sravan/system76-edk2
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Current Thunk16.asm implementation clears reserved bits, which does not follow IA32 SDM. Now the fix is to only clear PAE and PSE bit of CR4 for real mode.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14037 6f19259b-4bc3-4df7-8a09-765794883524
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li-elvin
2013-01-07 07:12:19 +00:00
parent a7f87053e0
commit 48c8b6a299
4 changed files with 8 additions and 8 deletions
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4
MdePkg/Library/BaseLib/X64/Thunk16.asm
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@@ -3,7 +3,7 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
; Copyright (c) 2006 - 2013, 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
@@ -282,7 +282,7 @@ InternalAsmThunk16 PROC USES rbp rbx rsi rdi
and eax, 7ffffffeh ; clear PE, PG bits
mov rbp, cr4
mov [rcx], ebp ; save CR4 in SavedCr4
and ebp, 300h ; clear all but PCE and OSFXSR bits
and ebp, NOT 30h ; clear PAE, PSE bits
mov esi, r8d ; esi <- 16-bit stack segment
DB 6ah, DATA32 ; push DATA32
pop rdx ; rdx <- 32-bit data segment selector