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0c18794e | 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 | |
dc204d5a JY |
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 | |
8a8c6c96 | 11 | Copyright (c) 2011 - 2014, Intel Corporation. All rights reserved.<BR>\r |
0c18794e | 12 | This program and the accompanying materials \r |
13 | are licensed and made available under the terms and conditions of the BSD License \r | |
14 | which accompanies this distribution. The full text of the license may be found at \r | |
15 | http://opensource.org/licenses/bsd-license.php\r | |
16 | \r | |
17 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
18 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
19 | \r | |
20 | **/\r | |
21 | \r | |
82a1e09c | 22 | #include "TcgSmm.h"\r |
0c18794e | 23 | \r |
24 | EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable;\r | |
25 | TCG_NVS *mTcgNvs;\r | |
26 | \r | |
27 | /**\r | |
28 | Software SMI callback for TPM physical presence which is called from ACPI method.\r | |
29 | \r | |
dc204d5a JY |
30 | Caution: This function may receive untrusted input.\r |
31 | Variable and ACPINvs are external input, so this function will validate\r | |
32 | its data structure to be valid value.\r | |
33 | \r | |
0c18794e | 34 | @param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().\r |
35 | @param[in] Context Points to an optional handler context which was specified when the\r | |
36 | handler was registered.\r | |
37 | @param[in, out] CommBuffer A pointer to a collection of data in memory that will\r | |
38 | be conveyed from a non-SMM environment into an SMM environment.\r | |
39 | @param[in, out] CommBufferSize The size of the CommBuffer.\r | |
40 | \r | |
41 | @retval EFI_SUCCESS The interrupt was handled successfully.\r | |
42 | \r | |
43 | **/\r | |
44 | EFI_STATUS\r | |
45 | EFIAPI\r | |
46 | PhysicalPresenceCallback (\r | |
47 | IN EFI_HANDLE DispatchHandle,\r | |
48 | IN CONST VOID *Context,\r | |
49 | IN OUT VOID *CommBuffer,\r | |
50 | IN OUT UINTN *CommBufferSize\r | |
51 | )\r | |
52 | {\r | |
53 | EFI_STATUS Status;\r | |
54 | UINTN DataSize;\r | |
55 | EFI_PHYSICAL_PRESENCE PpData;\r | |
56 | UINT8 Flags;\r | |
57 | BOOLEAN RequestConfirmed;\r | |
58 | \r | |
59 | //\r | |
60 | // Get the Physical Presence variable\r | |
61 | //\r | |
62 | DataSize = sizeof (EFI_PHYSICAL_PRESENCE);\r | |
63 | Status = mSmmVariable->SmmGetVariable (\r | |
64 | PHYSICAL_PRESENCE_VARIABLE,\r | |
65 | &gEfiPhysicalPresenceGuid,\r | |
66 | NULL,\r | |
67 | &DataSize,\r | |
68 | &PpData\r | |
69 | );\r | |
70 | if (EFI_ERROR (Status)) {\r | |
8a8c6c96 DG |
71 | mTcgNvs->PhysicalPresence.ReturnCode = PP_SUBMIT_REQUEST_GENERAL_FAILURE;\r |
72 | DEBUG ((EFI_D_ERROR, "[TPM] Get PP variable failure! Status = %r\n", Status));\r | |
0c18794e | 73 | return EFI_SUCCESS;\r |
74 | }\r | |
75 | \r | |
