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1 | /** @file\r | |
2 | It updates TPM items in ACPI table and registers SMI callback\r | |
3 | functions for physical presence and ClearMemory.\r | |
4 | \r | |
5 | Caution: This module requires additional review when modified.\r | |
6 | This driver will have external input - variable and ACPINvs data in SMM mode.\r | |
7 | This external input must be validated carefully to avoid security issue.\r | |
8 | \r | |
9 | PhysicalPresenceCallback() and MemoryClearCallback() will receive untrusted input and do some check.\r | |
10 | \r | |
11 | Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
12 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include "TcgSmm.h"\r | |
17 | \r | |
18 | EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable;\r | |
19 | TCG_NVS *mTcgNvs;\r | |
20 | \r | |
21 | /**\r | |
22 | Software SMI callback for TPM physical presence which is called from ACPI method.\r | |
23 | \r | |
24 | Caution: This function may receive untrusted input.\r | |
25 | Variable and ACPINvs are external input, so this function will validate\r | |
26 | its data structure to be valid value.\r | |
27 | \r | |
28 | @param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().\r | |
29 | @param[in] Context Points to an optional handler context which was specified when the\r | |
30 | handler was registered.\r | |
31 | @param[in, out] CommBuffer A pointer to a collection of data in memory that will\r | |
32 | be conveyed from a non-SMM environment into an SMM environment.\r | |
33 | @param[in, out] CommBufferSize The size of the CommBuffer.\r | |
34 | \r | |
35 | @retval EFI_SUCCESS The interrupt was handled successfully.\r | |
36 | \r | |
37 | **/\r | |
38 | EFI_STATUS\r | |
39 | EFIAPI\r | |
40 | PhysicalPresenceCallback (\r | |
41 | IN EFI_HANDLE DispatchHandle,\r | |
42 | IN CONST VOID *Context,\r | |
43 | IN OUT VOID *CommBuffer,\r | |
44 | IN OUT UINTN *CommBufferSize\r | |
45 | )\r | |
46 | {\r | |
47 | EFI_STATUS Status;\r | |
48 | UINTN DataSize;\r | |
49 | EFI_PHYSICAL_PRESENCE PpData;\r | |
50 | EFI_PHYSICAL_PRESENCE_FLAGS Flags;\r | |
51 | BOOLEAN RequestConfirmed;\r | |
52 | \r | |
53 | //\r | |
54 | // Get the Physical Presence variable\r | |
55 | //\r | |
56 | DataSize = sizeof (EFI_PHYSICAL_PRESENCE);\r | |
57 | Status = mSmmVariable->SmmGetVariable (\r | |
58 | PHYSICAL_PRESENCE_VARIABLE,\r | |
59 | &gEfiPhysicalPresenceGuid,\r | |
60 | NULL,\r | |
61 | &DataSize,\r | |
62 | &PpData\r | |
63 | );\r | |
64 | \r | |
65 | DEBUG ((DEBUG_INFO, "[TPM] PP callback, Parameter = %x\n", mTcgNvs->PhysicalPresence.Parameter));\r | |
66 | if (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_RETURN_REQUEST_RESPONSE_TO_OS) {\r | |
67 | if (EFI_ERROR (Status)) {\r | |
68 | mTcgNvs->PhysicalPresence.ReturnCode = PP_RETURN_TPM_OPERATION_RESPONSE_FAILURE;\r | |
69 | mTcgNvs->PhysicalPresence.LastRequest = 0;\r | |
70 | mTcgNvs->PhysicalPresence.Response = 0;\r | |
71 | DEBUG ((DEBUG_ERROR, "[TPM] Get PP variable failure! Status = %r\n", Status));\r | |
72 | return EFI_SUCCESS;\r | |
73 | }\r | |
74 | \r | |
75 | mTcgNvs->PhysicalPresence.ReturnCode = PP_RETURN_TPM_OPERATION_RESPONSE_SUCCESS;\r | |
