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diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Ipf/IpfThunk.h b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Ipf/IpfThunk.h
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+/** @file
+
+Copyright (c) 2007 - 2010, 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.
+
+**/
+
+#ifndef _IPF_THUNK_H_
+#define _IPF_THUNK_H_
+
+#include "LegacyBiosInterface.h"
+#include <IndustryStandard/Sal.h>
+
+/**
+ Template of real mode code.
+
+ @param CodeStart Start address of code.
+ @param CodeEnd End address of code
+ @param ReverseThunkStart Start of reverse thunk.
+ @param IntThunk Low memory thunk.
+
+**/
+VOID
+RealModeTemplate (
+ OUT UINTN *CodeStart,
+ OUT UINTN *CodeEnd,
+ OUT UINTN *ReverseThunkStart,
+ LOW_MEMORY_THUNK *IntThunk
+ );
+
+/**
+ Register physical address of Esal Data Area
+
+ @param ReverseThunkCodeAddress Reverse Thunk Address
+ @param IntThunkAddress IntThunk Address
+
+ @retval EFI_SUCCESS ESAL data area set successfully.
+
+**/
+EFI_STATUS
+EsalSetSalDataArea (
+ IN UINTN ReverseThunkCodeAddress,
+ IN UINTN IntThunkAddress
+ );
+
+/**
+ Get address of reverse thunk.
+
+ @retval EFI_SAL_SUCCESS Address of reverse thunk returned successfully.
+
+**/
+SAL_RETURN_REGS
+EsalGetReverseThunkAddress (
+ VOID
+ );
+
+typedef struct {
+ UINT32 Eax; // 0
+ UINT32 Ecx; // 4
+ UINT32 Edx; // 8
+ UINT32 Ebx; // 12
+ UINT32 Esp; // 16
+ UINT32 Ebp; // 20
+ UINT32 Esi; // 24
+ UINT32 Edi; // 28
+ UINT32 Eflag; // 32
+ UINT32 Eip; // 36
+ UINT16 Cs; // 40
+ UINT16 Ds; // 42
+ UINT16 Es; // 44
+ UINT16 Fs; // 46
+ UINT16 Gs; // 48
+ UINT16 Ss; // 50
+} IPF_DWORD_REGS;
+
+/**
+ Entrypoint of IA32 code.
+
+ @param CallTypeData Data of call type
+ @param DwordRegister Register set of IA32 general registers
+ and segment registers
+ @param StackPointer Stack pointer.
+ @param StackSize Size of stack.
+
+**/
+VOID
+EfiIaEntryPoint (
+ UINT64 CallTypeData,
+ IPF_DWORD_REGS *DwordRegister,
+ UINT64 StackPointer,
+ UINT64 StackSize
+ );
+
+#endif