X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseLib%2FIa32%2FEnablePaging64.S;h=08950ce0e2b7155c9e47825546bfb5a9595d2f54;hp=44b7e16558fd8cafdf08fdc63a532cc182a6b8c8;hb=881813d7a93d9009c873515b043c41c4554779e4;hpb=e1f414b6a7d8a0424e0e01f655b09a4612b4d0e8

diff --git a/MdePkg/Library/BaseLib/Ia32/EnablePaging64.S b/MdePkg/Library/BaseLib/Ia32/EnablePaging64.S
index 44b7e16558..08950ce0e2 100644
--- a/MdePkg/Library/BaseLib/Ia32/EnablePaging64.S
+++ b/MdePkg/Library/BaseLib/Ia32/EnablePaging64.S
@@ -1,22 +1,17 @@
-//
-// Include common header file for this module.
-//
-#include "CommonHeader.h"
-
 #------------------------------------------------------------------------------
 #
-# Copyright (c) 2006, Intel Corporation
-# All rights reserved. This program and the accompanying materials
+# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+# This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
 # which accompanies this distribution.  The full text of the license may be found at
-# http://opensource.org/licenses/bsd-license.php
+# http://opensource.org/licenses/bsd-license.php.
 #
 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #
 # Module Name:
 #
-#   EnablePaging64.Asm
+#   EnablePaging64.S
 #
 # Abstract:
 #
@@ -26,7 +21,7 @@
 #
 #------------------------------------------------------------------------------
 
-.globl ASM_PFX(InternalX86EnablePaging64)
+ASM_GLOBAL ASM_PFX(InternalX86EnablePaging64)
 
 #------------------------------------------------------------------------------
 # VOID
@@ -41,7 +36,7 @@
 #------------------------------------------------------------------------------
 ASM_PFX(InternalX86EnablePaging64):
     cli
-    movl    $LongStart, (%esp)
+    movl    $LongStart, (%esp)          # offset for far retf, seg is the 1st arg
     movl    %cr4, %eax
     orb     $0x20, %al
     movl    %eax, %cr4                  # enable PAE
@@ -50,11 +45,11 @@ ASM_PFX(InternalX86EnablePaging64):
     orb     $1, %ah                     # set LME
     wrmsr
     movl    %cr0, %eax
-    btsl    $31, %eax
+    btsl    $31, %eax                   # set PG
     movl    %eax, %cr0                  # enable paging
-    lret
+    lret                                # topmost 2 dwords hold the address
 LongStart:                              # long mode starts here
-    .byte   0x67, 0x48
+    .byte   0x67, 0x48                  # 32-bit address size, 64-bit operand size
     movl    (%esp), %ebx                # mov rbx, [esp]
     .byte   0x67, 0x48
     movl    8(%esp), %ecx               # mov rcx, [esp + 8]
@@ -63,6 +58,6 @@ LongStart:                              # long mode starts here
     .byte   0x67, 0x48
     movl    0x18(%esp), %esp            # mov rsp, [esp + 18h]
     .byte   0x48
-    addl    $0x-20, %esp                # add rsp, -20h
+    addl    $-0x20, %esp                # add rsp, -20h
     call    *%ebx                       # call rbx
-    jmp     .
+    jmp     .                           # no one should get here