76 | mTcgNvs->PhysicalPresence.LastRequest = PpData.LastPPRequest;\r | |
77 | mTcgNvs->PhysicalPresence.Response = PpData.PPResponse;\r | |
78 | } else if ( (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_SUBMIT_REQUEST_TO_BIOS)\r | |
79 | || (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_SUBMIT_REQUEST_TO_BIOS_2))\r | |
80 | {\r | |
81 | if (EFI_ERROR (Status)) {\r | |
82 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE;\r | |
83 | DEBUG ((DEBUG_ERROR, "[TPM] Get PP variable failure! Status = %r\n", Status));\r | |
84 | return EFI_SUCCESS;\r | |
85 | }\r | |
86 | \r | |
87 | if (mTcgNvs->PhysicalPresence.Request == PHYSICAL_PRESENCE_SET_OPERATOR_AUTH) {\r | |
88 | //\r | |
89 | // This command requires UI to prompt user for Auth data.\r | |
90 | //\r | |
91 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_SUBMIT_REQUEST_TO_PREOS_NOT_IMPLEMENTED;\r | |
92 | return EFI_SUCCESS;\r | |
93 | }\r | |
94 | \r | |
95 | if (PpData.PPRequest != mTcgNvs->PhysicalPresence.Request) {\r | |
96 | PpData.PPRequest = (UINT8)mTcgNvs->PhysicalPresence.Request;\r | |
97 | DataSize = sizeof (EFI_PHYSICAL_PRESENCE);\r | |
98 | Status = mSmmVariable->SmmSetVariable (\r | |
99 | PHYSICAL_PRESENCE_VARIABLE,\r | |
100 | &gEfiPhysicalPresenceGuid,\r | |
101 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
102 | DataSize,\r | |
103 | &PpData\r | |
104 | );\r | |
105 | }\r | |
106 | \r | |
107 | if (EFI_ERROR (Status)) {\r | |
108 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE;\r | |
109 | return EFI_SUCCESS;\r | |
110 | }\r | |
111 | \r | |
112 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_SUBMIT_REQUEST_TO_PREOS_SUCCESS;\r | |
113 | \r | |
114 | if (mTcgNvs->PhysicalPresence.Request >= TCG_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {\r | |
115 | DataSize = sizeof (EFI_PHYSICAL_PRESENCE_FLAGS);\r | |
116 | Status = mSmmVariable->SmmGetVariable (\r | |
117 | PHYSICAL_PRESENCE_FLAGS_VARIABLE,\r | |
118 | &gEfiPhysicalPresenceGuid,\r | |
119 | NULL,\r | |
120 | &DataSize,\r | |
121 | &Flags\r | |
122 | );\r | |
123 | if (EFI_ERROR (Status)) {\r | |
124 | Flags.PPFlags = TCG_BIOS_TPM_MANAGEMENT_FLAG_NO_PPI_PROVISION;\r | |
125 | }\r | |
126 | \r | |
127 | mTcgNvs->PhysicalPresence.ReturnCode = TcgPpVendorLibSubmitRequestToPreOSFunction (mTcgNvs->PhysicalPresence.Request, Flags.PPFlags);\r | |
128 | }\r | |
129 | } else if (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_GET_USER_CONFIRMATION_STATUS_FOR_REQUEST) {\r | |
130 | if (EFI_ERROR (Status)) {\r | |
131 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_GET_USER_CONFIRMATION_BLOCKED_BY_BIOS_CONFIGURATION;\r | |
132 | DEBUG ((DEBUG_ERROR, "[TPM] Get PP variable failure! Status = %r\n", Status));\r | |
133 | return EFI_SUCCESS;\r | |
134 | }\r | |
135 | \r | |
136 | //\r | |
137 | // Get the Physical Presence flags\r | |
138 | //\r | |
139 | DataSize = sizeof (EFI_PHYSICAL_PRESENCE_FLAGS);\r | |
140 | Status = mSmmVariable->SmmGetVariable (\r | |
141 | PHYSICAL_PRESENCE_FLAGS_VARIABLE,\r | |
142 | &gEfiPhysicalPresenceGuid,\r | |
143 | NULL,\r | |
144 | &DataSize,\r | |
145 | &Flags\r | |
146 | );\r | |
147 | if (EFI_ERROR (Status)) {\r | |
