/** @file

Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>

This program and the accompanying materials
are licensed and made available under the terms and conditions
of the BSD License which accompanies this distribution.  The
full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <PiPei.h>
#include <PiDxe.h>
#include <PiSmm.h>
#include <Library/PeiServicesTablePointerLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/LockBoxLib.h>
#include <Library/HobLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Protocol/SmmCommunication.h>
#include <Ppi/SmmCommunication.h>
#include <Ppi/SmmAccess.h>
#include <Guid/AcpiS3Context.h>
#include <Guid/SmmLockBox.h>

#include "SmmLockBoxLibPrivate.h"

#if defined (MDE_CPU_IA32)
typedef struct _LIST_ENTRY64 LIST_ENTRY64;
struct _LIST_ENTRY64 {
  LIST_ENTRY64  *ForwardLink;
  UINT32        Reserved1;
  LIST_ENTRY64  *BackLink;
  UINT32        Reserved2;
};

typedef struct {
  EFI_TABLE_HEADER    Hdr;
  UINT64              SmmFirmwareVendor;
  UINT64              SmmFirmwareRevision;
  UINT64              SmmInstallConfigurationTable;
  UINT64              SmmIoMemRead;
  UINT64              SmmIoMemWrite;
  UINT64              SmmIoIoRead;
  UINT64              SmmIoIoWrite;
  UINT64              SmmAllocatePool;
  UINT64              SmmFreePool;
  UINT64              SmmAllocatePages;
  UINT64              SmmFreePages;
  UINT64              SmmStartupThisAp;
  UINT64              CurrentlyExecutingCpu;
  UINT64              NumberOfCpus;
  UINT64              CpuSaveStateSize;
  UINT64              CpuSaveState;
  UINT64              NumberOfTableEntries;
  UINT64              SmmConfigurationTable;
} EFI_SMM_SYSTEM_TABLE2_64;

typedef struct {
  EFI_GUID                          VendorGuid;
  UINT64                            VendorTable;
} EFI_CONFIGURATION_TABLE64;
#endif

#if defined (MDE_CPU_X64)
typedef LIST_ENTRY LIST_ENTRY64;
typedef EFI_SMM_SYSTEM_TABLE2 EFI_SMM_SYSTEM_TABLE2_64;
typedef EFI_CONFIGURATION_TABLE EFI_CONFIGURATION_TABLE64;
#endif

/**
  This function return first node of LinkList queue.

  @param LockBoxQueue  LinkList queue

  @return first node of LinkList queue
**/
LIST_ENTRY *
InternalInitLinkDxe (
  IN LIST_ENTRY *LinkList
  )
{
  if ((sizeof(UINTN) == sizeof(UINT32)) && (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) ) {
    //
    // 32 PEI + 64 DXE
    //
    return (LIST_ENTRY *)(((LIST_ENTRY64 *)LinkList)->ForwardLink);
  } else {
    return LinkList->ForwardLink;
  }
}

/**
  This function return next node of LinkList.

  @param Link  LinkList node

  @return next node of LinkList
**/
LIST_ENTRY *
InternalNextLinkDxe (
  IN LIST_ENTRY *Link
  )
{
  if ((sizeof(UINTN) == sizeof(UINT32)) && (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) ) {
    //
    // 32 PEI + 64 DXE
    //
    return (LIST_ENTRY *)(((LIST_ENTRY64 *)Link)->ForwardLink);
  } else {
    return Link->ForwardLink;
  }
}

/**
  This function find LockBox by GUID from SMRAM.

  @param LockBoxQueue The LockBox queue in SMRAM
  @param Guid         The guid to indentify the LockBox

  @return LockBoxData
**/
SMM_LOCK_BOX_DATA *
InternalFindLockBoxByGuidFromSmram (
  IN LIST_ENTRY *LockBoxQueue,
  IN EFI_GUID   *Guid
  )
{
  LIST_ENTRY                    *Link;
  SMM_LOCK_BOX_DATA             *LockBox;

  for (Link = InternalInitLinkDxe (LockBoxQueue);
       Link != LockBoxQueue;
       Link = InternalNextLinkDxe (Link)) {
    LockBox = BASE_CR (
                Link,
                SMM_LOCK_BOX_DATA,
                Link
                );
    if (CompareGuid (&LockBox->Guid, Guid)) {
      return LockBox;
    }
  }
  return NULL;
}

/**
  Get VendorTable by VendorGuid in Smst.

