audk/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c

/** @file
  HII Config Access protocol implementation of TCG2 configuration module.
  NOTE: This module is only for reference only, each platform should have its own setup page.

Copyright (c) 2015 - 2016, 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 "Tcg2ConfigImpl.h"
#include <Library/PcdLib.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/IoLib.h>
#include <Guid/TpmInstance.h>

#include <IndustryStandard/TpmPtp.h>

#define EFI_TCG2_EVENT_LOG_FORMAT_ALL   (EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2 | EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)

TPM_INSTANCE_ID  mTpmInstanceId[TPM_DEVICE_MAX + 1] = TPM_INSTANCE_ID_LIST;

TCG2_CONFIG_PRIVATE_DATA         *mTcg2ConfigPrivateDate;
TCG2_CONFIG_PRIVATE_DATA         mTcg2ConfigPrivateDateTemplate = {
  TCG2_CONFIG_PRIVATE_DATA_SIGNATURE,
  {
    Tcg2ExtractConfig,
    Tcg2RouteConfig,
    Tcg2Callback
  }
};

HII_VENDOR_DEVICE_PATH          mTcg2HiiVendorDevicePath = {
  {
    {
      HARDWARE_DEVICE_PATH,
      HW_VENDOR_DP,
      {
        (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
      }
    },
    TCG2_CONFIG_FORM_SET_GUID
  },
  {
    END_DEVICE_PATH_TYPE,
    END_ENTIRE_DEVICE_PATH_SUBTYPE,
    { 
      (UINT8) (END_DEVICE_PATH_LENGTH),
      (UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
    }
  }
};

UINT8  mCurrentPpRequest;

/**
  Return PTP interface type.

  @param[in] Register                Pointer to PTP register.

  @return PTP interface type.
**/
UINT8
GetPtpInterface (
  IN VOID *Register
  )
{
  PTP_CRB_INTERFACE_IDENTIFIER  InterfaceId;
  PTP_FIFO_INTERFACE_CAPABILITY InterfaceCapability;

  //
  // Check interface id
  //
  InterfaceId.Uint32 = MmioRead32 ((UINTN)&((PTP_CRB_REGISTERS *)Register)->InterfaceId);
  InterfaceCapability.Uint32 = MmioRead32 ((UINTN)&((PTP_FIFO_REGISTERS *)Register)->InterfaceCapability);

  if ((InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_CRB) &&
      (InterfaceId.Bits.InterfaceVersion == PTP_INTERFACE_IDENTIFIER_INTERFACE_VERSION_CRB) &&
      (InterfaceId.Bits.CapCRB != 0)) {
    return TPM_DEVICE_INTERFACE_PTP_CRB;
  }
  if ((InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_FIFO) &&
      (InterfaceId.Bits.InterfaceVersion == PTP_INTERFACE_IDENTIFIER_INTERFACE_VERSION_FIFO) &&
      (InterfaceId.Bits.CapFIFO != 0) &&
      (InterfaceCapability.Bits.InterfaceVersion == INTERFACE_CAPABILITY_INTERFACE_VERSION_PTP)) {
    return TPM_DEVICE_INTERFACE_PTP_FIFO;
  }
  return TPM_DEVICE_INTERFACE_TIS;
}

/**
  Return if PTP CRB is supported.

  @param[in] Register                Pointer to PTP register.
  
  @retval TRUE  PTP CRB is supported.
  @retval FALSE PTP CRB is unsupported.
**/
BOOLEAN
IsPtpCrbSupported (
  IN VOID                 *Register
  )
{
  PTP_CRB_INTERFACE_IDENTIFIER  InterfaceId;

  //
  // Check interface id
  //
  InterfaceId.Uint32 = MmioRead32 ((UINTN)&((PTP_CRB_REGISTERS *)Register)->InterfaceId);

  if (((InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_CRB) ||
       (InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_FIFO)) &&
      (InterfaceId.Bits.CapCRB != 0)) {
    return TRUE;
  }
  return FALSE;
}

/**
  Return if PTP FIFO is supported.

  @param[in] Register                Pointer to PTP register.
  
