89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/** @file
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Implement TCM PCR related commands.
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;******************************************************************************
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;* Copyright (c) 2019, Insyde Software Corp. All Rights Reserved.
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;*
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;* You may not reproduce, distribute, publish, display, perform, modify, adapt,
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;* transmit, broadcast, present, recite, release, license or otherwise exploit
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;* any part of this publication in any form, by any means, without the prior
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;* written permission of Insyde Software Corporation.
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;*
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;******************************************************************************
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**/
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#include <PiPei.h>
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#include <Library/TcmCommandLib.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/TcmDeviceLib.h>
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#pragma pack(1)
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typedef struct {
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TCM_RQU_COMMAND_HDR Hdr;
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TCM_PCRINDEX PcrIndex;
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TCM_DIGEST TcmDigest;
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} TCM_CMD_EXTEND;
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typedef struct {
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TCM_RSP_COMMAND_HDR Hdr;
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TCM_DIGEST TcmDigest;
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} TCM_RSP_EXTEND;
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#pragma pack()
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/**
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Extend a TCM PCR.
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@param[in] DigestToExtend The 160 bit value representing the event to be recorded.
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@param[in] PcrIndex The PCR to be updated.
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@param[out] NewPcrValue New PCR value after extend.
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@retval EFI_SUCCESS Operation completed successfully.
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@retval EFI_TIMEOUT The register can't run into the expected status in time.
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@retval EFI_BUFFER_TOO_SMALL Response data buffer is too small.
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@retval EFI_DEVICE_ERROR Unexpected device behavior.
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**/
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EFI_STATUS
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EFIAPI
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TcmExtend (
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IN TCM_DIGEST *DigestToExtend,
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IN TCM_PCRINDEX PcrIndex,
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OUT TCM_DIGEST *NewPcrValue
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)
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{
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EFI_STATUS Status;
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TCM_CMD_EXTEND Command;
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TCM_RSP_EXTEND Response;
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UINT32 Length;
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//
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// send Tcm command TCM_ORD_Extend
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//
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Command.Hdr.tag = SwapBytes16 (TCM_TAG_RQU_COMMAND);
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Command.Hdr.paramSize = SwapBytes32 (sizeof (Command));
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Command.Hdr.ordinal = SwapBytes32 (TCM_ORD_Extend);
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Command.PcrIndex = SwapBytes32 (PcrIndex);
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CopyMem (&Command.TcmDigest, DigestToExtend, sizeof (Command.TcmDigest));
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Length = sizeof (Response);
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Status = TcmSubmitCommand (sizeof (Command), (UINT8 *)&Command, &Length, (UINT8 *)&Response);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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if (SwapBytes32(Response.Hdr.returnCode) != TCM_SUCCESS) {
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DEBUG ((EFI_D_ERROR, "TcmExtend: Response Code error! 0x%08x\r\n", SwapBytes32(Response.Hdr.returnCode)));
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return EFI_DEVICE_ERROR;
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}
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if (NewPcrValue != NULL) {
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CopyMem (NewPcrValue, &Response.TcmDigest, sizeof (*NewPcrValue));
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}
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return Status;
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}
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