1 /** @file
2 Implement TPM1.2 PCR related commands.
3
4 Copyright (c) 2016, Intel Corporation. All rights reserved. <BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15 #include <PiPei.h>
16 #include <Library/Tpm12CommandLib.h>
17 #include <Library/BaseLib.h>
18 #include <Library/DebugLib.h>
19 #include <Library/BaseMemoryLib.h>
20 #include <Library/Tpm12DeviceLib.h>
21
22 #pragma pack(1)
23
24 typedef struct {
25 TPM_RQU_COMMAND_HDR Hdr;
26 TPM_PCRINDEX PcrIndex;
27 TPM_DIGEST TpmDigest;
28 } TPM_CMD_EXTEND;
29
30 typedef struct {
31 TPM_RSP_COMMAND_HDR Hdr;
32 TPM_DIGEST TpmDigest;
33 } TPM_RSP_EXTEND;
34
35 #pragma pack()
36
37 /**
38 Extend a TPM PCR.
39
40 @param[in] DigestToExtend The 160 bit value representing the event to be recorded.
41 @param[in] PcrIndex The PCR to be updated.
42 @param[out] NewPcrValue New PCR value after extend.
43
44 @retval EFI_SUCCESS Operation completed successfully.
45 @retval EFI_TIMEOUT The register can't run into the expected status in time.
46 @retval EFI_BUFFER_TOO_SMALL Response data buffer is too small.
47 @retval EFI_DEVICE_ERROR Unexpected device behavior.
48
49 **/
50 EFI_STATUS
51 EFIAPI
Tpm12Extend(IN TPM_DIGEST * DigestToExtend,IN TPM_PCRINDEX PcrIndex,OUT TPM_DIGEST * NewPcrValue)52 Tpm12Extend (
53 IN TPM_DIGEST *DigestToExtend,
54 IN TPM_PCRINDEX PcrIndex,
55 OUT TPM_DIGEST *NewPcrValue
56 )
57 {
58 EFI_STATUS Status;
59 TPM_CMD_EXTEND Command;
60 TPM_RSP_EXTEND Response;
61 UINT32 Length;
62
63 //
64 // send Tpm command TPM_ORD_Extend
65 //
66 Command.Hdr.tag = SwapBytes16 (TPM_TAG_RQU_COMMAND);
67 Command.Hdr.paramSize = SwapBytes32 (sizeof (Command));
68 Command.Hdr.ordinal = SwapBytes32 (TPM_ORD_Extend);
69 Command.PcrIndex = SwapBytes32 (PcrIndex);
70 CopyMem (&Command.TpmDigest, DigestToExtend, sizeof (Command.TpmDigest));
71 Length = sizeof (Response);
72 Status = Tpm12SubmitCommand (sizeof (Command), (UINT8 *)&Command, &Length, (UINT8 *)&Response);
73 if (EFI_ERROR (Status)) {
74 return Status;
75 }
76
77 if (SwapBytes32(Response.Hdr.returnCode) != TPM_SUCCESS) {
78 DEBUG ((EFI_D_ERROR, "Tpm12Extend: Response Code error! 0x%08x\r\n", SwapBytes32(Response.Hdr.returnCode)));
79 return EFI_DEVICE_ERROR;
80 }
81
82 if (NewPcrValue != NULL) {
83 CopyMem (NewPcrValue, &Response.TpmDigest, sizeof (*NewPcrValue));
84 }
85
86 return Status;
87 }
88