  @retval TRUE  PTP FIFO is supported.
  @retval FALSE PTP FIFO is unsupported.
**/
BOOLEAN
IsPtpFifoSupported (
  IN VOID                 *Register
  )
{
  PTP_CRB_INTERFACE_IDENTIFIER  InterfaceId;

  //
  // Check interface id
  //
  InterfaceId.Uint32 = MmioRead32 ((UINTN)&((PTP_CRB_REGISTERS *)Register)->InterfaceId);

  if (((InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_CRB) ||
       (InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_FIFO)) &&
      (InterfaceId.Bits.CapFIFO != 0)) {
    return TRUE;
  }
  return FALSE;
}

/**
  Set PTP interface type.

  @param[in] Register                Pointer to PTP register.
  @param[in] PtpInterface            PTP interface type.
  
  @retval EFI_SUCCESS                PTP interface type is set.
  @retval EFI_INVALID_PARAMETER      PTP interface type is invalid.
  @retval EFI_UNSUPPORTED            PTP interface type is unsupported.
  @retval EFI_WRITE_PROTECTED        PTP interface is locked.
**/
EFI_STATUS
SetPtpInterface (
  IN VOID                 *Register,
  IN UINT8                PtpInterface
  )
{
  UINT8                         PtpInterfaceCurrent;
  PTP_CRB_INTERFACE_IDENTIFIER  InterfaceId;

  PtpInterfaceCurrent = GetPtpInterface (Register);
  if ((PtpInterfaceCurrent != TPM_DEVICE_INTERFACE_PTP_FIFO) && 
      (PtpInterfaceCurrent != TPM_DEVICE_INTERFACE_PTP_CRB)) {
    return EFI_UNSUPPORTED;
  }
  InterfaceId.Uint32 = MmioRead32 ((UINTN)&((PTP_CRB_REGISTERS *)Register)->InterfaceId);
  if (InterfaceId.Bits.IntfSelLock != 0) {
    return EFI_WRITE_PROTECTED;
  }

  switch (PtpInterface) {
  case TPM_DEVICE_INTERFACE_PTP_FIFO:
    if (InterfaceId.Bits.CapFIFO == 0) {
      return EFI_UNSUPPORTED;
    }
    InterfaceId.Bits.InterfaceSelector = PTP_INTERFACE_IDENTIFIER_INTERFACE_SELECTOR_FIFO;
    MmioWrite32 ((UINTN)&((PTP_CRB_REGISTERS *)Register)->InterfaceId, InterfaceId.Uint32);
    return EFI_SUCCESS;
  case TPM_DEVICE_INTERFACE_PTP_CRB:
    if (InterfaceId.Bits.CapCRB == 0) {
      return EFI_UNSUPPORTED;
    }
    InterfaceId.Bits.InterfaceSelector = PTP_INTERFACE_IDENTIFIER_INTERFACE_SELECTOR_CRB;
    MmioWrite32 ((UINTN)&((PTP_CRB_REGISTERS *)Register)->InterfaceId, InterfaceId.Uint32);
    return EFI_SUCCESS;
  default:
    return EFI_INVALID_PARAMETER;
  }
}

/**
  This function allows a caller to extract the current configuration for one
  or more named elements from the target driver.

  @param[in]   This              Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
  @param[in]   Request           A null-terminated Unicode string in
                                 <ConfigRequest> format.
  @param[out]  Progress          On return, points to a character in the Request
                                 string. Points to the string's null terminator if
                                 request was successful. Points to the most recent
                                 '&' before the first failing name/value pair (or
                                 the beginning of the string if the failure is in
                                 the first name/value pair) if the request was not
                                 successful.
  @param[out]  Results           A null-terminated Unicode string in
                                 <ConfigAltResp> format which has all values filled
                                 in for the names in the Request string. String to
                                 be allocated by the called function.

  @retval EFI_SUCCESS            The Results is filled with the requested values.
  @retval EFI_OUT_OF_RESOURCES   Not enough memory to store the results.
  @retval EFI_INVALID_PARAMETER  Request is illegal syntax, or unknown name.
  @retval EFI_NOT_FOUND          Routing data doesn't match any storage in this
                                 driver.

**/
EFI_STATUS
EFIAPI
Tcg2ExtractConfig (
  IN CONST EFI_HII_CONFIG_ACCESS_PROTOCOL        *This,
  IN CONST EFI_STRING                            Request,
       OUT EFI_STRING                            *Progress,
       OUT EFI_STRING                            *Results
  )
{
  if (Progress == NULL || Results == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  *Progress = Request;
  return EFI_NOT_FOUND;
}

/**
  Save TPM request to variable space.

  @param[in] PpRequest             Physical Presence request command.