  @param Signature  Signature of SMM_S3_RESUME_STATE
  @param Smst       SMM system table
  @param VendorGuid vendor guid

  @return vendor table.
**/
VOID *
InternalSmstGetVendorTableByGuid (
  IN UINT64                                        Signature,
  IN EFI_SMM_SYSTEM_TABLE2                         *Smst,
  IN EFI_GUID                                      *VendorGuid
  )
{
  EFI_CONFIGURATION_TABLE                       *SmmConfigurationTable;
  UINTN                                         NumberOfTableEntries;
  UINTN                                         Index;
  EFI_SMM_SYSTEM_TABLE2_64                      *Smst64;
  EFI_CONFIGURATION_TABLE64                     *SmmConfigurationTable64;

  if ((sizeof(UINTN) == sizeof(UINT32)) && (FeaturePcdGet (PcdDxeIplSwitchToLongMode))) {
    //
    // 32 PEI + 64 DXE
    //
    Smst64 = (EFI_SMM_SYSTEM_TABLE2_64 *)Smst;
    SmmConfigurationTable64 = (EFI_CONFIGURATION_TABLE64 *)(UINTN)Smst64->SmmConfigurationTable;
    NumberOfTableEntries = (UINTN)Smst64->NumberOfTableEntries;
    for (Index = 0; Index < NumberOfTableEntries; Index++) {
      if (CompareGuid (&SmmConfigurationTable64[Index].VendorGuid, VendorGuid)) {
        return (VOID *)(UINTN)SmmConfigurationTable64[Index].VendorTable;
      }
    }
    return NULL;
  } else {
    SmmConfigurationTable = Smst->SmmConfigurationTable;
    NumberOfTableEntries = Smst->NumberOfTableEntries;
    for (Index = 0; Index < NumberOfTableEntries; Index++) {
      if (CompareGuid (&SmmConfigurationTable[Index].VendorGuid, VendorGuid)) {
        return (VOID *)SmmConfigurationTable[Index].VendorTable;
      }
    }
    return NULL;
  }
}

/**
  Get SMM LockBox context.

  @return SMM LockBox context.
**/
SMM_LOCK_BOX_CONTEXT *
InternalGetSmmLockBoxContext (
  VOID
  )
{
  EFI_SMRAM_DESCRIPTOR                          *SmramDescriptor;
  SMM_S3_RESUME_STATE                           *SmmS3ResumeState;
  VOID                                          *GuidHob;
  SMM_LOCK_BOX_CONTEXT                          *SmmLockBoxContext;

  GuidHob = GetFirstGuidHob (&gEfiAcpiVariableGuid);
  ASSERT (GuidHob != NULL);
  SmramDescriptor = (EFI_SMRAM_DESCRIPTOR *) GET_GUID_HOB_DATA (GuidHob);
  SmmS3ResumeState = (SMM_S3_RESUME_STATE *)(UINTN)SmramDescriptor->CpuStart;

  SmmLockBoxContext = (SMM_LOCK_BOX_CONTEXT *)InternalSmstGetVendorTableByGuid (
                                                SmmS3ResumeState->Signature,
                                                (EFI_SMM_SYSTEM_TABLE2 *)(UINTN)SmmS3ResumeState->Smst,
                                                &gEfiSmmLockBoxCommunicationGuid
                                                );
  ASSERT (SmmLockBoxContext != NULL);

  return SmmLockBoxContext;
}

/**
  This function will restore confidential information from lockbox in SMRAM directly.