148 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_GET_USER_CONFIRMATION_BLOCKED_BY_BIOS_CONFIGURATION;\r | |
149 | DEBUG ((DEBUG_ERROR, "[TPM] Get PP flags failure! Status = %r\n", Status));\r | |
150 | return EFI_SUCCESS;\r | |
151 | }\r | |
152 | \r | |
153 | RequestConfirmed = FALSE;\r | |
154 | \r | |
155 | switch (mTcgNvs->PPRequestUserConfirm) {\r | |
156 | case PHYSICAL_PRESENCE_ENABLE:\r | |
157 | case PHYSICAL_PRESENCE_DISABLE:\r | |
158 | case PHYSICAL_PRESENCE_ACTIVATE:\r | |
159 | case PHYSICAL_PRESENCE_DEACTIVATE:\r | |
160 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE:\r | |
161 | case PHYSICAL_PRESENCE_DEACTIVATE_DISABLE:\r | |
162 | case PHYSICAL_PRESENCE_SET_OWNER_INSTALL_TRUE:\r | |
163 | case PHYSICAL_PRESENCE_SET_OWNER_INSTALL_FALSE:\r | |
164 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_OWNER_TRUE:\r | |
165 | case PHYSICAL_PRESENCE_DEACTIVATE_DISABLE_OWNER_FALSE:\r | |
166 | if ((Flags.PPFlags & TCG_BIOS_TPM_MANAGEMENT_FLAG_NO_PPI_PROVISION) != 0) {\r | |
167 | RequestConfirmed = TRUE;\r | |
168 | }\r | |
169 | \r | |
170 | break;\r | |
171 | \r | |
172 | case PHYSICAL_PRESENCE_CLEAR:\r | |
173 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_CLEAR:\r | |
174 | if ((Flags.PPFlags & TCG_BIOS_TPM_MANAGEMENT_FLAG_NO_PPI_CLEAR) != 0) {\r | |
175 | RequestConfirmed = TRUE;\r | |
176 | }\r | |
177 | \r | |
178 | break;\r | |
179 | \r | |
180 | case PHYSICAL_PRESENCE_DEFERRED_PP_UNOWNERED_FIELD_UPGRADE:\r | |
181 | if ((Flags.PPFlags & TCG_BIOS_TPM_MANAGEMENT_FLAG_NO_PPI_MAINTENANCE) != 0) {\r | |
182 | RequestConfirmed = TRUE;\r | |
183 | }\r | |
184 | \r | |
185 | break;\r | |
186 | \r | |
187 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_CLEAR_ENABLE_ACTIVATE:\r | |
188 | case PHYSICAL_PRESENCE_CLEAR_ENABLE_ACTIVATE:\r | |
189 | if (((Flags.PPFlags & TCG_BIOS_TPM_MANAGEMENT_FLAG_NO_PPI_CLEAR) != 0) && ((Flags.PPFlags & TCG_BIOS_TPM_MANAGEMENT_FLAG_NO_PPI_PROVISION) != 0)) {\r | |
190 | RequestConfirmed = TRUE;\r | |
191 | }\r | |
192 | \r | |
193 | break;\r | |
194 | \r | |
195 | case PHYSICAL_PRESENCE_SET_NO_PPI_PROVISION_FALSE:\r | |
196 | case PHYSICAL_PRESENCE_SET_NO_PPI_CLEAR_FALSE:\r | |
197 | case PHYSICAL_PRESENCE_SET_NO_PPI_MAINTENANCE_FALSE:\r | |
198 | case PHYSICAL_PRESENCE_NO_ACTION:\r | |
199 | RequestConfirmed = TRUE;\r | |
200 | break;\r | |
201 | \r | |
202 | case PHYSICAL_PRESENCE_SET_OPERATOR_AUTH:\r | |
203 | //\r | |
204 | // This command requires UI to prompt user for Auth data\r | |
205 | //\r | |
206 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_GET_USER_CONFIRMATION_NOT_IMPLEMENTED;\r | |
207 | return EFI_SUCCESS;\r | |
208 | default:\r | |
209 | break;\r | |
210 | }\r | |
211 | \r | |
212 | if (RequestConfirmed) {\r | |
213 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_GET_USER_CONFIRMATION_ALLOWED_AND_PPUSER_NOT_REQUIRED;\r | |
214 | } else {\r | |
215 | mTcgNvs->PhysicalPresence.ReturnCode = TCG_PP_GET_USER_CONFIRMATION_ALLOWED_AND_PPUSER_REQUIRED;\r | |
216 | }\r | |
217 | \r | |
218 | if (mTcgNvs->PhysicalPresence.Request >= TCG_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {\r | |
219 | mTcgNvs->PhysicalPresence.ReturnCode = TcgPpVendorLibGetUserConfirmationStatusFunction (mTcgNvs->PhysicalPresence.Request, Flags.PPFlags);\r | |