  @retval    EFI_SUCCESS           The operation is finished successfully.
  @retval    Others                Other errors as indicated.

**/
EFI_STATUS
SaveTcg2PpRequest (
  IN UINT8                         PpRequest
  )
{
  UINT32      ReturnCode;
  EFI_STATUS  Status;

  ReturnCode = Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunction (PpRequest, 0);
  if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_SUCCESS) {
    mCurrentPpRequest = PpRequest;
    Status = EFI_SUCCESS;
  } else if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE) {
    Status = EFI_OUT_OF_RESOURCES;
  } else if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_NOT_IMPLEMENTED) {
    Status = EFI_UNSUPPORTED;
  } else {
    Status = EFI_DEVICE_ERROR;
  }

  return Status;
}

/**
  Save TPM request to variable space.

  @param[in] PpRequestParameter    Physical Presence request parameter.

  @retval    EFI_SUCCESS           The operation is finished successfully.
  @retval    Others                Other errors as indicated.

**/
EFI_STATUS
SaveTcg2PpRequestParameter (
  IN UINT32                        PpRequestParameter
  )
{
  UINT32      ReturnCode;
  EFI_STATUS  Status;

  ReturnCode = Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunction (mCurrentPpRequest, PpRequestParameter);
  if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_SUCCESS) {
    Status = EFI_SUCCESS;
  } else if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE) {
    Status = EFI_OUT_OF_RESOURCES;
  } else if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_NOT_IMPLEMENTED) {
    Status = EFI_UNSUPPORTED;
  } else {
    Status = EFI_DEVICE_ERROR;
  }

  return Status;
}

/**
  Save Tcg2 PCR Banks request request to variable space.

  @param[in] PCRBankIndex     PCR Bank Index.
  @param[in] Enable           Enable or disable this PCR Bank.

  @retval    EFI_SUCCESS           The operation is finished successfully.
  @retval    Others                Other errors as indicated.

**/
EFI_STATUS
SaveTcg2PCRBanksRequest (
  IN UINTN   PCRBankIndex,
  IN BOOLEAN Enable
  )
{
  UINT32      ReturnCode;
  EFI_STATUS  Status;

  if (Enable) {
    mTcg2ConfigPrivateDate->PCRBanksDesired |= (0x1 << PCRBankIndex);
  } else {
    mTcg2ConfigPrivateDate->PCRBanksDesired &= ~(0x1 << PCRBankIndex);
  }
  
  ReturnCode = Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunction (TCG2_PHYSICAL_PRESENCE_SET_PCR_BANKS, mTcg2ConfigPrivateDate->PCRBanksDesired);
  if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_SUCCESS) {
    Status = EFI_SUCCESS;
  } else if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE) {
    Status = EFI_OUT_OF_RESOURCES;
  } else if (ReturnCode == TCG_PP_SUBMIT_REQUEST_TO_PREOS_NOT_IMPLEMENTED) {
    Status = EFI_UNSUPPORTED;
  } else {
    Status = EFI_DEVICE_ERROR;
  }

  return Status;
}

/**
  This function processes the results of changes in configuration.

  @param[in]  This               Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
  @param[in]  Configuration      A null-terminated Unicode string in <ConfigResp>
                                 format.
  @param[out] Progress           A pointer to a string filled in with the offset of
                                 the most recent '&' before the first failing
                                 name/value pair (or the beginning of the string if
                                 the failure is in the first name/value pair) or
                                 the terminating NULL if all was successful.

  @retval EFI_SUCCESS            The Results is processed successfully.
  @retval EFI_INVALID_PARAMETER  Configuration is NULL.
  @retval EFI_NOT_FOUND          Routing data doesn't match any storage in this
                                 driver.

**/
EFI_STATUS
EFIAPI
Tcg2RouteConfig (
  IN CONST EFI_HII_CONFIG_ACCESS_PROTOCOL      *This,
  IN CONST EFI_STRING                          Configuration,
       OUT EFI_STRING                          *Progress
  )
{
  if (Configuration == NULL || Progress == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  return EFI_NOT_FOUND;
}

/**
  This function processes the results of changes in configuration.

  @param[in]  This               Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
  @param[in]  Action             Specifies the type of action taken by the browser.
  @param[in]  QuestionId         A unique value which is sent to the original
                                 exporting driver so that it can identify the type
                                 of data to expect.
  @param[in]  Type               The type of value for the question.
  @param[in]  Value              A pointer to the data being sent to the original
                                 exporting driver.
  @param[out] ActionRequest      On return, points to the action requested by the
                                 callback function.

