MdeModulePkg/Include/Guid/SystemNvDataGuid.h

   1 /** @file
   2   This file defines NvDataFv GUID and FTW working block structure header.
   3   This guid can be used as FileSystemGuid in EFI_FIRMWARE_VOLUME_HEADER if
   4   this FV image contains NV data, such as NV variable data.
   5   This guid can also be used as the signature of FTW working block header.
   6
   7 Copyright (c) 2006 - 2009, Intel Corporation
   8 All rights reserved. This program and the accompanying materials
   9 are licensed and made available under the terms and conditions of the BSD License
  10 which accompanies this distribution.  The full text of the license may be found at
  11 http://opensource.org/licenses/bsd-license.php
  12
  13 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15
  16 **/
  17
  18 #ifndef __SYSTEM_NV_DATA_GUID_H__
  19 #define __SYSTEM_NV_DATA_GUID_H__
  20
  21 #define EFI_SYSTEM_NV_DATA_FV_GUID \
  22   {0xfff12b8d, 0x7696, 0x4c8b, {0xa9, 0x85, 0x27, 0x47, 0x7, 0x5b, 0x4f, 0x50} }
  23
  24 ///
  25 /// NvDataFv GUID used as the signature of FTW working block header.
  26 ///
  27 extern EFI_GUID gEfiSystemNvDataFvGuid;
  28
  29 #define WORKING_BLOCK_VALID   0x1
  30 #define WORKING_BLOCK_INVALID 0x2
  31
  32 ///
  33 /// EDKII Fault tolerant working block header
  34 /// The header is immediately followed by the write queue data.
  35 ///
  36 typedef struct {
  37   ///
  38   /// System Non Volatile FV Guid
  39   ///
  40   EFI_GUID  Signature;
  41   ///
  42   /// 32bit CRC caculated for this header
  43   ///
  44   UINT32    Crc;
  45   ///
  46   /// Working block valid bit
  47   ///
  48   UINT8     WorkingBlockValid : 1;
  49   UINT8     WorkingBlockInvalid : 1;
  50   UINT8     Reserved : 6;
  51   UINT8     Reserved3[3];
  52   ///
  53   /// Total size of the following write queue range.
  54   ///
  55   UINT64    WriteQueueSize;
  56   ///
  57   /// Write Queue data
  58   /// UINT8                WriteQueue[WriteQueueSize];
  59   ///
  60 } EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER;
  61
  62 #endif