  @param Guid   the guid to identify the confidential information
  @param Buffer the address of the restored confidential information
                NULL means restored to original address, Length MUST be NULL at same time.
  @param Length the length of the restored confidential information

  @retval RETURN_SUCCESS            the information is restored successfully.
  @retval RETURN_WRITE_PROTECTED    Buffer and Length are NULL, but the LockBox has no 
                                    LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE attribute.
  @retval RETURN_BUFFER_TOO_SMALL   the Length is too small to hold the confidential information.
  @retval RETURN_NOT_FOUND          the requested GUID not found.
**/
EFI_STATUS
InternalRestoreLockBoxFromSmram (
  IN  GUID                        *Guid,
  IN  VOID                        *Buffer, OPTIONAL
  IN  OUT UINTN                   *Length  OPTIONAL
  )
{
  PEI_SMM_ACCESS_PPI             *SmmAccess;
  UINTN                          Index;
  EFI_STATUS                     Status;
  SMM_LOCK_BOX_CONTEXT           *SmmLockBoxContext;
  LIST_ENTRY                     *LockBoxQueue;
  SMM_LOCK_BOX_DATA              *LockBox;
  VOID                           *RestoreBuffer;

  //
  // Get needed resource
  //
  Status = PeiServicesLocatePpi (
             &gPeiSmmAccessPpiGuid,
             0,
             NULL,
             (VOID **)&SmmAccess
             );
  if (!EFI_ERROR (Status)) {
    for (Index = 0; !EFI_ERROR (Status); Index++) {
      Status = SmmAccess->Open ((EFI_PEI_SERVICES **)GetPeiServicesTablePointer (), SmmAccess, Index);
    }
  }

  //
  // Get LockBox context
  //
  SmmLockBoxContext = InternalGetSmmLockBoxContext ();
  LockBoxQueue = (LIST_ENTRY *)(UINTN)SmmLockBoxContext->LockBoxDataAddress;

  //
  // We do NOT check Buffer address in SMRAM, because if SMRAM not locked, we trust the caller.
  //

  //
  // Restore this, Buffer and Length MUST be both NULL or both non-NULL
  //

  //
  // Find LockBox
  //
  LockBox = InternalFindLockBoxByGuidFromSmram (LockBoxQueue, Guid);
  if (LockBox == NULL) {
    //
    // Not found
    //
    return EFI_NOT_FOUND;
  }

  //
  // Set RestoreBuffer
  //
  if (Buffer != NULL) {
    //
    // restore to new buffer
    //
    RestoreBuffer = Buffer;
  } else {
    //
    // restore to original buffer
    //
    if ((LockBox->Attributes & LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE) == 0) {
      return EFI_WRITE_PROTECTED;
    }
    RestoreBuffer = (VOID *)(UINTN)LockBox->Buffer;
  }

  //
  // Set RestoreLength
  //
  if (Length != NULL) {
    if (*Length < (UINTN)LockBox->Length) {
      //
      // Input buffer is too small to hold all data.
      //
      *Length = (UINTN)LockBox->Length;
      return EFI_BUFFER_TOO_SMALL;
    }
    *Length = (UINTN)LockBox->Length;
  }

  //
  // Restore data
  //
  CopyMem (RestoreBuffer, (VOID *)(UINTN)LockBox->SmramBuffer, (UINTN)LockBox->Length);

  //
  // Done
  //
  return EFI_SUCCESS;
}

/**
  This function will restore confidential information from all lockbox which have RestoreInPlace attribute.

  @retval RETURN_SUCCESS            the information is restored successfully.
**/
EFI_STATUS
InternalRestoreAllLockBoxInPlaceFromSmram (
  VOID
  )
{
  PEI_SMM_ACCESS_PPI             *SmmAccess;
  UINTN                          Index;
  EFI_STATUS                     Status;
  SMM_LOCK_BOX_CONTEXT           *SmmLockBoxContext;
  LIST_ENTRY                     *LockBoxQueue;
  SMM_LOCK_BOX_DATA              *LockBox;
  LIST_ENTRY                     *Link;