76 | DEBUG ((EFI_D_INFO, "[TPM] PP callback, Parameter = %x\n", mTcgNvs->PhysicalPresence.Parameter));\r | |
82a1e09c | 77 | if (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_RETURN_REQUEST_RESPONSE_TO_OS) {\r |
0c18794e | 78 | mTcgNvs->PhysicalPresence.LastRequest = PpData.LastPPRequest;\r |
79 | mTcgNvs->PhysicalPresence.Response = PpData.PPResponse;\r | |
82a1e09c | 80 | } else if ((mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_SUBMIT_REQUEST_TO_BIOS) \r |
81 | || (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_SUBMIT_REQUEST_TO_BIOS_2)) {\r | |
607599bf | 82 | if (mTcgNvs->PhysicalPresence.Request == PHYSICAL_PRESENCE_SET_OPERATOR_AUTH) {\r |
0c18794e | 83 | //\r |
82a1e09c | 84 | // This command requires UI to prompt user for Auth data.\r |
0c18794e | 85 | //\r |
82a1e09c | 86 | mTcgNvs->PhysicalPresence.ReturnCode = PP_SUBMIT_REQUEST_NOT_IMPLEMENTED;\r |
0c18794e | 87 | return EFI_SUCCESS;\r |
88 | }\r | |
89 | \r | |
90 | if (PpData.PPRequest != mTcgNvs->PhysicalPresence.Request) {\r | |
91 | PpData.PPRequest = (UINT8) mTcgNvs->PhysicalPresence.Request;\r | |
92 | DataSize = sizeof (EFI_PHYSICAL_PRESENCE);\r | |
93 | Status = mSmmVariable->SmmSetVariable (\r | |
94 | PHYSICAL_PRESENCE_VARIABLE,\r | |
95 | &gEfiPhysicalPresenceGuid,\r | |
96 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
97 | DataSize,\r | |
98 | &PpData\r | |
99 | );\r | |
100 | }\r | |
101 | \r | |
102 | if (EFI_ERROR (Status)) { \r | |
82a1e09c | 103 | mTcgNvs->PhysicalPresence.ReturnCode = PP_SUBMIT_REQUEST_GENERAL_FAILURE;\r |
0c18794e | 104 | return EFI_SUCCESS;\r |
105 | }\r | |
82a1e09c | 106 | mTcgNvs->PhysicalPresence.ReturnCode = PP_SUBMIT_REQUEST_SUCCESS;\r |
107 | } else if (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_GET_USER_CONFIRMATION_STATUS_FOR_REQUEST) {\r | |
ed094569 DG |
108 | //\r |
109 | // Get the Physical Presence flags\r | |
110 | //\r | |
111 | DataSize = sizeof (UINT8);\r | |
112 | Status = mSmmVariable->SmmGetVariable (\r | |
113 | PHYSICAL_PRESENCE_FLAGS_VARIABLE,\r | |
114 | &gEfiPhysicalPresenceGuid,\r | |
115 | NULL,\r | |
116 | &DataSize,\r | |
117 | &Flags\r | |
118 | );\r | |
119 | if (EFI_ERROR (Status)) {\r | |
120 | mTcgNvs->PhysicalPresence.ReturnCode = PP_SUBMIT_REQUEST_GENERAL_FAILURE;\r | |
8a8c6c96 | 121 | DEBUG ((EFI_D_ERROR, "[TPM] Get PP flags failure! Status = %r\n", Status));\r |
ed094569 DG |
122 | return EFI_SUCCESS;\r |
123 | }\r | |
124 | \r | |
0c18794e | 125 | RequestConfirmed = FALSE;\r |
126 | \r | |
127 | switch (mTcgNvs->PhysicalPresence.Request) {\r | |
607599bf | 128 | case PHYSICAL_PRESENCE_ENABLE:\r |
129 | case PHYSICAL_PRESENCE_DISABLE:\r | |
130 | case PHYSICAL_PRESENCE_ACTIVATE:\r | |
131 | case PHYSICAL_PRESENCE_DEACTIVATE:\r | |
132 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE:\r | |
133 | case PHYSICAL_PRESENCE_DEACTIVATE_DISABLE:\r | |
134 | case PHYSICAL_PRESENCE_SET_OWNER_INSTALL_TRUE:\r | |
135 | case PHYSICAL_PRESENCE_SET_OWNER_INSTALL_FALSE:\r | |
