diff options
| author | li-elvin <li-elvin@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-01-07 07:12:19 +0000 |
|---|---|---|
| committer | li-elvin <li-elvin@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-01-07 07:12:19 +0000 |
| commit | 48c8b6a299918612436e84ab22b55be6b88a90a2 (patch) | |
| tree | 43399051f0c890f272dc5a6316f86c95625c2e36 /MdePkg/Library/BaseLib/X64/Thunk16.asm | |
| parent | a7f87053e00ff8a24664b24f745702fa1ece2d80 (diff) | |
| download | edk2-platforms-48c8b6a299918612436e84ab22b55be6b88a90a2.tar.xz | |
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
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/Thunk16.asm')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/Thunk16.asm | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/MdePkg/Library/BaseLib/X64/Thunk16.asm b/MdePkg/Library/BaseLib/X64/Thunk16.asm index 8b208fdb58..01051341f6 100644 --- a/MdePkg/Library/BaseLib/X64/Thunk16.asm +++ b/MdePkg/Library/BaseLib/X64/Thunk16.asm @@ -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
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