  //
  // Get needed resource
  //
  Status = PeiServicesLocatePpi (
             &gPeiSmmAccessPpiGuid,
             0,
             NULL,
             (VOID **)&SmmAccess
             );
  if (!EFI_ERROR (Status)) {
    for (Index = 0; !EFI_ERROR (Status); Index++) {
      Status = SmmAccess->Open ((EFI_PEI_SERVICES **)GetPeiServicesTablePointer (), SmmAccess, Index);
    }
  }

  //
  // Get LockBox context
  //
  SmmLockBoxContext = InternalGetSmmLockBoxContext ();
  LockBoxQueue = (LIST_ENTRY *)(UINTN)SmmLockBoxContext->LockBoxDataAddress;

  //
  // We do NOT check Buffer address in SMRAM, because if SMRAM not locked, we trust the caller.
  //

  //
  // Restore all, Buffer and Length MUST be NULL
  //
  for (Link = InternalInitLinkDxe (LockBoxQueue);
       Link != LockBoxQueue;
       Link = InternalNextLinkDxe (Link)) {
    LockBox = BASE_CR (
                Link,
                SMM_LOCK_BOX_DATA,
                Link
                );
    if ((LockBox->Attributes & LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE) != 0) {
      //
      // Restore data
      //
      CopyMem ((VOID *)(UINTN)LockBox->Buffer, (VOID *)(UINTN)LockBox->SmramBuffer, (UINTN)LockBox->Length);
    }
  }
  //
  // Done
  //
  return EFI_SUCCESS;
}

/**
  This function will save confidential information to lockbox.

  @param Guid       the guid to identify the confidential information
  @param Buffer     the address of the confidential information
  @param Length     the length of the confidential information

  @retval RETURN_SUCCESS            the information is saved successfully.
  @retval RETURN_INVALID_PARAMETER  the Guid is NULL, or Buffer is NULL, or Length is 0
  @retval RETURN_ALREADY_STARTED    the requested GUID already exist.
  @retval RETURN_OUT_OF_RESOURCES   no enough resource to save the information.
  @retval RETURN_ACCESS_DENIED      it is too late to invoke this interface
  @retval RETURN_NOT_STARTED        it is too early to invoke this interface
  @retval RETURN_UNSUPPORTED        the service is not supported by implementaion.
**/
RETURN_STATUS
EFIAPI
SaveLockBox (
  IN  GUID                        *Guid,
  IN  VOID                        *Buffer,
  IN  UINTN                       Length
  )
{
  ASSERT (FALSE);

  //
  // No support to save at PEI phase
  //
  return RETURN_UNSUPPORTED;
}

/**
  This function will set lockbox attributes.

  @param Guid       the guid to identify the confidential information
  @param Attributes the attributes of the lockbox

  @retval RETURN_SUCCESS            the information is saved successfully.
  @retval RETURN_INVALID_PARAMETER  attributes is invalid.
  @retval RETURN_NOT_FOUND          the requested GUID not found.
  @retval RETURN_ACCESS_DENIED      it is too late to invoke this interface
  @retval RETURN_NOT_STARTED        it is too early to invoke this interface
  @retval RETURN_UNSUPPORTED        the service is not supported by implementaion.
**/
RETURN_STATUS
EFIAPI
SetLockBoxAttributes (
  IN  GUID                        *Guid,
  IN  UINT64                      Attributes
  )
{
  ASSERT (FALSE);

  //
  // No support to save at PEI phase
  //
  return RETURN_UNSUPPORTED;
}

/**
  This function will update confidential information to lockbox.

  @param Guid   the guid to identify the original confidential information
  @param Offset the offset of the original confidential information
  @param Buffer the address of the updated confidential information
  @param Length the length of the updated confidential information

  @retval RETURN_SUCCESS            the information is saved successfully.
  @retval RETURN_INVALID_PARAMETER  the Guid is NULL, or Buffer is NULL, or Length is 0.
  @retval RETURN_NOT_FOUND          the requested GUID not found.
  @retval RETURN_BUFFER_TOO_SMALL   the original buffer to too small to hold new information.
  @retval RETURN_ACCESS_DENIED      it is too late to invoke this interface
  @retval RETURN_NOT_STARTED        it is too early to invoke this interface
  @retval RETURN_UNSUPPORTED        the service is not supported by implementaion.
**/
RETURN_STATUS
EFIAPI
UpdateLockBox (
  IN  GUID                        *Guid,
  IN  UINTN                       Offset,
  IN  VOID                        *Buffer,
  IN  UINTN                       Length
  )
{
  ASSERT (FALSE);

  //
  // No support to update at PEI phase
  //
  return RETURN_UNSUPPORTED;
}

/**
  This function will restore confidential information from lockbox.

