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/** @file
Implement the InternalTpm12Detect() function on top of the Tpm12DeviceLib
class.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/Tpm12DeviceLib.h>
#include "Tpm12Support.h"
#pragma pack (1)
typedef struct {
TPM_RSP_COMMAND_HDR Hdr;
TPM_CURRENT_TICKS CurrentTicks;
} TPM_RSP_GET_TICKS;
#pragma pack ()
/**
Probe for the TPM for 1.2 version, by sending TPM1.2 GetTicks
Sending a TPM1.2 command to a TPM2 should return a TPM1.2
header (tag = 0xc4) and error code (TPM_BADTAG = 0x1e)
@retval EFI_SUCCESS TPM version 1.2 probing successful.
@return Error codes propagated from Tpm12SubmitCommand().
**/
STATIC
EFI_STATUS
TestTpm12 (
)
{
EFI_STATUS Status;
TPM_RQU_COMMAND_HDR Command;
TPM_RSP_GET_TICKS Response;
UINT32 Length;
Command.tag = SwapBytes16 (TPM_TAG_RQU_COMMAND);
Command.paramSize = SwapBytes32 (sizeof (Command));
Command.ordinal = SwapBytes32 (TPM_ORD_GetTicks);
Length = sizeof (Response);
Status = Tpm12SubmitCommand (sizeof (Command), (UINT8 *)&Command, &Length,
(UINT8 *)&Response);
if (EFI_ERROR (Status)) {
return Status;
}
return EFI_SUCCESS;
}
/**
Detect the presence of a TPM with interface version 1.2.
@retval EFI_SUCCESS TPM-1.2 available. The Tpm12RequestUseTpm() and
Tpm12SubmitCommand(TPM_ORD_GetTicks) operations
(from the Tpm12DeviceLib class) have succeeded.
@return Error codes propagated from Tpm12RequestUseTpm() and
Tpm12SubmitCommand().
**/
EFI_STATUS
InternalTpm12Detect (
VOID
)
{
EFI_STATUS Status;
Status = Tpm12RequestUseTpm ();
if (EFI_ERROR (Status)) {
return Status;
}
return TestTpm12 ();
}
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