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