UefiPayloadPkg: Add bootloader SMM support module

This module is only used for SMM S3 support for the bootloader that
doesn't support SMM.
The payload would save SMM rebase info to SMM communication area in
normal boot and expect the bootloader in S3 path to rebase the SMM
and trigger SMI by writing 0xB2 port with the given value from SMM
communication area. The payload SMM handler would get chance to
restore some registers in S3 path.

Signed-off-by: Guo Dong <guo.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Maurice Ma <maurice.ma@intel.com>
Cc: Benjamin You <benjamin.you@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Benjamin You <benjamin.you@intel.com>

5 files changed, 576 insertions, 0 deletions

diff --git a/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.c b/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.c
new file mode 100644
index 0000000000..2283b6b4af
--- /dev/null
+++ b/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.c
@@ -0,0 +1,431 @@
+/** @file

+  This driver is used for SMM S3 support for the bootloader that

+  doesn't support SMM.

+  The payload would save SMM rebase info to SMM communication area.

+  The bootloader is expected to rebase the SMM and trigger SMI by

+  writting 0xB2 port with given value from SMM communication area.

+  The paylaod SMM handler got chance to restore regs in S3 path.

+

+  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>

+  SPDX-License-Identifier: BSD-2-Clause-Patent

+

+**/

+

+#include <BlSupportSmm.h>

+

+PLD_S3_COMMUNICATION              mPldS3Hob;

+EFI_SMRAM_HOB_DESCRIPTOR_BLOCK    *mSmramHob         = NULL;

+PLD_SMM_REGISTERS                 *mSmmRegisterHob   = NULL;;

+UINT64                            mSmmFeatureControl = 0;

+

+/**

+  Save SMM rebase and SMI handler information to SMM communication area

+

+  The function detects SMM communication region for boot loader, if it is detected, it

+  will save SMM rebase information and S3 SMI handler information to SMM communication

+  region. Bootloader should consume these information in S3 path to restore smm base,

+  and write the 0xB2 port to trigger SMI so that payload could resume S3 registers.

+

+  @param[in] BlSwSmiHandlerInput   Value written to 0xB2 to trigger SMI handler.

+

+  @retval    EFI_SUCCESS           Save SMM info success.

+  @retval    Others                Failed to save SMM info.

+**/

+EFI_STATUS

+SaveSmmInfoForS3 (

+  IN UINT8                         BlSwSmiHandlerInput

+  )

+{

+  EFI_STATUS                       Status;

+  EFI_PROCESSOR_INFORMATION        ProcessorInfo;

+  EFI_MP_SERVICES_PROTOCOL         *MpService;

+  CPU_SMMBASE                      *SmmBaseInfo;

+  PLD_TO_BL_SMM_INFO               *PldSmmInfo;

+  UINTN                            Index;

+

+  PldSmmInfo = (PLD_TO_BL_SMM_INFO *)(UINTN)mPldS3Hob.CommBuffer.PhysicalStart;

+  PldSmmInfo->Header.Header.HobLength = (UINT16)(sizeof (PLD_TO_BL_SMM_INFO) + gSmst->NumberOfCpus * sizeof (CPU_SMMBASE));

+  for (Index = 0; Index < mSmramHob->NumberOfSmmReservedRegions; Index++) {

+    if ((mPldS3Hob.CommBuffer.PhysicalStart >= mSmramHob->Descriptor[Index].PhysicalStart) &&

+        (mPldS3Hob.CommBuffer.PhysicalStart <  mSmramHob->Descriptor[Index].PhysicalStart + mSmramHob->Descriptor[Index].PhysicalSize)) {

+      break;

+    }

+  }

+  if (Index == mSmramHob->NumberOfSmmReservedRegions) {

+    return EFI_NOT_FOUND;

+  }

+

+  //

+  // Make sure the dedicated region for SMM info communication whose attribute is "allocated" (i.e., excluded from SMM memory service)

+  //

+  if ((mSmramHob->Descriptor[Index].RegionState & EFI_ALLOCATED) == 0) {

+    DEBUG ((DEBUG_ERROR, "SMM communication region not set to EFI_ALLOCATED\n"));

