1 /** @file
2   Implement TPM1.2 Ownership related command.
3 
4 Copyright (c) 2013 - 2014, 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 <Uefi.h>
16 #include <IndustryStandard/Tpm12.h>
17 #include <Library/BaseMemoryLib.h>
18 #include <Library/BaseLib.h>
19 #include <Library/Tpm12DeviceLib.h>
20 
21 #pragma pack(1)
22 
23 typedef struct {
24   TPM_RQU_COMMAND_HDR   Hdr;
25 } TPM_CMD_FORCE_CLEAR;
26 
27 typedef struct {
28   TPM_RSP_COMMAND_HDR   Hdr;
29 } TPM_RSP_FORCE_CLEAR;
30 
31 #pragma pack()
32 
33 /**
34   Send ForceClear command to TPM1.2.
35 
36   @retval EFI_SUCCESS      Operation completed successfully.
37   @retval EFI_DEVICE_ERROR Unexpected device behavior.
38 **/
39 EFI_STATUS
40 EFIAPI
Tpm12ForceClear(VOID)41 Tpm12ForceClear (
42   VOID
43   )
44 {
45   EFI_STATUS                        Status;
46   UINT32                            TpmRecvSize;
47   UINT32                            TpmSendSize;
48   TPM_CMD_FORCE_CLEAR               SendBuffer;
49   TPM_RSP_FORCE_CLEAR               RecvBuffer;
50   UINT32                            ReturnCode;
51 
52   //
53   // send Tpm command TPM_ORD_ForceClear
54   //
55   TpmRecvSize               = sizeof (TPM_RSP_FORCE_CLEAR);
56   TpmSendSize               = sizeof (TPM_CMD_FORCE_CLEAR);
57   SendBuffer.Hdr.tag        = SwapBytes16 (TPM_TAG_RQU_COMMAND);
58   SendBuffer.Hdr.paramSize  = SwapBytes32 (TpmSendSize);
59   SendBuffer.Hdr.ordinal    = SwapBytes32 (TPM_ORD_ForceClear);
60 
61   Status = Tpm12SubmitCommand (TpmSendSize, (UINT8 *)&SendBuffer, &TpmRecvSize, (UINT8 *)&RecvBuffer);
62   if (EFI_ERROR (Status)) {
63     return Status;
64   }
65   ReturnCode = SwapBytes32(RecvBuffer.Hdr.returnCode);
66   switch (ReturnCode) {
67   case TPM_SUCCESS:
68     return EFI_SUCCESS;
69   default:
70     return EFI_DEVICE_ERROR;
71   }
72 }