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diff --git a/MdePkg/Include/Library/PeCoffExtraActionLib.h b/MdePkg/Include/Library/PeCoffExtraActionLib.h
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+/** @file
+  Provides services to perform additional actions to relocate and unload
+  PE/Coff image for some environment specific purpose say for souce level debug.
+
+  Copyright (c) 2006 - 2008, Intel Corporation<BR>
+  All rights reserved. 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 __PE_COFF_EXTRA_ACTION_LIB_H__
+#define __PE_COFF_EXTRA_ACTION_LIB_H__
+#include <Library/PeCoffLib.h>
+/**
+  Applies additional actions to relocate fixups to a PE/COFF image.
+
+  Generally this function is called after sucessfully Applying relocation fixups 
+  to a PE/COFF image for some specicial purpose. 
+  As a example, For NT32 emulator, the function should be implemented and called
+  to support source level debug.  
+  
+  @param  ImageContext        Pointer to the image context structure that describes the PE/COFF
+                              image that is being relocated.
+
+**/
+VOID
+EFIAPI
+PeCoffLoaderRelocateImageExtraAction (
+  IN OUT PE_COFF_LOADER_IMAGE_CONTEXT  *ImageContext
+  );
+
+/**
+  Unloads a loaded PE/COFF image from memory and releases its taken resource.
+  
+  Releases any environment specific resources that were allocated when the image 
+  specified by ImageContext was loaded using PeCoffLoaderLoadImage(). 
+  For NT32 emulator, the PE/COFF image loaded by system needs to release.
+  For real platform, the PE/COFF image loaded by Core doesn't needs to be unloaded, 
+  
+  If ImageContext is NULL, then ASSERT().
+  
+  @param  ImageContext              Pointer to the image context structure that describes the PE/COFF
+                                    image to be unloaded.
+
+**/
+VOID
+EFIAPI
+PeCoffLoaderUnloadImageExtraAction (
+  IN OUT PE_COFF_LOADER_IMAGE_CONTEXT  *ImageContext
+  );
+#endif