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
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/X64/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
@@ -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