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967eacca JY |
1 | /** @file\r |
2 | Implement TPM2 Context related command.\r | |
3 | \r | |
4 | Copyright (c) 2014, Intel Corporation. All rights reserved. <BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include <IndustryStandard/UefiTcgPlatform.h>\r | |
16 | #include <Library/Tpm2CommandLib.h>\r | |
17 | #include <Library/Tpm2DeviceLib.h>\r | |
18 | #include <Library/BaseMemoryLib.h>\r | |
19 | #include <Library/BaseLib.h>\r | |
20 | #include <Library/DebugLib.h>\r | |
21 | \r | |
22 | #pragma pack(1)\r | |
23 | \r | |
24 | typedef struct {\r | |
25 | TPM2_COMMAND_HEADER Header;\r | |
26 | TPMI_DH_CONTEXT FlushHandle;\r | |
27 | } TPM2_FLUSH_CONTEXT_COMMAND;\r | |
28 | \r | |
29 | typedef struct {\r | |
30 | TPM2_RESPONSE_HEADER Header;\r | |
31 | } TPM2_FLUSH_CONTEXT_RESPONSE;\r | |
32 | \r | |
33 | #pragma pack()\r | |
34 | \r | |
35 | /**\r | |
36 | This command causes all context associated with a loaded object or session to be removed from TPM memory.\r | |
37 | \r | |
38 | @param[in] FlushHandle The handle of the item to flush.\r | |
39 | \r | |
40 | @retval EFI_SUCCESS Operation completed successfully.\r | |
41 | @retval EFI_DEVICE_ERROR The command was unsuccessful.\r | |
42 | **/\r | |
43 | EFI_STATUS\r | |
44 | EFIAPI\r | |
45 | Tpm2FlushContext (\r | |
46 | IN TPMI_DH_CONTEXT FlushHandle\r | |
47 | )\r | |
48 | {\r | |
49 | EFI_STATUS Status;\r | |
50 | TPM2_FLUSH_CONTEXT_COMMAND SendBuffer;\r | |
51 | TPM2_FLUSH_CONTEXT_RESPONSE RecvBuffer;\r | |
52 | UINT32 SendBufferSize;\r | |
53 | UINT32 RecvBufferSize;\r | |
54 | \r | |
55 | //\r | |
56 | // Construct command\r | |
57 | //\r | |
58 | SendBuffer.Header.tag = SwapBytes16(TPM_ST_NO_SESSIONS);\r | |
59 | SendBuffer.Header.commandCode = SwapBytes32(TPM_CC_FlushContext);\r | |
60 | \r | |
61 | SendBuffer.FlushHandle = SwapBytes32 (FlushHandle);\r | |
62 | \r | |
63 | SendBufferSize = (UINT32) sizeof (SendBuffer);\r | |
64 | SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);\r | |
65 | \r | |
66 | //\r | |
67 | // send Tpm command\r | |
68 | //\r | |
69 | RecvBufferSize = sizeof (RecvBuffer);\r | |
70 | Status = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);\r | |
71 | if (EFI_ERROR (Status)) {\r | |
72 | return Status;\r | |
73 | }\r | |
74 | \r | |
75 | if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {\r | |
76 | DEBUG ((EFI_D_ERROR, "Tpm2FlushContext - RecvBufferSize Error - %x\n", RecvBufferSize));\r | |
77 | return EFI_DEVICE_ERROR;\r | |
78 | }\r | |
79 | if (SwapBytes32(RecvBuffer.Header.responseCode) != TPM_RC_SUCCESS) {\r | |
80 | DEBUG ((EFI_D_ERROR, "Tpm2FlushContext - responseCode - %x\n", SwapBytes32(RecvBuffer.Header.responseCode)));\r | |
81 | return EFI_DEVICE_ERROR;\r | |
82 | }\r | |
83 | \r | |
84 | return EFI_SUCCESS;\r | |
85 | }\r | |
86 | \r |