1 /** @file 2 Implement all four UEFI Runtime Variable services for the nonvolatile 3 and volatile storage space and install variable architecture protocol. 4 5 Copyright (C) 2013, Red Hat, Inc. 6 Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR> 7 (C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR> 8 This program and the accompanying materials 9 are licensed and made available under the terms and conditions of the BSD License 10 which accompanies this distribution. The full text of the license may be found at 11 http://opensource.org/licenses/bsd-license.php 12 13 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 14 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 15 16 **/ 17 18 #include "Variable.h" 19 20 extern VARIABLE_STORE_HEADER *mNvVariableCache; 21 extern EFI_FIRMWARE_VOLUME_HEADER *mNvFvHeaderCache; 22 extern VARIABLE_INFO_ENTRY *gVariableInfo; 23 EFI_HANDLE mHandle = NULL; 24 EFI_EVENT mVirtualAddressChangeEvent = NULL; 25 EFI_EVENT mFtwRegistration = NULL; 26 extern BOOLEAN mEndOfDxe; 27 VOID ***mVarCheckAddressPointer = NULL; 28 UINTN mVarCheckAddressPointerCount = 0; 29 EDKII_VARIABLE_LOCK_PROTOCOL mVariableLock = { VariableLockRequestToLock }; 30 EDKII_VAR_CHECK_PROTOCOL mVarCheck = { VarCheckRegisterSetVariableCheckHandler, 31 VarCheckVariablePropertySet, 32 VarCheckVariablePropertyGet }; 33 34 /** 35 Return TRUE if ExitBootServices () has been called. 36 37 @retval TRUE If ExitBootServices () has been called. 38 **/ 39 BOOLEAN 40 AtRuntime ( 41 VOID 42 ) 43 { 44 return EfiAtRuntime (); 45 } 46 47 48 /** 49 Initializes a basic mutual exclusion lock. 50 51 This function initializes a basic mutual exclusion lock to the released state 52 and returns the lock. Each lock provides mutual exclusion access at its task 53 priority level. Since there is no preemption or multiprocessor support in EFI, 54 acquiring the lock only consists of raising to the locks TPL. 55 If Lock is NULL, then ASSERT(). 56 If Priority is not a valid TPL value, then ASSERT(). 57 58 @param Lock A pointer to the lock data structure to initialize. 59 @param Priority EFI TPL is associated with the lock. 60 61 @return The lock. 62 63 **/ 64 EFI_LOCK * 65 InitializeLock ( 66 IN OUT EFI_LOCK *Lock, 67 IN EFI_TPL Priority 68 ) 69 { 70 return EfiInitializeLock (Lock, Priority); 71 } 72 73 74 /** 75 Acquires lock only at boot time. Simply returns at runtime. 76 77 This is a temperary function that will be removed when 78 EfiAcquireLock() in UefiLib can handle the call in UEFI 79 Runtimer driver in RT phase. 80 It calls EfiAcquireLock() at boot time, and simply returns 81 at runtime. 82 83 @param Lock A pointer to the lock to acquire. 84 85 **/ 86 VOID 87 AcquireLockOnlyAtBootTime ( 88 IN EFI_LOCK *Lock 89 ) 90 { 91 if (!AtRuntime ()) { 92 EfiAcquireLock (Lock); 93 } 94 } 95 96 97 /** 98 Releases lock only at boot time. Simply returns at runtime. 99 100 This is a temperary function which will be removed when 101 EfiReleaseLock() in UefiLib can handle the call in UEFI 102 Runtimer driver in RT phase. 103 It calls EfiReleaseLock() at boot time and simply returns 104 at runtime. 105 106 @param Lock A pointer to the lock to release. 107 108 **/ 109 VOID 110 ReleaseLockOnlyAtBootTime ( 111 IN EFI_LOCK *Lock 112 ) 113 { 114 if (!AtRuntime ()) { 115 EfiReleaseLock (Lock); 116 } 117 } 118 119 /** 120 Retrieve the Fault Tolerent Write protocol interface. 121 122 @param[out] FtwProtocol The interface of Ftw protocol 123 124 @retval EFI_SUCCESS The FTW protocol instance was found and returned in FtwProtocol. 125 @retval EFI_NOT_FOUND The FTW protocol instance was not found. 126 @retval EFI_INVALID_PARAMETER SarProtocol is NULL. 127 128 **/ 129 EFI_STATUS 130 GetFtwProtocol ( 131 OUT VOID **FtwProtocol 132 ) 133 { 134 EFI_STATUS Status; 135 136 // 137 // Locate Fault Tolerent Write protocol 138 // 139 Status = gBS->LocateProtocol ( 140 &gEfiFaultTolerantWriteProtocolGuid, 141 NULL, 142 FtwProtocol 143 ); 144 return Status; 145 } 146 147 /** 148 Retrieve the FVB protocol interface by HANDLE. 149 150 @param[in] FvBlockHandle The handle of FVB protocol that provides services for 151 reading, writing, and erasing the target block. 