  @param Guid   the guid to identify the confidential information
  @param Buffer the address of the restored confidential information
                NULL means restored to original address, Length MUST be NULL at same time.
  @param Length the length of the restored confidential information

  @retval RETURN_SUCCESS            the information is restored successfully.
  @retval RETURN_INVALID_PARAMETER  the Guid is NULL, or one of Buffer and Length is NULL.
  @retval RETURN_WRITE_PROTECTED    Buffer and Length are NULL, but the LockBox has no 
                                    LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE attribute.
  @retval RETURN_BUFFER_TOO_SMALL   the Length is too small to hold the confidential information.
  @retval RETURN_NOT_FOUND          the requested GUID not found.
  @retval RETURN_NOT_STARTED        it is too early to invoke this interface
  @retval RETURN_ACCESS_DENIED      not allow to restore to the address
  @retval RETURN_UNSUPPORTED        the service is not supported by implementaion.
**/
RETURN_STATUS
EFIAPI
RestoreLockBox (
  IN  GUID                        *Guid,
  IN  VOID                        *Buffer, OPTIONAL
  IN  OUT UINTN                   *Length  OPTIONAL
  )
{
  EFI_STATUS                         Status;
  EFI_PEI_SMM_COMMUNICATION_PPI      *SmmCommunicationPpi;
  EFI_SMM_LOCK_BOX_PARAMETER_RESTORE *LockBoxParameterRestore;
  EFI_SMM_COMMUNICATE_HEADER         *CommHeader;
  UINT8                              CommBuffer[sizeof(EFI_GUID) + sizeof(UINT64) + sizeof(EFI_SMM_LOCK_BOX_PARAMETER_RESTORE)];
  UINTN                              CommSize;
  UINT64                             MessageLength;

  //
  // Please aware that there is UINTN in EFI_SMM_COMMUNICATE_HEADER. It might be UINT64 in DXE, while it is UINT32 in PEI.
  // typedef struct {
  //   EFI_GUID  HeaderGuid;
  //   UINTN     MessageLength;
  //   UINT8     Data[1];
  // } EFI_SMM_COMMUNICATE_HEADER;
  //

  DEBUG ((EFI_D_INFO, "SmmLockBoxPeiLib RestoreLockBox - Enter\n"));

  //
  // Basic check
  //
  if ((Guid == NULL) ||
      ((Buffer == NULL) && (Length != NULL)) ||
      ((Buffer != NULL) && (Length == NULL))) {
    return EFI_INVALID_PARAMETER;
  }

  //
  // Get needed resource
  //
  Status = PeiServicesLocatePpi (
             &gEfiPeiSmmCommunicationPpiGuid,
             0,
             NULL,
             (VOID **)&SmmCommunicationPpi
             );
  if (EFI_ERROR (Status)) {
    return EFI_NOT_STARTED;
  }

  //
  // Prepare parameter
  //
  CommHeader = (EFI_SMM_COMMUNICATE_HEADER *)&CommBuffer[0];
  CopyMem (&CommHeader->HeaderGuid, &gEfiSmmLockBoxCommunicationGuid, sizeof(gEfiSmmLockBoxCommunicationGuid));
  if ((sizeof(UINTN) == sizeof(UINT32)) && (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) ) {
    MessageLength = sizeof(*LockBoxParameterRestore);
    CopyMem (&CommBuffer[OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, MessageLength)], &MessageLength, sizeof(MessageLength));
  } else {
    CommHeader->MessageLength = sizeof(*LockBoxParameterRestore);
  }