136 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_OWNER_TRUE:\r | |
137 | case PHYSICAL_PRESENCE_DEACTIVATE_DISABLE_OWNER_FALSE:\r | |
0c18794e | 138 | if ((Flags & FLAG_NO_PPI_PROVISION) != 0) {\r |
139 | RequestConfirmed = TRUE;\r | |
140 | }\r | |
141 | break;\r | |
142 | \r | |
607599bf | 143 | case PHYSICAL_PRESENCE_CLEAR:\r |
144 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_CLEAR:\r | |
0c18794e | 145 | if ((Flags & FLAG_NO_PPI_CLEAR) != 0) {\r |
146 | RequestConfirmed = TRUE;\r | |
147 | }\r | |
148 | break;\r | |
149 | \r | |
607599bf | 150 | case PHYSICAL_PRESENCE_DEFERRED_PP_UNOWNERED_FIELD_UPGRADE:\r |
0c18794e | 151 | if ((Flags & FLAG_NO_PPI_MAINTENANCE) != 0) {\r |
152 | RequestConfirmed = TRUE;\r | |
153 | }\r | |
154 | break;\r | |
155 | \r | |
607599bf | 156 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_CLEAR_ENABLE_ACTIVATE:\r |
157 | case PHYSICAL_PRESENCE_CLEAR_ENABLE_ACTIVATE:\r | |
0c18794e | 158 | if ((Flags & FLAG_NO_PPI_CLEAR) != 0 && (Flags & FLAG_NO_PPI_PROVISION) != 0) {\r |
159 | RequestConfirmed = TRUE;\r | |
160 | }\r | |
161 | break; \r | |
162 | \r | |
607599bf | 163 | case PHYSICAL_PRESENCE_SET_NO_PPI_PROVISION_FALSE:\r |
164 | case PHYSICAL_PRESENCE_SET_NO_PPI_CLEAR_FALSE:\r | |
165 | case PHYSICAL_PRESENCE_SET_NO_PPI_MAINTENANCE_FALSE:\r | |
166 | case PHYSICAL_PRESENCE_NO_ACTION:\r | |
0c18794e | 167 | RequestConfirmed = TRUE;\r |
168 | break;\r | |
169 | \r | |
607599bf | 170 | case PHYSICAL_PRESENCE_SET_OPERATOR_AUTH:\r |
0c18794e | 171 | //\r |
172 | // This command requires UI to prompt user for Auth data\r | |
0c18794e | 173 | //\r |
82a1e09c | 174 | mTcgNvs->PhysicalPresence.ReturnCode = PP_REQUEST_NOT_IMPLEMENTED; \r |
0c18794e | 175 | return EFI_SUCCESS;\r |
176 | }\r | |
177 | \r | |
178 | if (RequestConfirmed) {\r | |
82a1e09c | 179 | mTcgNvs->PhysicalPresence.ReturnCode = PP_REQUEST_ALLOWED_AND_PPUSER_NOT_REQUIRED;\r |
0c18794e | 180 | } else {\r |
82a1e09c | 181 | mTcgNvs->PhysicalPresence.ReturnCode = PP_REQUEST_ALLOWED_AND_PPUSER_REQUIRED;\r |
0c18794e | 182 | } \r |
183 | } \r | |
184 | \r | |
185 | return EFI_SUCCESS;\r | |
186 | }\r | |
187 | \r | |
188 | \r | |
189 | /**\r | |
190 | Software SMI callback for MemoryClear which is called from ACPI method.\r | |
191 | \r | |
dc204d5a JY |
192 | Caution: This function may receive untrusted input.\r |
193 | Variable and ACPINvs are external input, so this function will validate\r | |
194 | its data structure to be valid value.\r | |
195 | \r | |
0c18794e | 196 | @param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().\r |
197 | @param[in] Context Points to an optional handler context which was specified when the\r | |
198 | handler was registered.\r | |
199 | @param[in, out] CommBuffer A pointer to a collection of data in memory that will\r | |
200 | be conveyed from a non-SMM environment into an SMM environment.\r | |