220 | }\r | |
221 | }\r | |
222 | \r | |
223 | return EFI_SUCCESS;\r | |
224 | }\r | |
225 | \r | |
226 | /**\r | |
227 | Software SMI callback for MemoryClear which is called from ACPI method.\r | |
228 | \r | |
229 | Caution: This function may receive untrusted input.\r | |
230 | Variable and ACPINvs are external input, so this function will validate\r | |
231 | its data structure to be valid value.\r | |
232 | \r | |
233 | @param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().\r | |
234 | @param[in] Context Points to an optional handler context which was specified when the\r | |
235 | handler was registered.\r | |
236 | @param[in, out] CommBuffer A pointer to a collection of data in memory that will\r | |
237 | be conveyed from a non-SMM environment into an SMM environment.\r | |
238 | @param[in, out] CommBufferSize The size of the CommBuffer.\r | |
239 | \r | |
240 | @retval EFI_SUCCESS The interrupt was handled successfully.\r | |
241 | \r | |
242 | **/\r | |
243 | EFI_STATUS\r | |
244 | EFIAPI\r | |
245 | MemoryClearCallback (\r | |
246 | IN EFI_HANDLE DispatchHandle,\r | |
247 | IN CONST VOID *Context,\r | |
248 | IN OUT VOID *CommBuffer,\r | |
249 | IN OUT UINTN *CommBufferSize\r | |
250 | )\r | |
251 | {\r | |
252 | EFI_STATUS Status;\r | |
253 | UINTN DataSize;\r | |
254 | UINT8 MorControl;\r | |
255 | \r | |
256 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_SUCCESS;\r | |
257 | if (mTcgNvs->MemoryClear.Parameter == ACPI_FUNCTION_DSM_MEMORY_CLEAR_INTERFACE) {\r | |
258 | MorControl = (UINT8)mTcgNvs->MemoryClear.Request;\r | |
259 | } else if (mTcgNvs->MemoryClear.Parameter == ACPI_FUNCTION_PTS_CLEAR_MOR_BIT) {\r | |
260 | DataSize = sizeof (UINT8);\r | |
261 | Status = mSmmVariable->SmmGetVariable (\r | |
262 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,\r | |
263 | &gEfiMemoryOverwriteControlDataGuid,\r | |
264 | NULL,\r | |
265 | &DataSize,\r | |
266 | &MorControl\r | |
267 | );\r | |
268 | if (EFI_ERROR (Status)) {\r | |
269 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;\r | |
270 | DEBUG ((DEBUG_ERROR, "[TPM] Get MOR variable failure! Status = %r\n", Status));\r | |
271 | return EFI_SUCCESS;\r | |
272 | }\r | |
273 | \r | |
274 | if (MOR_CLEAR_MEMORY_VALUE (MorControl) == 0x0) {\r | |
275 | return EFI_SUCCESS;\r | |
276 | }\r | |
277 | \r | |
278 | MorControl &= ~MOR_CLEAR_MEMORY_BIT_MASK;\r | |
279 | } else {\r | |
280 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;\r | |
281 | DEBUG ((DEBUG_ERROR, "[TPM] MOR Parameter error! Parameter = %x\n", mTcgNvs->MemoryClear.Parameter));\r | |
282 | return EFI_SUCCESS;\r | |
283 | }\r | |
284 | \r | |
285 | DataSize = sizeof (UINT8);\r | |
286 | Status = mSmmVariable->SmmSetVariable (\r | |
287 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,\r | |
288 | &gEfiMemoryOverwriteControlDataGuid,\r | |
289 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
290 | DataSize,\r | |
291 | &MorControl\r | |
292 | );\r | |
293 | if (EFI_ERROR (Status)) {\r | |
294 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;\r | |
295 | DEBUG ((DEBUG_ERROR, "[TPM] Set MOR variable failure! Status = %r\n", Status));\r | |
296 | }\r | |