  DEBUG ((EFI_D_INFO, "SmmLockBoxPeiLib CommBuffer - %x\n", &CommBuffer[0]));
  if ((sizeof(UINTN) == sizeof(UINT32)) && (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) ) {
    LockBoxParameterRestore = (EFI_SMM_LOCK_BOX_PARAMETER_RESTORE *)&CommBuffer[OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, MessageLength) + sizeof(UINT64)];
  } else {
    LockBoxParameterRestore = (EFI_SMM_LOCK_BOX_PARAMETER_RESTORE *)&CommBuffer[OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, MessageLength) + sizeof(UINTN)];
  }
  DEBUG ((EFI_D_INFO, "SmmLockBoxPeiLib LockBoxParameterRestore - %x\n", LockBoxParameterRestore));
  LockBoxParameterRestore->Header.Command    = EFI_SMM_LOCK_BOX_COMMAND_RESTORE;
  LockBoxParameterRestore->Header.DataLength = sizeof(*LockBoxParameterRestore);
  LockBoxParameterRestore->Header.ReturnStatus = (UINT64)-1;
  if (Guid != 0) {
    CopyMem (&LockBoxParameterRestore->Guid, Guid, sizeof(*Guid));
  } else {
    ZeroMem (&LockBoxParameterRestore->Guid, sizeof(*Guid));
  }
  LockBoxParameterRestore->Buffer = (EFI_PHYSICAL_ADDRESS)(UINTN)Buffer;
  if (Length != NULL) {
    LockBoxParameterRestore->Length = (EFI_PHYSICAL_ADDRESS)*Length;
  } else {
    LockBoxParameterRestore->Length = 0;
  }

  //
  // Send command
  //
  CommSize = sizeof(CommBuffer);
  Status = SmmCommunicationPpi->Communicate (
                                  SmmCommunicationPpi,
                                  &CommBuffer[0],
                                  &CommSize
                                  );
  if (Status == EFI_NOT_STARTED) {
    //
    // Pei SMM communication not ready yet, so we access SMRAM directly
    //
    DEBUG ((EFI_D_INFO, "SmmLockBoxPeiLib Communicate - (%r)\n", Status));
    Status = InternalRestoreLockBoxFromSmram (Guid, Buffer, Length);
    LockBoxParameterRestore->Header.ReturnStatus = (UINT64)Status;
    if (Length != NULL) {
      LockBoxParameterRestore->Length = (UINT64)*Length;
    }
  }
  ASSERT_EFI_ERROR (Status);

  if (Length != NULL) {
    *Length = (UINTN)LockBoxParameterRestore->Length;
  }

  Status = (EFI_STATUS)LockBoxParameterRestore->Header.ReturnStatus;
  if (Status != EFI_SUCCESS) {
    // Need or MAX_BIT, because there might be case that SMM is X64 while PEI is IA32.
    Status |= MAX_BIT;
  }

  DEBUG ((EFI_D_INFO, "SmmLockBoxPeiLib RestoreLockBox - Exit (%r)\n", Status));

  //
  // Done
  //
  return Status;
}

/**
  This function will restore confidential information from all lockbox which have RestoreInPlace attribute.

  @retval RETURN_SUCCESS            the information is restored successfully.
  @retval RETURN_NOT_STARTED        it is too early to invoke this interface
  @retval RETURN_UNSUPPORTED        the service is not supported by implementaion.
**/
RETURN_STATUS
EFIAPI
RestoreAllLockBoxInPlace (
  VOID
  )
{
  EFI_STATUS                                      Status;
  EFI_PEI_SMM_COMMUNICATION_PPI                   *SmmCommunicationPpi;
  EFI_SMM_LOCK_BOX_PARAMETER_RESTORE_ALL_IN_PLACE *LockBoxParameterRestoreAllInPlace;
  EFI_SMM_COMMUNICATE_HEADER                      *CommHeader;
  UINT8                                           CommBuffer[sizeof(EFI_GUID) + sizeof(UINT64) + sizeof(EFI_SMM_LOCK_BOX_PARAMETER_RESTORE_ALL_IN_PLACE)];
  UINTN                                           CommSize;
  UINT64                                          MessageLength;

