userfs
+usertests
+xv6.img
+vectors.S
+bochsout.txt
+bootblock
+bootother
+bootother.out
+parport.out
+fmt
diff --git a/xv6-public/.dir-locals.el b/xv6-public/.dir-locals.el
new file mode 100644
index 0000000..da72247
--- /dev/null
+++ b/xv6-public/.dir-locals.el
@@ -0,0 +1,4 @@
+((c-mode
+  (indent-tabs-mode . nil)
+  (c-file-style . "bsd")
+  (c-basic-offset . 2)))
diff --git a/xv6-public/.gdbinit.tmpl b/xv6-public/.gdbinit.tmpl
new file mode 100644
index 0000000..f71681a
--- /dev/null
+++ b/xv6-public/.gdbinit.tmpl
@@ -0,0 +1,27 @@
+set $lastcs = -1
+
+define hook-stop
+  # There doesn't seem to be a good way to detect if we're in 16- or
+  # 32-bit mode, but in 32-bit mode we always run with CS == 8 in the
+  # kernel and CS == 35 in user space
+  if $cs == 8 || $cs == 35
+    if $lastcs != 8 && $lastcs != 35
+      set architecture i386
+    end
+    x/i $pc
+  else
+    if $lastcs == -1 || $lastcs == 8 || $lastcs == 35
+      set architecture i8086
+    end
+    # Translate the segment:offset into a physical address
+    printf "[%4x:%4x] ", $cs, $eip
+    x/i $cs*16+$eip
+  end
+  set $lastcs = $cs
+end
+
+echo + target remote localhost:1234\n
+target remote localhost:1234
+
+echo + symbol-file kernel\n
+symbol-file kernel
diff --git a/xv6-public/.gitignore b/xv6-public/.gitignore
new file mode 100644
index 0000000..3e2c9de
--- /dev/null
+++ b/xv6-public/.gitignore
@@ -0,0 +1,16 @@
+*~
+_*
+*.o
+*.d
+*.asm
+*.sym
+*.img
+vectors.S
+bootblock
+entryother
+initcode
+initcode.out
+kernel
+kernelmemfs
+mkfs
+.gdbinit
diff --git a/xv6-public/BUGS b/xv6-public/BUGS
new file mode 100644
index 0000000..81d2220
--- /dev/null
+++ b/xv6-public/BUGS
@@ -0,0 +1,7 @@
+formatting:
+	need to fix PAGEBREAK mechanism
+
+sh:
+	can't always runcmd in child -- breaks cd.
+	maybe should hard-code PATH=/ ?
+
diff --git a/xv6-public/LICENSE b/xv6-public/LICENSE
new file mode 100644
index 0000000..422c0cc
--- /dev/null
+++ b/xv6-public/LICENSE
@@ -0,0 +1,24 @@
+The xv6 software is:
+
+Copyright (c) 2006-2018 Frans Kaashoek, Robert Morris, Russ Cox,
+                        Massachusetts Institute of Technology
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
diff --git a/xv6-public/Makefile b/xv6-public/Makefile
new file mode 100644
index 0000000..346f45c
--- /dev/null
+++ b/xv6-public/Makefile
@@ -0,0 +1,296 @@
+OBJS = \
+	bio.o\
+	console.o\
+	exec.o\
+	file.o\
+	fs.o\
+	ide.o\
+	ioapic.o\
+	kalloc.o\
+	kbd.o\
+	lapic.o\
+	log.o\
+	main.o\
+	mp.o\
+	picirq.o\
+	pipe.o\
+	proc.o\
+	sleeplock.o\
+	spinlock.o\
+	string.o\
+	swtch.o\
+	syscall.o\
+	sysfile.o\
+	sysproc.o\
+	trapasm.o\
+	trap.o\
+	uart.o\
+	vectors.o\
+	vm.o\
+
+# Cross-compiling (e.g., on Mac OS X)
+# TOOLPREFIX = i386-jos-elf
+
+# Using native tools (e.g., on X86 Linux)
+#TOOLPREFIX = 
+
+# Try to infer the correct TOOLPREFIX if not set
+ifndef TOOLPREFIX
+TOOLPREFIX := $(shell if i386-jos-elf-objdump -i 2>&1 | grep '^elf32-i386$$' >/dev/null 2>&1; \
+	then echo 'i386-jos-elf-'; \
+	elif objdump -i 2>&1 | grep 'elf32-i386' >/dev/null 2>&1; \
+	then echo ''; \
+	else echo "***" 1>&2; \
+	echo "*** Error: Couldn't find an i386-*-elf version of GCC/binutils." 1>&2; \
+	echo "*** Is the directory with i386-jos-elf-gcc in your PATH?" 1>&2; \
+	echo "*** If your i386-*-elf toolchain is installed with a command" 1>&2; \
+	echo "*** prefix other than 'i386-jos-elf-', set your TOOLPREFIX" 1>&2; \
+	echo "*** environment variable to that prefix and run 'make' again." 1>&2; \
+	echo "*** To turn off this error, run 'gmake TOOLPREFIX= ...'." 1>&2; \
+	echo "***" 1>&2; exit 1; fi)
+endif
+
+# If the makefile can't find QEMU, specify its path here
+# QEMU = qemu-system-i386
+
+# Try to infer the correct QEMU
+ifndef QEMU
+QEMU = $(shell if which qemu > /dev/null; \
+	then echo qemu; exit; \
+	elif which qemu-system-i386 > /dev/null; \
+	then echo qemu-system-i386; exit; \
+	elif which qemu-system-x86_64 > /dev/null; \
+	then echo qemu-system-x86_64; exit; \
+	else \
+	qemu=/Applications/Q.app/Contents/MacOS/i386-softmmu.app/Contents/MacOS/i386-softmmu; \
+	if test -x $$qemu; then echo $$qemu; exit; fi; fi; \
+	echo "***" 1>&2; \
+	echo "*** Error: Couldn't find a working QEMU executable." 1>&2; \
+	echo "*** Is the directory containing the qemu binary in your PATH" 1>&2; \
+	echo "*** or have you tried setting the QEMU variable in Makefile?" 1>&2; \
+	echo "***" 1>&2; exit 1)
+endif
+
+CC = $(TOOLPREFIX)gcc
+AS = $(TOOLPREFIX)gas
+LD = $(TOOLPREFIX)ld
+OBJCOPY = $(TOOLPREFIX)objcopy
+OBJDUMP = $(TOOLPREFIX)objdump
+CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -O2 -Wall -MD -ggdb -m32 -Werror -fno-omit-frame-pointer
+CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
+ASFLAGS = -m32 -gdwarf-2 -Wa,-divide
+# FreeBSD ld wants ``elf_i386_fbsd''
+LDFLAGS += -m $(shell $(LD) -V | grep elf_i386 2>/dev/null | head -n 1)
+
+# Disable PIE when possible (for Ubuntu 16.10 toolchain)
+ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]no-pie'),)
+CFLAGS += -fno-pie -no-pie
+endif
+ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]nopie'),)
+CFLAGS += -fno-pie -nopie
+endif
+
+xv6.img: bootblock kernel
+	dd if=/dev/zero of=xv6.img count=10000
+	dd if=bootblock of=xv6.img conv=notrunc
+	dd if=kernel of=xv6.img seek=1 conv=notrunc
+
+xv6memfs.img: bootblock kernelmemfs
+	dd if=/dev/zero of=xv6memfs.img count=10000
+	dd if=bootblock of=xv6memfs.img conv=notrunc
+	dd if=kernelmemfs of=xv6memfs.img seek=1 conv=notrunc
+
+bootblock: bootasm.S bootmain.c
+	$(CC) $(CFLAGS) -fno-pic -O -nostdinc -I. -c bootmain.c
+	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c bootasm.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0x7C00 -o bootblock.o bootasm.o bootmain.o
+	$(OBJDUMP) -S bootblock.o > bootblock.asm
+	$(OBJCOPY) -S -O binary -j .text bootblock.o bootblock
+	./sign.pl bootblock
+
+entryother: entryother.S
+	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c entryother.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0x7000 -o bootblockother.o entryother.o
+	$(OBJCOPY) -S -O binary -j .text bootblockother.o entryother
+	$(OBJDUMP) -S bootblockother.o > entryother.asm
+
+initcode: initcode.S
+	$(CC) $(CFLAGS) -nostdinc -I. -c initcode.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0 -o initcode.out initcode.o
+	$(OBJCOPY) -S -O binary initcode.out initcode
+	$(OBJDUMP) -S initcode.o > initcode.asm
+
+kernel: $(OBJS) entry.o entryother initcode kernel.ld
+	$(LD) $(LDFLAGS) -T kernel.ld -o kernel entry.o $(OBJS) -b binary initcode entryother
+	$(OBJDUMP) -S kernel > kernel.asm
+	$(OBJDUMP) -t kernel | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
+
+_uthread: uthread.o uthread_switch.o
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o _uthread uthread.o uthread_switch.o $(ULIB)
+	$(OBJDUMP) -S _uthread > uthread.asm
+
+# kernelmemfs is a copy of kernel that maintains the
+# disk image in memory instead of writing to a disk.
+# This is not so useful for testing persistent storage or
+# exploring disk buffering implementations, but it is
+# great for testing the kernel on real hardware without
+# needing a scratch disk.
+MEMFSOBJS = $(filter-out ide.o,$(OBJS)) memide.o
+kernelmemfs: $(MEMFSOBJS) entry.o entryother initcode kernel.ld fs.img
+	$(LD) $(LDFLAGS) -T kernel.ld -o kernelmemfs entry.o  $(MEMFSOBJS) -b binary initcode entryother fs.img
+	$(OBJDUMP) -S kernelmemfs > kernelmemfs.asm
+	$(OBJDUMP) -t kernelmemfs | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernelmemfs.sym
+
+tags: $(OBJS) entryother.S _init
+	etags *.S *.c
+
+vectors.S: vectors.pl
+	./vectors.pl > vectors.S
+
+ULIB = ulib.o usys.o printf.o umalloc.o
+
+_%: %.o $(ULIB)
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o $@ $^
+	$(OBJDUMP) -S $@ > $*.asm
+	$(OBJDUMP) -t $@ | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $*.sym
+
+_forktest: forktest.o $(ULIB)
+	# forktest has less library code linked in - needs to be small
+	# in order to be able to max out the proc table.
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o _forktest forktest.o ulib.o usys.o
+	$(OBJDUMP) -S _forktest > forktest.asm
+
+mkfs: mkfs.c fs.h
+	gcc -Werror -Wall -o mkfs mkfs.c
+
+# Prevent deletion of intermediate files, e.g. cat.o, after first build, so
+# that disk image changes after first build are persistent until clean.  More
+# details:
+# http://www.gnu.org/software/make/manual/html_node/Chained-Rules.html
+.PRECIOUS: %.o
+
+UPROGS=\
+	_cat\
+	_echo\
+	_forktest\
+	_grep\
+	_init\
+	_kill\
+	_ln\
+	_ls\
+	_mkdir\
+	_rm\
+	_sh\
+	_stressfs\
+	_usertests\
+	_wc\
+	_zombie\
+	_date\
+	_alarmtest\
+	_uthread\
+
+fs.img: mkfs README $(UPROGS)
+	./mkfs fs.img README $(UPROGS)
+
+-include *.d
+
+clean: 
+	rm -f *.tex *.dvi *.idx *.aux *.log *.ind *.ilg \
+	*.o *.d *.asm *.sym vectors.S bootblock entryother \
+	initcode initcode.out kernel xv6.img fs.img kernelmemfs \
+	xv6memfs.img mkfs .gdbinit \
+	$(UPROGS)
+
+# make a printout
+FILES = $(shell grep -v '^\#' runoff.list)
+PRINT = runoff.list runoff.spec README toc.hdr toc.ftr $(FILES)
+
+xv6.pdf: $(PRINT)
+	./runoff
+	ls -l xv6.pdf
+
+print: xv6.pdf
+
+# run in emulators
+
+bochs : fs.img xv6.img
+	if [ ! -e .bochsrc ]; then ln -s dot-bochsrc .bochsrc; fi
+	bochs -q
+
+# try to generate a unique GDB port
+GDBPORT = $(shell expr `id -u` % 5000 + 25000)
+# QEMU's gdb stub command line changed in 0.11
+QEMUGDB = $(shell if $(QEMU) -help | grep -q '^-gdb'; \
+	then echo "-gdb tcp::$(GDBPORT)"; \
+	else echo "-s -p $(GDBPORT)"; fi)
+ifndef CPUS
+CPUS := 2
+endif
+QEMUOPTS = -drive file=fs.img,index=1,media=disk,format=raw -drive file=xv6.img,index=0,media=disk,format=raw -smp $(CPUS) -m 512 $(QEMUEXTRA)
+
+gdb:
+	gdb -x .gdbinit
+	
+qemu: fs.img xv6.img
+	$(QEMU) -serial mon:stdio $(QEMUOPTS)
+
+qemu-memfs: xv6memfs.img
+	$(QEMU) -drive file=xv6memfs.img,index=0,media=disk,format=raw -smp $(CPUS) -m 256
+
+qemu-nox: fs.img xv6.img
+	$(QEMU) -nographic $(QEMUOPTS)
+
+.gdbinit: .gdbinit.tmpl
+	sed "s/localhost:1234/localhost:$(GDBPORT)/" < $^ > $@
+
+qemu-gdb: fs.img xv6.img .gdbinit
+	@echo "*** Now run 'gdb'." 1>&2
+	$(QEMU) -serial mon:stdio $(QEMUOPTS) -S $(QEMUGDB)
+
+qemu-nox-gdb: fs.img xv6.img .gdbinit
+	@echo "*** Now run 'gdb'." 1>&2
+	$(QEMU) -nographic $(QEMUOPTS) -S $(QEMUGDB)
+
+# CUT HERE
+# prepare dist for students
+# after running make dist, probably want to
+# rename it to rev0 or rev1 or so on and then
+# check in that version.
+
+EXTRA=\
+	mkfs.c ulib.c user.h cat.c echo.c forktest.c grep.c kill.c\
+	ln.c ls.c mkdir.c rm.c stressfs.c usertests.c wc.c zombie.c\
+	printf.c umalloc.c\
+	README dot-bochsrc *.pl toc.* runoff runoff1 runoff.list\
+	.gdbinit.tmpl gdbutil\
+
+dist:
+	rm -rf dist
+	mkdir dist
+	for i in $(FILES); \
+	do \
+		grep -v PAGEBREAK $$i >dist/$$i; \
+	done
+	sed '/CUT HERE/,$$d' Makefile >dist/Makefile
+	echo >dist/runoff.spec
+	cp $(EXTRA) dist
+
+dist-test:
+	rm -rf dist
+	make dist
+	rm -rf dist-test
+	mkdir dist-test
+	cp dist/* dist-test
+	cd dist-test; $(MAKE) print
+	cd dist-test; $(MAKE) bochs || true
+	cd dist-test; $(MAKE) qemu
+
+# update this rule (change rev#) when it is time to
+# make a new revision.
+tar:
+	rm -rf /tmp/xv6
+	mkdir -p /tmp/xv6
+	cp dist/* dist/.gdbinit.tmpl /tmp/xv6
+	(cd /tmp; tar cf - xv6) | gzip >xv6-rev10.tar.gz  # the next one will be 10 (9/17)
+
+.PHONY: dist-test dist
diff --git a/xv6-public/Notes b/xv6-public/Notes
new file mode 100644
index 0000000..74c8aea
--- /dev/null
+++ b/xv6-public/Notes
@@ -0,0 +1,123 @@
+bochs 2.2.6:
+./configure --enable-smp --enable-disasm --enable-debugger --enable-all-optimizations --enable-4meg-pages --enable-global-pages --enable-pae --disable-reset-on-triple-fault
+bochs CVS after 2.2.6:
+./configure --enable-smp --enable-disasm --enable-debugger --enable-all-optimizations --enable-4meg-pages --enable-global-pages --enable-pae 
+
+bootmain.c doesn't work right if the ELF sections aren't
+sector-aligned. so you can't use ld -N. and the sections may also need
+to be non-zero length, only really matters for tiny "kernels".
+
+kernel loaded at 1 megabyte. stack same place that bootasm.S left it.
+
+kinit() should find real mem size
+  and rescue useable memory below 1 meg
+
+no paging, no use of page table hardware, just segments
+
+no user area: no magic kernel stack mapping
+  so no copying of kernel stack during fork
+  though there is a kernel stack page for each process
+
+no kernel malloc(), just kalloc() for user core
+
+user pointers aren't valid in the kernel
+
+are interrupts turned on in the kernel? yes.
+
+pass curproc explicitly, or implicit from cpu #?
+  e.g. argument to newproc()?
+  hmm, you need a global curproc[cpu] for trap() &c
+
+no stack expansion
+
+test running out of memory, process slots
+
+we can't really use a separate stack segment, since stack addresses
+need to work correctly as ordinary pointers. the same may be true of
+data vs text. how can we have a gap between data and stack, so that
+both can grow, without committing 4GB of physical memory? does this
+mean we need paging?
+
+perhaps have fixed-size stack, put it in the data segment?
+
+oops, if kernel stack is in contiguous user phys mem, then moving
+users' memory (e.g. to expand it) will wreck any pointers into the
+kernel stack.
+
+do we need to set fs and gs? so user processes can't abuse them?
+
+setupsegs() may modify current segment table, is that legal?
+
+trap() ought to lgdt on return, since currently only done in swtch()
+
+protect hardware interrupt vectors from user INT instructions?
+
+test out-of-fd cases for creating pipe.
+test pipe reader closes then write
+test two readers, two writers.
+test children being inherited by grandparent &c
+
+some sleep()s should be interruptible by kill()
+
+locks
+  init_lock
+    sequences CPU startup
+  proc_table_lock
+    also protects next_pid
+  per-fd lock *just* protects count read-modify-write
+    also maybe freeness?
+  memory allocator
+  printf
+
+in general, the table locks protect both free-ness and
+  public variables of table elements
+  in many cases you can use table elements w/o a lock
+  e.g. if you are the process, or you are using an fd
+
+lock order
+  per-pipe lock
+  proc_table_lock fd_table_lock kalloc_lock
+  console_lock
+
+do you have to be holding the mutex in order to call wakeup()? yes
+
+device interrupts don't clear FL_IF
+  so a recursive timer interrupt is possible
+
+what does inode->busy mean?
+  might be held across disk reads
+  no-one is allowed to do anything to the inode
+  protected by inode_table_lock
+inode->count counts in-memory pointers to the struct
+  prevents inode[] element from being re-used
+  protected by inode_table_lock
+
+blocks and inodes have ad-hoc sleep-locks
+  provide a single mechanism?
+
+kalloc() can return 0; do callers handle this right?
+
+test: one process unlinks a file while another links to it
+test: one process opens a file while another deletes it
+test: deadlock d/.. vs ../d, two processes.
+test: dup() shared fd->off
+test: does echo foo > x truncate x?
+
+sh: ioredirection incorrect now we have pipes
+sh: chain of pipes won't work, also ugly that parent closes fdarray entries too
+sh: dynamic memory allocation?
+sh: should sh support ; () &
+sh: stop stdin on ctrl-d (for cat > y)
+
+really should have bdwrite() for file content
+  and make some inode updates async
+  so soft updates make sense
+
+disk scheduling
+echo foo > bar should truncate bar
+  so O_CREATE should not truncate
+  but O_TRUNC should
+
+make it work on a real machine
+release before acquire at end of sleep?
+check 2nd disk (i.e. if not in .bochsrc)
diff --git a/xv6-public/README b/xv6-public/README
new file mode 100644
index 0000000..9e3cf19
--- /dev/null
+++ b/xv6-public/README
@@ -0,0 +1,50 @@
+xv6 is a re-implementation of Dennis Ritchie's and Ken Thompson's Unix
+Version 6 (v6).  xv6 loosely follows the structure and style of v6,
+but is implemented for a modern x86-based multiprocessor using ANSI C.
+
+ACKNOWLEDGMENTS
+
+xv6 is inspired by John Lions's Commentary on UNIX 6th Edition (Peer
+to Peer Communications; ISBN: 1-57398-013-7; 1st edition (June 14,
+2000)). See also https://pdos.csail.mit.edu/6.828/, which
+provides pointers to on-line resources for v6.
+
+xv6 borrows code from the following sources:
+    JOS (asm.h, elf.h, mmu.h, bootasm.S, ide.c, console.c, and others)
+    Plan 9 (entryother.S, mp.h, mp.c, lapic.c)
+    FreeBSD (ioapic.c)
+    NetBSD (console.c)
+
+The following people have made contributions: Russ Cox (context switching,
+locking), Cliff Frey (MP), Xiao Yu (MP), Nickolai Zeldovich, and Austin
+Clements.
+
+We are also grateful for the bug reports and patches contributed by Silas
+Boyd-Wickizer, Anton Burtsev, Cody Cutler, Mike CAT, Tej Chajed, eyalz800,
+Nelson Elhage, Saar Ettinger, Alice Ferrazzi, Nathaniel Filardo, Peter
+Froehlich, Yakir Goaron,Shivam Handa, Bryan Henry, Jim Huang, Alexander
+Kapshuk, Anders Kaseorg, kehao95, Wolfgang Keller, Eddie Kohler, Austin
+Liew, Imbar Marinescu, Yandong Mao, Matan Shabtay, Hitoshi Mitake, Carmi
+Merimovich, Mark Morrissey, mtasm, Joel Nider, Greg Price, Ayan Shafqat,
+Eldar Sehayek, Yongming Shen, Cam Tenny, tyfkda, Rafael Ubal, Warren
+Toomey, Stephen Tu, Pablo Ventura, Xi Wang, Keiichi Watanabe, Nicolas
+Wolovick, wxdao, Grant Wu, Jindong Zhang, Icenowy Zheng, and Zou Chang Wei.
+
+The code in the files that constitute xv6 is
+Copyright 2006-2018 Frans Kaashoek, Robert Morris, and Russ Cox.
+
+ERROR REPORTS
+
+Please send errors and suggestions to Frans Kaashoek and Robert Morris
+(kaashoek,rtm@mit.edu). The main purpose of xv6 is as a teaching
+operating system for MIT's 6.828, so we are more interested in
+simplifications and clarifications than new features.
+
+BUILDING AND RUNNING XV6
+
+To build xv6 on an x86 ELF machine (like Linux or FreeBSD), run
+"make". On non-x86 or non-ELF machines (like OS X, even on x86), you
+will need to install a cross-compiler gcc suite capable of producing
+x86 ELF binaries (see https://pdos.csail.mit.edu/6.828/).
+Then run "make TOOLPREFIX=i386-jos-elf-". Now install the QEMU PC
+simulator and run "make qemu".
diff --git a/xv6-public/TRICKS b/xv6-public/TRICKS
new file mode 100644
index 0000000..8d1439f
--- /dev/null
+++ b/xv6-public/TRICKS
@@ -0,0 +1,140 @@
+This file lists subtle things that might not be commented 
+as well as they should be in the source code and that
+might be worth pointing out in a longer explanation or in class.
+
+---
+
+[2009/07/12: No longer relevant; forkret1 changed
+and this is now cleaner.]
+
+forkret1 in trapasm.S is called with a tf argument.
+In order to use it, forkret1 copies the tf pointer into
+%esp and then jumps to trapret, which pops the 
+register state out of the trap frame.  If an interrupt
+came in between the mov tf, %esp and the iret that
+goes back out to user space, the interrupt stack frame
+would end up scribbling over the tf and whatever memory
+lay under it.
+
+Why is this safe?  Because forkret1 is only called
+the first time a process returns to user space, and
+at that point, cp->tf is set to point to a trap frame
+constructed at the top of cp's kernel stack.  So tf 
+*is* a valid %esp that can hold interrupt state.
+
+If other tf's were used in forkret1, we could add
+a cli before the mov tf, %esp.
+
+---
+
+In pushcli, must cli() no matter what.  It is not safe to do
+
+  if(cpus[cpu()].ncli == 0)
+    cli();
+  cpus[cpu()].ncli++;
+
+because if interrupts are off then we might call cpu(), get
+rescheduled to a different cpu, look at cpus[oldcpu].ncli,
+and wrongly decide not to disable interrupts on the new cpu.
+
+Instead do 
+
+  cli();
+  cpus[cpu()].ncli++;
+
+always.
+
+---
+
+There is a (harmless) race in pushcli, which does
+
+	eflags = readeflags();
+	cli();
+	if(c->ncli++ == 0)
+		c->intena = eflags & FL_IF;
+
+Consider a bottom-level pushcli.  
+If interrupts are disabled already, then the right thing
+happens: read_eflags finds that FL_IF is not set,
+and intena = 0.  If interrupts are enabled, then
+it is less clear that the right thing happens:
+the readeflags can execute, then the process
+can get preempted and rescheduled on another cpu,
+and then once it starts running, perhaps with 
+interrupts disabled (can happen since the scheduler
+only enables interrupts once per scheduling loop,
+not every time it schedules a process), it will 
+incorrectly record that interrupts *were* enabled.
+This doesn't matter, because if it was safe to be
+running with interrupts enabled before the context
+switch, it is still safe (and arguably more correct)
+to run with them enabled after the context switch too.
+
+In fact it would be safe if scheduler always set
+	c->intena = 1;
+before calling swtch, and perhaps it should.
+
+---
+
+The x86's processor-ordering memory model 
+matches spin locks well, so no explicit memory
+synchronization instructions are required in
+acquire and release.  
+
+Consider two sequences of code on different CPUs:
+
+CPU0
+A;
+release(lk);
+
+and
+
+CPU1
+acquire(lk);
+B;
+
+We want to make sure that:
+  - all reads in B see the effects of writes in A.
+  - all reads in A do *not* see the effects of writes in B.
+ 
+The x86 guarantees that writes in A will go out
+to memory before the write of lk->locked = 0 in 
+release(lk).  It further guarantees that CPU1 
+will observe CPU0's write of lk->locked = 0 only
+after observing the earlier writes by CPU0.
+So any reads in B are guaranteed to observe the
+effects of writes in A.
+
+According to the Intel manual behavior spec, the
+second condition requires a serialization instruction
+in release, to avoid reads in A happening after giving
+up lk.  No Intel SMP processor in existence actually
+moves reads down after writes, but the language in
+the spec allows it.  There is no telling whether future
+processors will need it.
+
+---
+
+The code in fork needs to read np->pid before
+setting np->state to RUNNABLE.  The following
+is not a correct way to do this:
+
+	int
+	fork(void)
+	{
+	  ...
+	  np->state = RUNNABLE;
+	  return np->pid; // oops
+	}
+
+After setting np->state to RUNNABLE, some other CPU
+might run the process, it might exit, and then it might
+get reused for a different process (with a new pid), all
+before the return statement.  So it's not safe to just
+"return np->pid". Even saving a copy of np->pid before
+setting np->state isn't safe, since the compiler is
+allowed to re-order statements.
+
+The real code saves a copy of np->pid, then acquires a lock
+around the write to np->state. The acquire() prevents the
+compiler from re-ordering.
diff --git a/xv6-public/alarmtest.c b/xv6-public/alarmtest.c
new file mode 100644
index 0000000..cef0a23
--- /dev/null
+++ b/xv6-public/alarmtest.c
@@ -0,0 +1,25 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+void periodic();
+
+int
+main(int argc, char *argv[])
+{
+  int i;
+  printf(1, "alarmtest starting\n");
+  alarm(10, periodic);
+  for(i = 0; i < 25*5000000; i++){
+    if((i % 250000) == 0)
+      write(2, ".", 1);
+  }
+  exit();
+}
+
+void
+periodic()
+{
+  printf(1, "alarm!\n");
+}
+
diff --git a/xv6-public/asm.h b/xv6-public/asm.h
new file mode 100644
index 0000000..b8a7353
--- /dev/null
+++ b/xv6-public/asm.h
@@ -0,0 +1,18 @@
+//
+// assembler macros to create x86 segments
+//
+
+#define SEG_NULLASM                                             \
+        .word 0, 0;                                             \
+        .byte 0, 0, 0, 0
+
+// The 0xC0 means the limit is in 4096-byte units
+// and (for executable segments) 32-bit mode.
+#define SEG_ASM(type,base,lim)                                  \
+        .word (((lim) >> 12) & 0xffff), ((base) & 0xffff);      \
+        .byte (((base) >> 16) & 0xff), (0x90 | (type)),         \
+                (0xC0 | (((lim) >> 28) & 0xf)), (((base) >> 24) & 0xff)
+
+#define STA_X     0x8       // Executable segment
+#define STA_W     0x2       // Writeable (non-executable segments)
+#define STA_R     0x2       // Readable (executable segments)
diff --git a/xv6-public/bio.c b/xv6-public/bio.c
new file mode 100644
index 0000000..a45ff3e
--- /dev/null
+++ b/xv6-public/bio.c
@@ -0,0 +1,144 @@
+// Buffer cache.
+//
+// The buffer cache is a linked list of buf structures holding
+// cached copies of disk block contents.  Caching disk blocks
+// in memory reduces the number of disk reads and also provides
+// a synchronization point for disk blocks used by multiple processes.
+//
+// Interface:
+// * To get a buffer for a particular disk block, call bread.
+// * After changing buffer data, call bwrite to write it to disk.
+// * When done with the buffer, call brelse.
+// * Do not use the buffer after calling brelse.
+// * Only one process at a time can use a buffer,
+//     so do not keep them longer than necessary.
+//
+// The implementation uses two state flags internally:
+// * B_VALID: the buffer data has been read from the disk.
+// * B_DIRTY: the buffer data has been modified
+//     and needs to be written to disk.
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "fs.h"
+#include "buf.h"
+
+struct {
+  struct spinlock lock;
+  struct buf buf[NBUF];
+
+  // Linked list of all buffers, through prev/next.
+  // head.next is most recently used.
+  struct buf head;
+} bcache;
+
+void
+binit(void)
+{
+  struct buf *b;
+
+  initlock(&bcache.lock, "bcache");
+
+//PAGEBREAK!
+  // Create linked list of buffers
+  bcache.head.prev = &bcache.head;
+  bcache.head.next = &bcache.head;
+  for(b = bcache.buf; b < bcache.buf+NBUF; b++){
+    b->next = bcache.head.next;
+    b->prev = &bcache.head;
+    initsleeplock(&b->lock, "buffer");
+    bcache.head.next->prev = b;
+    bcache.head.next = b;
+  }
+}
+
+// Look through buffer cache for block on device dev.
+// If not found, allocate a buffer.
+// In either case, return locked buffer.
+static struct buf*
+bget(uint dev, uint blockno)
+{
+  struct buf *b;
+
+  acquire(&bcache.lock);
+
+  // Is the block already cached?
+  for(b = bcache.head.next; b != &bcache.head; b = b->next){
+    if(b->dev == dev && b->blockno == blockno){
+      b->refcnt++;
+      release(&bcache.lock);
+      acquiresleep(&b->lock);
+      return b;
+    }
+  }
+
+  // Not cached; recycle an unused buffer.
+  // Even if refcnt==0, B_DIRTY indicates a buffer is in use
+  // because log.c has modified it but not yet committed it.
+  for(b = bcache.head.prev; b != &bcache.head; b = b->prev){
+    if(b->refcnt == 0 && (b->flags & B_DIRTY) == 0) {
+      b->dev = dev;
+      b->blockno = blockno;
+      b->flags = 0;
+      b->refcnt = 1;
+      release(&bcache.lock);
+      acquiresleep(&b->lock);
+      return b;
+    }
+  }
+  panic("bget: no buffers");
+}
+
+// Return a locked buf with the contents of the indicated block.
+struct buf*
+bread(uint dev, uint blockno)
+{
+  struct buf *b;
+
+  b = bget(dev, blockno);
+  if((b->flags & B_VALID) == 0) {
+    iderw(b);
+  }
+  return b;
+}
+
+// Write b's contents to disk.  Must be locked.
+void
+bwrite(struct buf *b)
+{
+  if(!holdingsleep(&b->lock))
+    panic("bwrite");
+  b->flags |= B_DIRTY;
+  iderw(b);
+}
+
+// Release a locked buffer.
+// Move to the head of the MRU list.
+void
+brelse(struct buf *b)
+{
+  if(!holdingsleep(&b->lock))
+    panic("brelse");
+
+  releasesleep(&b->lock);
+
+  acquire(&bcache.lock);
+  b->refcnt--;
+  if (b->refcnt == 0) {
+    // no one is waiting for it.
+    b->next->prev = b->prev;
+    b->prev->next = b->next;
+    b->next = bcache.head.next;
+    b->prev = &bcache.head;
+    bcache.head.next->prev = b;
+    bcache.head.next = b;
+  }
+  
+  release(&bcache.lock);
+}
+//PAGEBREAK!
+// Blank page.
+
diff --git a/xv6-public/bootasm.S b/xv6-public/bootasm.S
new file mode 100644
index 0000000..257867c
--- /dev/null
+++ b/xv6-public/bootasm.S
@@ -0,0 +1,88 @@
+#include "asm.h"
+#include "memlayout.h"
+#include "mmu.h"
+
+# Start the first CPU: switch to 32-bit protected mode, jump into C.
+# The BIOS loads this code from the first sector of the hard disk into
+# memory at physical address 0x7c00 and starts executing in real mode
+# with %cs=0 %ip=7c00.
+
+.code16                       # Assemble for 16-bit mode
+.globl start
+start:
+  cli                         # BIOS enabled interrupts; disable
+
+  # Zero data segment registers DS, ES, and SS.
+  xorw    %ax,%ax             # Set %ax to zero
+  movw    %ax,%ds             # -> Data Segment
+  movw    %ax,%es             # -> Extra Segment
+  movw    %ax,%ss             # -> Stack Segment
+
+  # Physical address line A20 is tied to zero so that the first PCs 
+  # with 2 MB would run software that assumed 1 MB.  Undo that.
+seta20.1:
+  inb     $0x64,%al               # Wait for not busy
+  testb   $0x2,%al
+  jnz     seta20.1
+
+  movb    $0xd1,%al               # 0xd1 -> port 0x64
+  outb    %al,$0x64
+
+seta20.2:
+  inb     $0x64,%al               # Wait for not busy
+  testb   $0x2,%al
+  jnz     seta20.2
+
+  movb    $0xdf,%al               # 0xdf -> port 0x60
+  outb    %al,$0x60
+
+  # Switch from real to protected mode.  Use a bootstrap GDT that makes
+  # virtual addresses map directly to physical addresses so that the
+  # effective memory map doesn't change during the transition.
+  lgdt    gdtdesc
+  movl    %cr0, %eax
+  orl     $CR0_PE, %eax
+  movl    %eax, %cr0
+
+//PAGEBREAK!
+  # Complete the transition to 32-bit protected mode by using a long jmp
+  # to reload %cs and %eip.  The segment descriptors are set up with no
+  # translation, so that the mapping is still the identity mapping.
+  ljmp    $(SEG_KCODE<<3), $start32
+
+.code32  # Tell assembler to generate 32-bit code now.
+start32:
+  # Set up the protected-mode data segment registers
+  movw    $(SEG_KDATA<<3), %ax    # Our data segment selector
+  movw    %ax, %ds                # -> DS: Data Segment
+  movw    %ax, %es                # -> ES: Extra Segment
+  movw    %ax, %ss                # -> SS: Stack Segment
+  movw    $0, %ax                 # Zero segments not ready for use
+  movw    %ax, %fs                # -> FS
+  movw    %ax, %gs                # -> GS
+
+  # Set up the stack pointer and call into C.
+  movl    $start, %esp
+  call    bootmain
+
+  # If bootmain returns (it shouldn't), trigger a Bochs
+  # breakpoint if running under Bochs, then loop.
+  movw    $0x8a00, %ax            # 0x8a00 -> port 0x8a00
+  movw    %ax, %dx
+  outw    %ax, %dx
+  movw    $0x8ae0, %ax            # 0x8ae0 -> port 0x8a00
+  outw    %ax, %dx
+spin:
+  jmp     spin
+
+# Bootstrap GDT
+.p2align 2                                # force 4 byte alignment
+gdt:
+  SEG_NULLASM                             # null seg
+  SEG_ASM(STA_X|STA_R, 0x0, 0xffffffff)   # code seg
+  SEG_ASM(STA_W, 0x0, 0xffffffff)         # data seg
+
+gdtdesc:
+  .word   (gdtdesc - gdt - 1)             # sizeof(gdt) - 1
+  .long   gdt                             # address gdt
+
diff --git a/xv6-public/bootmain.c b/xv6-public/bootmain.c
new file mode 100644
index 0000000..1f20e5b
--- /dev/null
+++ b/xv6-public/bootmain.c
@@ -0,0 +1,96 @@
+// Boot loader.
+//
+// Part of the boot block, along with bootasm.S, which calls bootmain().
+// bootasm.S has put the processor into protected 32-bit mode.
+// bootmain() loads an ELF kernel image from the disk starting at
+// sector 1 and then jumps to the kernel entry routine.
+
+#include "types.h"
+#include "elf.h"
+#include "x86.h"
+#include "memlayout.h"
+
+#define SECTSIZE  512
+
+void readseg(uchar*, uint, uint);
+
+void
+bootmain(void)
+{
+  struct elfhdr *elf;
+  struct proghdr *ph, *eph;
+  void (*entry)(void);
+  uchar* pa;
+
+  elf = (struct elfhdr*)0x10000;  // scratch space
+
+  // Read 1st page off disk
+  readseg((uchar*)elf, 4096, 0);
+
+  // Is this an ELF executable?
+  if(elf->magic != ELF_MAGIC)
+    return;  // let bootasm.S handle error
+
+  // Load each program segment (ignores ph flags).
+  ph = (struct proghdr*)((uchar*)elf + elf->phoff);
+  eph = ph + elf->phnum;
+  for(; ph < eph; ph++){
+    pa = (uchar*)ph->paddr;
+    readseg(pa, ph->filesz, ph->off);
+    if(ph->memsz > ph->filesz)
+      stosb(pa + ph->filesz, 0, ph->memsz - ph->filesz);
+  }
+
+  // Call the entry point from the ELF header.
+  // Does not return!
+  entry = (void(*)(void))(elf->entry);
+  entry();
+}
+
+void
+waitdisk(void)
+{
+  // Wait for disk ready.
+  while((inb(0x1F7) & 0xC0) != 0x40)
+    ;
+}
+
+// Read a single sector at offset into dst.
+void
+readsect(void *dst, uint offset)
+{
+  // Issue command.
+  waitdisk();
+  outb(0x1F2, 1);   // count = 1
+  outb(0x1F3, offset);
+  outb(0x1F4, offset >> 8);
+  outb(0x1F5, offset >> 16);
+  outb(0x1F6, (offset >> 24) | 0xE0);
+  outb(0x1F7, 0x20);  // cmd 0x20 - read sectors
+
+  // Read data.
+  waitdisk();
+  insl(0x1F0, dst, SECTSIZE/4);
+}
+
+// Read 'count' bytes at 'offset' from kernel into physical address 'pa'.
+// Might copy more than asked.
+void
+readseg(uchar* pa, uint count, uint offset)
+{
+  uchar* epa;
+
+  epa = pa + count;
+
+  // Round down to sector boundary.
+  pa -= offset % SECTSIZE;
+
+  // Translate from bytes to sectors; kernel starts at sector 1.
+  offset = (offset / SECTSIZE) + 1;
+
+  // If this is too slow, we could read lots of sectors at a time.
+  // We'd write more to memory than asked, but it doesn't matter --
+  // we load in increasing order.
+  for(; pa < epa; pa += SECTSIZE, offset++)
+    readsect(pa, offset);
+}
diff --git a/xv6-public/buf.h b/xv6-public/buf.h
new file mode 100644
index 0000000..3266495
--- /dev/null
+++ b/xv6-public/buf.h
@@ -0,0 +1,14 @@
+struct buf {
+  int flags;
+  uint dev;
+  uint blockno;
+  struct sleeplock lock;
+  uint refcnt;
+  struct buf *prev; // LRU cache list
+  struct buf *next;
+  struct buf *qnext; // disk queue
+  uchar data[BSIZE];
+};
+#define B_VALID 0x2  // buffer has been read from disk
+#define B_DIRTY 0x4  // buffer needs to be written to disk
+
diff --git a/xv6-public/cat.c b/xv6-public/cat.c
new file mode 100644
index 0000000..5ddc820
--- /dev/null
+++ b/xv6-public/cat.c
@@ -0,0 +1,43 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+char buf[512];
+
+void
+cat(int fd)
+{
+  int n;
+
+  while((n = read(fd, buf, sizeof(buf))) > 0) {
+    if (write(1, buf, n) != n) {
+      printf(1, "cat: write error\n");
+      exit();
+    }
+  }
+  if(n < 0){
+    printf(1, "cat: read error\n");
+    exit();
+  }
+}
+
+int
+main(int argc, char *argv[])
+{
+  int fd, i;
+
+  if(argc <= 1){
+    cat(0);
+    exit();
+  }
+
+  for(i = 1; i < argc; i++){
+    if((fd = open(argv[i], 0)) < 0){
+      printf(1, "cat: cannot open %s\n", argv[i]);
+      exit();
+    }
+    cat(fd);
+    close(fd);
+  }
+  exit();
+}
diff --git a/xv6-public/console.c b/xv6-public/console.c
new file mode 100644
index 0000000..a280d2b
--- /dev/null
+++ b/xv6-public/console.c
@@ -0,0 +1,299 @@
+// Console input and output.
+// Input is from the keyboard or serial port.
+// Output is written to the screen and serial port.
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "traps.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "fs.h"
+#include "file.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+
+static void consputc(int);
+
+static int panicked = 0;
+
+static struct {
+  struct spinlock lock;
+  int locking;
+} cons;
+
+static void
+printint(int xx, int base, int sign)
+{
+  static char digits[] = "0123456789abcdef";
+  char buf[16];
+  int i;
+  uint x;
+
+  if(sign && (sign = xx < 0))
+    x = -xx;
+  else
+    x = xx;
+
+  i = 0;
+  do{
+    buf[i++] = digits[x % base];
+  }while((x /= base) != 0);
+
+  if(sign)
+    buf[i++] = '-';
+
+  while(--i >= 0)
+    consputc(buf[i]);
+}
+//PAGEBREAK: 50
+
+// Print to the console. only understands %d, %x, %p, %s.
+void
+cprintf(char *fmt, ...)
+{
+  int i, c, locking;
+  uint *argp;
+  char *s;
+
+  locking = cons.locking;
+  if(locking)
+    acquire(&cons.lock);
+
+  if (fmt == 0)
+    panic("null fmt");
+
+  argp = (uint*)(void*)(&fmt + 1);
+  for(i = 0; (c = fmt[i] & 0xff) != 0; i++){
+    if(c != '%'){
+      consputc(c);
+      continue;
+    }
+    c = fmt[++i] & 0xff;
+    if(c == 0)
+      break;
+    switch(c){
+    case 'd':
+      printint(*argp++, 10, 1);
+      break;
+    case 'x':
+    case 'p':
+      printint(*argp++, 16, 0);
+      break;
+    case 's':
+      if((s = (char*)*argp++) == 0)
+        s = "(null)";
+      for(; *s; s++)
+        consputc(*s);
+      break;
+    case '%':
+      consputc('%');
+      break;
+    default:
+      // Print unknown % sequence to draw attention.
+      consputc('%');
+      consputc(c);
+      break;
+    }
+  }
+
+  if(locking)
+    release(&cons.lock);
+}
+
+void
+panic(char *s)
+{
+  int i;
+  uint pcs[10];
+
+  cli();
+  cons.locking = 0;
+  // use lapiccpunum so that we can call panic from mycpu()
+  cprintf("lapicid %d: panic: ", lapicid());
+  cprintf(s);
+  cprintf("\n");
+  getcallerpcs(&s, pcs);
+  for(i=0; i<10; i++)
+    cprintf(" %p", pcs[i]);
+  panicked = 1; // freeze other CPU
+  for(;;)
+    ;
+}
+
+//PAGEBREAK: 50
+#define BACKSPACE 0x100
+#define CRTPORT 0x3d4
+static ushort *crt = (ushort*)P2V(0xb8000);  // CGA memory
+
+static void
+cgaputc(int c)
+{
+  int pos;
+
+  // Cursor position: col + 80*row.
+  outb(CRTPORT, 14);
+  pos = inb(CRTPORT+1) << 8;
+  outb(CRTPORT, 15);
+  pos |= inb(CRTPORT+1);
+
+  if(c == '\n')
+    pos += 80 - pos%80;
+  else if(c == BACKSPACE){
+    if(pos > 0) --pos;
+  } else
+    crt[pos++] = (c&0xff) | 0x0700;  // black on white
+
+  if(pos < 0 || pos > 25*80)
+    panic("pos under/overflow");
+
+  if((pos/80) >= 24){  // Scroll up.
+    memmove(crt, crt+80, sizeof(crt[0])*23*80);
+    pos -= 80;
+    memset(crt+pos, 0, sizeof(crt[0])*(24*80 - pos));
+  }
+
+  outb(CRTPORT, 14);
+  outb(CRTPORT+1, pos>>8);
+  outb(CRTPORT, 15);
+  outb(CRTPORT+1, pos);
+  crt[pos] = ' ' | 0x0700;
+}
+
+void
+consputc(int c)
+{
+  if(panicked){
+    cli();
+    for(;;)
+      ;
+  }
+
+  if(c == BACKSPACE){
+    uartputc('\b'); uartputc(' '); uartputc('\b');
+  } else
+    uartputc(c);
+  cgaputc(c);
+}
+
+#define INPUT_BUF 128
+struct {
+  char buf[INPUT_BUF];
+  uint r;  // Read index
+  uint w;  // Write index
+  uint e;  // Edit index
+} input;
+
+#define C(x)  ((x)-'@')  // Control-x
+
+void
+consoleintr(int (*getc)(void))
+{
+  int c, doprocdump = 0;
+
+  acquire(&cons.lock);
+  while((c = getc()) >= 0){
+    switch(c){
+    case C('P'):  // Process listing.
+      // procdump() locks cons.lock indirectly; invoke later
+      doprocdump = 1;
+      break;
+    case C('U'):  // Kill line.
+      while(input.e != input.w &&
+            input.buf[(input.e-1) % INPUT_BUF] != '\n'){
+        input.e--;
+        consputc(BACKSPACE);
+      }
+      break;
+    case C('H'): case '\x7f':  // Backspace
+      if(input.e != input.w){
+        input.e--;
+        consputc(BACKSPACE);
+      }
+      break;
+    default:
+      if(c != 0 && input.e-input.r < INPUT_BUF){
+        c = (c == '\r') ? '\n' : c;
+        input.buf[input.e++ % INPUT_BUF] = c;
+        consputc(c);
+        if(c == '\n' || c == C('D') || input.e == input.r+INPUT_BUF){
+          input.w = input.e;
+          wakeup(&input.r);
+        }
+      }
+      break;
+    }
+  }
+  release(&cons.lock);
+  if(doprocdump) {
+    procdump();  // now call procdump() wo. cons.lock held
+  }
+}
+
+int
+consoleread(struct inode *ip, char *dst, int n)
+{
+  uint target;
+  int c;
+
+  iunlock(ip);
+  target = n;
+  acquire(&cons.lock);
+  while(n > 0){
+    while(input.r == input.w){
+      if(myproc()->killed){
+        release(&cons.lock);
+        ilock(ip);
+        return -1;
+      }
+      sleep(&input.r, &cons.lock);
+    }
+    c = input.buf[input.r++ % INPUT_BUF];
+    if(c == C('D')){  // EOF
+      if(n < target){
+        // Save ^D for next time, to make sure
+        // caller gets a 0-byte result.
+        input.r--;
+      }
+      break;
+    }
+    *dst++ = c;
+    --n;
+    if(c == '\n')
+      break;
+  }
+  release(&cons.lock);
+  ilock(ip);
+
+  return target - n;
+}
+
+int
+consolewrite(struct inode *ip, char *buf, int n)
+{
+  int i;
+
+  iunlock(ip);
+  acquire(&cons.lock);
+  for(i = 0; i < n; i++)
+    consputc(buf[i] & 0xff);
+  release(&cons.lock);
+  ilock(ip);
+
+  return n;
+}
+
+void
+consoleinit(void)
+{
+  initlock(&cons.lock, "console");
+
+  devsw[CONSOLE].write = consolewrite;
+  devsw[CONSOLE].read = consoleread;
+  cons.locking = 1;
+
+  ioapicenable(IRQ_KBD, 0);
+}
+
diff --git a/xv6-public/cuth b/xv6-public/cuth
new file mode 100644
index 0000000..cce8c0c
--- /dev/null
+++ b/xv6-public/cuth
@@ -0,0 +1,48 @@
+#!/usr/bin/perl
+
+$| = 1;
+
+sub writefile($@){
+	my ($file, @lines) = @_;
+	
+	sleep(1);
+	open(F, ">$file") || die "open >$file: $!";
+	print F @lines;
+	close(F);
+}
+
+# Cut out #include lines that don't contribute anything.
+for($i=0; $i<@ARGV; $i++){
+	$file = $ARGV[$i];
+	if(!open(F, $file)){
+		print STDERR "open $file: $!\n";
+		next;
+	}
+	@lines = <F>;
+	close(F);
+	
+	$obj = "$file.o";
+	$obj =~ s/\.c\.o$/.o/;
+	system("touch $file");
+
+	if(system("make CC='gcc -Werror' $obj >/dev/null 2>\&1") != 0){
+		print STDERR "make $obj failed: $rv\n";
+		next;
+	}
+
+	system("cp $file =$file");
+	for($j=@lines-1; $j>=0; $j--){
+		if($lines[$j] =~ /^#include/){
+			$old = $lines[$j];
+			$lines[$j] = "/* CUT-H */\n";
+			writefile($file, @lines);
+			if(system("make CC='gcc -Werror' $obj >/dev/null 2>\&1") != 0){
+				$lines[$j] = $old;
+			}else{
+				print STDERR "$file $old";
+			}
+		}
+	}
+	writefile($file, grep {!/CUT-H/} @lines);
+	system("rm =$file");
+}
diff --git a/xv6-public/date.c b/xv6-public/date.c
new file mode 100644
index 0000000..4744c48
--- /dev/null
+++ b/xv6-public/date.c
@@ -0,0 +1,20 @@
+#include "types.h"
+#include "user.h"
+#include "date.h"
+
+
+
+int
+main(int argc, char *argv[])
+{
+	struct rtcdate r;
+
+	if (date(&r)) {
+		printf(2, "date failed\n");
+		exit();
+	}
+
+	// your code to print the time in any format you like...
+	printf(1, "%d-%d-%d %d:%d\n",r.year, r.month, r.day, r.hour, r.minute);
+	exit();
+}
diff --git a/xv6-public/date.h b/xv6-public/date.h
new file mode 100644
index 0000000..94aec4b
--- /dev/null
+++ b/xv6-public/date.h
@@ -0,0 +1,8 @@
+struct rtcdate {
+  uint second;
+  uint minute;
+  uint hour;
+  uint day;
+  uint month;
+  uint year;
+};
diff --git a/xv6-public/defs.h b/xv6-public/defs.h
new file mode 100644
index 0000000..82fb982
--- /dev/null
+++ b/xv6-public/defs.h
@@ -0,0 +1,190 @@
+struct buf;
+struct context;
+struct file;
+struct inode;
+struct pipe;
+struct proc;
+struct rtcdate;
+struct spinlock;
+struct sleeplock;
+struct stat;
+struct superblock;
+
+// bio.c
+void            binit(void);
+struct buf*     bread(uint, uint);
+void            brelse(struct buf*);
+void            bwrite(struct buf*);
+
+// console.c
+void            consoleinit(void);
+void            cprintf(char*, ...);
+void            consoleintr(int(*)(void));
+void            panic(char*) __attribute__((noreturn));
+
+// exec.c
+int             exec(char*, char**);
+
+// file.c
+struct file*    filealloc(void);
+void            fileclose(struct file*);
+struct file*    filedup(struct file*);
+void            fileinit(void);
+int             fileread(struct file*, char*, int n);
+int             filestat(struct file*, struct stat*);
+int             filewrite(struct file*, char*, int n);
+
+// fs.c
+void            readsb(int dev, struct superblock *sb);
+int             dirlink(struct inode*, char*, uint);
+struct inode*   dirlookup(struct inode*, char*, uint*);
+struct inode*   ialloc(uint, short);
+struct inode*   idup(struct inode*);
+void            iinit(int dev);
+void            ilock(struct inode*);
+void            iput(struct inode*);
+void            iunlock(struct inode*);
+void            iunlockput(struct inode*);
+void            iupdate(struct inode*);
+int             namecmp(const char*, const char*);
+struct inode*   namei(char*);
+struct inode*   nameiparent(char*, char*);
+int             readi(struct inode*, char*, uint, uint);
+void            stati(struct inode*, struct stat*);
+int             writei(struct inode*, char*, uint, uint);
+
+// ide.c
+void            ideinit(void);
+void            ideintr(void);
+void            iderw(struct buf*);
+
+// ioapic.c
+void            ioapicenable(int irq, int cpu);
+extern uchar    ioapicid;
+void            ioapicinit(void);
+
+// kalloc.c
+char*           kalloc(void);
+void            kfree(char*);
+void            kinit1(void*, void*);
+void            kinit2(void*, void*);
+
+// kbd.c
+void            kbdintr(void);
+
+// lapic.c
+void            cmostime(struct rtcdate *r);
+int             lapicid(void);
+extern volatile uint*    lapic;
+void            lapiceoi(void);
+void            lapicinit(void);
+void            lapicstartap(uchar, uint);
+void            microdelay(int);
+
+// log.c
+void            initlog(int dev);
+void            log_write(struct buf*);
+void            begin_op();
+void            end_op();
+
+// mp.c
+extern int      ismp;
+void            mpinit(void);
+
+// picirq.c
+void            picenable(int);
+void            picinit(void);
+
+// pipe.c
+int             pipealloc(struct file**, struct file**);
+void            pipeclose(struct pipe*, int);
+int             piperead(struct pipe*, char*, int);
+int             pipewrite(struct pipe*, char*, int);
+
+//PAGEBREAK: 16
+// proc.c
+int             cpuid(void);
+void            exit(void);
+int             fork(void);
+int             growproc(int);
+int             kill(int);
+struct cpu*     mycpu(void);
+struct proc*    myproc();
+void            pinit(void);
+void            procdump(void);
+void            scheduler(void) __attribute__((noreturn));
+void            sched(void);
+void            setproc(struct proc*);
+void            sleep(void*, struct spinlock*);
+void            userinit(void);
+int             wait(void);
+void            wakeup(void*);
+void            yield(void);
+
+// swtch.S
+void            swtch(struct context**, struct context*);
+
+// spinlock.c
+void            acquire(struct spinlock*);
+void            getcallerpcs(void*, uint*);
+int             holding(struct spinlock*);
+void            initlock(struct spinlock*, char*);
+void            release(struct spinlock*);
+void            pushcli(void);
+void            popcli(void);
+
+// sleeplock.c
+void            acquiresleep(struct sleeplock*);
+void            releasesleep(struct sleeplock*);
+int             holdingsleep(struct sleeplock*);
+void            initsleeplock(struct sleeplock*, char*);
+
+// string.c
+int             memcmp(const void*, const void*, uint);
+void*           memmove(void*, const void*, uint);
+void*           memset(void*, int, uint);
+char*           safestrcpy(char*, const char*, int);
+int             strlen(const char*);
+int             strncmp(const char*, const char*, uint);
+char*           strncpy(char*, const char*, int);
+
+// syscall.c
+int             argint(int, int*);
+int             argptr(int, char**, int);
+int             argstr(int, char**);
+int             fetchint(uint, int*);
+int             fetchstr(uint, char**);
+void            syscall(void);
+
+// timer.c
+void            timerinit(void);
+
+// trap.c
+void            idtinit(void);
+extern uint     ticks;
+void            tvinit(void);
+extern struct spinlock tickslock;
+
+// uart.c
+void            uartinit(void);
+void            uartintr(void);
+void            uartputc(int);
+
+// vm.c
+void            seginit(void);
+void            kvmalloc(void);
+pde_t*          setupkvm(void);
+char*           uva2ka(pde_t*, char*);
+int             allocuvm(pde_t*, uint, uint);
+int             deallocuvm(pde_t*, uint, uint);
+void            freevm(pde_t*);
+void            inituvm(pde_t*, char*, uint);
+int             loaduvm(pde_t*, char*, struct inode*, uint, uint);
+pde_t*          copyuvm(pde_t*, uint);
+void            switchuvm(struct proc*);
+void            switchkvm(void);
+int             copyout(pde_t*, uint, void*, uint);
+void            clearpteu(pde_t *pgdir, char *uva);
+
+// number of elements in fixed-size array
+#define NELEM(x) (sizeof(x)/sizeof((x)[0]))
diff --git a/xv6-public/dot-bochsrc b/xv6-public/dot-bochsrc
new file mode 100644
index 0000000..ba13db7
--- /dev/null
+++ b/xv6-public/dot-bochsrc
@@ -0,0 +1,738 @@
+# You may now use double quotes around pathnames, in case
+# your pathname includes spaces.
+
+#=======================================================================
+# CONFIG_INTERFACE
+#
+# The configuration interface is a series of menus or dialog boxes that
+# allows you to change all the settings that control Bochs's behavior.
+# There are two choices of configuration interface: a text mode version
+# called "textconfig" and a graphical version called "wx".  The text
+# mode version uses stdin/stdout and is always compiled in.  The graphical
+# version is only available when you use "--with-wx" on the configure 
+# command.  If you do not write a config_interface line, Bochs will 
+# choose a default for you.
+#
+# NOTE: if you use the "wx" configuration interface, you must also use
+# the "wx" display library.
+#=======================================================================
+#config_interface: textconfig
+#config_interface: wx
+
+#=======================================================================
+# DISPLAY_LIBRARY
+#
+# The display library is the code that displays the Bochs VGA screen.  Bochs 
+# has a selection of about 10 different display library implementations for 
+# different platforms.  If you run configure with multiple --with-* options, 
+# the display_library command lets you choose which one you want to run with.
+# If you do not write a display_library line, Bochs will choose a default for
+# you.
+#
+# The choices are: 
+#   x              use X windows interface, cross platform
+#   win32          use native win32 libraries
+#   carbon         use Carbon library (for MacOS X)
+#   beos           use native BeOS libraries
+#   macintosh      use MacOS pre-10
+#   amigaos        use native AmigaOS libraries
+#   sdl            use SDL library, cross platform
+#   svga           use SVGALIB library for Linux, allows graphics without X11
+#   term           text only, uses curses/ncurses library, cross platform
+#   rfb            provides an interface to AT&T's VNC viewer, cross platform
+#   wx             use wxWidgets library, cross platform
+#   nogui          no display at all
+#
+# NOTE: if you use the "wx" configuration interface, you must also use
+# the "wx" display library.
+#
+# Specific options:
+# Some display libraries now support specific option to control their
+# behaviour. See the examples below for currently supported options.
