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0c18794e | 1 | /** @file \r |
2 | Utility functions used by TPM Dxe driver.\r | |
3 | \r | |
443bd744 | 4 | Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>\r |
0c18794e | 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/Tpm12.h>\r | |
16 | #include <IndustryStandard/UefiTcgPlatform.h>\r | |
17 | #include <Library/TpmCommLib.h>\r | |
18 | #include <Library/BaseMemoryLib.h>\r | |
19 | \r | |
20 | #include "TpmComm.h"\r | |
21 | \r | |
22 | /**\r | |
23 | Extend a TPM PCR.\r | |
24 | \r | |
25 | @param[in] TpmHandle TPM handle. \r | |
26 | @param[in] DigestToExtend The 160 bit value representing the event to be recorded. \r | |
27 | @param[in] PcrIndex The PCR to be updated.\r | |
28 | @param[out] NewPcrValue New PCR value after extend. \r | |
29 | \r | |
30 | @retval EFI_SUCCESS Operation completed successfully.\r | |
31 | @retval EFI_DEVICE_ERROR The command was unsuccessful.\r | |
32 | \r | |
33 | **/\r | |
34 | EFI_STATUS\r | |
35 | TpmCommExtend (\r | |
36 | IN TIS_TPM_HANDLE TpmHandle,\r | |
37 | IN TPM_DIGEST *DigestToExtend,\r | |
38 | IN TPM_PCRINDEX PcrIndex,\r | |
39 | OUT TPM_DIGEST *NewPcrValue\r | |
40 | )\r | |
41 | {\r | |
42 | EFI_STATUS Status;\r | |
43 | TPM_DIGEST NewValue;\r | |
44 | TPM_RQU_COMMAND_HDR CmdHdr;\r | |
45 | TPM_RSP_COMMAND_HDR RspHdr;\r | |
46 | \r | |
47 | if (NewPcrValue == NULL) {\r | |
48 | NewPcrValue = &NewValue;\r | |
49 | }\r | |
50 | \r | |
51 | CmdHdr.tag = TPM_TAG_RQU_COMMAND;\r | |
52 | CmdHdr.paramSize =\r | |
53 | sizeof (CmdHdr) + sizeof (PcrIndex) + sizeof (*DigestToExtend);\r | |
54 | CmdHdr.ordinal = TPM_ORD_Extend;\r | |
55 | Status = TisPcExecute (\r | |
56 | TpmHandle,\r | |
57 | "%h%d%r%/%h%r",\r | |
58 | &CmdHdr,\r | |
59 | PcrIndex,\r | |
60 | DigestToExtend,\r | |
61 | (UINTN)sizeof (*DigestToExtend),\r | |
62 | &RspHdr,\r | |
63 | NewPcrValue,\r | |
64 | (UINTN)sizeof (*NewPcrValue)\r | |
65 | );\r | |
66 | if (EFI_ERROR (Status)) {\r | |
67 | return Status;\r | |
68 | }\r | |
69 | if (RspHdr.returnCode != 0) {\r | |
70 | return EFI_DEVICE_ERROR;\r | |
71 | }\r | |
72 | return EFI_SUCCESS;\r | |
73 | }\r | |
74 | \r | |
75 | /**\r | |
76 | Get TPM capability flags.\r | |
77 | \r | |
78 | @param[in] TpmHandle TPM handle. \r | |
79 | @param[in] FlagSubcap Flag subcap. \r | |
80 | @param[out] FlagBuffer Pointer to the buffer for returned flag structure.\r | |
81 | @param[in] FlagSize Size of the buffer. \r | |
82 | \r | |
83 | @retval EFI_SUCCESS Operation completed successfully.\r | |
84 | @retval EFI_DEVICE_ERROR The command was unsuccessful.\r | |
85 | \r | |
86 | **/\r | |
87 | EFI_STATUS\r | |
88 | TpmCommGetFlags (\r | |
