1 /** @file
2 Implement TPM1.2 PCR related commands.
3
4 Copyright (c) 2016, Intel Corporation. All rights reserved. <BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
6
7 **/
8
9 #include <PiPei.h>
10 #include <Library/Tpm12CommandLib.h>
11 #include <Library/BaseLib.h>
12 #include <Library/DebugLib.h>
13 #include <Library/BaseMemoryLib.h>
14 #include <Library/Tpm12DeviceLib.h>
15
16 #pragma pack(1)
17
18 typedef struct {
19 TPM_RQU_COMMAND_HDR Hdr;
20 TPM_PCRINDEX PcrIndex;
21 TPM_DIGEST TpmDigest;
22 } TPM_CMD_EXTEND;
23
24 typedef struct {
25 TPM_RSP_COMMAND_HDR Hdr;
26 TPM_DIGEST TpmDigest;
27 } TPM_RSP_EXTEND;
28
29 #pragma pack()
30
31 /**
32 Extend a TPM PCR.
33
34 @param[in] DigestToExtend The 160 bit value representing the event to be recorded.
35 @param[in] PcrIndex The PCR to be updated.
36 @param[out] NewPcrValue New PCR value after extend.
37
38 @retval EFI_SUCCESS Operation completed successfully.
39 @retval EFI_TIMEOUT The register can't run into the expected status in time.
40 @retval EFI_BUFFER_TOO_SMALL Response data buffer is too small.
41 @retval EFI_DEVICE_ERROR Unexpected device behavior.
42
43 **/
44 EFI_STATUS
45 EFIAPI
Tpm12Extend(IN TPM_DIGEST * DigestToExtend,IN TPM_PCRINDEX PcrIndex,OUT TPM_DIGEST * NewPcrValue)46 Tpm12Extend (
47 IN TPM_DIGEST *DigestToExtend,
48 IN TPM_PCRINDEX PcrIndex,
49 OUT TPM_DIGEST *NewPcrValue
50 )
51 {
52 EFI_STATUS Status;
53 TPM_CMD_EXTEND Command;
54 TPM_RSP_EXTEND Response;
55 UINT32 Length;
56
57 //
58 // send Tpm command TPM_ORD_Extend
59 //
60 Command.Hdr.tag = SwapBytes16 (TPM_TAG_RQU_COMMAND);
61 Command.Hdr.paramSize = SwapBytes32 (sizeof (Command));
62 Command.Hdr.ordinal = SwapBytes32 (TPM_ORD_Extend);
63 Command.PcrIndex = SwapBytes32 (PcrIndex);
64 CopyMem (&Command.TpmDigest, DigestToExtend, sizeof (Command.TpmDigest));
65 Length = sizeof (Response);
66 Status = Tpm12SubmitCommand (sizeof (Command), (UINT8 *)&Command, &Length, (UINT8 *)&Response);
67 if (EFI_ERROR (Status)) {
68 return Status;
69 }
70
71 if (SwapBytes32(Response.Hdr.returnCode) != TPM_SUCCESS) {
72 DEBUG ((EFI_D_ERROR, "Tpm12Extend: Response Code error! 0x%08x\r\n", SwapBytes32(Response.Hdr.returnCode)));
73 return EFI_DEVICE_ERROR;
74 }
75
76 if (NewPcrValue != NULL) {
77 CopyMem (NewPcrValue, &Response.TpmDigest, sizeof (*NewPcrValue));
78 }
79
80 return Status;
81 }
82