1 /** @file
2 Implement TPM2 Context related command.
3
4 Copyright (c) 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 <IndustryStandard/UefiTcgPlatform.h>
16 #include <Library/Tpm2CommandLib.h>
17 #include <Library/Tpm2DeviceLib.h>
18 #include <Library/BaseMemoryLib.h>
19 #include <Library/BaseLib.h>
20 #include <Library/DebugLib.h>
21
22 #pragma pack(1)
23
24 typedef struct {
25 TPM2_COMMAND_HEADER Header;
26 TPMI_DH_CONTEXT FlushHandle;
27 } TPM2_FLUSH_CONTEXT_COMMAND;
28
29 typedef struct {
30 TPM2_RESPONSE_HEADER Header;
31 } TPM2_FLUSH_CONTEXT_RESPONSE;
32
33 #pragma pack()
34
35 /**
36 This command causes all context associated with a loaded object or session to be removed from TPM memory.
37
38 @param[in] FlushHandle The handle of the item to flush.
39
40 @retval EFI_SUCCESS Operation completed successfully.
41 @retval EFI_DEVICE_ERROR The command was unsuccessful.
42 **/
43 EFI_STATUS
44 EFIAPI
Tpm2FlushContext(IN TPMI_DH_CONTEXT FlushHandle)45 Tpm2FlushContext (
46 IN TPMI_DH_CONTEXT FlushHandle
47 )
48 {
49 EFI_STATUS Status;
50 TPM2_FLUSH_CONTEXT_COMMAND SendBuffer;
51 TPM2_FLUSH_CONTEXT_RESPONSE RecvBuffer;
52 UINT32 SendBufferSize;
53 UINT32 RecvBufferSize;
54
55 //
56 // Construct command
57 //
58 SendBuffer.Header.tag = SwapBytes16(TPM_ST_NO_SESSIONS);
59 SendBuffer.Header.commandCode = SwapBytes32(TPM_CC_FlushContext);
60
61 SendBuffer.FlushHandle = SwapBytes32 (FlushHandle);
62
63 SendBufferSize = (UINT32) sizeof (SendBuffer);
64 SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);
65
66 //
67 // send Tpm command
68 //
69 RecvBufferSize = sizeof (RecvBuffer);
70 Status = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
71 if (EFI_ERROR (Status)) {
72 return Status;
73 }
74
75 if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
76 DEBUG ((EFI_D_ERROR, "Tpm2FlushContext - RecvBufferSize Error - %x\n", RecvBufferSize));
77 return EFI_DEVICE_ERROR;
78 }
79 if (SwapBytes32(RecvBuffer.Header.responseCode) != TPM_RC_SUCCESS) {
80 DEBUG ((EFI_D_ERROR, "Tpm2FlushContext - responseCode - %x\n", SwapBytes32(RecvBuffer.Header.responseCode)));
81 return EFI_DEVICE_ERROR;
82 }
83
84 return EFI_SUCCESS;
85 }
86
87