+    return EFI_INVALID_PARAMETER;

+  }

+

+  if (((UINTN)PldSmmInfo + PldSmmInfo->Header.Header.HobLength) > (mSmramHob->Descriptor[Index].PhysicalStart + mSmramHob->Descriptor[Index].PhysicalSize)) {

+    DEBUG ((DEBUG_ERROR, "SMM communication buffer (0x%x) is too small.\n", (UINTN)PldSmmInfo + PldSmmInfo->Header.Header.HobLength));

+    return EFI_BUFFER_TOO_SMALL;

+  }

+

+  CopyGuid (&PldSmmInfo->Header.Name, &gS3CommunicationGuid);

+  PldSmmInfo->Header.Header.HobType    = EFI_HOB_TYPE_GUID_EXTENSION;

+  PldSmmInfo->S3Info.SwSmiTriggerValue = BlSwSmiHandlerInput;

+

+  //

+  // Save APIC ID and SMM base

+  //

+  Status = gBS->LocateProtocol (&gEfiMpServiceProtocolGuid, NULL, (VOID **)&MpService);

+  if (EFI_ERROR(Status)) {

+    return Status;

+  }

+  PldSmmInfo->S3Info.CpuCount         = (UINT32)gSmst->NumberOfCpus;

+  SmmBaseInfo = &PldSmmInfo->S3Info.SmmBase[0];

+  for (Index = 0; Index < gSmst->NumberOfCpus; Index++) {

+    Status = MpService->GetProcessorInfo (MpService, Index, &ProcessorInfo);

+    if (EFI_ERROR(Status)) {

+      return Status;

+    }

+

+    SmmBaseInfo->ApicId  = (UINT32)(UINTN)ProcessorInfo.ProcessorId;

+    SmmBaseInfo->SmmBase = (UINT32)(UINTN)gSmst->CpuSaveState[Index] - SMRAM_SAVE_STATE_MAP_OFFSET;

+    DEBUG ((DEBUG_INFO, "CPU%d ID:%02X Base: %08X\n", Index, SmmBaseInfo->ApicId, SmmBaseInfo->SmmBase));

+    SmmBaseInfo++;

+  }

+

+  return EFI_SUCCESS;

+}

+

+

+/**

+  Get specified SMI register based on given register ID

+

+  @param[in]  Id           The register ID to get.

+

+  @retval NULL             The register is not found

+  @return smi register

+

+**/

+PLD_GENERIC_REGISTER *

+GetRegisterById (

+  UINT64                Id

+  )

+{

+  UINT32                Index;

+

+  for (Index = 0; Index < mSmmRegisterHob->Count; Index++) {

+    if (mSmmRegisterHob->Registers[Index].Id == Id) {

+      return &mSmmRegisterHob->Registers[Index];

+    }

+  }

+  return NULL;

+}

+

+/**

+  Set SMM SMI Global enable lock

+

+**/

+VOID

+LockSmiGlobalEn (

+  VOID

+  )

+{

+  PLD_GENERIC_REGISTER       *SmiLockReg;

+

+    DEBUG ((DEBUG_ERROR, "LockSmiGlobalEn .....\n"));

+

+  SmiLockReg = GetRegisterById (REGISTER_ID_SMI_GBL_EN_LOCK);

+  if (SmiLockReg == NULL) {

+    DEBUG ((DEBUG_ERROR, "SMI global enable lock reg not found.\n"));

+    return;

+  }

+

+  //

+  // Set SMM SMI lock in S3 path

+  //

+  if ((SmiLockReg->Address.AccessSize       == EFI_ACPI_3_0_DWORD) &&

+      (SmiLockReg->Address.Address          != 0) &&

+      (SmiLockReg->Address.RegisterBitWidth == 1) &&

+      (SmiLockReg->Address.AddressSpaceId   == EFI_ACPI_3_0_SYSTEM_MEMORY) &&

+      (SmiLockReg->Value == 1)) {

+    DEBUG ((DEBUG_ERROR, "LockSmiGlobalEn ....is locked\n"));

+

+    MmioOr32 ((UINT32)SmiLockReg->Address.Address, 1 << SmiLockReg->Address.RegisterBitOffset);

+  } else {

+    DEBUG ((DEBUG_ERROR, "Unexpected SMM SMI lock register, need enhancement here.\n"));

+  }

+}

+

+/**

+  Check and set SMM feature lock bit and code check enable bit

+  in S3 path.