  @retval EFI_SUCCESS            The callback successfully handled the action.
  @retval EFI_OUT_OF_RESOURCES   Not enough storage is available to hold the
                                 variable and its data.
  @retval EFI_DEVICE_ERROR       The variable could not be saved.
  @retval EFI_UNSUPPORTED        The specified Action is not supported by the
                                 callback.

**/
EFI_STATUS
EFIAPI
Tcg2Callback (
  IN CONST EFI_HII_CONFIG_ACCESS_PROTOCOL      *This,
  IN     EFI_BROWSER_ACTION                    Action,
  IN     EFI_QUESTION_ID                       QuestionId,
  IN     UINT8                                 Type,
  IN     EFI_IFR_TYPE_VALUE                    *Value,
     OUT EFI_BROWSER_ACTION_REQUEST            *ActionRequest
  )
{
  EFI_INPUT_KEY               Key;

  if ((This == NULL) || (Value == NULL) || (ActionRequest == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  if (Action == EFI_BROWSER_ACTION_CHANGING) {
    if (QuestionId == KEY_TPM_DEVICE_INTERFACE) {
      EFI_STATUS  Status;
      Status = SetPtpInterface ((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress), Value->u8);
      if (EFI_ERROR (Status)) {
        CreatePopUp (
          EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE,
          &Key,
          L"Error: Fail to set PTP interface!",
          NULL
          );
        return EFI_DEVICE_ERROR;
      }
    }
  }
  
  if (Action == EFI_BROWSER_ACTION_CHANGED) {
    if (QuestionId == KEY_TPM_DEVICE) {
      return EFI_SUCCESS;
    }
    if (QuestionId == KEY_TPM2_OPERATION) {
      return SaveTcg2PpRequest (Value->u8);
    }
    if (QuestionId == KEY_TPM2_OPERATION_PARAMETER) {
      return SaveTcg2PpRequestParameter (Value->u32);
    }
    if ((QuestionId >= KEY_TPM2_PCR_BANKS_REQUEST_0) && (QuestionId <= KEY_TPM2_PCR_BANKS_REQUEST_4)) {
      SaveTcg2PCRBanksRequest (QuestionId - KEY_TPM2_PCR_BANKS_REQUEST_0, Value->b);
    }
  }

  return EFI_UNSUPPORTED;
}

/**
  Append Buffer With TpmAlgHash.

  @param[in] Buffer               Buffer to be appended.
  @param[in] BufferSize           Size of buffer.
  @param[in] TpmAlgHash           TpmAlgHash.

**/
VOID
AppendBufferWithTpmAlgHash (
  IN UINT16  *Buffer,
  IN UINTN   BufferSize,
  IN UINT32  TpmAlgHash
  )
{
  switch (TpmAlgHash) {
  case TPM_ALG_SHA1:
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SHA1");
    break;
  case TPM_ALG_SHA256:
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SHA256");
    break;
  case TPM_ALG_SHA384:
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SHA384");
    break;
  case TPM_ALG_SHA512:
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SHA512");
    break;
  case TPM_ALG_SM3_256:
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SM3_256");
    break;
  }
}

/**
  Fill Buffer With BootHashAlg.

  @param[in] Buffer               Buffer to be filled.
  @param[in] BufferSize           Size of buffer.
  @param[in] BootHashAlg          BootHashAlg.

**/
VOID
FillBufferWithBootHashAlg (
  IN UINT16  *Buffer,
  IN UINTN   BufferSize,
  IN UINT32  BootHashAlg
  )
{
  Buffer[0] = 0;
  if ((BootHashAlg & EFI_TCG2_BOOT_HASH_ALG_SHA1) != 0) {
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SHA1");
  }
  if ((BootHashAlg & EFI_TCG2_BOOT_HASH_ALG_SHA256) != 0) {
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SHA256");
  }
  if ((BootHashAlg & EFI_TCG2_BOOT_HASH_ALG_SHA384) != 0) {
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SHA384");
  }
  if ((BootHashAlg & EFI_TCG2_BOOT_HASH_ALG_SHA512) != 0) {
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SHA512");
  }
  if ((BootHashAlg & EFI_TCG2_BOOT_HASH_ALG_SM3_256) != 0) {
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"SM3_256");
  }
}

/**
  Set ConfigInfo according to TpmAlgHash.