+#=======================================================================
+#display_library: amigaos
+#display_library: beos
+#display_library: carbon
+#display_library: macintosh
+#display_library: nogui
+#display_library: rfb, options="timeout=60" # time to wait for client
+#display_library: sdl, options="fullscreen" # startup in fullscreen mode
+#display_library: term
+#display_library: win32, options="legacyF12" # use F12 to toggle mouse
+#display_library: wx
+#display_library: x
+
+#=======================================================================
+# ROMIMAGE:
+# The ROM BIOS controls what the PC does when it first powers on.
+# Normally, you can use a precompiled BIOS in the source or binary
+# distribution called BIOS-bochs-latest. The ROM BIOS is usually loaded
+# starting at address 0xf0000, and it is exactly 64k long.
+# You can also use the environment variable $BXSHARE to specify the
+# location of the BIOS.
+# The usage of external large BIOS images (up to 512k) at memory top is
+# now supported, but we still recommend to use the BIOS distributed with
+# Bochs. Now the start address can be calculated from image size.
+#=======================================================================
+romimage: file=$BXSHARE/BIOS-bochs-latest
+#romimage: file=mybios.bin, address=0xfff80000 # 512k at memory top
+#romimage: file=mybios.bin # calculate start address from image size
+
+#=======================================================================
+# CPU:
+# This defines cpu-related parameters inside Bochs:
+#
+#  COUNT:
+#  Set the number of processors when Bochs is compiled for SMP emulation.
+#  Bochs currently supports up to 8 processors. If Bochs is compiled
+#  without SMP support, it won't accept values different from 1.
+#
+#  IPS:
+#  Emulated Instructions Per Second.  This is the number of IPS that bochs
+#  is capable of running on your machine. You can recompile Bochs with
+#  --enable-show-ips option enabled, to find your workstation's capability.
+#  Measured IPS value will then be logged into your log file or status bar
+#  (if supported by the gui).
+#
+#  IPS is used to calibrate many time-dependent events within the bochs 
+#  simulation.  For example, changing IPS affects the frequency of VGA
+#  updates, the duration of time before a key starts to autorepeat, and
+#  the measurement of BogoMips and other benchmarks.
+#
+#  Examples:
+#  Machine                                         Mips
+# ________________________________________________________________
+#  2.1Ghz Athlon XP with Linux 2.6/g++ 3.4         12 to 15 Mips
+#  1.6Ghz Intel P4 with Win2000/g++ 3.3             5 to  7 Mips
+#  650Mhz Athlon K-7 with Linux 2.4.4/egcs-2.91.66  2 to  2.5 Mips
+#  400Mhz Pentium II with Linux 2.0.36/egcs-1.0.3   1 to  1.8 Mips
+#=======================================================================
+cpu: count=2, ips=10000000
+
+#=======================================================================
+# MEGS
+# Set the number of Megabytes of physical memory you want to emulate. 
+# The default is 32MB, most OS's won't need more than that.
+# The maximum amount of memory supported is 2048Mb.
+#=======================================================================
+#megs: 256
+#megs: 128
+#megs: 64
+megs: 32
+#megs: 16
+#megs: 8
+
+#=======================================================================
+# OPTROMIMAGE[1-4]:
+# You may now load up to 4 optional ROM images. Be sure to use a 
+# read-only area, typically between C8000 and EFFFF. These optional
+# ROM images should not overwrite the rombios (located at
+# F0000-FFFFF) and the videobios (located at C0000-C7FFF).
+# Those ROM images will be initialized by the bios if they contain 
+# the right signature (0x55AA) and a valid checksum.
+# It can also be a convenient way to upload some arbitrary code/data
+# in the simulation, that can be retrieved by the boot loader
+#=======================================================================
+#optromimage1: file=optionalrom.bin, address=0xd0000
+#optromimage2: file=optionalrom.bin, address=0xd1000
+#optromimage3: file=optionalrom.bin, address=0xd2000
+#optromimage4: file=optionalrom.bin, address=0xd3000
+
+#optramimage1: file=/path/file1.img, address=0x0010000
+#optramimage2: file=/path/file2.img, address=0x0020000
+#optramimage3: file=/path/file3.img, address=0x0030000
+#optramimage4: file=/path/file4.img, address=0x0040000
+
+#=======================================================================
+# VGAROMIMAGE
+# You now need to load a VGA ROM BIOS into C0000.
+#=======================================================================
+#vgaromimage: file=bios/VGABIOS-elpin-2.40
+vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest
+#vgaromimage: file=bios/VGABIOS-lgpl-latest-cirrus
+
+#=======================================================================
+# VGA:
+# Here you can specify the display extension to be used. With the value
+# 'none' you can use standard VGA with no extension. Other supported
+# values are 'vbe' for Bochs VBE and 'cirrus' for Cirrus SVGA support.
+#=======================================================================
+#vga: extension=cirrus
+#vga: extension=vbe
+vga: extension=none
+
+#=======================================================================
+# FLOPPYA:
+# Point this to pathname of floppy image file or device
+# This should be of a bootable floppy(image/device) if you're
+# booting from 'a' (or 'floppy').
+#
+# You can set the initial status of the media to 'ejected' or 'inserted'.
+#   floppya: 2_88=path, status=ejected             (2.88M 3.5" floppy)
+#   floppya: 1_44=path, status=inserted            (1.44M 3.5" floppy)
+#   floppya: 1_2=path, status=ejected              (1.2M  5.25" floppy)
+#   floppya: 720k=path, status=inserted            (720K  3.5" floppy)
+#   floppya: 360k=path, status=inserted            (360K  5.25" floppy)
+#   floppya: 320k=path, status=inserted            (320K  5.25" floppy)
+#   floppya: 180k=path, status=inserted            (180K  5.25" floppy)
+#   floppya: 160k=path, status=inserted            (160K  5.25" floppy)
+#   floppya: image=path, status=inserted           (guess type from image size)
+#
+# The path should be the name of a disk image file.  On Unix, you can use a raw
+# device name such as /dev/fd0 on Linux.  On win32 platforms, use drive letters
+# such as a: or b: as the path.  The parameter 'image' works with image files
+# only. In that case the size must match one of the supported types.
+#=======================================================================
+floppya: 1_44=/dev/fd0, status=inserted
+#floppya: image=../1.44, status=inserted
+#floppya: 1_44=/dev/fd0H1440, status=inserted
+#floppya: 1_2=../1_2, status=inserted
+#floppya: 1_44=a:, status=inserted
+#floppya: 1_44=a.img, status=inserted
+#floppya: 1_44=/dev/rfd0a, status=inserted
+
+#=======================================================================
+# FLOPPYB:
+# See FLOPPYA above for syntax
+#=======================================================================
+#floppyb: 1_44=b:, status=inserted
+floppyb: 1_44=b.img, status=inserted
+
+#=======================================================================
+# ATA0, ATA1, ATA2, ATA3
+# ATA controller for hard disks and cdroms
+#
+# ata[0-3]: enabled=[0|1], ioaddr1=addr, ioaddr2=addr, irq=number
+# 
+# These options enables up to 4 ata channels. For each channel
+# the two base io addresses and the irq must be specified.
+# 
+# ata0 and ata1 are enabled by default with the values shown below
+#
+# Examples:
+#   ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
+#   ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
+#   ata2: enabled=1, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
+#   ata3: enabled=1, ioaddr1=0x168, ioaddr2=0x360, irq=9
+#=======================================================================
+ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
+ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
+ata2: enabled=0, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
+ata3: enabled=0, ioaddr1=0x168, ioaddr2=0x360, irq=9
+
+#=======================================================================
+# ATA[0-3]-MASTER, ATA[0-3]-SLAVE
+#
+# This defines the type and characteristics of all attached ata devices:
+#   type=       type of attached device [disk|cdrom] 
+#   mode=       only valid for disks [flat|concat|external|dll|sparse|vmware3]
+#   mode=       only valid for disks [undoable|growing|volatile]
+#   path=       path of the image
+#   cylinders=  only valid for disks
+#   heads=      only valid for disks
+#   spt=        only valid for disks
+#   status=     only valid for cdroms [inserted|ejected]
+#   biosdetect= type of biosdetection [none|auto], only for disks on ata0 [cmos]
+#   translation=type of translation of the bios, only for disks [none|lba|large|rechs|auto]
+#   model=      string returned by identify device command
+#   journal=    optional filename of the redolog for undoable and volatile disks
+#   
+# Point this at a hard disk image file, cdrom iso file, or physical cdrom
+# device.  To create a hard disk image, try running bximage.  It will help you
+# choose the size and then suggest a line that works with it.
+#
+# In UNIX it may be possible to use a raw device as a Bochs hard disk, 
+# but WE DON'T RECOMMEND IT.  In Windows there is no easy way.
+#
+# In windows, the drive letter + colon notation should be used for cdroms.
+# Depending on versions of windows and drivers, you may only be able to 
+# access the "first" cdrom in the system.  On MacOSX, use path="drive"
+# to access the physical drive.
+#
+# The path is always mandatory. For flat hard disk images created with
+# bximage geometry autodetection can be used (cylinders=0 -> cylinders are
+# calculated using heads=16 and spt=63). For other hard disk images and modes
+# the cylinders, heads, and spt are mandatory.
+#
+# Default values are:
+#   mode=flat, biosdetect=auto, translation=auto, model="Generic 1234"
+#
+# The biosdetect option has currently no effect on the bios
+#
+# Examples:
+#   ata0-master: type=disk, mode=flat, path=10M.sample, cylinders=306, heads=4, spt=17
+#   ata0-slave:  type=disk, mode=flat, path=20M.sample, cylinders=615, heads=4, spt=17
+#   ata1-master: type=disk, mode=flat, path=30M.sample, cylinders=615, heads=6, spt=17
+#   ata1-slave:  type=disk, mode=flat, path=46M.sample, cylinders=940, heads=6, spt=17
+#   ata2-master: type=disk, mode=flat, path=62M.sample, cylinders=940, heads=8, spt=17
+#   ata2-slave:  type=disk, mode=flat, path=112M.sample, cylinders=900, heads=15, spt=17
+#   ata3-master: type=disk, mode=flat, path=483M.sample, cylinders=1024, heads=15, spt=63
+#   ata3-slave:  type=cdrom, path=iso.sample, status=inserted
+#=======================================================================
+ata0-master: type=disk, mode=flat, path="xv6.img", cylinders=100, heads=10, spt=10
+ata0-slave: type=disk, mode=flat, path="fs.img", cylinders=1024, heads=1, spt=1
+#ata0-slave: type=cdrom, path=D:, status=inserted
+#ata0-slave: type=cdrom, path=/dev/cdrom, status=inserted
+#ata0-slave: type=cdrom, path="drive", status=inserted
+#ata0-slave: type=cdrom, path=/dev/rcd0d, status=inserted 
+
+#=======================================================================
+# BOOT:
+# This defines the boot sequence. Now you can specify up to 3 boot drives.
+# You can either boot from 'floppy', 'disk' or 'cdrom'
+# legacy 'a' and 'c' are also supported
+# Examples:
+#   boot: floppy
+#   boot: disk
+#   boot: cdrom
+#   boot: c
+#   boot: a
+#   boot: cdrom, floppy, disk
+#=======================================================================
+#boot: floppy
+boot: disk
+
+#=======================================================================
+# CLOCK:
+# This defines the parameters of the clock inside Bochs:
+#
+#  SYNC:
+#  TO BE COMPLETED (see Greg explanation in feature request #536329)
+#
+#  TIME0:
+#  Specifies the start (boot) time of the virtual machine. Use a time 
+#  value as returned by the time(2) system call. If no time0 value is 
+#  set or if time0 equal to 1 (special case) or if time0 equal 'local', 
+#  the simulation will be started at the current local host time.
+#  If time0 equal to 2 (special case) or if time0 equal 'utc',
+#  the simulation will be started at the current utc time.
+#
+# Syntax:
+#  clock: sync=[none|slowdown|realtime|both], time0=[timeValue|local|utc]
+#
+# Example:
+#   clock: sync=none,     time0=local       # Now (localtime)
+#   clock: sync=slowdown, time0=315529200   # Tue Jan  1 00:00:00 1980
+#   clock: sync=none,     time0=631148400   # Mon Jan  1 00:00:00 1990
+#   clock: sync=realtime, time0=938581955   # Wed Sep 29 07:12:35 1999
+#   clock: sync=realtime, time0=946681200   # Sat Jan  1 00:00:00 2000
+#   clock: sync=none,     time0=1           # Now (localtime)
+#   clock: sync=none,     time0=utc         # Now (utc/gmt)
+# 
+# Default value are sync=none, time0=local
+#=======================================================================
+#clock: sync=none, time0=local
+
+
+#=======================================================================
+# FLOPPY_BOOTSIG_CHECK: disabled=[0|1]
+# Enables or disables the 0xaa55 signature check on boot floppies
+# Defaults to disabled=0
+# Examples:
+#   floppy_bootsig_check: disabled=0
+#   floppy_bootsig_check: disabled=1
+#=======================================================================
+#floppy_bootsig_check: disabled=1
+floppy_bootsig_check: disabled=0
+
+#=======================================================================
+# LOG:
+# Give the path of the log file you'd like Bochs debug and misc. verbiage
+# to be written to. If you don't use this option or set the filename to
+# '-' the output is written to the console. If you really don't want it,
+# make it "/dev/null" (Unix) or "nul" (win32). :^(
+#
+# Examples:
+#   log: ./bochs.out
+#   log: /dev/tty
+#=======================================================================
+#log: /dev/null
+log: bochsout.txt
+
+#=======================================================================
+# LOGPREFIX:
+# This handles the format of the string prepended to each log line.
+# You may use those special tokens :
+#   %t : 11 decimal digits timer tick
+#   %i : 8 hexadecimal digits of cpu current eip (ignored in SMP configuration)
+#   %e : 1 character event type ('i'nfo, 'd'ebug, 'p'anic, 'e'rror)
+#   %d : 5 characters string of the device, between brackets
+# 
+# Default : %t%e%d
+# Examples:
+#   logprefix: %t-%e-@%i-%d
+#   logprefix: %i%e%d
+#=======================================================================
+#logprefix: %t%e%d
+
+#=======================================================================
+# LOG CONTROLS
+#
+# Bochs now has four severity levels for event logging.
+#   panic: cannot proceed.  If you choose to continue after a panic, 
+#          don't be surprised if you get strange behavior or crashes.
+#   error: something went wrong, but it is probably safe to continue the
+#          simulation.
+#   info: interesting or useful messages.
+#   debug: messages useful only when debugging the code.  This may
+#          spit out thousands per second.
+#
+# For events of each level, you can choose to crash, report, or ignore.
+# TODO: allow choice based on the facility: e.g. crash on panics from
+#       everything except the cdrom, and only report those.
+#
+# If you are experiencing many panics, it can be helpful to change
+# the panic action to report instead of fatal.  However, be aware
+# that anything executed after a panic is uncharted territory and can 
+# cause bochs to become unstable.  The panic is a "graceful exit," so
+# if you disable it you may get a spectacular disaster instead.
+#=======================================================================
+panic: action=ask
+error: action=report
+info: action=report
+debug: action=ignore
+#pass: action=fatal
+
+#=======================================================================
+# DEBUGGER_LOG:
+# Give the path of the log file you'd like Bochs to log debugger output.
+# If you really don't want it, make it /dev/null or '-'. :^(
+#
+# Examples:
+#   debugger_log: ./debugger.out
+#=======================================================================
+#debugger_log: /dev/null
+#debugger_log: debugger.out
+debugger_log: -
+
+#=======================================================================
+# COM1, COM2, COM3, COM4:
+# This defines a serial port (UART type 16550A). In the 'term' you can specify
+# a device to use as com1. This can be a real serial line, or a pty.  To use
+# a pty (under X/Unix), create two windows (xterms, usually).  One of them will
+# run bochs, and the other will act as com1. Find out the tty the com1
+# window using the `tty' command, and use that as the `dev' parameter.
+# Then do `sleep 1000000' in the com1 window to keep the shell from
+# messing with things, and run bochs in the other window.  Serial I/O to
+# com1 (port 0x3f8) will all go to the other window.
+# Other serial modes are 'null' (no input/output), 'file' (output to a file
+# specified as the 'dev' parameter), 'raw' (use the real serial port - under
+# construction for win32), 'mouse' (standard serial mouse - requires
+# mouse option setting 'type=serial' or 'type=serial_wheel') and 'socket'
+# (connect a networking socket).
+#
+# Examples:
+#   com1: enabled=1, mode=null
+#   com1: enabled=1, mode=mouse
+#   com2: enabled=1, mode=file, dev=serial.out
+#   com3: enabled=1, mode=raw, dev=com1
+#   com3: enabled=1, mode=socket, dev=localhost:8888
+#=======================================================================
+#com1: enabled=1, mode=term, dev=/dev/ttyp9
+
+
+#=======================================================================
+# PARPORT1, PARPORT2:
+# This defines a parallel (printer) port. When turned on and an output file is
+# defined the emulated printer port sends characters printed by the guest OS
+# into the output file. On some platforms a device filename can be used to
+# send the data to the real parallel port (e.g. "/dev/lp0" on Linux, "lpt1" on
+# win32 platforms).
+#
+# Examples:
+#   parport1: enabled=1, file="parport.out"
+#   parport2: enabled=1, file="/dev/lp0"
+#   parport1: enabled=0
+#=======================================================================
+parport1: enabled=1, file="/dev/stdout"
+
+#=======================================================================
+# SB16:
+# This defines the SB16 sound emulation. It can have several of the
+# following properties.
+# All properties are in the format sb16: property=value
+# midi: The filename is where the midi data is sent. This can be a
+#       device or just a file if you want to record the midi data.
+# midimode:
+#      0=no data
+#      1=output to device (system dependent. midi denotes the device driver)
+#      2=SMF file output, including headers
+#      3=output the midi data stream to the file (no midi headers and no
+#        delta times, just command and data bytes)
+# wave: This is the device/file where wave output is stored
+# wavemode:
+#      0=no data
+#      1=output to device (system dependent. wave denotes the device driver)
+#      2=VOC file output, incl. headers
+#      3=output the raw wave stream to the file
+# log:  The file to write the sb16 emulator messages to.
+# loglevel:
+#      0=no log
+#      1=resource changes, midi program and bank changes
+#      2=severe errors
+#      3=all errors
+#      4=all errors plus all port accesses
+#      5=all errors and port accesses plus a lot of extra info
+# dmatimer:
+#      microseconds per second for a DMA cycle.  Make it smaller to fix
+#      non-continuous sound.  750000 is usually a good value.  This needs a
+#      reasonably correct setting for the IPS parameter of the CPU option.
+#
+# For an example look at the next line:
+#=======================================================================
+
+#sb16: midimode=1, midi=/dev/midi00, wavemode=1, wave=/dev/dsp, loglevel=2, log=sb16.log, dmatimer=600000
+
+#=======================================================================
+# VGA_UPDATE_INTERVAL:
+# Video memory is scanned for updates and screen updated every so many
+# virtual seconds.  The default is 40000, about 25Hz. Keep in mind that
+# you must tweak the 'cpu: ips=N' directive to be as close to the number
+# of emulated instructions-per-second your workstation can do, for this
+# to be accurate.
+#
+# Examples:
+#   vga_update_interval: 250000
+#=======================================================================
+vga_update_interval: 300000
+
+# using for Winstone '98 tests
+#vga_update_interval:  100000
+
+#=======================================================================
+# KEYBOARD_SERIAL_DELAY:
+# Approximate time in microseconds that it takes one character to
+# be transfered from the keyboard to controller over the serial path.
+# Examples:
+#   keyboard_serial_delay: 200
+#=======================================================================
+keyboard_serial_delay: 250
+
+#=======================================================================
+# KEYBOARD_PASTE_DELAY:
+# Approximate time in microseconds between attempts to paste
+# characters to the keyboard controller. This leaves time for the
+# guest os to deal with the flow of characters.  The ideal setting
+# depends on how your operating system processes characters.  The
+# default of 100000 usec (.1 seconds) was chosen because it works 
+# consistently in Windows.
+#
+# If your OS is losing characters during a paste, increase the paste
+# delay until it stops losing characters.
+#
+# Examples:
+#   keyboard_paste_delay: 100000
+#=======================================================================
+keyboard_paste_delay: 100000
+
+#=======================================================================
+# MOUSE: 
+# This option prevents Bochs from creating mouse "events" unless a mouse
+# is  enabled. The hardware emulation itself is not disabled by this.
+# You can turn the mouse on by setting enabled to 1, or turn it off by
+# setting enabled to 0. Unless you have a particular reason for enabling
+# the mouse by default, it is recommended that you leave it off.
+# You can also toggle the mouse usage at runtime (control key + middle
+# mouse button on X11, SDL, wxWidgets and Win32).
+# With the mouse type option you can select the type of mouse to emulate.
+# The default value is 'ps2'. The other choices are 'imps2' (wheel mouse
+# on PS/2), 'serial', 'serial_wheel' (one com port requires setting
+# 'mode=mouse') and 'usb' (3-button mouse - one of the USB ports must be
+# connected with the 'mouse' device - requires PCI and USB support).
+#
+# Examples:
+#   mouse: enabled=1
+#   mouse: enabled=1, type=imps2
+#   mouse: enabled=1, type=serial
+#   mouse: enabled=0
+#=======================================================================
+mouse: enabled=0
+
+#=======================================================================
+# private_colormap: Request that the GUI create and use it's own
+#                   non-shared colormap.  This colormap will be used
+#                   when in the bochs window.  If not enabled, a
+#                   shared colormap scheme may be used.  Not implemented
+#                   on all GUI's.
+#
+# Examples:
+#   private_colormap: enabled=1
+#   private_colormap: enabled=0
+#=======================================================================
+private_colormap: enabled=0
+
+#=======================================================================
+# fullscreen: ONLY IMPLEMENTED ON AMIGA
+#             Request that Bochs occupy the entire screen instead of a 
+#             window.
+#
+# Examples:
+#   fullscreen: enabled=0
+#   fullscreen: enabled=1
+#=======================================================================
+#fullscreen: enabled=0
+#screenmode: name="sample"
+
+#=======================================================================
+# ne2k: NE2000 compatible ethernet adapter
+#
+# Examples:
+# ne2k: ioaddr=IOADDR, irq=IRQ, mac=MACADDR, ethmod=MODULE, ethdev=DEVICE, script=SCRIPT
+#
+# ioaddr, irq: You probably won't need to change ioaddr and irq, unless there
+# are IRQ conflicts.
+#
+# mac: The MAC address MUST NOT match the address of any machine on the net.
+# Also, the first byte must be an even number (bit 0 set means a multicast
+# address), and you cannot use ff:ff:ff:ff:ff:ff because that's the broadcast
+# address.  For the ethertap module, you must use fe:fd:00:00:00:01.  There may
+# be other restrictions too.  To be safe, just use the b0:c4... address.
+#
+# ethdev: The ethdev value is the name of the network interface on your host
+# platform.  On UNIX machines, you can get the name by running ifconfig.  On
+# Windows machines, you must run niclist to get the name of the ethdev.
+# Niclist source code is in misc/niclist.c and it is included in Windows 
+# binary releases.
+#
+# script: The script value is optional, and is the name of a script that 
+# is executed after bochs initialize the network interface. You can use 
+# this script to configure this network interface, or enable masquerading.
+# This is mainly useful for the tun/tap devices that only exist during
+# Bochs execution. The network interface name is supplied to the script
+# as first parameter
+#
+# If you don't want to make connections to any physical networks,
+# you can use the following 'ethmod's to simulate a virtual network.
+#   null: All packets are discarded, but logged to a few files.
+#   arpback: ARP is simulated. Disabled by default.
+#   vde:  Virtual Distributed Ethernet
+#   vnet: ARP, ICMP-echo(ping), DHCP and read/write TFTP are simulated.
+#         The virtual host uses 192.168.10.1.
+#         DHCP assigns 192.168.10.2 to the guest.
+#         TFTP uses the ethdev value for the root directory and doesn't
+#         overwrite files.
+#
+#=======================================================================
+# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=fbsd, ethdev=en0 #macosx
+# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=xl0
+# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
+# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=win32, ethdev=MYCARD
+# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tap, ethdev=tap0
+# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tuntap, ethdev=/dev/net/tun0, script=./tunconfig
+# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=null, ethdev=eth0
+# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=vde, ethdev="/tmp/vde.ctl"
+# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=vnet, ethdev="c:/temp"
+
+#=======================================================================
+# KEYBOARD_MAPPING:
+# This enables a remap of a physical localized keyboard to a 
+# virtualized us keyboard, as the PC architecture expects.
+# If enabled, the keymap file must be specified.
+# 
+# Examples:
+#   keyboard_mapping: enabled=1, map=gui/keymaps/x11-pc-de.map
+#=======================================================================
+keyboard_mapping: enabled=0, map=
+
+#=======================================================================
+# KEYBOARD_TYPE:
+# Type of keyboard return by a "identify keyboard" command to the
+# keyboard controler. It must be one of "xt", "at" or "mf".
+# Defaults to "mf". It should be ok for almost everybody. A known
+# exception is french macs, that do have a "at"-like keyboard.
+#
+# Examples:
+#   keyboard_type: mf
+#=======================================================================
+#keyboard_type: mf
+
+#=======================================================================
+# USER_SHORTCUT:
+# This defines the keyboard shortcut to be sent when you press the "user"
+# button in the headerbar. The shortcut string is a combination of maximum
+# 3 key names (listed below) separated with a '-' character. The old-style
+# syntax (without the '-') still works for the key combinations supported
+# in Bochs 2.2.1.
+# Valid key names:
+# "alt", "bksl", "bksp", "ctrl", "del", "down", "end", "enter", "esc",
+# "f1", ... "f12", "home", "ins", "left", "menu", "minus", "pgdwn", "pgup",
+# "plus", "right", "shift", "space", "tab", "up", and "win".
+#
+# Example:
+#   user_shortcut: keys=ctrl-alt-del
+#=======================================================================
+#user_shortcut: keys=ctrl-alt-del
+
+#=======================================================================
+# I440FXSUPPORT:
+# This option controls the presence of the i440FX PCI chipset. You can
+# also specify the devices connected to PCI slots. Up to 5 slots are
+# available now. These devices are currently supported: ne2k, pcivga,
+# pcidev and pcipnic. If Bochs is compiled with Cirrus SVGA support
+# you'll have the additional choice 'cirrus'.
+#
+# Example:
+#   i440fxsupport: enabled=1, slot1=pcivga, slot2=ne2k
+#=======================================================================
+#i440fxsupport: enabled=1
+
+#=======================================================================
+# USB1:
+# This option controls the presence of the USB root hub which is a part
+# of the i440FX PCI chipset. With the portX option you can connect devices
+# to the hub (currently supported: 'mouse' and 'keypad'). If you connect
+# the mouse to one of the ports and use the mouse option 'type=usb' you'll
+# have a 3-button USB mouse.
+#
+# Example:
+#   usb1: enabled=1, port1=mouse, port2=keypad
+#=======================================================================
+#usb1: enabled=1
+
+#=======================================================================
+# CMOSIMAGE:
+# This defines image file that can be loaded into the CMOS RAM at startup.
+# The rtc_init parameter controls whether initialize the RTC with values stored
+# in the image. By default the time0 argument given to the clock option is used.
+# With 'rtc_init=image' the image is the source for the initial time.
+#
+# Example:
+#   cmosimage: file=cmos.img, rtc_init=image
+#=======================================================================
+#cmosimage: file=cmos.img, rtc_init=time0
+
+#=======================================================================
+# other stuff
+#=======================================================================
+#magic_break: enabled=1
+#load32bitOSImage: os=nullkernel, path=../kernel.img, iolog=../vga_io.log
+#load32bitOSImage: os=linux, path=../linux.img, iolog=../vga_io.log, initrd=../initrd.img
+#text_snapshot_check: enable
+
+#-------------------------
+# PCI host device mapping
+#-------------------------
+#pcidev: vendor=0x1234, device=0x5678
+
+#=======================================================================
+# GDBSTUB:
+# Enable GDB stub. See user documentation for details.
+# Default value is enabled=0.
+#=======================================================================
+#gdbstub: enabled=0, port=1234, text_base=0, data_base=0, bss_base=0
+
+#=======================================================================
+# IPS:
+# The IPS directive is DEPRECATED. Use the parameter IPS of the CPU
+# directive instead.
+#=======================================================================
+#ips: 10000000
+
+#=======================================================================
+# for Macintosh, use the style of pathnames in the following
+# examples.
+#
+# vgaromimage: :bios:VGABIOS-elpin-2.40
+# romimage: file=:bios:BIOS-bochs-latest, address=0xf0000
+# floppya: 1_44=[fd:], status=inserted
+#=======================================================================
diff --git a/xv6-public/echo.c b/xv6-public/echo.c
new file mode 100644
index 0000000..806dee0
--- /dev/null
+++ b/xv6-public/echo.c
@@ -0,0 +1,13 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int
+main(int argc, char *argv[])
+{
+  int i;
+
+  for(i = 1; i < argc; i++)
+    printf(1, "%s%s", argv[i], i+1 < argc ? " " : "\n");
+  exit();
+}
diff --git a/xv6-public/elf.h b/xv6-public/elf.h
new file mode 100644
index 0000000..d16c967
--- /dev/null
+++ b/xv6-public/elf.h
@@ -0,0 +1,42 @@
+// Format of an ELF executable file
+
+#define ELF_MAGIC 0x464C457FU  // "\x7FELF" in little endian
+
+// File header
+struct elfhdr {
+  uint magic;  // must equal ELF_MAGIC
+  uchar elf[12];
+  ushort type;
+  ushort machine;
+  uint version;
+  uint entry;
+  uint phoff;
+  uint shoff;
+  uint flags;
+  ushort ehsize;
+  ushort phentsize;
+  ushort phnum;
+  ushort shentsize;
+  ushort shnum;
+  ushort shstrndx;
+};
+
+// Program section header
+struct proghdr {
+  uint type;
+  uint off;
+  uint vaddr;
+  uint paddr;
+  uint filesz;
+  uint memsz;
+  uint flags;
+  uint align;
+};
+
+// Values for Proghdr type
+#define ELF_PROG_LOAD           1
+
+// Flag bits for Proghdr flags
+#define ELF_PROG_FLAG_EXEC      1
+#define ELF_PROG_FLAG_WRITE     2
+#define ELF_PROG_FLAG_READ      4
diff --git a/xv6-public/entry.S b/xv6-public/entry.S
new file mode 100644
index 0000000..bc79bab
--- /dev/null
+++ b/xv6-public/entry.S
@@ -0,0 +1,68 @@
+# The xv6 kernel starts executing in this file. This file is linked with
+# the kernel C code, so it can refer to kernel symbols such as main().
+# The boot block (bootasm.S and bootmain.c) jumps to entry below.
+        
+# Multiboot header, for multiboot boot loaders like GNU Grub.
+# http://www.gnu.org/software/grub/manual/multiboot/multiboot.html
+#
+# Using GRUB 2, you can boot xv6 from a file stored in a
+# Linux file system by copying kernel or kernelmemfs to /boot
+# and then adding this menu entry:
+#
+# menuentry "xv6" {
+# 	insmod ext2
+# 	set root='(hd0,msdos1)'
+# 	set kernel='/boot/kernel'
+# 	echo "Loading ${kernel}..."
+# 	multiboot ${kernel} ${kernel}
+# 	boot
+# }
+
+#include "asm.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "param.h"
+
+# Multiboot header.  Data to direct multiboot loader.
+.p2align 2
+.text
+.globl multiboot_header
+multiboot_header:
+  #define magic 0x1badb002
+  #define flags 0
+  .long magic
+  .long flags
+  .long (-magic-flags)
+
+# By convention, the _start symbol specifies the ELF entry point.
+# Since we haven't set up virtual memory yet, our entry point is
+# the physical address of 'entry'.
+.globl _start
+_start = V2P_WO(entry)
+
+# Entering xv6 on boot processor, with paging off.
+.globl entry
+entry:
+  # Turn on page size extension for 4Mbyte pages
+  movl    %cr4, %eax
+  orl     $(CR4_PSE), %eax
+  movl    %eax, %cr4
+  # Set page directory
+  movl    $(V2P_WO(entrypgdir)), %eax
+  movl    %eax, %cr3
+  # Turn on paging.
+  movl    %cr0, %eax
+  orl     $(CR0_PG|CR0_WP), %eax
+  movl    %eax, %cr0
+
+  # Set up the stack pointer.
+  movl $(stack + KSTACKSIZE), %esp
+
+  # Jump to main(), and switch to executing at
+  # high addresses. The indirect call is needed because
+  # the assembler produces a PC-relative instruction
+  # for a direct jump.
+  mov $main, %eax
+  jmp *%eax
+
+.comm stack, KSTACKSIZE
diff --git a/xv6-public/entryother.S b/xv6-public/entryother.S
new file mode 100644
index 0000000..a3b6dc2
--- /dev/null
+++ b/xv6-public/entryother.S
@@ -0,0 +1,93 @@
+#include "asm.h"
+#include "memlayout.h"
+#include "mmu.h"
+	
+# Each non-boot CPU ("AP") is started up in response to a STARTUP
+# IPI from the boot CPU.  Section B.4.2 of the Multi-Processor
+# Specification says that the AP will start in real mode with CS:IP
+# set to XY00:0000, where XY is an 8-bit value sent with the
+# STARTUP. Thus this code must start at a 4096-byte boundary.
+#
+# Because this code sets DS to zero, it must sit
+# at an address in the low 2^16 bytes.
+#
+# Startothers (in main.c) sends the STARTUPs one at a time.
+# It copies this code (start) at 0x7000.  It puts the address of
+# a newly allocated per-core stack in start-4,the address of the
+# place to jump to (mpenter) in start-8, and the physical address
+# of entrypgdir in start-12.
+#
+# This code combines elements of bootasm.S and entry.S.
+
+.code16           
+.globl start
+start:
+  cli            
+
+  # Zero data segment registers DS, ES, and SS.
+  xorw    %ax,%ax
+  movw    %ax,%ds
+  movw    %ax,%es
+  movw    %ax,%ss
+
+  # Switch from real to protected mode.  Use a bootstrap GDT that makes
+  # virtual addresses map directly to physical addresses so that the
+  # effective memory map doesn't change during the transition.
+  lgdt    gdtdesc
+  movl    %cr0, %eax
+  orl     $CR0_PE, %eax
+  movl    %eax, %cr0
+
+  # Complete the transition to 32-bit protected mode by using a long jmp
+  # to reload %cs and %eip.  The segment descriptors are set up with no
+  # translation, so that the mapping is still the identity mapping.
+  ljmpl    $(SEG_KCODE<<3), $(start32)
+
+//PAGEBREAK!
+.code32  # Tell assembler to generate 32-bit code now.
+start32:
+  # Set up the protected-mode data segment registers
+  movw    $(SEG_KDATA<<3), %ax    # Our data segment selector
+  movw    %ax, %ds                # -> DS: Data Segment
+  movw    %ax, %es                # -> ES: Extra Segment
+  movw    %ax, %ss                # -> SS: Stack Segment
+  movw    $0, %ax                 # Zero segments not ready for use
+  movw    %ax, %fs                # -> FS
+  movw    %ax, %gs                # -> GS
+
+  # Turn on page size extension for 4Mbyte pages
+  movl    %cr4, %eax
+  orl     $(CR4_PSE), %eax
+  movl    %eax, %cr4
+  # Use entrypgdir as our initial page table
+  movl    (start-12), %eax
+  movl    %eax, %cr3
+  # Turn on paging.
+  movl    %cr0, %eax
+  orl     $(CR0_PE|CR0_PG|CR0_WP), %eax
+  movl    %eax, %cr0
+
+  # Switch to the stack allocated by startothers()
+  movl    (start-4), %esp
+  # Call mpenter()
+  call	 *(start-8)
+
+  movw    $0x8a00, %ax
+  movw    %ax, %dx
+  outw    %ax, %dx
+  movw    $0x8ae0, %ax
+  outw    %ax, %dx
+spin:
+  jmp     spin
+
+.p2align 2
+gdt:
+  SEG_NULLASM
+  SEG_ASM(STA_X|STA_R, 0, 0xffffffff)
+  SEG_ASM(STA_W, 0, 0xffffffff)
+
+
+gdtdesc:
+  .word   (gdtdesc - gdt - 1)
+  .long   gdt
+
diff --git a/xv6-public/exec.c b/xv6-public/exec.c
new file mode 100644
index 0000000..b40134f
--- /dev/null
+++ b/xv6-public/exec.c
@@ -0,0 +1,114 @@
+#include "types.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "defs.h"
+#include "x86.h"
+#include "elf.h"
+
+int
+exec(char *path, char **argv)
+{
+  char *s, *last;
+  int i, off;
+  uint argc, sz, sp, ustack[3+MAXARG+1];
+  struct elfhdr elf;
+  struct inode *ip;
+  struct proghdr ph;
+  pde_t *pgdir, *oldpgdir;
+  struct proc *curproc = myproc();
+
+  begin_op();
+
+  if((ip = namei(path)) == 0){
+    end_op();
+    cprintf("exec: fail\n");
+    return -1;
+  }
+  ilock(ip);
+  pgdir = 0;
+
+  // Check ELF header
+  if(readi(ip, (char*)&elf, 0, sizeof(elf)) != sizeof(elf))
+    goto bad;
+  if(elf.magic != ELF_MAGIC)
+    goto bad;
+
+  if((pgdir = setupkvm()) == 0)
+    goto bad;
+
+  // Load program into memory.
+  sz = 0;
+  for(i=0, off=elf.phoff; i<elf.phnum; i++, off+=sizeof(ph)){
+    if(readi(ip, (char*)&ph, off, sizeof(ph)) != sizeof(ph))
+      goto bad;
+    if(ph.type != ELF_PROG_LOAD)
+      continue;
+    if(ph.memsz < ph.filesz)
+      goto bad;
+    if(ph.vaddr + ph.memsz < ph.vaddr)
+      goto bad;
+    if((sz = allocuvm(pgdir, sz, ph.vaddr + ph.memsz)) == 0)
+      goto bad;
+    if(ph.vaddr % PGSIZE != 0)
+      goto bad;
+    if(loaduvm(pgdir, (char*)ph.vaddr, ip, ph.off, ph.filesz) < 0)
+      goto bad;
+  }
+  iunlockput(ip);
+  end_op();
+  ip = 0;
+
+  // Allocate two pages at the next page boundary.
+  // Make the first inaccessible.  Use the second as the user stack.
+  sz = PGROUNDUP(sz);
+  if((sz = allocuvm(pgdir, sz, sz + 2*PGSIZE)) == 0)
+    goto bad;
+  clearpteu(pgdir, (char*)(sz - 2*PGSIZE));
+  sp = sz;
+
+  // Push argument strings, prepare rest of stack in ustack.
+  for(argc = 0; argv[argc]; argc++) {
+    if(argc >= MAXARG)
+      goto bad;
+    sp = (sp - (strlen(argv[argc]) + 1)) & ~3;
+    if(copyout(pgdir, sp, argv[argc], strlen(argv[argc]) + 1) < 0)
+      goto bad;
+    ustack[3+argc] = sp;
+  }
+  ustack[3+argc] = 0;
+
+  ustack[0] = 0xffffffff;  // fake return PC
+  ustack[1] = argc;
+  ustack[2] = sp - (argc+1)*4;  // argv pointer
+
+  sp -= (3+argc+1) * 4;
+  if(copyout(pgdir, sp, ustack, (3+argc+1)*4) < 0)
+    goto bad;
+
+  // Save program name for debugging.
+  for(last=s=path; *s; s++)
+    if(*s == '/')
+      last = s+1;
+  safestrcpy(curproc->name, last, sizeof(curproc->name));
+
+  // Commit to the user image.
+  oldpgdir = curproc->pgdir;
+  curproc->pgdir = pgdir;
+  curproc->sz = sz;
+  curproc->tf->eip = elf.entry;  // main
+  curproc->tf->esp = sp;
+  switchuvm(curproc);
+  freevm(oldpgdir);
+  return 0;
+
+ bad:
+  if(pgdir)
+    freevm(pgdir);
+  if(ip){
+    iunlockput(ip);
+    end_op();
+  }
+  return -1;
+}
diff --git a/xv6-public/fcntl.h b/xv6-public/fcntl.h
new file mode 100644
index 0000000..d565483
--- /dev/null
+++ b/xv6-public/fcntl.h
@@ -0,0 +1,4 @@
+#define O_RDONLY  0x000
+#define O_WRONLY  0x001
+#define O_RDWR    0x002
+#define O_CREATE  0x200
diff --git a/xv6-public/file.c b/xv6-public/file.c
new file mode 100644
index 0000000..24b32c2
--- /dev/null
+++ b/xv6-public/file.c
@@ -0,0 +1,157 @@
+//
+// File descriptors
+//
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "fs.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "file.h"
+
+struct devsw devsw[NDEV];
+struct {
+  struct spinlock lock;
+  struct file file[NFILE];
+} ftable;
+
+void
+fileinit(void)
+{
+  initlock(&ftable.lock, "ftable");
+}
+
+// Allocate a file structure.
+struct file*
+filealloc(void)
+{
+  struct file *f;
+
+  acquire(&ftable.lock);
+  for(f = ftable.file; f < ftable.file + NFILE; f++){
+    if(f->ref == 0){
+      f->ref = 1;
+      release(&ftable.lock);
+      return f;
+    }
+  }
+  release(&ftable.lock);
+  return 0;
+}
+
+// Increment ref count for file f.
+struct file*
+filedup(struct file *f)
+{
+  acquire(&ftable.lock);
+  if(f->ref < 1)
+    panic("filedup");
+  f->ref++;
+  release(&ftable.lock);
+  return f;
+}
+
+// Close file f.  (Decrement ref count, close when reaches 0.)
+void
+fileclose(struct file *f)
+{
+  struct file ff;
+
+  acquire(&ftable.lock);
+  if(f->ref < 1)
+    panic("fileclose");
+  if(--f->ref > 0){
+    release(&ftable.lock);
+    return;
+  }
+  ff = *f;
+  f->ref = 0;
+  f->type = FD_NONE;
+  release(&ftable.lock);
+
+  if(ff.type == FD_PIPE)
+    pipeclose(ff.pipe, ff.writable);
+  else if(ff.type == FD_INODE){
+    begin_op();
+    iput(ff.ip);
+    end_op();
+  }
+}
+
+// Get metadata about file f.
+int
+filestat(struct file *f, struct stat *st)
+{
+  if(f->type == FD_INODE){
+    ilock(f->ip);
+    stati(f->ip, st);
+    iunlock(f->ip);
+    return 0;
+  }
+  return -1;
+}
+
+// Read from file f.
+int
+fileread(struct file *f, char *addr, int n)
+{
+  int r;
+
+  if(f->readable == 0)
+    return -1;
+  if(f->type == FD_PIPE)
+    return piperead(f->pipe, addr, n);
+  if(f->type == FD_INODE){
+    ilock(f->ip);
+    if((r = readi(f->ip, addr, f->off, n)) > 0)
+      f->off += r;
+    iunlock(f->ip);
+    return r;
+  }
+  panic("fileread");
+}
+
+//PAGEBREAK!
+// Write to file f.
+int
+filewrite(struct file *f, char *addr, int n)
+{
+  int r;
+
+  if(f->writable == 0)
+    return -1;
+  if(f->type == FD_PIPE)
+    return pipewrite(f->pipe, addr, n);
+  if(f->type == FD_INODE){
+    // write a few blocks at a time to avoid exceeding
+    // the maximum log transaction size, including
+    // i-node, indirect block, allocation blocks,
+    // and 2 blocks of slop for non-aligned writes.
+    // this really belongs lower down, since writei()
+    // might be writing a device like the console.
+    int max = ((MAXOPBLOCKS-1-1-2) / 2) * 512;
+    int i = 0;
+    while(i < n){
+      int n1 = n - i;
+      if(n1 > max)
+        n1 = max;
+
+      begin_op();
+      ilock(f->ip);
+      if ((r = writei(f->ip, addr + i, f->off, n1)) > 0)
+        f->off += r;
+      iunlock(f->ip);
+      end_op();
+
+      if(r < 0)
+        break;
+      if(r != n1)
+        panic("short filewrite");
+      i += r;
+    }
+    return i == n ? n : -1;
+  }
+  panic("filewrite");
+}
+
diff --git a/xv6-public/file.h b/xv6-public/file.h
new file mode 100644
index 0000000..0990c82
--- /dev/null
+++ b/xv6-public/file.h
@@ -0,0 +1,37 @@
+struct file {
+  enum { FD_NONE, FD_PIPE, FD_INODE } type;
+  int ref; // reference count
+  char readable;
+  char writable;
+  struct pipe *pipe;
+  struct inode *ip;
+  uint off;
+};
+
+
+// in-memory copy of an inode
+struct inode {
+  uint dev;           // Device number
+  uint inum;          // Inode number
+  int ref;            // Reference count
+  struct sleeplock lock; // protects everything below here
+  int valid;          // inode has been read from disk?
+
+  short type;         // copy of disk inode
+  short major;
+  short minor;
+  short nlink;
+  uint size;
+  uint addrs[NDIRECT+1];
+};
+
+// table mapping major device number to
+// device functions
+struct devsw {
+  int (*read)(struct inode*, char*, int);
+  int (*write)(struct inode*, char*, int);
+};
+
+extern struct devsw devsw[];
+
+#define CONSOLE 1
diff --git a/xv6-public/forktest.c b/xv6-public/forktest.c
new file mode 100644
index 0000000..8bc984d
--- /dev/null
+++ b/xv6-public/forktest.c
@@ -0,0 +1,56 @@
+// Test that fork fails gracefully.
+// Tiny executable so that the limit can be filling the proc table.
+
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+#define N  1000
+
+void
+printf(int fd, const char *s, ...)
+{
+  write(fd, s, strlen(s));
+}
+
+void
+forktest(void)
+{
+  int n, pid;
+
+  printf(1, "fork test\n");
+
+  for(n=0; n<N; n++){
+    pid = fork();
+    if(pid < 0)
+      break;
+    if(pid == 0)
+      exit();
+  }
+
+  if(n == N){
+    printf(1, "fork claimed to work N times!\n", N);
+    exit();
+  }
+
+  for(; n > 0; n--){
+    if(wait() < 0){
+      printf(1, "wait stopped early\n");
+      exit();
+    }
+  }
+
+  if(wait() != -1){
+    printf(1, "wait got too many\n");
+    exit();
+  }
+
+  printf(1, "fork test OK\n");
+}
+
+int
+main(void)
+{
+  forktest();
+  exit();
+}
diff --git a/xv6-public/fs.c b/xv6-public/fs.c
new file mode 100644
index 0000000..feb59fe
--- /dev/null
+++ b/xv6-public/fs.c
@@ -0,0 +1,671 @@
+// File system implementation.  Five layers:
+//   + Blocks: allocator for raw disk blocks.
+//   + Log: crash recovery for multi-step updates.
+//   + Files: inode allocator, reading, writing, metadata.
+//   + Directories: inode with special contents (list of other inodes!)
+//   + Names: paths like /usr/rtm/xv6/fs.c for convenient naming.
+//
+// This file contains the low-level file system manipulation
+// routines.  The (higher-level) system call implementations
+// are in sysfile.c.
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "stat.h"
+#include "mmu.h"
+#include "proc.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "fs.h"
+#include "buf.h"
+#include "file.h"
+
+#define min(a, b) ((a) < (b) ? (a) : (b))
+static void itrunc(struct inode*);
+// there should be one superblock per disk device, but we run with
+// only one device
+struct superblock sb; 
+
+// Read the super block.
+void
+readsb(int dev, struct superblock *sb)
+{
+  struct buf *bp;
+
+  bp = bread(dev, 1);
+  memmove(sb, bp->data, sizeof(*sb));
+  brelse(bp);
+}
+
+// Zero a block.
+static void
+bzero(int dev, int bno)
+{
+  struct buf *bp;
+
+  bp = bread(dev, bno);
+  memset(bp->data, 0, BSIZE);
+  log_write(bp);
+  brelse(bp);
+}
+
+// Blocks.
+
+// Allocate a zeroed disk block.
+static uint
+balloc(uint dev)
+{
+  int b, bi, m;
+  struct buf *bp;
+
+  bp = 0;
+  for(b = 0; b < sb.size; b += BPB){
+    bp = bread(dev, BBLOCK(b, sb));
+    for(bi = 0; bi < BPB && b + bi < sb.size; bi++){
+      m = 1 << (bi % 8);
+      if((bp->data[bi/8] & m) == 0){  // Is block free?
+        bp->data[bi/8] |= m;  // Mark block in use.
+        log_write(bp);
+        brelse(bp);
+        bzero(dev, b + bi);
+        return b + bi;
+      }
+    }
+    brelse(bp);
+  }
+  panic("balloc: out of blocks");
+}
+
+// Free a disk block.
+static void
+bfree(int dev, uint b)
+{
+  struct buf *bp;
+  int bi, m;
+
+  readsb(dev, &sb);
+  bp = bread(dev, BBLOCK(b, sb));
+  bi = b % BPB;
+  m = 1 << (bi % 8);
+  if((bp->data[bi/8] & m) == 0)
+    panic("freeing free block");
+  bp->data[bi/8] &= ~m;
+  log_write(bp);
+  brelse(bp);
+}
+
+// Inodes.
+//
+// An inode describes a single unnamed file.
+// The inode disk structure holds metadata: the file's type,
+// its size, the number of links referring to it, and the
+// list of blocks holding the file's content.
+//
+// The inodes are laid out sequentially on disk at
+// sb.startinode. Each inode has a number, indicating its
+// position on the disk.
+//
+// The kernel keeps a cache of in-use inodes in memory
+// to provide a place for synchronizing access
+// to inodes used by multiple processes. The cached
+// inodes include book-keeping information that is
+// not stored on disk: ip->ref and ip->valid.
+//
+// An inode and its in-memory representation go through a
+// sequence of states before they can be used by the
+// rest of the file system code.
+//
+// * Allocation: an inode is allocated if its type (on disk)
+//   is non-zero. ialloc() allocates, and iput() frees if
+//   the reference and link counts have fallen to zero.
+//
+// * Referencing in cache: an entry in the inode cache
+//   is free if ip->ref is zero. Otherwise ip->ref tracks
+//   the number of in-memory pointers to the entry (open
+//   files and current directories). iget() finds or
+//   creates a cache entry and increments its ref; iput()
+//   decrements ref.
+//
+// * Valid: the information (type, size, &c) in an inode
+//   cache entry is only correct when ip->valid is 1.
+//   ilock() reads the inode from
+//   the disk and sets ip->valid, while iput() clears
+//   ip->valid if ip->ref has fallen to zero.
+//
+// * Locked: file system code may only examine and modify
+//   the information in an inode and its content if it
+//   has first locked the inode.
+//
+// Thus a typical sequence is:
+//   ip = iget(dev, inum)
+//   ilock(ip)
+//   ... examine and modify ip->xxx ...
+//   iunlock(ip)
+//   iput(ip)
+//
+// ilock() is separate from iget() so that system calls can
+// get a long-term reference to an inode (as for an open file)
+// and only lock it for short periods (e.g., in read()).
+// The separation also helps avoid deadlock and races during
+// pathname lookup. iget() increments ip->ref so that the inode
+// stays cached and pointers to it remain valid.
+//
+// Many internal file system functions expect the caller to
+// have locked the inodes involved; this lets callers create
+// multi-step atomic operations.
+//
+// The icache.lock spin-lock protects the allocation of icache
+// entries. Since ip->ref indicates whether an entry is free,
+// and ip->dev and ip->inum indicate which i-node an entry
+// holds, one must hold icache.lock while using any of those fields.
+//
+// An ip->lock sleep-lock protects all ip-> fields other than ref,
+// dev, and inum.  One must hold ip->lock in order to
+// read or write that inode's ip->valid, ip->size, ip->type, &c.
+
+struct {
+  struct spinlock lock;
+  struct inode inode[NINODE];
+} icache;
+
+void
+iinit(int dev)
+{
+  int i = 0;
+  
+  initlock(&icache.lock, "icache");
+  for(i = 0; i < NINODE; i++) {
+    initsleeplock(&icache.inode[i].lock, "inode");
+  }
+
+  readsb(dev, &sb);
+  cprintf("sb: size %d nblocks %d ninodes %d nlog %d logstart %d\
+ inodestart %d bmap start %d\n", sb.size, sb.nblocks,
+          sb.ninodes, sb.nlog, sb.logstart, sb.inodestart,
+          sb.bmapstart);
+}
+
+static struct inode* iget(uint dev, uint inum);
+
+//PAGEBREAK!
+// Allocate an inode on device dev.
+// Mark it as allocated by  giving it type type.
+// Returns an unlocked but allocated and referenced inode.
+struct inode*
+ialloc(uint dev, short type)
+{
+  int inum;
+  struct buf *bp;
+  struct dinode *dip;
+
+  for(inum = 1; inum < sb.ninodes; inum++){
+    bp = bread(dev, IBLOCK(inum, sb));
+    dip = (struct dinode*)bp->data + inum%IPB;
+    if(dip->type == 0){  // a free inode
+      memset(dip, 0, sizeof(*dip));
+      dip->type = type;
+      log_write(bp);   // mark it allocated on the disk
+      brelse(bp);
+      return iget(dev, inum);
+    }
+    brelse(bp);
+  }
+  panic("ialloc: no inodes");
+}
+
+// Copy a modified in-memory inode to disk.
+// Must be called after every change to an ip->xxx field
+// that lives on disk, since i-node cache is write-through.
+// Caller must hold ip->lock.
+void
+iupdate(struct inode *ip)
+{
+  struct buf *bp;
+  struct dinode *dip;
+
+  bp = bread(ip->dev, IBLOCK(ip->inum, sb));
+  dip = (struct dinode*)bp->data + ip->inum%IPB;
+  dip->type = ip->type;
+  dip->major = ip->major;
+  dip->minor = ip->minor;
+  dip->nlink = ip->nlink;
+  dip->size = ip->size;
+  memmove(dip->addrs, ip->addrs, sizeof(ip->addrs));
+  log_write(bp);
+  brelse(bp);
+}
+
+// Find the inode with number inum on device dev
+// and return the in-memory copy. Does not lock
+// the inode and does not read it from disk.
+static struct inode*
+iget(uint dev, uint inum)
+{
+  struct inode *ip, *empty;
+
+  acquire(&icache.lock);
+
+  // Is the inode already cached?
+  empty = 0;
+  for(ip = &icache.inode[0]; ip < &icache.inode[NINODE]; ip++){
+    if(ip->ref > 0 && ip->dev == dev && ip->inum == inum){
+      ip->ref++;
+      release(&icache.lock);
+      return ip;
+    }
+    if(empty == 0 && ip->ref == 0)    // Remember empty slot.
+      empty = ip;
+  }
+
+  // Recycle an inode cache entry.
+  if(empty == 0)
+    panic("iget: no inodes");
+
+  ip = empty;
+  ip->dev = dev;
+  ip->inum = inum;
+  ip->ref = 1;
+  ip->valid = 0;
+  release(&icache.lock);
+
+  return ip;
+}
+
+// Increment reference count for ip.
+// Returns ip to enable ip = idup(ip1) idiom.
+struct inode*
+idup(struct inode *ip)
+{
+  acquire(&icache.lock);
+  ip->ref++;
+  release(&icache.lock);
+  return ip;
+}
+
+// Lock the given inode.
+// Reads the inode from disk if necessary.
+void
+ilock(struct inode *ip)
+{
+  struct buf *bp;
+  struct dinode *dip;
+
+  if(ip == 0 || ip->ref < 1)
+    panic("ilock");
+
+  acquiresleep(&ip->lock);
+
+  if(ip->valid == 0){
+    bp = bread(ip->dev, IBLOCK(ip->inum, sb));
+    dip = (struct dinode*)bp->data + ip->inum%IPB;
+    ip->type = dip->type;
+    ip->major = dip->major;
+    ip->minor = dip->minor;
+    ip->nlink = dip->nlink;
+    ip->size = dip->size;
+    memmove(ip->addrs, dip->addrs, sizeof(ip->addrs));
+    brelse(bp);
+    ip->valid = 1;
+    if(ip->type == 0)
+      panic("ilock: no type");
+  }
+}
+
+// Unlock the given inode.
+void
+iunlock(struct inode *ip)
+{
+  if(ip == 0 || !holdingsleep(&ip->lock) || ip->ref < 1)
+    panic("iunlock");
+
+  releasesleep(&ip->lock);
+}
+
+// Drop a reference to an in-memory inode.
+// If that was the last reference, the inode cache entry can
+// be recycled.
+// If that was the last reference and the inode has no links
+// to it, free the inode (and its content) on disk.
+// All calls to iput() must be inside a transaction in
+// case it has to free the inode.
+void
+iput(struct inode *ip)
+{
+  acquiresleep(&ip->lock);
+  if(ip->valid && ip->nlink == 0){
+    acquire(&icache.lock);
+    int r = ip->ref;
+    release(&icache.lock);
+    if(r == 1){
+      // inode has no links and no other references: truncate and free.
+      itrunc(ip);
+      ip->type = 0;
+      iupdate(ip);
+      ip->valid = 0;
+    }
+  }
+  releasesleep(&ip->lock);
+
+  acquire(&icache.lock);
+  ip->ref--;
+  release(&icache.lock);
+}
+
+// Common idiom: unlock, then put.
+void
+iunlockput(struct inode *ip)
+{
+  iunlock(ip);
+  iput(ip);
+}
+
+//PAGEBREAK!
+// Inode content
+//
+// The content (data) associated with each inode is stored
+// in blocks on the disk. The first NDIRECT block numbers
+// are listed in ip->addrs[].  The next NINDIRECT blocks are
+// listed in block ip->addrs[NDIRECT].
+
+// Return the disk block address of the nth block in inode ip.
+// If there is no such block, bmap allocates one.
+static uint
+bmap(struct inode *ip, uint bn)
+{
+  uint addr, *a;
+  struct buf *bp;
+
+  if(bn < NDIRECT){
+    if((addr = ip->addrs[bn]) == 0)
+      ip->addrs[bn] = addr = balloc(ip->dev);
+    return addr;
+  }
+  bn -= NDIRECT;
+
+  if(bn < NINDIRECT){
+    // Load indirect block, allocating if necessary.
+    if((addr = ip->addrs[NDIRECT]) == 0)
+      ip->addrs[NDIRECT] = addr = balloc(ip->dev);
+    bp = bread(ip->dev, addr);
+    a = (uint*)bp->data;
+    if((addr = a[bn]) == 0){
+      a[bn] = addr = balloc(ip->dev);
+      log_write(bp);
+    }
+    brelse(bp);
+    return addr;
+  }
+
+  panic("bmap: out of range");
+}
+
+// Truncate inode (discard contents).
+// Only called when the inode has no links
+// to it (no directory entries referring to it)
+// and has no in-memory reference to it (is
+// not an open file or current directory).