+

+**/

+VOID

+SmmFeatureLockOnS3 (

+  VOID

+  )

+{

+

+  if (mSmmFeatureControl != 0) {

+    return;

+  }

+

+  mSmmFeatureControl = AsmReadMsr64(MSR_SMM_FEATURE_CONTROL);

+  if ((mSmmFeatureControl & 0x5) != 0x5) {

+    //

+    // Set Lock bit [BIT0] for this register and SMM code check enable bit [BIT2]

+    //

+    AsmWriteMsr64 (MSR_SMM_FEATURE_CONTROL, mSmmFeatureControl | 0x5);

+  }

+  mSmmFeatureControl = AsmReadMsr64(MSR_SMM_FEATURE_CONTROL);

+}

+

+

+

+/**

+  Function to program SMRR base and mask.

+

+  @param[in] ProcedureArgument  Pointer to SMRR_BASE_MASK structure.

+**/

+VOID

+SetSmrr (

+  IN VOID                   *ProcedureArgument

+  )

+{

+  if (ProcedureArgument != NULL) {

+    AsmWriteMsr64 (MSR_IA32_SMRR_PHYSBASE, ((SMRR_BASE_MASK *)ProcedureArgument)->Base);

+    AsmWriteMsr64 (MSR_IA32_SMRR_PHYSMASK, ((SMRR_BASE_MASK *)ProcedureArgument)->Mask);

+  }

+}

+

+/**

+  Set SMRR in S3 path.

+

+**/

+VOID

+SetSmrrOnS3 (

+  VOID

+  )

+{

+  EFI_STATUS            Status;

+  SMRR_BASE_MASK        Arguments;

+  UINTN                 Index;

+  UINT32                SmmBase;

+  UINT32                SmmSize;

+

+  if ((AsmReadMsr64 (MSR_IA32_SMRR_PHYSBASE) != 0) && ((AsmReadMsr64 (MSR_IA32_SMRR_PHYSMASK) & BIT11) != 0)) {

+    return;

+  }

+

+  SmmBase = (UINT32)(UINTN)mSmramHob->Descriptor[0].PhysicalStart;

+  SmmSize = (UINT32)(UINTN)mSmramHob->Descriptor[0].PhysicalSize;

+  if ((mSmramHob->NumberOfSmmReservedRegions > 2) || (mSmramHob->NumberOfSmmReservedRegions == 0)) {

+    DEBUG ((DEBUG_ERROR, "%d SMM ranges are not supported.\n", mSmramHob->NumberOfSmmReservedRegions));

+    return;

+  } else if (mSmramHob->NumberOfSmmReservedRegions == 2) {

+    if ((mSmramHob->Descriptor[1].PhysicalStart + mSmramHob->Descriptor[1].PhysicalSize) == SmmBase){

+      SmmBase = (UINT32)(UINTN)mSmramHob->Descriptor[1].PhysicalStart;

+    } else if (mSmramHob->Descriptor[1].PhysicalStart != (SmmBase + SmmSize)) {

+      DEBUG ((DEBUG_ERROR, "Two SMM regions are not continous.\n"));

+      return;

+    }

+    SmmSize += (UINT32)(UINTN)mSmramHob->Descriptor[1].PhysicalSize;

+  }

+

+  if ((SmmBase == 0) || (SmmSize < SIZE_4KB)) {

+    DEBUG ((DEBUG_ERROR, "Invalid SMM range.\n"));

+    return ;

+  }

+

+  //

+  // SMRR size must be of length 2^n

+  // SMRR base alignment cannot be less than SMRR length

+  //

+  if ((SmmSize != GetPowerOfTwo32 (SmmSize)) || ((SmmBase & ~(SmmSize - 1)) != SmmBase)) {

+    DEBUG ((DEBUG_ERROR, " Invalid SMM range.\n"));

+    return ;

+  }

+

+  //

+  // Calculate smrr base, mask and pass them as arguments.