  @param[in,out] Tcg2ConfigInfo       TCG2 config info.
  @param[in]     TpmAlgHash           TpmAlgHash.

**/
VOID
SetConfigInfo (
  IN OUT TCG2_CONFIGURATION_INFO         *Tcg2ConfigInfo,
  IN UINT32                              TpmAlgHash
  )
{
  switch (TpmAlgHash) {
  case TPM_ALG_SHA1:
    Tcg2ConfigInfo->Sha1Supported = TRUE;
    break;
  case TPM_ALG_SHA256:
    Tcg2ConfigInfo->Sha256Supported = TRUE;
    break;
  case TPM_ALG_SHA384:
    Tcg2ConfigInfo->Sha384Supported = TRUE;
    break;
  case TPM_ALG_SHA512:
    Tcg2ConfigInfo->Sha512Supported = TRUE;
    break;
  case TPM_ALG_SM3_256:
    Tcg2ConfigInfo->Sm3Supported = TRUE;
    break;
  }
}

/**
  Fill Buffer With TCG2EventLogFormat.

  @param[in] Buffer               Buffer to be filled.
  @param[in] BufferSize           Size of buffer.
  @param[in] TCG2EventLogFormat   TCG2EventLogFormat.

**/
VOID
FillBufferWithTCG2EventLogFormat (
  IN UINT16  *Buffer,
  IN UINTN   BufferSize,
  IN UINT32  TCG2EventLogFormat
  )
{
  Buffer[0] = 0;
  if ((TCG2EventLogFormat & EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2) != 0) {
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"TCG_1_2");
  }
  if ((TCG2EventLogFormat & EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) != 0) {
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"TCG_2");
  }
  if ((TCG2EventLogFormat & (~EFI_TCG2_EVENT_LOG_FORMAT_ALL)) != 0) {
    if (Buffer[0] != 0) {
      StrCatS (Buffer, BufferSize / sizeof (CHAR16), L", ");
    }
    StrCatS (Buffer, BufferSize / sizeof (CHAR16), L"UNKNOWN");
  }
}

/**
  Check if buffer is all zero.

  @param[in] Buffer      Buffer to be checked.
  @param[in] BufferSize  Size of buffer to be checked.

  @retval TRUE  Buffer is all zero.
  @retval FALSE Buffer is not all zero.
**/
BOOLEAN
InternalIsZeroBuffer (
  IN VOID  *Buffer,
  IN UINTN BufferSize
  )
{
  UINT8 *BufferData;
  UINTN Index;

  BufferData = Buffer;
  for (Index = 0; Index < BufferSize; Index++) {
    if (BufferData[Index] != 0) {
      return FALSE;
    }
  }
  return TRUE;
}

/**
  This function publish the TCG2 configuration Form for TPM device.

  @param[in, out]  PrivateData   Points to TCG2 configuration private data.

  @retval EFI_SUCCESS            HII Form is installed for this network device.
  @retval EFI_OUT_OF_RESOURCES   Not enough resource for HII Form installation.
  @retval Others                 Other errors as indicated.

**/
EFI_STATUS
InstallTcg2ConfigForm (
  IN OUT TCG2_CONFIG_PRIVATE_DATA  *PrivateData
  )
{
  EFI_STATUS                      Status;
  EFI_HII_HANDLE                  HiiHandle;
  EFI_HANDLE                      DriverHandle;
  EFI_HII_CONFIG_ACCESS_PROTOCOL  *ConfigAccess;
  UINTN                           Index;
  TPML_PCR_SELECTION              Pcrs;
  CHAR16                          TempBuffer[1024];
  TCG2_CONFIGURATION_INFO         Tcg2ConfigInfo;
  UINT8                           TpmDeviceInterfaceDetected;

  DriverHandle = NULL;
  ConfigAccess = &PrivateData->ConfigAccess;
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &DriverHandle,
                  &gEfiDevicePathProtocolGuid,
                  &mTcg2HiiVendorDevicePath,
                  &gEfiHiiConfigAccessProtocolGuid,
                  ConfigAccess,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  PrivateData->DriverHandle = DriverHandle;