+static void
+itrunc(struct inode *ip)
+{
+  int i, j;
+  struct buf *bp;
+  uint *a;
+
+  for(i = 0; i < NDIRECT; i++){
+    if(ip->addrs[i]){
+      bfree(ip->dev, ip->addrs[i]);
+      ip->addrs[i] = 0;
+    }
+  }
+
+  if(ip->addrs[NDIRECT]){
+    bp = bread(ip->dev, ip->addrs[NDIRECT]);
+    a = (uint*)bp->data;
+    for(j = 0; j < NINDIRECT; j++){
+      if(a[j])
+        bfree(ip->dev, a[j]);
+    }
+    brelse(bp);
+    bfree(ip->dev, ip->addrs[NDIRECT]);
+    ip->addrs[NDIRECT] = 0;
+  }
+
+  ip->size = 0;
+  iupdate(ip);
+}
+
+// Copy stat information from inode.
+// Caller must hold ip->lock.
+void
+stati(struct inode *ip, struct stat *st)
+{
+  st->dev = ip->dev;
+  st->ino = ip->inum;
+  st->type = ip->type;
+  st->nlink = ip->nlink;
+  st->size = ip->size;
+}
+
+//PAGEBREAK!
+// Read data from inode.
+// Caller must hold ip->lock.
+int
+readi(struct inode *ip, char *dst, uint off, uint n)
+{
+  uint tot, m;
+  struct buf *bp;
+
+  if(ip->type == T_DEV){
+    if(ip->major < 0 || ip->major >= NDEV || !devsw[ip->major].read)
+      return -1;
+    return devsw[ip->major].read(ip, dst, n);
+  }
+
+  if(off > ip->size || off + n < off)
+    return -1;
+  if(off + n > ip->size)
+    n = ip->size - off;
+
+  for(tot=0; tot<n; tot+=m, off+=m, dst+=m){
+    bp = bread(ip->dev, bmap(ip, off/BSIZE));
+    m = min(n - tot, BSIZE - off%BSIZE);
+    memmove(dst, bp->data + off%BSIZE, m);
+    brelse(bp);
+  }
+  return n;
+}
+
+// PAGEBREAK!
+// Write data to inode.
+// Caller must hold ip->lock.
+int
+writei(struct inode *ip, char *src, uint off, uint n)
+{
+  uint tot, m;
+  struct buf *bp;
+
+  if(ip->type == T_DEV){
+    if(ip->major < 0 || ip->major >= NDEV || !devsw[ip->major].write)
+      return -1;
+    return devsw[ip->major].write(ip, src, n);
+  }
+
+  if(off > ip->size || off + n < off)
+    return -1;
+  if(off + n > MAXFILE*BSIZE)
+    return -1;
+
+  for(tot=0; tot<n; tot+=m, off+=m, src+=m){
+    bp = bread(ip->dev, bmap(ip, off/BSIZE));
+    m = min(n - tot, BSIZE - off%BSIZE);
+    memmove(bp->data + off%BSIZE, src, m);
+    log_write(bp);
+    brelse(bp);
+  }
+
+  if(n > 0 && off > ip->size){
+    ip->size = off;
+    iupdate(ip);
+  }
+  return n;
+}
+
+//PAGEBREAK!
+// Directories
+
+int
+namecmp(const char *s, const char *t)
+{
+  return strncmp(s, t, DIRSIZ);
+}
+
+// Look for a directory entry in a directory.
+// If found, set *poff to byte offset of entry.
+struct inode*
+dirlookup(struct inode *dp, char *name, uint *poff)
+{
+  uint off, inum;
+  struct dirent de;
+
+  if(dp->type != T_DIR)
+    panic("dirlookup not DIR");
+
+  for(off = 0; off < dp->size; off += sizeof(de)){
+    if(readi(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
+      panic("dirlookup read");
+    if(de.inum == 0)
+      continue;
+    if(namecmp(name, de.name) == 0){
+      // entry matches path element
+      if(poff)
+        *poff = off;
+      inum = de.inum;
+      return iget(dp->dev, inum);
+    }
+  }
+
+  return 0;
+}
+
+// Write a new directory entry (name, inum) into the directory dp.
+int
+dirlink(struct inode *dp, char *name, uint inum)
+{
+  int off;
+  struct dirent de;
+  struct inode *ip;
+
+  // Check that name is not present.
+  if((ip = dirlookup(dp, name, 0)) != 0){
+    iput(ip);
+    return -1;
+  }
+
+  // Look for an empty dirent.
+  for(off = 0; off < dp->size; off += sizeof(de)){
+    if(readi(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
+      panic("dirlink read");
+    if(de.inum == 0)
+      break;
+  }
+
+  strncpy(de.name, name, DIRSIZ);
+  de.inum = inum;
+  if(writei(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
+    panic("dirlink");
+
+  return 0;
+}
+
+//PAGEBREAK!
+// Paths
+
+// Copy the next path element from path into name.
+// Return a pointer to the element following the copied one.
+// The returned path has no leading slashes,
+// so the caller can check *path=='\0' to see if the name is the last one.
+// If no name to remove, return 0.
+//
+// Examples:
+//   skipelem("a/bb/c", name) = "bb/c", setting name = "a"
+//   skipelem("///a//bb", name) = "bb", setting name = "a"
+//   skipelem("a", name) = "", setting name = "a"
+//   skipelem("", name) = skipelem("////", name) = 0
+//
+static char*
+skipelem(char *path, char *name)
+{
+  char *s;
+  int len;
+
+  while(*path == '/')
+    path++;
+  if(*path == 0)
+    return 0;
+  s = path;
+  while(*path != '/' && *path != 0)
+    path++;
+  len = path - s;
+  if(len >= DIRSIZ)
+    memmove(name, s, DIRSIZ);
+  else {
+    memmove(name, s, len);
+    name[len] = 0;
+  }
+  while(*path == '/')
+    path++;
+  return path;
+}
+
+// Look up and return the inode for a path name.
+// If parent != 0, return the inode for the parent and copy the final
+// path element into name, which must have room for DIRSIZ bytes.
+// Must be called inside a transaction since it calls iput().
+static struct inode*
+namex(char *path, int nameiparent, char *name)
+{
+  struct inode *ip, *next;
+
+  if(*path == '/')
+    ip = iget(ROOTDEV, ROOTINO);
+  else
+    ip = idup(myproc()->cwd);
+
+  while((path = skipelem(path, name)) != 0){
+    ilock(ip);
+    if(ip->type != T_DIR){
+      iunlockput(ip);
+      return 0;
+    }
+    if(nameiparent && *path == '\0'){
+      // Stop one level early.
+      iunlock(ip);
+      return ip;
+    }
+    if((next = dirlookup(ip, name, 0)) == 0){
+      iunlockput(ip);
+      return 0;
+    }
+    iunlockput(ip);
+    ip = next;
+  }
+  if(nameiparent){
+    iput(ip);
+    return 0;
+  }
+  return ip;
+}
+
+struct inode*
+namei(char *path)
+{
+  char name[DIRSIZ];
+  return namex(path, 0, name);
+}
+
+struct inode*
+nameiparent(char *path, char *name)
+{
+  return namex(path, 1, name);
+}
diff --git a/xv6-public/fs.h b/xv6-public/fs.h
new file mode 100644
index 0000000..3214f1d
--- /dev/null
+++ b/xv6-public/fs.h
@@ -0,0 +1,57 @@
+// On-disk file system format.
+// Both the kernel and user programs use this header file.
+
+
+#define ROOTINO 1  // root i-number
+#define BSIZE 512  // block size
+
+// Disk layout:
+// [ boot block | super block | log | inode blocks |
+//                                          free bit map | data blocks]
+//
+// mkfs computes the super block and builds an initial file system. The
+// super block describes the disk layout:
+struct superblock {
+  uint size;         // Size of file system image (blocks)
+  uint nblocks;      // Number of data blocks
+  uint ninodes;      // Number of inodes.
+  uint nlog;         // Number of log blocks
+  uint logstart;     // Block number of first log block
+  uint inodestart;   // Block number of first inode block
+  uint bmapstart;    // Block number of first free map block
+};
+
+#define NDIRECT 12
+#define NINDIRECT (BSIZE / sizeof(uint))
+#define MAXFILE (NDIRECT + NINDIRECT)
+
+// On-disk inode structure
+struct dinode {
+  short type;           // File type
+  short major;          // Major device number (T_DEV only)
+  short minor;          // Minor device number (T_DEV only)
+  short nlink;          // Number of links to inode in file system
+  uint size;            // Size of file (bytes)
+  uint addrs[NDIRECT+1];   // Data block addresses
+};
+
+// Inodes per block.
+#define IPB           (BSIZE / sizeof(struct dinode))
+
+// Block containing inode i
+#define IBLOCK(i, sb)     ((i) / IPB + sb.inodestart)
+
+// Bitmap bits per block
+#define BPB           (BSIZE*8)
+
+// Block of free map containing bit for block b
+#define BBLOCK(b, sb) (b/BPB + sb.bmapstart)
+
+// Directory is a file containing a sequence of dirent structures.
+#define DIRSIZ 14
+
+struct dirent {
+  ushort inum;
+  char name[DIRSIZ];
+};
+
diff --git a/xv6-public/gdbutil b/xv6-public/gdbutil
new file mode 100644
index 0000000..e0c362f
--- /dev/null
+++ b/xv6-public/gdbutil
@@ -0,0 +1,291 @@
+# -*- gdb-script -*-
+
+# Utility functions to pretty-print x86 segment/interrupt descriptors.
+# To load this file, run "source gdbutil" in gdb.
+# printdesc and printdescs are the main entry points.
+
+# IA32 2007, Volume 3A, Table 3-2
+set $STS_T16A = 0x1
+set $STS_LDT  = 0x2
+set $STS_T16B = 0x3
+set $STS_CG16 = 0x4
+set $STS_TG   = 0x5
+set $STS_IG16 = 0x6
+set $STS_TG16 = 0x7
+set $STS_T32A = 0x9
+set $STS_T32B = 0xB
+set $STS_CG32 = 0xC
+set $STS_IG32 = 0xE
+set $STS_TG32 = 0xF
+
+define outputsts
+  while 1
+    if $arg0 == $STS_T16A
+      echo STS_T16A
+      loop_break
+    end
+    if $arg0 == $STS_LDT
+      echo STS_LDT\ 
+      loop_break
+    end
+    if $arg0 == $STS_T16B
+      echo STS_T16B
+      loop_break
+    end
+    if $arg0 == $STS_CG16
+      echo STS_CG16
+      loop_break
+    end
+    if $arg0 == $STS_TG
+      echo STS_TG\ \ 
+      loop_break
+    end
+    if $arg0 == $STS_IG16
+      echo STS_IG16
+      loop_break
+    end
+    if $arg0 == $STS_TG16
+      echo STS_TG16
+      loop_break
+    end
+    if $arg0 == $STS_T32A
+      echo STS_T32A
+      loop_break
+    end
+    if $arg0 == $STS_T32B
+      echo STS_T32B
+      loop_break
+    end
+    if $arg0 == $STS_CG32
+      echo STS_CG32
+      loop_break
+    end
+    if $arg0 == $STS_IG32
+      echo STS_IG32
+      loop_break
+    end
+    if $arg0 == $STS_TG32
+      echo STS_TG32
+      loop_break
+    end
+    echo Reserved
+    loop_break
+  end
+end  
+
+# IA32 2007, Volume 3A, Table 3-1
+set $STA_X = 0x8
+set $STA_E = 0x4
+set $STA_C = 0x4
+set $STA_W = 0x2
+set $STA_R = 0x2
+set $STA_A = 0x1
+
+define outputsta
+  if $arg0 & $STA_X
+    # Code segment
+    echo code
+    if $arg0 & $STA_C
+      echo |STA_C
+    end
+    if $arg0 & $STA_R
+      echo |STA_R
+    end
+  else
+    # Data segment
+    echo data
+    if $arg0 & $STA_E
+      echo |STA_E
+    end
+    if $arg0 & $STA_W
+      echo |STA_W
+    end
+  end
+  if $arg0 & $STA_A
+    echo |STA_A
+  else
+    printf "      "
+  end
+end
+
+# xv6-specific
+set $SEG_KCODE = 1
+set $SEG_KDATA = 2
+set $SEG_KCPU  = 3
+set $SEG_UCODE = 4
+set $SEG_UDATA = 5
+set $SEG_TSS   = 6
+
+define outputcs
+  if ($arg0 & 4) == 0
+    if $arg0 >> 3 == $SEG_KCODE
+      printf "SEG_KCODE<<3"
+    end
+    if $arg0 >> 3 == $SEG_KDATA
+      printf "SEG_KDATA<<3"
+    end
+    if $arg0 >> 3 == $SEG_KCPU
+      printf "SEG_KCPU<<3"
+    end
+    if $arg0 >> 3 == $SEG_UCODE
+      printf "SEG_UCODE<<3"
+    end
+    if $arg0 >> 3 == $SEG_UDATA
+      printf "SEG_UDATA<<3"
+    end
+    if $arg0 >> 3 == $SEG_TSS
+      printf "SEG_TSS<<3"
+    end
+    if ($arg0 >> 3 < 1) + ($arg0 >> 3 > 6)
+      printf "GDT[%d]", $arg0 >> 3
+    end
+  else
+    printf "LDT[%d]", $arg0 >> 3
+  end
+  if ($arg0 & 3) > 0
+    printf "|"
+    outputdpl ($arg0&3)
+  end
+end
+
+define outputdpl
+  if $arg0 == 0
+    printf "DPL_KERN"
+  else
+    if $arg0 == 3
+      printf "DPL_USER"
+    else
+      printf "DPL%d", $arg0
+    end
+  end
+end
+
+define printdesc
+  if $argc != 1
+    echo Usage: printdesc expr
+  else
+    _printdesc ((uint*)&($arg0))[0] ((uint*)&($arg0))[1]
+    printf "\n"
+  end
+end
+
+document printdesc
+Print an x86 segment or gate descriptor.
+printdesc EXPR
+EXPR must evaluate to a descriptor value.  It can be of any C type.
+end
+
+define _printdesc
+  _printdesc1 $arg0 $arg1 ($arg1>>15&1) ($arg1>>13&3) ($arg1>>12&1) ($arg1>>8&15)
+end
+
+define _printdesc1
+  # 2:P 3:DPL 4:S 5:Type
+  if $arg2 == 0
+    printf "P = 0 (Not present)"
+  else
+    printf "type = "
+    if $arg4 == 0
+      # System segment
+      outputsts $arg5
+      printf " (0x%x)    ", $arg5
+      _printsysdesc $arg0 $arg1 $arg5
+    else
+      # Code/data segment
+      outputsta $arg5
+      printf "  "
+      _printsegdesc $arg0 $arg1
+    end
+
+    printf "  DPL = "
+    outputdpl $arg3
+    printf " (%d)", $arg3
+  end
+end
+
+define _printsysdesc
+  # 2:Type
+  # GDB's || is buggy
+  if ($arg2 == $STS_TG) + (($arg2&7) == $STS_IG16) + (($arg2&7) == $STS_TG16)
+    # Gate descriptor
+    _printgate $arg2 ($arg0>>16) ($arg0&0xFFFF) ($arg1>>16)
+  else
+    # System segment descriptor
+    _printsegdesc $arg0 $arg1
+  end
+end
+
+define _printgate
+  # IA32 2007, Voume 3A, Figure 5-2
+  # 0:Type 1:CS 2:Offset 15..0 3:Offset 31..16
+  printf "CS = "
+  outputcs $arg1
+  printf " (%d)", $arg1
+
+  if (($arg0&7) == $STS_IG16) + (($arg0&7) == $STS_TG16)
+    printf "  Offset = "
+    output/a $arg3 << 16 | $arg2
+  end
+end
+
+define _printsegdesc
+  # IA32 20007, Volume 3A, Figure 3-8 and Figure 4-1
+  _printsegdesc1 ($arg0>>16) ($arg1&0xFF) ($arg1>>24) ($arg0&0xFFFF) ($arg1>>16&15) ($arg1>>23&1)
+  if ($arg1>>12&1) == 1
+    printf "  AVL = %d", $arg1>>20&1
+    if ($arg1>>11&1) == 0
+      # Data segment
+      if ($arg1>>22&1) == 0
+        printf "  B = small (0) "
+      else
+        printf "  B = big (1)   "
+      end
+    else
+      # Code segment
+      printf "  D = "
+      if ($arg1>>22&1) == 0
+        printf "16-bit (0)"
+      else
+        printf "32-bit (1)"
+      end
+    end
+  end
+end
+
+define _printsegdesc1
+  # 0:Base 0..15  1:Base 16..23  2:Base 24..32  3:Limit 0..15  4:Limit 16..19  5:G
+  printf "base = 0x%08x", $arg0 | ($arg1<<16) | ($arg2<<24)
+  printf "  limit = 0x"
+  if $arg5 == 0
+    printf "%08x", $arg3 | ($arg4<<16)
+  else
+    printf "%08x", (($arg3 | ($arg4<<16)) << 12) | 0xFFF
+  end
+end
+
+define printdescs
+  if $argc < 1 || $argc > 2
+    echo Usage: printdescs expr [count]
+  else
+    if $argc == 1
+      _printdescs ($arg0) (sizeof($arg0)/sizeof(($arg0)[0]))
+    else
+      _printdescs ($arg0) ($arg1)
+    end
+  end
+end
+
+document printdescs
+Print an array of x86 segment or gate descriptors.
+printdescs EXPR [COUNT]
+EXPR must evaluate to an array of descriptors.
+end
+
+define _printdescs
+  set $i = 0
+  while $i < $arg1
+    printf "[%d] ", $i
+    printdesc $arg0[$i]
+    set $i = $i + 1
+  end
+end
diff --git a/xv6-public/grep.c b/xv6-public/grep.c
new file mode 100644
index 0000000..adc4835
--- /dev/null
+++ b/xv6-public/grep.c
@@ -0,0 +1,107 @@
+// Simple grep.  Only supports ^ . * $ operators.
+
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+char buf[1024];
+int match(char*, char*);
+
+void
+grep(char *pattern, int fd)
+{
+  int n, m;
+  char *p, *q;
+
+  m = 0;
+  while((n = read(fd, buf+m, sizeof(buf)-m-1)) > 0){
+    m += n;
+    buf[m] = '\0';
+    p = buf;
+    while((q = strchr(p, '\n')) != 0){
+      *q = 0;
+      if(match(pattern, p)){
+        *q = '\n';
+        write(1, p, q+1 - p);
+      }
+      p = q+1;
+    }
+    if(p == buf)
+      m = 0;
+    if(m > 0){
+      m -= p - buf;
+      memmove(buf, p, m);
+    }
+  }
+}
+
+int
+main(int argc, char *argv[])
+{
+  int fd, i;
+  char *pattern;
+
+  if(argc <= 1){
+    printf(2, "usage: grep pattern [file ...]\n");
+    exit();
+  }
+  pattern = argv[1];
+
+  if(argc <= 2){
+    grep(pattern, 0);
+    exit();
+  }
+
+  for(i = 2; i < argc; i++){
+    if((fd = open(argv[i], 0)) < 0){
+      printf(1, "grep: cannot open %s\n", argv[i]);
+      exit();
+    }
+    grep(pattern, fd);
+    close(fd);
+  }
+  exit();
+}
+
+// Regexp matcher from Kernighan & Pike,
+// The Practice of Programming, Chapter 9.
+
+int matchhere(char*, char*);
+int matchstar(int, char*, char*);
+
+int
+match(char *re, char *text)
+{
+  if(re[0] == '^')
+    return matchhere(re+1, text);
+  do{  // must look at empty string
+    if(matchhere(re, text))
+      return 1;
+  }while(*text++ != '\0');
+  return 0;
+}
+
+// matchhere: search for re at beginning of text
+int matchhere(char *re, char *text)
+{
+  if(re[0] == '\0')
+    return 1;
+  if(re[1] == '*')
+    return matchstar(re[0], re+2, text);
+  if(re[0] == '$' && re[1] == '\0')
+    return *text == '\0';
+  if(*text!='\0' && (re[0]=='.' || re[0]==*text))
+    return matchhere(re+1, text+1);
+  return 0;
+}
+
+// matchstar: search for c*re at beginning of text
+int matchstar(int c, char *re, char *text)
+{
+  do{  // a * matches zero or more instances
+    if(matchhere(re, text))
+      return 1;
+  }while(*text!='\0' && (*text++==c || c=='.'));
+  return 0;
+}
+
diff --git a/xv6-public/ide.c b/xv6-public/ide.c
new file mode 100644
index 0000000..021adb1
--- /dev/null
+++ b/xv6-public/ide.c
@@ -0,0 +1,169 @@
+// Simple PIO-based (non-DMA) IDE driver code.
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+#include "traps.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "fs.h"
+#include "buf.h"
+
+#define SECTOR_SIZE   512
+#define IDE_BSY       0x80
+#define IDE_DRDY      0x40
+#define IDE_DF        0x20
+#define IDE_ERR       0x01
+
+#define IDE_CMD_READ  0x20
+#define IDE_CMD_WRITE 0x30
+#define IDE_CMD_RDMUL 0xc4
+#define IDE_CMD_WRMUL 0xc5
+
+// idequeue points to the buf now being read/written to the disk.
+// idequeue->qnext points to the next buf to be processed.
+// You must hold idelock while manipulating queue.
+
+static struct spinlock idelock;
+static struct buf *idequeue;
+
+static int havedisk1;
+static void idestart(struct buf*);
+
+// Wait for IDE disk to become ready.
+static int
+idewait(int checkerr)
+{
+  int r;
+
+  while(((r = inb(0x1f7)) & (IDE_BSY|IDE_DRDY)) != IDE_DRDY)
+    ;
+  if(checkerr && (r & (IDE_DF|IDE_ERR)) != 0)
+    return -1;
+  return 0;
+}
+
+void
+ideinit(void)
+{
+  int i;
+
+  initlock(&idelock, "ide");
+  ioapicenable(IRQ_IDE, ncpu - 1);
+  idewait(0);
+
+  // Check if disk 1 is present
+  outb(0x1f6, 0xe0 | (1<<4));
+  for(i=0; i<1000; i++){
+    if(inb(0x1f7) != 0){
+      havedisk1 = 1;
+      break;
+    }
+  }
+
+  // Switch back to disk 0.
+  outb(0x1f6, 0xe0 | (0<<4));
+}
+
+// Start the request for b.  Caller must hold idelock.
+static void
+idestart(struct buf *b)
+{
+  if(b == 0)
+    panic("idestart");
+  if(b->blockno >= FSSIZE)
+    panic("incorrect blockno");
+  int sector_per_block =  BSIZE/SECTOR_SIZE;
+  int sector = b->blockno * sector_per_block;
+  int read_cmd = (sector_per_block == 1) ? IDE_CMD_READ :  IDE_CMD_RDMUL;
+  int write_cmd = (sector_per_block == 1) ? IDE_CMD_WRITE : IDE_CMD_WRMUL;
+
+  if (sector_per_block > 7) panic("idestart");
+
+  idewait(0);
+  outb(0x3f6, 0);  // generate interrupt
+  outb(0x1f2, sector_per_block);  // number of sectors
+  outb(0x1f3, sector & 0xff);
+  outb(0x1f4, (sector >> 8) & 0xff);
+  outb(0x1f5, (sector >> 16) & 0xff);
+  outb(0x1f6, 0xe0 | ((b->dev&1)<<4) | ((sector>>24)&0x0f));
+  if(b->flags & B_DIRTY){
+    outb(0x1f7, write_cmd);
+    outsl(0x1f0, b->data, BSIZE/4);
+  } else {
+    outb(0x1f7, read_cmd);
+  }
+}
+
+// Interrupt handler.
+void
+ideintr(void)
+{
+  struct buf *b;
+
+  // First queued buffer is the active request.
+  acquire(&idelock);
+
+  if((b = idequeue) == 0){
+    release(&idelock);
+    return;
+  }
+  idequeue = b->qnext;
+
+  // Read data if needed.
+  if(!(b->flags & B_DIRTY) && idewait(1) >= 0)
+    insl(0x1f0, b->data, BSIZE/4);
+
+  // Wake process waiting for this buf.
+  b->flags |= B_VALID;
+  b->flags &= ~B_DIRTY;
+  wakeup(b);
+
+  // Start disk on next buf in queue.
+  if(idequeue != 0)
+    idestart(idequeue);
+
+  release(&idelock);
+}
+
+//PAGEBREAK!
+// Sync buf with disk.
+// If B_DIRTY is set, write buf to disk, clear B_DIRTY, set B_VALID.
+// Else if B_VALID is not set, read buf from disk, set B_VALID.
+void
+iderw(struct buf *b)
+{
+  struct buf **pp;
+
+  if(!holdingsleep(&b->lock))
+    panic("iderw: buf not locked");
+  if((b->flags & (B_VALID|B_DIRTY)) == B_VALID)
+    panic("iderw: nothing to do");
+  if(b->dev != 0 && !havedisk1)
+    panic("iderw: ide disk 1 not present");
+
+  
+  acquire(&idelock);  //DOC:acquire-lock
+  // sti();
+  // Append b to idequeue.
+  b->qnext = 0;
+  for(pp=&idequeue; *pp; pp=&(*pp)->qnext)  //DOC:insert-queue
+    ;
+  *pp = b;
+
+  // Start disk if necessary.
+  if(idequeue == b)
+    idestart(b);
+
+  // Wait for request to finish.
+  while((b->flags & (B_VALID|B_DIRTY)) != B_VALID){
+    sleep(b, &idelock);
+  }
+
+  // cli();
+  release(&idelock);
+}
diff --git a/xv6-public/init.c b/xv6-public/init.c
new file mode 100644
index 0000000..046b551
--- /dev/null
+++ b/xv6-public/init.c
@@ -0,0 +1,37 @@
+// init: The initial user-level program
+
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+#include "fcntl.h"
+
+char *argv[] = { "sh", 0 };
+
+int
+main(void)
+{
+  int pid, wpid;
+
+  if(open("console", O_RDWR) < 0){
+    mknod("console", 1, 1);
+    open("console", O_RDWR);
+  }
+  dup(0);  // stdout
+  dup(0);  // stderr
+
+  for(;;){
+    printf(1, "init: starting sh\n");
+    pid = fork();
+    if(pid < 0){
+      printf(1, "init: fork failed\n");
+      exit();
+    }
+    if(pid == 0){
+      exec("sh", argv);
+      printf(1, "init: exec sh failed\n");
+      exit();
+    }
+    while((wpid=wait()) >= 0 && wpid != pid)
+      printf(1, "zombie!\n");
+  }
+}
diff --git a/xv6-public/initcode.S b/xv6-public/initcode.S
new file mode 100644
index 0000000..80ac5d8
--- /dev/null
+++ b/xv6-public/initcode.S
@@ -0,0 +1,32 @@
+# Initial process execs /init.
+# This code runs in user space.
+
+#include "syscall.h"
+#include "traps.h"
+
+
+# exec(init, argv)
+.globl start
+start:
+  pushl $argv
+  pushl $init
+  pushl $0  // where caller pc would be
+  movl $SYS_exec, %eax
+  int $T_SYSCALL
+
+# for(;;) exit();
+exit:
+  movl $SYS_exit, %eax
+  int $T_SYSCALL
+  jmp exit
+
+# char init[] = "/init\0";
+init:
+  .string "/init\0"
+
+# char *argv[] = { init, 0 };
+.p2align 2
+argv:
+  .long init
+  .long 0
+
diff --git a/xv6-public/ioapic.c b/xv6-public/ioapic.c
new file mode 100644
index 0000000..cb0f015
--- /dev/null
+++ b/xv6-public/ioapic.c
@@ -0,0 +1,75 @@
+// The I/O APIC manages hardware interrupts for an SMP system.
+// http://www.intel.com/design/chipsets/datashts/29056601.pdf
+// See also picirq.c.
+
+#include "types.h"
+#include "defs.h"
+#include "traps.h"
+
+#define IOAPIC  0xFEC00000   // Default physical address of IO APIC
+
+#define REG_ID     0x00  // Register index: ID
+#define REG_VER    0x01  // Register index: version
+#define REG_TABLE  0x10  // Redirection table base
+
+// The redirection table starts at REG_TABLE and uses
+// two registers to configure each interrupt.
+// The first (low) register in a pair contains configuration bits.
+// The second (high) register contains a bitmask telling which
+// CPUs can serve that interrupt.
+#define INT_DISABLED   0x00010000  // Interrupt disabled
+#define INT_LEVEL      0x00008000  // Level-triggered (vs edge-)
+#define INT_ACTIVELOW  0x00002000  // Active low (vs high)
+#define INT_LOGICAL    0x00000800  // Destination is CPU id (vs APIC ID)
+
+volatile struct ioapic *ioapic;
+
+// IO APIC MMIO structure: write reg, then read or write data.
+struct ioapic {
+  uint reg;
+  uint pad[3];
+  uint data;
+};
+
+static uint
+ioapicread(int reg)
+{
+  ioapic->reg = reg;
+  return ioapic->data;
+}
+
+static void
+ioapicwrite(int reg, uint data)
+{
+  ioapic->reg = reg;
+  ioapic->data = data;
+}
+
+void
+ioapicinit(void)
+{
+  int i, id, maxintr;
+
+  ioapic = (volatile struct ioapic*)IOAPIC;
+  maxintr = (ioapicread(REG_VER) >> 16) & 0xFF;
+  id = ioapicread(REG_ID) >> 24;
+  if(id != ioapicid)
+    cprintf("ioapicinit: id isn't equal to ioapicid; not a MP\n");
+
+  // Mark all interrupts edge-triggered, active high, disabled,
+  // and not routed to any CPUs.
+  for(i = 0; i <= maxintr; i++){
+    ioapicwrite(REG_TABLE+2*i, INT_DISABLED | (T_IRQ0 + i));
+    ioapicwrite(REG_TABLE+2*i+1, 0);
+  }
+}
+
+void
+ioapicenable(int irq, int cpunum)
+{
+  // Mark interrupt edge-triggered, active high,
+  // enabled, and routed to the given cpunum,
+  // which happens to be that cpu's APIC ID.
+  ioapicwrite(REG_TABLE+2*irq, T_IRQ0 + irq);
+  ioapicwrite(REG_TABLE+2*irq+1, cpunum << 24);
+}
diff --git a/xv6-public/kalloc.c b/xv6-public/kalloc.c
new file mode 100644
index 0000000..14cd4f4
--- /dev/null
+++ b/xv6-public/kalloc.c
@@ -0,0 +1,96 @@
+// Physical memory allocator, intended to allocate
+// memory for user processes, kernel stacks, page table pages,
+// and pipe buffers. Allocates 4096-byte pages.
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "spinlock.h"
+
+void freerange(void *vstart, void *vend);
+extern char end[]; // first address after kernel loaded from ELF file
+                   // defined by the kernel linker script in kernel.ld
+
+struct run {
+  struct run *next;
+};
+
+struct {
+  struct spinlock lock;
+  int use_lock;
+  struct run *freelist;
+} kmem;
+
+// Initialization happens in two phases.
+// 1. main() calls kinit1() while still using entrypgdir to place just
+// the pages mapped by entrypgdir on free list.
+// 2. main() calls kinit2() with the rest of the physical pages
+// after installing a full page table that maps them on all cores.
+void
+kinit1(void *vstart, void *vend)
+{
+  initlock(&kmem.lock, "kmem");
+  kmem.use_lock = 0;
+  freerange(vstart, vend);
+}
+
+void
+kinit2(void *vstart, void *vend)
+{
+  freerange(vstart, vend);
+  kmem.use_lock = 1;
+}
+
+void
+freerange(void *vstart, void *vend)
+{
+  char *p;
+  p = (char*)PGROUNDUP((uint)vstart);
+  for(; p + PGSIZE <= (char*)vend; p += PGSIZE)
+    kfree(p);
+}
+//PAGEBREAK: 21
+// Free the page of physical memory pointed at by v,
+// which normally should have been returned by a
+// call to kalloc().  (The exception is when
+// initializing the allocator; see kinit above.)
+void
+kfree(char *v)
+{
+  struct run *r;
+
+  if((uint)v % PGSIZE || v < end || V2P(v) >= PHYSTOP)
+    panic("kfree");
+
+  // Fill with junk to catch dangling refs.
+  memset(v, 1, PGSIZE);
+
+  if(kmem.use_lock)
+    acquire(&kmem.lock);
+  r = (struct run*)v;
+  r->next = kmem.freelist;
+  kmem.freelist = r;
+  if(kmem.use_lock)
+    release(&kmem.lock);
+}
+
+// Allocate one 4096-byte page of physical memory.
+// Returns a pointer that the kernel can use.
+// Returns 0 if the memory cannot be allocated.
+char*
+kalloc(void)
+{
+  struct run *r;
+
+  if(kmem.use_lock)
+    acquire(&kmem.lock);
+  r = kmem.freelist;
+  if(r)
+    kmem.freelist = r->next;
+  if(kmem.use_lock)
+    release(&kmem.lock);
+  return (char*)r;
+}
+
diff --git a/xv6-public/kbd.c b/xv6-public/kbd.c
new file mode 100644
index 0000000..32c1463
--- /dev/null
+++ b/xv6-public/kbd.c
@@ -0,0 +1,50 @@
+#include "types.h"
+#include "x86.h"
+#include "defs.h"
+#include "kbd.h"
+
+int
+kbdgetc(void)
+{
+  static uint shift;
+  static uchar *charcode[4] = {
+    normalmap, shiftmap, ctlmap, ctlmap
+  };
+  uint st, data, c;
+
+  st = inb(KBSTATP);
+  if((st & KBS_DIB) == 0)
+    return -1;
+  data = inb(KBDATAP);
+
+  if(data == 0xE0){
+    shift |= E0ESC;
+    return 0;
+  } else if(data & 0x80){
+    // Key released
+    data = (shift & E0ESC ? data : data & 0x7F);
+    shift &= ~(shiftcode[data] | E0ESC);
+    return 0;
+  } else if(shift & E0ESC){
+    // Last character was an E0 escape; or with 0x80
+    data |= 0x80;
+    shift &= ~E0ESC;
+  }
+
+  shift |= shiftcode[data];
+  shift ^= togglecode[data];
+  c = charcode[shift & (CTL | SHIFT)][data];
+  if(shift & CAPSLOCK){
+    if('a' <= c && c <= 'z')
+      c += 'A' - 'a';
+    else if('A' <= c && c <= 'Z')
+      c += 'a' - 'A';
+  }
+  return c;
+}
+
+void
+kbdintr(void)
+{
+  consoleintr(kbdgetc);
+}
diff --git a/xv6-public/kbd.h b/xv6-public/kbd.h
new file mode 100644
index 0000000..babbd6e
--- /dev/null
+++ b/xv6-public/kbd.h
@@ -0,0 +1,112 @@
+// PC keyboard interface constants
+
+#define KBSTATP         0x64    // kbd controller status port(I)
+#define KBS_DIB         0x01    // kbd data in buffer
+#define KBDATAP         0x60    // kbd data port(I)
+
+#define NO              0
+
+#define SHIFT           (1<<0)
+#define CTL             (1<<1)
+#define ALT             (1<<2)
+
+#define CAPSLOCK        (1<<3)
+#define NUMLOCK         (1<<4)
+#define SCROLLLOCK      (1<<5)
+
+#define E0ESC           (1<<6)
+
+// Special keycodes
+#define KEY_HOME        0xE0
+#define KEY_END         0xE1
+#define KEY_UP          0xE2
+#define KEY_DN          0xE3
+#define KEY_LF          0xE4
+#define KEY_RT          0xE5
+#define KEY_PGUP        0xE6
+#define KEY_PGDN        0xE7
+#define KEY_INS         0xE8
+#define KEY_DEL         0xE9
+
+// C('A') == Control-A
+#define C(x) (x - '@')
+
+static uchar shiftcode[256] =
+{
+  [0x1D] CTL,
+  [0x2A] SHIFT,
+  [0x36] SHIFT,
+  [0x38] ALT,
+  [0x9D] CTL,
+  [0xB8] ALT
+};
+
+static uchar togglecode[256] =
+{
+  [0x3A] CAPSLOCK,
+  [0x45] NUMLOCK,
+  [0x46] SCROLLLOCK
+};
+
+static uchar normalmap[256] =
+{
+  NO,   0x1B, '1',  '2',  '3',  '4',  '5',  '6',  // 0x00
+  '7',  '8',  '9',  '0',  '-',  '=',  '\b', '\t',
+  'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',  // 0x10
+  'o',  'p',  '[',  ']',  '\n', NO,   'a',  's',
+  'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';',  // 0x20
+  '\'', '`',  NO,   '\\', 'z',  'x',  'c',  'v',
+  'b',  'n',  'm',  ',',  '.',  '/',  NO,   '*',  // 0x30
+  NO,   ' ',  NO,   NO,   NO,   NO,   NO,   NO,
+  NO,   NO,   NO,   NO,   NO,   NO,   NO,   '7',  // 0x40
+  '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',
+  '2',  '3',  '0',  '.',  NO,   NO,   NO,   NO,   // 0x50
+  [0x9C] '\n',      // KP_Enter
+  [0xB5] '/',       // KP_Div
+  [0xC8] KEY_UP,    [0xD0] KEY_DN,
+  [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,
+  [0xCB] KEY_LF,    [0xCD] KEY_RT,
+  [0x97] KEY_HOME,  [0xCF] KEY_END,
+  [0xD2] KEY_INS,   [0xD3] KEY_DEL
+};
+
+static uchar shiftmap[256] =
+{
+  NO,   033,  '!',  '@',  '#',  '$',  '%',  '^',  // 0x00
+  '&',  '*',  '(',  ')',  '_',  '+',  '\b', '\t',
+  'Q',  'W',  'E',  'R',  'T',  'Y',  'U',  'I',  // 0x10
+  'O',  'P',  '{',  '}',  '\n', NO,   'A',  'S',
+  'D',  'F',  'G',  'H',  'J',  'K',  'L',  ':',  // 0x20
+  '"',  '~',  NO,   '|',  'Z',  'X',  'C',  'V',
+  'B',  'N',  'M',  '<',  '>',  '?',  NO,   '*',  // 0x30
+  NO,   ' ',  NO,   NO,   NO,   NO,   NO,   NO,
+  NO,   NO,   NO,   NO,   NO,   NO,   NO,   '7',  // 0x40
+  '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',
+  '2',  '3',  '0',  '.',  NO,   NO,   NO,   NO,   // 0x50
+  [0x9C] '\n',      // KP_Enter
+  [0xB5] '/',       // KP_Div
+  [0xC8] KEY_UP,    [0xD0] KEY_DN,
+  [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,
+  [0xCB] KEY_LF,    [0xCD] KEY_RT,
+  [0x97] KEY_HOME,  [0xCF] KEY_END,
+  [0xD2] KEY_INS,   [0xD3] KEY_DEL
+};
+
+static uchar ctlmap[256] =
+{
+  NO,      NO,      NO,      NO,      NO,      NO,      NO,      NO,
+  NO,      NO,      NO,      NO,      NO,      NO,      NO,      NO,
+  C('Q'),  C('W'),  C('E'),  C('R'),  C('T'),  C('Y'),  C('U'),  C('I'),
+  C('O'),  C('P'),  NO,      NO,      '\r',    NO,      C('A'),  C('S'),
+  C('D'),  C('F'),  C('G'),  C('H'),  C('J'),  C('K'),  C('L'),  NO,
+  NO,      NO,      NO,      C('\\'), C('Z'),  C('X'),  C('C'),  C('V'),
+  C('B'),  C('N'),  C('M'),  NO,      NO,      C('/'),  NO,      NO,
+  [0x9C] '\r',      // KP_Enter
+  [0xB5] C('/'),    // KP_Div
+  [0xC8] KEY_UP,    [0xD0] KEY_DN,
+  [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,
+  [0xCB] KEY_LF,    [0xCD] KEY_RT,
+  [0x97] KEY_HOME,  [0xCF] KEY_END,
+  [0xD2] KEY_INS,   [0xD3] KEY_DEL
+};
+
diff --git a/xv6-public/kernel.ld b/xv6-public/kernel.ld
new file mode 100644
index 0000000..e24c860
--- /dev/null
+++ b/xv6-public/kernel.ld
@@ -0,0 +1,68 @@
+/* Simple linker script for the JOS kernel.
+   See the GNU ld 'info' manual ("info ld") to learn the syntax. */
+
+OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
+OUTPUT_ARCH(i386)
+ENTRY(_start)
+
+SECTIONS
+{
+	/* Link the kernel at this address: "." means the current address */
+        /* Must be equal to KERNLINK */
+	. = 0x80100000;
+
+	.text : AT(0x100000) {
+		*(.text .stub .text.* .gnu.linkonce.t.*)
+	}
+
+	PROVIDE(etext = .);	/* Define the 'etext' symbol to this value */
+
+	.rodata : {
+		*(.rodata .rodata.* .gnu.linkonce.r.*)
+	}
+
+	/* Include debugging information in kernel memory */
+	.stab : {
+		PROVIDE(__STAB_BEGIN__ = .);
+		*(.stab);
+		PROVIDE(__STAB_END__ = .);
+		BYTE(0)		/* Force the linker to allocate space
+				   for this section */
+	}
+
+	.stabstr : {
+		PROVIDE(__STABSTR_BEGIN__ = .);
+		*(.stabstr);
+		PROVIDE(__STABSTR_END__ = .);
+		BYTE(0)		/* Force the linker to allocate space
+				   for this section */
+	}
+
+	/* Adjust the address for the data segment to the next page */
+	. = ALIGN(0x1000);
+
+	/* Conventionally, Unix linkers provide pseudo-symbols
+	 * etext, edata, and end, at the end of the text, data, and bss.
+	 * For the kernel mapping, we need the address at the beginning
+	 * of the data section, but that's not one of the conventional
+	 * symbols, because the convention started before there was a
+	 * read-only rodata section between text and data. */
+	PROVIDE(data = .);
+
+	/* The data segment */
+	.data : {
+		*(.data)
+	}
+
+	PROVIDE(edata = .);
+
+	.bss : {
+		*(.bss)
+	}
+
+	PROVIDE(end = .);
+
+	/DISCARD/ : {
+		*(.eh_frame .note.GNU-stack)
+	}
+}
diff --git a/xv6-public/kill.c b/xv6-public/kill.c
new file mode 100644
index 0000000..364f6af
--- /dev/null
+++ b/xv6-public/kill.c
@@ -0,0 +1,17 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int
+main(int argc, char **argv)
+{
+  int i;
+
+  if(argc < 2){
+    printf(2, "usage: kill pid...\n");
+    exit();
+  }
+  for(i=1; i<argc; i++)
+    kill(atoi(argv[i]));
+  exit();
+}
diff --git a/xv6-public/lapic.c b/xv6-public/lapic.c
new file mode 100644
index 0000000..b22bbd7
--- /dev/null
+++ b/xv6-public/lapic.c
@@ -0,0 +1,229 @@
+// The local APIC manages internal (non-I/O) interrupts.
+// See Chapter 8 & Appendix C of Intel processor manual volume 3.
+
+#include "param.h"
+#include "types.h"
+#include "defs.h"
+#include "date.h"
+#include "memlayout.h"
+#include "traps.h"
+#include "mmu.h"
+#include "x86.h"
+
+// Local APIC registers, divided by 4 for use as uint[] indices.
+#define ID      (0x0020/4)   // ID
+#define VER     (0x0030/4)   // Version
+#define TPR     (0x0080/4)   // Task Priority
+#define EOI     (0x00B0/4)   // EOI
+#define SVR     (0x00F0/4)   // Spurious Interrupt Vector
+  #define ENABLE     0x00000100   // Unit Enable
+#define ESR     (0x0280/4)   // Error Status
+#define ICRLO   (0x0300/4)   // Interrupt Command
+  #define INIT       0x00000500   // INIT/RESET
+  #define STARTUP    0x00000600   // Startup IPI
+  #define DELIVS     0x00001000   // Delivery status
+  #define ASSERT     0x00004000   // Assert interrupt (vs deassert)
+  #define DEASSERT   0x00000000
+  #define LEVEL      0x00008000   // Level triggered
+  #define BCAST      0x00080000   // Send to all APICs, including self.
+  #define BUSY       0x00001000
+  #define FIXED      0x00000000
+#define ICRHI   (0x0310/4)   // Interrupt Command [63:32]
+#define TIMER   (0x0320/4)   // Local Vector Table 0 (TIMER)
+  #define X1         0x0000000B   // divide counts by 1
+  #define PERIODIC   0x00020000   // Periodic
+#define PCINT   (0x0340/4)   // Performance Counter LVT
+#define LINT0   (0x0350/4)   // Local Vector Table 1 (LINT0)
+#define LINT1   (0x0360/4)   // Local Vector Table 2 (LINT1)
+#define ERROR   (0x0370/4)   // Local Vector Table 3 (ERROR)
+  #define MASKED     0x00010000   // Interrupt masked
+#define TICR    (0x0380/4)   // Timer Initial Count
+#define TCCR    (0x0390/4)   // Timer Current Count
+#define TDCR    (0x03E0/4)   // Timer Divide Configuration
+
+volatile uint *lapic;  // Initialized in mp.c
+
+//PAGEBREAK!
+static void
+lapicw(int index, int value)
+{
+  lapic[index] = value;
+  lapic[ID];  // wait for write to finish, by reading
+}
+
+void
+lapicinit(void)
+{
+  if(!lapic)
+    return;
+
+  // Enable local APIC; set spurious interrupt vector.
+  lapicw(SVR, ENABLE | (T_IRQ0 + IRQ_SPURIOUS));
+
+  // The timer repeatedly counts down at bus frequency
+  // from lapic[TICR] and then issues an interrupt.
+  // If xv6 cared more about precise timekeeping,
+  // TICR would be calibrated using an external time source.
+  lapicw(TDCR, X1);
+  lapicw(TIMER, PERIODIC | (T_IRQ0 + IRQ_TIMER));
+  lapicw(TICR, 10000000);
+
+  // Disable logical interrupt lines.
+  lapicw(LINT0, MASKED);
+  lapicw(LINT1, MASKED);
+
+  // Disable performance counter overflow interrupts
+  // on machines that provide that interrupt entry.
+  if(((lapic[VER]>>16) & 0xFF) >= 4)
+    lapicw(PCINT, MASKED);
+
+  // Map error interrupt to IRQ_ERROR.
+  lapicw(ERROR, T_IRQ0 + IRQ_ERROR);
+
+  // Clear error status register (requires back-to-back writes).
+  lapicw(ESR, 0);
+  lapicw(ESR, 0);
+
+  // Ack any outstanding interrupts.
+  lapicw(EOI, 0);
+
+  // Send an Init Level De-Assert to synchronise arbitration ID's.
+  lapicw(ICRHI, 0);
+  lapicw(ICRLO, BCAST | INIT | LEVEL);
+  while(lapic[ICRLO] & DELIVS)
+    ;
+
+  // Enable interrupts on the APIC (but not on the processor).
+  lapicw(TPR, 0);
+}
+
+int
+lapicid(void)
+{
+  if (!lapic)
+    return 0;
+  return lapic[ID] >> 24;
+}
+
+// Acknowledge interrupt.
+void
+lapiceoi(void)
+{
+  if(lapic)
+    lapicw(EOI, 0);
+}
+
+// Spin for a given number of microseconds.
+// On real hardware would want to tune this dynamically.
+void
+microdelay(int us)
+{
+}
+
+#define CMOS_PORT    0x70
+#define CMOS_RETURN  0x71
+
+// Start additional processor running entry code at addr.
+// See Appendix B of MultiProcessor Specification.
+void
+lapicstartap(uchar apicid, uint addr)
+{
+  int i;
+  ushort *wrv;
+
+  // "The BSP must initialize CMOS shutdown code to 0AH
+  // and the warm reset vector (DWORD based at 40:67) to point at
+  // the AP startup code prior to the [universal startup algorithm]."
+  outb(CMOS_PORT, 0xF);  // offset 0xF is shutdown code
+  outb(CMOS_PORT+1, 0x0A);
+  wrv = (ushort*)P2V((0x40<<4 | 0x67));  // Warm reset vector
+  wrv[0] = 0;
+  wrv[1] = addr >> 4;
+
+  // "Universal startup algorithm."
+  // Send INIT (level-triggered) interrupt to reset other CPU.
+  lapicw(ICRHI, apicid<<24);
+  lapicw(ICRLO, INIT | LEVEL | ASSERT);
+  microdelay(200);
+  lapicw(ICRLO, INIT | LEVEL);
+  microdelay(100);    // should be 10ms, but too slow in Bochs!
+
+  // Send startup IPI (twice!) to enter code.
+  // Regular hardware is supposed to only accept a STARTUP
+  // when it is in the halted state due to an INIT.  So the second
+  // should be ignored, but it is part of the official Intel algorithm.
+  // Bochs complains about the second one.  Too bad for Bochs.
+  for(i = 0; i < 2; i++){
+    lapicw(ICRHI, apicid<<24);
+    lapicw(ICRLO, STARTUP | (addr>>12));
+    microdelay(200);
+  }
+}
+
+#define CMOS_STATA   0x0a
+#define CMOS_STATB   0x0b
+#define CMOS_UIP    (1 << 7)        // RTC update in progress
+
+#define SECS    0x00
+#define MINS    0x02
+#define HOURS   0x04
+#define DAY     0x07
+#define MONTH   0x08
+#define YEAR    0x09
+
+static uint
+cmos_read(uint reg)
+{
+  outb(CMOS_PORT,  reg);
+  microdelay(200);
+
+  return inb(CMOS_RETURN);
+}
+
+static void
+fill_rtcdate(struct rtcdate *r)
+{
+  r->second = cmos_read(SECS);
+  r->minute = cmos_read(MINS);
+  r->hour   = cmos_read(HOURS);
+  r->day    = cmos_read(DAY);
+  r->month  = cmos_read(MONTH);
+  r->year   = cmos_read(YEAR);
+}
+
+// qemu seems to use 24-hour GWT and the values are BCD encoded
+void
+cmostime(struct rtcdate *r)
+{
+  struct rtcdate t1, t2;
+  int sb, bcd;
+
+  sb = cmos_read(CMOS_STATB);
+
+  bcd = (sb & (1 << 2)) == 0;
+
+  // make sure CMOS doesn't modify time while we read it
+  for(;;) {
+    fill_rtcdate(&t1);
+    if(cmos_read(CMOS_STATA) & CMOS_UIP)
+        continue;
+    fill_rtcdate(&t2);
+    if(memcmp(&t1, &t2, sizeof(t1)) == 0)
+      break;
+  }
+
+  // convert
+  if(bcd) {
+#define    CONV(x)     (t1.x = ((t1.x >> 4) * 10) + (t1.x & 0xf))
+    CONV(second);
+    CONV(minute);
+    CONV(hour  );
+    CONV(day   );
+    CONV(month );
+    CONV(year  );
+#undef     CONV
+  }
+
+  *r = t1;
+  r->year += 2000;
+}
diff --git a/xv6-public/ln.c b/xv6-public/ln.c
new file mode 100644
index 0000000..cf8a64e
--- /dev/null
+++ b/xv6-public/ln.c
@@ -0,0 +1,15 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int
+main(int argc, char *argv[])
+{
+  if(argc != 3){
+    printf(2, "Usage: ln old new\n");
+    exit();
+  }
+  if(link(argv[1], argv[2]) < 0)
+    printf(2, "link %s %s: failed\n", argv[1], argv[2]);
+  exit();
+}
diff --git a/xv6-public/log.c b/xv6-public/log.c
new file mode 100644
index 0000000..a64c0f6
--- /dev/null
+++ b/xv6-public/log.c
@@ -0,0 +1,234 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "fs.h"
+#include "buf.h"
+
+// Simple logging that allows concurrent FS system calls.
+//
+// A log transaction contains the updates of multiple FS system
+// calls. The logging system only commits when there are
+// no FS system calls active. Thus there is never
+// any reasoning required about whether a commit might
+// write an uncommitted system call's updates to disk.
+//
+// A system call should call begin_op()/end_op() to mark
+// its start and end. Usually begin_op() just increments
+// the count of in-progress FS system calls and returns.
+// But if it thinks the log is close to running out, it
+// sleeps until the last outstanding end_op() commits.
+//
+// The log is a physical re-do log containing disk blocks.
+// The on-disk log format:
+//   header block, containing block #s for block A, B, C, ...
+//   block A
+//   block B
+//   block C
+//   ...
+// Log appends are synchronous.
+
+// Contents of the header block, used for both the on-disk header block
+// and to keep track in memory of logged block# before commit.
+struct logheader {
+  int n;
+  int block[LOGSIZE];
+};
+
+struct log {
+  struct spinlock lock;
+  int start;
+  int size;
+  int outstanding; // how many FS sys calls are executing.
+  int committing;  // in commit(), please wait.
+  int dev;
+  struct logheader lh;
+};
+struct log log;
+
+static void recover_from_log(void);
+static void commit();
+
+void
+initlog(int dev)
+{
+  if (sizeof(struct logheader) >= BSIZE)
+    panic("initlog: too big logheader");
+
+  struct superblock sb;
+  initlock(&log.lock, "log");
+  readsb(dev, &sb);
+  log.start = sb.logstart;
+  log.size = sb.nlog;
+  log.dev = dev;
+  recover_from_log();
+}
+
+// Copy committed blocks from log to their home location
+static void
+install_trans(void)
+{
+  int tail;
+
+  for (tail = 0; tail < log.lh.n; tail++) {
+    struct buf *lbuf = bread(log.dev, log.start+tail+1); // read log block
+    struct buf *dbuf = bread(log.dev, log.lh.block[tail]); // read dst
+    memmove(dbuf->data, lbuf->data, BSIZE);  // copy block to dst
+    bwrite(dbuf);  // write dst to disk
+    brelse(lbuf);
+    brelse(dbuf);
+  }
+}
+
+// Read the log header from disk into the in-memory log header
+static void
+read_head(void)
+{
+  struct buf *buf = bread(log.dev, log.start);
+  struct logheader *lh = (struct logheader *) (buf->data);
+  int i;
+  log.lh.n = lh->n;
+  for (i = 0; i < log.lh.n; i++) {
+    log.lh.block[i] = lh->block[i];
+  }
+  brelse(buf);
+}
+
+// Write in-memory log header to disk.
+// This is the true point at which the
+// current transaction commits.
+static void
+write_head(void)
+{
+  struct buf *buf = bread(log.dev, log.start);
+  struct logheader *hb = (struct logheader *) (buf->data);
+  int i;
+  hb->n = log.lh.n;
+  for (i = 0; i < log.lh.n; i++) {
+    hb->block[i] = log.lh.block[i];
+  }
+  bwrite(buf);
+  brelse(buf);
+}
+
+static void
+recover_from_log(void)
+{
+  read_head();
+  install_trans(); // if committed, copy from log to disk
+  log.lh.n = 0;
+  write_head(); // clear the log
+}
+
+// called at the start of each FS system call.
+void
+begin_op(void)
+{
+  acquire(&log.lock);
+  while(1){
+    if(log.committing){
+      sleep(&log, &log.lock);
+    } else if(log.lh.n + (log.outstanding+1)*MAXOPBLOCKS > LOGSIZE){
+      // this op might exhaust log space; wait for commit.
+      sleep(&log, &log.lock);
+    } else {
+      log.outstanding += 1;
+      release(&log.lock);
+      break;
+    }
+  }
+}
+
+// called at the end of each FS system call.
+// commits if this was the last outstanding operation.
+void
+end_op(void)
+{
+  int do_commit = 0;
+
+  acquire(&log.lock);
+  log.outstanding -= 1;
+  if(log.committing)
+    panic("log.committing");
+  if(log.outstanding == 0){
+    do_commit = 1;
+    log.committing = 1;
+  } else {
+    // begin_op() may be waiting for log space,
+    // and decrementing log.outstanding has decreased
+    // the amount of reserved space.
+    wakeup(&log);
+  }
+  release(&log.lock);
+
+  if(do_commit){
+    // call commit w/o holding locks, since not allowed
+    // to sleep with locks.
+    commit();
+    acquire(&log.lock);
+    log.committing = 0;
+    wakeup(&log);
+    release(&log.lock);
+  }
+}
+
+// Copy modified blocks from cache to log.
+static void
+write_log(void)
+{
+  int tail;
+
+  for (tail = 0; tail < log.lh.n; tail++) {
+    struct buf *to = bread(log.dev, log.start+tail+1); // log block
+    struct buf *from = bread(log.dev, log.lh.block[tail]); // cache block
+    memmove(to->data, from->data, BSIZE);
+    bwrite(to);  // write the log
+    brelse(from);
+    brelse(to);
+  }
+}
+
+static void
+commit()
+{
+  if (log.lh.n > 0) {
+    write_log();     // Write modified blocks from cache to log
+    write_head();    // Write header to disk -- the real commit
+    install_trans(); // Now install writes to home locations
+    log.lh.n = 0;
+    write_head();    // Erase the transaction from the log
+  }
+}
+
+// Caller has modified b->data and is done with the buffer.
+// Record the block number and pin in the cache with B_DIRTY.
+// commit()/write_log() will do the disk write.
+//
+// log_write() replaces bwrite(); a typical use is:
+//   bp = bread(...)
+//   modify bp->data[]
+//   log_write(bp)
+//   brelse(bp)
+void
+log_write(struct buf *b)
+{
+  int i;
+
+  if (log.lh.n >= LOGSIZE || log.lh.n >= log.size - 1)
+    panic("too big a transaction");
+  if (log.outstanding < 1)
+    panic("log_write outside of trans");
+
+  acquire(&log.lock);
+  for (i = 0; i < log.lh.n; i++) {
+    if (log.lh.block[i] == b->blockno)   // log absorbtion
+      break;
+  }
+  log.lh.block[i] = b->blockno;
+  if (i == log.lh.n)
+    log.lh.n++;
+  b->flags |= B_DIRTY; // prevent eviction
+  release(&log.lock);
+}
+
diff --git a/xv6-public/ls.c b/xv6-public/ls.c
new file mode 100644
index 0000000..2862913
--- /dev/null
+++ b/xv6-public/ls.c
@@ -0,0 +1,85 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+#include "fs.h"
+
+char*
+fmtname(char *path)
+{
+  static char buf[DIRSIZ+1];
+  char *p;
+
+  // Find first character after last slash.
+  for(p=path+strlen(path); p >= path && *p != '/'; p--)
+    ;
+  p++;
+
+  // Return blank-padded name.
