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diff --git a/Core/MdeModulePkg/Include/Guid/CapsuleVendor.h b/Core/MdeModulePkg/Include/Guid/CapsuleVendor.h
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+/** @file
+  This file defines:
+  * the capsule vendor GUID for capsule variables and the HOB.
+  * the capsule variable name.
+  * the capsule GUID HOB data structure.
+  The capsule HOB and variable can be used to store the capsule image start address and length.
+  They are used by EDKII implementation of capsule update across a system reset.
+  
+  @par Note: EDKII implementation of capsule updating has discarded this capsule GUID HOB data
+             structure and used one UEFI Capsule HOB (defined in PI Specification 1.2) instead.
+
+Copyright (c) 2006 - 2011, 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 that 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 __EFI_CAPSULE_VENDOR_GUID_H__
+#define __EFI_CAPSULE_VENDOR_GUID_H__
+
+///
+/// This guid is used as a variable GUID for the capsule variable 
+/// if the capsule pointer is passed through reset via a variable.
+///
+/// This guid is also used as a hob GUID for the capsule data 
+/// when the capsule pointer is passed from PEI phase to DXE phase.
+///
+#define EFI_CAPSULE_VENDOR_GUID  \
+  { 0x711C703F, 0xC285, 0x4B10, { 0xA3, 0xB0, 0x36, 0xEC, 0xBD, 0x3C, 0x8B, 0xE2 } }
+
+///
+/// Name of capsule variable.
+/// 
+#define EFI_CAPSULE_VARIABLE_NAME L"CapsuleUpdateData"
+
+///
+/// The data structure of the capsule guid hob entry.
+/// Note: EDKII implementation has discarded this structure and used 
+///       UEFI_CAPSULE_HOB instead.
+///
+typedef struct {
+  EFI_PHYSICAL_ADDRESS BaseAddress;  ///< Capsule data start address.
+  UINT32 Length;                     ///< Length of capsule data.
+} CAPSULE_HOB_INFO;
+
+//
+// The variable describes the long mode buffer used by IA32 Capsule PEIM
+// to call X64 CapsuleCoalesce code to handle >4GB capsule blocks.
+//
+#define EFI_CAPSULE_LONG_MODE_BUFFER_NAME L"CapsuleLongModeBuffer"
+
+typedef struct {
+  EFI_PHYSICAL_ADDRESS   PageTableAddress;
+  EFI_PHYSICAL_ADDRESS   StackBaseAddress;
+  UINT64                 StackSize;
+} EFI_CAPSULE_LONG_MODE_BUFFER;
+
+extern EFI_GUID gEfiCapsuleVendorGuid;
+
+#endif // #ifndef _EFI_CAPSULE_VENDOR_GUID_H_