  //
  // Publish the HII package list
  //
  HiiHandle = HiiAddPackages (
                &gTcg2ConfigFormSetGuid,
                DriverHandle,
                Tcg2ConfigDxeStrings,
                Tcg2ConfigBin,
                NULL
                );
  if (HiiHandle == NULL) {
    gBS->UninstallMultipleProtocolInterfaces (
           DriverHandle,
           &gEfiDevicePathProtocolGuid,
           &mTcg2HiiVendorDevicePath,
           &gEfiHiiConfigAccessProtocolGuid,
           ConfigAccess,
           NULL
           );  

    return EFI_OUT_OF_RESOURCES;
  }
  
  PrivateData->HiiHandle = HiiHandle;

  //
  // Update static data
  //
  switch (PrivateData->TpmDeviceDetected) {
  case TPM_DEVICE_NULL:
    HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_STATE_CONTENT), L"Not Found", NULL);
    break;
  case TPM_DEVICE_1_2:
    HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_STATE_CONTENT), L"TPM 1.2", NULL);
    break;
  case TPM_DEVICE_2_0_DTPM:
    HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_STATE_CONTENT), L"TPM 2.0", NULL);
    break;
  default:
    HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_STATE_CONTENT), L"Unknown", NULL);
    break;
  }

  ZeroMem (&Tcg2ConfigInfo, sizeof(Tcg2ConfigInfo));
  Status = Tpm2GetCapabilityPcrs (&Pcrs);
  if (EFI_ERROR (Status)) {
    HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TPM2_ACTIVE_HASH_ALGO_CONTENT), L"[Unknown]", NULL);
    HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TPM2_SUPPORTED_HASH_ALGO_CONTENT), L"[Unknown]", NULL);
  } else {
    TempBuffer[0] = 0;
    for (Index = 0; Index < Pcrs.count; Index++) {
      if (!InternalIsZeroBuffer (Pcrs.pcrSelections[Index].pcrSelect, Pcrs.pcrSelections[Index].sizeofSelect)) {
        AppendBufferWithTpmAlgHash (TempBuffer, sizeof(TempBuffer), Pcrs.pcrSelections[Index].hash);
      }
    }
    HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TPM2_ACTIVE_HASH_ALGO_CONTENT), TempBuffer, NULL);

    TempBuffer[0] = 0;
    for (Index = 0; Index < Pcrs.count; Index++) {
      AppendBufferWithTpmAlgHash (TempBuffer, sizeof(TempBuffer), Pcrs.pcrSelections[Index].hash);
      SetConfigInfo (&Tcg2ConfigInfo, Pcrs.pcrSelections[Index].hash);
    }
    HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TPM2_SUPPORTED_HASH_ALGO_CONTENT), TempBuffer, NULL);
  }

  FillBufferWithBootHashAlg (TempBuffer, sizeof(TempBuffer), PcdGet32 (PcdTcg2HashAlgorithmBitmap));
  HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_BIOS_HASH_ALGO_CONTENT), TempBuffer, NULL);

  //
  // Tcg2 Capability
  //
  FillBufferWithTCG2EventLogFormat (TempBuffer, sizeof(TempBuffer), PrivateData->ProtocolCapability.SupportedEventLogs);
  HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_SUPPORTED_EVENT_LOG_FORMAT_CONTENT), TempBuffer, NULL);

  FillBufferWithBootHashAlg (TempBuffer, sizeof(TempBuffer), PrivateData->ProtocolCapability.HashAlgorithmBitmap);
  HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_HASH_ALGO_BITMAP_CONTENT), TempBuffer, NULL);

  UnicodeSPrint (TempBuffer, sizeof (TempBuffer), L"%d", PrivateData->ProtocolCapability.NumberOfPCRBanks);
  HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_NUMBER_OF_PCR_BANKS_CONTENT), TempBuffer, NULL);

  FillBufferWithBootHashAlg (TempBuffer, sizeof(TempBuffer), PrivateData->ProtocolCapability.ActivePcrBanks);
  HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_ACTIVE_PCR_BANKS_CONTENT), TempBuffer, NULL);

  //
  // Update TPM device interface type
  //
  if (PrivateData->TpmDeviceDetected == TPM_DEVICE_2_0_DTPM) {
    TpmDeviceInterfaceDetected = GetPtpInterface ((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
    switch (TpmDeviceInterfaceDetected) {
    case TPM_DEVICE_INTERFACE_TIS:
      HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_INTERFACE_STATE_CONTENT), L"TIS", NULL);
      break;
    case TPM_DEVICE_INTERFACE_PTP_FIFO:
      HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_INTERFACE_STATE_CONTENT), L"PTP FIFO", NULL);
      break;
    case TPM_DEVICE_INTERFACE_PTP_CRB:
      HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_INTERFACE_STATE_CONTENT), L"PTP CRB", NULL);
      break;
     default:
      HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_INTERFACE_STATE_CONTENT), L"Unknown", NULL);
      break;
    }