+  if(strlen(p) >= DIRSIZ)
+    return p;
+  memmove(buf, p, strlen(p));
+  memset(buf+strlen(p), ' ', DIRSIZ-strlen(p));
+  return buf;
+}
+
+void
+ls(char *path)
+{
+  char buf[512], *p;
+  int fd;
+  struct dirent de;
+  struct stat st;
+
+  if((fd = open(path, 0)) < 0){
+    printf(2, "ls: cannot open %s\n", path);
+    return;
+  }
+
+  if(fstat(fd, &st) < 0){
+    printf(2, "ls: cannot stat %s\n", path);
+    close(fd);
+    return;
+  }
+
+  switch(st.type){
+  case T_FILE:
+    printf(1, "%s %d %d %d\n", fmtname(path), st.type, st.ino, st.size);
+    break;
+
+  case T_DIR:
+    if(strlen(path) + 1 + DIRSIZ + 1 > sizeof buf){
+      printf(1, "ls: path too long\n");
+      break;
+    }
+    strcpy(buf, path);
+    p = buf+strlen(buf);
+    *p++ = '/';
+    while(read(fd, &de, sizeof(de)) == sizeof(de)){
+      if(de.inum == 0)
+        continue;
+      memmove(p, de.name, DIRSIZ);
+      p[DIRSIZ] = 0;
+      if(stat(buf, &st) < 0){
+        printf(1, "ls: cannot stat %s\n", buf);
+        continue;
+      }
+      printf(1, "%s %d %d %d\n", fmtname(buf), st.type, st.ino, st.size);
+    }
+    break;
+  }
+  close(fd);
+}
+
+int
+main(int argc, char *argv[])
+{
+  int i;
+
+  if(argc < 2){
+    ls(".");
+    exit();
+  }
+  for(i=1; i<argc; i++)
+    ls(argv[i]);
+  exit();
+}
diff --git a/xv6-public/main.c b/xv6-public/main.c
new file mode 100644
index 0000000..9924e64
--- /dev/null
+++ b/xv6-public/main.c
@@ -0,0 +1,116 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+
+static void startothers(void);
+static void mpmain(void)  __attribute__((noreturn));
+extern pde_t *kpgdir;
+extern char end[]; // first address after kernel loaded from ELF file
+
+// Bootstrap processor starts running C code here.
+// Allocate a real stack and switch to it, first
+// doing some setup required for memory allocator to work.
+int
+main(void)
+{
+  kinit1(end, P2V(4*1024*1024)); // phys page allocator
+  kvmalloc();      // kernel page table
+  mpinit();        // detect other processors
+  lapicinit();     // interrupt controller
+  seginit();       // segment descriptors
+  picinit();       // disable pic
+  ioapicinit();    // another interrupt controller
+  consoleinit();   // console hardware
+  uartinit();      // serial port
+  pinit();         // process table
+  tvinit();        // trap vectors
+  binit();         // buffer cache
+  fileinit();      // file table
+  ideinit();       // disk 
+  startothers();   // start other processors
+  kinit2(P2V(4*1024*1024), P2V(PHYSTOP)); // must come after startothers()
+  userinit();      // first user process
+  mpmain();        // finish this processor's setup
+}
+
+// Other CPUs jump here from entryother.S.
+static void
+mpenter(void)
+{
+  switchkvm();
+  seginit();
+  lapicinit();
+  mpmain();
+}
+
+// Common CPU setup code.
+static void
+mpmain(void)
+{
+  cprintf("cpu%d: starting %d\n", cpuid(), cpuid());
+  idtinit();       // load idt register
+  xchg(&(mycpu()->started), 1); // tell startothers() we're up
+  scheduler();     // start running processes
+}
+
+pde_t entrypgdir[];  // For entry.S
+
+// Start the non-boot (AP) processors.
+static void
+startothers(void)
+{
+  extern uchar _binary_entryother_start[], _binary_entryother_size[];
+  uchar *code;
+  struct cpu *c;
+  char *stack;
+
+  // Write entry code to unused memory at 0x7000.
+  // The linker has placed the image of entryother.S in
+  // _binary_entryother_start.
+  code = P2V(0x7000);
+  memmove(code, _binary_entryother_start, (uint)_binary_entryother_size);
+
+  for(c = cpus; c < cpus+ncpu; c++){
+    if(c == mycpu())  // We've started already.
+      continue;
+
+    // Tell entryother.S what stack to use, where to enter, and what
+    // pgdir to use. We cannot use kpgdir yet, because the AP processor
+    // is running in low  memory, so we use entrypgdir for the APs too.
+    stack = kalloc();
+    *(void**)(code-4) = stack + KSTACKSIZE;
+    *(void(**)(void))(code-8) = mpenter;
+    *(int**)(code-12) = (void *) V2P(entrypgdir);
+
+    lapicstartap(c->apicid, V2P(code));
+
+    // wait for cpu to finish mpmain()
+    while(c->started == 0)
+      ;
+  }
+}
+
+// The boot page table used in entry.S and entryother.S.
+// Page directories (and page tables) must start on page boundaries,
+// hence the __aligned__ attribute.
+// PTE_PS in a page directory entry enables 4Mbyte pages.
+
+__attribute__((__aligned__(PGSIZE)))
+pde_t entrypgdir[NPDENTRIES] = {
+  // Map VA's [0, 4MB) to PA's [0, 4MB)
+  [0] = (0) | PTE_P | PTE_W | PTE_PS,
+  // Map VA's [KERNBASE, KERNBASE+4MB) to PA's [0, 4MB)
+  [KERNBASE>>PDXSHIFT] = (0) | PTE_P | PTE_W | PTE_PS,
+};
+
+//PAGEBREAK!
+// Blank page.
+//PAGEBREAK!
+// Blank page.
+//PAGEBREAK!
+// Blank page.
+
diff --git a/xv6-public/memide.c b/xv6-public/memide.c
new file mode 100644
index 0000000..ba267ac
--- /dev/null
+++ b/xv6-public/memide.c
@@ -0,0 +1,60 @@
+// Fake IDE disk; stores blocks in memory.
+// Useful for running kernel without scratch disk.
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+#include "traps.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "fs.h"
+#include "buf.h"
+
+extern uchar _binary_fs_img_start[], _binary_fs_img_size[];
+
+static int disksize;
+static uchar *memdisk;
+
+void
+ideinit(void)
+{
+  memdisk = _binary_fs_img_start;
+  disksize = (uint)_binary_fs_img_size/BSIZE;
+}
+
+// Interrupt handler.
+void
+ideintr(void)
+{
+  // no-op
+}
+
+// Sync buf with disk.
+// If B_DIRTY is set, write buf to disk, clear B_DIRTY, set B_VALID.
+// Else if B_VALID is not set, read buf from disk, set B_VALID.
+void
+iderw(struct buf *b)
+{
+  uchar *p;
+
+  if(!holdingsleep(&b->lock))
+    panic("iderw: buf not locked");
+  if((b->flags & (B_VALID|B_DIRTY)) == B_VALID)
+    panic("iderw: nothing to do");
+  if(b->dev != 1)
+    panic("iderw: request not for disk 1");
+  if(b->blockno >= disksize)
+    panic("iderw: block out of range");
+
+  p = memdisk + b->blockno*BSIZE;
+
+  if(b->flags & B_DIRTY){
+    b->flags &= ~B_DIRTY;
+    memmove(p, b->data, BSIZE);
+  } else
+    memmove(b->data, p, BSIZE);
+  b->flags |= B_VALID;
+}
diff --git a/xv6-public/memlayout.h b/xv6-public/memlayout.h
new file mode 100644
index 0000000..d1615f7
--- /dev/null
+++ b/xv6-public/memlayout.h
@@ -0,0 +1,15 @@
+// Memory layout
+
+#define EXTMEM  0x100000            // Start of extended memory
+#define PHYSTOP 0xE000000           // Top physical memory
+#define DEVSPACE 0xFE000000         // Other devices are at high addresses
+
+// Key addresses for address space layout (see kmap in vm.c for layout)
+#define KERNBASE 0x80000000         // First kernel virtual address
+#define KERNLINK (KERNBASE+EXTMEM)  // Address where kernel is linked
+
+#define V2P(a) (((uint) (a)) - KERNBASE)
+#define P2V(a) ((void *)(((char *) (a)) + KERNBASE))
+
+#define V2P_WO(x) ((x) - KERNBASE)    // same as V2P, but without casts
+#define P2V_WO(x) ((x) + KERNBASE)    // same as P2V, but without casts
diff --git a/xv6-public/mkdir.c b/xv6-public/mkdir.c
new file mode 100644
index 0000000..6e4c954
--- /dev/null
+++ b/xv6-public/mkdir.c
@@ -0,0 +1,23 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int
+main(int argc, char *argv[])
+{
+  int i;
+
+  if(argc < 2){
+    printf(2, "Usage: mkdir files...\n");
+    exit();
+  }
+
+  for(i = 1; i < argc; i++){
+    if(mkdir(argv[i]) < 0){
+      printf(2, "mkdir: %s failed to create\n", argv[i]);
+      break;
+    }
+  }
+
+  exit();
+}
diff --git a/xv6-public/mkfs.c b/xv6-public/mkfs.c
new file mode 100644
index 0000000..8e011a7
--- /dev/null
+++ b/xv6-public/mkfs.c
@@ -0,0 +1,297 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <assert.h>
+
+#define stat xv6_stat  // avoid clash with host struct stat
+#include "types.h"
+#include "fs.h"
+#include "stat.h"
+#include "param.h"
+
+#ifndef static_assert
+#define static_assert(a, b) do { switch (0) case 0: case (a): ; } while (0)
+#endif
+
+#define NINODES 200
+
+// Disk layout:
+// [ boot block | sb block | log | inode blocks | free bit map | data blocks ]
+
+int nbitmap = FSSIZE/(BSIZE*8) + 1;
+int ninodeblocks = NINODES / IPB + 1;
+int nlog = LOGSIZE;
+int nmeta;    // Number of meta blocks (boot, sb, nlog, inode, bitmap)
+int nblocks;  // Number of data blocks
+
+int fsfd;
+struct superblock sb;
+char zeroes[BSIZE];
+uint freeinode = 1;
+uint freeblock;
+
+
+void balloc(int);
+void wsect(uint, void*);
+void winode(uint, struct dinode*);
+void rinode(uint inum, struct dinode *ip);
+void rsect(uint sec, void *buf);
+uint ialloc(ushort type);
+void iappend(uint inum, void *p, int n);
+
+// convert to intel byte order
+ushort
+xshort(ushort x)
+{
+  ushort y;
+  uchar *a = (uchar*)&y;
+  a[0] = x;
+  a[1] = x >> 8;
+  return y;
+}
+
+uint
+xint(uint x)
+{
+  uint y;
+  uchar *a = (uchar*)&y;
+  a[0] = x;
+  a[1] = x >> 8;
+  a[2] = x >> 16;
+  a[3] = x >> 24;
+  return y;
+}
+
+int
+main(int argc, char *argv[])
+{
+  int i, cc, fd;
+  uint rootino, inum, off;
+  struct dirent de;
+  char buf[BSIZE];
+  struct dinode din;
+
+
+  static_assert(sizeof(int) == 4, "Integers must be 4 bytes!");
+
+  if(argc < 2){
+    fprintf(stderr, "Usage: mkfs fs.img files...\n");
+    exit(1);
+  }
+
+  assert((BSIZE % sizeof(struct dinode)) == 0);
+  assert((BSIZE % sizeof(struct dirent)) == 0);
+
+  fsfd = open(argv[1], O_RDWR|O_CREAT|O_TRUNC, 0666);
+  if(fsfd < 0){
+    perror(argv[1]);
+    exit(1);
+  }
+
+  // 1 fs block = 1 disk sector
+  nmeta = 2 + nlog + ninodeblocks + nbitmap;
+  nblocks = FSSIZE - nmeta;
+
+  sb.size = xint(FSSIZE);
+  sb.nblocks = xint(nblocks);
+  sb.ninodes = xint(NINODES);
+  sb.nlog = xint(nlog);
+  sb.logstart = xint(2);
+  sb.inodestart = xint(2+nlog);
+  sb.bmapstart = xint(2+nlog+ninodeblocks);
+
+  printf("nmeta %d (boot, super, log blocks %u inode blocks %u, bitmap blocks %u) blocks %d total %d\n",
+         nmeta, nlog, ninodeblocks, nbitmap, nblocks, FSSIZE);
+
+  freeblock = nmeta;     // the first free block that we can allocate
+
+  for(i = 0; i < FSSIZE; i++)
+    wsect(i, zeroes);
+
+  memset(buf, 0, sizeof(buf));
+  memmove(buf, &sb, sizeof(sb));
+  wsect(1, buf);
+
+  rootino = ialloc(T_DIR);
+  assert(rootino == ROOTINO);
+
+  bzero(&de, sizeof(de));
+  de.inum = xshort(rootino);
+  strcpy(de.name, ".");
+  iappend(rootino, &de, sizeof(de));
+
+  bzero(&de, sizeof(de));
+  de.inum = xshort(rootino);
+  strcpy(de.name, "..");
+  iappend(rootino, &de, sizeof(de));
+
+  for(i = 2; i < argc; i++){
+    assert(index(argv[i], '/') == 0);
+
+    if((fd = open(argv[i], 0)) < 0){
+      perror(argv[i]);
+      exit(1);
+    }
+
+    // Skip leading _ in name when writing to file system.
+    // The binaries are named _rm, _cat, etc. to keep the
+    // build operating system from trying to execute them
+    // in place of system binaries like rm and cat.
+    if(argv[i][0] == '_')
+      ++argv[i];
+
+    inum = ialloc(T_FILE);
+
+    bzero(&de, sizeof(de));
+    de.inum = xshort(inum);
+    strncpy(de.name, argv[i], DIRSIZ);
+    iappend(rootino, &de, sizeof(de));
+
+    while((cc = read(fd, buf, sizeof(buf))) > 0)
+      iappend(inum, buf, cc);
+
+    close(fd);
+  }
+
+  // fix size of root inode dir
+  rinode(rootino, &din);
+  off = xint(din.size);
+  off = ((off/BSIZE) + 1) * BSIZE;
+  din.size = xint(off);
+  winode(rootino, &din);
+
+  balloc(freeblock);
+
+  exit(0);
+}
+
+void
+wsect(uint sec, void *buf)
+{
+  if(lseek(fsfd, sec * BSIZE, 0) != sec * BSIZE){
+    perror("lseek");
+    exit(1);
+  }
+  if(write(fsfd, buf, BSIZE) != BSIZE){
+    perror("write");
+    exit(1);
+  }
+}
+
+void
+winode(uint inum, struct dinode *ip)
+{
+  char buf[BSIZE];
+  uint bn;
+  struct dinode *dip;
+
+  bn = IBLOCK(inum, sb);
+  rsect(bn, buf);
+  dip = ((struct dinode*)buf) + (inum % IPB);
+  *dip = *ip;
+  wsect(bn, buf);
+}
+
+void
+rinode(uint inum, struct dinode *ip)
+{
+  char buf[BSIZE];
+  uint bn;
+  struct dinode *dip;
+
+  bn = IBLOCK(inum, sb);
+  rsect(bn, buf);
+  dip = ((struct dinode*)buf) + (inum % IPB);
+  *ip = *dip;
+}
+
+void
+rsect(uint sec, void *buf)
+{
+  if(lseek(fsfd, sec * BSIZE, 0) != sec * BSIZE){
+    perror("lseek");
+    exit(1);
+  }
+  if(read(fsfd, buf, BSIZE) != BSIZE){
+    perror("read");
+    exit(1);
+  }
+}
+
+uint
+ialloc(ushort type)
+{
+  uint inum = freeinode++;
+  struct dinode din;
+
+  bzero(&din, sizeof(din));
+  din.type = xshort(type);
+  din.nlink = xshort(1);
+  din.size = xint(0);
+  winode(inum, &din);
+  return inum;
+}
+
+void
+balloc(int used)
+{
+  uchar buf[BSIZE];
+  int i;
+
+  printf("balloc: first %d blocks have been allocated\n", used);
+  assert(used < BSIZE*8);
+  bzero(buf, BSIZE);
+  for(i = 0; i < used; i++){
+    buf[i/8] = buf[i/8] | (0x1 << (i%8));
+  }
+  printf("balloc: write bitmap block at sector %d\n", sb.bmapstart);
+  wsect(sb.bmapstart, buf);
+}
+
+#define min(a, b) ((a) < (b) ? (a) : (b))
+
+void
+iappend(uint inum, void *xp, int n)
+{
+  char *p = (char*)xp;
+  uint fbn, off, n1;
+  struct dinode din;
+  char buf[BSIZE];
+  uint indirect[NINDIRECT];
+  uint x;
+
+  rinode(inum, &din);
+  off = xint(din.size);
+  // printf("append inum %d at off %d sz %d\n", inum, off, n);
+  while(n > 0){
+    fbn = off / BSIZE;
+    assert(fbn < MAXFILE);
+    if(fbn < NDIRECT){
+      if(xint(din.addrs[fbn]) == 0){
+        din.addrs[fbn] = xint(freeblock++);
+      }
+      x = xint(din.addrs[fbn]);
+    } else {
+      if(xint(din.addrs[NDIRECT]) == 0){
+        din.addrs[NDIRECT] = xint(freeblock++);
+      }
+      rsect(xint(din.addrs[NDIRECT]), (char*)indirect);
+      if(indirect[fbn - NDIRECT] == 0){
+        indirect[fbn - NDIRECT] = xint(freeblock++);
+        wsect(xint(din.addrs[NDIRECT]), (char*)indirect);
+      }
+      x = xint(indirect[fbn-NDIRECT]);
+    }
+    n1 = min(n, (fbn + 1) * BSIZE - off);
+    rsect(x, buf);
+    bcopy(p, buf + off - (fbn * BSIZE), n1);
+    wsect(x, buf);
+    n -= n1;
+    off += n1;
+    p += n1;
+  }
+  din.size = xint(off);
+  winode(inum, &din);
+}
diff --git a/xv6-public/mmu.h b/xv6-public/mmu.h
new file mode 100644
index 0000000..a82d8e2
--- /dev/null
+++ b/xv6-public/mmu.h
@@ -0,0 +1,181 @@
+// This file contains definitions for the
+// x86 memory management unit (MMU).
+
+// Eflags register
+#define FL_IF           0x00000200      // Interrupt Enable
+
+// Control Register flags
+#define CR0_PE          0x00000001      // Protection Enable
+#define CR0_WP          0x00010000      // Write Protect
+#define CR0_PG          0x80000000      // Paging
+
+#define CR4_PSE         0x00000010      // Page size extension
+
+// various segment selectors.
+#define SEG_KCODE 1  // kernel code
+#define SEG_KDATA 2  // kernel data+stack
+#define SEG_UCODE 3  // user code
+#define SEG_UDATA 4  // user data+stack
+#define SEG_TSS   5  // this process's task state
+
+// cpu->gdt[NSEGS] holds the above segments.
+#define NSEGS     6
+
+#ifndef __ASSEMBLER__
+// Segment Descriptor
+struct segdesc {
+  uint lim_15_0 : 16;  // Low bits of segment limit
+  uint base_15_0 : 16; // Low bits of segment base address
+  uint base_23_16 : 8; // Middle bits of segment base address
+  uint type : 4;       // Segment type (see STS_ constants)
+  uint s : 1;          // 0 = system, 1 = application
+  uint dpl : 2;        // Descriptor Privilege Level
+  uint p : 1;          // Present
+  uint lim_19_16 : 4;  // High bits of segment limit
+  uint avl : 1;        // Unused (available for software use)
+  uint rsv1 : 1;       // Reserved
+  uint db : 1;         // 0 = 16-bit segment, 1 = 32-bit segment
+  uint g : 1;          // Granularity: limit scaled by 4K when set
+  uint base_31_24 : 8; // High bits of segment base address
+};
+
+// Normal segment
+#define SEG(type, base, lim, dpl) (struct segdesc)    \
+{ ((lim) >> 12) & 0xffff, (uint)(base) & 0xffff,      \
+  ((uint)(base) >> 16) & 0xff, type, 1, dpl, 1,       \
+  (uint)(lim) >> 28, 0, 0, 1, 1, (uint)(base) >> 24 }
+#define SEG16(type, base, lim, dpl) (struct segdesc)  \
+{ (lim) & 0xffff, (uint)(base) & 0xffff,              \
+  ((uint)(base) >> 16) & 0xff, type, 1, dpl, 1,       \
+  (uint)(lim) >> 16, 0, 0, 1, 0, (uint)(base) >> 24 }
+#endif
+
+#define DPL_USER    0x3     // User DPL
+
+// Application segment type bits
+#define STA_X       0x8     // Executable segment
+#define STA_W       0x2     // Writeable (non-executable segments)
+#define STA_R       0x2     // Readable (executable segments)
+
+// System segment type bits
+#define STS_T32A    0x9     // Available 32-bit TSS
+#define STS_IG32    0xE     // 32-bit Interrupt Gate
+#define STS_TG32    0xF     // 32-bit Trap Gate
+
+// A virtual address 'la' has a three-part structure as follows:
+//
+// +--------10------+-------10-------+---------12----------+
+// | Page Directory |   Page Table   | Offset within Page  |
+// |      Index     |      Index     |                     |
+// +----------------+----------------+---------------------+
+//  \--- PDX(va) --/ \--- PTX(va) --/
+
+// page directory index
+#define PDX(va)         (((uint)(va) >> PDXSHIFT) & 0x3FF)
+
+// page table index
+#define PTX(va)         (((uint)(va) >> PTXSHIFT) & 0x3FF)
+
+// construct virtual address from indexes and offset
+#define PGADDR(d, t, o) ((uint)((d) << PDXSHIFT | (t) << PTXSHIFT | (o)))
+
+// Page directory and page table constants.
+#define NPDENTRIES      1024    // # directory entries per page directory
+#define NPTENTRIES      1024    // # PTEs per page table
+#define PGSIZE          4096    // bytes mapped by a page
+
+#define PTXSHIFT        12      // offset of PTX in a linear address
+#define PDXSHIFT        22      // offset of PDX in a linear address
+
+#define PGROUNDUP(sz)  (((sz)+PGSIZE-1) & ~(PGSIZE-1))
+#define PGROUNDDOWN(a) (((a)) & ~(PGSIZE-1))
+
+// Page table/directory entry flags.
+#define PTE_P           0x001   // Present
+#define PTE_W           0x002   // Writeable
+#define PTE_U           0x004   // User
+#define PTE_PS          0x080   // Page Size
+
+// Address in page table or page directory entry
+#define PTE_ADDR(pte)   ((uint)(pte) & ~0xFFF)
+#define PTE_FLAGS(pte)  ((uint)(pte) &  0xFFF)
+
+#ifndef __ASSEMBLER__
+typedef uint pte_t;
+
+// Task state segment format
+struct taskstate {
+  uint link;         // Old ts selector
+  uint esp0;         // Stack pointers and segment selectors
+  ushort ss0;        //   after an increase in privilege level
+  ushort padding1;
+  uint *esp1;
+  ushort ss1;
+  ushort padding2;
+  uint *esp2;
+  ushort ss2;
+  ushort padding3;
+  void *cr3;         // Page directory base
+  uint *eip;         // Saved state from last task switch
+  uint eflags;
+  uint eax;          // More saved state (registers)
+  uint ecx;
+  uint edx;
+  uint ebx;
+  uint *esp;
+  uint *ebp;
+  uint esi;
+  uint edi;
+  ushort es;         // Even more saved state (segment selectors)
+  ushort padding4;
+  ushort cs;
+  ushort padding5;
+  ushort ss;
+  ushort padding6;
+  ushort ds;
+  ushort padding7;
+  ushort fs;
+  ushort padding8;
+  ushort gs;
+  ushort padding9;
+  ushort ldt;
+  ushort padding10;
+  ushort t;          // Trap on task switch
+  ushort iomb;       // I/O map base address
+};
+
+// Gate descriptors for interrupts and traps
+struct gatedesc {
+  uint off_15_0 : 16;   // low 16 bits of offset in segment
+  uint cs : 16;         // code segment selector
+  uint args : 5;        // # args, 0 for interrupt/trap gates
+  uint rsv1 : 3;        // reserved(should be zero I guess)
+  uint type : 4;        // type(STS_{IG32,TG32})
+  uint s : 1;           // must be 0 (system)
+  uint dpl : 2;         // descriptor(meaning new) privilege level
+  uint p : 1;           // Present
+  uint off_31_16 : 16;  // high bits of offset in segment
+};
+
+// Set up a normal interrupt/trap gate descriptor.
+// - istrap: 1 for a trap (= exception) gate, 0 for an interrupt gate.
+//   interrupt gate clears FL_IF, trap gate leaves FL_IF alone
+// - sel: Code segment selector for interrupt/trap handler
+// - off: Offset in code segment for interrupt/trap handler
+// - dpl: Descriptor Privilege Level -
+//        the privilege level required for software to invoke
+//        this interrupt/trap gate explicitly using an int instruction.
+#define SETGATE(gate, istrap, sel, off, d)                \
+{                                                         \
+  (gate).off_15_0 = (uint)(off) & 0xffff;                \
+  (gate).cs = (sel);                                      \
+  (gate).args = 0;                                        \
+  (gate).rsv1 = 0;                                        \
+  (gate).type = (istrap) ? STS_TG32 : STS_IG32;           \
+  (gate).s = 0;                                           \
+  (gate).dpl = (d);                                       \
+  (gate).p = 1;                                           \
+  (gate).off_31_16 = (uint)(off) >> 16;                  \
+}
+
+#endif
diff --git a/xv6-public/mp.c b/xv6-public/mp.c
new file mode 100644
index 0000000..79bb0ad
--- /dev/null
+++ b/xv6-public/mp.c
@@ -0,0 +1,139 @@
+// Multiprocessor support
+// Search memory for MP description structures.
+// http://developer.intel.com/design/pentium/datashts/24201606.pdf
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mp.h"
+#include "x86.h"
+#include "mmu.h"
+#include "proc.h"
+
+struct cpu cpus[NCPU];
+int ncpu;
+uchar ioapicid;
+
+static uchar
+sum(uchar *addr, int len)
+{
+  int i, sum;
+
+  sum = 0;
+  for(i=0; i<len; i++)
+    sum += addr[i];
+  return sum;
+}
+
+// Look for an MP structure in the len bytes at addr.
+static struct mp*
+mpsearch1(uint a, int len)
+{
+  uchar *e, *p, *addr;
+
+  addr = P2V(a);
+  e = addr+len;
+  for(p = addr; p < e; p += sizeof(struct mp))
+    if(memcmp(p, "_MP_", 4) == 0 && sum(p, sizeof(struct mp)) == 0)
+      return (struct mp*)p;
+  return 0;
+}
+
+// Search for the MP Floating Pointer Structure, which according to the
+// spec is in one of the following three locations:
+// 1) in the first KB of the EBDA;
+// 2) in the last KB of system base memory;
+// 3) in the BIOS ROM between 0xE0000 and 0xFFFFF.
+static struct mp*
+mpsearch(void)
+{
+  uchar *bda;
+  uint p;
+  struct mp *mp;
+
+  bda = (uchar *) P2V(0x400);
+  if((p = ((bda[0x0F]<<8)| bda[0x0E]) << 4)){
+    if((mp = mpsearch1(p, 1024)))
+      return mp;
+  } else {
+    p = ((bda[0x14]<<8)|bda[0x13])*1024;
+    if((mp = mpsearch1(p-1024, 1024)))
+      return mp;
+  }
+  return mpsearch1(0xF0000, 0x10000);
+}
+
+// Search for an MP configuration table.  For now,
+// don't accept the default configurations (physaddr == 0).
+// Check for correct signature, calculate the checksum and,
+// if correct, check the version.
+// To do: check extended table checksum.
+static struct mpconf*
+mpconfig(struct mp **pmp)
+{
+  struct mpconf *conf;
+  struct mp *mp;
+
+  if((mp = mpsearch()) == 0 || mp->physaddr == 0)
+    return 0;
+  conf = (struct mpconf*) P2V((uint) mp->physaddr);
+  if(memcmp(conf, "PCMP", 4) != 0)
+    return 0;
+  if(conf->version != 1 && conf->version != 4)
+    return 0;
+  if(sum((uchar*)conf, conf->length) != 0)
+    return 0;
+  *pmp = mp;
+  return conf;
+}
+
+void
+mpinit(void)
+{
+  uchar *p, *e;
+  int ismp;
+  struct mp *mp;
+  struct mpconf *conf;
+  struct mpproc *proc;
+  struct mpioapic *ioapic;
+
+  if((conf = mpconfig(&mp)) == 0)
+    panic("Expect to run on an SMP");
+  ismp = 1;
+  lapic = (uint*)conf->lapicaddr;
+  for(p=(uchar*)(conf+1), e=(uchar*)conf+conf->length; p<e; ){
+    switch(*p){
+    case MPPROC:
+      proc = (struct mpproc*)p;
+      if(ncpu < NCPU) {
+        cpus[ncpu].apicid = proc->apicid;  // apicid may differ from ncpu
+        ncpu++;
+      }
+      p += sizeof(struct mpproc);
+      continue;
+    case MPIOAPIC:
+      ioapic = (struct mpioapic*)p;
+      ioapicid = ioapic->apicno;
+      p += sizeof(struct mpioapic);
+      continue;
+    case MPBUS:
+    case MPIOINTR:
+    case MPLINTR:
+      p += 8;
+      continue;
+    default:
+      ismp = 0;
+      break;
+    }
+  }
+  if(!ismp)
+    panic("Didn't find a suitable machine");
+
+  if(mp->imcrp){
+    // Bochs doesn't support IMCR, so this doesn't run on Bochs.
+    // But it would on real hardware.
+    outb(0x22, 0x70);   // Select IMCR
+    outb(0x23, inb(0x23) | 1);  // Mask external interrupts.
+  }
+}
diff --git a/xv6-public/mp.h b/xv6-public/mp.h
new file mode 100644
index 0000000..4d17283
--- /dev/null
+++ b/xv6-public/mp.h
@@ -0,0 +1,56 @@
+// See MultiProcessor Specification Version 1.[14]
+
+struct mp {             // floating pointer
+  uchar signature[4];           // "_MP_"
+  void *physaddr;               // phys addr of MP config table
+  uchar length;                 // 1
+  uchar specrev;                // [14]
+  uchar checksum;               // all bytes must add up to 0
+  uchar type;                   // MP system config type
+  uchar imcrp;
+  uchar reserved[3];
+};
+
+struct mpconf {         // configuration table header
+  uchar signature[4];           // "PCMP"
+  ushort length;                // total table length
+  uchar version;                // [14]
+  uchar checksum;               // all bytes must add up to 0
+  uchar product[20];            // product id
+  uint *oemtable;               // OEM table pointer
+  ushort oemlength;             // OEM table length
+  ushort entry;                 // entry count
+  uint *lapicaddr;              // address of local APIC
+  ushort xlength;               // extended table length
+  uchar xchecksum;              // extended table checksum
+  uchar reserved;
+};
+
+struct mpproc {         // processor table entry
+  uchar type;                   // entry type (0)
+  uchar apicid;                 // local APIC id
+  uchar version;                // local APIC verison
+  uchar flags;                  // CPU flags
+    #define MPBOOT 0x02           // This proc is the bootstrap processor.
+  uchar signature[4];           // CPU signature
+  uint feature;                 // feature flags from CPUID instruction
+  uchar reserved[8];
+};
+
+struct mpioapic {       // I/O APIC table entry
+  uchar type;                   // entry type (2)
+  uchar apicno;                 // I/O APIC id
+  uchar version;                // I/O APIC version
+  uchar flags;                  // I/O APIC flags
+  uint *addr;                  // I/O APIC address
+};
+
+// Table entry types
+#define MPPROC    0x00  // One per processor
+#define MPBUS     0x01  // One per bus
+#define MPIOAPIC  0x02  // One per I/O APIC
+#define MPIOINTR  0x03  // One per bus interrupt source
+#define MPLINTR   0x04  // One per system interrupt source
+
+//PAGEBREAK!
+// Blank page.
diff --git a/xv6-public/param.h b/xv6-public/param.h
new file mode 100644
index 0000000..a7e90ef
--- /dev/null
+++ b/xv6-public/param.h
@@ -0,0 +1,14 @@
+#define NPROC        64  // maximum number of processes
+#define KSTACKSIZE 4096  // size of per-process kernel stack
+#define NCPU          8  // maximum number of CPUs
+#define NOFILE       16  // open files per process
+#define NFILE       100  // open files per system
+#define NINODE       50  // maximum number of active i-nodes
+#define NDEV         10  // maximum major device number
+#define ROOTDEV       1  // device number of file system root disk
+#define MAXARG       32  // max exec arguments
+#define MAXOPBLOCKS  10  // max # of blocks any FS op writes
+#define LOGSIZE      (MAXOPBLOCKS*3)  // max data blocks in on-disk log
+#define NBUF         (MAXOPBLOCKS*3)  // size of disk block cache
+#define FSSIZE       1000  // size of file system in blocks
+
diff --git a/xv6-public/picirq.c b/xv6-public/picirq.c
new file mode 100644
index 0000000..e26957f
--- /dev/null
+++ b/xv6-public/picirq.c
@@ -0,0 +1,19 @@
+#include "types.h"
+#include "x86.h"
+#include "traps.h"
+
+// I/O Addresses of the two programmable interrupt controllers
+#define IO_PIC1         0x20    // Master (IRQs 0-7)
+#define IO_PIC2         0xA0    // Slave (IRQs 8-15)
+
+// Don't use the 8259A interrupt controllers.  Xv6 assumes SMP hardware.
+void
+picinit(void)
+{
+  // mask all interrupts
+  outb(IO_PIC1+1, 0xFF);
+  outb(IO_PIC2+1, 0xFF);
+}
+
+//PAGEBREAK!
+// Blank page.
diff --git a/xv6-public/pipe.c b/xv6-public/pipe.c
new file mode 100644
index 0000000..e9abe7f
--- /dev/null
+++ b/xv6-public/pipe.c
@@ -0,0 +1,121 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "mmu.h"
+#include "proc.h"
+#include "fs.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "file.h"
+
+#define PIPESIZE 512
+
+struct pipe {
+  struct spinlock lock;
+  char data[PIPESIZE];
+  uint nread;     // number of bytes read
+  uint nwrite;    // number of bytes written
+  int readopen;   // read fd is still open
+  int writeopen;  // write fd is still open
+};
+
+int
+pipealloc(struct file **f0, struct file **f1)
+{
+  struct pipe *p;
+
+  p = 0;
+  *f0 = *f1 = 0;
+  if((*f0 = filealloc()) == 0 || (*f1 = filealloc()) == 0)
+    goto bad;
+  if((p = (struct pipe*)kalloc()) == 0)
+    goto bad;
+  p->readopen = 1;
+  p->writeopen = 1;
+  p->nwrite = 0;
+  p->nread = 0;
+  initlock(&p->lock, "pipe");
+  (*f0)->type = FD_PIPE;
+  (*f0)->readable = 1;
+  (*f0)->writable = 0;
+  (*f0)->pipe = p;
+  (*f1)->type = FD_PIPE;
+  (*f1)->readable = 0;
+  (*f1)->writable = 1;
+  (*f1)->pipe = p;
+  return 0;
+
+//PAGEBREAK: 20
+ bad:
+  if(p)
+    kfree((char*)p);
+  if(*f0)
+    fileclose(*f0);
+  if(*f1)
+    fileclose(*f1);
+  return -1;
+}
+
+void
+pipeclose(struct pipe *p, int writable)
+{
+  acquire(&p->lock);
+  if(writable){
+    p->writeopen = 0;
+    wakeup(&p->nread);
+  } else {
+    p->readopen = 0;
+    wakeup(&p->nwrite);
+  }
+  if(p->readopen == 0 && p->writeopen == 0){
+    release(&p->lock);
+    kfree((char*)p);
+  } else
+    release(&p->lock);
+}
+
+//PAGEBREAK: 40
+int
+pipewrite(struct pipe *p, char *addr, int n)
+{
+  int i;
+
+  acquire(&p->lock);
+  for(i = 0; i < n; i++){
+    while(p->nwrite == p->nread + PIPESIZE){  //DOC: pipewrite-full
+      if(p->readopen == 0 || myproc()->killed){
+        release(&p->lock);
+        return -1;
+      }
+      wakeup(&p->nread);
+      sleep(&p->nwrite, &p->lock);  //DOC: pipewrite-sleep
+    }
+    p->data[p->nwrite++ % PIPESIZE] = addr[i];
+  }
+  wakeup(&p->nread);  //DOC: pipewrite-wakeup1
+  release(&p->lock);
+  return n;
+}
+
+int
+piperead(struct pipe *p, char *addr, int n)
+{
+  int i;
+
+  acquire(&p->lock);
+  while(p->nread == p->nwrite && p->writeopen){  //DOC: pipe-empty
+    if(myproc()->killed){
+      release(&p->lock);
+      return -1;
+    }
+    sleep(&p->nread, &p->lock); //DOC: piperead-sleep
+  }
+  for(i = 0; i < n; i++){  //DOC: piperead-copy
+    if(p->nread == p->nwrite)
+      break;
+    addr[i] = p->data[p->nread++ % PIPESIZE];
+  }
+  wakeup(&p->nwrite);  //DOC: piperead-wakeup
+  release(&p->lock);
+  return i;
+}
diff --git a/xv6-public/pr.pl b/xv6-public/pr.pl
new file mode 100644
index 0000000..46905bd
--- /dev/null
+++ b/xv6-public/pr.pl
@@ -0,0 +1,36 @@
+#!/usr/bin/perl
+
+use POSIX qw(strftime);
+
+if($ARGV[0] eq "-h"){
+	shift @ARGV;
+	$h = $ARGV[0];
+	shift @ARGV;
+}else{
+	$h = $ARGV[0];
+}
+
+$page = 0;
+$now = strftime "%b %e %H:%M %Y", localtime;
+
+@lines = <>;
+for($i=0; $i<@lines; $i+=50){
+	print "\n\n";
+	++$page;
+	print "$now  $h  Page $page\n";
+	print "\n\n";
+	for($j=$i; $j<@lines && $j<$i +50; $j++){
+		$lines[$j] =~ s!//DOC.*!!;
+		print $lines[$j];
+	}
+	for(; $j<$i+50; $j++){
+		print "\n";
+	}
+	$sheet = "";
+	if($lines[$i] =~ /^([0-9][0-9])[0-9][0-9] /){
+		$sheet = "Sheet $1";
+	}
+	print "\n\n";
+	print "$sheet\n";
+	print "\n\n";
+}
diff --git a/xv6-public/printf.c b/xv6-public/printf.c
new file mode 100644
index 0000000..b3298aa
--- /dev/null
+++ b/xv6-public/printf.c
@@ -0,0 +1,85 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+static void
+putc(int fd, char c)
+{
+  write(fd, &c, 1);
+}
+
+static void
+printint(int fd, int xx, int base, int sgn)
+{
+  static char digits[] = "0123456789ABCDEF";
+  char buf[16];
+  int i, neg;
+  uint x;
+
+  neg = 0;
+  if(sgn && xx < 0){
+    neg = 1;
+    x = -xx;
+  } else {
+    x = xx;
+  }
+
+  i = 0;
+  do{
+    buf[i++] = digits[x % base];
+  }while((x /= base) != 0);
+  if(neg)
+    buf[i++] = '-';
+
+  while(--i >= 0)
+    putc(fd, buf[i]);
+}
+
+// Print to the given fd. Only understands %d, %x, %p, %s.
+void
+printf(int fd, const char *fmt, ...)
+{
+  char *s;
+  int c, i, state;
+  uint *ap;
+
+  state = 0;
+  ap = (uint*)(void*)&fmt + 1;
+  for(i = 0; fmt[i]; i++){
+    c = fmt[i] & 0xff;
+    if(state == 0){
+      if(c == '%'){
+        state = '%';
+      } else {
+        putc(fd, c);
+      }
+    } else if(state == '%'){
+      if(c == 'd'){
+        printint(fd, *ap, 10, 1);
+        ap++;
+      } else if(c == 'x' || c == 'p'){
+        printint(fd, *ap, 16, 0);
+        ap++;
+      } else if(c == 's'){
+        s = (char*)*ap;
+        ap++;
+        if(s == 0)
+          s = "(null)";
+        while(*s != 0){
+          putc(fd, *s);
+          s++;
+        }
+      } else if(c == 'c'){
+        putc(fd, *ap);
+        ap++;
+      } else if(c == '%'){
+        putc(fd, c);
+      } else {
+        // Unknown % sequence.  Print it to draw attention.
+        putc(fd, '%');
+        putc(fd, c);
+      }
+      state = 0;
+    }
+  }
+}
diff --git a/xv6-public/printpcs b/xv6-public/printpcs
new file mode 100644
index 0000000..81d039b
--- /dev/null
+++ b/xv6-public/printpcs
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# Decode the symbols from a panic EIP list
+
+# Find a working addr2line
+for p in i386-jos-elf-addr2line addr2line; do
+    if which $p 2>&1 >/dev/null && \
+       $p -h 2>&1 | grep -q '\belf32-i386\b'; then
+        break
+    fi
+done
+
+# Enable as much pretty-printing as this addr2line can do
+$p $($p -h | grep ' -[aipsf] ' | awk '{print $1}') -e kernel "$@"
diff --git a/xv6-public/proc.c b/xv6-public/proc.c
new file mode 100644
index 0000000..8b6b996
--- /dev/null
+++ b/xv6-public/proc.c
@@ -0,0 +1,534 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "x86.h"
+#include "proc.h"
+#include "spinlock.h"
+
+struct {
+  struct spinlock lock;
+  struct proc proc[NPROC];
+} ptable;
+
+static struct proc *initproc;
+
+int nextpid = 1;
+extern void forkret(void);
+extern void trapret(void);
+
+static void wakeup1(void *chan);
+
+void
+pinit(void)
+{
+  initlock(&ptable.lock, "ptable");
+}
+
+// Must be called with interrupts disabled
+int
+cpuid() {
+  return mycpu()-cpus;
+}
+
+// Must be called with interrupts disabled to avoid the caller being
+// rescheduled between reading lapicid and running through the loop.
+struct cpu*
+mycpu(void)
+{
+  int apicid, i;
+  
+  if(readeflags()&FL_IF)
+    panic("mycpu called with interrupts enabled\n");
+  
+  apicid = lapicid();
+  // APIC IDs are not guaranteed to be contiguous. Maybe we should have
+  // a reverse map, or reserve a register to store &cpus[i].
+  for (i = 0; i < ncpu; ++i) {
+    if (cpus[i].apicid == apicid)
+      return &cpus[i];
+  }
+  panic("unknown apicid\n");
+}
+
+// Disable interrupts so that we are not rescheduled
+// while reading proc from the cpu structure
+struct proc*
+myproc(void) {
+  struct cpu *c;
+  struct proc *p;
+  pushcli();
+  c = mycpu();
+  p = c->proc;
+  popcli();
+  return p;
+}
+
+//PAGEBREAK: 32
+// Look in the process table for an UNUSED proc.
+// If found, change state to EMBRYO and initialize
+// state required to run in the kernel.
+// Otherwise return 0.
+static struct proc*
+allocproc(void)
+{
+  struct proc *p;
+  char *sp;
+
+  acquire(&ptable.lock);
+
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++)
+    if(p->state == UNUSED)
+      goto found;
+
+  release(&ptable.lock);
+  return 0;
+
+found:
+  p->state = EMBRYO;
+  p->pid = nextpid++;
+  p->ticks = 0;
+  release(&ptable.lock);
+
+  // Allocate kernel stack.
+  if((p->kstack = kalloc()) == 0){
+    p->state = UNUSED;
+    return 0;
+  }
+  sp = p->kstack + KSTACKSIZE;
+
+  // Leave room for trap frame.
+  sp -= sizeof *p->tf;
+  p->tf = (struct trapframe*)sp;
+
+  // Set up new context to start executing at forkret,
+  // which returns to trapret.
+  sp -= 4;
+  *(uint*)sp = (uint)trapret;
+
+  sp -= sizeof *p->context;
+  p->context = (struct context*)sp;
+  memset(p->context, 0, sizeof *p->context);
+  p->context->eip = (uint)forkret;
+
+  return p;
+}
+
+//PAGEBREAK: 32
+// Set up first user process.
+void
+userinit(void)
+{
+  struct proc *p;
+  extern char _binary_initcode_start[], _binary_initcode_size[];
+
+  p = allocproc();
+  
+  initproc = p;
+  if((p->pgdir = setupkvm()) == 0)
+    panic("userinit: out of memory?");
+  inituvm(p->pgdir, _binary_initcode_start, (int)_binary_initcode_size);
+  p->sz = PGSIZE;
+  memset(p->tf, 0, sizeof(*p->tf));
+  p->tf->cs = (SEG_UCODE << 3) | DPL_USER;
+  p->tf->ds = (SEG_UDATA << 3) | DPL_USER;
+  p->tf->es = p->tf->ds;
+  p->tf->ss = p->tf->ds;
+  p->tf->eflags = FL_IF;
+  p->tf->esp = PGSIZE;
+  p->tf->eip = 0;  // beginning of initcode.S
+
+  safestrcpy(p->name, "initcode", sizeof(p->name));
+  p->cwd = namei("/");
+
+  // this assignment to p->state lets other cores
+  // run this process. the acquire forces the above
+  // writes to be visible, and the lock is also needed
+  // because the assignment might not be atomic.
+  acquire(&ptable.lock);
+
+  p->state = RUNNABLE;
+
+  release(&ptable.lock);
+}
+
+// Grow current process's memory by n bytes.
+// Return 0 on success, -1 on failure.
+int
+growproc(int n)
+{
+  uint sz;
+  struct proc *curproc = myproc();
+
+  sz = curproc->sz;
+  if(n > 0){
+    if((sz = allocuvm(curproc->pgdir, sz, sz + n)) == 0)
+      return -1;
+  } else if(n < 0){
+    if((sz = deallocuvm(curproc->pgdir, sz, sz + n)) == 0)
+      return -1;
+  }
+  curproc->sz = sz;
+  switchuvm(curproc);
+  return 0;
+}
+
+// Create a new process copying p as the parent.
+// Sets up stack to return as if from system call.
+// Caller must set state of returned proc to RUNNABLE.
+int
+fork(void)
+{
+  int i, pid;
+  struct proc *np;
+  struct proc *curproc = myproc();
+
+  // Allocate process.
+  if((np = allocproc()) == 0){
+    return -1;
+  }
+
+  // Copy process state from proc.
+  if((np->pgdir = copyuvm(curproc->pgdir, curproc->sz)) == 0){
+    kfree(np->kstack);
+    np->kstack = 0;
+    np->state = UNUSED;
+    return -1;
+  }
+  np->sz = curproc->sz;
+  np->parent = curproc;
+  *np->tf = *curproc->tf;
+
+  // Clear %eax so that fork returns 0 in the child.
+  np->tf->eax = 0;
+
+  for(i = 0; i < NOFILE; i++)
+    if(curproc->ofile[i])
+      np->ofile[i] = filedup(curproc->ofile[i]);
+  np->cwd = idup(curproc->cwd);
+
+  safestrcpy(np->name, curproc->name, sizeof(curproc->name));
+
+  pid = np->pid;
+
+  acquire(&ptable.lock);
+
+  np->state = RUNNABLE;
+
+  release(&ptable.lock);
+
+  return pid;
+}
+
+// Exit the current process.  Does not return.
+// An exited process remains in the zombie state
+// until its parent calls wait() to find out it exited.
+void
+exit(void)
+{
+  struct proc *curproc = myproc();
+  struct proc *p;
+  int fd;
+
+  if(curproc == initproc)
+    panic("init exiting");
+
+  // Close all open files.
+  for(fd = 0; fd < NOFILE; fd++){
+    if(curproc->ofile[fd]){
+      fileclose(curproc->ofile[fd]);
+      curproc->ofile[fd] = 0;
+    }
+  }
+
+  begin_op();
+  iput(curproc->cwd);
+  end_op();
+  curproc->cwd = 0;
+
+  acquire(&ptable.lock);
+
+  // Parent might be sleeping in wait().
+  wakeup1(curproc->parent);
+
+  // Pass abandoned children to init.
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+    if(p->parent == curproc){
+      p->parent = initproc;
+      if(p->state == ZOMBIE)
+        wakeup1(initproc);
+    }
+  }
+
+  // Jump into the scheduler, never to return.
+  curproc->state = ZOMBIE;
+  sched();
+  panic("zombie exit");
+}
+
+// Wait for a child process to exit and return its pid.
+// Return -1 if this process has no children.
+int
+wait(void)
+{
+  struct proc *p;
+  int havekids, pid;
+  struct proc *curproc = myproc();
+  
+  acquire(&ptable.lock);
+  for(;;){
+    // Scan through table looking for exited children.
+    havekids = 0;
+    for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+      if(p->parent != curproc)
+        continue;
+      havekids = 1;
+      if(p->state == ZOMBIE){
+        // Found one.
+        pid = p->pid;
+        kfree(p->kstack);
+        p->kstack = 0;
+        freevm(p->pgdir);
+        p->pid = 0;
+        p->parent = 0;
+        p->name[0] = 0;
+        p->killed = 0;
+        p->state = UNUSED;
+        release(&ptable.lock);
+        return pid;
+      }
+    }
+
+    // No point waiting if we don't have any children.
+    if(!havekids || curproc->killed){
+      release(&ptable.lock);
+      return -1;
+    }
+
+    // Wait for children to exit.  (See wakeup1 call in proc_exit.)
+    sleep(curproc, &ptable.lock);  //DOC: wait-sleep
+  }
+}
+
+//PAGEBREAK: 42
+// Per-CPU process scheduler.
+// Each CPU calls scheduler() after setting itself up.
+// Scheduler never returns.  It loops, doing:
+//  - choose a process to run
+//  - swtch to start running that process
+//  - eventually that process transfers control
+//      via swtch back to the scheduler.
+void
+scheduler(void)
+{
+  struct proc *p;
+  struct cpu *c = mycpu();
+  c->proc = 0;
+  
+  for(;;){
+    // Enable interrupts on this processor.
+    sti();
+
+    // Loop over process table looking for process to run.
+    acquire(&ptable.lock);
+    for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+      if(p->state != RUNNABLE)
+        continue;
+
+      // Switch to chosen process.  It is the process's job
+      // to release ptable.lock and then reacquire it
+      // before jumping back to us.
+      c->proc = p;
+      switchuvm(p);
+      p->state = RUNNING;
+
+      swtch(&(c->scheduler), p->context);
+      switchkvm();
+
+      // Process is done running for now.
+      // It should have changed its p->state before coming back.
+      c->proc = 0;
+    }
+    release(&ptable.lock);
+
+  }
+}
+
+// Enter scheduler.  Must hold only ptable.lock
+// and have changed proc->state. Saves and restores
+// intena because intena is a property of this
+// kernel thread, not this CPU. It should
+// be proc->intena and proc->ncli, but that would
+// break in the few places where a lock is held but
+// there's no process.
+void
+sched(void)
+{
+  int intena;
+  struct proc *p = myproc();
+
+  if(!holding(&ptable.lock))
+    panic("sched ptable.lock");
+  if(mycpu()->ncli != 1)
+    panic("sched locks");
+  if(p->state == RUNNING)
+    panic("sched running");
+  if(readeflags()&FL_IF)
+    panic("sched interruptible");
+  intena = mycpu()->intena;
+  swtch(&p->context, mycpu()->scheduler);
+  mycpu()->intena = intena;
+}
+
+// Give up the CPU for one scheduling round.
+void
+yield(void)
+{
+  acquire(&ptable.lock);  //DOC: yieldlock
+  myproc()->state = RUNNABLE;
+  sched();
+  release(&ptable.lock);
+}
+
+// A fork child's very first scheduling by scheduler()
+// will swtch here.  "Return" to user space.
+void
+forkret(void)
+{
+  static int first = 1;
+  // Still holding ptable.lock from scheduler.
+  release(&ptable.lock);
+
+  if (first) {
+    // Some initialization functions must be run in the context
+    // of a regular process (e.g., they call sleep), and thus cannot
+    // be run from main().
+    first = 0;
+    iinit(ROOTDEV);
+    initlog(ROOTDEV);
+  }
+
+  // Return to "caller", actually trapret (see allocproc).
+}
+
+// Atomically release lock and sleep on chan.
+// Reacquires lock when awakened.
+void
+sleep(void *chan, struct spinlock *lk)
+{
+  struct proc *p = myproc();
+  
+  if(p == 0)
+    panic("sleep");
+
+  if(lk == 0)
+    panic("sleep without lk");
+
+  // Must acquire ptable.lock in order to
+  // change p->state and then call sched.
+  // Once we hold ptable.lock, we can be
+  // guaranteed that we won't miss any wakeup
+  // (wakeup runs with ptable.lock locked),
+  // so it's okay to release lk.
+  if(lk != &ptable.lock){  //DOC: sleeplock0
+    acquire(&ptable.lock);  //DOC: sleeplock1
+    release(lk);
+  }
+  // Go to sleep.
+  p->chan = chan;
+  p->state = SLEEPING;
+
+  sched();
+
+  // Tidy up.
+  p->chan = 0;
+
+  // Reacquire original lock.
+  if(lk != &ptable.lock){  //DOC: sleeplock2
+    release(&ptable.lock);
+    acquire(lk);
+  }
+}
+
+//PAGEBREAK!
+// Wake up all processes sleeping on chan.
+// The ptable lock must be held.
+static void
+wakeup1(void *chan)
+{
+  struct proc *p;
+
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++)
+    if(p->state == SLEEPING && p->chan == chan)
+      p->state = RUNNABLE;
+}
+
+// Wake up all processes sleeping on chan.
+void
+wakeup(void *chan)
+{
+  acquire(&ptable.lock);
+  wakeup1(chan);
+  release(&ptable.lock);
+}
+
+// Kill the process with the given pid.
+// Process won't exit until it returns
+// to user space (see trap in trap.c).
+int
+kill(int pid)
+{
+  struct proc *p;
+
+  acquire(&ptable.lock);
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+    if(p->pid == pid){
+      p->killed = 1;
+      // Wake process from sleep if necessary.
+      if(p->state == SLEEPING)
+        p->state = RUNNABLE;
+      release(&ptable.lock);
+      return 0;
+    }
+  }
+  release(&ptable.lock);
+  return -1;
+}
+
+//PAGEBREAK: 36
+// Print a process listing to console.  For debugging.
+// Runs when user types ^P on console.
+// No lock to avoid wedging a stuck machine further.
+void
+procdump(void)
+{
+  static char *states[] = {
+  [UNUSED]    "unused",
+  [EMBRYO]    "embryo",
+  [SLEEPING]  "sleep ",
+  [RUNNABLE]  "runble",
+  [RUNNING]   "run   ",
+  [ZOMBIE]    "zombie"
+  };
+  int i;
+  struct proc *p;
+  char *state;
+  uint pc[10];
+
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+    if(p->state == UNUSED)
+      continue;
+    if(p->state >= 0 && p->state < NELEM(states) && states[p->state])
+      state = states[p->state];
+    else
+      state = "???";
+    cprintf("%d %s %s", p->pid, state, p->name);
+    if(p->state == SLEEPING){
+      getcallerpcs((uint*)p->context->ebp+2, pc);
+      for(i=0; i<10 && pc[i] != 0; i++)
+        cprintf(" %p", pc[i]);
+    }
+    cprintf("\n");
+  }
+}
diff --git a/xv6-public/proc.h b/xv6-public/proc.h
new file mode 100644
index 0000000..5dc6b52
--- /dev/null
+++ b/xv6-public/proc.h
@@ -0,0 +1,61 @@
+// Per-CPU state
+struct cpu {
+  uchar apicid;                // Local APIC ID
+  struct context *scheduler;   // swtch() here to enter scheduler
+  struct taskstate ts;         // Used by x86 to find stack for interrupt
+  struct segdesc gdt[NSEGS];   // x86 global descriptor table
+  volatile uint started;       // Has the CPU started?
+  int ncli;                    // Depth of pushcli nesting.
+  int intena;                  // Were interrupts enabled before pushcli?
+  struct proc *proc;           // The process running on this cpu or null
+};
+
+extern struct cpu cpus[NCPU];
+extern int ncpu;
+
+//PAGEBREAK: 17
+// Saved registers for kernel context switches.
+// Don't need to save all the segment registers (%cs, etc),
+// because they are constant across kernel contexts.
+// Don't need to save %eax, %ecx, %edx, because the
+// x86 convention is that the caller has saved them.
+// Contexts are stored at the bottom of the stack they
+// describe; the stack pointer is the address of the context.
+// The layout of the context matches the layout of the stack in swtch.S
+// at the "Switch stacks" comment. Switch doesn't save eip explicitly,
+// but it is on the stack and allocproc() manipulates it.
+struct context {
+  uint edi;
+  uint esi;
+  uint ebx;
+  uint ebp;
+  uint eip;
+};
+
+enum procstate { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };
+
+// Per-process state
+struct proc {
+  uint sz;                     // Size of process memory (bytes)
+  pde_t* pgdir;                // Page table
+  char *kstack;                // Bottom of kernel stack for this process
+  enum procstate state;        // Process state
+  int pid;                     // Process ID
+  struct proc *parent;         // Parent process
+  struct trapframe *tf;        // Trap frame for current syscall
+  struct context *context;     // swtch() here to run process
+  void *chan;                  // If non-zero, sleeping on chan
+  int killed;                  // If non-zero, have been killed
+  struct file *ofile[NOFILE];  // Open files
+  struct inode *cwd;           // Current directory
+  char name[16];               // Process name (debugging)
+  int alarminterval;              
+  void (*alarmhandler)();           // pointer of handler
+  int ticks;
+};
+
+// Process memory is laid out contiguously, low addresses first:
+//   text
+//   original data and bss
+//   fixed-size stack
+//   expandable heap
diff --git a/xv6-public/rm.c b/xv6-public/rm.c
new file mode 100644
index 0000000..4fd33c8
--- /dev/null
+++ b/xv6-public/rm.c
@@ -0,0 +1,23 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int
+main(int argc, char *argv[])
+{
+  int i;
+
+  if(argc < 2){
+    printf(2, "Usage: rm files...\n");
+    exit();
+  }
+
+  for(i = 1; i < argc; i++){
+    if(unlink(argv[i]) < 0){
+      printf(2, "rm: %s failed to delete\n", argv[i]);
+      break;
+    }
+  }
+
+  exit();
+}
diff --git a/xv6-public/runoff b/xv6-public/runoff
new file mode 100644
index 0000000..be362d0
--- /dev/null
+++ b/xv6-public/runoff
@@ -0,0 +1,246 @@
+#!/bin/sh
+
+echo This script takes a minute to run.  Be patient. 1>&2
+
+LC_CTYPE=C export LC_CTYPE
+
+# pad stdin to multiple of 120 lines
+pad()
+{
+	awk '{print} END{for(; NR%120!=0; NR++) print ""}'
+}
+
+# create formatted (numbered) files
+mkdir -p fmt
+rm -f fmt/*
+cp README fmt
+echo > fmt/blank
+files=`grep -v '^#' runoff.list | awk '{print $1}'`
+n=99
+for i in $files
+do
+	./runoff1 -n $n $i >fmt/$i
+	nn=`tail -1 fmt/$i | sed 's/ .*//; s/^0*//'`
+	if [ "x$nn" != x ]; then
+		n=$nn
+	fi
+done
+
+# create table of contents
+cat toc.hdr >fmt/toc
+pr -e8 -t runoff.list | awk '
+/^[a-z0-9]/ {
+	s=$0
+	f="fmt/"$1
+	getline<f
+	close(f)
+	n=$1
+	printf("%02d %s\n", n/100, s);
+	printf("TOC: %04d %s\n", n, s) >"fmt/tocdata"
+	next
+}
+{
+	print
+}' | pr -3 -t >>fmt/toc
+cat toc.ftr >>fmt/toc
+
+# check for bad alignments
+perl -e '
+	$leftwarn = 0;
+	while(<>){
+		chomp;
+		s!#.*!!;
+		s!\s+! !g;
+		s! +$!!;
+		next if /^$/;
+		
+		if(/TOC: (\d+) (.*)/){
+			$toc{$2} = $1;
+			next;
+		}
+		
+		if(/sheet1: (left|right)$/){
+			print STDERR "assuming that sheet 1 is a $1 page.  double-check!\n";
+			$left = $1 eq "left" ? "13579" : "02468";
+			$right = $1 eq "left" ? "02468" : "13579";
+			next;
+		}
+		
+		if(/even: (.*)/){
+			$file = $1;
+			if(!defined($toc{$file})){
+				print STDERR "Have no toc for $file\n";
+				next;
+			}
+			if($toc{$file} =~ /^\d\d[^0]/){
+				print STDERR "$file does not start on a fresh page.\n";
+			}
+			next;
+		}
+		
+		if(/odd: (.*)/){
+			$file = $1;
+			if(!defined($toc{$file})){
+				print STDERR "Have no toc for $file\n";
+				next;
+			}
+			if($toc{$file} !~ /^\d\d5/){
+				print STDERR "$file does not start on a second half page.\n";
+			}
+			next;
+		}
+		
+		if(/(left|right): (.*)/){
+			$what = $1;
+			$file = $2;
+			if(!defined($toc{$file})){
+				print STDERR "Have no toc for $file\n";
+				next;
+			}
+			if($what eq "left" && !($toc{$file} =~ /^\d[$left][05]/)){
+				print STDERR "$file does not start on a left page [$toc{$file}]\n";
+			}
+			# why does this not work if I inline $x in the if?
