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/** @file
This library is TPM2 TCG2 protocol lib.
Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Protocol/Tcg2Protocol.h>
#include <IndustryStandard/Tpm20.h>
EFI_TCG2_PROTOCOL *mTcg2Protocol = NULL;
/**
This service enables the sending of commands to the TPM2.
@param[in] InputParameterBlockSize Size of the TPM2 input parameter block.
@param[in] InputParameterBlock Pointer to the TPM2 input parameter block.
@param[in,out] OutputParameterBlockSize Size of the TPM2 output parameter block.
@param[in] OutputParameterBlock Pointer to the TPM2 output parameter block.
@retval EFI_SUCCESS The command byte stream was successfully sent to the device and a response was successfully received.
@retval EFI_DEVICE_ERROR The command was not successfully sent to the device or a response was not successfully received from the device.
@retval EFI_BUFFER_TOO_SMALL The output parameter block is too small.
**/
EFI_STATUS
EFIAPI
Tpm2SubmitCommand (
IN UINT32 InputParameterBlockSize,
IN UINT8 *InputParameterBlock,
IN OUT UINT32 *OutputParameterBlockSize,
IN UINT8 *OutputParameterBlock
)
{
EFI_STATUS Status;
TPM2_RESPONSE_HEADER *Header;
if (mTcg2Protocol == NULL) {
Status = gBS->LocateProtocol (&gEfiTcg2ProtocolGuid, NULL, (VOID **)&mTcg2Protocol);
if (EFI_ERROR (Status)) {
//
// Tcg2 protocol is not installed. So, TPM2 is not present.
//
DEBUG ((DEBUG_ERROR, "Tpm2SubmitCommand - Tcg2 - %r\n", Status));
return EFI_NOT_FOUND;
}
}
//
// Assume when Tcg2 Protocol is ready, RequestUseTpm already done.
//
Status = mTcg2Protocol->SubmitCommand (
mTcg2Protocol,
InputParameterBlockSize,
InputParameterBlock,
*OutputParameterBlockSize,
OutputParameterBlock
);
if (EFI_ERROR (Status)) {
return Status;
}
Header = (TPM2_RESPONSE_HEADER *)OutputParameterBlock;
*OutputParameterBlockSize = SwapBytes32 (Header->paramSize);
return EFI_SUCCESS;
}
/**
This service requests use TPM2.
@retval EFI_SUCCESS Get the control of TPM2 chip.
@retval EFI_NOT_FOUND TPM2 not found.
@retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
EFIAPI
Tpm2RequestUseTpm (
VOID
)
{
EFI_STATUS Status;
if (mTcg2Protocol == NULL) {
Status = gBS->LocateProtocol (&gEfiTcg2ProtocolGuid, NULL, (VOID **)&mTcg2Protocol);
if (EFI_ERROR (Status)) {
//
// Tcg2 protocol is not installed. So, TPM2 is not present.
//
DEBUG ((DEBUG_ERROR, "Tpm2RequestUseTpm - Tcg2 - %r\n", Status));
return EFI_NOT_FOUND;
}
}
//
// Assume when Tcg2 Protocol is ready, RequestUseTpm already done.
//
return EFI_SUCCESS;
}
/**
This service register TPM2 device.
@param Tpm2Device TPM2 device
@retval EFI_SUCCESS This TPM2 device is registered successfully.
@retval EFI_UNSUPPORTED System does not support register this TPM2 device.
@retval EFI_ALREADY_STARTED System already register this TPM2 device.
**/
EFI_STATUS
EFIAPI
Tpm2RegisterTpm2DeviceLib (
IN TPM2_DEVICE_INTERFACE *Tpm2Device
)
{
return EFI_UNSUPPORTED;
}
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