152 @param[out] FvBlock The interface of FVB protocol 153 154 @retval EFI_SUCCESS The interface information for the specified protocol was returned. 155 @retval EFI_UNSUPPORTED The device does not support the FVB protocol. 156 @retval EFI_INVALID_PARAMETER FvBlockHandle is not a valid EFI_HANDLE or FvBlock is NULL. 157 158 **/ 159 EFI_STATUS 160 GetFvbByHandle ( 161 IN EFI_HANDLE FvBlockHandle, 162 OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock 163 ) 164 { 165 // 166 // To get the FVB protocol interface on the handle 167 // 168 return gBS->HandleProtocol ( 169 FvBlockHandle, 170 &gEfiFirmwareVolumeBlockProtocolGuid, 171 (VOID **) FvBlock 172 ); 173 } 174 175 176 /** 177 Function returns an array of handles that support the FVB protocol 178 in a buffer allocated from pool. 179 180 @param[out] NumberHandles The number of handles returned in Buffer. 181 @param[out] Buffer A pointer to the buffer to return the requested 182 array of handles that support FVB protocol. 183 184 @retval EFI_SUCCESS The array of handles was returned in Buffer, and the number of 185 handles in Buffer was returned in NumberHandles. 186 @retval EFI_NOT_FOUND No FVB handle was found. 187 @retval EFI_OUT_OF_RESOURCES There is not enough pool memory to store the matching results. 188 @retval EFI_INVALID_PARAMETER NumberHandles is NULL or Buffer is NULL. 189 190 **/ 191 EFI_STATUS 192 GetFvbCountAndBuffer ( 193 OUT UINTN *NumberHandles, 194 OUT EFI_HANDLE **Buffer 195 ) 196 { 197 EFI_STATUS Status; 198 199 // 200 // Locate all handles of Fvb protocol 201 // 202 Status = gBS->LocateHandleBuffer ( 203 ByProtocol, 204 &gEfiFirmwareVolumeBlockProtocolGuid, 205 NULL, 206 NumberHandles, 207 Buffer 208 ); 209 return Status; 210 } 211 212 213 /** 214 Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE. 215 216 This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event. 217 It convers pointer to new virtual address. 218 219 @param Event Event whose notification function is being invoked. 220 @param Context Pointer to the notification function's context. 221 222 **/ 223 VOID 224 EFIAPI 225 VariableClassAddressChangeEvent ( 226 IN EFI_EVENT Event, 227 IN VOID *Context 228 ) 229 { 230 UINTN Index; 231 232 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->GetBlockSize); 233 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->GetPhysicalAddress); 234 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->GetAttributes); 235 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->SetAttributes); 236 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->Read); 237 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->Write); 238 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance->EraseBlocks); 239 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->FvbInstance); 240 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->PlatformLangCodes); 241 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->LangCodes); 242 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->PlatformLang); 243 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase); 244 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->VariableGlobal.VolatileVariableBase); 245 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->VariableGlobal.HobVariableBase); 246 EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal); 247 EfiConvertPointer (0x0, (VOID **) &mNvVariableCache); 248 EfiConvertPointer (0x0, (VOID **) &mNvFvHeaderCache); 249 250 if (mAuthContextOut.AddressPointer != NULL) { 251 for (Index = 0; Index < mAuthContextOut.AddressPointerCount; Index++) { 252 EfiConvertPointer (0x0, (VOID **) mAuthContextOut.AddressPointer[Index]); 253 } 254 } 255 256 if (mVarCheckAddressPointer != NULL) { 257 for (Index = 0; Index < mVarCheckAddressPointerCount; Index++) { 258 EfiConvertPointer (0x0, (VOID **) mVarCheckAddressPointer[Index]); 259 } 260 } 261 } 262 263 264 /** 265 Notification function of EVT_GROUP_READY_TO_BOOT event group. 266 267 This is a notification function registered on EVT_GROUP_READY_TO_BOOT event group. 268 When the Boot Manager is about to load and execute a boot option, it reclaims variable 269 storage if free size is below the threshold. 270 271 @param Event Event whose notification function is being invoked. 