+			$x = ($toc{$file} =~ /^\d[$right][05]/);
+			if($what eq "right" && !$x){
+				print STDERR "$file does not start on a right page [$toc{$file}] [$x]\n";
+			}
+			next;
+		}
+		
+		print STDERR "Unknown spec: $_\n";
+	}
+' fmt/tocdata runoff.spec
+
+# make definition list
+cd fmt
+perl -e '
+	while(<>) {
+		chomp;
+
+		s!//.*!!;
+		s!/\*([^*]|[*][^/])*\*/!!g;
+		s!\s! !g;
+		s! +$!!;
+
+		# look for declarations like char* x;
+		if (/^[0-9]+ typedef .* u(int|short|long|char);/) {
+			next;
+		}
+		if (/^[0-9]+ extern/) {
+			next;
+		}
+		if (/^[0-9]+ struct [a-zA-Z0-9_]+;/) {
+			next;
+		}
+		if (/^([0-9]+) #define +([A-za-z0-9_]+) +?\(.*/) {
+			print "$1 $2\n"
+		}
+		elsif (/^([0-9]+) #define +([A-Za-z0-9_]+) +([^ ]+)/) {
+			print "$1 $2 $3\n";
+		}
+		elsif (/^([0-9]+) #define +([A-Za-z0-9_]+)/) {
+			print "$1 $2\n";
+		}
+		
+		if(/^^([0-9]+) \.globl ([a-zA-Z0-9_]+)/){
+			$isglobl{$2} = 1;
+		}
+		if(/^^([0-9]+) ([a-zA-Z0-9_]+):$/ && $isglobl{$2}){
+			print "$1 $2\n";
+		}
+		
+		if (/\(/) {
+			next;
+		}
+
+		if (/^([0-9]+) (((static|struct|extern|union|enum) +)*([A-Za-z0-9_]+))( .*)? +([A-Za-z_][A-Za-z0-9_]*)(,|;|=| =)/) {
+			print "$1 $7\n";
+		}
+		
+		elsif(/^([0-9]+) (enum|struct|union) +([A-Za-z0-9_]+) +{/){ 
+			print "$1 $3\n";
+		}
+		# TODO: enum members
+	}
+' $files >defs
+
+(for i in $files
+do
+	case "$i" in
+	*.S)
+		cat $i | sed 's;#.*;;; s;//.*;;;'
+		;;
+	*)
+		cat $i | sed 's;//.*;;; s;"([^"\\]|\\.)*";;;'
+	esac
+done
+) >alltext
+
+perl -n -e 'print if s/^([0-9]+ [a-zA-Z0-9_]+)\(.*$/\1/;' alltext |
+	egrep -v ' (STUB|usage|main|if|for)$' >>defs
+#perl -n -e 'print if s/^([0-9]+) STUB\(([a-zA-Z0-9_]+)\)$/\1 \2/;' alltext \
+#	>>defs
+(
+>s.defs
+
+# make reference list
+for i in `awk '{print $2}' defs | sort -f | uniq`
+do
+	defs=`egrep '^[0-9]+ '$i'( |$)' defs | awk '{print $1}'`
+	echo $i $defs >>s.defs
+	uses=`egrep -h '([^a-zA-Z_0-9])'$i'($|[^a-zA-Z_0-9])' alltext | awk '{print $1}'`
+	if [ "x$defs" != "x$uses" ]; then
+		echo $i $defs
+		echo $uses |fmt -29 | sed 's/^/    /'
+#	else
+#		echo $i defined but not used >&2
+	fi
+done
+) >refs
+
+# build defs list
+awk '
+{
+	printf("%04d %s\n", $2, $1);
+	for(i=3; i<=NF; i++)
+		printf("%04d    \" \n", $i);
+}
+' s.defs > t.defs
+
+# format the whole thing
+(
+	../pr.pl README
+	../pr.pl -h "table of contents" toc
+	# pr -t -2 t.defs | ../pr.pl -h "definitions" | pad
+	pr -t -l50 -2 refs | ../pr.pl -h "cross-references" | pad
+	# pr.pl -h "definitions" -2 t.defs | pad
+	# pr.pl -h "cross-references" -2 refs | pad
+	../pr.pl blank  # make sheet 1 start on left page
+	../pr.pl blank
+	for i in $files
+	do
+		../pr.pl -h "xv6/$i" $i
+	done
+) | mpage -m50t50b -o -bLetter -T -t -2 -FCourier -L60 >all.ps
+grep Pages: all.ps
+
+# if we have the nice font, use it
+nicefont=LucidaSans-Typewriter83
+if [ ! -f ../$nicefont ]
+then
+	if git cat-file blob font:$nicefont > ../$nicefont~; then
+		mv ../$nicefont~ ../$nicefont
+	fi
+fi
+if [ -f ../$nicefont ]
+then
+	echo nicefont
+	(sed 1q all.ps; cat ../$nicefont; sed "1d; s/Courier/$nicefont/" all.ps) >allf.ps
+else
+	echo ugly font!
+	cp all.ps allf.ps
+fi
+ps2pdf allf.ps ../xv6.pdf
+# cd ..
+# pdftops xv6.pdf xv6.ps
diff --git a/xv6-public/runoff.list b/xv6-public/runoff.list
new file mode 100644
index 0000000..2df9b81
--- /dev/null
+++ b/xv6-public/runoff.list
@@ -0,0 +1,80 @@
+# basic headers
+types.h
+param.h
+memlayout.h
+defs.h
+x86.h
+asm.h
+mmu.h
+elf.h
+date.h
+
+# entering xv6
+entry.S
+entryother.S
+main.c
+
+# locks
+spinlock.h
+spinlock.c
+
+# processes
+vm.c
+proc.h
+proc.c
+swtch.S
+kalloc.c
+
+# system calls
+traps.h
+vectors.pl
+trapasm.S
+trap.c
+syscall.h
+syscall.c
+sysproc.c
+
+# file system
+buf.h
+sleeplock.h
+fcntl.h
+stat.h
+fs.h
+file.h
+ide.c
+bio.c
+sleeplock.c
+log.c
+fs.c
+file.c
+sysfile.c
+exec.c
+
+# pipes
+pipe.c
+
+# string operations
+string.c
+
+# low-level hardware
+mp.h
+mp.c
+lapic.c
+ioapic.c
+kbd.h
+kbd.c
+console.c
+uart.c
+
+# user-level
+initcode.S
+usys.S
+init.c
+sh.c
+
+# bootloader
+bootasm.S
+bootmain.c
+
+# link
+kernel.ld
diff --git a/xv6-public/runoff.spec b/xv6-public/runoff.spec
new file mode 100644
index 0000000..9247948
--- /dev/null
+++ b/xv6-public/runoff.spec
@@ -0,0 +1,102 @@
+# Is sheet 01 (after the TOC) a left sheet or a right sheet?
+sheet1: left
+
+# "left" and "right" specify which page of a two-page spread a file
+# must start on.  "left" means that a file must start on the first of
+# the two pages.  "right" means it must start on the second of the two
+# pages.  The file may start in either column.
+#
+# "even" and "odd" specify which column a file must start on.  "even"
+# means it must start in the left of the two columns (00).  "odd" means it
+# must start in the right of the two columns (50).
+#
+# You'd think these would be the other way around.
+
+# types.h either
+# param.h either
+# defs.h either
+# x86.h either
+# asm.h either
+# mmu.h either
+# elf.h either
+# mp.h either
+
+even: entry.S  # mild preference
+even: entryother.S  # mild preference
+even: main.c
+# mp.c don't care at all
+# even: initcode.S
+# odd: init.c
+
+left: spinlock.h
+even: spinlock.h
+
+# This gets struct proc and allocproc on the same spread
+left: proc.h
+even: proc.h
+
+# goal is to have two action-packed 2-page spreads,
+# one with
+#     userinit growproc fork exit wait
+# and another with
+#     scheduler sched yield forkret sleep wakeup1 wakeup
+right: proc.c   # VERY important
+even: proc.c   # VERY important
+
+# A few more action packed spreads
+# page table creation and process loading
+#     walkpgdir mappages setupkvm switch[ku]vm inituvm (loaduvm)
+# process memory management
+#     allocuvm deallocuvm freevm
+left: vm.c
+
+even: kalloc.c  # mild preference
+
+# syscall.h either
+# trapasm.S either
+# traps.h either
+# even: trap.c
+# vectors.pl either
+# syscall.c either
+# sysproc.c either
+
+# buf.h either
+# dev.h either
+# fcntl.h either
+# stat.h either
+# file.h either
+# fs.h either
+# fsvar.h either
+# left: ide.c # mild preference
+even: ide.c
+# odd: bio.c
+
+# log.c fits nicely in a spread
+even: log.c
+left: log.c
+
+# with fs.c starting on 2nd column of a left page, we get these 2-page spreads:
+#	ialloc iupdate iget idup ilock iunlock iput iunlockput
+#	bmap itrunc stati readi writei
+#	namecmp dirlookup dirlink skipelem namex namei
+#	fileinit filealloc filedup fileclose filestat fileread filewrite
+# starting on 2nd column of a right page is not terrible either
+odd: fs.c   # VERY important
+left: fs.c  # mild preference
+# file.c either
+# exec.c either
+# sysfile.c either
+
+# Mild preference, but makes spreads of mp.c, lapic.c, and ioapic.c+picirq.c
+even: mp.c
+left: mp.c
+
+# even: pipe.c  # mild preference
+# string.c either
+# left: kbd.h  # mild preference
+even: kbd.h
+even: console.c
+odd: sh.c
+
+even: bootasm.S   # mild preference
+even: bootmain.c  # mild preference
diff --git a/xv6-public/runoff1 b/xv6-public/runoff1
new file mode 100644
index 0000000..532f844
--- /dev/null
+++ b/xv6-public/runoff1
@@ -0,0 +1,108 @@
+#!/usr/bin/perl
+
+$n = 0;
+$v = 0;
+if($ARGV[0] eq "-v") {
+	$v = 1;
+	shift @ARGV;
+}
+if($ARGV[0] eq "-n") {
+	$n = $ARGV[1];
+	shift @ARGV;
+	shift @ARGV;
+}
+$n = int(($n+49)/50)*50 - 1;
+
+$file = $ARGV[0];
+@lines = <>;
+$linenum = 0;
+foreach (@lines) {
+	$linenum++;
+	chomp;
+	s/\s+$//;
+	if(length() >= 75){
+		print STDERR "$file:$linenum: line too long\n";
+	}
+}
+@outlines = ();
+$nextout = 0;
+
+for($i=0; $i<@lines; ){
+	# Skip leading blank lines.
+	$i++ while $i<@lines && $lines[$i] =~ /^$/;
+	last if $i>=@lines;
+
+	# If the rest of the file fits, use the whole thing.
+	if(@lines <= $i+50 && !grep { /PAGEBREAK/ } @lines){
+		$breakbefore = @lines;
+	}else{
+		# Find a good next page break;
+		# Hope for end of function.
+		# but settle for a blank line (but not first blank line
+		# in function, which comes after variable declarations).
+		$breakbefore = $i;
+		$lastblank = $i;
+		$sawbrace = 0;
+		$breaksize = 15;  # 15 lines to get to function
+		for($j=$i; $j<$i+50 && $j < @lines; $j++){
+			if($lines[$j] =~ /PAGEBREAK!/){
+				$lines[$j] = "";
+				$breakbefore = $j;
+				$breaksize = 100;
+				last;
+			}
+			if($lines[$j] =~ /PAGEBREAK:\s*([0-9]+)/){
+				$breaksize = $1;
+				$breakbefore = $j;
+				$lines[$j] = "";
+			}
+			if($lines[$j] =~ /^};?$/){
+				$breakbefore = $j+1;
+				$breaksize = 15;
+			}
+			if($lines[$j] =~ /^{$/){
+				$sawbrace = 1;
+			}
+			if($lines[$j] =~ /^$/){
+				if($sawbrace){
+					$sawbrace = 0;
+				}else{
+					$lastblank = $j;
+				}
+			}
+		}
+		if($j<@lines && $lines[$j] =~ /^$/){
+			$lastblank = $j;
+		}
+
+		# If we are not putting enough on a page, try a blank line.
+		if($breakbefore - $i < 50 - $breaksize && $lastblank > $breakbefore && $lastblank >= $i+50 - 5){
+			if($v){
+				print STDERR "breakbefore $breakbefore i $i breaksize $breaksize\n";
+			}
+			$breakbefore = $lastblank;
+			$breaksize = 5;  # only 5 lines to get to blank line
+		}
+
+		# If we are not putting enough on a page, force a full page.
+		if($breakbefore - $i < 50 - $breaksize && $breakbefore != @lines){
+			$breakbefore = $i + 50;
+			$breakbefore = @lines if @lines < $breakbefore;
+		}
+
+		if($breakbefore < $i+2){
+			$breakbefore = $i+2;
+		}
+	}
+
+	# Emit the page.
+	$i50 = $i + 50;
+	for(; $i<$breakbefore; $i++){
+		printf "%04d %s\n", ++$n, $lines[$i];
+	}
+
+	# Finish page
+	for($j=$i; $j<$i50; $j++){
+		printf "%04d \n", ++$n;
+	}
+}
diff --git a/xv6-public/sh.c b/xv6-public/sh.c
new file mode 100644
index 0000000..054bab9
--- /dev/null
+++ b/xv6-public/sh.c
@@ -0,0 +1,493 @@
+// Shell.
+
+#include "types.h"
+#include "user.h"
+#include "fcntl.h"
+
+// Parsed command representation
+#define EXEC  1
+#define REDIR 2
+#define PIPE  3
+#define LIST  4
+#define BACK  5
+
+#define MAXARGS 10
+
+struct cmd {
+  int type;
+};
+
+struct execcmd {
+  int type;
+  char *argv[MAXARGS];
+  char *eargv[MAXARGS];
+};
+
+struct redircmd {
+  int type;
+  struct cmd *cmd;
+  char *file;
+  char *efile;
+  int mode;
+  int fd;
+};
+
+struct pipecmd {
+  int type;
+  struct cmd *left;
+  struct cmd *right;
+};
+
+struct listcmd {
+  int type;
+  struct cmd *left;
+  struct cmd *right;
+};
+
+struct backcmd {
+  int type;
+  struct cmd *cmd;
+};
+
+int fork1(void);  // Fork but panics on failure.
+void panic(char*);
+struct cmd *parsecmd(char*);
+
+// Execute cmd.  Never returns.
+void
+runcmd(struct cmd *cmd)
+{
+  int p[2];
+  struct backcmd *bcmd;
+  struct execcmd *ecmd;
+  struct listcmd *lcmd;
+  struct pipecmd *pcmd;
+  struct redircmd *rcmd;
+
+  if(cmd == 0)
+    exit();
+
+  switch(cmd->type){
+  default:
+    panic("runcmd");
+
+  case EXEC:
+    ecmd = (struct execcmd*)cmd;
+    if(ecmd->argv[0] == 0)
+      exit();
+    exec(ecmd->argv[0], ecmd->argv);
+    printf(2, "exec %s failed\n", ecmd->argv[0]);
+    break;
+
+  case REDIR:
+    rcmd = (struct redircmd*)cmd;
+    close(rcmd->fd);
+    if(open(rcmd->file, rcmd->mode) < 0){
+      printf(2, "open %s failed\n", rcmd->file);
+      exit();
+    }
+    runcmd(rcmd->cmd);
+    break;
+
+  case LIST:
+    lcmd = (struct listcmd*)cmd;
+    if(fork1() == 0)
+      runcmd(lcmd->left);
+    wait();
+    runcmd(lcmd->right);
+    break;
+
+  case PIPE:
+    pcmd = (struct pipecmd*)cmd;
+    if(pipe(p) < 0)
+      panic("pipe");
+    if(fork1() == 0){
+      close(1);
+      dup(p[1]);
+      close(p[0]);
+      close(p[1]);
+      runcmd(pcmd->left);
+    }
+    if(fork1() == 0){
+      close(0);
+      dup(p[0]);
+      close(p[0]);
+      close(p[1]);
+      runcmd(pcmd->right);
+    }
+    close(p[0]);
+    close(p[1]);
+    wait();
+    wait();
+    break;
+
+  case BACK:
+    bcmd = (struct backcmd*)cmd;
+    if(fork1() == 0)
+      runcmd(bcmd->cmd);
+    break;
+  }
+  exit();
+}
+
+int
+getcmd(char *buf, int nbuf)
+{
+  printf(2, "$ ");
+  memset(buf, 0, nbuf);
+  gets(buf, nbuf);
+  if(buf[0] == 0) // EOF
+    return -1;
+  return 0;
+}
+
+int
+main(void)
+{
+  static char buf[100];
+  int fd;
+
+  // Ensure that three file descriptors are open.
+  while((fd = open("console", O_RDWR)) >= 0){
+    if(fd >= 3){
+      close(fd);
+      break;
+    }
+  }
+
+  // Read and run input commands.
+  while(getcmd(buf, sizeof(buf)) >= 0){
+    if(buf[0] == 'c' && buf[1] == 'd' && buf[2] == ' '){
+      // Chdir must be called by the parent, not the child.
+      buf[strlen(buf)-1] = 0;  // chop \n
+      if(chdir(buf+3) < 0)
+        printf(2, "cannot cd %s\n", buf+3);
+      continue;
+    }
+    if(fork1() == 0)
+      runcmd(parsecmd(buf));
+    wait();
+  }
+  exit();
+}
+
+void
+panic(char *s)
+{
+  printf(2, "%s\n", s);
+  exit();
+}
+
+int
+fork1(void)
+{
+  int pid;
+
+  pid = fork();
+  if(pid == -1)
+    panic("fork");
+  return pid;
+}
+
+//PAGEBREAK!
+// Constructors
+
+struct cmd*
+execcmd(void)
+{
+  struct execcmd *cmd;
+
+  cmd = malloc(sizeof(*cmd));
+  memset(cmd, 0, sizeof(*cmd));
+  cmd->type = EXEC;
+  return (struct cmd*)cmd;
+}
+
+struct cmd*
+redircmd(struct cmd *subcmd, char *file, char *efile, int mode, int fd)
+{
+  struct redircmd *cmd;
+
+  cmd = malloc(sizeof(*cmd));
+  memset(cmd, 0, sizeof(*cmd));
+  cmd->type = REDIR;
+  cmd->cmd = subcmd;
+  cmd->file = file;
+  cmd->efile = efile;
+  cmd->mode = mode;
+  cmd->fd = fd;
+  return (struct cmd*)cmd;
+}
+
+struct cmd*
+pipecmd(struct cmd *left, struct cmd *right)
+{
+  struct pipecmd *cmd;
+
+  cmd = malloc(sizeof(*cmd));
+  memset(cmd, 0, sizeof(*cmd));
+  cmd->type = PIPE;
+  cmd->left = left;
+  cmd->right = right;
+  return (struct cmd*)cmd;
+}
+
+struct cmd*
+listcmd(struct cmd *left, struct cmd *right)
+{
+  struct listcmd *cmd;
+
+  cmd = malloc(sizeof(*cmd));
+  memset(cmd, 0, sizeof(*cmd));
+  cmd->type = LIST;
+  cmd->left = left;
+  cmd->right = right;
+  return (struct cmd*)cmd;
+}
+
+struct cmd*
+backcmd(struct cmd *subcmd)
+{
+  struct backcmd *cmd;
+
+  cmd = malloc(sizeof(*cmd));
+  memset(cmd, 0, sizeof(*cmd));
+  cmd->type = BACK;
+  cmd->cmd = subcmd;
+  return (struct cmd*)cmd;
+}
+//PAGEBREAK!
+// Parsing
+
+char whitespace[] = " \t\r\n\v";
+char symbols[] = "<|>&;()";
+
+int
+gettoken(char **ps, char *es, char **q, char **eq)
+{
+  char *s;
+  int ret;
+
+  s = *ps;
+  while(s < es && strchr(whitespace, *s))
+    s++;
+  if(q)
+    *q = s;
+  ret = *s;
+  switch(*s){
+  case 0:
+    break;
+  case '|':
+  case '(':
+  case ')':
+  case ';':
+  case '&':
+  case '<':
+    s++;
+    break;
+  case '>':
+    s++;
+    if(*s == '>'){
+      ret = '+';
+      s++;
+    }
+    break;
+  default:
+    ret = 'a';
+    while(s < es && !strchr(whitespace, *s) && !strchr(symbols, *s))
+      s++;
+    break;
+  }
+  if(eq)
+    *eq = s;
+
+  while(s < es && strchr(whitespace, *s))
+    s++;
+  *ps = s;
+  return ret;
+}
+
+int
+peek(char **ps, char *es, char *toks)
+{
+  char *s;
+
+  s = *ps;
+  while(s < es && strchr(whitespace, *s))
+    s++;
+  *ps = s;
+  return *s && strchr(toks, *s);
+}
+
+struct cmd *parseline(char**, char*);
+struct cmd *parsepipe(char**, char*);
+struct cmd *parseexec(char**, char*);
+struct cmd *nulterminate(struct cmd*);
+
+struct cmd*
+parsecmd(char *s)
+{
+  char *es;
+  struct cmd *cmd;
+
+  es = s + strlen(s);
+  cmd = parseline(&s, es);
+  peek(&s, es, "");
+  if(s != es){
+    printf(2, "leftovers: %s\n", s);
+    panic("syntax");
+  }
+  nulterminate(cmd);
+  return cmd;
+}
+
+struct cmd*
+parseline(char **ps, char *es)
+{
+  struct cmd *cmd;
+
+  cmd = parsepipe(ps, es);
+  while(peek(ps, es, "&")){
+    gettoken(ps, es, 0, 0);
+    cmd = backcmd(cmd);
+  }
+  if(peek(ps, es, ";")){
+    gettoken(ps, es, 0, 0);
+    cmd = listcmd(cmd, parseline(ps, es));
+  }
+  return cmd;
+}
+
+struct cmd*
+parsepipe(char **ps, char *es)
+{
+  struct cmd *cmd;
+
+  cmd = parseexec(ps, es);
+  if(peek(ps, es, "|")){
+    gettoken(ps, es, 0, 0);
+    cmd = pipecmd(cmd, parsepipe(ps, es));
+  }
+  return cmd;
+}
+
+struct cmd*
+parseredirs(struct cmd *cmd, char **ps, char *es)
+{
+  int tok;
+  char *q, *eq;
+
+  while(peek(ps, es, "<>")){
+    tok = gettoken(ps, es, 0, 0);
+    if(gettoken(ps, es, &q, &eq) != 'a')
+      panic("missing file for redirection");
+    switch(tok){
+    case '<':
+      cmd = redircmd(cmd, q, eq, O_RDONLY, 0);
+      break;
+    case '>':
+      cmd = redircmd(cmd, q, eq, O_WRONLY|O_CREATE, 1);
+      break;
+    case '+':  // >>
+      cmd = redircmd(cmd, q, eq, O_WRONLY|O_CREATE, 1);
+      break;
+    }
+  }
+  return cmd;
+}
+
+struct cmd*
+parseblock(char **ps, char *es)
+{
+  struct cmd *cmd;
+
+  if(!peek(ps, es, "("))
+    panic("parseblock");
+  gettoken(ps, es, 0, 0);
+  cmd = parseline(ps, es);
+  if(!peek(ps, es, ")"))
+    panic("syntax - missing )");
+  gettoken(ps, es, 0, 0);
+  cmd = parseredirs(cmd, ps, es);
+  return cmd;
+}
+
+struct cmd*
+parseexec(char **ps, char *es)
+{
+  char *q, *eq;
+  int tok, argc;
+  struct execcmd *cmd;
+  struct cmd *ret;
+
+  if(peek(ps, es, "("))
+    return parseblock(ps, es);
+
+  ret = execcmd();
+  cmd = (struct execcmd*)ret;
+
+  argc = 0;
+  ret = parseredirs(ret, ps, es);
+  while(!peek(ps, es, "|)&;")){
+    if((tok=gettoken(ps, es, &q, &eq)) == 0)
+      break;
+    if(tok != 'a')
+      panic("syntax");
+    cmd->argv[argc] = q;
+    cmd->eargv[argc] = eq;
+    argc++;
+    if(argc >= MAXARGS)
+      panic("too many args");
+    ret = parseredirs(ret, ps, es);
+  }
+  cmd->argv[argc] = 0;
+  cmd->eargv[argc] = 0;
+  return ret;
+}
+
+// NUL-terminate all the counted strings.
+struct cmd*
+nulterminate(struct cmd *cmd)
+{
+  int i;
+  struct backcmd *bcmd;
+  struct execcmd *ecmd;
+  struct listcmd *lcmd;
+  struct pipecmd *pcmd;
+  struct redircmd *rcmd;
+
+  if(cmd == 0)
+    return 0;
+
+  switch(cmd->type){
+  case EXEC:
+    ecmd = (struct execcmd*)cmd;
+    for(i=0; ecmd->argv[i]; i++)
+      *ecmd->eargv[i] = 0;
+    break;
+
+  case REDIR:
+    rcmd = (struct redircmd*)cmd;
+    nulterminate(rcmd->cmd);
+    *rcmd->efile = 0;
+    break;
+
+  case PIPE:
+    pcmd = (struct pipecmd*)cmd;
+    nulterminate(pcmd->left);
+    nulterminate(pcmd->right);
+    break;
+
+  case LIST:
+    lcmd = (struct listcmd*)cmd;
+    nulterminate(lcmd->left);
+    nulterminate(lcmd->right);
+    break;
+
+  case BACK:
+    bcmd = (struct backcmd*)cmd;
+    nulterminate(bcmd->cmd);
+    break;
+  }
+  return cmd;
+}
diff --git a/xv6-public/show1 b/xv6-public/show1
new file mode 100644
index 0000000..e0d3d83
--- /dev/null
+++ b/xv6-public/show1
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+runoff1 "$@" | pr.pl -h "xv6/$@" | mpage -m50t50b -o -bLetter -T -t -2 -FLucidaSans-Typewriter83 -L60 >x.ps; gv --swap x.ps
diff --git a/xv6-public/sign.pl b/xv6-public/sign.pl
new file mode 100644
index 0000000..d793035
--- /dev/null
+++ b/xv6-public/sign.pl
@@ -0,0 +1,19 @@
+#!/usr/bin/perl
+
+open(SIG, $ARGV[0]) || die "open $ARGV[0]: $!";
+
+$n = sysread(SIG, $buf, 1000);
+
+if($n > 510){
+  print STDERR "boot block too large: $n bytes (max 510)\n";
+  exit 1;
+}
+
+print STDERR "boot block is $n bytes (max 510)\n";
+
+$buf .= "\0" x (510-$n);
+$buf .= "\x55\xAA";
+
+open(SIG, ">$ARGV[0]") || die "open >$ARGV[0]: $!";
+print SIG $buf;
+close SIG;
diff --git a/xv6-public/sleep1.p b/xv6-public/sleep1.p
new file mode 100644
index 0000000..af69772
--- /dev/null
+++ b/xv6-public/sleep1.p
@@ -0,0 +1,134 @@
+/*
+This file defines a Promela model for xv6's
+acquire, release, sleep, and wakeup, along with
+a model of a simple producer/consumer queue.
+
+To run:
+	spinp sleep1.p
+
+(You may need to install Spin, available at http://spinroot.com/.)
+
+After a successful run spin prints something like:
+
+	unreached in proctype consumer
+		(0 of 37 states)
+	unreached in proctype producer
+		(0 of 23 states)
+
+After an unsuccessful run, the spinp script prints
+an execution trace that causes a deadlock.
+
+The safe body of producer reads:
+
+		acquire(lk);
+		x = value; value = x + 1; x = 0;
+		wakeup(0);
+		release(lk);
+		i = i + 1;
+
+If this is changed to:
+
+		x = value; value = x + 1; x = 0;
+		acquire(lk);
+		wakeup(0);
+		release(lk);
+		i = i + 1;
+
+then a deadlock can happen, because the non-atomic
+increment of value conflicts with the non-atomic 
+decrement in consumer, causing value to have a bad value.
+Try this.
+
+If it is changed to:
+
+		acquire(lk);
+		x = value; value = x + 1; x = 0;
+		release(lk);
+		wakeup(0);
+		i = i + 1;
+
+then nothing bad happens: it is okay to wakeup after release
+instead of before, although it seems morally wrong.
+*/
+
+#define ITER 4
+#define N 2
+
+bit lk;
+byte value;
+bit sleeping[N];
+
+inline acquire(x)
+{
+	atomic { x == 0; x = 1 }
+}
+
+inline release(x)
+{
+	assert x==1;
+	x = 0
+}
+
+inline sleep(cond, lk)
+{
+	assert !sleeping[_pid];
+	if
+	:: cond ->
+		skip
+	:: else ->
+		atomic { release(lk); sleeping[_pid] = 1 };
+		sleeping[_pid] == 0;
+		acquire(lk)
+	fi
+}
+
+inline wakeup()
+{
+	w = 0;
+	do
+	:: w < N ->
+		sleeping[w] = 0;
+		w = w + 1
+	:: else ->
+		break
+	od
+}
+
+active[N] proctype consumer()
+{
+	byte i, x;
+	
+	i = 0;
+	do
+	:: i < ITER ->
+		acquire(lk);
+		sleep(value > 0, lk);
+		x = value; value = x - 1; x = 0;
+		release(lk);
+		i = i + 1;
+	:: else ->
+		break
+	od;
+	i = 0;
+	skip
+}
+
+active[N] proctype producer()
+{
+	byte i, x, w;
+	
+	i = 0;
+	do
+	:: i < ITER ->
+		acquire(lk);
+		x = value; value = x + 1; x = 0;
+		release(lk);
+		wakeup();
+		i = i + 1;
+	:: else ->
+		break
+	od;
+	i = 0;
+	skip	
+}
+
diff --git a/xv6-public/sleeplock.c b/xv6-public/sleeplock.c
new file mode 100644
index 0000000..e0750ea
--- /dev/null
+++ b/xv6-public/sleeplock.c
@@ -0,0 +1,56 @@
+// Sleeping locks
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "x86.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+
+void
+initsleeplock(struct sleeplock *lk, char *name)
+{
+  initlock(&lk->lk, "sleep lock");
+  lk->name = name;
+  lk->locked = 0;
+  lk->pid = 0;
+}
+
+void
+acquiresleep(struct sleeplock *lk)
+{
+  acquire(&lk->lk);
+  while (lk->locked) {
+    sleep(lk, &lk->lk);
+  }
+  lk->locked = 1;
+  lk->pid = myproc()->pid;
+  release(&lk->lk);
+}
+
+void
+releasesleep(struct sleeplock *lk)
+{
+  acquire(&lk->lk);
+  lk->locked = 0;
+  lk->pid = 0;
+  wakeup(lk);
+  release(&lk->lk);
+}
+
+int
+holdingsleep(struct sleeplock *lk)
+{
+  int r;
+  
+  acquire(&lk->lk);
+  r = lk->locked && (lk->pid == myproc()->pid);
+  release(&lk->lk);
+  return r;
+}
+
+
+
diff --git a/xv6-public/sleeplock.h b/xv6-public/sleeplock.h
new file mode 100644
index 0000000..110e6f3
--- /dev/null
+++ b/xv6-public/sleeplock.h
@@ -0,0 +1,10 @@
+// Long-term locks for processes
+struct sleeplock {
+  uint locked;       // Is the lock held?
+  struct spinlock lk; // spinlock protecting this sleep lock
+  
+  // For debugging:
+  char *name;        // Name of lock.
+  int pid;           // Process holding lock
+};
+
diff --git a/xv6-public/spinlock.c b/xv6-public/spinlock.c
new file mode 100644
index 0000000..4020186
--- /dev/null
+++ b/xv6-public/spinlock.c
@@ -0,0 +1,126 @@
+// Mutual exclusion spin locks.
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "x86.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "spinlock.h"
+
+void
+initlock(struct spinlock *lk, char *name)
+{
+  lk->name = name;
+  lk->locked = 0;
+  lk->cpu = 0;
+}
+
+// Acquire the lock.
+// Loops (spins) until the lock is acquired.
+// Holding a lock for a long time may cause
+// other CPUs to waste time spinning to acquire it.
+void
+acquire(struct spinlock *lk)
+{
+  pushcli(); // disable interrupts to avoid deadlock.
+  if(holding(lk))
+    panic("acquire");
+
+  // The xchg is atomic.
+  while(xchg(&lk->locked, 1) != 0)
+    ;
+
+  // Tell the C compiler and the processor to not move loads or stores
+  // past this point, to ensure that the critical section's memory
+  // references happen after the lock is acquired.
+  __sync_synchronize();
+
+  // Record info about lock acquisition for debugging.
+  lk->cpu = mycpu();
+  getcallerpcs(&lk, lk->pcs);
+}
+
+// Release the lock.
+void
+release(struct spinlock *lk)
+{
+  if(!holding(lk))
+    panic("release");
+
+  lk->pcs[0] = 0;
+  lk->cpu = 0;
+
+  // Tell the C compiler and the processor to not move loads or stores
+  // past this point, to ensure that all the stores in the critical
+  // section are visible to other cores before the lock is released.
+  // Both the C compiler and the hardware may re-order loads and
+  // stores; __sync_synchronize() tells them both not to.
+  __sync_synchronize();
+
+  // Release the lock, equivalent to lk->locked = 0.
+  // This code can't use a C assignment, since it might
+  // not be atomic. A real OS would use C atomics here.
+  asm volatile("movl $0, %0" : "+m" (lk->locked) : );
+
+  popcli();
+}
+
+// Record the current call stack in pcs[] by following the %ebp chain.
+void
+getcallerpcs(void *v, uint pcs[])
+{
+  uint *ebp;
+  int i;
+
+  ebp = (uint*)v - 2;
+  for(i = 0; i < 10; i++){
+    if(ebp == 0 || ebp < (uint*)KERNBASE || ebp == (uint*)0xffffffff)
+      break;
+    pcs[i] = ebp[1];     // saved %eip
+    ebp = (uint*)ebp[0]; // saved %ebp
+  }
+  for(; i < 10; i++)
+    pcs[i] = 0;
+}
+
+// Check whether this cpu is holding the lock.
+int
+holding(struct spinlock *lock)
+{
+  int r;
+  pushcli();
+  r = lock->locked && lock->cpu == mycpu();
+  popcli();
+  return r;
+}
+
+
+// Pushcli/popcli are like cli/sti except that they are matched:
+// it takes two popcli to undo two pushcli.  Also, if interrupts
+// are off, then pushcli, popcli leaves them off.
+
+void
+pushcli(void)
+{
+  int eflags;
+
+  eflags = readeflags();
+  cli();
+  if(mycpu()->ncli == 0)
+    mycpu()->intena = eflags & FL_IF;
+  mycpu()->ncli += 1;
+}
+
+void
+popcli(void)
+{
+  if(readeflags()&FL_IF)
+    panic("popcli - interruptible");
+  if(--mycpu()->ncli < 0)
+    panic("popcli");
+  if(mycpu()->ncli == 0 && mycpu()->intena)
+    sti();
+}
+
diff --git a/xv6-public/spinlock.h b/xv6-public/spinlock.h
new file mode 100644
index 0000000..0a9d8e2
--- /dev/null
+++ b/xv6-public/spinlock.h
@@ -0,0 +1,11 @@
+// Mutual exclusion lock.
+struct spinlock {
+  uint locked;       // Is the lock held?
+
+  // For debugging:
+  char *name;        // Name of lock.
+  struct cpu *cpu;   // The cpu holding the lock.
+  uint pcs[10];      // The call stack (an array of program counters)
+                     // that locked the lock.
+};
+
diff --git a/xv6-public/spinp b/xv6-public/spinp
new file mode 100644
index 0000000..db9614b
--- /dev/null
+++ b/xv6-public/spinp
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+if [ $# != 1 ] || [ ! -f "$1" ]; then
+	echo 'usage: spinp file.p' 1>&2
+	exit 1
+fi
+
+rm -f $1.trail
+spin -a $1 || exit 1
+cc -DSAFETY -DREACH -DMEMLIM=500 -o pan pan.c
+pan -i
+rm pan.* pan
+if [ -f $1.trail ]; then
+	spin -t -p $1
+fi
+
diff --git a/xv6-public/stat.h b/xv6-public/stat.h
new file mode 100644
index 0000000..8a80933
--- /dev/null
+++ b/xv6-public/stat.h
@@ -0,0 +1,11 @@
+#define T_DIR  1   // Directory
+#define T_FILE 2   // File
+#define T_DEV  3   // Device
+
+struct stat {
+  short type;  // Type of file
+  int dev;     // File system's disk device
+  uint ino;    // Inode number
+  short nlink; // Number of links to file
+  uint size;   // Size of file in bytes
+};
diff --git a/xv6-public/stressfs.c b/xv6-public/stressfs.c
new file mode 100644
index 0000000..c0a4743
--- /dev/null
+++ b/xv6-public/stressfs.c
@@ -0,0 +1,49 @@
+// Demonstrate that moving the "acquire" in iderw after the loop that
+// appends to the idequeue results in a race.
+
+// For this to work, you should also add a spin within iderw's
+// idequeue traversal loop.  Adding the following demonstrated a panic
+// after about 5 runs of stressfs in QEMU on a 2.1GHz CPU:
+//    for (i = 0; i < 40000; i++)
+//      asm volatile("");
+
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+#include "fs.h"
+#include "fcntl.h"
+
+int
+main(int argc, char *argv[])
+{
+  int fd, i;
+  char path[] = "stressfs0";
+  char data[512];
+
+  printf(1, "stressfs starting\n");
+  memset(data, 'a', sizeof(data));
+
+  for(i = 0; i < 4; i++)
+    if(fork() > 0)
+      break;
+
+  printf(1, "write %d\n", i);
+
+  path[8] += i;
+  fd = open(path, O_CREATE | O_RDWR);
+  for(i = 0; i < 20; i++)
+//    printf(fd, "%d\n", i);
+    write(fd, data, sizeof(data));
+  close(fd);
+
+  printf(1, "read\n");
+
+  fd = open(path, O_RDONLY);
+  for (i = 0; i < 20; i++)
+    read(fd, data, sizeof(data));
+  close(fd);
+
+  wait();
+
+  exit();
+}
diff --git a/xv6-public/string.c b/xv6-public/string.c
new file mode 100644
index 0000000..a7cc61f
--- /dev/null
+++ b/xv6-public/string.c
@@ -0,0 +1,105 @@
+#include "types.h"
+#include "x86.h"
+
+void*
+memset(void *dst, int c, uint n)
+{
+  if ((int)dst%4 == 0 && n%4 == 0){
+    c &= 0xFF;
+    stosl(dst, (c<<24)|(c<<16)|(c<<8)|c, n/4);
+  } else
+    stosb(dst, c, n);
+  return dst;
+}
+
+int
+memcmp(const void *v1, const void *v2, uint n)
+{
+  const uchar *s1, *s2;
+
+  s1 = v1;
+  s2 = v2;
+  while(n-- > 0){
+    if(*s1 != *s2)
+      return *s1 - *s2;
+    s1++, s2++;
+  }
+
+  return 0;
+}
+
+void*
+memmove(void *dst, const void *src, uint n)
+{
+  const char *s;
+  char *d;
+
+  s = src;
+  d = dst;
+  if(s < d && s + n > d){
+    s += n;
+    d += n;
+    while(n-- > 0)
+      *--d = *--s;
+  } else
+    while(n-- > 0)
+      *d++ = *s++;
+
+  return dst;
+}
+
+// memcpy exists to placate GCC.  Use memmove.
+void*
+memcpy(void *dst, const void *src, uint n)
+{
+  return memmove(dst, src, n);
+}
+
+int
+strncmp(const char *p, const char *q, uint n)
+{
+  while(n > 0 && *p && *p == *q)
+    n--, p++, q++;
+  if(n == 0)
+    return 0;
+  return (uchar)*p - (uchar)*q;
+}
+
+char*
+strncpy(char *s, const char *t, int n)
+{
+  char *os;
+
+  os = s;
+  while(n-- > 0 && (*s++ = *t++) != 0)
+    ;
+  while(n-- > 0)
+    *s++ = 0;
+  return os;
+}
+
+// Like strncpy but guaranteed to NUL-terminate.
+char*
+safestrcpy(char *s, const char *t, int n)
+{
+  char *os;
+
+  os = s;
+  if(n <= 0)
+    return os;
+  while(--n > 0 && (*s++ = *t++) != 0)
+    ;
+  *s = 0;
+  return os;
+}
+
+int
+strlen(const char *s)
+{
+  int n;
+
+  for(n = 0; s[n]; n++)
+    ;
+  return n;
+}
+
diff --git a/xv6-public/swtch.S b/xv6-public/swtch.S
new file mode 100644
index 0000000..63a7dcc
--- /dev/null
+++ b/xv6-public/swtch.S
@@ -0,0 +1,29 @@
+# Context switch
+#
+#   void swtch(struct context **old, struct context *new);
+# 
+# Save the current registers on the stack, creating
+# a struct context, and save its address in *old.
+# Switch stacks to new and pop previously-saved registers.
+
+.globl swtch
+swtch:
+  movl 4(%esp), %eax
+  movl 8(%esp), %edx
+
+  # Save old callee-saved registers
+  pushl %ebp
+  pushl %ebx
+  pushl %esi
+  pushl %edi
+
+  # Switch stacks
+  movl %esp, (%eax)
+  movl %edx, %esp
+
+  # Load new callee-saved registers
+  popl %edi
+  popl %esi
+  popl %ebx
+  popl %ebp
+  ret
diff --git a/xv6-public/syscall.c b/xv6-public/syscall.c
new file mode 100644
index 0000000..9a3be57
--- /dev/null
+++ b/xv6-public/syscall.c
@@ -0,0 +1,186 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+#include "syscall.h"
+
+// User code makes a system call with INT T_SYSCALL.
+// System call number in %eax.
+// Arguments on the stack, from the user call to the C
+// library system call function. The saved user %esp points
+// to a saved program counter, and then the first argument.
+
+// Fetch the int at addr from the current process.
+int
+fetchint(uint addr, int *ip)
+{
+  struct proc *curproc = myproc();
+
+  if(addr >= curproc->sz || addr+4 > curproc->sz)
+    return -1;
+  *ip = *(int*)(addr);
+  return 0;
+}
+
+// Fetch the nul-terminated string at addr from the current process.
+// Doesn't actually copy the string - just sets *pp to point at it.
+// Returns length of string, not including nul.
+int
+fetchstr(uint addr, char **pp)
+{
+  char *s, *ep;
+  struct proc *curproc = myproc();
+
+  if(addr >= curproc->sz)
+    return -1;
+  *pp = (char*)addr;
+  ep = (char*)curproc->sz;
+  for(s = *pp; s < ep; s++){
+    if(*s == 0)
+      return s - *pp;
+  }
+  return -1;
+}
+
+// Fetch the nth 32-bit system call argument.
+int
+argint(int n, int *ip)
+{
+  return fetchint((myproc()->tf->esp) + 4 + 4*n, ip);
+}
+
+// Fetch the nth word-sized system call argument as a pointer
+// to a block of memory of size bytes.  Check that the pointer
+// lies within the process address space.
+int
+argptr(int n, char **pp, int size)
+{
+  int i;
+  struct proc *curproc = myproc();
+ 
+  if(argint(n, &i) < 0)
+    return -1;
+  if(size < 0 || (uint)i >= curproc->sz || (uint)i+size > curproc->sz)
+    return -1;
+  *pp = (char*)i;
+  return 0;
+}
+
+// Fetch the nth word-sized system call argument as a string pointer.
+// Check that the pointer is valid and the string is nul-terminated.
+// (There is no shared writable memory, so the string can't change
+// between this check and being used by the kernel.)
+int
+argstr(int n, char **pp)
+{
+  int addr;
+  if(argint(n, &addr) < 0)
+    return -1;
+  return fetchstr(addr, pp);
+}
+
+extern int sys_chdir(void);
+extern int sys_close(void);
+extern int sys_dup(void);
+extern int sys_dup2(void);
+
+extern int sys_exec(void);
+extern int sys_exit(void);
+extern int sys_fork(void);
+extern int sys_fstat(void);
+extern int sys_getpid(void);
+extern int sys_kill(void);
+extern int sys_link(void);
+extern int sys_mkdir(void);
+extern int sys_mknod(void);
+extern int sys_open(void);
+extern int sys_pipe(void);
+extern int sys_read(void);
+extern int sys_sbrk(void);
+extern int sys_sleep(void);
+extern int sys_unlink(void);
+extern int sys_wait(void);
+extern int sys_write(void);
+extern int sys_uptime(void);
+extern int sys_date(void);
+extern int sys_alarm(void);
+
+// 函数指针数组    
+// 初始化中写 [] 是指syscalls[SYS_fork=1] = sys_fork
+static int (*syscalls[])(void) = {
+[SYS_fork]    sys_fork,
+[SYS_exit]    sys_exit,
+[SYS_wait]    sys_wait,
+[SYS_pipe]    sys_pipe,
+[SYS_read]    sys_read,
+[SYS_kill]    sys_kill,
+[SYS_exec]    sys_exec,
+[SYS_fstat]   sys_fstat,
+[SYS_chdir]   sys_chdir,
+[SYS_dup]     sys_dup,
+[SYS_dup2]    sys_dup2,
+[SYS_getpid]  sys_getpid,
+[SYS_sbrk]    sys_sbrk,
+[SYS_sleep]   sys_sleep,
+[SYS_uptime]  sys_uptime,
+[SYS_open]    sys_open,
+[SYS_write]   sys_write,
+[SYS_mknod]   sys_mknod,
+[SYS_unlink]  sys_unlink,
+[SYS_link]    sys_link,
+[SYS_mkdir]   sys_mkdir,
+[SYS_close]   sys_close,
+[SYS_date]    sys_date,
+[SYS_alarm]   sys_alarm,
+
+};
+/*
+static char *syscall_name[] = {
+[SYS_fork]    "fork",
+[SYS_exit]    "exit",
+[SYS_wait]    "wait",
+[SYS_pipe]    "pipe",
+[SYS_read]    "read",
+[SYS_kill]    "kill",
+[SYS_exec]    "exec",
+[SYS_fstat]   "fstat",
+[SYS_chdir]   "chdir",
+[SYS_dup]     "dup",
+[SYS_getpid]  "getpid",
+[SYS_sbrk]    "sbrk",
+[SYS_sleep]   "sleep",
+[SYS_uptime]  "uptime",
+[SYS_open]    "open",
+[SYS_write]   "write",
+[SYS_mknod]   "mknod",
+[SYS_unlink]  "unlink",
+[SYS_link]    "link",
+[SYS_mkdir]   "mkdir",
+[SYS_close]   "close",
+[SYS_date]	  "date",
+[SYS_alarm]   "alarm",
+
+};
+*/
+
+void
+syscall(void)
+{
+  int num;
+  // 关中断读取进程信息
+  struct proc *curproc = myproc();
+  //num 取值应该[1-最大的系统调用序号]
+  num = curproc->tf->eax;
+  // 检查系统调用是否存在
+  if(num > 0 && num < NELEM(syscalls) && syscalls[num]) {
+     curproc->tf->eax = syscalls[num]();  //存储系统调用返回值
+	 // cprintf("%s: -> %d\n",syscall_name[num], curproc->tf->eax);
+  } else {
+    cprintf("%d %s: unknown sys call %d\n",
+            curproc->pid, curproc->name, num);
+    curproc->tf->eax = -1;
+  }
+}
diff --git a/xv6-public/syscall.h b/xv6-public/syscall.h
new file mode 100644
index 0000000..1f608b0
--- /dev/null
+++ b/xv6-public/syscall.h
@@ -0,0 +1,25 @@
+// System call numbers
+#define SYS_fork    1
+#define SYS_exit    2
+#define SYS_wait    3
+#define SYS_pipe    4
+#define SYS_read    5
+#define SYS_kill    6
+#define SYS_exec    7
+#define SYS_fstat   8
+#define SYS_chdir   9
+#define SYS_dup    10
+#define SYS_getpid 11
+#define SYS_sbrk   12
+#define SYS_sleep  13
+#define SYS_uptime 14
+#define SYS_open   15
+#define SYS_write  16
+#define SYS_mknod  17
+#define SYS_unlink 18
+#define SYS_link   19
+#define SYS_mkdir  20
+#define SYS_close  21
+#define SYS_date   22
+#define SYS_dup2   23
+#define SYS_alarm  24
diff --git a/xv6-public/sysfile.c b/xv6-public/sysfile.c
new file mode 100644
index 0000000..eb240bd
--- /dev/null
+++ b/xv6-public/sysfile.c
@@ -0,0 +1,469 @@
+//
+// File-system system calls.
+// Mostly argument checking, since we don't trust
+// user code, and calls into file.c and fs.c.
+//
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "stat.h"
+#include "mmu.h"
+#include "proc.h"
+#include "fs.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "file.h"
+#include "fcntl.h"
+#include "date.h"
+
+// Fetch the nth word-sized system call argument as a file descriptor
+// and return both the descriptor and the corresponding struct file.
+static int
+argfd(int n, int *pfd, struct file **pf)
+{
+  int fd;
+  struct file *f;
+
+  if(argint(n, &fd) < 0)
+    return -1;
+  if(fd < 0 || fd >= NOFILE || (f=myproc()->ofile[fd]) == 0)
+    return -1;
+  if(pfd)
+    *pfd = fd;
+  if(pf)
+    *pf = f;
+  return 0;
+}
+
+// Allocate a file descriptor for the given file.
+// Takes over file reference from caller on success.
+static int
+fdalloc(struct file *f)
+{
+  int fd;
+  struct proc *curproc = myproc();
+
+  for(fd = 0; fd < NOFILE; fd++){
+    if(curproc->ofile[fd] == 0){
+      curproc->ofile[fd] = f;
+      return fd;
+    }
+  }
+  return -1;
+}
+
+int
+sys_dup(void)
+{
+  struct file *f;
+  int fd;
+
+  if(argfd(0, 0, &f) < 0)
+    return -1;
+  if((fd=fdalloc(f)) < 0)
+    return -1;
+  filedup(f);
+  return fd;
+}
+
+int 
+sys_dup2(void)
+{
+	
int old_fd,new_fd;
+	struct file *f1, *f2;
+	if(argfd(0, &old_fd, &f1) < 0 || argint(1, &new_fd) < 0)
+    	return -1;
+	if(new_fd < 0 || new_fd >= NOFILE)
+    	return -1;
+	if(new_fd != old_fd) {
+		f2 = myproc()->ofile[new_fd];
+		if(f2) {
+			// 检查该文件描述符是否在使用中
+			fileclose(f2);
+		}
+		myproc()->ofile[new_fd] = f1;
+		// 增加文件f1的引用计数
+		filedup(f1);
+	}
+	return new_fd;
+}
+int
+sys_read(void)
+{
+  struct file *f;
+  int n;
+  char *p;
+
+  if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &p, n) < 0)
+    return -1;
+  return fileread(f, p, n);
+}
+
+int
+sys_write(void)
+{
+  struct file *f;
+  int n;
+  char *p;
+
+  if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &p, n) < 0)
+    return -1;
+  return filewrite(f, p, n);
+}
+
+int
+sys_close(void)
+{
+  int fd;
+  struct file *f;
+
+  if(argfd(0, &fd, &f) < 0)
+    return -1;
+  myproc()->ofile[fd] = 0;
+  fileclose(f);
+  return 0;
+}
+
+int
+sys_fstat(void)
+{
+  struct file *f;
+  struct stat *st;
+
+  if(argfd(0, 0, &f) < 0 || argptr(1, (void*)&st, sizeof(*st)) < 0)
+    return -1;
+  return filestat(f, st);
+}
+
+// Create the path new as a link to the same inode as old.
+int
+sys_link(void)
+{
+  char name[DIRSIZ], *new, *old;
+  struct inode *dp, *ip;
+
+  if(argstr(0, &old) < 0 || argstr(1, &new) < 0)
+    return -1;
+
+  begin_op();
+  if((ip = namei(old)) == 0){
+    end_op();
+    return -1;
+  }
+
+  ilock(ip);
+  if(ip->type == T_DIR){
+    iunlockput(ip);
+    end_op();
+    return -1;
+  }
+
+  ip->nlink++;
+  iupdate(ip);
+  iunlock(ip);
+
+  if((dp = nameiparent(new, name)) == 0)
+    goto bad;
+  ilock(dp);
+  if(dp->dev != ip->dev || dirlink(dp, name, ip->inum) < 0){
+    iunlockput(dp);
+    goto bad;
+  }
+  iunlockput(dp);
+  iput(ip);
+
+  end_op();
+
+  return 0;
+
+bad:
+  ilock(ip);
+  ip->nlink--;
+  iupdate(ip);
+  iunlockput(ip);
+  end_op();
+  return -1;
+}
+
+// Is the directory dp empty except for "." and ".." ?
+static int
+isdirempty(struct inode *dp)
+{
+  int off;
+  struct dirent de;
+
+  for(off=2*sizeof(de); off<dp->size; off+=sizeof(de)){
+    if(readi(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
+      panic("isdirempty: readi");
+    if(de.inum != 0)
+      return 0;
+  }
+  return 1;
+}
+
+//PAGEBREAK!
+int
+sys_unlink(void)
+{
+  struct inode *ip, *dp;
+  struct dirent de;
+  char name[DIRSIZ], *path;
+  uint off;
+
+  if(argstr(0, &path) < 0)
+    return -1;
+
+  begin_op();
+  if((dp = nameiparent(path, name)) == 0){
+    end_op();
+    return -1;
+  }
+
+  ilock(dp);
+
+  // Cannot unlink "." or "..".
+  if(namecmp(name, ".") == 0 || namecmp(name, "..") == 0)
+    goto bad;
+
+  if((ip = dirlookup(dp, name, &off)) == 0)
+    goto bad;
+  ilock(ip);
+
+  if(ip->nlink < 1)
+    panic("unlink: nlink < 1");
+  if(ip->type == T_DIR && !isdirempty(ip)){
+    iunlockput(ip);
+    goto bad;
+  }
+
+  memset(&de, 0, sizeof(de));
+  if(writei(dp, (char*)&de, off, sizeof(de)) != sizeof(de))
+    panic("unlink: writei");
+  if(ip->type == T_DIR){
+    dp->nlink--;
+    iupdate(dp);
+  }
+  iunlockput(dp);
+
+  ip->nlink--;
+  iupdate(ip);
+  iunlockput(ip);
+
+  end_op();
+
+  return 0;
+
+bad:
+  iunlockput(dp);
+  end_op();
+  return -1;
+}
+
+static struct inode*
+create(char *path, short type, short major, short minor)
+{
+  uint off;
+  struct inode *ip, *dp;
+  char name[DIRSIZ];
+
+  if((dp = nameiparent(path, name)) == 0)
+    return 0;
+  ilock(dp);
+
+  if((ip = dirlookup(dp, name, &off)) != 0){
+    iunlockput(dp);
+    ilock(ip);
+    if(type == T_FILE && ip->type == T_FILE)
+      return ip;
+    iunlockput(ip);
+    return 0;
+  }
+
+  if((ip = ialloc(dp->dev, type)) == 0)
+    panic("create: ialloc");
+
+  ilock(ip);
+  ip->major = major;
+  ip->minor = minor;
+  ip->nlink = 1;
+  iupdate(ip);
+
+  if(type == T_DIR){  // Create . and .. entries.
+    dp->nlink++;  // for ".."
+    iupdate(dp);
+    // No ip->nlink++ for ".": avoid cyclic ref count.
