audk/EdkModulePkg/Include/Common/WorkingBlockHeader.h

/*++

Copyright (c) 2006, 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.             

Module Name:

  EfiWorkingBlockHeader.h

Abstract:

  Defines data structure that is the headers found at the runtime 
  updatable firmware volumes, such as the FileSystemGuid of the 
  working block, the header structure of the variable block, FTW
  working block, or event log block.

--*/

#ifndef _EFI_WORKING_BLOCK_HEADER_H_
#define _EFI_WORKING_BLOCK_HEADER_H_

//
// EFI Fault tolerant working block header
// The header is immediately followed by the write queue.
//
typedef struct {
  EFI_GUID  Signature;
  UINT32    Crc;
  UINT8     WorkingBlockValid : 1;
  UINT8     WorkingBlockInvalid : 1;
#define WORKING_BLOCK_VALID   0x1
#define WORKING_BLOCK_INVALID 0x2
  UINT8     Reserved : 6;
  UINT8     Reserved3[3];
  UINT32    WriteQueueSize;
  //
  // UINT8                WriteQueue[WriteQueueSize];
  //
} EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER;

#endif