201 | @param[in, out] CommBufferSize The size of the CommBuffer.\r | |
202 | \r | |
203 | @retval EFI_SUCCESS The interrupt was handled successfully.\r | |
204 | \r | |
205 | **/\r | |
206 | EFI_STATUS\r | |
207 | EFIAPI\r | |
208 | MemoryClearCallback (\r | |
209 | IN EFI_HANDLE DispatchHandle,\r | |
210 | IN CONST VOID *Context,\r | |
211 | IN OUT VOID *CommBuffer,\r | |
212 | IN OUT UINTN *CommBufferSize\r | |
213 | )\r | |
214 | {\r | |
215 | EFI_STATUS Status;\r | |
216 | UINTN DataSize;\r | |
217 | UINT8 MorControl;\r | |
218 | \r | |
82a1e09c | 219 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_SUCCESS;\r |
220 | if (mTcgNvs->MemoryClear.Parameter == ACPI_FUNCTION_DSM_MEMORY_CLEAR_INTERFACE) {\r | |
0c18794e | 221 | MorControl = (UINT8) mTcgNvs->MemoryClear.Request;\r |
82a1e09c | 222 | } else if (mTcgNvs->MemoryClear.Parameter == ACPI_FUNCTION_PTS_CLEAR_MOR_BIT) {\r |
0c18794e | 223 | DataSize = sizeof (UINT8);\r |
224 | Status = mSmmVariable->SmmGetVariable (\r | |
225 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,\r | |
226 | &gEfiMemoryOverwriteControlDataGuid,\r | |
227 | NULL,\r | |
228 | &DataSize,\r | |
229 | &MorControl\r | |
230 | );\r | |
231 | if (EFI_ERROR (Status)) {\r | |
8a8c6c96 DG |
232 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;\r |
233 | DEBUG ((EFI_D_ERROR, "[TPM] Get MOR variable failure! Status = %r\n", Status));\r | |
0c18794e | 234 | return EFI_SUCCESS;\r |
235 | }\r | |
236 | \r | |
237 | if (MOR_CLEAR_MEMORY_VALUE (MorControl) == 0x0) {\r | |
238 | return EFI_SUCCESS;\r | |
239 | }\r | |
240 | MorControl &= ~MOR_CLEAR_MEMORY_BIT_MASK;\r | |
241 | }\r | |
242 | \r | |
243 | DataSize = sizeof (UINT8);\r | |
244 | Status = mSmmVariable->SmmSetVariable (\r | |
245 | MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,\r | |
246 | &gEfiMemoryOverwriteControlDataGuid,\r | |
247 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
248 | DataSize,\r | |
249 | &MorControl\r | |
250 | );\r | |
82a1e09c | 251 | if (EFI_ERROR (Status)) { \r |
252 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;\r | |
8a8c6c96 | 253 | DEBUG ((EFI_D_ERROR, "[TPM] Set MOR variable failure! Status = %r\n", Status));\r |
82a1e09c | 254 | }\r |
0c18794e | 255 | \r |
256 | return EFI_SUCCESS;\r | |
257 | }\r | |
258 | \r | |
259 | /**\r | |
260 | Find the operation region in TCG ACPI table by given Name and Size,\r | |
261 | and initialize it if the region is found.\r | |
262 | \r | |
263 | @param[in, out] Table The TPM item in ACPI table.\r | |
264 | @param[in] Name The name string to find in TPM table.\r | |
265 | @param[in] Size The size of the region to find.\r | |
266 | \r | |
267 | @return The allocated address for the found region.\r | |
268 | \r | |
269 | **/\r | |
270 | VOID *\r | |
271 | AssignOpRegion (\r | |
272 | EFI_ACPI_DESCRIPTION_HEADER *Table,\r | |
273 | UINT32 Name,\r | |
274 | UINT16 Size\r | |
275 | )\r | |
276 | {\r | |
