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audk/SecurityPkg/Tcg/Tcg2Config/Tcg2ConfigImpl.c

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/** @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, 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 <Guid/TpmInstance.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;
/**
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
)
{
if ((This == NULL) || (Value == NULL) || (ActionRequest == NULL)) {
return EFI_INVALID_PARAMETER;
}
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
IsZeroBuffer (
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;
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 (DTPM)", 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 (!IsZeroBuffer (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);
//
// 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);
}
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