  //
  // Please aware that there is UINTN in EFI_SMM_COMMUNICATE_HEADER. It might be UINT64 in DXE, while it is UINT32 in PEI.
  // typedef struct {
  //   EFI_GUID  HeaderGuid;
  //   UINTN     MessageLength;
  //   UINT8     Data[1];
  // } EFI_SMM_COMMUNICATE_HEADER;
  //

  DEBUG ((EFI_D_INFO, "SmmLockBoxPeiLib RestoreAllLockBoxInPlace - Enter\n"));

  //
  // Get needed resource
  //
  Status = PeiServicesLocatePpi (
             &gEfiPeiSmmCommunicationPpiGuid,
             0,
             NULL,
             (VOID **)&SmmCommunicationPpi
             );
  if (EFI_ERROR (Status)) {
    return EFI_NOT_STARTED;
  }

  //
  // Prepare parameter
  //
  CommHeader = (EFI_SMM_COMMUNICATE_HEADER *)&CommBuffer[0];
  CopyMem (&CommHeader->HeaderGuid, &gEfiSmmLockBoxCommunicationGuid, sizeof(gEfiSmmLockBoxCommunicationGuid));
  if ((sizeof(UINTN) == sizeof(UINT32)) && (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) ) {
    MessageLength = sizeof(*LockBoxParameterRestoreAllInPlace);
    CopyMem (&CommBuffer[OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, MessageLength)], &MessageLength, sizeof(MessageLength));
  } else {
    CommHeader->MessageLength = sizeof(*LockBoxParameterRestoreAllInPlace);
  }

  if ((sizeof(UINTN) == sizeof(UINT32)) && (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) ) {
    LockBoxParameterRestoreAllInPlace = (EFI_SMM_LOCK_BOX_PARAMETER_RESTORE_ALL_IN_PLACE *)&CommBuffer[OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, MessageLength) + sizeof(UINT64)];
  } else {
    LockBoxParameterRestoreAllInPlace = (EFI_SMM_LOCK_BOX_PARAMETER_RESTORE_ALL_IN_PLACE *)&CommBuffer[OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, MessageLength) + sizeof(UINTN)];
  }
  LockBoxParameterRestoreAllInPlace->Header.Command    = EFI_SMM_LOCK_BOX_COMMAND_RESTORE_ALL_IN_PLACE;
  LockBoxParameterRestoreAllInPlace->Header.DataLength = sizeof(*LockBoxParameterRestoreAllInPlace);
  LockBoxParameterRestoreAllInPlace->Header.ReturnStatus = (UINT64)-1;

  //
  // Send command
  //
  CommSize = sizeof(CommBuffer);
  Status = SmmCommunicationPpi->Communicate (
                                  SmmCommunicationPpi,
                                  &CommBuffer[0],
                                  &CommSize
                                  );
  if (Status == EFI_NOT_STARTED) {
    //
    // Pei SMM communication not ready yet, so we access SMRAM directly
    //
    DEBUG ((EFI_D_INFO, "SmmLockBoxPeiLib Communicate - (%r)\n", Status));
    Status = InternalRestoreAllLockBoxInPlaceFromSmram ();
    LockBoxParameterRestoreAllInPlace->Header.ReturnStatus = (UINT64)Status;
  }
  ASSERT_EFI_ERROR (Status);

  Status = (EFI_STATUS)LockBoxParameterRestoreAllInPlace->Header.ReturnStatus;
  if (Status != EFI_SUCCESS) {
    // Need or MAX_BIT, because there might be case that SMM is X64 while PEI is IA32.
    Status |= MAX_BIT;
  }

  DEBUG ((EFI_D_INFO, "SmmLockBoxPeiLib RestoreAllLockBoxInPlace - Exit (%r)\n", Status));

  //
  // Done
  //
  return Status;
}