+    if(dirlink(ip, ".", ip->inum) < 0 || dirlink(ip, "..", dp->inum) < 0)
+      panic("create dots");
+  }
+
+  if(dirlink(dp, name, ip->inum) < 0)
+    panic("create: dirlink");
+
+  iunlockput(dp);
+
+  return ip;
+}
+
+int
+sys_open(void)
+{
+  char *path;
+  int fd, omode;
+  struct file *f;
+  struct inode *ip;
+
+  if(argstr(0, &path) < 0 || argint(1, &omode) < 0)
+    return -1;
+
+  begin_op();
+
+  if(omode & O_CREATE){
+    ip = create(path, T_FILE, 0, 0);
+    if(ip == 0){
+      end_op();
+      return -1;
+    }
+  } else {
+    if((ip = namei(path)) == 0){
+      end_op();
+      return -1;
+    }
+    ilock(ip);
+    if(ip->type == T_DIR && omode != O_RDONLY){
+      iunlockput(ip);
+      end_op();
+      return -1;
+    }
+  }
+
+  if((f = filealloc()) == 0 || (fd = fdalloc(f)) < 0){
+    if(f)
+      fileclose(f);
+    iunlockput(ip);
+    end_op();
+    return -1;
+  }
+  iunlock(ip);
+  end_op();
+
+  f->type = FD_INODE;
+  f->ip = ip;
+  f->off = 0;
+  f->readable = !(omode & O_WRONLY);
+  f->writable = (omode & O_WRONLY) || (omode & O_RDWR);
+  return fd;
+}
+
+int
+sys_mkdir(void)
+{
+  char *path;
+  struct inode *ip;
+
+  begin_op();
+  if(argstr(0, &path) < 0 || (ip = create(path, T_DIR, 0, 0)) == 0){
+    end_op();
+    return -1;
+  }
+  iunlockput(ip);
+  end_op();
+  return 0;
+}
+
+int
+sys_mknod(void)
+{
+  struct inode *ip;
+  char *path;
+  int major, minor;
+
+  begin_op();
+  if((argstr(0, &path)) < 0 ||
+     argint(1, &major) < 0 ||
+     argint(2, &minor) < 0 ||
+     (ip = create(path, T_DEV, major, minor)) == 0){
+    end_op();
+    return -1;
+  }
+  iunlockput(ip);
+  end_op();
+  return 0;
+}
+
+int
+sys_chdir(void)
+{
+  char *path;
+  struct inode *ip;
+  struct proc *curproc = myproc();
+  
+  begin_op();
+  if(argstr(0, &path) < 0 || (ip = namei(path)) == 0){
+    end_op();
+    return -1;
+  }
+  ilock(ip);
+  if(ip->type != T_DIR){
+    iunlockput(ip);
+    end_op();
+    return -1;
+  }
+  iunlock(ip);
+  iput(curproc->cwd);
+  end_op();
+  curproc->cwd = ip;
+  return 0;
+}
+
+int
+sys_exec(void)
+{
+  char *path, *argv[MAXARG];
+  int i;
+  uint uargv, uarg;
+
+  if(argstr(0, &path) < 0 || argint(1, (int*)&uargv) < 0){
+    return -1;
+  }
+  memset(argv, 0, sizeof(argv));
+  for(i=0;; i++){
+    if(i >= NELEM(argv))
+      return -1;
+    if(fetchint(uargv+4*i, (int*)&uarg) < 0)
+      return -1;
+    if(uarg == 0){
+      argv[i] = 0;
+      break;
+    }
+    if(fetchstr(uarg, &argv[i]) < 0)
+      return -1;
+  }
+  return exec(path, argv);
+}
+
+int
+sys_pipe(void)
+{
+  int *fd;
+  struct file *rf, *wf;
+  int fd0, fd1;
+
+  if(argptr(0, (void*)&fd, 2*sizeof(fd[0])) < 0)
+    return -1;
+  if(pipealloc(&rf, &wf) < 0)
+    return -1;
+  fd0 = -1;
+  if((fd0 = fdalloc(rf)) < 0 || (fd1 = fdalloc(wf)) < 0){
+    if(fd0 >= 0)
+      myproc()->ofile[fd0] = 0;
+    fileclose(rf);
+    fileclose(wf);
+    return -1;
+  }
+  fd[0] = fd0;
+  fd[1] = fd1;
+  return 0;
+}
+
+
diff --git a/xv6-public/sysproc.c b/xv6-public/sysproc.c
new file mode 100644
index 0000000..7e62d34
--- /dev/null
+++ b/xv6-public/sysproc.c
@@ -0,0 +1,121 @@
+#include "types.h"
+#include "x86.h"
+#include "defs.h"
+#include "date.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+
+int
+sys_fork(void)
+{
+  return fork();
+}
+
+int
+sys_exit(void)
+{
+  exit();
+  return 0;  // not reached
+}
+
+int
+sys_wait(void)
+{
+  return wait();
+}
+
+int
+sys_kill(void)
+{
+  int pid;
+
+  if(argint(0, &pid) < 0)
+    return -1;
+  return kill(pid);
+}
+
+int
+sys_getpid(void)
+{
+  return myproc()->pid;
+}
+
+int
+sys_sbrk(void)
+{
+  int addr;
+  int n;
+
+  if(argint(0, &n) < 0)
+    return -1;
+  addr = myproc()->sz;
+  myproc()->sz += n;
+  return addr;
+}
+
+int
+sys_sleep(void)
+{
+  int n;
+  uint ticks0;
+
+  if(argint(0, &n) < 0)
+    return -1;
+  acquire(&tickslock);
+  ticks0 = ticks;
+  while(ticks - ticks0 < n){
+    if(myproc()->killed){
+      release(&tickslock);
+      return -1;
+    }
+    sleep(&ticks, &tickslock);
+  }
+  release(&tickslock);
+  return 0;
+}
+
+// return how many clock tick interrupts have occurred
+// since start.
+int
+sys_uptime(void)
+{
+  uint xticks;
+
+  acquire(&tickslock);
+  xticks = ticks;
+  release(&tickslock);
+  return xticks;
+}
+
+int
+sys_date(void) 
+{
+	struct rtcdate *r;
+	if(argptr(0, (void*)&r, sizeof(struct rtcdate)) < 0)
+    	return -1;
+	
cmostime(r);
+	return 0;
+}
+
+int
+sys_alarm(void) 
+{
+	// 间隔 
+	int interval;
+	// 函数指针
+	void (*handler)(void);
+	
+	if(argint(0, &interval) < 0)
+		return -1;
+	if(argptr(1, (char **)&handler, 1) < 0)
+		return -1;
+
+	myproc()->alarminterval = interval;
+	myproc()->alarmhandler = handler;
+	return 0;
+	
+}
+
+
diff --git a/xv6-public/toc.ftr b/xv6-public/toc.ftr
new file mode 100644
index 0000000..0061c1d
--- /dev/null
+++ b/xv6-public/toc.ftr
@@ -0,0 +1,13 @@
+
+
+The source listing is preceded by a cross-reference that lists every defined 
+constant, struct, global variable, and function in xv6.  Each entry gives,
+on the same line as the name, the line number (or, in a few cases, numbers)
+where the name is defined.  Successive lines in an entry list the line
+numbers where the name is used.  For example, this entry:
+
+    swtch 2658
+        0374 2428 2466 2657 2658
+
+indicates that swtch is defined on line 2658 and is mentioned on five lines
+on sheets 03, 24, and 26.
diff --git a/xv6-public/toc.hdr b/xv6-public/toc.hdr
new file mode 100644
index 0000000..3698d81
--- /dev/null
+++ b/xv6-public/toc.hdr
@@ -0,0 +1,6 @@
+The numbers to the left of the file names in the table are sheet numbers.
+The source code has been printed in a double column format with fifty
+lines per column, giving one hundred lines per sheet (or page).
+Thus there is a convenient relationship between line numbers and sheet numbers.
+
+
diff --git a/xv6-public/trap.c b/xv6-public/trap.c
new file mode 100644
index 0000000..273ce11
--- /dev/null
+++ b/xv6-public/trap.c
@@ -0,0 +1,148 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+#include "traps.h"
+#include "spinlock.h"
+
+// Interrupt descriptor table (shared by all CPUs).
+struct gatedesc idt[256];
+extern uint vectors[];  // in vectors.S: array of 256 entry pointers
+struct spinlock tickslock;
+uint ticks;
+
+void
+tvinit(void)
+{
+  int i;
+
+  for(i = 0; i < 256; i++)
+    SETGATE(idt[i], 0, SEG_KCODE<<3, vectors[i], 0);
+  SETGATE(idt[T_SYSCALL], 1, SEG_KCODE<<3, vectors[T_SYSCALL], DPL_USER);
+
+  initlock(&tickslock, "time");
+}
+
+void
+idtinit(void)
+{
+  lidt(idt, sizeof(idt));
+}
+
+
+
+
+//PAGEBREAK: 41
+void
+trap(struct trapframe *tf)
+{
+  if(tf->trapno == T_SYSCALL){
+    if(myproc()->killed)
+      exit();
+    myproc()->tf = tf;
+    syscall();
+    if(myproc()->killed)
+      exit();
+    return;
+  }
+  char *mem;
+  switch(tf->trapno){
+  case T_IRQ0 + IRQ_TIMER:
+    if(cpuid() == 0){
+      acquire(&tickslock);
+      ticks++;
+	  
+      wakeup(&ticks);
+      release(&tickslock);
+    }
+	if(myproc() != 0 && (tf->cs & 3) == 3){
+		myproc()->ticks++;
+		// 没有alarm任务的proc, 不会进入以下if,因为alarminterval为0
+		if(myproc()->ticks == myproc()->alarminterval) {
+			myproc()->ticks = 0;
+			// 为什么不能像下面这样调用函数
+			//myproc()->alarmhandler();
+			tf->esp -= 4;
+			// eip压栈
+			*(uint *)(tf->esp) = tf->eip;
+			tf->eip = (uint)myproc()->alarmhandler;
+	  	}
+	}
+	
+    lapiceoi();
+    break;
+  case T_IRQ0 + IRQ_IDE:
+    ideintr();
+    lapiceoi();
+    break;
+  case T_IRQ0 + IRQ_IDE+1:
+    // Bochs generates spurious IDE1 interrupts.
+    break;
+  case T_IRQ0 + IRQ_KBD:
+    kbdintr();
+    lapiceoi();
+    break;
+  case T_IRQ0 + IRQ_COM1:
+    uartintr();
+    lapiceoi();
+    break;
+  case T_IRQ0 + 7:
+  case T_IRQ0 + IRQ_SPURIOUS:
+    cprintf("cpu%d: spurious interrupt at %x:%x\n",
+            cpuid(), tf->cs, tf->eip);
+    lapiceoi();
+    break;
+
+  // T_PGFLT = 14
+  case T_PGFLT: 
+    // kallo或mappages执行失败，则继续执行下面的default.
+    // In user space, assume process misbehaved.
+    // cr2包含发生页面错误时的线性地址.
+    mem = kalloc();
+    if(mem != 0){
+        uint va = PGROUNDDOWN(rcr2());
+	    memset(mem, 0, PGSIZE);
+		extern int mappages(pde_t *pgdir, void *va, uint size, uint pa, int perm);
+		if(mappages(myproc()->pgdir,(void *)va, PGSIZE, V2P(mem), PTE_W|PTE_U) >= 0) {
+			// 全部执行成功才break;
+			break;	
+		}
+    }
+	
+  //PAGEBREAK: 13
+  default:
+    // tf->cs&3 不明白
+    if(myproc() == 0 || (tf->cs&3) == 0){
+      // In kernel, it must be our mistake.
+      cprintf("unexpected trap %d from cpu %d eip %x (cr2=0x%x)\n",
+              tf->trapno, cpuid(), tf->eip, rcr2());
+      panic("trap");
+    }
+    // In user space, assume process misbehaved.
+   
+    cprintf("pid %d %s: trap %d err %d on cpu %d "
+            "eip 0x%x addr 0x%x--kill proc\n",
+            myproc()->pid, myproc()->name, tf->trapno,
+            tf->err, cpuid(), tf->eip, rcr2());
+    myproc()->killed = 1;
+  }
+
+  // Force process exit if it has been killed and is in user space.
+  // (If it is still executing in the kernel, let it keep running
+  // until it gets to the regular system call return.)
+  if(myproc() && myproc()->killed && (tf->cs&3) == DPL_USER)
+    exit();
+
+  // Force process to give up CPU on clock tick.
+  // If interrupts were on while locks held, would need to check nlock.
+  if(myproc() && myproc()->state == RUNNING &&
+     tf->trapno == T_IRQ0+IRQ_TIMER)
+    yield();
+
+  // Check if the process has been killed since we yielded
+  if(myproc() && myproc()->killed && (tf->cs&3) == DPL_USER)
+    exit();
+}
diff --git a/xv6-public/trapasm.S b/xv6-public/trapasm.S
new file mode 100644
index 0000000..da8aefc
--- /dev/null
+++ b/xv6-public/trapasm.S
@@ -0,0 +1,32 @@
+#include "mmu.h"
+
+  # vectors.S sends all traps here.
+.globl alltraps
+alltraps:
+  # Build trap frame.
+  pushl %ds
+  pushl %es
+  pushl %fs
+  pushl %gs
+  pushal
+  
+  # Set up data segments.
+  movw $(SEG_KDATA<<3), %ax
+  movw %ax, %ds
+  movw %ax, %es
+
+  # Call trap(tf), where tf=%esp
+  pushl %esp
+  call trap
+  addl $4, %esp
+
+  # Return falls through to trapret...
+.globl trapret
+trapret:
+  popal
+  popl %gs
+  popl %fs
+  popl %es
+  popl %ds
+  addl $0x8, %esp  # trapno and errcode
+  iret
diff --git a/xv6-public/traps.h b/xv6-public/traps.h
new file mode 100644
index 0000000..0bd1fd8
--- /dev/null
+++ b/xv6-public/traps.h
@@ -0,0 +1,38 @@
+// x86 trap and interrupt constants.
+
+// Processor-defined:
+#define T_DIVIDE         0      // divide error
+#define T_DEBUG          1      // debug exception
+#define T_NMI            2      // non-maskable interrupt
+#define T_BRKPT          3      // breakpoint
+#define T_OFLOW          4      // overflow
+#define T_BOUND          5      // bounds check
+#define T_ILLOP          6      // illegal opcode
+#define T_DEVICE         7      // device not available
+#define T_DBLFLT         8      // double fault
+// #define T_COPROC      9      // reserved (not used since 486)
+#define T_TSS           10      // invalid task switch segment
+#define T_SEGNP         11      // segment not present
+#define T_STACK         12      // stack exception
+#define T_GPFLT         13      // general protection fault
+#define T_PGFLT         14      // page fault
+// #define T_RES        15      // reserved
+#define T_FPERR         16      // floating point error
+#define T_ALIGN         17      // aligment check
+#define T_MCHK          18      // machine check
+#define T_SIMDERR       19      // SIMD floating point error
+
+// These are arbitrarily chosen, but with care not to overlap
+// processor defined exceptions or interrupt vectors.
+#define T_SYSCALL       64      // system call
+#define T_DEFAULT      500      // catchall
+
+#define T_IRQ0          32      // IRQ 0 corresponds to int T_IRQ
+
+#define IRQ_TIMER        0
+#define IRQ_KBD          1
+#define IRQ_COM1         4
+#define IRQ_IDE         14
+#define IRQ_ERROR       19
+#define IRQ_SPURIOUS    31
+
diff --git a/xv6-public/types.h b/xv6-public/types.h
new file mode 100644
index 0000000..e4adf64
--- /dev/null
+++ b/xv6-public/types.h
@@ -0,0 +1,4 @@
+typedef unsigned int   uint;
+typedef unsigned short ushort;
+typedef unsigned char  uchar;
+typedef uint pde_t;
diff --git a/xv6-public/uart.c b/xv6-public/uart.c
new file mode 100644
index 0000000..b8946da
--- /dev/null
+++ b/xv6-public/uart.c
@@ -0,0 +1,77 @@
+// Intel 8250 serial port (UART).
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "traps.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "fs.h"
+#include "file.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+
+#define COM1    0x3f8
+
+static int uart;    // is there a uart?
+
+void
+uartinit(void)
+{
+  char *p;
+
+  // Turn off the FIFO
+  outb(COM1+2, 0);
+
+  // 9600 baud, 8 data bits, 1 stop bit, parity off.
+  outb(COM1+3, 0x80);    // Unlock divisor
+  outb(COM1+0, 115200/9600);
+  outb(COM1+1, 0);
+  outb(COM1+3, 0x03);    // Lock divisor, 8 data bits.
+  outb(COM1+4, 0);
+  outb(COM1+1, 0x01);    // Enable receive interrupts.
+
+  // If status is 0xFF, no serial port.
+  if(inb(COM1+5) == 0xFF)
+    return;
+  uart = 1;
+
+  // Acknowledge pre-existing interrupt conditions;
+  // enable interrupts.
+  inb(COM1+2);
+  inb(COM1+0);
+  ioapicenable(IRQ_COM1, 0);
+
+  // Announce that we're here.
+  for(p="xv6...\n"; *p; p++)
+    uartputc(*p);
+}
+
+void
+uartputc(int c)
+{
+  int i;
+
+  if(!uart)
+    return;
+  for(i = 0; i < 128 && !(inb(COM1+5) & 0x20); i++)
+    microdelay(10);
+  outb(COM1+0, c);
+}
+
+static int
+uartgetc(void)
+{
+  if(!uart)
+    return -1;
+  if(!(inb(COM1+5) & 0x01))
+    return -1;
+  return inb(COM1+0);
+}
+
+void
+uartintr(void)
+{
+  consoleintr(uartgetc);
+}
diff --git a/xv6-public/ulib.c b/xv6-public/ulib.c
new file mode 100644
index 0000000..8e1e1a2
--- /dev/null
+++ b/xv6-public/ulib.c
@@ -0,0 +1,106 @@
+#include "types.h"
+#include "stat.h"
+#include "fcntl.h"
+#include "user.h"
+#include "x86.h"
+
+char*
+strcpy(char *s, const char *t)
+{
+  char *os;
+
+  os = s;
+  while((*s++ = *t++) != 0)
+    ;
+  return os;
+}
+
+int
+strcmp(const char *p, const char *q)
+{
+  while(*p && *p == *q)
+    p++, q++;
+  return (uchar)*p - (uchar)*q;
+}
+
+uint
+strlen(const char *s)
+{
+  int n;
+
+  for(n = 0; s[n]; n++)
+    ;
+  return n;
+}
+
+void*
+memset(void *dst, int c, uint n)
+{
+  stosb(dst, c, n);
+  return dst;
+}
+
+char*
+strchr(const char *s, char c)
+{
+  for(; *s; s++)
+    if(*s == c)
+      return (char*)s;
+  return 0;
+}
+
+char*
+gets(char *buf, int max)
+{
+  int i, cc;
+  char c;
+
+  for(i=0; i+1 < max; ){
+    cc = read(0, &c, 1);
+    if(cc < 1)
+      break;
+    buf[i++] = c;
+    if(c == '\n' || c == '\r')
+      break;
+  }
+  buf[i] = '\0';
+  return buf;
+}
+
+int
+stat(const char *n, struct stat *st)
+{
+  int fd;
+  int r;
+
+  fd = open(n, O_RDONLY);
+  if(fd < 0)
+    return -1;
+  r = fstat(fd, st);
+  close(fd);
+  return r;
+}
+
+int
+atoi(const char *s)
+{
+  int n;
+
+  n = 0;
+  while('0' <= *s && *s <= '9')
+    n = n*10 + *s++ - '0';
+  return n;
+}
+
+void*
+memmove(void *vdst, const void *vsrc, int n)
+{
+  char *dst;
+  const char *src;
+
+  dst = vdst;
+  src = vsrc;
+  while(n-- > 0)
+    *dst++ = *src++;
+  return vdst;
+}
diff --git a/xv6-public/umalloc.c b/xv6-public/umalloc.c
new file mode 100644
index 0000000..a7e7d2c
--- /dev/null
+++ b/xv6-public/umalloc.c
@@ -0,0 +1,90 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+#include "param.h"
+
+// Memory allocator by Kernighan and Ritchie,
+// The C programming Language, 2nd ed.  Section 8.7.
+
+typedef long Align;
+
+union header {
+  struct {
+    union header *ptr;
+    uint size;
+  } s;
+  Align x;
+};
+
+typedef union header Header;
+
+static Header base;
+static Header *freep;
+
+void
+free(void *ap)
+{
+  Header *bp, *p;
+
+  bp = (Header*)ap - 1;
+  for(p = freep; !(bp > p && bp < p->s.ptr); p = p->s.ptr)
+    if(p >= p->s.ptr && (bp > p || bp < p->s.ptr))
+      break;
+  if(bp + bp->s.size == p->s.ptr){
+    bp->s.size += p->s.ptr->s.size;
+    bp->s.ptr = p->s.ptr->s.ptr;
+  } else
+    bp->s.ptr = p->s.ptr;
+  if(p + p->s.size == bp){
+    p->s.size += bp->s.size;
+    p->s.ptr = bp->s.ptr;
+  } else
+    p->s.ptr = bp;
+  freep = p;
+}
+
+static Header*
+morecore(uint nu)
+{
+  char *p;
+  Header *hp;
+
+  if(nu < 4096)
+    nu = 4096;
+  p = sbrk(nu * sizeof(Header));
+  if(p == (char*)-1)
+    return 0;
+  hp = (Header*)p;
+  hp->s.size = nu;
+  free((void*)(hp + 1));
+  return freep;
+}
+
+void*
+malloc(uint nbytes)
+{
+  Header *p, *prevp;
+  uint nunits;
+
+  nunits = (nbytes + sizeof(Header) - 1)/sizeof(Header) + 1;
+  if((prevp = freep) == 0){
+    base.s.ptr = freep = prevp = &base;
+    base.s.size = 0;
+  }
+  for(p = prevp->s.ptr; ; prevp = p, p = p->s.ptr){
+    if(p->s.size >= nunits){
+      if(p->s.size == nunits)
+        prevp->s.ptr = p->s.ptr;
+      else {
+        p->s.size -= nunits;
+        p += p->s.size;
+        p->s.size = nunits;
+      }
+      freep = prevp;
+      return (void*)(p + 1);
+    }
+    if(p == freep)
+      if((p = morecore(nunits)) == 0)
+        return 0;
+  }
+}
diff --git a/xv6-public/user.h b/xv6-public/user.h
new file mode 100644
index 0000000..11e86aa
--- /dev/null
+++ b/xv6-public/user.h
@@ -0,0 +1,44 @@
+struct stat;
+struct rtcdate;
+
+// system calls
+int fork(void);
+int exit(void) __attribute__((noreturn));
+int wait(void);
+int pipe(int*);
+int write(int, const void*, int);
+int read(int, void*, int);
+int close(int);
+int kill(int);
+int exec(char*, char**);
+int open(const char*, int);
+int mknod(const char*, short, short);
+int unlink(const char*);
+int fstat(int fd, struct stat*);
+int link(const char*, const char*);
+int mkdir(const char*);
+int chdir(const char*);
+int dup(int);
+int getpid(void);
+char* sbrk(int);
+int sleep(int);
+int uptime(void);
+int date(struct rtcdate* );
+int dup2(int , int);
+int alarm(int, void (*)());
+
+
+
+// ulib.c
+int stat(const char*, struct stat*);
+char* strcpy(char*, const char*);
+void *memmove(void*, const void*, int);
+char* strchr(const char*, char c);
+int strcmp(const char*, const char*);
+void printf(int, const char*, ...);
+char* gets(char*, int max);
+uint strlen(const char*);
+void* memset(void*, int, uint);
+void* malloc(uint);
+void free(void*);
+int atoi(const char*);
diff --git a/xv6-public/usertests.c b/xv6-public/usertests.c
new file mode 100644
index 0000000..a1e97e7
--- /dev/null
+++ b/xv6-public/usertests.c
@@ -0,0 +1,1803 @@
+#include "param.h"
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+#include "fs.h"
+#include "fcntl.h"
+#include "syscall.h"
+#include "traps.h"
+#include "memlayout.h"
+
+char buf[8192];
+char name[3];
+char *echoargv[] = { "echo", "ALL", "TESTS", "PASSED", 0 };
+int stdout = 1;
+
+// does chdir() call iput(p->cwd) in a transaction?
+void
+iputtest(void)
+{
+  printf(stdout, "iput test\n");
+
+  if(mkdir("iputdir") < 0){
+    printf(stdout, "mkdir failed\n");
+    exit();
+  }
+  if(chdir("iputdir") < 0){
+    printf(stdout, "chdir iputdir failed\n");
+    exit();
+  }
+  if(unlink("../iputdir") < 0){
+    printf(stdout, "unlink ../iputdir failed\n");
+    exit();
+  }
+  if(chdir("/") < 0){
+    printf(stdout, "chdir / failed\n");
+    exit();
+  }
+  printf(stdout, "iput test ok\n");
+}
+
+// does exit() call iput(p->cwd) in a transaction?
+void
+exitiputtest(void)
+{
+  int pid;
+
+  printf(stdout, "exitiput test\n");
+
+  pid = fork();
+  if(pid < 0){
+    printf(stdout, "fork failed\n");
+    exit();
+  }
+  if(pid == 0){
+    if(mkdir("iputdir") < 0){
+      printf(stdout, "mkdir failed\n");
+      exit();
+    }
+    if(chdir("iputdir") < 0){
+      printf(stdout, "child chdir failed\n");
+      exit();
+    }
+    if(unlink("../iputdir") < 0){
+      printf(stdout, "unlink ../iputdir failed\n");
+      exit();
+    }
+    exit();
+  }
+  wait();
+  printf(stdout, "exitiput test ok\n");
+}
+
+// does the error path in open() for attempt to write a
+// directory call iput() in a transaction?
+// needs a hacked kernel that pauses just after the namei()
+// call in sys_open():
+//    if((ip = namei(path)) == 0)
+//      return -1;
+//    {
+//      int i;
+//      for(i = 0; i < 10000; i++)
+//        yield();
+//    }
+void
+openiputtest(void)
+{
+  int pid;
+
+  printf(stdout, "openiput test\n");
+  if(mkdir("oidir") < 0){
+    printf(stdout, "mkdir oidir failed\n");
+    exit();
+  }
+  pid = fork();
+  if(pid < 0){
+    printf(stdout, "fork failed\n");
+    exit();
+  }
+  if(pid == 0){
+    int fd = open("oidir", O_RDWR);
+    if(fd >= 0){
+      printf(stdout, "open directory for write succeeded\n");
+      exit();
+    }
+    exit();
+  }
+  sleep(1);
+  if(unlink("oidir") != 0){
+    printf(stdout, "unlink failed\n");
+    exit();
+  }
+  wait();
+  printf(stdout, "openiput test ok\n");
+}
+
+// simple file system tests
+
+void
+opentest(void)
+{
+  int fd;
+
+  printf(stdout, "open test\n");
+  fd = open("echo", 0);
+  if(fd < 0){
+    printf(stdout, "open echo failed!\n");
+    exit();
+  }
+  close(fd);
+  fd = open("doesnotexist", 0);
+  if(fd >= 0){
+    printf(stdout, "open doesnotexist succeeded!\n");
+    exit();
+  }
+  printf(stdout, "open test ok\n");
+}
+
+void
+writetest(void)
+{
+  int fd;
+  int i;
+
+  printf(stdout, "small file test\n");
+  fd = open("small", O_CREATE|O_RDWR);
+  if(fd >= 0){
+    printf(stdout, "creat small succeeded; ok\n");
+  } else {
+    printf(stdout, "error: creat small failed!\n");
+    exit();
+  }
+  for(i = 0; i < 100; i++){
+    if(write(fd, "aaaaaaaaaa", 10) != 10){
+      printf(stdout, "error: write aa %d new file failed\n", i);
+      exit();
+    }
+    if(write(fd, "bbbbbbbbbb", 10) != 10){
+      printf(stdout, "error: write bb %d new file failed\n", i);
+      exit();
+    }
+  }
+  printf(stdout, "writes ok\n");
+  close(fd);
+  fd = open("small", O_RDONLY);
+  if(fd >= 0){
+    printf(stdout, "open small succeeded ok\n");
+  } else {
+    printf(stdout, "error: open small failed!\n");
+    exit();
+  }
+  i = read(fd, buf, 2000);
+  if(i == 2000){
+    printf(stdout, "read succeeded ok\n");
+  } else {
+    printf(stdout, "read failed\n");
+    exit();
+  }
+  close(fd);
+
+  if(unlink("small") < 0){
+    printf(stdout, "unlink small failed\n");
+    exit();
+  }
+  printf(stdout, "small file test ok\n");
+}
+
+void
+writetest1(void)
+{
+  int i, fd, n;
+
+  printf(stdout, "big files test\n");
+
+  fd = open("big", O_CREATE|O_RDWR);
+  if(fd < 0){
+    printf(stdout, "error: creat big failed!\n");
+    exit();
+  }
+
+  for(i = 0; i < MAXFILE; i++){
+    ((int*)buf)[0] = i;
+    if(write(fd, buf, 512) != 512){
+      printf(stdout, "error: write big file failed\n", i);
+      exit();
+    }
+  }
+
+  close(fd);
+
+  fd = open("big", O_RDONLY);
+  if(fd < 0){
+    printf(stdout, "error: open big failed!\n");
+    exit();
+  }
+
+  n = 0;
+  for(;;){
+    i = read(fd, buf, 512);
+    if(i == 0){
+      if(n == MAXFILE - 1){
+        printf(stdout, "read only %d blocks from big", n);
+        exit();
+      }
+      break;
+    } else if(i != 512){
+      printf(stdout, "read failed %d\n", i);
+      exit();
+    }
+    if(((int*)buf)[0] != n){
+      printf(stdout, "read content of block %d is %d\n",
+             n, ((int*)buf)[0]);
+      exit();
+    }
+    n++;
+  }
+  close(fd);
+  if(unlink("big") < 0){
+    printf(stdout, "unlink big failed\n");
+    exit();
+  }
+  printf(stdout, "big files ok\n");
+}
+
+void
+createtest(void)
+{
+  int i, fd;
+
+  printf(stdout, "many creates, followed by unlink test\n");
+
+  name[0] = 'a';
+  name[2] = '\0';
+  for(i = 0; i < 52; i++){
+    name[1] = '0' + i;
+    fd = open(name, O_CREATE|O_RDWR);
+    close(fd);
+  }
+  name[0] = 'a';
+  name[2] = '\0';
+  for(i = 0; i < 52; i++){
+    name[1] = '0' + i;
+    unlink(name);
+  }
+  printf(stdout, "many creates, followed by unlink; ok\n");
+}
+
+void dirtest(void)
+{
+  printf(stdout, "mkdir test\n");
+
+  if(mkdir("dir0") < 0){
+    printf(stdout, "mkdir failed\n");
+    exit();
+  }
+
+  if(chdir("dir0") < 0){
+    printf(stdout, "chdir dir0 failed\n");
+    exit();
+  }
+
+  if(chdir("..") < 0){
+    printf(stdout, "chdir .. failed\n");
+    exit();
+  }
+
+  if(unlink("dir0") < 0){
+    printf(stdout, "unlink dir0 failed\n");
+    exit();
+  }
+  printf(stdout, "mkdir test ok\n");
+}
+
+void
+exectest(void)
+{
+  printf(stdout, "exec test\n");
+  if(exec("echo", echoargv) < 0){
+    printf(stdout, "exec echo failed\n");
+    exit();
+  }
+}
+
+// simple fork and pipe read/write
+
+void
+pipe1(void)
+{
+  int fds[2], pid;
+  int seq, i, n, cc, total;
+
+  if(pipe(fds) != 0){
+    printf(1, "pipe() failed\n");
+    exit();
+  }
+  pid = fork();
+  seq = 0;
+  if(pid == 0){
+    close(fds[0]);
+    for(n = 0; n < 5; n++){
+      for(i = 0; i < 1033; i++)
+        buf[i] = seq++;
+      if(write(fds[1], buf, 1033) != 1033){
+        printf(1, "pipe1 oops 1\n");
+        exit();
+      }
+    }
+    exit();
+  } else if(pid > 0){
+    close(fds[1]);
+    total = 0;
+    cc = 1;
+    while((n = read(fds[0], buf, cc)) > 0){
+      for(i = 0; i < n; i++){
+        if((buf[i] & 0xff) != (seq++ & 0xff)){
+          printf(1, "pipe1 oops 2\n");
+          return;
+        }
+      }
+      total += n;
+      cc = cc * 2;
+      if(cc > sizeof(buf))
+        cc = sizeof(buf);
+    }
+    if(total != 5 * 1033){
+      printf(1, "pipe1 oops 3 total %d\n", total);
+      exit();
+    }
+    close(fds[0]);
+    wait();
+  } else {
+    printf(1, "fork() failed\n");
+    exit();
+  }
+  printf(1, "pipe1 ok\n");
+}
+
+// meant to be run w/ at most two CPUs
+void
+preempt(void)
+{
+  int pid1, pid2, pid3;
+  int pfds[2];
+
+  printf(1, "preempt: ");
+  pid1 = fork();
+  if(pid1 == 0)
+    for(;;)
+      ;
+
+  pid2 = fork();
+  if(pid2 == 0)
+    for(;;)
+      ;
+
+  pipe(pfds);
+  pid3 = fork();
+  if(pid3 == 0){
+    close(pfds[0]);
+    if(write(pfds[1], "x", 1) != 1)
+      printf(1, "preempt write error");
+    close(pfds[1]);
+    for(;;)
+      ;
+  }
+
+  close(pfds[1]);
+  if(read(pfds[0], buf, sizeof(buf)) != 1){
+    printf(1, "preempt read error");
+    return;
+  }
+  close(pfds[0]);
+  printf(1, "kill... ");
+  kill(pid1);
+  kill(pid2);
+  kill(pid3);
+  printf(1, "wait... ");
+  wait();
+  wait();
+  wait();
+  printf(1, "preempt ok\n");
+}
+
+// try to find any races between exit and wait
+void
+exitwait(void)
+{
+  int i, pid;
+
+  for(i = 0; i < 100; i++){
+    pid = fork();
+    if(pid < 0){
+      printf(1, "fork failed\n");
+      return;
+    }
+    if(pid){
+      if(wait() != pid){
+        printf(1, "wait wrong pid\n");
+        return;
+      }
+    } else {
+      exit();
+    }
+  }
+  printf(1, "exitwait ok\n");
+}
+
+void
+mem(void)
+{
+  void *m1, *m2;
+  int pid, ppid;
+
+  printf(1, "mem test\n");
+  ppid = getpid();
+  if((pid = fork()) == 0){
+    m1 = 0;
+    while((m2 = malloc(10001)) != 0){
+      *(char**)m2 = m1;
+      m1 = m2;
+    }
+    while(m1){
+      m2 = *(char**)m1;
+      free(m1);
+      m1 = m2;
+    }
+    m1 = malloc(1024*20);
+    if(m1 == 0){
+      printf(1, "couldn't allocate mem?!!\n");
+      kill(ppid);
+      exit();
+    }
+    free(m1);
+    printf(1, "mem ok\n");
+    exit();
+  } else {
+    wait();
+  }
+}
+
+// More file system tests
+
+// two processes write to the same file descriptor
+// is the offset shared? does inode locking work?
+void
+sharedfd(void)
+{
+  int fd, pid, i, n, nc, np;
+  char buf[10];
+
+  printf(1, "sharedfd test\n");
+
+  unlink("sharedfd");
+  fd = open("sharedfd", O_CREATE|O_RDWR);
+  if(fd < 0){
+    printf(1, "fstests: cannot open sharedfd for writing");
+    return;
+  }
+  pid = fork();
+  memset(buf, pid==0?'c':'p', sizeof(buf));
+  for(i = 0; i < 1000; i++){
+    if(write(fd, buf, sizeof(buf)) != sizeof(buf)){
+      printf(1, "fstests: write sharedfd failed\n");
+      break;
+    }
+  }
+  if(pid == 0)
+    exit();
+  else
+    wait();
+  close(fd);
+  fd = open("sharedfd", 0);
+  if(fd < 0){
+    printf(1, "fstests: cannot open sharedfd for reading\n");
+    return;
+  }
+  nc = np = 0;
+  while((n = read(fd, buf, sizeof(buf))) > 0){
+    for(i = 0; i < sizeof(buf); i++){
+      if(buf[i] == 'c')
+        nc++;
+      if(buf[i] == 'p')
+        np++;
+    }
+  }
+  close(fd);
+  unlink("sharedfd");
+  if(nc == 10000 && np == 10000){
+    printf(1, "sharedfd ok\n");
+  } else {
+    printf(1, "sharedfd oops %d %d\n", nc, np);
+    exit();
+  }
+}
+
+// four processes write different files at the same
+// time, to test block allocation.
+void
+fourfiles(void)
+{
+  int fd, pid, i, j, n, total, pi;
+  char *names[] = { "f0", "f1", "f2", "f3" };
+  char *fname;
+
+  printf(1, "fourfiles test\n");
+
+  for(pi = 0; pi < 4; pi++){
+    fname = names[pi];
+    unlink(fname);
+
+    pid = fork();
+    if(pid < 0){
+      printf(1, "fork failed\n");
+      exit();
+    }
+
+    if(pid == 0){
+      fd = open(fname, O_CREATE | O_RDWR);
+      if(fd < 0){
+        printf(1, "create failed\n");
+        exit();
+      }
+
+      memset(buf, '0'+pi, 512);
+      for(i = 0; i < 12; i++){
+        if((n = write(fd, buf, 500)) != 500){
+          printf(1, "write failed %d\n", n);
+          exit();
+        }
+      }
+      exit();
+    }
+  }
+
+  for(pi = 0; pi < 4; pi++){
+    wait();
+  }
+
+  for(i = 0; i < 2; i++){
+    fname = names[i];
+    fd = open(fname, 0);
+    total = 0;
+    while((n = read(fd, buf, sizeof(buf))) > 0){
+      for(j = 0; j < n; j++){
+        if(buf[j] != '0'+i){
+          printf(1, "wrong char\n");
+          exit();
+        }
+      }
+      total += n;
+    }
+    close(fd);
+    if(total != 12*500){
+      printf(1, "wrong length %d\n", total);
+      exit();
+    }
+    unlink(fname);
+  }
+
+  printf(1, "fourfiles ok\n");
+}
+
+// four processes create and delete different files in same directory
+void
+createdelete(void)
+{
+  enum { N = 20 };
+  int pid, i, fd, pi;
+  char name[32];
+
+  printf(1, "createdelete test\n");
+
+  for(pi = 0; pi < 4; pi++){
+    pid = fork();
+    if(pid < 0){
+      printf(1, "fork failed\n");
+      exit();
+    }
+
+    if(pid == 0){
+      name[0] = 'p' + pi;
+      name[2] = '\0';
+      for(i = 0; i < N; i++){
+        name[1] = '0' + i;
+        fd = open(name, O_CREATE | O_RDWR);
+        if(fd < 0){
+          printf(1, "create failed\n");
+          exit();
+        }
+        close(fd);
+        if(i > 0 && (i % 2 ) == 0){
+          name[1] = '0' + (i / 2);
+          if(unlink(name) < 0){
+            printf(1, "unlink failed\n");
+            exit();
+          }
+        }
+      }
+      exit();
+    }
+  }
+
+  for(pi = 0; pi < 4; pi++){
+    wait();
+  }
+
+  name[0] = name[1] = name[2] = 0;
+  for(i = 0; i < N; i++){
+    for(pi = 0; pi < 4; pi++){
+      name[0] = 'p' + pi;
+      name[1] = '0' + i;
+      fd = open(name, 0);
+      if((i == 0 || i >= N/2) && fd < 0){
+        printf(1, "oops createdelete %s didn't exist\n", name);
+        exit();
+      } else if((i >= 1 && i < N/2) && fd >= 0){
+        printf(1, "oops createdelete %s did exist\n", name);
+        exit();
+      }
+      if(fd >= 0)
+        close(fd);
+    }
+  }
+
+  for(i = 0; i < N; i++){
+    for(pi = 0; pi < 4; pi++){
+      name[0] = 'p' + i;
+      name[1] = '0' + i;
+      unlink(name);
+    }
+  }
+
+  printf(1, "createdelete ok\n");
+}
+
+// can I unlink a file and still read it?
+void
+unlinkread(void)
+{
+  int fd, fd1;
+
+  printf(1, "unlinkread test\n");
+  fd = open("unlinkread", O_CREATE | O_RDWR);
+  if(fd < 0){
+    printf(1, "create unlinkread failed\n");
+    exit();
+  }
+  write(fd, "hello", 5);
+  close(fd);
+
+  fd = open("unlinkread", O_RDWR);
+  if(fd < 0){
+    printf(1, "open unlinkread failed\n");
+    exit();
+  }
+  if(unlink("unlinkread") != 0){
+    printf(1, "unlink unlinkread failed\n");
+    exit();
+  }
+
+  fd1 = open("unlinkread", O_CREATE | O_RDWR);
+  write(fd1, "yyy", 3);
+  close(fd1);
+
+  if(read(fd, buf, sizeof(buf)) != 5){
+    printf(1, "unlinkread read failed");
+    exit();
+  }
+  if(buf[0] != 'h'){
+    printf(1, "unlinkread wrong data\n");
+    exit();
+  }
+  if(write(fd, buf, 10) != 10){
+    printf(1, "unlinkread write failed\n");
+    exit();
+  }
+  close(fd);
+  unlink("unlinkread");
+  printf(1, "unlinkread ok\n");
+}
+
+void
+linktest(void)
+{
+  int fd;
+
+  printf(1, "linktest\n");
+
+  unlink("lf1");
+  unlink("lf2");
+
+  fd = open("lf1", O_CREATE|O_RDWR);
+  if(fd < 0){
+    printf(1, "create lf1 failed\n");
+    exit();
+  }
+  if(write(fd, "hello", 5) != 5){
+    printf(1, "write lf1 failed\n");
+    exit();
+  }
+  close(fd);
+
+  if(link("lf1", "lf2") < 0){
+    printf(1, "link lf1 lf2 failed\n");
+    exit();
+  }
+  unlink("lf1");
+
+  if(open("lf1", 0) >= 0){
+    printf(1, "unlinked lf1 but it is still there!\n");
+    exit();
+  }
+
+  fd = open("lf2", 0);
+  if(fd < 0){
+    printf(1, "open lf2 failed\n");
+    exit();
+  }
+  if(read(fd, buf, sizeof(buf)) != 5){
+    printf(1, "read lf2 failed\n");
+    exit();
+  }
+  close(fd);
+
+  if(link("lf2", "lf2") >= 0){
+    printf(1, "link lf2 lf2 succeeded! oops\n");
+    exit();
+  }
+
+  unlink("lf2");
+  if(link("lf2", "lf1") >= 0){
+    printf(1, "link non-existant succeeded! oops\n");
+    exit();
+  }
+
+  if(link(".", "lf1") >= 0){
+    printf(1, "link . lf1 succeeded! oops\n");
+    exit();
+  }
+
+  printf(1, "linktest ok\n");
+}
+
+// test concurrent create/link/unlink of the same file
+void
+concreate(void)
+{
+  char file[3];
+  int i, pid, n, fd;
+  char fa[40];
+  struct {
+    ushort inum;
+    char name[14];
+  } de;
+
+  printf(1, "concreate test\n");
+  file[0] = 'C';
+  file[2] = '\0';
+  for(i = 0; i < 40; i++){
+    file[1] = '0' + i;
+    unlink(file);
+    pid = fork();
+    if(pid && (i % 3) == 1){
+      link("C0", file);
+    } else if(pid == 0 && (i % 5) == 1){
+      link("C0", file);
+    } else {
+      fd = open(file, O_CREATE | O_RDWR);
+      if(fd < 0){
+        printf(1, "concreate create %s failed\n", file);
+        exit();
+      }
+      close(fd);
+    }
+    if(pid == 0)
+      exit();
+    else
+      wait();
+  }
+
+  memset(fa, 0, sizeof(fa));
+  fd = open(".", 0);
+  n = 0;
+  while(read(fd, &de, sizeof(de)) > 0){
+    if(de.inum == 0)
+      continue;
+    if(de.name[0] == 'C' && de.name[2] == '\0'){
+      i = de.name[1] - '0';
+      if(i < 0 || i >= sizeof(fa)){
+        printf(1, "concreate weird file %s\n", de.name);
+        exit();
+      }
+      if(fa[i]){
+        printf(1, "concreate duplicate file %s\n", de.name);
+        exit();
+      }
+      fa[i] = 1;
+      n++;
+    }
+  }
+  close(fd);
+
+  if(n != 40){
+    printf(1, "concreate not enough files in directory listing\n");
+    exit();
+  }
+
+  for(i = 0; i < 40; i++){
+    file[1] = '0' + i;
+    pid = fork();
+    if(pid < 0){
+      printf(1, "fork failed\n");
+      exit();
+    }
+    if(((i % 3) == 0 && pid == 0) ||
+       ((i % 3) == 1 && pid != 0)){
+      close(open(file, 0));
+      close(open(file, 0));
+      close(open(file, 0));
+      close(open(file, 0));
+    } else {
+      unlink(file);
+      unlink(file);
+      unlink(file);
+      unlink(file);
+    }
+    if(pid == 0)
+      exit();
+    else
+      wait();
+  }
+
+  printf(1, "concreate ok\n");
+}
+
+// another concurrent link/unlink/create test,
+// to look for deadlocks.
+void
+linkunlink()
+{
+  int pid, i;
+
+  printf(1, "linkunlink test\n");
+
+  unlink("x");
+  pid = fork();
+  if(pid < 0){
+    printf(1, "fork failed\n");
+    exit();
+  }
+
+  unsigned int x = (pid ? 1 : 97);
+  for(i = 0; i < 100; i++){
+    x = x * 1103515245 + 12345;
+    if((x % 3) == 0){
+      close(open("x", O_RDWR | O_CREATE));
+    } else if((x % 3) == 1){
+      link("cat", "x");
+    } else {
+      unlink("x");
+    }
+  }
+
+  if(pid)
+    wait();
+  else
+    exit();
+
+  printf(1, "linkunlink ok\n");
+}
+
+// directory that uses indirect blocks
+void
+bigdir(void)
+{
+  int i, fd;
+  char name[10];
+
+  printf(1, "bigdir test\n");
+  unlink("bd");
+
+  fd = open("bd", O_CREATE);
+  if(fd < 0){
+    printf(1, "bigdir create failed\n");
+    exit();
+  }
+  close(fd);
+
+  for(i = 0; i < 500; i++){
+    name[0] = 'x';
+    name[1] = '0' + (i / 64);
+    name[2] = '0' + (i % 64);
+    name[3] = '\0';
+    if(link("bd", name) != 0){
+      printf(1, "bigdir link failed\n");
+      exit();
+    }
+  }
+
+  unlink("bd");
+  for(i = 0; i < 500; i++){
+    name[0] = 'x';
+    name[1] = '0' + (i / 64);
+    name[2] = '0' + (i % 64);
+    name[3] = '\0';
+    if(unlink(name) != 0){
+      printf(1, "bigdir unlink failed");
+      exit();
+    }
+  }
+
+  printf(1, "bigdir ok\n");
+}
+
+void
+subdir(void)
+{
+  int fd, cc;
+
+  printf(1, "subdir test\n");
+
+  unlink("ff");
+  if(mkdir("dd") != 0){
+    printf(1, "subdir mkdir dd failed\n");
+    exit();
+  }
+
+  fd = open("dd/ff", O_CREATE | O_RDWR);
+  if(fd < 0){
+    printf(1, "create dd/ff failed\n");
+    exit();
+  }
+  write(fd, "ff", 2);
+  close(fd);
+
+  if(unlink("dd") >= 0){
+    printf(1, "unlink dd (non-empty dir) succeeded!\n");
+    exit();
+  }
+
+  if(mkdir("/dd/dd") != 0){
+    printf(1, "subdir mkdir dd/dd failed\n");
+    exit();
+  }
+
+  fd = open("dd/dd/ff", O_CREATE | O_RDWR);
+  if(fd < 0){
+    printf(1, "create dd/dd/ff failed\n");
+    exit();
+  }
+  write(fd, "FF", 2);
+  close(fd);
+
+  fd = open("dd/dd/../ff", 0);
+  if(fd < 0){
+    printf(1, "open dd/dd/../ff failed\n");
+    exit();
+  }
+  cc = read(fd, buf, sizeof(buf));
+  if(cc != 2 || buf[0] != 'f'){
+    printf(1, "dd/dd/../ff wrong content\n");
+    exit();
+  }
+  close(fd);
+
+  if(link("dd/dd/ff", "dd/dd/ffff") != 0){
+    printf(1, "link dd/dd/ff dd/dd/ffff failed\n");
+    exit();
+  }
+
+  if(unlink("dd/dd/ff") != 0){
+    printf(1, "unlink dd/dd/ff failed\n");
+    exit();
+  }
+  if(open("dd/dd/ff", O_RDONLY) >= 0){
+    printf(1, "open (unlinked) dd/dd/ff succeeded\n");
+    exit();
+  }
+
+  if(chdir("dd") != 0){
+    printf(1, "chdir dd failed\n");
+    exit();
+  }
+  if(chdir("dd/../../dd") != 0){
+    printf(1, "chdir dd/../../dd failed\n");
+    exit();
+  }
+  if(chdir("dd/../../../dd") != 0){
+    printf(1, "chdir dd/../../dd failed\n");
+    exit();
+  }
+  if(chdir("./..") != 0){
+    printf(1, "chdir ./.. failed\n");
+    exit();
+  }
+
+  fd = open("dd/dd/ffff", 0);
+  if(fd < 0){
+    printf(1, "open dd/dd/ffff failed\n");
+    exit();
+  }
+  if(read(fd, buf, sizeof(buf)) != 2){
+    printf(1, "read dd/dd/ffff wrong len\n");
+    exit();
+  }
+  close(fd);
+
+  if(open("dd/dd/ff", O_RDONLY) >= 0){
+    printf(1, "open (unlinked) dd/dd/ff succeeded!\n");
+    exit();
+  }
+
+  if(open("dd/ff/ff", O_CREATE|O_RDWR) >= 0){
+    printf(1, "create dd/ff/ff succeeded!\n");
+    exit();
+  }
+  if(open("dd/xx/ff", O_CREATE|O_RDWR) >= 0){
+    printf(1, "create dd/xx/ff succeeded!\n");
+    exit();
+  }
+  if(open("dd", O_CREATE) >= 0){
+    printf(1, "create dd succeeded!\n");
+    exit();
+  }
+  if(open("dd", O_RDWR) >= 0){
+    printf(1, "open dd rdwr succeeded!\n");
+    exit();
+  }
+  if(open("dd", O_WRONLY) >= 0){
+    printf(1, "open dd wronly succeeded!\n");
+    exit();
+  }
+  if(link("dd/ff/ff", "dd/dd/xx") == 0){
+    printf(1, "link dd/ff/ff dd/dd/xx succeeded!\n");
+    exit();
+  }
+  if(link("dd/xx/ff", "dd/dd/xx") == 0){
+    printf(1, "link dd/xx/ff dd/dd/xx succeeded!\n");
+    exit();
+  }
+  if(link("dd/ff", "dd/dd/ffff") == 0){
+    printf(1, "link dd/ff dd/dd/ffff succeeded!\n");
+    exit();
+  }
+  if(mkdir("dd/ff/ff") == 0){
+    printf(1, "mkdir dd/ff/ff succeeded!\n");
+    exit();
+  }
+  if(mkdir("dd/xx/ff") == 0){
+    printf(1, "mkdir dd/xx/ff succeeded!\n");
+    exit();
+  }
+  if(mkdir("dd/dd/ffff") == 0){
+    printf(1, "mkdir dd/dd/ffff succeeded!\n");
+    exit();
+  }
+  if(unlink("dd/xx/ff") == 0){
+    printf(1, "unlink dd/xx/ff succeeded!\n");
+    exit();
+  }
+  if(unlink("dd/ff/ff") == 0){
+    printf(1, "unlink dd/ff/ff succeeded!\n");
+    exit();
+  }
+  if(chdir("dd/ff") == 0){
+    printf(1, "chdir dd/ff succeeded!\n");
+    exit();
+  }
+  if(chdir("dd/xx") == 0){
+    printf(1, "chdir dd/xx succeeded!\n");
+    exit();
+  }
+
+  if(unlink("dd/dd/ffff") != 0){
+    printf(1, "unlink dd/dd/ff failed\n");
+    exit();
+  }
+  if(unlink("dd/ff") != 0){
+    printf(1, "unlink dd/ff failed\n");
+    exit();
+  }
+  if(unlink("dd") == 0){
+    printf(1, "unlink non-empty dd succeeded!\n");
+    exit();
+  }
+  if(unlink("dd/dd") < 0){
+    printf(1, "unlink dd/dd failed\n");
+    exit();
+  }
+  if(unlink("dd") < 0){
+    printf(1, "unlink dd failed\n");
+    exit();
+  }
+
+  printf(1, "subdir ok\n");
+}
+
+// test writes that are larger than the log.
+void
+bigwrite(void)
+{
+  int fd, sz;
+
+  printf(1, "bigwrite test\n");
+
+  unlink("bigwrite");
+  for(sz = 499; sz < 12*512; sz += 471){
+    fd = open("bigwrite", O_CREATE | O_RDWR);
+    if(fd < 0){
+      printf(1, "cannot create bigwrite\n");
+      exit();
+    }
+    int i;
+    for(i = 0; i < 2; i++){
+      int cc = write(fd, buf, sz);
+      if(cc != sz){
+        printf(1, "write(%d) ret %d\n", sz, cc);
+        exit();
+      }
+    }
+    close(fd);
+    unlink("bigwrite");
+  }
+
+  printf(1, "bigwrite ok\n");
+}
+
+void
+bigfile(void)
+{
+  int fd, i, total, cc;
+
+  printf(1, "bigfile test\n");
+
+  unlink("bigfile");
+  fd = open("bigfile", O_CREATE | O_RDWR);
+  if(fd < 0){
+    printf(1, "cannot create bigfile");
+    exit();
+  }
+  for(i = 0; i < 20; i++){
+    memset(buf, i, 600);
+    if(write(fd, buf, 600) != 600){
+      printf(1, "write bigfile failed\n");
+      exit();
+    }
+  }
+  close(fd);
+
+  fd = open("bigfile", 0);
+  if(fd < 0){
+    printf(1, "cannot open bigfile\n");
+    exit();
+  }
+  total = 0;
+  for(i = 0; ; i++){
+    cc = read(fd, buf, 300);
+    if(cc < 0){
+      printf(1, "read bigfile failed\n");
+      exit();
+    }
+    if(cc == 0)
+      break;
+    if(cc != 300){
+      printf(1, "short read bigfile\n");
+      exit();
+    }
+    if(buf[0] != i/2 || buf[299] != i/2){
+      printf(1, "read bigfile wrong data\n");
+      exit();
+    }
+    total += cc;
+  }
+  close(fd);
+  if(total != 20*600){
+    printf(1, "read bigfile wrong total\n");
+    exit();
+  }
+  unlink("bigfile");
+
+  printf(1, "bigfile test ok\n");
+}
+
+void
+fourteen(void)
+{
+  int fd;
+
+  // DIRSIZ is 14.
+  printf(1, "fourteen test\n");
+
+  if(mkdir("12345678901234") != 0){
+    printf(1, "mkdir 12345678901234 failed\n");
+    exit();
+  }
+  if(mkdir("12345678901234/123456789012345") != 0){
+    printf(1, "mkdir 12345678901234/123456789012345 failed\n");
+    exit();
+  }
+  fd = open("123456789012345/123456789012345/123456789012345", O_CREATE);
+  if(fd < 0){
+    printf(1, "create 123456789012345/123456789012345/123456789012345 failed\n");
+    exit();
+  }
+  close(fd);
+  fd = open("12345678901234/12345678901234/12345678901234", 0);
+  if(fd < 0){
+    printf(1, "open 12345678901234/12345678901234/12345678901234 failed\n");
+    exit();
+  }
+  close(fd);
+
+  if(mkdir("12345678901234/12345678901234") == 0){
+    printf(1, "mkdir 12345678901234/12345678901234 succeeded!\n");
+    exit();
+  }
+  if(mkdir("123456789012345/12345678901234") == 0){
+    printf(1, "mkdir 12345678901234/123456789012345 succeeded!\n");
+    exit();
+  }
+
+  printf(1, "fourteen ok\n");
+}
+
+void
+rmdot(void)
+{
+  printf(1, "rmdot test\n");
+  if(mkdir("dots") != 0){
+    printf(1, "mkdir dots failed\n");
+    exit();
+  }
+  if(chdir("dots") != 0){
+    printf(1, "chdir dots failed\n");
+    exit();
+  }
+  if(unlink(".") == 0){
+    printf(1, "rm . worked!\n");
+    exit();
+  }
+  if(unlink("..") == 0){
+    printf(1, "rm .. worked!\n");
+    exit();
+  }
+  if(chdir("/") != 0){
+    printf(1, "chdir / failed\n");
+    exit();
+  }
+  if(unlink("dots/.") == 0){
+    printf(1, "unlink dots/. worked!\n");
+    exit();
+  }
+  if(unlink("dots/..") == 0){
+    printf(1, "unlink dots/.. worked!\n");
+    exit();
+  }
+  if(unlink("dots") != 0){
+    printf(1, "unlink dots failed!\n");
+    exit();
+  }
+  printf(1, "rmdot ok\n");
+}
+
+void
+dirfile(void)
+{
+  int fd;
+
+  printf(1, "dir vs file\n");
+
+  fd = open("dirfile", O_CREATE);
+  if(fd < 0){
+    printf(1, "create dirfile failed\n");
+    exit();
+  }
+  close(fd);
+  if(chdir("dirfile") == 0){
+    printf(1, "chdir dirfile succeeded!\n");
+    exit();
+  }
+  fd = open("dirfile/xx", 0);
+  if(fd >= 0){
+    printf(1, "create dirfile/xx succeeded!\n");
+    exit();
+  }
+  fd = open("dirfile/xx", O_CREATE);
+  if(fd >= 0){
+    printf(1, "create dirfile/xx succeeded!\n");
+    exit();
+  }
+  if(mkdir("dirfile/xx") == 0){
+    printf(1, "mkdir dirfile/xx succeeded!\n");
+    exit();
+  }
+  if(unlink("dirfile/xx") == 0){
+    printf(1, "unlink dirfile/xx succeeded!\n");
+    exit();
+  }
+  if(link("README", "dirfile/xx") == 0){
+    printf(1, "link to dirfile/xx succeeded!\n");
+    exit();
+  }
+  if(unlink("dirfile") != 0){
+    printf(1, "unlink dirfile failed!\n");
+    exit();
+  }
+
+  fd = open(".", O_RDWR);
+  if(fd >= 0){
+    printf(1, "open . for writing succeeded!\n");
+    exit();
+  }
+  fd = open(".", 0);
+  if(write(fd, "x", 1) > 0){
+    printf(1, "write . succeeded!\n");
+    exit();
+  }
+  close(fd);
+
+  printf(1, "dir vs file OK\n");
+}
+
+// test that iput() is called at the end of _namei()
+void
+iref(void)
+{
+  int i, fd;
+
+  printf(1, "empty file name\n");
+
+  // the 50 is NINODE
+  for(i = 0; i < 50 + 1; i++){
+    if(mkdir("irefd") != 0){
+      printf(1, "mkdir irefd failed\n");
+      exit();
+    }
+    if(chdir("irefd") != 0){
+      printf(1, "chdir irefd failed\n");
+      exit();
+    }
+
+    mkdir("");
+    link("README", "");
+    fd = open("", O_CREATE);
+    if(fd >= 0)
+      close(fd);
+    fd = open("xx", O_CREATE);
+    if(fd >= 0)
+      close(fd);
+    unlink("xx");
+  }
+
+  chdir("/");
+  printf(1, "empty file name OK\n");
+}
+
+// test that fork fails gracefully
+// the forktest binary also does this, but it runs out of proc entries first.
+// inside the bigger usertests binary, we run out of memory first.
