audk/IntelFrameworkPkg/Include/Guid/SmramMemoryReserve.h

/** @file
  Definition of GUIDed HOB for reserving SMRAM regions.

  This file defines:
  * the GUID used to identify the GUID HOB for reserving SMRAM regions.
  * the data structure of SMRAM descriptor to describe SMRAM candidate regions
  * values of state of SMRAM candidate regions
  * the GUID specific data structure of HOB for reserving SMRAM regions.
  This GUIDed HOB can be used to convey the existence of the T-SEG reservation and H-SEG usage

Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

  @par Revision Reference:
  GUIDs defined in SmmCis spec version 0.9.

**/

#ifndef _EFI_SMM_PEI_SMRAM_MEMORY_RESERVE_H_
#define _EFI_SMM_PEI_SMRAM_MEMORY_RESERVE_H_

#define EFI_SMM_PEI_SMRAM_MEMORY_RESERVE \
  { \
    0x6dadf1d1, 0xd4cc, 0x4910, {0xbb, 0x6e, 0x82, 0xb1, 0xfd, 0x80, 0xff, 0x3d } \
  }

/**
* GUID specific data structure of HOB for reserving SMRAM regions.
*
* Inconsistent with specification here:
* EFI_HOB_SMRAM_DESCRIPTOR_BLOCK has been changed to EFI_SMRAM_HOB_DESCRIPTOR_BLOCK.
* This inconsistency is kept in code in order for backward compatibility.
**/
typedef struct {
  ///
  /// Designates the number of possible regions in the system
  /// that can be usable for SMRAM.
  ///
  /// Inconsistent with specification here:
  /// In Framework SMM CIS 0.91 specification, it defines the field type as UINTN.
  /// However, HOBs are supposed to be CPU neutral, so UINT32 should be used instead.
  ///
  UINT32                NumberOfSmmReservedRegions;
  ///
  /// Used throughout this protocol to describe the candidate
  /// regions for SMRAM that are supported by this platform.
  ///
  EFI_SMRAM_DESCRIPTOR  Descriptor[1];
} EFI_SMRAM_HOB_DESCRIPTOR_BLOCK;

extern EFI_GUID gEfiSmmPeiSmramMemoryReserveGuid;

#endif