89 | IN TIS_TPM_HANDLE TpmHandle,\r | |
90 | IN UINT32 FlagSubcap,\r | |
91 | OUT VOID *FlagBuffer,\r | |
92 | IN UINTN FlagSize\r | |
93 | )\r | |
94 | {\r | |
95 | EFI_STATUS Status;\r | |
96 | TPM_RQU_COMMAND_HDR CmdHdr;\r | |
97 | TPM_RSP_COMMAND_HDR RspHdr;\r | |
98 | UINT32 Size;\r | |
99 | \r | |
100 | CmdHdr.tag = TPM_TAG_RQU_COMMAND;\r | |
101 | CmdHdr.paramSize = sizeof (CmdHdr) + sizeof (UINT32) * 3;\r | |
102 | CmdHdr.ordinal = TPM_ORD_GetCapability;\r | |
103 | \r | |
104 | Status = TisPcExecute (\r | |
105 | TpmHandle,\r | |
106 | "%h%d%d%d%/%h%d%r",\r | |
107 | &CmdHdr,\r | |
108 | TPM_CAP_FLAG,\r | |
109 | sizeof (FlagSubcap),\r | |
110 | FlagSubcap,\r | |
111 | &RspHdr,\r | |
112 | &Size,\r | |
113 | FlagBuffer,\r | |
114 | FlagSize\r | |
115 | );\r | |
116 | if (EFI_ERROR (Status)) {\r | |
117 | return Status;\r | |
118 | }\r | |
119 | if (RspHdr.returnCode != 0) {\r | |
120 | return EFI_DEVICE_ERROR;\r | |
121 | }\r | |
122 | return EFI_SUCCESS;\r | |
123 | }\r | |
124 | \r | |
125 | /**\r | |
126 | Add a new entry to the Event Log.\r | |
127 | \r | |
128 | @param[in, out] EventLogPtr Pointer to the Event Log data. \r | |
129 | @param[in, out] LogSize Size of the Event Log. \r | |
130 | @param[in] MaxSize Maximum size of the Event Log.\r | |
131 | @param[in] NewEventHdr Pointer to a TCG_PCR_EVENT_HDR data structure. \r | |
132 | @param[in] NewEventData Pointer to the new event data. \r | |
133 | \r | |
134 | @retval EFI_SUCCESS The new event log entry was added.\r | |
135 | @retval EFI_OUT_OF_RESOURCES No enough memory to log the new event.\r | |
136 | \r | |
137 | **/\r | |
138 | EFI_STATUS\r | |
139 | TpmCommLogEvent (\r | |
140 | IN OUT UINT8 **EventLogPtr,\r | |
141 | IN OUT UINTN *LogSize,\r | |
142 | IN UINTN MaxSize,\r | |
143 | IN TCG_PCR_EVENT_HDR *NewEventHdr,\r | |
144 | IN UINT8 *NewEventData\r | |
145 | )\r | |
146 | {\r | |
443bd744 CZ |
147 | UINTN NewLogSize;\r |
148 | \r | |
149 | //\r | |
150 | // Prevent Event Overflow\r | |
151 | //\r | |
152 | if (NewEventHdr->EventSize > (UINTN)(~0) - sizeof (*NewEventHdr)) {\r | |
153 | return EFI_OUT_OF_RESOURCES;\r | |
154 | }\r | |
0c18794e | 155 | \r |
156 | NewLogSize = sizeof (*NewEventHdr) + NewEventHdr->EventSize;\r | |
443bd744 | 157 | if (NewLogSize > MaxSize - *LogSize) {\r |
0c18794e | 158 | return EFI_OUT_OF_RESOURCES;\r |
159 | }\r | |
160 | \r | |
161 | *EventLogPtr += *LogSize;\r | |
162 | *LogSize += NewLogSize;\r | |
163 | CopyMem (*EventLogPtr, NewEventHdr, sizeof (*NewEventHdr));\r | |
164 | CopyMem (\r | |
165 | *EventLogPtr + sizeof (*NewEventHdr),\r | |
166 | NewEventData,\r | |
167 | NewEventHdr->EventSize\r | |
168 | );\r | |
169 | return EFI_SUCCESS;\r | |
170 | }\r |