+void
+forktest(void)
+{
+  int n, pid;
+
+  printf(1, "fork test\n");
+
+  for(n=0; n<1000; n++){
+    pid = fork();
+    if(pid < 0)
+      break;
+    if(pid == 0)
+      exit();
+  }
+
+  if(n == 1000){
+    printf(1, "fork claimed to work 1000 times!\n");
+    exit();
+  }
+
+  for(; n > 0; n--){
+    if(wait() < 0){
+      printf(1, "wait stopped early\n");
+      exit();
+    }
+  }
+
+  if(wait() != -1){
+    printf(1, "wait got too many\n");
+    exit();
+  }
+
+  printf(1, "fork test OK\n");
+}
+
+void
+sbrktest(void)
+{
+  int fds[2], pid, pids[10], ppid;
+  char *a, *b, *c, *lastaddr, *oldbrk, *p, scratch;
+  uint amt;
+
+  printf(stdout, "sbrk test\n");
+  oldbrk = sbrk(0);
+
+  // can one sbrk() less than a page?
+  a = sbrk(0);
+  int i;
+  for(i = 0; i < 5000; i++){
+    b = sbrk(1);
+    if(b != a){
+      printf(stdout, "sbrk test failed %d %x %x\n", i, a, b);
+      exit();
+    }
+    *b = 1;
+    a = b + 1;
+  }
+  pid = fork();
+  if(pid < 0){
+    printf(stdout, "sbrk test fork failed\n");
+    exit();
+  }
+  c = sbrk(1);
+  c = sbrk(1);
+  if(c != a + 1){
+    printf(stdout, "sbrk test failed post-fork\n");
+    exit();
+  }
+  if(pid == 0)
+    exit();
+  wait();
+
+  // can one grow address space to something big?
+#define BIG (100*1024*1024)
+  a = sbrk(0);
+  amt = (BIG) - (uint)a;
+  p = sbrk(amt);
+  if (p != a) {
+    printf(stdout, "sbrk test failed to grow big address space; enough phys mem?\n");
+    exit();
+  }
+  lastaddr = (char*) (BIG-1);
+  *lastaddr = 99;
+
+  // can one de-allocate?
+  a = sbrk(0);
+  c = sbrk(-4096);
+  if(c == (char*)0xffffffff){
+    printf(stdout, "sbrk could not deallocate\n");
+    exit();
+  }
+  c = sbrk(0);
+  if(c != a - 4096){
+    printf(stdout, "sbrk deallocation produced wrong address, a %x c %x\n", a, c);
+    exit();
+  }
+
+  // can one re-allocate that page?
+  a = sbrk(0);
+  c = sbrk(4096);
+  if(c != a || sbrk(0) != a + 4096){
+    printf(stdout, "sbrk re-allocation failed, a %x c %x\n", a, c);
+    exit();
+  }
+  if(*lastaddr == 99){
+    // should be zero
+    printf(stdout, "sbrk de-allocation didn't really deallocate\n");
+    exit();
+  }
+
+  a = sbrk(0);
+  c = sbrk(-(sbrk(0) - oldbrk));
+  if(c != a){
+    printf(stdout, "sbrk downsize failed, a %x c %x\n", a, c);
+    exit();
+  }
+
+  // can we read the kernel's memory?
+  for(a = (char*)(KERNBASE); a < (char*) (KERNBASE+2000000); a += 50000){
+    ppid = getpid();
+    pid = fork();
+    if(pid < 0){
+      printf(stdout, "fork failed\n");
+      exit();
+    }
+    if(pid == 0){
+      printf(stdout, "oops could read %x = %x\n", a, *a);
+      kill(ppid);
+      exit();
+    }
+    wait();
+  }
+
+  // if we run the system out of memory, does it clean up the last
+  // failed allocation?
+  if(pipe(fds) != 0){
+    printf(1, "pipe() failed\n");
+    exit();
+  }
+  for(i = 0; i < sizeof(pids)/sizeof(pids[0]); i++){
+    if((pids[i] = fork()) == 0){
+      // allocate a lot of memory
+      sbrk(BIG - (uint)sbrk(0));
+      write(fds[1], "x", 1);
+      // sit around until killed
+      for(;;) sleep(1000);
+    }
+    if(pids[i] != -1)
+      read(fds[0], &scratch, 1);
+  }
+  // if those failed allocations freed up the pages they did allocate,
+  // we'll be able to allocate here
+  c = sbrk(4096);
+  for(i = 0; i < sizeof(pids)/sizeof(pids[0]); i++){
+    if(pids[i] == -1)
+      continue;
+    kill(pids[i]);
+    wait();
+  }
+  if(c == (char*)0xffffffff){
+    printf(stdout, "failed sbrk leaked memory\n");
+    exit();
+  }
+
+  if(sbrk(0) > oldbrk)
+    sbrk(-(sbrk(0) - oldbrk));
+
+  printf(stdout, "sbrk test OK\n");
+}
+
+void
+validateint(int *p)
+{
+  int res;
+  asm("mov %%esp, %%ebx\n\t"
+      "mov %3, %%esp\n\t"
+      "int %2\n\t"
+      "mov %%ebx, %%esp" :
+      "=a" (res) :
+      "a" (SYS_sleep), "n" (T_SYSCALL), "c" (p) :
+      "ebx");
+}
+
+void
+validatetest(void)
+{
+  int hi, pid;
+  uint p;
+
+  printf(stdout, "validate test\n");
+  hi = 1100*1024;
+
+  for(p = 0; p <= (uint)hi; p += 4096){
+    if((pid = fork()) == 0){
+      // try to crash the kernel by passing in a badly placed integer
+      validateint((int*)p);
+      exit();
+    }
+    sleep(0);
+    sleep(0);
+    kill(pid);
+    wait();
+
+    // try to crash the kernel by passing in a bad string pointer
+    if(link("nosuchfile", (char*)p) != -1){
+      printf(stdout, "link should not succeed\n");
+      exit();
+    }
+  }
+
+  printf(stdout, "validate ok\n");
+}
+
+// does unintialized data start out zero?
+char uninit[10000];
+void
+bsstest(void)
+{
+  int i;
+
+  printf(stdout, "bss test\n");
+  for(i = 0; i < sizeof(uninit); i++){
+    if(uninit[i] != '\0'){
+      printf(stdout, "bss test failed\n");
+      exit();
+    }
+  }
+  printf(stdout, "bss test ok\n");
+}
+
+// does exec return an error if the arguments
+// are larger than a page? or does it write
+// below the stack and wreck the instructions/data?
+void
+bigargtest(void)
+{
+  int pid, fd;
+
+  unlink("bigarg-ok");
+  pid = fork();
+  if(pid == 0){
+    static char *args[MAXARG];
+    int i;
+    for(i = 0; i < MAXARG-1; i++)
+      args[i] = "bigargs test: failed\n                                                                                                                                                                                                       ";
+    args[MAXARG-1] = 0;
+    printf(stdout, "bigarg test\n");
+    exec("echo", args);
+    printf(stdout, "bigarg test ok\n");
+    fd = open("bigarg-ok", O_CREATE);
+    close(fd);
+    exit();
+  } else if(pid < 0){
+    printf(stdout, "bigargtest: fork failed\n");
+    exit();
+  }
+  wait();
+  fd = open("bigarg-ok", 0);
+  if(fd < 0){
+    printf(stdout, "bigarg test failed!\n");
+    exit();
+  }
+  close(fd);
+  unlink("bigarg-ok");
+}
+
+// what happens when the file system runs out of blocks?
+// answer: balloc panics, so this test is not useful.
+void
+fsfull()
+{
+  int nfiles;
+  int fsblocks = 0;
+
+  printf(1, "fsfull test\n");
+
+  for(nfiles = 0; ; nfiles++){
+    char name[64];
+    name[0] = 'f';
+    name[1] = '0' + nfiles / 1000;
+    name[2] = '0' + (nfiles % 1000) / 100;
+    name[3] = '0' + (nfiles % 100) / 10;
+    name[4] = '0' + (nfiles % 10);
+    name[5] = '\0';
+    printf(1, "writing %s\n", name);
+    int fd = open(name, O_CREATE|O_RDWR);
+    if(fd < 0){
+      printf(1, "open %s failed\n", name);
+      break;
+    }
+    int total = 0;
+    while(1){
+      int cc = write(fd, buf, 512);
+      if(cc < 512)
+        break;
+      total += cc;
+      fsblocks++;
+    }
+    printf(1, "wrote %d bytes\n", total);
+    close(fd);
+    if(total == 0)
+      break;
+  }
+
+  while(nfiles >= 0){
+    char name[64];
+    name[0] = 'f';
+    name[1] = '0' + nfiles / 1000;
+    name[2] = '0' + (nfiles % 1000) / 100;
+    name[3] = '0' + (nfiles % 100) / 10;
+    name[4] = '0' + (nfiles % 10);
+    name[5] = '\0';
+    unlink(name);
+    nfiles--;
+  }
+
+  printf(1, "fsfull test finished\n");
+}
+
+void
+uio()
+{
+  #define RTC_ADDR 0x70
+  #define RTC_DATA 0x71
+
+  ushort port = 0;
+  uchar val = 0;
+  int pid;
+
+  printf(1, "uio test\n");
+  pid = fork();
+  if(pid == 0){
+    port = RTC_ADDR;
+    val = 0x09;  /* year */
+    /* http://wiki.osdev.org/Inline_Assembly/Examples */
+    asm volatile("outb %0,%1"::"a"(val), "d" (port));
+    port = RTC_DATA;
+    asm volatile("inb %1,%0" : "=a" (val) : "d" (port));
+    printf(1, "uio: uio succeeded; test FAILED\n");
+    exit();
+  } else if(pid < 0){
+    printf (1, "fork failed\n");
+    exit();
+  }
+  wait();
+  printf(1, "uio test done\n");
+}
+
+void argptest()
+{
+  int fd;
+  fd = open("init", O_RDONLY);
+  if (fd < 0) {
+    printf(2, "open failed\n");
+    exit();
+  }
+  read(fd, sbrk(0) - 1, -1);
+  close(fd);
+  printf(1, "arg test passed\n");
+}
+
+unsigned long randstate = 1;
+unsigned int
+rand()
+{
+  randstate = randstate * 1664525 + 1013904223;
+  return randstate;
+}
+
+int
+main(int argc, char *argv[])
+{
+  printf(1, "usertests starting\n");
+
+  if(open("usertests.ran", 0) >= 0){
+    printf(1, "already ran user tests -- rebuild fs.img\n");
+    exit();
+  }
+  close(open("usertests.ran", O_CREATE));
+
+  argptest();
+  createdelete();
+  linkunlink();
+  concreate();
+  fourfiles();
+  sharedfd();
+
+  bigargtest();
+  bigwrite();
+  bigargtest();
+  bsstest();
+  sbrktest();
+  validatetest();
+
+  opentest();
+  writetest();
+  writetest1();
+  createtest();
+
+  openiputtest();
+  exitiputtest();
+  iputtest();
+
+  mem();
+  pipe1();
+  preempt();
+  exitwait();
+
+  rmdot();
+  fourteen();
+  bigfile();
+  subdir();
+  linktest();
+  unlinkread();
+  dirfile();
+  iref();
+  forktest();
+  bigdir(); // slow
+
+  uio();
+
+  exectest();
+
+  exit();
+}
diff --git a/xv6-public/usys.S b/xv6-public/usys.S
new file mode 100644
index 0000000..a7b25ca
--- /dev/null
+++ b/xv6-public/usys.S
@@ -0,0 +1,41 @@
+#include "syscall.h"
+#include "traps.h"
+
+#define SYSCALL(name) \
+  .globl name; \
+  name: \
+    movl $SYS_ ## name, %eax; \
+    int $T_SYSCALL; \
+    ret
+
+/*
+ * 什么时候执行这段？
+ * 应该系统启动过程就会执行，注册一个函数！
+ * 当调用name()时，自动进入这个函数，再转向sys_name()函数
+*/
+
+SYSCALL(fork)
+SYSCALL(exit)
+SYSCALL(wait)
+SYSCALL(pipe)
+SYSCALL(read)
+SYSCALL(write)
+SYSCALL(close)
+SYSCALL(kill)
+SYSCALL(exec)
+SYSCALL(open)
+SYSCALL(mknod)
+SYSCALL(unlink)
+SYSCALL(fstat)
+SYSCALL(link)
+SYSCALL(mkdir)
+SYSCALL(chdir)
+SYSCALL(dup)
+SYSCALL(dup2)
+SYSCALL(getpid)
+SYSCALL(sbrk)
+SYSCALL(sleep)
+SYSCALL(uptime)
+SYSCALL(date)
+SYSCALL(alarm)
+
diff --git a/xv6-public/uthread.c b/xv6-public/uthread.c
new file mode 100644
index 0000000..66fc1f8
--- /dev/null
+++ b/xv6-public/uthread.c
@@ -0,0 +1,114 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+/* Possible states of a thread; */
+#define FREE        0x0
+#define RUNNING     0x1
+#define RUNNABLE    0x2
+
+#define STACK_SIZE  8192
+#define MAX_THREAD  4
+
+typedef struct thread thread_t, *thread_p;
+typedef struct mutex mutex_t, *mutex_p;
+
+struct thread {
+  int        sp;                /* saved stack pointer */
+  char stack[STACK_SIZE];       /* the thread's stack */
+  int        state;             /* FREE, RUNNING, RUNNABLE */
+};
+static thread_t all_thread[MAX_THREAD];
+thread_p  current_thread;
+thread_p  next_thread;
+extern void thread_switch(void);
+
+void 
+thread_init(void)
+{
+  // main() is thread 0, which will make the first invocation to
+  // thread_schedule().  it needs a stack so that the first thread_switch() can
+  // save thread 0's state.  thread_schedule() won't run the main thread ever
+  // again, because its state is set to RUNNING, and thread_schedule() selects
+  // a RUNNABLE thread.
+  current_thread = &all_thread[0];
+  current_thread->state = RUNNING;
+}
+
+static void 
+thread_schedule(void)
+{
+  thread_p t;
+
+  /* Find another runnable thread. */
+  next_thread = 0;
+  for (t = all_thread; t < all_thread + MAX_THREAD; t++) {
+    if (t->state == RUNNABLE && t != current_thread) {
+      next_thread = t;
+      break;
+    }
+  }
+
+  if (t >= all_thread + MAX_THREAD && current_thread->state == RUNNABLE) {
+    /* The current thread is the only runnable thread; run it. */
+    next_thread = current_thread;
+  }
+
+  if (next_thread == 0) {
+    printf(2, "thread_schedule: no runnable threads\n");
+    exit();
+  }
+
+  if (current_thread != next_thread) {         /* switch threads?  */
+    next_thread->state = RUNNING;
+    thread_switch();
+  } else
+    next_thread = 0;
+}
+
+void 
+thread_create(void (*func)())
+{
+  thread_p t;
+
+  for (t = all_thread; t < all_thread + MAX_THREAD; t++) {
+    if (t->state == FREE) break;
+  }
+  t->sp = (int) (t->stack + STACK_SIZE);   // set sp to the top of the stack
+  t->sp -= 4;                              // space for return address
+  * (int *) (t->sp) = (int)func;           // push return address on stack
+  t->sp -= 32;                             // space for registers that thread_switch expects
+  t->state = RUNNABLE;
+}
+
+void 
+thread_yield(void)
+{
+  current_thread->state = RUNNABLE;
+  thread_schedule();
+}
+
+static void 
+mythread(void)
+{
+  int i;
+  printf(1, "my thread running\n");
+  for (i = 0; i < 100; i++) {
+    printf(1, "my thread 0x%x\n", (int) current_thread);
+    thread_yield();
+  }
+  printf(1, "my thread: exit\n");
+  current_thread->state = FREE;
+  thread_schedule();
+}
+
+
+int 
+main(int argc, char *argv[]) 
+{
+  thread_init();
+  thread_create(mythread);
+  thread_create(mythread);
+  thread_schedule();
+  return 0;
+}
diff --git a/xv6-public/uthread_switch.S b/xv6-public/uthread_switch.S
new file mode 100644
index 0000000..698b0cd
--- /dev/null
+++ b/xv6-public/uthread_switch.S
@@ -0,0 +1,28 @@
+	.text
+
+/* Switch from current_thread to next_thread. Make next_thread
+ * the current_thread, and set next_thread to 0.
+ * Use eax as a temporary register; it is caller saved.
+ */
+	.globl thread_switch
+thread_switch:
+	/* YOUR CODE HERE */
+	// C语言函数调用会压入 ip
+	pushal
+	// eax 指向 sp
+	movl current_thread, %eax
+	// save sp
+	movl %esp, (%eax)
+
+	
+	movl next_thread, %eax
+	movl %eax, current_thread
+	// restore sp
+	movl (%eax), %esp
+	
+	popal
+
+	movl $0x0, next_thread
+
+	// popal 后esp指向return address
+	ret				/* pop return address from stack */
diff --git a/xv6-public/vectors.pl b/xv6-public/vectors.pl
new file mode 100644
index 0000000..57b49dd
--- /dev/null
+++ b/xv6-public/vectors.pl
@@ -0,0 +1,47 @@
+#!/usr/bin/perl -w
+
+# Generate vectors.S, the trap/interrupt entry points.
+# There has to be one entry point per interrupt number
+# since otherwise there's no way for trap() to discover
+# the interrupt number.
+
+print "# generated by vectors.pl - do not edit\n";
+print "# handlers\n";
+print ".globl alltraps\n";
+for(my $i = 0; $i < 256; $i++){
+    print ".globl vector$i\n";
+    print "vector$i:\n";
+    if(!($i == 8 || ($i >= 10 && $i <= 14) || $i == 17)){
+        print "  pushl \$0\n";
+    }
+    print "  pushl \$$i\n";
+    print "  jmp alltraps\n";
+}
+
+print "\n# vector table\n";
+print ".data\n";
+print ".globl vectors\n";
+print "vectors:\n";
+for(my $i = 0; $i < 256; $i++){
+    print "  .long vector$i\n";
+}
+
+# sample output:
+#   # handlers
+#   .globl alltraps
+#   .globl vector0
+#   vector0:
+#     pushl $0
+#     pushl $0
+#     jmp alltraps
+#   ...
+#   
+#   # vector table
+#   .data
+#   .globl vectors
+#   vectors:
+#     .long vector0
+#     .long vector1
+#     .long vector2
+#   ...
+
diff --git a/xv6-public/vm.c b/xv6-public/vm.c
new file mode 100644
index 0000000..0275cec
--- /dev/null
+++ b/xv6-public/vm.c
@@ -0,0 +1,394 @@
+#include "param.h"
+#include "types.h"
+#include "defs.h"
+#include "x86.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "elf.h"
+
+extern char data[];  // defined by kernel.ld
+pde_t *kpgdir;  // for use in scheduler()
+
+// Set up CPU's kernel segment descriptors.
+// Run once on entry on each CPU.
+void
+seginit(void)
+{
+  struct cpu *c;
+
+  // Map "logical" addresses to virtual addresses using identity map.
+  // Cannot share a CODE descriptor for both kernel and user
+  // because it would have to have DPL_USR, but the CPU forbids
+  // an interrupt from CPL=0 to DPL=3.
+  c = &cpus[cpuid()];
+  c->gdt[SEG_KCODE] = SEG(STA_X|STA_R, 0, 0xffffffff, 0);
+  c->gdt[SEG_KDATA] = SEG(STA_W, 0, 0xffffffff, 0);
+  c->gdt[SEG_UCODE] = SEG(STA_X|STA_R, 0, 0xffffffff, DPL_USER);
+  c->gdt[SEG_UDATA] = SEG(STA_W, 0, 0xffffffff, DPL_USER);
+  lgdt(c->gdt, sizeof(c->gdt));
+}
+
+// Return the address of the PTE in page table pgdir
+// that corresponds to virtual address va.  If alloc!=0,
+// create any required page table pages.
+static pte_t *
+walkpgdir(pde_t *pgdir, const void *va, int alloc)
+{
+  pde_t *pde;
+  pte_t *pgtab;
+
+  pde = &pgdir[PDX(va)];
+  if(*pde & PTE_P){
+    pgtab = (pte_t*)P2V(PTE_ADDR(*pde));
+  } else {
+    if(!alloc || (pgtab = (pte_t*)kalloc()) == 0)
+      return 0;
+    // Make sure all those PTE_P bits are zero.
+    memset(pgtab, 0, PGSIZE);
+    // The permissions here are overly generous, but they can
+    // be further restricted by the permissions in the page table
+    // entries, if necessary.
+    *pde = V2P(pgtab) | PTE_P | PTE_W | PTE_U;
+  }
+  return &pgtab[PTX(va)];
+}
+
+// Create PTEs for virtual addresses starting at va that refer to
+// physical addresses starting at pa. va and size might not
+// be page-aligned.
+int
+mappages(pde_t *pgdir, void *va, uint size, uint pa, int perm)
+{
+  char *a, *last;
+  pte_t *pte;
+
+  a = (char*)PGROUNDDOWN((uint)va);
+  last = (char*)PGROUNDDOWN(((uint)va) + size - 1);
+  for(;;){
+    if((pte = walkpgdir(pgdir, a, 1)) == 0)
+      return -1;
+    if(*pte & PTE_P)
+      panic("remap");
+    *pte = pa | perm | PTE_P;
+    if(a == last)
+      break;
+    a += PGSIZE;
+    pa += PGSIZE;
+  }
+  return 0;
+}
+
+// There is one page table per process, plus one that's used when
+// a CPU is not running any process (kpgdir). The kernel uses the
+// current process's page table during system calls and interrupts;
+// page protection bits prevent user code from using the kernel's
+// mappings.
+//
+// setupkvm() and exec() set up every page table like this:
+//
+//   0..KERNBASE: user memory (text+data+stack+heap), mapped to
+//                phys memory allocated by the kernel
+//   KERNBASE..KERNBASE+EXTMEM: mapped to 0..EXTMEM (for I/O space)
+//   KERNBASE+EXTMEM..data: mapped to EXTMEM..V2P(data)
+//                for the kernel's instructions and r/o data
+//   data..KERNBASE+PHYSTOP: mapped to V2P(data)..PHYSTOP,
+//                                  rw data + free physical memory
+//   0xfe000000..0: mapped direct (devices such as ioapic)
+//
+// The kernel allocates physical memory for its heap and for user memory
+// between V2P(end) and the end of physical memory (PHYSTOP)
+// (directly addressable from end..P2V(PHYSTOP)).
+
+// This table defines the kernel's mappings, which are present in
+// every process's page table.
+static struct kmap {
+  void *virt;
+  uint phys_start;
+  uint phys_end;
+  int perm;
+} kmap[] = {
+ { (void*)KERNBASE, 0,             EXTMEM,    PTE_W}, // I/O space
+ { (void*)KERNLINK, V2P(KERNLINK), V2P(data), 0},     // kern text+rodata
+ { (void*)data,     V2P(data),     PHYSTOP,   PTE_W}, // kern data+memory
+ { (void*)DEVSPACE, DEVSPACE,      0,         PTE_W}, // more devices
+};
+
+// Set up kernel part of a page table.
+pde_t*
+setupkvm(void)
+{
+  pde_t *pgdir;
+  struct kmap *k;
+
+  if((pgdir = (pde_t*)kalloc()) == 0)
+    return 0;
+  memset(pgdir, 0, PGSIZE);
+  if (P2V(PHYSTOP) > (void*)DEVSPACE)
+    panic("PHYSTOP too high");
+  for(k = kmap; k < &kmap[NELEM(kmap)]; k++)
+    if(mappages(pgdir, k->virt, k->phys_end - k->phys_start,
+                (uint)k->phys_start, k->perm) < 0) {
+      freevm(pgdir);
+      return 0;
+    }
+  return pgdir;
+}
+
+// Allocate one page table for the machine for the kernel address
+// space for scheduler processes.
+void
+kvmalloc(void)
+{
+  kpgdir = setupkvm();
+  switchkvm();
+}
+
+// Switch h/w page table register to the kernel-only page table,
+// for when no process is running.
+void
+switchkvm(void)
+{
+  lcr3(V2P(kpgdir));   // switch to the kernel page table
+}
+
+// Switch TSS and h/w page table to correspond to process p.
+void
+switchuvm(struct proc *p)
+{
+  if(p == 0)
+    panic("switchuvm: no process");
+  if(p->kstack == 0)
+    panic("switchuvm: no kstack");
+  if(p->pgdir == 0)
+    panic("switchuvm: no pgdir");
+
+  pushcli();
+  mycpu()->gdt[SEG_TSS] = SEG16(STS_T32A, &mycpu()->ts,
+                                sizeof(mycpu()->ts)-1, 0);
+  mycpu()->gdt[SEG_TSS].s = 0;
+  mycpu()->ts.ss0 = SEG_KDATA << 3;
+  mycpu()->ts.esp0 = (uint)p->kstack + KSTACKSIZE;
+  // setting IOPL=0 in eflags *and* iomb beyond the tss segment limit
+  // forbids I/O instructions (e.g., inb and outb) from user space
+  mycpu()->ts.iomb = (ushort) 0xFFFF;
+  ltr(SEG_TSS << 3);
+  lcr3(V2P(p->pgdir));  // switch to process's address space
+  popcli();
+}
+
+// Load the initcode into address 0 of pgdir.
+// sz must be less than a page.
+void
+inituvm(pde_t *pgdir, char *init, uint sz)
+{
+  char *mem;
+
+  if(sz >= PGSIZE)
+    panic("inituvm: more than a page");
+  mem = kalloc();
+  memset(mem, 0, PGSIZE);
+  mappages(pgdir, 0, PGSIZE, V2P(mem), PTE_W|PTE_U);
+  memmove(mem, init, sz);
+}
+
+// Load a program segment into pgdir.  addr must be page-aligned
+// and the pages from addr to addr+sz must already be mapped.
+int
+loaduvm(pde_t *pgdir, char *addr, struct inode *ip, uint offset, uint sz)
+{
+  uint i, pa, n;
+  pte_t *pte;
+
+  if((uint) addr % PGSIZE != 0)
+    panic("loaduvm: addr must be page aligned");
+  for(i = 0; i < sz; i += PGSIZE){
+    if((pte = walkpgdir(pgdir, addr+i, 0)) == 0)
+      panic("loaduvm: address should exist");
+    pa = PTE_ADDR(*pte);
+    if(sz - i < PGSIZE)
+      n = sz - i;
+    else
+      n = PGSIZE;
+    if(readi(ip, P2V(pa), offset+i, n) != n)
+      return -1;
+  }
+  return 0;
+}
+
+// Allocate page tables and physical memory to grow process from oldsz to
+// newsz, which need not be page aligned.  Returns new size or 0 on error.
+int
+allocuvm(pde_t *pgdir, uint oldsz, uint newsz)
+{
+  char *mem;
+  uint a;
+
+  if(newsz >= KERNBASE)
+    return 0;
+  if(newsz < oldsz)
+    return oldsz;
+
+  a = PGROUNDUP(oldsz);
+  for(; a < newsz; a += PGSIZE){
+    mem = kalloc();
+    if(mem == 0){
+      cprintf("allocuvm out of memory\n");
+      deallocuvm(pgdir, newsz, oldsz);
+      return 0;
+    }
+    memset(mem, 0, PGSIZE);
+    if(mappages(pgdir, (char*)a, PGSIZE, V2P(mem), PTE_W|PTE_U) < 0){
+      cprintf("allocuvm out of memory (2)\n");
+      deallocuvm(pgdir, newsz, oldsz);
+      kfree(mem);
+      return 0;
+    }
+  }
+  return newsz;
+}
+
+// Deallocate user pages to bring the process size from oldsz to
+// newsz.  oldsz and newsz need not be page-aligned, nor does newsz
+// need to be less than oldsz.  oldsz can be larger than the actual
+// process size.  Returns the new process size.
+int
+deallocuvm(pde_t *pgdir, uint oldsz, uint newsz)
+{
+  pte_t *pte;
+  uint a, pa;
+
+  if(newsz >= oldsz)
+    return oldsz;
+
+  a = PGROUNDUP(newsz);
+  for(; a  < oldsz; a += PGSIZE){
+    pte = walkpgdir(pgdir, (char*)a, 0);
+    if(!pte)
+      a = PGADDR(PDX(a) + 1, 0, 0) - PGSIZE;
+    else if((*pte & PTE_P) != 0){
+      pa = PTE_ADDR(*pte);
+      if(pa == 0)
+        panic("kfree");
+      char *v = P2V(pa);
+      kfree(v);
+      *pte = 0;
+    }
+  }
+  return newsz;
+}
+
+// Free a page table and all the physical memory pages
+// in the user part.
+void
+freevm(pde_t *pgdir)
+{
+  uint i;
+
+  if(pgdir == 0)
+    panic("freevm: no pgdir");
+  deallocuvm(pgdir, KERNBASE, 0);
+  for(i = 0; i < NPDENTRIES; i++){
+    if(pgdir[i] & PTE_P){
+      char * v = P2V(PTE_ADDR(pgdir[i]));
+      kfree(v);
+    }
+  }
+  kfree((char*)pgdir);
+}
+
+// Clear PTE_U on a page. Used to create an inaccessible
+// page beneath the user stack.
+void
+clearpteu(pde_t *pgdir, char *uva)
+{
+  pte_t *pte;
+
+  pte = walkpgdir(pgdir, uva, 0);
+  if(pte == 0)
+    panic("clearpteu");
+  *pte &= ~PTE_U;
+}
+
+// Given a parent process's page table, create a copy
+// of it for a child.
+pde_t*
+copyuvm(pde_t *pgdir, uint sz)
+{
+  pde_t *d;
+  pte_t *pte;
+  uint pa, i, flags;
+  char *mem;
+
+  if((d = setupkvm()) == 0)
+    return 0;
+  for(i = 0; i < sz; i += PGSIZE){
+    if((pte = walkpgdir(pgdir, (void *) i, 0)) == 0)
+      panic("copyuvm: pte should exist");
+    if(!(*pte & PTE_P))
+      panic("copyuvm: page not present");
+    pa = PTE_ADDR(*pte);
+    flags = PTE_FLAGS(*pte);
+    if((mem = kalloc()) == 0)
+      goto bad;
+    memmove(mem, (char*)P2V(pa), PGSIZE);
+    if(mappages(d, (void*)i, PGSIZE, V2P(mem), flags) < 0) {
+      kfree(mem);
+      goto bad;
+    }
+  }
+  return d;
+
+bad:
+  freevm(d);
+  return 0;
+}
+
+//PAGEBREAK!
+// Map user virtual address to kernel address.
+char*
+uva2ka(pde_t *pgdir, char *uva)
+{
+  pte_t *pte;
+
+  pte = walkpgdir(pgdir, uva, 0);
+  if((*pte & PTE_P) == 0)
+    return 0;
+  if((*pte & PTE_U) == 0)
+    return 0;
+  return (char*)P2V(PTE_ADDR(*pte));
+}
+
+// Copy len bytes from p to user address va in page table pgdir.
+// Most useful when pgdir is not the current page table.
+// uva2ka ensures this only works for PTE_U pages.
+int
+copyout(pde_t *pgdir, uint va, void *p, uint len)
+{
+  char *buf, *pa0;
+  uint n, va0;
+
+  buf = (char*)p;
+  while(len > 0){
+    va0 = (uint)PGROUNDDOWN(va);
+    pa0 = uva2ka(pgdir, (char*)va0);
+    if(pa0 == 0)
+      return -1;
+    n = PGSIZE - (va - va0);
+    if(n > len)
+      n = len;
+    memmove(pa0 + (va - va0), buf, n);
+    len -= n;
+    buf += n;
+    va = va0 + PGSIZE;
+  }
+  return 0;
+}
+
+//PAGEBREAK!
+// Blank page.
+//PAGEBREAK!
+// Blank page.
+//PAGEBREAK!
+// Blank page.
+
diff --git a/xv6-public/wc.c b/xv6-public/wc.c
new file mode 100644
index 0000000..d6a54df
--- /dev/null
+++ b/xv6-public/wc.c
@@ -0,0 +1,54 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+char buf[512];
+
+void
+wc(int fd, char *name)
+{
+  int i, n;
+  int l, w, c, inword;
+
+  l = w = c = 0;
+  inword = 0;
+  while((n = read(fd, buf, sizeof(buf))) > 0){
+    for(i=0; i<n; i++){
+      c++;
+      if(buf[i] == '\n')
+        l++;
+      if(strchr(" \r\t\n\v", buf[i]))
+        inword = 0;
+      else if(!inword){
+        w++;
+        inword = 1;
+      }
+    }
+  }
+  if(n < 0){
+    printf(1, "wc: read error\n");
+    exit();
+  }
+  printf(1, "%d %d %d %s\n", l, w, c, name);
+}
+
+int
+main(int argc, char *argv[])
+{
+  int fd, i;
+
+  if(argc <= 1){
+    wc(0, "");
+    exit();
+  }
+
+  for(i = 1; i < argc; i++){
+    if((fd = open(argv[i], 0)) < 0){
+      printf(1, "wc: cannot open %s\n", argv[i]);
+      exit();
+    }
+    wc(fd, argv[i]);
+    close(fd);
+  }
+  exit();
+}
diff --git a/xv6-public/x86.h b/xv6-public/x86.h
new file mode 100644
index 0000000..07312a5
--- /dev/null
+++ b/xv6-public/x86.h
@@ -0,0 +1,183 @@
+// Routines to let C code use special x86 instructions.
+
+static inline uchar
+inb(ushort port)
+{
+  uchar data;
+
+  asm volatile("in %1,%0" : "=a" (data) : "d" (port));
+  return data;
+}
+
+static inline void
+insl(int port, void *addr, int cnt)
+{
+  asm volatile("cld; rep insl" :
+               "=D" (addr), "=c" (cnt) :
+               "d" (port), "0" (addr), "1" (cnt) :
+               "memory", "cc");
+}
+
+static inline void
+outb(ushort port, uchar data)
+{
+  asm volatile("out %0,%1" : : "a" (data), "d" (port));
+}
+
+static inline void
+outw(ushort port, ushort data)
+{
+  asm volatile("out %0,%1" : : "a" (data), "d" (port));
+}
+
+static inline void
+outsl(int port, const void *addr, int cnt)
+{
+  asm volatile("cld; rep outsl" :
+               "=S" (addr), "=c" (cnt) :
+               "d" (port), "0" (addr), "1" (cnt) :
+               "cc");
+}
+
+static inline void
+stosb(void *addr, int data, int cnt)
+{
+  asm volatile("cld; rep stosb" :
+               "=D" (addr), "=c" (cnt) :
+               "0" (addr), "1" (cnt), "a" (data) :
+               "memory", "cc");
+}
+
+static inline void
+stosl(void *addr, int data, int cnt)
+{
+  asm volatile("cld; rep stosl" :
+               "=D" (addr), "=c" (cnt) :
+               "0" (addr), "1" (cnt), "a" (data) :
+               "memory", "cc");
+}
+
+struct segdesc;
+
+static inline void
+lgdt(struct segdesc *p, int size)
+{
+  volatile ushort pd[3];
+
+  pd[0] = size-1;
+  pd[1] = (uint)p;
+  pd[2] = (uint)p >> 16;
+
+  asm volatile("lgdt (%0)" : : "r" (pd));
+}
+
+struct gatedesc;
+
+static inline void
+lidt(struct gatedesc *p, int size)
+{
+  volatile ushort pd[3];
+
+  pd[0] = size-1;
+  pd[1] = (uint)p;
+  pd[2] = (uint)p >> 16;
+
+  asm volatile("lidt (%0)" : : "r" (pd));
+}
+
+static inline void
+ltr(ushort sel)
+{
+  asm volatile("ltr %0" : : "r" (sel));
+}
+
+static inline uint
+readeflags(void)
+{
+  uint eflags;
+  asm volatile("pushfl; popl %0" : "=r" (eflags));
+  return eflags;
+}
+
+static inline void
+loadgs(ushort v)
+{
+  asm volatile("movw %0, %%gs" : : "r" (v));
+}
+
+static inline void
+cli(void)
+{
+  asm volatile("cli");
+}
+
+static inline void
+sti(void)
+{
+  asm volatile("sti");
+}
+
+static inline uint
+xchg(volatile uint *addr, uint newval)
+{
+  uint result;
+
+  // The + in "+m" denotes a read-modify-write operand.
+  asm volatile("lock; xchgl %0, %1" :
+               "+m" (*addr), "=a" (result) :
+               "1" (newval) :
+               "cc");
+  return result;
+}
+
+static inline uint
+rcr2(void)
+{
+  uint val;
+  asm volatile("movl %%cr2,%0" : "=r" (val));
+  return val;
+}
+
+static inline void
+lcr3(uint val)
+{
+  asm volatile("movl %0,%%cr3" : : "r" (val));
+}
+
+//PAGEBREAK: 36
+// Layout of the trap frame built on the stack by the
+// hardware and by trapasm.S, and passed to trap().
+struct trapframe {
+  // registers as pushed by pusha
+  uint edi;
+  uint esi;
+  uint ebp;
+  uint oesp;      // useless & ignored
+  uint ebx;
+  uint edx;
+  uint ecx;
+  uint eax;
+
+  // rest of trap frame
+  ushort gs;
+  ushort padding1;
+  ushort fs;
+  ushort padding2;
+  ushort es;
+  ushort padding3;
+  ushort ds;
+  ushort padding4;
+  uint trapno;
+
+  // below here defined by x86 hardware
+  uint err;
+  uint eip;
+  ushort cs;
+  ushort padding5;
+  uint eflags;
+
+  // below here only when crossing rings, such as from user to kernel
+  uint esp;
+  ushort ss;
+  ushort padding6;
+};
diff --git a/xv6-public/xv6.si4project/Backup/Makefile(2542) b/xv6-public/xv6.si4project/Backup/Makefile(2542)
new file mode 100644
index 0000000..9870287
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/Makefile(2542)
@@ -0,0 +1,291 @@
+OBJS = \
+	bio.o\
+	console.o\
+	exec.o\
+	file.o\
+	fs.o\
+	ide.o\
+	ioapic.o\
+	kalloc.o\
+	kbd.o\
+	lapic.o\
+	log.o\
+	main.o\
+	mp.o\
+	picirq.o\
+	pipe.o\
+	proc.o\
+	sleeplock.o\
+	spinlock.o\
+	string.o\
+	swtch.o\
+	syscall.o\
+	sysfile.o\
+	sysproc.o\
+	trapasm.o\
+	trap.o\
+	uart.o\
+	vectors.o\
+	vm.o\
+
+# Cross-compiling (e.g., on Mac OS X)
+# TOOLPREFIX = i386-jos-elf
+
+# Using native tools (e.g., on X86 Linux)
+#TOOLPREFIX = 
+
+# Try to infer the correct TOOLPREFIX if not set
+ifndef TOOLPREFIX
+TOOLPREFIX := $(shell if i386-jos-elf-objdump -i 2>&1 | grep '^elf32-i386$$' >/dev/null 2>&1; \
+	then echo 'i386-jos-elf-'; \
+	elif objdump -i 2>&1 | grep 'elf32-i386' >/dev/null 2>&1; \
+	then echo ''; \
+	else echo "***" 1>&2; \
+	echo "*** Error: Couldn't find an i386-*-elf version of GCC/binutils." 1>&2; \
+	echo "*** Is the directory with i386-jos-elf-gcc in your PATH?" 1>&2; \
+	echo "*** If your i386-*-elf toolchain is installed with a command" 1>&2; \
+	echo "*** prefix other than 'i386-jos-elf-', set your TOOLPREFIX" 1>&2; \
+	echo "*** environment variable to that prefix and run 'make' again." 1>&2; \
+	echo "*** To turn off this error, run 'gmake TOOLPREFIX= ...'." 1>&2; \
+	echo "***" 1>&2; exit 1; fi)
+endif
+
+# If the makefile can't find QEMU, specify its path here
+# QEMU = qemu-system-i386
+
+# Try to infer the correct QEMU
+ifndef QEMU
+QEMU = $(shell if which qemu > /dev/null; \
+	then echo qemu; exit; \
+	elif which qemu-system-i386 > /dev/null; \
+	then echo qemu-system-i386; exit; \
+	elif which qemu-system-x86_64 > /dev/null; \
+	then echo qemu-system-x86_64; exit; \
+	else \
+	qemu=/Applications/Q.app/Contents/MacOS/i386-softmmu.app/Contents/MacOS/i386-softmmu; \
+	if test -x $$qemu; then echo $$qemu; exit; fi; fi; \
+	echo "***" 1>&2; \
+	echo "*** Error: Couldn't find a working QEMU executable." 1>&2; \
+	echo "*** Is the directory containing the qemu binary in your PATH" 1>&2; \
+	echo "*** or have you tried setting the QEMU variable in Makefile?" 1>&2; \
+	echo "***" 1>&2; exit 1)
+endif
+
+CC = $(TOOLPREFIX)gcc
+AS = $(TOOLPREFIX)gas
+LD = $(TOOLPREFIX)ld
+OBJCOPY = $(TOOLPREFIX)objcopy
+OBJDUMP = $(TOOLPREFIX)objdump
+CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -O2 -Wall -MD -ggdb -m32 -Werror -fno-omit-frame-pointer
+CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
+ASFLAGS = -m32 -gdwarf-2 -Wa,-divide
+# FreeBSD ld wants ``elf_i386_fbsd''
+LDFLAGS += -m $(shell $(LD) -V | grep elf_i386 2>/dev/null | head -n 1)
+
+# Disable PIE when possible (for Ubuntu 16.10 toolchain)
+ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]no-pie'),)
+CFLAGS += -fno-pie -no-pie
+endif
+ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]nopie'),)
+CFLAGS += -fno-pie -nopie
+endif
+
+xv6.img: bootblock kernel
+	dd if=/dev/zero of=xv6.img count=10000
+	dd if=bootblock of=xv6.img conv=notrunc
+	dd if=kernel of=xv6.img seek=1 conv=notrunc
+
+xv6memfs.img: bootblock kernelmemfs
+	dd if=/dev/zero of=xv6memfs.img count=10000
+	dd if=bootblock of=xv6memfs.img conv=notrunc
+	dd if=kernelmemfs of=xv6memfs.img seek=1 conv=notrunc
+
+bootblock: bootasm.S bootmain.c
+	$(CC) $(CFLAGS) -fno-pic -O -nostdinc -I. -c bootmain.c
+	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c bootasm.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0x7C00 -o bootblock.o bootasm.o bootmain.o
+	$(OBJDUMP) -S bootblock.o > bootblock.asm
+	$(OBJCOPY) -S -O binary -j .text bootblock.o bootblock
+	./sign.pl bootblock
+
+entryother: entryother.S
+	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c entryother.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0x7000 -o bootblockother.o entryother.o
+	$(OBJCOPY) -S -O binary -j .text bootblockother.o entryother
+	$(OBJDUMP) -S bootblockother.o > entryother.asm
+
+initcode: initcode.S
+	$(CC) $(CFLAGS) -nostdinc -I. -c initcode.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0 -o initcode.out initcode.o
+	$(OBJCOPY) -S -O binary initcode.out initcode
+	$(OBJDUMP) -S initcode.o > initcode.asm
+
+kernel: $(OBJS) entry.o entryother initcode kernel.ld
+	$(LD) $(LDFLAGS) -T kernel.ld -o kernel entry.o $(OBJS) -b binary initcode entryother
+	$(OBJDUMP) -S kernel > kernel.asm
+	$(OBJDUMP) -t kernel | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
+
+# kernelmemfs is a copy of kernel that maintains the
+# disk image in memory instead of writing to a disk.
+# This is not so useful for testing persistent storage or
+# exploring disk buffering implementations, but it is
+# great for testing the kernel on real hardware without
+# needing a scratch disk.
+MEMFSOBJS = $(filter-out ide.o,$(OBJS)) memide.o
+kernelmemfs: $(MEMFSOBJS) entry.o entryother initcode kernel.ld fs.img
+	$(LD) $(LDFLAGS) -T kernel.ld -o kernelmemfs entry.o  $(MEMFSOBJS) -b binary initcode entryother fs.img
+	$(OBJDUMP) -S kernelmemfs > kernelmemfs.asm
+	$(OBJDUMP) -t kernelmemfs | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernelmemfs.sym
+
+tags: $(OBJS) entryother.S _init
+	etags *.S *.c
+
+vectors.S: vectors.pl
+	./vectors.pl > vectors.S
+
+ULIB = ulib.o usys.o printf.o umalloc.o
+
+_%: %.o $(ULIB)
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o $@ $^
+	$(OBJDUMP) -S $@ > $*.asm
+	$(OBJDUMP) -t $@ | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $*.sym
+
+_forktest: forktest.o $(ULIB)
+	# forktest has less library code linked in - needs to be small
+	# in order to be able to max out the proc table.
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o _forktest forktest.o ulib.o usys.o
+	$(OBJDUMP) -S _forktest > forktest.asm
+
+mkfs: mkfs.c fs.h
+	gcc -Werror -Wall -o mkfs mkfs.c
+
+# Prevent deletion of intermediate files, e.g. cat.o, after first build, so
+# that disk image changes after first build are persistent until clean.  More
+# details:
+# http://www.gnu.org/software/make/manual/html_node/Chained-Rules.html
+.PRECIOUS: %.o
+
+UPROGS=\
+	_cat\
+	_echo\
+	_forktest\
+	_grep\
+	_init\
+	_kill\
+	_ln\
+	_ls\
+	_mkdir\
+	_rm\
+	_sh\
+	_stressfs\
+	_usertests\
+	_wc\
+	_zombie\
+	_date\
+	_alarmtest\
+
+fs.img: mkfs README $(UPROGS)
+	./mkfs fs.img README $(UPROGS)
+
+-include *.d
+
+clean: 
+	rm -f *.tex *.dvi *.idx *.aux *.log *.ind *.ilg \
+	*.o *.d *.asm *.sym vectors.S bootblock entryother \
+	initcode initcode.out kernel xv6.img fs.img kernelmemfs \
+	xv6memfs.img mkfs .gdbinit \
+	$(UPROGS)
+
+# make a printout
+FILES = $(shell grep -v '^\#' runoff.list)
+PRINT = runoff.list runoff.spec README toc.hdr toc.ftr $(FILES)
+
+xv6.pdf: $(PRINT)
+	./runoff
+	ls -l xv6.pdf
+
+print: xv6.pdf
+
+# run in emulators
+
+bochs : fs.img xv6.img
+	if [ ! -e .bochsrc ]; then ln -s dot-bochsrc .bochsrc; fi
+	bochs -q
+
+# try to generate a unique GDB port
+GDBPORT = $(shell expr `id -u` % 5000 + 25000)
+# QEMU's gdb stub command line changed in 0.11
+QEMUGDB = $(shell if $(QEMU) -help | grep -q '^-gdb'; \
+	then echo "-gdb tcp::$(GDBPORT)"; \
+	else echo "-s -p $(GDBPORT)"; fi)
+ifndef CPUS
+CPUS := 2
+endif
+QEMUOPTS = -drive file=fs.img,index=1,media=disk,format=raw -drive file=xv6.img,index=0,media=disk,format=raw -smp $(CPUS) -m 512 $(QEMUEXTRA)
+
+gdb:
+	gdb -x .gdbinit
+	
+qemu: fs.img xv6.img
+	$(QEMU) -serial mon:stdio $(QEMUOPTS)
+
+qemu-memfs: xv6memfs.img
+	$(QEMU) -drive file=xv6memfs.img,index=0,media=disk,format=raw -smp $(CPUS) -m 256
+
+qemu-nox: fs.img xv6.img
+	$(QEMU) -nographic $(QEMUOPTS)
+
+.gdbinit: .gdbinit.tmpl
+	sed "s/localhost:1234/localhost:$(GDBPORT)/" < $^ > $@
+
+qemu-gdb: fs.img xv6.img .gdbinit
+	@echo "*** Now run 'gdb'." 1>&2
+	$(QEMU) -serial mon:stdio $(QEMUOPTS) -S $(QEMUGDB)
+
+qemu-nox-gdb: fs.img xv6.img .gdbinit
+	@echo "*** Now run 'gdb'." 1>&2
+	$(QEMU) -nographic $(QEMUOPTS) -S $(QEMUGDB)
+
+# CUT HERE
+# prepare dist for students
+# after running make dist, probably want to
+# rename it to rev0 or rev1 or so on and then
+# check in that version.
+
+EXTRA=\
+	mkfs.c ulib.c user.h cat.c echo.c forktest.c grep.c kill.c\
+	ln.c ls.c mkdir.c rm.c stressfs.c usertests.c wc.c zombie.c\
+	printf.c umalloc.c\
+	README dot-bochsrc *.pl toc.* runoff runoff1 runoff.list\
+	.gdbinit.tmpl gdbutil\
+
+dist:
+	rm -rf dist
+	mkdir dist
+	for i in $(FILES); \
+	do \
+		grep -v PAGEBREAK $$i >dist/$$i; \
+	done
+	sed '/CUT HERE/,$$d' Makefile >dist/Makefile
+	echo >dist/runoff.spec
+	cp $(EXTRA) dist
+
+dist-test:
+	rm -rf dist
+	make dist
+	rm -rf dist-test
+	mkdir dist-test
+	cp dist/* dist-test
+	cd dist-test; $(MAKE) print
+	cd dist-test; $(MAKE) bochs || true
+	cd dist-test; $(MAKE) qemu
+
+# update this rule (change rev#) when it is time to
+# make a new revision.
+tar:
+	rm -rf /tmp/xv6
+	mkdir -p /tmp/xv6
+	cp dist/* dist/.gdbinit.tmpl /tmp/xv6
+	(cd /tmp; tar cf - xv6) | gzip >xv6-rev10.tar.gz  # the next one will be 10 (9/17)
+
+.PHONY: dist-test dist
diff --git a/xv6-public/xv6.si4project/Backup/Makefile(5214) b/xv6-public/xv6.si4project/Backup/Makefile(5214)
new file mode 100644
index 0000000..bddf7a2
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/Makefile(5214)
@@ -0,0 +1,290 @@
+OBJS = \
+	bio.o\
+	console.o\
+	exec.o\
+	file.o\
+	fs.o\
+	ide.o\
+	ioapic.o\
+	kalloc.o\
+	kbd.o\
+	lapic.o\
+	log.o\
+	main.o\
+	mp.o\
+	picirq.o\
+	pipe.o\
+	proc.o\
+	sleeplock.o\
+	spinlock.o\
+	string.o\
+	swtch.o\
+	syscall.o\
+	sysfile.o\
+	sysproc.o\
+	trapasm.o\
+	trap.o\
+	uart.o\
+	vectors.o\
+	vm.o\
+
+# Cross-compiling (e.g., on Mac OS X)
+# TOOLPREFIX = i386-jos-elf
+
+# Using native tools (e.g., on X86 Linux)
+#TOOLPREFIX = 
+
+# Try to infer the correct TOOLPREFIX if not set
+ifndef TOOLPREFIX
+TOOLPREFIX := $(shell if i386-jos-elf-objdump -i 2>&1 | grep '^elf32-i386$$' >/dev/null 2>&1; \
+	then echo 'i386-jos-elf-'; \
+	elif objdump -i 2>&1 | grep 'elf32-i386' >/dev/null 2>&1; \
+	then echo ''; \
+	else echo "***" 1>&2; \
+	echo "*** Error: Couldn't find an i386-*-elf version of GCC/binutils." 1>&2; \
+	echo "*** Is the directory with i386-jos-elf-gcc in your PATH?" 1>&2; \
+	echo "*** If your i386-*-elf toolchain is installed with a command" 1>&2; \
+	echo "*** prefix other than 'i386-jos-elf-', set your TOOLPREFIX" 1>&2; \
+	echo "*** environment variable to that prefix and run 'make' again." 1>&2; \
+	echo "*** To turn off this error, run 'gmake TOOLPREFIX= ...'." 1>&2; \
+	echo "***" 1>&2; exit 1; fi)
+endif
+
+# If the makefile can't find QEMU, specify its path here
+# QEMU = qemu-system-i386
+
+# Try to infer the correct QEMU
+ifndef QEMU
+QEMU = $(shell if which qemu > /dev/null; \
+	then echo qemu; exit; \
+	elif which qemu-system-i386 > /dev/null; \
+	then echo qemu-system-i386; exit; \
+	elif which qemu-system-x86_64 > /dev/null; \
+	then echo qemu-system-x86_64; exit; \
+	else \
+	qemu=/Applications/Q.app/Contents/MacOS/i386-softmmu.app/Contents/MacOS/i386-softmmu; \
+	if test -x $$qemu; then echo $$qemu; exit; fi; fi; \
+	echo "***" 1>&2; \
+	echo "*** Error: Couldn't find a working QEMU executable." 1>&2; \
+	echo "*** Is the directory containing the qemu binary in your PATH" 1>&2; \
+	echo "*** or have you tried setting the QEMU variable in Makefile?" 1>&2; \
+	echo "***" 1>&2; exit 1)
+endif
+
+CC = $(TOOLPREFIX)gcc
+AS = $(TOOLPREFIX)gas
+LD = $(TOOLPREFIX)ld
+OBJCOPY = $(TOOLPREFIX)objcopy
+OBJDUMP = $(TOOLPREFIX)objdump
+CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -O2 -Wall -MD -ggdb -m32 -Werror -fno-omit-frame-pointer
+CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
+ASFLAGS = -m32 -gdwarf-2 -Wa,-divide
+# FreeBSD ld wants ``elf_i386_fbsd''
+LDFLAGS += -m $(shell $(LD) -V | grep elf_i386 2>/dev/null | head -n 1)
+
+# Disable PIE when possible (for Ubuntu 16.10 toolchain)
+ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]no-pie'),)
+CFLAGS += -fno-pie -no-pie
+endif
+ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]nopie'),)
+CFLAGS += -fno-pie -nopie
+endif
+
+xv6.img: bootblock kernel
+	dd if=/dev/zero of=xv6.img count=10000
+	dd if=bootblock of=xv6.img conv=notrunc
+	dd if=kernel of=xv6.img seek=1 conv=notrunc
+
+xv6memfs.img: bootblock kernelmemfs
+	dd if=/dev/zero of=xv6memfs.img count=10000
+	dd if=bootblock of=xv6memfs.img conv=notrunc
+	dd if=kernelmemfs of=xv6memfs.img seek=1 conv=notrunc
+
+bootblock: bootasm.S bootmain.c
+	$(CC) $(CFLAGS) -fno-pic -O -nostdinc -I. -c bootmain.c
+	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c bootasm.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0x7C00 -o bootblock.o bootasm.o bootmain.o
+	$(OBJDUMP) -S bootblock.o > bootblock.asm
+	$(OBJCOPY) -S -O binary -j .text bootblock.o bootblock
+	./sign.pl bootblock
+
+entryother: entryother.S
+	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c entryother.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0x7000 -o bootblockother.o entryother.o
+	$(OBJCOPY) -S -O binary -j .text bootblockother.o entryother
+	$(OBJDUMP) -S bootblockother.o > entryother.asm
+
+initcode: initcode.S
+	$(CC) $(CFLAGS) -nostdinc -I. -c initcode.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0 -o initcode.out initcode.o
+	$(OBJCOPY) -S -O binary initcode.out initcode
+	$(OBJDUMP) -S initcode.o > initcode.asm
+
+kernel: $(OBJS) entry.o entryother initcode kernel.ld
+	$(LD) $(LDFLAGS) -T kernel.ld -o kernel entry.o $(OBJS) -b binary initcode entryother
+	$(OBJDUMP) -S kernel > kernel.asm
+	$(OBJDUMP) -t kernel | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
+
+# kernelmemfs is a copy of kernel that maintains the
+# disk image in memory instead of writing to a disk.
+# This is not so useful for testing persistent storage or
+# exploring disk buffering implementations, but it is
+# great for testing the kernel on real hardware without
+# needing a scratch disk.
+MEMFSOBJS = $(filter-out ide.o,$(OBJS)) memide.o
+kernelmemfs: $(MEMFSOBJS) entry.o entryother initcode kernel.ld fs.img
+	$(LD) $(LDFLAGS) -T kernel.ld -o kernelmemfs entry.o  $(MEMFSOBJS) -b binary initcode entryother fs.img
+	$(OBJDUMP) -S kernelmemfs > kernelmemfs.asm
+	$(OBJDUMP) -t kernelmemfs | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernelmemfs.sym
+
+tags: $(OBJS) entryother.S _init
+	etags *.S *.c
+
+vectors.S: vectors.pl
+	./vectors.pl > vectors.S
+
+ULIB = ulib.o usys.o printf.o umalloc.o
+
+_%: %.o $(ULIB)
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o $@ $^
+	$(OBJDUMP) -S $@ > $*.asm
+	$(OBJDUMP) -t $@ | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $*.sym
+
+_forktest: forktest.o $(ULIB)
+	# forktest has less library code linked in - needs to be small
+	# in order to be able to max out the proc table.
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o _forktest forktest.o ulib.o usys.o
+	$(OBJDUMP) -S _forktest > forktest.asm
+
+mkfs: mkfs.c fs.h
+	gcc -Werror -Wall -o mkfs mkfs.c
+
+# Prevent deletion of intermediate files, e.g. cat.o, after first build, so
+# that disk image changes after first build are persistent until clean.  More
+# details:
+# http://www.gnu.org/software/make/manual/html_node/Chained-Rules.html
+.PRECIOUS: %.o
+
+UPROGS=\
+	_cat\
+	_echo\
+	_forktest\
+	_grep\
+	_init\
+	_kill\
+	_ln\
+	_ls\
+	_mkdir\
+	_rm\
+	_sh\
+	_stressfs\
+	_usertests\
+	_wc\
+	_zombie\
+	_date\
+
+fs.img: mkfs README $(UPROGS)
+	./mkfs fs.img README $(UPROGS)
+
+-include *.d
+
+clean: 
+	rm -f *.tex *.dvi *.idx *.aux *.log *.ind *.ilg \
+	*.o *.d *.asm *.sym vectors.S bootblock entryother \
+	initcode initcode.out kernel xv6.img fs.img kernelmemfs \
+	xv6memfs.img mkfs .gdbinit \
+	$(UPROGS)
+
+# make a printout
+FILES = $(shell grep -v '^\#' runoff.list)
+PRINT = runoff.list runoff.spec README toc.hdr toc.ftr $(FILES)
+
+xv6.pdf: $(PRINT)
+	./runoff
+	ls -l xv6.pdf
+
+print: xv6.pdf
+
+# run in emulators
+
+bochs : fs.img xv6.img
+	if [ ! -e .bochsrc ]; then ln -s dot-bochsrc .bochsrc; fi
+	bochs -q
+
+# try to generate a unique GDB port
+GDBPORT = $(shell expr `id -u` % 5000 + 25000)
+# QEMU's gdb stub command line changed in 0.11
+QEMUGDB = $(shell if $(QEMU) -help | grep -q '^-gdb'; \
+	then echo "-gdb tcp::$(GDBPORT)"; \
+	else echo "-s -p $(GDBPORT)"; fi)
+ifndef CPUS
+CPUS := 2
+endif
+QEMUOPTS = -drive file=fs.img,index=1,media=disk,format=raw -drive file=xv6.img,index=0,media=disk,format=raw -smp $(CPUS) -m 512 $(QEMUEXTRA)
+
+gdb:
+	gdb -x .gdbinit
+	
+qemu: fs.img xv6.img
+	$(QEMU) -serial mon:stdio $(QEMUOPTS)
+
+qemu-memfs: xv6memfs.img
+	$(QEMU) -drive file=xv6memfs.img,index=0,media=disk,format=raw -smp $(CPUS) -m 256
+
+qemu-nox: fs.img xv6.img
+	$(QEMU) -nographic $(QEMUOPTS)
+
+.gdbinit: .gdbinit.tmpl
+	sed "s/localhost:1234/localhost:$(GDBPORT)/" < $^ > $@
+
+qemu-gdb: fs.img xv6.img .gdbinit
+	@echo "*** Now run 'gdb'." 1>&2
+	$(QEMU) -serial mon:stdio $(QEMUOPTS) -S $(QEMUGDB)
+
+qemu-nox-gdb: fs.img xv6.img .gdbinit
+	@echo "*** Now run 'gdb'." 1>&2
+	$(QEMU) -nographic $(QEMUOPTS) -S $(QEMUGDB)
+
+# CUT HERE
+# prepare dist for students
+# after running make dist, probably want to
+# rename it to rev0 or rev1 or so on and then
+# check in that version.