+  //

+  Arguments.Base = (SmmSize | MTRR_CACHE_WRITE_BACK);

+  Arguments.Mask = (~(SmmSize - 1) & EFI_MSR_SMRR_MASK);

+

+  //

+  // Set SMRR valid bit

+  //

+  Arguments.Mask |= BIT11;

+

+  //

+  // Program smrr base and mask on BSP first and then on APs

+  //

+  SetSmrr(&Arguments);

+  for (Index = 0; Index < gSmst->NumberOfCpus; Index++) {

+    if (Index != gSmst->CurrentlyExecutingCpu) {

+      Status = gSmst->SmmStartupThisAp (SetSmrr, Index, (VOID *)&Arguments);

+      if (EFI_ERROR(Status)) {

+        DEBUG ((DEBUG_ERROR, "Programming SMRR on AP# %d status: %r\n", Index, Status));

+      }

+    }

+  }

+}

+

+

+/**

+  Software SMI callback for restoring SMRR base and mask in S3 path.

+

+  @param[in]      DispatchHandle  The unique handle assigned to this handler by SmiHandlerRegister().

+  @param[in]      Context         Points to an optional handler context which was specified when the

+                                  handler was registered.

+  @param[in, out] CommBuffer      A pointer to a collection of data in memory that will

+                                  be conveyed from a non-SMM environment into an SMM environment.

+  @param[in, out] CommBufferSize  The size of the CommBuffer.

+

+  @retval EFI_SUCCESS             The interrupt was handled successfully.

+

+**/

+EFI_STATUS

+EFIAPI

+BlSwSmiHandler (

+  IN EFI_HANDLE                  DispatchHandle,

+  IN CONST VOID                  *Context,

+  IN OUT VOID                    *CommBuffer,

+  IN OUT UINTN                   *CommBufferSize

+  )

+{

+  SetSmrrOnS3 ();

+  SmmFeatureLockOnS3 ();

+  LockSmiGlobalEn ();

+

+  return EFI_SUCCESS;

+}

+

+

+/**

+  Lock SMI in this SMM ready to lock event.

+

+  @param  Protocol   Points to the protocol's unique identifier

+  @param  Interface  Points to the interface instance

+  @param  Handle     The handle on which the interface was installed

+

+  @retval EFI_SUCCESS   SmmEventCallback runs successfully

+  @retval EFI_NOT_FOUND The Fvb protocol for variable is not found.

+ **/

+EFI_STATUS

+EFIAPI

+BlSupportSmmReadyToLockCallback (

+  IN CONST EFI_GUID                       *Protocol,

+  IN VOID                                 *Interface,

+  IN EFI_HANDLE                           Handle

+  )

+{

+  //

+  // Set SMM SMI lock

+  //

+  LockSmiGlobalEn ();

+  return EFI_SUCCESS;

+}

+

+

+/**

+  The driver's entry point.

+

+  @param[in] ImageHandle  The firmware allocated handle for the EFI image.

+  @param[in] SystemTable  A pointer to the EFI System Table.

+

+  @retval EFI_SUCCESS     The entry point is executed successfully.

+  @retval Others          Some error occurs when executing this entry point.

+

+**/

+EFI_STATUS

+EFIAPI

+BlSupportSmm (

+  IN EFI_HANDLE                  ImageHandle,

+  IN EFI_SYSTEM_TABLE            *SystemTable

+  )

+{

+  EFI_STATUS                     Status;

+  EFI_SMM_SW_DISPATCH2_PROTOCOL  *SwDispatch;

+  EFI_SMM_SW_REGISTER_CONTEXT    SwContext;

+  EFI_HANDLE                     SwHandle;

+  EFI_HOB_GUID_TYPE              *GuidHob;

+  VOID                           *SmmHob;

+  VOID                           *Registration;

+

+  //

+  // Get SMM S3 communication hob and save it

+  //

+  GuidHob = GetFirstGuidHob (&gS3CommunicationGuid);

+  if (GuidHob != NULL) {

+    SmmHob = (VOID *) (GET_GUID_HOB_DATA(GuidHob));

+    CopyMem (&mPldS3Hob, SmmHob, GET_GUID_HOB_DATA_SIZE(GuidHob));

+  } else {

+    return EFI_NOT_FOUND;

+  }

+

+  if (mPldS3Hob.PldAcpiS3Enable) {

+    // Other drivers will take care of S3.

