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/** @file
This library is TPM12 TCG protocol lib.
Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/Tpm12DeviceLib.h>
#include <Protocol/TcgService.h>
#include <IndustryStandard/Tpm12.h>
EFI_TCG_PROTOCOL *mTcgProtocol = NULL;
/**
This service enables the sending of commands to the TPM12.
@param[in] InputParameterBlockSize Size of the TPM12 input parameter block.
@param[in] InputParameterBlock Pointer to the TPM12 input parameter block.
@param[in,out] OutputParameterBlockSize Size of the TPM12 output parameter block.
@param[in] OutputParameterBlock Pointer to the TPM12 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
Tpm12SubmitCommand (
IN UINT32 InputParameterBlockSize,
IN UINT8 *InputParameterBlock,
IN OUT UINT32 *OutputParameterBlockSize,
IN UINT8 *OutputParameterBlock
)
{
EFI_STATUS Status;
TPM_RSP_COMMAND_HDR *Header;
if (mTcgProtocol == NULL) {
Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **)&mTcgProtocol);
if (EFI_ERROR (Status)) {
//
// TCG protocol is not installed. So, TPM12 is not present.
//
DEBUG ((DEBUG_ERROR, "Tpm12SubmitCommand - TCG - %r\n", Status));
return EFI_NOT_FOUND;
}
}
//
// Assume when TCG Protocol is ready, RequestUseTpm already done.
//
Status = mTcgProtocol->PassThroughToTpm (
mTcgProtocol,
InputParameterBlockSize,
InputParameterBlock,
*OutputParameterBlockSize,
OutputParameterBlock
);
if (EFI_ERROR (Status)) {
return Status;
}
Header = (TPM_RSP_COMMAND_HDR *)OutputParameterBlock;
*OutputParameterBlockSize = SwapBytes32 (Header->paramSize);
return EFI_SUCCESS;
}
/**
This service requests use TPM12.
@retval EFI_SUCCESS Get the control of TPM12 chip.
@retval EFI_NOT_FOUND TPM12 not found.
@retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
EFIAPI
Tpm12RequestUseTpm (
VOID
)
{
EFI_STATUS Status;
if (mTcgProtocol == NULL) {
Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **)&mTcgProtocol);
if (EFI_ERROR (Status)) {
//
// TCG protocol is not installed. So, TPM12 is not present.
//
DEBUG ((DEBUG_ERROR, "Tpm12RequestUseTpm - TCG - %r\n", Status));
return EFI_NOT_FOUND;
}
}
//
// Assume when TCG Protocol is ready, RequestUseTpm already done.
//
return EFI_SUCCESS;
}
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