Add LINKS Document

LINKS.md

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+有帮助的链接
+========================
+
+Linux 启动
+------------------------
+
+* [Linux/x86 boot protocol](https://www.kernel.org/doc/Documentation/x86/boot.txt)
+* [Linux kernel parameters](https://github.com/torvalds/linux/blob/master/Documentation/kernel-parameters.txt)
+
+保护模式
+------------------------
+
+* [64-ia-32-architectures-software-developer-vol-3a-part-1-manual.pdf](http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html)
+
+串口编程
+------------------------
+
+* [8250 UART Programming](http://en.wikibooks.org/wiki/Serial_Programming/8250_UART_Programming#UART_Registers)
+* [Serial ports on OSDEV](http://wiki.osdev.org/Serial_Ports)
+
+VGA
+------------------------
+
+* [Video Graphics Array (VGA)](http://en.wikipedia.org/wiki/Video_Graphics_Array)
+
+IO
+------------------------
+
+* [IO port programming](http://www.tldp.org/HOWTO/text/IO-Port-Programming)
+
+GCC and GAS
+------------------------
+
+* [GCC type attributes](https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html)
+* [Assembler Directives](http://www.chemie.fu-berlin.de/chemnet/use/info/gas/gas_toc.html#TOC65)
+
+重要的数据结构
+--------------------------
+
+* [task_struct definition](http://lxr.free-electrons.com/source/include/linux/sched.h#L1274)
+
+其他框架
+------------------------
+
+* [PowerPC and Linux Kernel Inside](http://www.systemcomputing.org/ppc/)
+
+有帮助的链接
+------------------------
+
+* [Linux x86 Program Start Up](http://dbp-consulting.com/tutorials/debugging/linuxProgramStartup.html)
+* [Memory Layout in Program Execution (32 bits)](http://fgiasson.com/articles/memorylayout.txt)