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/Ia32/Thunk16.S | |
| 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/Ia32/Thunk16.S')
| -rw-r--r-- | MdePkg/Library/BaseLib/Ia32/Thunk16.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/Thunk16.S b/MdePkg/Library/BaseLib/Ia32/Thunk16.S index 0555cf1bfd..8356c5a1c7 100644 --- a/MdePkg/Library/BaseLib/Ia32/Thunk16.S +++ b/MdePkg/Library/BaseLib/Ia32/Thunk16.S @@ -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)
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