+    return EFI_SUCCESS;

+  }

+

+  //

+  // Get smram hob and save it

+  //

+  GuidHob = GetFirstGuidHob (&gEfiSmmSmramMemoryGuid);

+  if (GuidHob != NULL) {

+    SmmHob = (VOID *) (GET_GUID_HOB_DATA(GuidHob));

+    mSmramHob = AllocatePool (GET_GUID_HOB_DATA_SIZE(GuidHob));

+    if (mSmramHob == NULL) {

+      return EFI_OUT_OF_RESOURCES;

+    }

+    CopyMem (mSmramHob, SmmHob, GET_GUID_HOB_DATA_SIZE(GuidHob));

+  } else {

+    return EFI_NOT_FOUND;

+  }

+

+  //

+  // Get SMM register hob and save it

+  //

+  GuidHob = GetFirstGuidHob (&gSmmRegisterInfoGuid);

+  if (GuidHob != NULL) {

+    SmmHob = (VOID *) (GET_GUID_HOB_DATA(GuidHob));

+    mSmmRegisterHob = AllocatePool (GET_GUID_HOB_DATA_SIZE(GuidHob));

+    if (mSmmRegisterHob == NULL) {

+      return EFI_OUT_OF_RESOURCES;

+    }

+    CopyMem (mSmmRegisterHob, SmmHob, GET_GUID_HOB_DATA_SIZE(GuidHob));

+  } else {

+    return EFI_NOT_FOUND;

+  }

+

+  //

+  // Get the Sw dispatch protocol and register SMI handler.

+  //

+  Status = gSmst->SmmLocateProtocol (&gEfiSmmSwDispatch2ProtocolGuid, NULL, (VOID**)&SwDispatch);

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+  SwContext.SwSmiInputValue = (UINTN) -1;

+  Status = SwDispatch->Register (SwDispatch, BlSwSmiHandler, &SwContext, &SwHandle);

+  if (EFI_ERROR (Status)) {

+    DEBUG ((DEBUG_ERROR, "Registering S3 smi handler failed: %r\n", Status));

+    return Status;

+  }

+

+  //

+  // Register SMM ready to lock callback

+  //

+  Status = gSmst->SmmRegisterProtocolNotify (

+                    &gEfiSmmReadyToLockProtocolGuid,

+                    BlSupportSmmReadyToLockCallback,

+                    &Registration

+                    );

+  ASSERT_EFI_ERROR (Status);

+

+  SaveSmmInfoForS3 ((UINT8)SwContext.SwSmiInputValue);

+

+  return EFI_SUCCESS;

+}

+

diff --git a/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.h b/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.h
new file mode 100644
index 0000000000..f4386cb842
--- /dev/null
+++ b/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.h
@@ -0,0 +1,41 @@
+/** @file

+  The header file of bootloader support SMM.

+

+  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>

+SPDX-License-Identifier: BSD-2-Clause-Patent

+

+**/

+#ifndef BL_SUPPORT_SMM_H_

+#define BL_SUPPORT_SMM_H_

+

+#include <PiDxe.h>

+#include <Library/BaseLib.h>

+#include <Library/DebugLib.h>

+#include <Library/IoLib.h>

+#include <Library/HobLib.h>

+#include <Library/MtrrLib.h>

+#include <Library/UefiLib.h>

+#include <Library/BaseMemoryLib.h>

+#include <Library/MemoryAllocationLib.h>

+#include <Library/SmmServicesTableLib.h>

+#include <Library/PciLib.h>

+#include <Protocol/SmmSwDispatch2.h>

+#include <Protocol/SmmAccess2.h>

+#include <protocol/MpService.h>

+#include <Library/UefiBootServicesTableLib.h>

+#include <Register/Intel/ArchitecturalMsr.h>

+#include <Guid/SmmRegisterInfoGuid.h>

+#include <Guid/SmmS3CommunicationInfoGuid.h>

+#include <Guid/SmramMemoryReserve.h>

+

+#define  EFI_MSR_SMRR_MASK              0xFFFFF000

+#define  MSR_SMM_FEATURE_CONTROL        0x4E0

+#define  SMRAM_SAVE_STATE_MAP_OFFSET    0xFC00  /// Save state offset from SMBASE

