| 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 - 2014, Intel Corporation. All rights reserved.<BR>\r |
| 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 |
| 22 | #include "TcgSmm.h"\r |
| 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 |
| 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 |
| 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 |
| 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 |
| 73 | return EFI_SUCCESS;\r |
| 74 | }\r |
| 75 | \r |
| 76 | DEBUG ((EFI_D_INFO, "[TPM] PP callback, Parameter = %x\n", mTcgNvs->PhysicalPresence.Parameter));\r |
| 77 | if (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_RETURN_REQUEST_RESPONSE_TO_OS) {\r |
| 78 | mTcgNvs->PhysicalPresence.LastRequest = PpData.LastPPRequest;\r |
| 79 | mTcgNvs->PhysicalPresence.Response = PpData.PPResponse;\r |
| 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 |
| 82 | if (mTcgNvs->PhysicalPresence.Request == PHYSICAL_PRESENCE_SET_OPERATOR_AUTH) {\r |
| 83 | //\r |
| 84 | // This command requires UI to prompt user for Auth data.\r |
| 85 | //\r |
| 86 | mTcgNvs->PhysicalPresence.ReturnCode = PP_SUBMIT_REQUEST_NOT_IMPLEMENTED;\r |
| 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 |
| 103 | mTcgNvs->PhysicalPresence.ReturnCode = PP_SUBMIT_REQUEST_GENERAL_FAILURE;\r |
| 104 | return EFI_SUCCESS;\r |
| 105 | }\r |
| 106 | mTcgNvs->PhysicalPresence.ReturnCode = PP_SUBMIT_REQUEST_SUCCESS;\r |
| 107 | } else if (mTcgNvs->PhysicalPresence.Parameter == ACPI_FUNCTION_GET_USER_CONFIRMATION_STATUS_FOR_REQUEST) {\r |
| 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 |
| 121 | DEBUG ((EFI_D_ERROR, "[TPM] Get PP flags failure! Status = %r\n", Status));\r |
| 122 | return EFI_SUCCESS;\r |
| 123 | }\r |
| 124 | \r |
| 125 | RequestConfirmed = FALSE;\r |
| 126 | \r |
| 127 | switch (mTcgNvs->PhysicalPresence.Request) {\r |
| 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 |
| 138 | if ((Flags & FLAG_NO_PPI_PROVISION) != 0) {\r |
| 139 | RequestConfirmed = TRUE;\r |
| 140 | }\r |
| 141 | break;\r |
| 142 | \r |
| 143 | case PHYSICAL_PRESENCE_CLEAR:\r |
| 144 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_CLEAR:\r |
| 145 | if ((Flags & FLAG_NO_PPI_CLEAR) != 0) {\r |
| 146 | RequestConfirmed = TRUE;\r |
| 147 | }\r |
| 148 | break;\r |
| 149 | \r |
| 150 | case PHYSICAL_PRESENCE_DEFERRED_PP_UNOWNERED_FIELD_UPGRADE:\r |
| 151 | if ((Flags & FLAG_NO_PPI_MAINTENANCE) != 0) {\r |
| 152 | RequestConfirmed = TRUE;\r |
| 153 | }\r |
| 154 | break;\r |
| 155 | \r |
| 156 | case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_CLEAR_ENABLE_ACTIVATE:\r |
| 157 | case PHYSICAL_PRESENCE_CLEAR_ENABLE_ACTIVATE:\r |
| 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 |
| 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 |
| 167 | RequestConfirmed = TRUE;\r |
| 168 | break;\r |
| 169 | \r |
| 170 | case PHYSICAL_PRESENCE_SET_OPERATOR_AUTH:\r |
| 171 | //\r |
| 172 | // This command requires UI to prompt user for Auth data\r |
| 173 | //\r |
| 174 | mTcgNvs->PhysicalPresence.ReturnCode = PP_REQUEST_NOT_IMPLEMENTED; \r |
| 175 | return EFI_SUCCESS;\r |
| 176 | }\r |
| 177 | \r |
| 178 | if (RequestConfirmed) {\r |
| 179 | mTcgNvs->PhysicalPresence.ReturnCode = PP_REQUEST_ALLOWED_AND_PPUSER_NOT_REQUIRED;\r |
| 180 | } else {\r |
| 181 | mTcgNvs->PhysicalPresence.ReturnCode = PP_REQUEST_ALLOWED_AND_PPUSER_REQUIRED;\r |
| 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 |
| 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 |
| 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 |
| 219 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_SUCCESS;\r |
| 220 | if (mTcgNvs->MemoryClear.Parameter == ACPI_FUNCTION_DSM_MEMORY_CLEAR_INTERFACE) {\r |
| 221 | MorControl = (UINT8) mTcgNvs->MemoryClear.Request;\r |
| 222 | } else if (mTcgNvs->MemoryClear.Parameter == ACPI_FUNCTION_PTS_CLEAR_MOR_BIT) {\r |
| 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 |
| 232 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;\r |
| 233 | DEBUG ((EFI_D_ERROR, "[TPM] Get MOR variable failure! Status = %r\n", Status));\r |
| 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 |
| 251 | if (EFI_ERROR (Status)) { \r |
| 252 | mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;\r |
| 253 | DEBUG ((EFI_D_ERROR, "[TPM] Set MOR variable failure! Status = %r\n", Status));\r |
| 254 | }\r |
| 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 |
| 289 | if ((OpRegion->OpRegionOp == AML_EXT_REGION_OP) && \r |
| 290 | (OpRegion->NameString == Name) &&\r |
| 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 |
| 298 | OpRegion->RegionLen = (UINT8) Size;\r |
| 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 |
| 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 |
| 347 | ASSERT (Table->OemTableId == SIGNATURE_64 ('T', 'c', 'g', 'T', 'a', 'b', 'l', 'e'));\r |
| 348 | CopyMem (Table->OemId, PcdGetPtr (PcdAcpiDefaultOemId), sizeof (Table->OemId) );\r |
| 349 | mTcgNvs = AssignOpRegion (Table, SIGNATURE_32 ('T', 'N', 'V', 'S'), (UINT16) sizeof (TCG_NVS));\r |
| 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 |
| 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 |
| 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 |