MdeModulePkg/Include/Guid/VariableIndexTable.h

   1 /** @file
   2   The variable data structures are related to EDK II-specific implementation of UEFI variables.
   3   VariableFormat.h defines variable data headers and variable storage region headers.
   4
   5 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #ifndef __VARIABLE_INDEX_TABLE_H__
  11 #define __VARIABLE_INDEX_TABLE_H__
  12
  13 typedef struct {
  14   VARIABLE_HEADER *CurrPtr;
  15   VARIABLE_HEADER *EndPtr;
  16   VARIABLE_HEADER *StartPtr;
  17 } VARIABLE_POINTER_TRACK;
  18
  19 #define VARIABLE_INDEX_TABLE_VOLUME 122
  20
  21 #define EFI_VARIABLE_INDEX_TABLE_GUID \
  22   { 0x8cfdb8c8, 0xd6b2, 0x40f3, { 0x8e, 0x97, 0x02, 0x30, 0x7c, 0xc9, 0x8b, 0x7c } }
  23
  24 extern EFI_GUID gEfiVariableIndexTableGuid;
  25
  26 ///
  27 /// Use this data structure to store variable-related info, which can decrease
  28 /// the cost of access to NV.
  29 ///
  30 typedef struct {
  31   UINT16          Length;
  32   UINT16          GoneThrough;
  33   VARIABLE_HEADER *EndPtr;
  34   VARIABLE_HEADER *StartPtr;
  35   ///
  36   /// This field is used to store the distance of two neighbouring VAR_ADDED type variables.
  37   /// The meaning of the field is implement-dependent.
  38   UINT16          Index[VARIABLE_INDEX_TABLE_VOLUME];
  39 } VARIABLE_INDEX_TABLE;
  40
  41 #endif // __VARIABLE_INDEX_TABLE_H__