+

+typedef struct {

+  UINT32  Base;

+  UINT32  Mask;

+} SMRR_BASE_MASK;

+

+#endif

+

diff --git a/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.inf b/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.inf
new file mode 100644
index 0000000000..75d4777971
--- /dev/null
+++ b/UefiPayloadPkg/BlSupportSmm/BlSupportSmm.inf
@@ -0,0 +1,49 @@
+## @file

+#  Bootloader Support SMM module

+#

+#  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>

+#

+#  SPDX-License-Identifier: BSD-2-Clause-Patent

+#

+##

+

+[Defines]

+  INF_VERSION                    = 0x00010005

+  BASE_NAME                      = BlSupportSmm

+  FILE_GUID                      = AA292DE7-E11E-42E6-846B-5813A5A8D982

+  MODULE_TYPE                    = DXE_SMM_DRIVER

+  PI_SPECIFICATION_VERSION       = 0x0001000A

+  VERSION_STRING                 = 1.0

+  ENTRY_POINT                    = BlSupportSmm

+

+[Sources]

+  BlSupportSmm.c

+  BlSupportSmm.h

+

+[Packages]

+  MdePkg/MdePkg.dec

+  MdeModulePkg/MdeModulePkg.dec

+  UefiCpuPkg/UefiCpuPkg.dec

+  UefiPayloadPkg/UefiPayloadPkg.dec

+

+[LibraryClasses]

+  UefiDriverEntryPoint

+  UefiBootServicesTableLib

+  SmmServicesTableLib

+  MemoryAllocationLib

+  BaseLib

+  IoLib

+  HobLib

+

+[Guids]

+  gS3CommunicationGuid

+  gEfiSmmSmramMemoryGuid

+  gSmmRegisterInfoGuid

+

+[Protocols]

+  gEfiSmmSwDispatch2ProtocolGuid

+  gEfiMpServiceProtocolGuid

+  gEfiSmmReadyToLockProtocolGuid

+

+[Depex]

+  gEfiSmmSwDispatch2ProtocolGuid

diff --git a/UefiPayloadPkg/Include/Guid/SmmS3CommunicationInfoGuid.h b/UefiPayloadPkg/Include/Guid/SmmS3CommunicationInfoGuid.h
new file mode 100644
index 0000000000..ee621b25f4
--- /dev/null
+++ b/UefiPayloadPkg/Include/Guid/SmmS3CommunicationInfoGuid.h
@@ -0,0 +1,54 @@
+/** @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

diff --git a/UefiPayloadPkg/UefiPayloadPkg.dec b/UefiPayloadPkg/UefiPayloadPkg.dec
index 4f93d3e671..4c3bd0c2eb 100644
--- a/UefiPayloadPkg/UefiPayloadPkg.dec
+++ b/UefiPayloadPkg/UefiPayloadPkg.dec
@@ -38,6 +38,7 @@
   gLoaderMemoryMapInfoGuid = { 0xa1ff7424, 0x7a1a, 0x478e, { 0xa9, 0xe4, 0x92, 0xf3, 0x57, 0xd1, 0x28, 0x32 } }

 

   gSmmRegisterInfoGuid     = { 0xaa9bd7a7, 0xcafb, 0x4499, { 0xa4, 0xa9, 0xb, 0x34, 0x6b, 0x40, 0xa6, 0x22 } }

+  gS3CommunicationGuid     = { 0x88e31ba1, 0x1856, 0x4b8b, { 0xbb, 0xdf, 0xf8, 0x16, 0xdd, 0x94, 0xa, 0xef } }

 

 [Ppis]

   gEfiPayLoadHobBasePpiGuid = { 0xdbe23aa1, 0xa342, 0x4b97, {0x85, 0xb6, 0xb2, 0x26, 0xf1, 0x61, 0x73, 0x89} }