297 | \r | |
298 | return EFI_SUCCESS;\r | |
299 | }\r | |
300 | \r | |
301 | /**\r | |
302 | Find the operation region in TCG ACPI table by given Name and Size,\r | |
303 | and initialize it if the region is found.\r | |
304 | \r | |
305 | @param[in, out] Table The TPM item in ACPI table.\r | |
306 | @param[in] Name The name string to find in TPM table.\r | |
307 | @param[in] Size The size of the region to find.\r | |
308 | \r | |
309 | @return The allocated address for the found region.\r | |
310 | \r | |
311 | **/\r | |
312 | VOID *\r | |
313 | AssignOpRegion (\r | |
314 | EFI_ACPI_DESCRIPTION_HEADER *Table,\r | |
315 | UINT32 Name,\r | |
316 | UINT16 Size\r | |
317 | )\r | |
318 | {\r | |
319 | EFI_STATUS Status;\r | |
320 | AML_OP_REGION_32_8 *OpRegion;\r | |
321 | EFI_PHYSICAL_ADDRESS MemoryAddress;\r | |
322 | \r | |
323 | MemoryAddress = SIZE_4GB - 1;\r | |
324 | \r | |
325 | //\r | |
326 | // Patch some pointers for the ASL code before loading the SSDT.\r | |
327 | //\r | |
328 | for (OpRegion = (AML_OP_REGION_32_8 *)(Table + 1);\r | |
329 | OpRegion <= (AML_OP_REGION_32_8 *)((UINT8 *)Table + Table->Length);\r | |
330 | OpRegion = (AML_OP_REGION_32_8 *)((UINT8 *)OpRegion + 1))\r | |
331 | {\r | |
332 | if ((OpRegion->OpRegionOp == AML_EXT_REGION_OP) &&\r | |
333 | (OpRegion->NameString == Name) &&\r | |
334 | (OpRegion->DWordPrefix == AML_DWORD_PREFIX) &&\r | |
335 | (OpRegion->BytePrefix == AML_BYTE_PREFIX))\r | |
336 | {\r | |
337 | Status = gBS->AllocatePages (AllocateMaxAddress, EfiACPIMemoryNVS, EFI_SIZE_TO_PAGES (Size), &MemoryAddress);\r | |
338 | ASSERT_EFI_ERROR (Status);\r | |
339 | ZeroMem ((VOID *)(UINTN)MemoryAddress, Size);\r | |
340 | OpRegion->RegionOffset = (UINT32)(UINTN)MemoryAddress;\r | |
341 | OpRegion->RegionLen = (UINT8)Size;\r | |
342 | break;\r | |
343 | }\r | |
344 | }\r | |
345 | \r | |
346 | return (VOID *)(UINTN)MemoryAddress;\r | |
347 | }\r | |
348 | \r | |
349 | /**\r | |
350 | Initialize and publish TPM items in ACPI table.\r | |
351 | \r | |
352 | @retval EFI_SUCCESS The TCG ACPI table is published successfully.\r | |
353 | @retval Others The TCG ACPI table is not published.\r | |
354 | \r | |
355 | **/\r | |
356 | EFI_STATUS\r | |
357 | PublishAcpiTable (\r | |
358 | VOID\r | |
359 | )\r | |
360 | {\r | |
361 | EFI_STATUS Status;\r | |
362 | EFI_ACPI_TABLE_PROTOCOL *AcpiTable;\r | |
363 | UINTN TableKey;\r | |
364 | EFI_ACPI_DESCRIPTION_HEADER *Table;\r | |
365 | UINTN TableSize;\r | |
366 | \r | |
367 | Status = GetSectionFromFv (\r | |
368 | &gEfiCallerIdGuid,\r | |
369 | EFI_SECTION_RAW,\r | |
370 | 0,\r | |
371 | (VOID **)&Table,\r | |
372 | &TableSize\r | |
373 | );\r | |
374 | ASSERT_EFI_ERROR (Status);\r | |
375 | \r | |
376 | //\r | |
377 | // Measure to PCR[0] with event EV_POST_CODE ACPI DATA\r | |
378 | //\r | |
379 | TpmMeasureAndLogData (\r | |
380 | 0,\r | |
381 | EV_POST_CODE,\r | |
382 | EV_POSTCODE_INFO_ACPI_DATA,\r | |
383 | ACPI_DATA_LEN,\r | |
384 | Table,\r | |
385 | TableSize\r | |
386 | );\r | |
387 | \r | |
388 | ASSERT (Table->OemTableId == SIGNATURE_64 ('T', 'c', 'g', 'T', 'a', 'b', 'l', 'e'));\r | |
389 | CopyMem (Table->OemId, PcdGetPtr (PcdAcpiDefaultOemId), sizeof (Table->OemId));\r | |
