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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. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14037 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
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/Ia32/Thunk16.S
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@ -1,6 +1,6 @@
#------------------------------------------------------------------------------
#
# 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
@ -175,7 +175,7 @@ ASM_PFX(InternalAsmThunk16):
andl $0x7ffffffe, %eax # clear PE, PG bits
movl %cr4, %ebp
mov %ebp, 0xfffffff1(%edx)
andl $0x300, %ebp # clear all but PCE and OSFXSR bits
andl $0xffffffcf, %ebp # clear PAE, PSE bits
pushl $0x10
pop %ecx # ecx <- selector for data segments
lgdtl 0x20(%edx)

4
MdePkg/Library/BaseLib/Ia32/Thunk16.asm
View File

@ -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
@ -237,7 +237,7 @@ InternalAsmThunk16 PROC USES ebp ebx esi edi ds es fs gs
and eax, 7ffffffeh ; clear PE, PG bits
mov ebp, cr4
mov [edx + (SavedCr4 - SavedCr0)], ebp
and ebp, 300h ; clear all but PCE and OSFXSR bits
and ebp, NOT 30h ; clear PAE, PSE bits
push 10h
pop ecx ; ecx <- selector for data segments
lgdt fword ptr [edx + (_16Gdtr - SavedCr0)]

4
MdePkg/Library/BaseLib/X64/Thunk16.S
View File

@ -1,6 +1,6 @@
#------------------------------------------------------------------------------
#
# 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
@ -295,7 +295,7 @@ ASM_PFX(InternalAsmThunk16):
andl $0x7ffffffe,%eax # clear PE, PG bits
movq %cr4, %rbp
movl %ebp, (%rcx) # save CR4 in SavedCr4
andl $0x300,%ebp # clear all but PCE and OSFXSR bits
andl $0xffffffcf,%ebp # clear PAE, PSE bits
movl %r8d, %esi # esi <- 16-bit stack segment
.byte 0x6a, DATA32
popq %rdx

4
MdePkg/Library/BaseLib/X64/Thunk16.asm
View File

@ -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