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author | jyao1 <jyao1> | 2014-07-24 06:52:43 +0000 |
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committer | jyao1 <jyao1@6f19259b-4bc3-4df7-8a09-765794883524> | 2014-07-24 06:52:43 +0000 |
commit | a33a2f62218e6e49a25d63474b7fe423d8ee4b71 (patch) | |
tree | ca8e4dd491a71f4a7e36fbc17c5e95276d555b43 /IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/Stack.asm | |
parent | 34717ef034ed275a15683dafd29cb518af50fff0 (diff) | |
download | edk2-a33a2f62218e6e49a25d63474b7fe423d8ee4b71.tar.gz edk2-a33a2f62218e6e49a25d63474b7fe423d8ee4b71.tar.bz2 edk2-a33a2f62218e6e49a25d63474b7fe423d8ee4b71.zip |
Add IntelFspWrapper to support boot EDKII on FSP bin.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed off by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed by: Ravi Rangarajan <ravi.p.rangarajan@intel.com>
Reviewed by: Maurice Ma <maurice.ma@intel.com>
Reviewed by: Giri Mudusuru <giri.p.mudusuru@intel.com>
Reviewed by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15676 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/Stack.asm')
-rw-r--r-- | IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/Stack.asm | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/Stack.asm b/IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/Stack.asm new file mode 100644 index 0000000000..f96a55f040 --- /dev/null +++ b/IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/Stack.asm @@ -0,0 +1,82 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2014, 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.
+;
+; Abstract:
+;
+; Switch the stack from temporary memory to permenent memory.
+;
+;------------------------------------------------------------------------------
+
+ .586p
+ .model flat,C
+ .code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; SecSwitchStack (
+; UINT32 TemporaryMemoryBase,
+; UINT32 PermenentMemoryBase
+; );
+;------------------------------------------------------------------------------
+SecSwitchStack PROC
+ ;
+ ; Save three register: eax, ebx, ecx
+ ;
+ push eax
+ push ebx
+ push ecx
+ push edx
+
+ ;
+ ; !!CAUTION!! this function address's is pushed into stack after
+ ; migration of whole temporary memory, so need save it to permenent
+ ; memory at first!
+ ;
+
+ mov ebx, [esp + 20] ; Save the first parameter
+ mov ecx, [esp + 24] ; Save the second parameter
+
+ ;
+ ; Save this function's return address into permenent memory at first.
+ ; Then, Fixup the esp point to permenent memory
+ ;
+ mov eax, esp
+ sub eax, ebx
+ add eax, ecx
+ mov edx, dword ptr [esp] ; copy pushed register's value to permenent memory
+ mov dword ptr [eax], edx
+ mov edx, dword ptr [esp + 4]
+ mov dword ptr [eax + 4], edx
+ mov edx, dword ptr [esp + 8]
+ mov dword ptr [eax + 8], edx
+ mov edx, dword ptr [esp + 12]
+ mov dword ptr [eax + 12], edx
+ mov edx, dword ptr [esp + 16] ; Update this function's return address into permenent memory
+ mov dword ptr [eax + 16], edx
+ mov esp, eax ; From now, esp is pointed to permenent memory
+
+ ;
+ ; Fixup the ebp point to permenent memory
+ ;
+ mov eax, ebp
+ sub eax, ebx
+ add eax, ecx
+ mov ebp, eax ; From now, ebp is pointed to permenent memory
+
+ pop edx
+ pop ecx
+ pop ebx
+ pop eax
+ ret
+SecSwitchStack ENDP
+
+ END
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