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/** @file
Implement TPM1.2 PCR related commands.
Copyright (c) 2016, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Library/Tpm12CommandLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/Tpm12DeviceLib.h>
#pragma pack(1)
typedef struct {
TPM_RQU_COMMAND_HDR Hdr;
TPM_PCRINDEX PcrIndex;
TPM_DIGEST TpmDigest;
} TPM_CMD_EXTEND;
typedef struct {
TPM_RSP_COMMAND_HDR Hdr;
TPM_DIGEST TpmDigest;
} TPM_RSP_EXTEND;
#pragma pack()
/**
Extend a TPM PCR.
@param[in] DigestToExtend The 160 bit value representing the event to be recorded.
@param[in] PcrIndex The PCR to be updated.
@param[out] NewPcrValue New PCR value after extend.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_TIMEOUT The register can't run into the expected status in time.
@retval EFI_BUFFER_TOO_SMALL Response data buffer is too small.
@retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
EFIAPI
Tpm12Extend (
IN TPM_DIGEST *DigestToExtend,
IN TPM_PCRINDEX PcrIndex,
OUT TPM_DIGEST *NewPcrValue
)
{
EFI_STATUS Status;
TPM_CMD_EXTEND Command;
TPM_RSP_EXTEND Response;
UINT32 Length;
//
// send Tpm command TPM_ORD_Extend
//
Command.Hdr.tag = SwapBytes16 (TPM_TAG_RQU_COMMAND);
Command.Hdr.paramSize = SwapBytes32 (sizeof (Command));
Command.Hdr.ordinal = SwapBytes32 (TPM_ORD_Extend);
Command.PcrIndex = SwapBytes32 (PcrIndex);
CopyMem (&Command.TpmDigest, DigestToExtend, sizeof (Command.TpmDigest));
Length = sizeof (Response);
Status = Tpm12SubmitCommand (sizeof (Command), (UINT8 *)&Command, &Length, (UINT8 *)&Response);
if (EFI_ERROR (Status)) {
return Status;
}
if (SwapBytes32 (Response.Hdr.returnCode) != TPM_SUCCESS) {
DEBUG ((DEBUG_ERROR, "Tpm12Extend: Response Code error! 0x%08x\r\n", SwapBytes32 (Response.Hdr.returnCode)));
return EFI_DEVICE_ERROR;
}
if (NewPcrValue != NULL) {
CopyMem (NewPcrValue, &Response.TpmDigest, sizeof (*NewPcrValue));
}
return Status;
}
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