UefiPayloadPkg/Include/Guid/SmmS3CommunicationInfoGuid.h

/** @file
  This file defines the SMM S3 communication hob structure.

  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef PAYLOAD_S3_COMMUNICATION_GUID_H_
#define PAYLOAD_S3_COMMUNICATION_GUID_H_

extern EFI_GUID  gS3CommunicationGuid;

#pragma pack(1)

typedef struct {
  EFI_SMRAM_DESCRIPTOR    CommBuffer;
  BOOLEAN                 PldAcpiS3Enable;
} PLD_S3_COMMUNICATION;

///
/// The information below is used for communication between bootloader and payload.
/// It is used to save/store some registers in S3 path
///
/// This region exists only when gEfiAcpiVariableGuid HOB exist.
/// when PLD_S3_INFO.PldAcpiS3Enable is false, the communication buffer is defined as below.
///

typedef struct {
  UINT32    ApicId;
  UINT32    SmmBase;
} CPU_SMMBASE;

typedef struct {
  UINT8          SwSmiData;
  UINT8          SwSmiTriggerValue;
  UINT16         Reserved;
  UINT32         CpuCount;
  CPU_SMMBASE    SmmBase[0];
} SMM_S3_INFO;

//
// Payload would save this structure to S3 communication area in normal boot.
// In S3 path, bootloader need restore SMM base and writie IO port 0xB2 with SwSmiTriggerValue
// to trigger SMI to let payload to restore S3.
//
typedef struct {
  EFI_HOB_GUID_TYPE    Header;
  SMM_S3_INFO          S3Info;
} PLD_TO_BL_SMM_INFO;

#pragma pack()

#endif