+
+EXTRA=\
+	mkfs.c ulib.c user.h cat.c echo.c forktest.c grep.c kill.c\
+	ln.c ls.c mkdir.c rm.c stressfs.c usertests.c wc.c zombie.c\
+	printf.c umalloc.c\
+	README dot-bochsrc *.pl toc.* runoff runoff1 runoff.list\
+	.gdbinit.tmpl gdbutil\
+
+dist:
+	rm -rf dist
+	mkdir dist
+	for i in $(FILES); \
+	do \
+		grep -v PAGEBREAK $$i >dist/$$i; \
+	done
+	sed '/CUT HERE/,$$d' Makefile >dist/Makefile
+	echo >dist/runoff.spec
+	cp $(EXTRA) dist
+
+dist-test:
+	rm -rf dist
+	make dist
+	rm -rf dist-test
+	mkdir dist-test
+	cp dist/* dist-test
+	cd dist-test; $(MAKE) print
+	cd dist-test; $(MAKE) bochs || true
+	cd dist-test; $(MAKE) qemu
+
+# update this rule (change rev#) when it is time to
+# make a new revision.
+tar:
+	rm -rf /tmp/xv6
+	mkdir -p /tmp/xv6
+	cp dist/* dist/.gdbinit.tmpl /tmp/xv6
+	(cd /tmp; tar cf - xv6) | gzip >xv6-rev10.tar.gz  # the next one will be 10 (9/17)
+
+.PHONY: dist-test dist
diff --git a/xv6-public/xv6.si4project/Backup/Makefile(7715) b/xv6-public/xv6.si4project/Backup/Makefile(7715)
new file mode 100644
index 0000000..d6925de
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/Makefile(7715)
@@ -0,0 +1,296 @@
+OBJS = \
+	bio.o\
+	console.o\
+	exec.o\
+	file.o\
+	fs.o\
+	ide.o\
+	ioapic.o\
+	kalloc.o\
+	kbd.o\
+	lapic.o\
+	log.o\
+	main.o\
+	mp.o\
+	picirq.o\
+	pipe.o\
+	proc.o\
+	sleeplock.o\
+	spinlock.o\
+	string.o\
+	swtch.o\
+	syscall.o\
+	sysfile.o\
+	sysproc.o\
+	trapasm.o\
+	trap.o\
+	uart.o\
+	vectors.o\
+	vm.o\
+
+# Cross-compiling (e.g., on Mac OS X)
+# TOOLPREFIX = i386-jos-elf
+
+# Using native tools (e.g., on X86 Linux)
+#TOOLPREFIX = 
+
+# Try to infer the correct TOOLPREFIX if not set
+ifndef TOOLPREFIX
+TOOLPREFIX := $(shell if i386-jos-elf-objdump -i 2>&1 | grep '^elf32-i386$$' >/dev/null 2>&1; \
+	then echo 'i386-jos-elf-'; \
+	elif objdump -i 2>&1 | grep 'elf32-i386' >/dev/null 2>&1; \
+	then echo ''; \
+	else echo "***" 1>&2; \
+	echo "*** Error: Couldn't find an i386-*-elf version of GCC/binutils." 1>&2; \
+	echo "*** Is the directory with i386-jos-elf-gcc in your PATH?" 1>&2; \
+	echo "*** If your i386-*-elf toolchain is installed with a command" 1>&2; \
+	echo "*** prefix other than 'i386-jos-elf-', set your TOOLPREFIX" 1>&2; \
+	echo "*** environment variable to that prefix and run 'make' again." 1>&2; \
+	echo "*** To turn off this error, run 'gmake TOOLPREFIX= ...'." 1>&2; \
+	echo "***" 1>&2; exit 1; fi)
+endif
+
+# If the makefile can't find QEMU, specify its path here
+# QEMU = qemu-system-i386
+
+# Try to infer the correct QEMU
+ifndef QEMU
+QEMU = $(shell if which qemu > /dev/null; \
+	then echo qemu; exit; \
+	elif which qemu-system-i386 > /dev/null; \
+	then echo qemu-system-i386; exit; \
+	elif which qemu-system-x86_64 > /dev/null; \
+	then echo qemu-system-x86_64; exit; \
+	else \
+	qemu=/Applications/Q.app/Contents/MacOS/i386-softmmu.app/Contents/MacOS/i386-softmmu; \
+	if test -x $$qemu; then echo $$qemu; exit; fi; fi; \
+	echo "***" 1>&2; \
+	echo "*** Error: Couldn't find a working QEMU executable." 1>&2; \
+	echo "*** Is the directory containing the qemu binary in your PATH" 1>&2; \
+	echo "*** or have you tried setting the QEMU variable in Makefile?" 1>&2; \
+	echo "***" 1>&2; exit 1)
+endif
+
+CC = $(TOOLPREFIX)gcc
+AS = $(TOOLPREFIX)gas
+LD = $(TOOLPREFIX)ld
+OBJCOPY = $(TOOLPREFIX)objcopy
+OBJDUMP = $(TOOLPREFIX)objdump
+CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -O2 -Wall -MD -ggdb -m32 -Werror -fno-omit-frame-pointer
+CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
+ASFLAGS = -m32 -gdwarf-2 -Wa,-divide
+# FreeBSD ld wants ``elf_i386_fbsd''
+LDFLAGS += -m $(shell $(LD) -V | grep elf_i386 2>/dev/null | head -n 1)
+
+# Disable PIE when possible (for Ubuntu 16.10 toolchain)
+ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]no-pie'),)
+CFLAGS += -fno-pie -no-pie
+endif
+ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]nopie'),)
+CFLAGS += -fno-pie -nopie
+endif
+
+xv6.img: bootblock kernel
+	dd if=/dev/zero of=xv6.img count=10000
+	dd if=bootblock of=xv6.img conv=notrunc
+	dd if=kernel of=xv6.img seek=1 conv=notrunc
+
+xv6memfs.img: bootblock kernelmemfs
+	dd if=/dev/zero of=xv6memfs.img count=10000
+	dd if=bootblock of=xv6memfs.img conv=notrunc
+	dd if=kernelmemfs of=xv6memfs.img seek=1 conv=notrunc
+
+bootblock: bootasm.S bootmain.c
+	$(CC) $(CFLAGS) -fno-pic -O -nostdinc -I. -c bootmain.c
+	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c bootasm.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0x7C00 -o bootblock.o bootasm.o bootmain.o
+	$(OBJDUMP) -S bootblock.o > bootblock.asm
+	$(OBJCOPY) -S -O binary -j .text bootblock.o bootblock
+	./sign.pl bootblock
+
+entryother: entryother.S
+	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c entryother.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0x7000 -o bootblockother.o entryother.o
+	$(OBJCOPY) -S -O binary -j .text bootblockother.o entryother
+	$(OBJDUMP) -S bootblockother.o > entryother.asm
+
+initcode: initcode.S
+	$(CC) $(CFLAGS) -nostdinc -I. -c initcode.S
+	$(LD) $(LDFLAGS) -N -e start -Ttext 0 -o initcode.out initcode.o
+	$(OBJCOPY) -S -O binary initcode.out initcode
+	$(OBJDUMP) -S initcode.o > initcode.asm
+
+kernel: $(OBJS) entry.o entryother initcode kernel.ld
+	$(LD) $(LDFLAGS) -T kernel.ld -o kernel entry.o $(OBJS) -b binary initcode entryother
+	$(OBJDUMP) -S kernel > kernel.asm
+	$(OBJDUMP) -t kernel | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
+
+_uthread: uthread.o uthread_switch.o
+$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o _uthread uthread.o uthread_switch.o $(ULIB)
+$(OBJDUMP) -S _uthread > uthread.asm
+
+# kernelmemfs is a copy of kernel that maintains the
+# disk image in memory instead of writing to a disk.
+# This is not so useful for testing persistent storage or
+# exploring disk buffering implementations, but it is
+# great for testing the kernel on real hardware without
+# needing a scratch disk.
+MEMFSOBJS = $(filter-out ide.o,$(OBJS)) memide.o
+kernelmemfs: $(MEMFSOBJS) entry.o entryother initcode kernel.ld fs.img
+	$(LD) $(LDFLAGS) -T kernel.ld -o kernelmemfs entry.o  $(MEMFSOBJS) -b binary initcode entryother fs.img
+	$(OBJDUMP) -S kernelmemfs > kernelmemfs.asm
+	$(OBJDUMP) -t kernelmemfs | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernelmemfs.sym
+
+tags: $(OBJS) entryother.S _init
+	etags *.S *.c
+
+vectors.S: vectors.pl
+	./vectors.pl > vectors.S
+
+ULIB = ulib.o usys.o printf.o umalloc.o
+
+_%: %.o $(ULIB)
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o $@ $^
+	$(OBJDUMP) -S $@ > $*.asm
+	$(OBJDUMP) -t $@ | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $*.sym
+
+_forktest: forktest.o $(ULIB)
+	# forktest has less library code linked in - needs to be small
+	# in order to be able to max out the proc table.
+	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o _forktest forktest.o ulib.o usys.o
+	$(OBJDUMP) -S _forktest > forktest.asm
+
+mkfs: mkfs.c fs.h
+	gcc -Werror -Wall -o mkfs mkfs.c
+
+# Prevent deletion of intermediate files, e.g. cat.o, after first build, so
+# that disk image changes after first build are persistent until clean.  More
+# details:
+# http://www.gnu.org/software/make/manual/html_node/Chained-Rules.html
+.PRECIOUS: %.o
+
+UPROGS=\
+	_cat\
+	_echo\
+	_forktest\
+	_grep\
+	_init\
+	_kill\
+	_ln\
+	_ls\
+	_mkdir\
+	_rm\
+	_sh\
+	_stressfs\
+	_usertests\
+	_wc\
+	_zombie\
+	_date\
+	_alarmtest\
+	_uthread\
+
+fs.img: mkfs README $(UPROGS)
+	./mkfs fs.img README $(UPROGS)
+
+-include *.d
+
+clean: 
+	rm -f *.tex *.dvi *.idx *.aux *.log *.ind *.ilg \
+	*.o *.d *.asm *.sym vectors.S bootblock entryother \
+	initcode initcode.out kernel xv6.img fs.img kernelmemfs \
+	xv6memfs.img mkfs .gdbinit \
+	$(UPROGS)
+
+# make a printout
+FILES = $(shell grep -v '^\#' runoff.list)
+PRINT = runoff.list runoff.spec README toc.hdr toc.ftr $(FILES)
+
+xv6.pdf: $(PRINT)
+	./runoff
+	ls -l xv6.pdf
+
+print: xv6.pdf
+
+# run in emulators
+
+bochs : fs.img xv6.img
+	if [ ! -e .bochsrc ]; then ln -s dot-bochsrc .bochsrc; fi
+	bochs -q
+
+# try to generate a unique GDB port
+GDBPORT = $(shell expr `id -u` % 5000 + 25000)
+# QEMU's gdb stub command line changed in 0.11
+QEMUGDB = $(shell if $(QEMU) -help | grep -q '^-gdb'; \
+	then echo "-gdb tcp::$(GDBPORT)"; \
+	else echo "-s -p $(GDBPORT)"; fi)
+ifndef CPUS
+CPUS := 2
+endif
+QEMUOPTS = -drive file=fs.img,index=1,media=disk,format=raw -drive file=xv6.img,index=0,media=disk,format=raw -smp $(CPUS) -m 512 $(QEMUEXTRA)
+
+gdb:
+	gdb -x .gdbinit
+	
+qemu: fs.img xv6.img
+	$(QEMU) -serial mon:stdio $(QEMUOPTS)
+
+qemu-memfs: xv6memfs.img
+	$(QEMU) -drive file=xv6memfs.img,index=0,media=disk,format=raw -smp $(CPUS) -m 256
+
+qemu-nox: fs.img xv6.img
+	$(QEMU) -nographic $(QEMUOPTS)
+
+.gdbinit: .gdbinit.tmpl
+	sed "s/localhost:1234/localhost:$(GDBPORT)/" < $^ > $@
+
+qemu-gdb: fs.img xv6.img .gdbinit
+	@echo "*** Now run 'gdb'." 1>&2
+	$(QEMU) -serial mon:stdio $(QEMUOPTS) -S $(QEMUGDB)
+
+qemu-nox-gdb: fs.img xv6.img .gdbinit
+	@echo "*** Now run 'gdb'." 1>&2
+	$(QEMU) -nographic $(QEMUOPTS) -S $(QEMUGDB)
+
+# CUT HERE
+# prepare dist for students
+# after running make dist, probably want to
+# rename it to rev0 or rev1 or so on and then
+# check in that version.
+
+EXTRA=\
+	mkfs.c ulib.c user.h cat.c echo.c forktest.c grep.c kill.c\
+	ln.c ls.c mkdir.c rm.c stressfs.c usertests.c wc.c zombie.c\
+	printf.c umalloc.c\
+	README dot-bochsrc *.pl toc.* runoff runoff1 runoff.list\
+	.gdbinit.tmpl gdbutil\
+
+dist:
+	rm -rf dist
+	mkdir dist
+	for i in $(FILES); \
+	do \
+		grep -v PAGEBREAK $$i >dist/$$i; \
+	done
+	sed '/CUT HERE/,$$d' Makefile >dist/Makefile
+	echo >dist/runoff.spec
+	cp $(EXTRA) dist
+
+dist-test:
+	rm -rf dist
+	make dist
+	rm -rf dist-test
+	mkdir dist-test
+	cp dist/* dist-test
+	cd dist-test; $(MAKE) print
+	cd dist-test; $(MAKE) bochs || true
+	cd dist-test; $(MAKE) qemu
+
+# update this rule (change rev#) when it is time to
+# make a new revision.
+tar:
+	rm -rf /tmp/xv6
+	mkdir -p /tmp/xv6
+	cp dist/* dist/.gdbinit.tmpl /tmp/xv6
+	(cd /tmp; tar cf - xv6) | gzip >xv6-rev10.tar.gz  # the next one will be 10 (9/17)
+
+.PHONY: dist-test dist
diff --git a/xv6-public/xv6.si4project/Backup/alarmtest(5755).c b/xv6-public/xv6.si4project/Backup/alarmtest(5755).c
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/alarmtest(5755).c
@@ -0,0 +1 @@
+
diff --git a/xv6-public/xv6.si4project/Backup/ide(3563).c b/xv6-public/xv6.si4project/Backup/ide(3563).c
new file mode 100644
index 0000000..b4c0b1f
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/ide(3563).c
@@ -0,0 +1,168 @@
+// Simple PIO-based (non-DMA) IDE driver code.
+
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+#include "traps.h"
+#include "spinlock.h"
+#include "sleeplock.h"
+#include "fs.h"
+#include "buf.h"
+
+#define SECTOR_SIZE   512
+#define IDE_BSY       0x80
+#define IDE_DRDY      0x40
+#define IDE_DF        0x20
+#define IDE_ERR       0x01
+
+#define IDE_CMD_READ  0x20
+#define IDE_CMD_WRITE 0x30
+#define IDE_CMD_RDMUL 0xc4
+#define IDE_CMD_WRMUL 0xc5
+
+// idequeue points to the buf now being read/written to the disk.
+// idequeue->qnext points to the next buf to be processed.
+// You must hold idelock while manipulating queue.
+
+static struct spinlock idelock;
+static struct buf *idequeue;
+
+static int havedisk1;
+static void idestart(struct buf*);
+
+// Wait for IDE disk to become ready.
+static int
+idewait(int checkerr)
+{
+  int r;
+
+  while(((r = inb(0x1f7)) & (IDE_BSY|IDE_DRDY)) != IDE_DRDY)
+    ;
+  if(checkerr && (r & (IDE_DF|IDE_ERR)) != 0)
+    return -1;
+  return 0;
+}
+
+void
+ideinit(void)
+{
+  int i;
+
+  initlock(&idelock, "ide");
+  ioapicenable(IRQ_IDE, ncpu - 1);
+  idewait(0);
+
+  // Check if disk 1 is present
+  outb(0x1f6, 0xe0 | (1<<4));
+  for(i=0; i<1000; i++){
+    if(inb(0x1f7) != 0){
+      havedisk1 = 1;
+      break;
+    }
+  }
+
+  // Switch back to disk 0.
+  outb(0x1f6, 0xe0 | (0<<4));
+}
+
+// Start the request for b.  Caller must hold idelock.
+static void
+idestart(struct buf *b)
+{
+  if(b == 0)
+    panic("idestart");
+  if(b->blockno >= FSSIZE)
+    panic("incorrect blockno");
+  int sector_per_block =  BSIZE/SECTOR_SIZE;
+  int sector = b->blockno * sector_per_block;
+  int read_cmd = (sector_per_block == 1) ? IDE_CMD_READ :  IDE_CMD_RDMUL;
+  int write_cmd = (sector_per_block == 1) ? IDE_CMD_WRITE : IDE_CMD_WRMUL;
+
+  if (sector_per_block > 7) panic("idestart");
+
+  idewait(0);
+  outb(0x3f6, 0);  // generate interrupt
+  outb(0x1f2, sector_per_block);  // number of sectors
+  outb(0x1f3, sector & 0xff);
+  outb(0x1f4, (sector >> 8) & 0xff);
+  outb(0x1f5, (sector >> 16) & 0xff);
+  outb(0x1f6, 0xe0 | ((b->dev&1)<<4) | ((sector>>24)&0x0f));
+  if(b->flags & B_DIRTY){
+    outb(0x1f7, write_cmd);
+    outsl(0x1f0, b->data, BSIZE/4);
+  } else {
+    outb(0x1f7, read_cmd);
+  }
+}
+
+// Interrupt handler.
+void
+ideintr(void)
+{
+  struct buf *b;
+
+  // First queued buffer is the active request.
+  acquire(&idelock);
+
+  if((b = idequeue) == 0){
+    release(&idelock);
+    return;
+  }
+  idequeue = b->qnext;
+
+  // Read data if needed.
+  if(!(b->flags & B_DIRTY) && idewait(1) >= 0)
+    insl(0x1f0, b->data, BSIZE/4);
+
+  // Wake process waiting for this buf.
+  b->flags |= B_VALID;
+  b->flags &= ~B_DIRTY;
+  wakeup(b);
+
+  // Start disk on next buf in queue.
+  if(idequeue != 0)
+    idestart(idequeue);
+
+  release(&idelock);
+}
+
+//PAGEBREAK!
+// Sync buf with disk.
+// If B_DIRTY is set, write buf to disk, clear B_DIRTY, set B_VALID.
+// Else if B_VALID is not set, read buf from disk, set B_VALID.
+void
+iderw(struct buf *b)
+{
+  struct buf **pp;
+
+  if(!holdingsleep(&b->lock))
+    panic("iderw: buf not locked");
+  if((b->flags & (B_VALID|B_DIRTY)) == B_VALID)
+    panic("iderw: nothing to do");
+  if(b->dev != 0 && !havedisk1)
+    panic("iderw: ide disk 1 not present");
+
+  acquire(&idelock);  //DOC:acquire-lock
+
+  // Append b to idequeue.
+  b->qnext = 0;
+  for(pp=&idequeue; *pp; pp=&(*pp)->qnext)  //DOC:insert-queue
+    ;
+  *pp = b;
+
+  // Start disk if necessary.
+  if(idequeue == b)
+    idestart(b);
+
+  // Wait for request to finish.
+  while((b->flags & (B_VALID|B_DIRTY)) != B_VALID){
+    sleep(b, &idelock);
+  }
+
+
+  release(&idelock);
+}
diff --git a/xv6-public/xv6.si4project/Backup/proc(1173).h b/xv6-public/xv6.si4project/Backup/proc(1173).h
new file mode 100644
index 0000000..1647114
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/proc(1173).h
@@ -0,0 +1,58 @@
+// Per-CPU state
+struct cpu {
+  uchar apicid;                // Local APIC ID
+  struct context *scheduler;   // swtch() here to enter scheduler
+  struct taskstate ts;         // Used by x86 to find stack for interrupt
+  struct segdesc gdt[NSEGS];   // x86 global descriptor table
+  volatile uint started;       // Has the CPU started?
+  int ncli;                    // Depth of pushcli nesting.
+  int intena;                  // Were interrupts enabled before pushcli?
+  struct proc *proc;           // The process running on this cpu or null
+};
+
+extern struct cpu cpus[NCPU];
+extern int ncpu;
+
+//PAGEBREAK: 17
+// Saved registers for kernel context switches.
+// Don't need to save all the segment registers (%cs, etc),
+// because they are constant across kernel contexts.
+// Don't need to save %eax, %ecx, %edx, because the
+// x86 convention is that the caller has saved them.
+// Contexts are stored at the bottom of the stack they
+// describe; the stack pointer is the address of the context.
+// The layout of the context matches the layout of the stack in swtch.S
+// at the "Switch stacks" comment. Switch doesn't save eip explicitly,
+// but it is on the stack and allocproc() manipulates it.
+struct context {
+  uint edi;
+  uint esi;
+  uint ebx;
+  uint ebp;
+  uint eip;
+};
+
+enum procstate { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };
+
+// Per-process state
+struct proc {
+  uint sz;                     // Size of process memory (bytes)
+  pde_t* pgdir;                // Page table
+  char *kstack;                // Bottom of kernel stack for this process
+  enum procstate state;        // Process state
+  int pid;                     // Process ID
+  struct proc *parent;         // Parent process
+  struct trapframe *tf;        // Trap frame for current syscall
+  struct context *context;     // swtch() here to run process
+  void *chan;                  // If non-zero, sleeping on chan
+  int killed;                  // If non-zero, have been killed
+  struct file *ofile[NOFILE];  // Open files
+  struct inode *cwd;           // Current directory
+  char name[16];               // Process name (debugging)
+};
+
+// Process memory is laid out contiguously, low addresses first:
+//   text
+//   original data and bss
+//   fixed-size stack
+//   expandable heap
diff --git a/xv6-public/xv6.si4project/Backup/proc(6211).c b/xv6-public/xv6.si4project/Backup/proc(6211).c
new file mode 100644
index 0000000..806b1b1
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/proc(6211).c
@@ -0,0 +1,534 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "x86.h"
+#include "proc.h"
+#include "spinlock.h"
+
+struct {
+  struct spinlock lock;
+  struct proc proc[NPROC];
+} ptable;
+
+static struct proc *initproc;
+
+int nextpid = 1;
+extern void forkret(void);
+extern void trapret(void);
+
+static void wakeup1(void *chan);
+
+void
+pinit(void)
+{
+  initlock(&ptable.lock, "ptable");
+}
+
+// Must be called with interrupts disabled
+int
+cpuid() {
+  return mycpu()-cpus;
+}
+
+// Must be called with interrupts disabled to avoid the caller being
+// rescheduled between reading lapicid and running through the loop.
+struct cpu*
+mycpu(void)
+{
+  int apicid, i;
+  
+  if(readeflags()&FL_IF)
+    panic("mycpu called with interrupts enabled\n");
+  
+  apicid = lapicid();
+  // APIC IDs are not guaranteed to be contiguous. Maybe we should have
+  // a reverse map, or reserve a register to store &cpus[i].
+  for (i = 0; i < ncpu; ++i) {
+    if (cpus[i].apicid == apicid)
+      return &cpus[i];
+  }
+  panic("unknown apicid\n");
+}
+
+// Disable interrupts so that we are not rescheduled
+// while reading proc from the cpu structure
+struct proc*
+myproc(void) {
+  struct cpu *c;
+  struct proc *p;
+  pushcli();
+  c = mycpu();
+  p = c->proc;
+  popcli();
+  return p;
+}
+
+//PAGEBREAK: 32
+// Look in the process table for an UNUSED proc.
+// If found, change state to EMBRYO and initialize
+// state required to run in the kernel.
+// Otherwise return 0.
+static struct proc*
+allocproc(void)
+{
+  struct proc *p;
+  char *sp;
+
+  acquire(&ptable.lock);
+
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++)
+    if(p->state == UNUSED)
+      goto found;
+
+  release(&ptable.lock);
+  return 0;
+
+found:
+  p->state = EMBRYO;
+  p->pid = nextpid++;
+
+  release(&ptable.lock);
+
+  // Allocate kernel stack.
+  if((p->kstack = kalloc()) == 0){
+    p->state = UNUSED;
+    return 0;
+  }
+  sp = p->kstack + KSTACKSIZE;
+
+  // Leave room for trap frame.
+  sp -= sizeof *p->tf;
+  p->tf = (struct trapframe*)sp;
+
+  // Set up new context to start executing at forkret,
+  // which returns to trapret.
+  sp -= 4;
+  *(uint*)sp = (uint)trapret;
+
+  sp -= sizeof *p->context;
+  p->context = (struct context*)sp;
+  memset(p->context, 0, sizeof *p->context);
+  p->context->eip = (uint)forkret;
+
+  return p;
+}
+
+//PAGEBREAK: 32
+// Set up first user process.
+void
+userinit(void)
+{
+  struct proc *p;
+  extern char _binary_initcode_start[], _binary_initcode_size[];
+
+  p = allocproc();
+  
+  initproc = p;
+  if((p->pgdir = setupkvm()) == 0)
+    panic("userinit: out of memory?");
+  inituvm(p->pgdir, _binary_initcode_start, (int)_binary_initcode_size);
+  p->sz = PGSIZE;
+  memset(p->tf, 0, sizeof(*p->tf));
+  p->tf->cs = (SEG_UCODE << 3) | DPL_USER;
+  p->tf->ds = (SEG_UDATA << 3) | DPL_USER;
+  p->tf->es = p->tf->ds;
+  p->tf->ss = p->tf->ds;
+  p->tf->eflags = FL_IF;
+  p->tf->esp = PGSIZE;
+  p->tf->eip = 0;  // beginning of initcode.S
+
+  safestrcpy(p->name, "initcode", sizeof(p->name));
+  p->cwd = namei("/");
+
+  // this assignment to p->state lets other cores
+  // run this process. the acquire forces the above
+  // writes to be visible, and the lock is also needed
+  // because the assignment might not be atomic.
+  acquire(&ptable.lock);
+
+  p->state = RUNNABLE;
+
+  release(&ptable.lock);
+}
+
+// Grow current process's memory by n bytes.
+// Return 0 on success, -1 on failure.
+int
+growproc(int n)
+{
+  uint sz;
+  struct proc *curproc = myproc();
+
+  sz = curproc->sz;
+  if(n > 0){
+    if((sz = allocuvm(curproc->pgdir, sz, sz + n)) == 0)
+      return -1;
+  } else if(n < 0){
+    if((sz = deallocuvm(curproc->pgdir, sz, sz + n)) == 0)
+      return -1;
+  }
+  curproc->sz = sz;
+  switchuvm(curproc);
+  return 0;
+}
+
+// Create a new process copying p as the parent.
+// Sets up stack to return as if from system call.
+// Caller must set state of returned proc to RUNNABLE.
+int
+fork(void)
+{
+  int i, pid;
+  struct proc *np;
+  struct proc *curproc = myproc();
+
+  // Allocate process.
+  if((np = allocproc()) == 0){
+    return -1;
+  }
+
+  // Copy process state from proc.
+  if((np->pgdir = copyuvm(curproc->pgdir, curproc->sz)) == 0){
+    kfree(np->kstack);
+    np->kstack = 0;
+    np->state = UNUSED;
+    return -1;
+  }
+  np->sz = curproc->sz;
+  np->parent = curproc;
+  *np->tf = *curproc->tf;
+
+  // Clear %eax so that fork returns 0 in the child.
+  np->tf->eax = 0;
+
+  for(i = 0; i < NOFILE; i++)
+    if(curproc->ofile[i])
+      np->ofile[i] = filedup(curproc->ofile[i]);
+  np->cwd = idup(curproc->cwd);
+
+  safestrcpy(np->name, curproc->name, sizeof(curproc->name));
+
+  pid = np->pid;
+
+  acquire(&ptable.lock);
+
+  np->state = RUNNABLE;
+
+  release(&ptable.lock);
+
+  return pid;
+}
+
+// Exit the current process.  Does not return.
+// An exited process remains in the zombie state
+// until its parent calls wait() to find out it exited.
+void
+exit(void)
+{
+  struct proc *curproc = myproc();
+  struct proc *p;
+  int fd;
+
+  if(curproc == initproc)
+    panic("init exiting");
+
+  // Close all open files.
+  for(fd = 0; fd < NOFILE; fd++){
+    if(curproc->ofile[fd]){
+      fileclose(curproc->ofile[fd]);
+      curproc->ofile[fd] = 0;
+    }
+  }
+
+  begin_op();
+  iput(curproc->cwd);
+  end_op();
+  curproc->cwd = 0;
+
+  acquire(&ptable.lock);
+
+  // Parent might be sleeping in wait().
+  wakeup1(curproc->parent);
+
+  // Pass abandoned children to init.
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+    if(p->parent == curproc){
+      p->parent = initproc;
+      if(p->state == ZOMBIE)
+        wakeup1(initproc);
+    }
+  }
+
+  // Jump into the scheduler, never to return.
+  curproc->state = ZOMBIE;
+  sched();
+  panic("zombie exit");
+}
+
+// Wait for a child process to exit and return its pid.
+// Return -1 if this process has no children.
+int
+wait(void)
+{
+  struct proc *p;
+  int havekids, pid;
+  struct proc *curproc = myproc();
+  
+  acquire(&ptable.lock);
+  for(;;){
+    // Scan through table looking for exited children.
+    havekids = 0;
+    for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+      if(p->parent != curproc)
+        continue;
+      havekids = 1;
+      if(p->state == ZOMBIE){
+        // Found one.
+        pid = p->pid;
+        kfree(p->kstack);
+        p->kstack = 0;
+        freevm(p->pgdir);
+        p->pid = 0;
+        p->parent = 0;
+        p->name[0] = 0;
+        p->killed = 0;
+        p->state = UNUSED;
+        release(&ptable.lock);
+        return pid;
+      }
+    }
+
+    // No point waiting if we don't have any children.
+    if(!havekids || curproc->killed){
+      release(&ptable.lock);
+      return -1;
+    }
+
+    // Wait for children to exit.  (See wakeup1 call in proc_exit.)
+    sleep(curproc, &ptable.lock);  //DOC: wait-sleep
+  }
+}
+
+//PAGEBREAK: 42
+// Per-CPU process scheduler.
+// Each CPU calls scheduler() after setting itself up.
+// Scheduler never returns.  It loops, doing:
+//  - choose a process to run
+//  - swtch to start running that process
+//  - eventually that process transfers control
+//      via swtch back to the scheduler.
+void
+scheduler(void)
+{
+  struct proc *p;
+  struct cpu *c = mycpu();
+  c->proc = 0;
+  
+  for(;;){
+    // Enable interrupts on this processor.
+    sti();
+
+    // Loop over process table looking for process to run.
+    acquire(&ptable.lock);
+    for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+      if(p->state != RUNNABLE)
+        continue;
+
+      // Switch to chosen process.  It is the process's job
+      // to release ptable.lock and then reacquire it
+      // before jumping back to us.
+      c->proc = p;
+      switchuvm(p);
+      p->state = RUNNING;
+
+      swtch(&(c->scheduler), p->context);
+      switchkvm();
+
+      // Process is done running for now.
+      // It should have changed its p->state before coming back.
+      c->proc = 0;
+    }
+    release(&ptable.lock);
+
+  }
+}
+
+// Enter scheduler.  Must hold only ptable.lock
+// and have changed proc->state. Saves and restores
+// intena because intena is a property of this
+// kernel thread, not this CPU. It should
+// be proc->intena and proc->ncli, but that would
+// break in the few places where a lock is held but
+// there's no process.
+void
+sched(void)
+{
+  int intena;
+  struct proc *p = myproc();
+
+  if(!holding(&ptable.lock))
+    panic("sched ptable.lock");
+  if(mycpu()->ncli != 1)
+    panic("sched locks");
+  if(p->state == RUNNING)
+    panic("sched running");
+  if(readeflags()&FL_IF)
+    panic("sched interruptible");
+  intena = mycpu()->intena;
+  swtch(&p->context, mycpu()->scheduler);
+  mycpu()->intena = intena;
+}
+
+// Give up the CPU for one scheduling round.
+void
+yield(void)
+{
+  acquire(&ptable.lock);  //DOC: yieldlock
+  myproc()->state = RUNNABLE;
+  sched();
+  release(&ptable.lock);
+}
+
+// A fork child's very first scheduling by scheduler()
+// will swtch here.  "Return" to user space.
+void
+forkret(void)
+{
+  static int first = 1;
+  // Still holding ptable.lock from scheduler.
+  release(&ptable.lock);
+
+  if (first) {
+    // Some initialization functions must be run in the context
+    // of a regular process (e.g., they call sleep), and thus cannot
+    // be run from main().
+    first = 0;
+    iinit(ROOTDEV);
+    initlog(ROOTDEV);
+  }
+
+  // Return to "caller", actually trapret (see allocproc).
+}
+
+// Atomically release lock and sleep on chan.
+// Reacquires lock when awakened.
+void
+sleep(void *chan, struct spinlock *lk)
+{
+  struct proc *p = myproc();
+  
+  if(p == 0)
+    panic("sleep");
+
+  if(lk == 0)
+    panic("sleep without lk");
+
+  // Must acquire ptable.lock in order to
+  // change p->state and then call sched.
+  // Once we hold ptable.lock, we can be
+  // guaranteed that we won't miss any wakeup
+  // (wakeup runs with ptable.lock locked),
+  // so it's okay to release lk.
+  if(lk != &ptable.lock){  //DOC: sleeplock0
+    acquire(&ptable.lock);  //DOC: sleeplock1
+    release(lk);
+  }
+  // Go to sleep.
+  p->chan = chan;
+  p->state = SLEEPING;
+
+  sched();
+
+  // Tidy up.
+  p->chan = 0;
+
+  // Reacquire original lock.
+  if(lk != &ptable.lock){  //DOC: sleeplock2
+    release(&ptable.lock);
+    acquire(lk);
+  }
+}
+
+//PAGEBREAK!
+// Wake up all processes sleeping on chan.
+// The ptable lock must be held.
+static void
+wakeup1(void *chan)
+{
+  struct proc *p;
+
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++)
+    if(p->state == SLEEPING && p->chan == chan)
+      p->state = RUNNABLE;
+}
+
+// Wake up all processes sleeping on chan.
+void
+wakeup(void *chan)
+{
+  acquire(&ptable.lock);
+  wakeup1(chan);
+  release(&ptable.lock);
+}
+
+// Kill the process with the given pid.
+// Process won't exit until it returns
+// to user space (see trap in trap.c).
+int
+kill(int pid)
+{
+  struct proc *p;
+
+  acquire(&ptable.lock);
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+    if(p->pid == pid){
+      p->killed = 1;
+      // Wake process from sleep if necessary.
+      if(p->state == SLEEPING)
+        p->state = RUNNABLE;
+      release(&ptable.lock);
+      return 0;
+    }
+  }
+  release(&ptable.lock);
+  return -1;
+}
+
+//PAGEBREAK: 36
+// Print a process listing to console.  For debugging.
+// Runs when user types ^P on console.
+// No lock to avoid wedging a stuck machine further.
+void
+procdump(void)
+{
+  static char *states[] = {
+  [UNUSED]    "unused",
+  [EMBRYO]    "embryo",
+  [SLEEPING]  "sleep ",
+  [RUNNABLE]  "runble",
+  [RUNNING]   "run   ",
+  [ZOMBIE]    "zombie"
+  };
+  int i;
+  struct proc *p;
+  char *state;
+  uint pc[10];
+
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+    if(p->state == UNUSED)
+      continue;
+    if(p->state >= 0 && p->state < NELEM(states) && states[p->state])
+      state = states[p->state];
+    else
+      state = "???";
+    cprintf("%d %s %s", p->pid, state, p->name);
+    if(p->state == SLEEPING){
+      getcallerpcs((uint*)p->context->ebp+2, pc);
+      for(i=0; i<10 && pc[i] != 0; i++)
+        cprintf(" %p", pc[i]);
+    }
+    cprintf("\n");
+  }
+}
diff --git a/xv6-public/xv6.si4project/Backup/syscall(2531).h b/xv6-public/xv6.si4project/Backup/syscall(2531).h
new file mode 100644
index 0000000..56c922a
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/syscall(2531).h
@@ -0,0 +1,24 @@
+// System call numbers
+#define SYS_fork    1
+#define SYS_exit    2
+#define SYS_wait    3
+#define SYS_pipe    4
+#define SYS_read    5
+#define SYS_kill    6
+#define SYS_exec    7
+#define SYS_fstat   8
+#define SYS_chdir   9
+#define SYS_dup    10
+#define SYS_getpid 11
+#define SYS_sbrk   12
+#define SYS_sleep  13
+#define SYS_uptime 14
+#define SYS_open   15
+#define SYS_write  16
+#define SYS_mknod  17
+#define SYS_unlink 18
+#define SYS_link   19
+#define SYS_mkdir  20
+#define SYS_close  21
+#define SYS_date   22
+#define SYS_dup2   23
\ No newline at end of file
diff --git a/xv6-public/xv6.si4project/Backup/syscall(3495).c b/xv6-public/xv6.si4project/Backup/syscall(3495).c
new file mode 100644
index 0000000..aa74c8d
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/syscall(3495).c
@@ -0,0 +1,182 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+#include "syscall.h"
+
+// User code makes a system call with INT T_SYSCALL.
+// System call number in %eax.
+// Arguments on the stack, from the user call to the C
+// library system call function. The saved user %esp points
+// to a saved program counter, and then the first argument.
+
+// Fetch the int at addr from the current process.
+int
+fetchint(uint addr, int *ip)
+{
+  struct proc *curproc = myproc();
+
+  if(addr >= curproc->sz || addr+4 > curproc->sz)
+    return -1;
+  *ip = *(int*)(addr);
+  return 0;
+}
+
+// Fetch the nul-terminated string at addr from the current process.
+// Doesn't actually copy the string - just sets *pp to point at it.
+// Returns length of string, not including nul.
+int
+fetchstr(uint addr, char **pp)
+{
+  char *s, *ep;
+  struct proc *curproc = myproc();
+
+  if(addr >= curproc->sz)
+    return -1;
+  *pp = (char*)addr;
+  ep = (char*)curproc->sz;
+  for(s = *pp; s < ep; s++){
+    if(*s == 0)
+      return s - *pp;
+  }
+  return -1;
+}
+
+// Fetch the nth 32-bit system call argument.
+int
+argint(int n, int *ip)
+{
+  return fetchint((myproc()->tf->esp) + 4 + 4*n, ip);
+}
+
+// Fetch the nth word-sized system call argument as a pointer
+// to a block of memory of size bytes.  Check that the pointer
+// lies within the process address space.
+int
+argptr(int n, char **pp, int size)
+{
+  int i;
+  struct proc *curproc = myproc();
+ 
+  if(argint(n, &i) < 0)
+    return -1;
+  if(size < 0 || (uint)i >= curproc->sz || (uint)i+size > curproc->sz)
+    return -1;
+  *pp = (char*)i;
+  return 0;
+}
+
+// Fetch the nth word-sized system call argument as a string pointer.
+// Check that the pointer is valid and the string is nul-terminated.
+// (There is no shared writable memory, so the string can't change
+// between this check and being used by the kernel.)
+int
+argstr(int n, char **pp)
+{
+  int addr;
+  if(argint(n, &addr) < 0)
+    return -1;
+  return fetchstr(addr, pp);
+}
+
+extern int sys_chdir(void);
+extern int sys_close(void);
+extern int sys_dup(void);
+extern int sys_dup2(void);
+
+extern int sys_exec(void);
+extern int sys_exit(void);
+extern int sys_fork(void);
+extern int sys_fstat(void);
+extern int sys_getpid(void);
+extern int sys_kill(void);
+extern int sys_link(void);
+extern int sys_mkdir(void);
+extern int sys_mknod(void);
+extern int sys_open(void);
+extern int sys_pipe(void);
+extern int sys_read(void);
+extern int sys_sbrk(void);
+extern int sys_sleep(void);
+extern int sys_unlink(void);
+extern int sys_wait(void);
+extern int sys_write(void);
+extern int sys_uptime(void);
+extern int sys_date(void);
+
+// 函数指针数组    
+// 初始化中写 [] 是指syscalls[SYS_fork=1] = sys_fork
+static int (*syscalls[])(void) = {
+[SYS_fork]    sys_fork,
+[SYS_exit]    sys_exit,
+[SYS_wait]    sys_wait,
+[SYS_pipe]    sys_pipe,
+[SYS_read]    sys_read,
+[SYS_kill]    sys_kill,
+[SYS_exec]    sys_exec,
+[SYS_fstat]   sys_fstat,
+[SYS_chdir]   sys_chdir,
+[SYS_dup]     sys_dup,
+[SYS_dup2]    sys_dup2,
+[SYS_getpid]  sys_getpid,
+[SYS_sbrk]    sys_sbrk,
+[SYS_sleep]   sys_sleep,
+[SYS_uptime]  sys_uptime,
+[SYS_open]    sys_open,
+[SYS_write]   sys_write,
+[SYS_mknod]   sys_mknod,
+[SYS_unlink]  sys_unlink,
+[SYS_link]    sys_link,
+[SYS_mkdir]   sys_mkdir,
+[SYS_close]   sys_close,
+[SYS_date]    sys_date,
+
+};
+/*
+static char *syscall_name[] = {
+[SYS_fork]    "fork",
+[SYS_exit]    "exit",
+[SYS_wait]    "wait",
+[SYS_pipe]    "pipe",
+[SYS_read]    "read",
+[SYS_kill]    "kill",
+[SYS_exec]    "exec",
+[SYS_fstat]   "fstat",
+[SYS_chdir]   "chdir",
+[SYS_dup]     "dup",
+[SYS_getpid]  "getpid",
+[SYS_sbrk]    "sbrk",
+[SYS_sleep]   "sleep",
+[SYS_uptime]  "uptime",
+[SYS_open]    "open",
+[SYS_write]   "write",
+[SYS_mknod]   "mknod",
+[SYS_unlink]  "unlink",
+[SYS_link]    "link",
+[SYS_mkdir]   "mkdir",
+[SYS_close]   "close",
+[SYS_date]	  "date",
+};
+*/
+
+void
+syscall(void)
+{
+  int num;
+  // 关中断读取进程信息
+  struct proc *curproc = myproc();
+  //num 取值应该[1-最大的系统调用序号]
+  num = curproc->tf->eax;
+  // 检查系统调用是否存在
+  if(num > 0 && num < NELEM(syscalls) && syscalls[num]) {
+     curproc->tf->eax = syscalls[num]();  //存储系统调用返回值
+	 // cprintf("%s: -> %d\n",syscall_name[num], curproc->tf->eax);
+  } else {
+    cprintf("%d %s: unknown sys call %d\n",
+            curproc->pid, curproc->name, num);
+    curproc->tf->eax = -1;
+  }
+}
diff --git a/xv6-public/xv6.si4project/Backup/sysproc(2335).c b/xv6-public/xv6.si4project/Backup/sysproc(2335).c
new file mode 100644
index 0000000..b82f5c9
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/sysproc(2335).c
@@ -0,0 +1,101 @@
+#include "types.h"
+#include "x86.h"
+#include "defs.h"
+#include "date.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+
+int
+sys_fork(void)
+{
+  return fork();
+}
+
+int
+sys_exit(void)
+{
+  exit();
+  return 0;  // not reached
+}
+
+int
+sys_wait(void)
+{
+  return wait();
+}
+
+int
+sys_kill(void)
+{
+  int pid;
+
+  if(argint(0, &pid) < 0)
+    return -1;
+  return kill(pid);
+}
+
+int
+sys_getpid(void)
+{
+  return myproc()->pid;
+}
+
+int
+sys_sbrk(void)
+{
+  int addr;
+  int n;
+
+  if(argint(0, &n) < 0)
+    return -1;
+  addr = myproc()->sz;
+  myproc()->sz += n;
+  return addr;
+}
+
+int
+sys_sleep(void)
+{
+  int n;
+  uint ticks0;
+
+  if(argint(0, &n) < 0)
+    return -1;
+  acquire(&tickslock);
+  ticks0 = ticks;
+  while(ticks - ticks0 < n){
+    if(myproc()->killed){
+      release(&tickslock);
+      return -1;
+    }
+    sleep(&ticks, &tickslock);
+  }
+  release(&tickslock);
+  return 0;
+}
+
+// return how many clock tick interrupts have occurred
+// since start.
+int
+sys_uptime(void)
+{
+  uint xticks;
+
+  acquire(&tickslock);
+  xticks = ticks;
+  release(&tickslock);
+  return xticks;
+}
+
+int
+sys_date(void) 
+{
+	struct rtcdate *r;
+	if(argptr(0, (void*)&r, sizeof(struct rtcdate)) < 0)
+    	return -1;
+	
cmostime(r);
+	return 0;
+}
+
diff --git a/xv6-public/xv6.si4project/Backup/trap(2304).c b/xv6-public/xv6.si4project/Backup/trap(2304).c
new file mode 100644
index 0000000..f5f3562
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/trap(2304).c
@@ -0,0 +1,133 @@
+#include "types.h"
+#include "defs.h"
+#include "param.h"
+#include "memlayout.h"
+#include "mmu.h"
+#include "proc.h"
+#include "x86.h"
+#include "traps.h"
+#include "spinlock.h"
+
+// Interrupt descriptor table (shared by all CPUs).
+struct gatedesc idt[256];
+extern uint vectors[];  // in vectors.S: array of 256 entry pointers
+struct spinlock tickslock;
+uint ticks;
+
+void
+tvinit(void)
+{
+  int i;
+
+  for(i = 0; i < 256; i++)
+    SETGATE(idt[i], 0, SEG_KCODE<<3, vectors[i], 0);
+  SETGATE(idt[T_SYSCALL], 1, SEG_KCODE<<3, vectors[T_SYSCALL], DPL_USER);
+
+  initlock(&tickslock, "time");
+}
+
+void
+idtinit(void)
+{
+  lidt(idt, sizeof(idt));
+}
+
+
+
+
+//PAGEBREAK: 41
+void
+trap(struct trapframe *tf)
+{
+  if(tf->trapno == T_SYSCALL){
+    if(myproc()->killed)
+      exit();
+    myproc()->tf = tf;
+    syscall();
+    if(myproc()->killed)
+      exit();
+    return;
+  }
+  char *mem;
+  switch(tf->trapno){
+  case T_IRQ0 + IRQ_TIMER:
+    if(cpuid() == 0){
+      acquire(&tickslock);
+      ticks++;
+      wakeup(&ticks);
+      release(&tickslock);
+    }
+    lapiceoi();
+    break;
+  case T_IRQ0 + IRQ_IDE:
+    ideintr();
+    lapiceoi();
+    break;
+  case T_IRQ0 + IRQ_IDE+1:
+    // Bochs generates spurious IDE1 interrupts.
+    break;
+  case T_IRQ0 + IRQ_KBD:
+    kbdintr();
+    lapiceoi();
+    break;
+  case T_IRQ0 + IRQ_COM1:
+    uartintr();
+    lapiceoi();
+    break;
+  case T_IRQ0 + 7:
+  case T_IRQ0 + IRQ_SPURIOUS:
+    cprintf("cpu%d: spurious interrupt at %x:%x\n",
+            cpuid(), tf->cs, tf->eip);
+    lapiceoi();
+    break;
+
+  // T_PGFLT = 14
+  case T_PGFLT: 
+    // kallo或mappages执行失败，则继续执行下面的default.
+    // In user space, assume process misbehaved.
+    // cr2包含发生页面错误时的线性地址.
+    mem = kalloc();
+    if(mem != 0){
+        uint va = PGROUNDDOWN(rcr2());
+	    memset(mem, 0, PGSIZE);
+		extern int mappages(pde_t *pgdir, void *va, uint size, uint pa, int perm);
+		if(mappages(myproc()->pgdir,(void *)va, PGSIZE, V2P(mem), PTE_W|PTE_U) >= 0) {
+			// 全部执行成功才break;
+			break;	
+		}
+    }
+	
+  //PAGEBREAK: 13
+  default:
+    // tf->cs&3 不明白
+    if(myproc() == 0 || (tf->cs&3) == 0){
+      // In kernel, it must be our mistake.
+      cprintf("unexpected trap %d from cpu %d eip %x (cr2=0x%x)\n",
+              tf->trapno, cpuid(), tf->eip, rcr2());
+      panic("trap");
+    }
+    // In user space, assume process misbehaved.
+   
+    cprintf("pid %d %s: trap %d err %d on cpu %d "
+            "eip 0x%x addr 0x%x--kill proc\n",
+            myproc()->pid, myproc()->name, tf->trapno,
+            tf->err, cpuid(), tf->eip, rcr2());
+    myproc()->killed = 1;
+  }
+
+  // Force process exit if it has been killed and is in user space.
+  // (If it is still executing in the kernel, let it keep running
+  // until it gets to the regular system call return.)
+  if(myproc() && myproc()->killed && (tf->cs&3) == DPL_USER)
+    exit();
+
+  // Force process to give up CPU on clock tick.
+  // If interrupts were on while locks held, would need to check nlock.
+  if(myproc() && myproc()->state == RUNNING &&
+     tf->trapno == T_IRQ0+IRQ_TIMER)
+    yield();
+
+  // Check if the process has been killed since we yielded
+  if(myproc() && myproc()->killed && (tf->cs&3) == DPL_USER)
+    exit();
+}
diff --git a/xv6-public/xv6.si4project/Backup/user(4192).h b/xv6-public/xv6.si4project/Backup/user(4192).h
new file mode 100644
index 0000000..4e138ed
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/user(4192).h
@@ -0,0 +1,42 @@
+struct stat;
+struct rtcdate;
+
+// system calls
+int fork(void);
+int exit(void) __attribute__((noreturn));
+int wait(void);
+int pipe(int*);
+int write(int, const void*, int);
+int read(int, void*, int);
+int close(int);
+int kill(int);
+int exec(char*, char**);
+int open(const char*, int);
+int mknod(const char*, short, short);
+int unlink(const char*);
+int fstat(int fd, struct stat*);
+int link(const char*, const char*);
+int mkdir(const char*);
+int chdir(const char*);
+int dup(int);
+int getpid(void);
+char* sbrk(int);
+int sleep(int);
+int uptime(void);
+int date(struct rtcdate* );
+int dup2(int , int);
+
+
+// ulib.c
+int stat(const char*, struct stat*);
+char* strcpy(char*, const char*);
+void *memmove(void*, const void*, int);
+char* strchr(const char*, char c);
+int strcmp(const char*, const char*);
+void printf(int, const char*, ...);
+char* gets(char*, int max);
+uint strlen(const char*);
+void* memset(void*, int, uint);
+void* malloc(uint);
+void free(void*);
+int atoi(const char*);
diff --git a/xv6-public/xv6.si4project/Backup/usys(6843).S b/xv6-public/xv6.si4project/Backup/usys(6843).S
new file mode 100644
index 0000000..9a40a57
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/usys(6843).S
@@ -0,0 +1,33 @@
+#include "syscall.h"
+#include "traps.h"
+
+#define SYSCALL(name) \
+  .globl name; \
+  name: \
+    movl $SYS_ ## name, %eax; \
+    int $T_SYSCALL; \
+    ret
+
+SYSCALL(fork)
+SYSCALL(exit)
+SYSCALL(wait)
+SYSCALL(pipe)
+SYSCALL(read)
+SYSCALL(write)
+SYSCALL(close)
+SYSCALL(kill)
+SYSCALL(exec)
+SYSCALL(open)
+SYSCALL(mknod)
+SYSCALL(unlink)
+SYSCALL(fstat)
+SYSCALL(link)
+SYSCALL(mkdir)
+SYSCALL(chdir)
+SYSCALL(dup)
+SYSCALL(dup2)
+SYSCALL(getpid)
+SYSCALL(sbrk)
+SYSCALL(sleep)
+SYSCALL(uptime)
+SYSCALL(date)
diff --git a/xv6-public/xv6.si4project/Backup/uthread_switch(3995).S b/xv6-public/xv6.si4project/Backup/uthread_switch(3995).S
new file mode 100644
index 0000000..904c4f6
--- /dev/null
+++ b/xv6-public/xv6.si4project/Backup/uthread_switch(3995).S
@@ -0,0 +1,10 @@
+	.text
+
+/* Switch from current_thread to next_thread. Make next_thread
+ * the current_thread, and set next_thread to 0.
+ * Use eax as a temporary register; it is caller saved.
+ */
+	.globl thread_switch
+thread_switch:
+	/* YOUR CODE HERE */
+	ret				/* pop return address from stack */
diff --git a/xv6-public/xv6.si4project/cache/parse/alarmtest.c.sisc b/xv6-public/xv6.si4project/cache/parse/alarmtest.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/asm.h.sisc b/xv6-public/xv6.si4project/cache/parse/asm.h.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/bio.c.sisc b/xv6-public/xv6.si4project/cache/parse/bio.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/bootmain.c.sisc b/xv6-public/xv6.si4project/cache/parse/bootmain.c.sisc
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GIT binary patch
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diff --git a/xv6-public/xv6.si4project/cache/parse/forktest.c.sisc b/xv6-public/xv6.si4project/cache/parse/forktest.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/fs.c.sisc b/xv6-public/xv6.si4project/cache/parse/fs.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/sh.c.sisc b/xv6-public/xv6.si4project/cache/parse/sh.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/spinlock.h.sisc b/xv6-public/xv6.si4project/cache/parse/spinlock.h.sisc
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index 0000000000000000000000000000000000000000..5641e1a3d74aefcf6d30e621acca9de226955c76
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diff --git a/xv6-public/xv6.si4project/cache/parse/stat.h.sisc b/xv6-public/xv6.si4project/cache/parse/stat.h.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/stressfs.c.sisc b/xv6-public/xv6.si4project/cache/parse/stressfs.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/syscall.c.sisc b/xv6-public/xv6.si4project/cache/parse/syscall.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/syscall.h.sisc b/xv6-public/xv6.si4project/cache/parse/syscall.h.sisc
new file mode 100644
index 0000000000000000000000000000000000000000..391208a2b23cd227e052d088452bb76cda021dd3
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diff --git a/xv6-public/xv6.si4project/cache/parse/sysfile.c.sisc b/xv6-public/xv6.si4project/cache/parse/sysfile.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/types.h.sisc b/xv6-public/xv6.si4project/cache/parse/types.h.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/uart.c.sisc b/xv6-public/xv6.si4project/cache/parse/uart.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/ulib.c.sisc b/xv6-public/xv6.si4project/cache/parse/ulib.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/umalloc.c.sisc b/xv6-public/xv6.si4project/cache/parse/umalloc.c.sisc
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diff --git a/xv6-public/xv6.si4project/cache/parse/zombie.c.sisc b/xv6-public/xv6.si4project/cache/parse/zombie.c.sisc
new file mode 100644
index 0000000000000000000000000000000000000000..f21b33398d4fa584a619bb74a86b61a1f6a8f54c
GIT binary patch
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diff --git a/xv6-public/xv6.si4project/xv6.SearchResults b/xv6-public/xv6.si4project/xv6.SearchResults
new file mode 100644
index 0000000..77b88b3
--- /dev/null
+++ b/xv6-public/xv6.si4project/xv6.SearchResults
@@ -0,0 +1,4 @@
+---- sys_write Matches (3 in 2 files) ----
+syscall.c line 104 : extern int sys_write(void);
+syscall.c line 126 : [SYS_write]   sys_write,
+sysfile.c line 83 : sys_write(void)
diff --git a/xv6-public/xv6.si4project/xv6.bookmarks.xml b/xv6-public/xv6.si4project/xv6.bookmarks.xml
new file mode 100644
index 0000000..c8b9cb1
--- /dev/null
+++ b/xv6-public/xv6.si4project/xv6.bookmarks.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<SourceInsightBookmarks
+	AppVer="4.00.0084"
+	AppVerMinReader="4.00.0009"
+	>
+	<Bookmarks/>
+</SourceInsightBookmarks>
diff --git a/xv6-public/xv6.si4project/xv6.sip_sym b/xv6-public/xv6.si4project/xv6.sip_sym
new file mode 100644
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diff --git a/xv6-public/xv6.si4project/xv6.sip_xm b/xv6-public/xv6.si4project/xv6.sip_xm
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diff --git a/xv6-public/xv6.si4project/xv6.sip_xr b/xv6-public/xv6.si4project/xv6.sip_xr
new file mode 100644
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diff --git a/xv6-public/xv6.si4project/xv6.sip_xsd b/xv6-public/xv6.si4project/xv6.sip_xsd
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diff --git a/xv6-public/xv6.si4project/xv6.siproj_settings.xml b/xv6-public/xv6.si4project/xv6.siproj_settings.xml
new file mode 100644
index 0000000..ca84b35
--- /dev/null
+++ b/xv6-public/xv6.si4project/xv6.siproj_settings.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
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diff --git a/xv6-public/xv6.si4project/xv6.snippets.xml b/xv6-public/xv6.si4project/xv6.snippets.xml
new file mode 100644
index 0000000..a337f1d
--- /dev/null
+++ b/xv6-public/xv6.si4project/xv6.snippets.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<SourceInsightCodeSnippets
+	AppVer="4.00.0084"
+	AppVerMinReader="4.00.0019"
+	>
+	<SnippetList/>
+</SourceInsightCodeSnippets>
diff --git a/xv6-public/zombie.c b/xv6-public/zombie.c
new file mode 100644
index 0000000..ee817da
--- /dev/null
+++ b/xv6-public/zombie.c
@@ -0,0 +1,14 @@
+// Create a zombie process that
+// must be reparented at exit.
+
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int
+main(void)
+{
+  if(fork() > 0)
+    sleep(5);  // Let child exit before parent.
+  exit();
+}