From 68612146c4003082aa8ed61030df075ab1cee6fb Mon Sep 17 00:00:00 2001
From: hailin cai <hailin.cai.neulion@gmail.com>
Date: Fri, 19 Feb 2016 12:22:02 -0500
Subject: [PATCH] Update Booting/linux-bootstrap-2md.md

---
 Booting/linux-bootstrap-2md.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Booting/linux-bootstrap-2md.md b/Booting/linux-bootstrap-2md.md
index fcedf19..53824b0 100644
--- a/Booting/linux-bootstrap-2md.md
+++ b/Booting/linux-bootstrap-2md.md
@@ -337,13 +337,14 @@ ENDPROC(memset)
 
 ```C
     char *stack_end;
-
+    
+    //%P1 is (-STACK_SIZE)
     if (boot_params.hdr.loadflags & CAN_USE_HEAP) {
         asm("leal %P1(%%esp),%0"
             : "=r" (stack_end) : "i" (-STACK_SIZE));
 ```
 
-`stack_end = esp - STACK_SIZE`.
+换言之`stack_end = esp - STACK_SIZE`.
 
 Then there is the `heap_end` calculation:
 ```c