277 | EFI_STATUS Status;\r | |
278 | AML_OP_REGION_32_8 *OpRegion;\r | |
279 | EFI_PHYSICAL_ADDRESS MemoryAddress;\r | |
280 | \r | |
281 | MemoryAddress = SIZE_4GB - 1;\r | |
282 | \r | |
283 | //\r | |
284 | // Patch some pointers for the ASL code before loading the SSDT.\r | |
285 | //\r | |
286 | for (OpRegion = (AML_OP_REGION_32_8 *) (Table + 1);\r | |
287 | OpRegion <= (AML_OP_REGION_32_8 *) ((UINT8 *) Table + Table->Length);\r | |
288 | OpRegion = (AML_OP_REGION_32_8 *) ((UINT8 *) OpRegion + 1)) {\r | |
209e6e31 | 289 | if ((OpRegion->OpRegionOp == AML_EXT_REGION_OP) && \r |
0c18794e | 290 | (OpRegion->NameString == Name) &&\r |
0c18794e | 291 | (OpRegion->DWordPrefix == AML_DWORD_PREFIX) &&\r |
292 | (OpRegion->BytePrefix == AML_BYTE_PREFIX)) {\r | |
293 | \r | |
294 | Status = gBS->AllocatePages(AllocateMaxAddress, EfiACPIMemoryNVS, EFI_SIZE_TO_PAGES (Size), &MemoryAddress);\r | |
295 | ASSERT_EFI_ERROR (Status);\r | |
296 | ZeroMem ((VOID *)(UINTN)MemoryAddress, Size);\r | |
297 | OpRegion->RegionOffset = (UINT32) (UINTN) MemoryAddress;\r | |
82a1e09c | 298 | OpRegion->RegionLen = (UINT8) Size;\r |
0c18794e | 299 | break;\r |
300 | }\r | |
301 | }\r | |
302 | \r | |
303 | return (VOID *) (UINTN) MemoryAddress;\r | |
304 | }\r | |
305 | \r | |
306 | /**\r | |
307 | Initialize and publish TPM items in ACPI table.\r | |
308 | \r | |
309 | @retval EFI_SUCCESS The TCG ACPI table is published successfully.\r | |
310 | @retval Others The TCG ACPI table is not published.\r | |
311 | \r | |
312 | **/\r | |
313 | EFI_STATUS\r | |
314 | PublishAcpiTable (\r | |
315 | VOID\r | |
316 | )\r | |
317 | {\r | |
318 | EFI_STATUS Status;\r | |
319 | EFI_ACPI_TABLE_PROTOCOL *AcpiTable;\r | |
320 | UINTN TableKey;\r | |
321 | EFI_ACPI_DESCRIPTION_HEADER *Table;\r | |
322 | UINTN TableSize;\r | |
323 | \r | |
324 | Status = GetSectionFromFv (\r | |
325 | &gEfiCallerIdGuid,\r | |
326 | EFI_SECTION_RAW,\r | |
327 | 0,\r | |
328 | (VOID **) &Table,\r | |
329 | &TableSize\r | |
330 | );\r | |
331 | ASSERT_EFI_ERROR (Status);\r | |
332 | \r | |
a332cfd3 | 333 | \r |
334 | //\r | |
335 | // Measure to PCR[0] with event EV_POST_CODE ACPI DATA\r | |
336 | //\r | |
337 | TpmMeasureAndLogData(\r | |
338 | 0,\r | |
339 | EV_POST_CODE,\r | |
340 | EV_POSTCODE_INFO_ACPI_DATA,\r | |
341 | ACPI_DATA_LEN,\r | |
342 | Table,\r | |
343 | TableSize\r | |
344 | );\r | |
345 | \r | |
346 | \r | |
0c18794e | 347 | ASSERT (Table->OemTableId == SIGNATURE_64 ('T', 'c', 'g', 'T', 'a', 'b', 'l', 'e'));\r |
e84f07b5 | 348 | CopyMem (Table->OemId, PcdGetPtr (PcdAcpiDefaultOemId), sizeof (Table->OemId) );\r |
0f7f6d23 | 349 | mTcgNvs = AssignOpRegion (Table, SIGNATURE_32 ('T', 'N', 'V', 'S'), (UINT16) sizeof (TCG_NVS));\r |
0c18794e | 350 | ASSERT (mTcgNvs != NULL);\r |
351 | \r | |
352 | //\r | |
353 | // Publish the TPM ACPI table\r | |
354 | //\r | |
355 | Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **) &AcpiTable);\r | |
