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
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@@ -3,7 +3,7 @@
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
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; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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@@ -282,7 +282,7 @@ InternalAsmThunk16 PROC USES rbp rbx rsi rdi
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and eax, 7ffffffeh ; clear PE, PG bits
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mov rbp, cr4
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mov [rcx], ebp ; save CR4 in SavedCr4
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and ebp, 300h ; clear all but PCE and OSFXSR bits
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and ebp, NOT 30h ; clear PAE, PSE bits
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mov esi, r8d ; esi <- 16-bit stack segment
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DB 6ah, DATA32 ; push DATA32
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pop rdx ; rdx <- 32-bit data segment selector
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