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diff --git a/BaseTools/Source/C/Include/IndustryStandard/MemoryMappedConfigurationSpaceAccessTable.h b/BaseTools/Source/C/Include/IndustryStandard/MemoryMappedConfigurationSpaceAccessTable.h
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+++ b/BaseTools/Source/C/Include/IndustryStandard/MemoryMappedConfigurationSpaceAccessTable.h
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+/** @file
+  ACPI memory mapped configuration space access table definition, defined at 
+  in the PCI Firmware Specification, version 3.0 draft version 0.5.
+  Specification is available at http://www.pcisig.com.
+
+  Copyright (c) 2006 - 2008, Intel Corporation.  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.
+
+  File Name: MemoryMappedConfigurationSpaceAccessTable.h
+
+**/
+
+#ifndef _MEMORY_MAPPED_CONFIGURATION_SPACE_ACCESS_TABLE_H_
+#define _MEMORY_MAPPED_CONFIGURATION_SPACE_ACCESS_TABLE_H_
+
+//
+// Ensure proper structure formats
+//
+#pragma pack(1)
+//
+// Memory Mapped Configuration Space Access Table (MCFG)
+// This table is a basic description table header followed by
+// a number of base address allocation structures.
+//
+typedef struct {
+  UINT64  BaseAddress;
+  UINT16  PciSegmentGroupNumber;
+  UINT8   StartBusNumber;
+  UINT8   EndBusNumber;
+  UINT32  Reserved;
+} EFI_ACPI_MEMORY_MAPPED_ENHANCED_CONFIGURATION_SPACE_BASE_ADDRESS_ALLOCATION_STRUCTURE;
+
+//
+// MCFG Revision (defined in spec)
+//
+#define EFI_ACPI_MEMORY_MAPPED_CONFIGURATION_SPACE_ACCESS_TABLE_REVISION  0x01
+
+#pragma pack()
+
+#endif