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diff --git a/BaseTools/Source/C/Include/Guid/PiFirmwareFileSystem.h b/BaseTools/Source/C/Include/Guid/PiFirmwareFileSystem.h
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+/** @file
+  Guid used to define the Firmware File System. See PI spec volume 3 for more
+  details.
+
+  Copyright (c) 2006 - 2008, 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.
+
+  File Name:  PiFirmwareFileSystem.h
+
+  @par Revision Reference:
+  Guids defined in PI Spec Volume 3
+
+**/
+
+#ifndef __FIRMWARE_FILE_SYSTEM2_GUID_H__
+#define __FIRMWARE_FILE_SYSTEM2_GUID_H__
+
+//
+// GUIDs defined by the PI specification.
+//
+#define EFI_FIRMWARE_FILE_SYSTEM2_GUID \
+  { \
+    0x8c8ce578, 0x8a3d, 0x4f1c, {0x99, 0x35, 0x89, 0x61, 0x85, 0xc3, 0x2d, 0xd3 } \
+  }
+
+#define EFI_FFS_VOLUME_TOP_FILE_GUID \
+  { \
+    0x1BA0062E, 0xC779, 0x4582, {0x85, 0x66, 0x33, 0x6A, 0xE8, 0xF7, 0x8F, 0x09 } \
+  }
+
+extern EFI_GUID gEfiFirmwareFileSystem2Guid;
+extern EFI_GUID gEfiFirmwareVolumeTopFileGuid;
+
+#endif