Add SMM Variable implementation.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11151 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Include/Protocol/SmmFirmwareVolumeBlock.h

@@ -0,0 +1,36 @@
+/** @file
+  SMM Firmware Volume Block protocol is related to EDK II-specific implementation of
+  FVB driver, provides control over block-oriented firmware devices and is intended 
+  to use in the EFI SMM environment.
+
+Copyright (c) 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 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 __SMM_FIRMWARE_VOLUME_BLOCK_H__
+#define __SMM_FIRMWARE_VOLUME_BLOCK_H__
+
+#include <Protocol/FirmwareVolumeBlock.h>
+
+#define EFI_SMM_FIRMWARE_VOLUME_BLOCK_PROTOCOL_GUID \
+  { \
+    0xf52fc9ff, 0x8025, 0x4432, { 0xa5, 0x3b, 0xb4, 0x7b, 0x5e, 0x9, 0xdb, 0xf9 } \
+  }
+
+//
+// SMM Firmware Volume Block protocol structure is the same as Firmware Volume Block 
+// protocol. The SMM one is intend to run in SMM environment, which means it can be  
+// used by SMM drivers after ExitPmAuth. 
+// 
+typedef EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL EFI_SMM_FIRMWARE_VOLUME_BLOCK_PROTOCOL;
+
+extern EFI_GUID gEfiSmmFirmwareVolumeBlockProtocolGuid;
+
+#endif