356 | ASSERT_EFI_ERROR (Status);\r | |
357 | \r | |
358 | TableKey = 0;\r | |
359 | Status = AcpiTable->InstallAcpiTable (\r | |
360 | AcpiTable,\r | |
361 | Table,\r | |
362 | TableSize,\r | |
363 | &TableKey\r | |
364 | );\r | |
365 | ASSERT_EFI_ERROR (Status);\r | |
366 | \r | |
367 | return Status;\r | |
368 | }\r | |
369 | \r | |
370 | /**\r | |
371 | The driver's entry point.\r | |
372 | \r | |
373 | It install callbacks for TPM physical presence and MemoryClear, and locate \r | |
374 | SMM variable to be used in the callback function.\r | |
375 | \r | |
376 | @param[in] ImageHandle The firmware allocated handle for the EFI image. \r | |
377 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
378 | \r | |
379 | @retval EFI_SUCCESS The entry point is executed successfully.\r | |
380 | @retval Others Some error occurs when executing this entry point.\r | |
381 | \r | |
382 | **/\r | |
383 | EFI_STATUS\r | |
384 | EFIAPI\r | |
385 | InitializeTcgSmm (\r | |
386 | IN EFI_HANDLE ImageHandle,\r | |
387 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
388 | )\r | |
389 | {\r | |
390 | EFI_STATUS Status;\r | |
391 | EFI_SMM_SW_DISPATCH2_PROTOCOL *SwDispatch;\r | |
392 | EFI_SMM_SW_REGISTER_CONTEXT SwContext;\r | |
393 | EFI_HANDLE SwHandle;\r | |
394 | \r | |
c1d93242 JY |
395 | if (!CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceTpm12Guid)){\r |
396 | DEBUG ((EFI_D_ERROR, "No TPM12 instance required!\n"));\r | |
397 | return EFI_UNSUPPORTED;\r | |
398 | }\r | |
399 | \r | |
0c18794e | 400 | Status = PublishAcpiTable ();\r |
401 | ASSERT_EFI_ERROR (Status);\r | |
402 | \r | |
403 | //\r | |
404 | // Get the Sw dispatch protocol and register SMI callback functions.\r | |
405 | //\r | |
406 | Status = gSmst->SmmLocateProtocol (&gEfiSmmSwDispatch2ProtocolGuid, NULL, (VOID**)&SwDispatch);\r | |
407 | ASSERT_EFI_ERROR (Status);\r | |
408 | SwContext.SwSmiInputValue = (UINTN) -1;\r | |
409 | Status = SwDispatch->Register (SwDispatch, PhysicalPresenceCallback, &SwContext, &SwHandle);\r | |
410 | ASSERT_EFI_ERROR (Status);\r | |
411 | if (EFI_ERROR (Status)) {\r | |
412 | return Status;\r | |
413 | }\r | |
414 | mTcgNvs->PhysicalPresence.SoftwareSmi = (UINT8) SwContext.SwSmiInputValue;\r | |
415 | \r | |
416 | SwContext.SwSmiInputValue = (UINTN) -1;\r | |
417 | Status = SwDispatch->Register (SwDispatch, MemoryClearCallback, &SwContext, &SwHandle);\r | |
418 | ASSERT_EFI_ERROR (Status);\r | |
419 | if (EFI_ERROR (Status)) {\r | |
420 | return Status;\r | |
421 | }\r | |
422 | mTcgNvs->MemoryClear.SoftwareSmi = (UINT8) SwContext.SwSmiInputValue;\r | |
423 | \r | |
424 | //\r | |
425 | // Locate SmmVariableProtocol.\r | |
426 | //\r | |
427 | Status = gSmst->SmmLocateProtocol (&gEfiSmmVariableProtocolGuid, NULL, (VOID**)&mSmmVariable);\r | |
428 | ASSERT_EFI_ERROR (Status);\r | |
429 | \r | |
430 | return EFI_SUCCESS;\r | |
431 | }\r | |
432 | \r |