Now, Transition32FlatTo64Flat calls SetCr3ForPageTables64
which is located in Ia32/PageTables64.asm.
This change is required so OVMF can replace the code in
Ia32/PageTables64.asm with code that generates page tables in
RAM.
Note: Since this change does not impact the functionality of the
current VTF0 binaries, they are not being updated. The resulting
new binaries were tested to verify there is no regression.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.jus...@intel.com>
---
.../ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm | 5 ++--
UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm | 30 ++++++++++++++++++++
UefiCpuPkg/ResetVector/Vtf0/ResetVectorCode.asm | 3 +-
3 files changed, 34 insertions(+), 4 deletions(-)
create mode 100644 UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm
b/UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm
index 9eba864..62e71da 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm
+++ b/UefiCpuPkg/ResetVector/Vtf0/Ia32/Flat32ToFlat64.asm
@@ -2,7 +2,7 @@
; @file
; Transition from 32 bit flat protected mode into 64 bit flat protected mode
;
-; Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2008 - 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
@@ -20,8 +20,7 @@ BITS 32
;
Transition32FlatTo64Flat:
- mov eax, ((ADDR_OF_START_OF_RESET_CODE & ~0xfff) - 0x1000)
- mov cr3, eax
+ OneTimeCall SetCr3ForPageTables64
mov eax, cr4
bts eax, 5 ; enable PAE
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm
b/UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm
new file mode 100644
index 0000000..0cfcbae
--- /dev/null
+++ b/UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm
@@ -0,0 +1,30 @@
+;------------------------------------------------------------------------------
+; @file
+; Sets the CR3 register for 64-bit paging
+;
+; Copyright (c) 2008 - 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
+; http://opensource.org/licenses/bsd-license.php
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+BITS 32
+
+;
+; Modified: EAX
+;
+SetCr3ForPageTables64:
+
+ ;
+ ; These pages are built into the ROM image by Tools/FixupForRawSection.py
+ ;
+ mov eax, ((ADDR_OF_START_OF_RESET_CODE & ~0xfff) - 0x1000)
+ mov cr3, eax
+
+ OneTimeCallRet SetCr3ForPageTables64
+
diff --git a/UefiCpuPkg/ResetVector/Vtf0/ResetVectorCode.asm
b/UefiCpuPkg/ResetVector/Vtf0/ResetVectorCode.asm
index 96f686b..052c821 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/ResetVectorCode.asm
+++ b/UefiCpuPkg/ResetVector/Vtf0/ResetVectorCode.asm
@@ -2,7 +2,7 @@
; @file
; This file includes all other code files to assemble the reset vector code
;
-; Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2008 - 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
@@ -41,6 +41,7 @@
%ifdef ARCH_X64
%include "Ia32/Flat32ToFlat64.asm"
+%include "Ia32/PageTables64.asm"
%endif
%include "Ia16/Real16ToFlat32.asm"
--
1.7.10.4
------------------------------------------------------------------------------
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