    Tcg2ConfigInfo.TpmDeviceInterfaceAttempt = TpmDeviceInterfaceDetected;
    switch (TpmDeviceInterfaceDetected) {
    case TPM_DEVICE_INTERFACE_TIS:
      Tcg2ConfigInfo.TpmDeviceInterfacePtpFifoSupported = FALSE;
      Tcg2ConfigInfo.TpmDeviceInterfacePtpCrbSupported  = FALSE;
      HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_INTERFACE_CAPABILITY_CONTENT), L"TIS", NULL);
      break;
    case TPM_DEVICE_INTERFACE_PTP_FIFO:
    case TPM_DEVICE_INTERFACE_PTP_CRB:
      Tcg2ConfigInfo.TpmDeviceInterfacePtpFifoSupported = IsPtpFifoSupported((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
      Tcg2ConfigInfo.TpmDeviceInterfacePtpCrbSupported  = IsPtpCrbSupported((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
      TempBuffer[0] = 0;
      if (Tcg2ConfigInfo.TpmDeviceInterfacePtpFifoSupported) {
        if (TempBuffer[0] != 0) {
          StrCatS (TempBuffer, sizeof(TempBuffer) / sizeof (CHAR16), L", ");
        }
        StrCatS (TempBuffer, sizeof(TempBuffer) / sizeof (CHAR16), L"PTP FIFO");
      }
      if (Tcg2ConfigInfo.TpmDeviceInterfacePtpCrbSupported) {
        if (TempBuffer[0] != 0) {
          StrCatS (TempBuffer, sizeof(TempBuffer) / sizeof (CHAR16), L", ");
        }
        StrCatS (TempBuffer, sizeof(TempBuffer) / sizeof (CHAR16), L"PTP CRB");
      }
      HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_INTERFACE_CAPABILITY_CONTENT), TempBuffer, NULL);
      break;
    default:
      Tcg2ConfigInfo.TpmDeviceInterfacePtpFifoSupported = FALSE;
      Tcg2ConfigInfo.TpmDeviceInterfacePtpCrbSupported  = FALSE;
      HiiSetString (PrivateData->HiiHandle, STRING_TOKEN (STR_TCG2_DEVICE_INTERFACE_CAPABILITY_CONTENT), L"Unknown", NULL);
      break;
    }
  }

  //
  // Set ConfigInfo, to control the check box.
  //
  Status = gRT->SetVariable (
                  TCG2_STORAGE_INFO_NAME,
                  &gTcg2ConfigFormSetGuid,
                  EFI_VARIABLE_BOOTSERVICE_ACCESS,
                  sizeof(Tcg2ConfigInfo),
                  &Tcg2ConfigInfo
                  );
  if (EFI_ERROR (Status)) {
    DEBUG ((EFI_D_ERROR, "Tcg2ConfigDriver: Fail to set TCG2_STORAGE_INFO_NAME\n"));
  }
  return EFI_SUCCESS;  
}

/**
  This function removes TCG2 configuration Form.

  @param[in, out]  PrivateData   Points to TCG2 configuration private data.

**/
VOID
UninstallTcg2ConfigForm (
  IN OUT TCG2_CONFIG_PRIVATE_DATA    *PrivateData
  )
{
  //
  // Uninstall HII package list
  //
  if (PrivateData->HiiHandle != NULL) {
    HiiRemovePackages (PrivateData->HiiHandle);
    PrivateData->HiiHandle = NULL;
  }

  //
  // Uninstall HII Config Access Protocol
  //
  if (PrivateData->DriverHandle != NULL) {
    gBS->UninstallMultipleProtocolInterfaces (
           PrivateData->DriverHandle,
           &gEfiDevicePathProtocolGuid,
           &mTcg2HiiVendorDevicePath,
           &gEfiHiiConfigAccessProtocolGuid,
           &PrivateData->ConfigAccess,
           NULL
           );
    PrivateData->DriverHandle = NULL;
  }
  
  FreePool (PrivateData);
}