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0c18794e | 1 | /** @file\r |
2 | TIS (TPM Interface Specification) functions used by TPM PEI driver.\r | |
3 | \r | |
4 | Copyright (c) 2005 - 2011, 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/Tpm12.h>\r | |
16 | #include <IndustryStandard/UefiTcgPlatform.h>\r | |
17 | #include <Library/TpmCommLib.h>\r | |
18 | #include <Library/DebugLib.h>\r | |
19 | #include <Library/BaseLib.h>\r | |
20 | #include <Library/IoLib.h>\r | |
21 | #include <Library/BaseMemoryLib.h>\r | |
22 | \r | |
23 | /**\r | |
24 | Send a command to TPM for execution and return response data.\r | |
25 | \r | |
26 | @param[in] PeiServices Describes the list of possible PEI Services.\r | |
27 | @param[in] TisReg TPM register space base address. \r | |
28 | @param[in] BufferIn Buffer for command data. \r | |
29 | @param[in] SizeIn Size of command data. \r | |
30 | @param[in, out] BufferOut Buffer for response data. \r | |
31 | @param[in, out] SizeOut Size of response data. \r | |
32 | \r | |
33 | @retval EFI_SUCCESS Operation completed successfully.\r | |
34 | @retval EFI_TIMEOUT The register can't run into the expected status in time.\r | |
35 | @retval EFI_BUFFER_TOO_SMALL Response data buffer is too small.\r | |
36 | @retval EFI_DEVICE_ERROR Unexpected device behavior.\r | |
37 | \r | |
38 | **/\r | |
39 | EFI_STATUS\r | |
40 | TisTpmCommand (\r | |
41 | IN EFI_PEI_SERVICES **PeiServices,\r | |
42 | IN TIS_PC_REGISTERS_PTR TisReg,\r | |
43 | IN UINT8 *BufferIn,\r | |
44 | IN UINT32 SizeIn,\r | |
45 | IN OUT UINT8 *BufferOut,\r | |
46 | IN OUT UINT32 *SizeOut\r | |
47 | )\r | |
48 | {\r | |
49 | EFI_STATUS Status;\r | |
50 | UINT16 BurstCount;\r | |
51 | UINT32 Index;\r | |
52 | UINT32 TpmOutSize;\r | |
53 | UINT16 Data16;\r | |
54 | UINT32 Data32;\r | |
55 | \r | |
56 | Status = TisPcPrepareCommand (TisReg);\r | |
57 | if (EFI_ERROR (Status)){\r | |
58 | DEBUG ((DEBUG_ERROR, "Tpm is not ready for command!\n"));\r | |
59 | return Status;\r | |
60 | }\r | |
61 | //\r | |
62 | // Send the command data to Tpm\r | |
63 | //\r | |
64 | Index = 0;\r | |
65 | while (Index < SizeIn) {\r | |
66 | Status = TisPcReadBurstCount (TisReg, &BurstCount);\r | |
67 | if (EFI_ERROR (Status)) {\r | |
68 | Status = EFI_TIMEOUT;\r | |
69 | goto Exit;\r | |
70 | }\r | |
71 | for (; BurstCount > 0 && Index < SizeIn; BurstCount--) {\r | |
72 | MmioWrite8((UINTN)&TisReg->DataFifo, *(BufferIn + Index));\r | |
73 | Index++;\r | |
74 | }\r | |
75 | }\r | |
76 | //\r | |
77 | // Check the Tpm status STS_EXPECT change from 1 to 0\r | |
78 | //\r | |
79 | Status = TisPcWaitRegisterBits (\r | |
80 | &TisReg->Status,\r | |
81 | (UINT8) TIS_PC_VALID,\r | |
82 | TIS_PC_STS_EXPECT,\r | |
83 | TIS_TIMEOUT_C\r | |
84 | );\r | |
85 | if (EFI_ERROR (Status)) {\r | |
86 | DEBUG ((DEBUG_ERROR, "The send buffer too small!\n"));\r | |
87 | Status = EFI_BUFFER_TOO_SMALL;\r | |
88 | goto Exit;\r | |
89 | }\r | |
90 | //\r | |
91 | // Executed the TPM command and waiting for the response data ready\r | |
92 | //\r | |
93 | MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_GO);\r | |
94 | Status = TisPcWaitRegisterBits (\r | |
95 | &TisReg->Status,\r | |
96 | (UINT8) (TIS_PC_VALID | TIS_PC_STS_DATA),\r | |
97 | 0,\r | |
98 | TIS_TIMEOUT_B\r | |
99 | );\r | |
100 | if (EFI_ERROR (Status)) {\r | |
101 | DEBUG ((DEBUG_ERROR, "Wait for Tpm response data time out!!\n"));\r | |
102 | Status = EFI_TIMEOUT;\r | |
103 | goto Exit;\r | |
104 | }\r | |
105 | //\r | |
106 | // Get response data header\r | |
107 | //\r | |
108 | Index = 0;\r | |
109 | BurstCount = 0;\r | |
110 | while (Index < sizeof (TPM_RSP_COMMAND_HDR)) {\r | |
111 | Status = TisPcReadBurstCount (TisReg, &BurstCount);\r | |
112 | if (EFI_ERROR (Status)) {\r | |
113 | Status = EFI_TIMEOUT;\r | |
114 | goto Exit;\r | |
115 | }\r | |
116 | for (; BurstCount > 0; BurstCount--) {\r | |
117 | *(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);\r | |
118 | Index++;\r | |
119 | if (Index == sizeof (TPM_RSP_COMMAND_HDR)) break;\r | |
120 | }\r | |
121 | }\r | |
122 | //\r | |
123 | // Check the reponse data header (tag,parasize and returncode )\r | |
124 | //\r | |
125 | CopyMem (&Data16, BufferOut, sizeof (UINT16));\r | |
126 | if (SwapBytes16 (Data16) != TPM_TAG_RSP_COMMAND ) {\r | |
127 | Status = EFI_DEVICE_ERROR;\r | |
128 | goto Exit;\r | |
129 | }\r | |
130 | \r | |
131 | CopyMem (&Data32, (BufferOut + 2), sizeof (UINT32));\r | |
132 | TpmOutSize = SwapBytes32 (Data32);\r | |
133 | if (*SizeOut < TpmOutSize) {\r | |
134 | Status = EFI_BUFFER_TOO_SMALL;\r | |
135 | goto Exit;\r | |
136 | }\r | |
137 | *SizeOut = TpmOutSize;\r | |
138 | //\r | |
139 | // Continue reading the remaining data\r | |
140 | //\r | |
141 | while ( Index < TpmOutSize ) {\r | |
142 | for (; BurstCount > 0; BurstCount--) {\r | |
143 | *(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);\r | |
144 | Index++;\r | |
145 | if (Index == TpmOutSize) {\r | |
146 | Status = EFI_SUCCESS;\r | |
147 | goto Exit;\r | |
148 | }\r | |
149 | }\r | |
150 | Status = TisPcReadBurstCount (TisReg, &BurstCount);\r | |
151 | if (EFI_ERROR (Status)) {\r | |
152 | Status = EFI_TIMEOUT;\r | |
153 | goto Exit;\r | |
154 | }\r | |
155 | }\r | |
156 | Exit:\r | |
157 | MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_READY);\r | |
158 | return Status;\r | |
159 | }\r | |
160 | \r |