390 | mTcgNvs = AssignOpRegion (Table, SIGNATURE_32 ('T', 'N', 'V', 'S'), (UINT16)sizeof (TCG_NVS));\r | |
391 | ASSERT (mTcgNvs != NULL);\r | |
392 | \r | |
393 | //\r | |
394 | // Publish the TPM ACPI table\r | |
395 | //\r | |
396 | Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **)&AcpiTable);\r | |
397 | ASSERT_EFI_ERROR (Status);\r | |
398 | \r | |
399 | TableKey = 0;\r | |
400 | Status = AcpiTable->InstallAcpiTable (\r | |
401 | AcpiTable,\r | |
402 | Table,\r | |
403 | TableSize,\r | |
404 | &TableKey\r | |
405 | );\r | |
406 | ASSERT_EFI_ERROR (Status);\r | |
407 | \r | |
408 | return Status;\r | |
409 | }\r | |
410 | \r | |
411 | /**\r | |
412 | The driver's entry point.\r | |
413 | \r | |
414 | It install callbacks for TPM physical presence and MemoryClear, and locate\r | |
415 | SMM variable to be used in the callback function.\r | |
416 | \r | |
417 | @param[in] ImageHandle The firmware allocated handle for the EFI image.\r | |
418 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
419 | \r | |
420 | @retval EFI_SUCCESS The entry point is executed successfully.\r | |
421 | @retval Others Some error occurs when executing this entry point.\r | |
422 | \r | |
423 | **/\r | |
424 | EFI_STATUS\r | |
425 | EFIAPI\r | |
426 | InitializeTcgSmm (\r | |
427 | IN EFI_HANDLE ImageHandle,\r | |
428 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
429 | )\r | |
430 | {\r | |
431 | EFI_STATUS Status;\r | |
432 | EFI_SMM_SW_DISPATCH2_PROTOCOL *SwDispatch;\r | |
433 | EFI_SMM_SW_REGISTER_CONTEXT SwContext;\r | |
434 | EFI_HANDLE SwHandle;\r | |
435 | \r | |
436 | if (!CompareGuid (PcdGetPtr (PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceTpm12Guid)) {\r | |
437 | DEBUG ((DEBUG_ERROR, "No TPM12 instance required!\n"));\r | |
438 | return EFI_UNSUPPORTED;\r | |
439 | }\r | |
440 | \r | |
441 | Status = PublishAcpiTable ();\r | |
442 | ASSERT_EFI_ERROR (Status);\r | |
443 | \r | |
444 | //\r | |
445 | // Get the Sw dispatch protocol and register SMI callback functions.\r | |
446 | //\r | |
447 | Status = gSmst->SmmLocateProtocol (&gEfiSmmSwDispatch2ProtocolGuid, NULL, (VOID **)&SwDispatch);\r | |
448 | ASSERT_EFI_ERROR (Status);\r | |
449 | SwContext.SwSmiInputValue = (UINTN)-1;\r | |
450 | Status = SwDispatch->Register (SwDispatch, PhysicalPresenceCallback, &SwContext, &SwHandle);\r | |
451 | ASSERT_EFI_ERROR (Status);\r | |
452 | if (EFI_ERROR (Status)) {\r | |
453 | return Status;\r | |
454 | }\r | |
455 | \r | |
456 | mTcgNvs->PhysicalPresence.SoftwareSmi = (UINT8)SwContext.SwSmiInputValue;\r | |
457 | \r | |
458 | SwContext.SwSmiInputValue = (UINTN)-1;\r | |
459 | Status = SwDispatch->Register (SwDispatch, MemoryClearCallback, &SwContext, &SwHandle);\r | |
460 | ASSERT_EFI_ERROR (Status);\r | |
461 | if (EFI_ERROR (Status)) {\r | |
462 | return Status;\r | |
463 | }\r | |
464 | \r | |
465 | mTcgNvs->MemoryClear.SoftwareSmi = (UINT8)SwContext.SwSmiInputValue;\r | |
466 | \r | |
467 | //\r | |
468 | // Locate SmmVariableProtocol.\r | |
469 | //\r | |
470 | Status = gSmst->SmmLocateProtocol (&gEfiSmmVariableProtocolGuid, NULL, (VOID **)&mSmmVariable);\r | |
471 | ASSERT_EFI_ERROR (Status);\r | |
472 | \r | |
473 | return EFI_SUCCESS;\r | |
474 | }\r |