272 @param Context Pointer to the notification function's context. 273 274 **/ 275 VOID 276 EFIAPI 277 OnReadyToBoot ( 278 EFI_EVENT Event, 279 VOID *Context 280 ) 281 { 282 if (!mEndOfDxe) { 283 // 284 // Set the End Of DXE bit in case the EFI_END_OF_DXE_EVENT_GROUP_GUID event is not signaled. 285 // 286 mEndOfDxe = TRUE; 287 mVarCheckAddressPointer = VarCheckLibInitializeAtEndOfDxe (&mVarCheckAddressPointerCount); 288 // 289 // The initialization for variable quota. 290 // 291 InitializeVariableQuota (); 292 } 293 ReclaimForOS (); 294 if (FeaturePcdGet (PcdVariableCollectStatistics)) { 295 if (mVariableModuleGlobal->VariableGlobal.AuthFormat) { 296 gBS->InstallConfigurationTable (&gEfiAuthenticatedVariableGuid, gVariableInfo); 297 } else { 298 gBS->InstallConfigurationTable (&gEfiVariableGuid, gVariableInfo); 299 } 300 } 301 302 gBS->CloseEvent (Event); 303 } 304 305 /** 306 Notification function of EFI_END_OF_DXE_EVENT_GROUP_GUID event group. 307 308 This is a notification function registered on EFI_END_OF_DXE_EVENT_GROUP_GUID event group. 309 310 @param Event Event whose notification function is being invoked. 311 @param Context Pointer to the notification function's context. 312 313 **/ 314 VOID 315 EFIAPI 316 OnEndOfDxe ( 317 EFI_EVENT Event, 318 VOID *Context 319 ) 320 { 321 DEBUG ((EFI_D_INFO, "[Variable]END_OF_DXE is signaled\n")); 322 mEndOfDxe = TRUE; 323 mVarCheckAddressPointer = VarCheckLibInitializeAtEndOfDxe (&mVarCheckAddressPointerCount); 324 // 325 // The initialization for variable quota. 326 // 327 InitializeVariableQuota (); 328 if (PcdGetBool (PcdReclaimVariableSpaceAtEndOfDxe)) { 329 ReclaimForOS (); 330 } 331 332 gBS->CloseEvent (Event); 333 } 334 335 /** 336 Fault Tolerant Write protocol notification event handler. 337 338 Non-Volatile variable write may needs FTW protocol to reclaim when 339 writting variable. 340 341 @param[in] Event Event whose notification function is being invoked. 342 @param[in] Context Pointer to the notification function's context. 343 344 **/ 345 VOID 346 EFIAPI 347 FtwNotificationEvent ( 348 IN EFI_EVENT Event, 349 IN VOID *Context 350 ) 351 { 352 EFI_STATUS Status; 353 EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvbProtocol; 354 EFI_FAULT_TOLERANT_WRITE_PROTOCOL *FtwProtocol; 355 EFI_PHYSICAL_ADDRESS NvStorageVariableBase; 356 EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor; 357 EFI_PHYSICAL_ADDRESS BaseAddress; 358 UINT64 Length; 359 EFI_PHYSICAL_ADDRESS VariableStoreBase; 360 UINT64 VariableStoreLength; 361 UINTN FtwMaxBlockSize; 362 363 // 364 // Ensure FTW protocol is installed. 365 // 366 Status = GetFtwProtocol ((VOID**) &FtwProtocol); 367 if (EFI_ERROR (Status)) { 368 return ; 369 } 370 371 Status = FtwProtocol->GetMaxBlockSize (FtwProtocol, &FtwMaxBlockSize); 372 if (!EFI_ERROR (Status)) { 373 ASSERT (PcdGet32 (PcdFlashNvStorageVariableSize) <= FtwMaxBlockSize); 374 } 375 376 // 377 // Find the proper FVB protocol for variable. 378 // 379 NvStorageVariableBase = (EFI_PHYSICAL_ADDRESS) PcdGet64 (PcdFlashNvStorageVariableBase64); 380 if (NvStorageVariableBase == 0) { 381 NvStorageVariableBase = (EFI_PHYSICAL_ADDRESS) PcdGet32 (PcdFlashNvStorageVariableBase); 382 } 383 Status = GetFvbInfoByAddress (NvStorageVariableBase, NULL, &FvbProtocol); 384 if (EFI_ERROR (Status)) { 385 return ; 386 } 387 mVariableModuleGlobal->FvbInstance = FvbProtocol; 388 389 // 390 // Mark the variable storage region of the FLASH as RUNTIME. 391 // 392 VariableStoreBase = NvStorageVariableBase + (((EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)(NvStorageVariableBase))->HeaderLength); 393 VariableStoreLength = ((VARIABLE_STORE_HEADER *)(UINTN)VariableStoreBase)->Size; 394 BaseAddress = VariableStoreBase & (~EFI_PAGE_MASK); 395 Length = VariableStoreLength + (VariableStoreBase - BaseAddress); 396 Length = (Length + EFI_PAGE_SIZE - 1) & (~EFI_PAGE_MASK); 397 398 Status = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor); 399 if (EFI_ERROR (Status)) { 400 DEBUG ((DEBUG_WARN, "Variable driver failed to get flash memory attribute.\n")); 401 } else { 402 Status = gDS->SetMemorySpaceAttributes ( 403 BaseAddress, 404 Length, 405 GcdDescriptor.Attributes | EFI_MEMORY_RUNTIME 406 ); 407 if (EFI_ERROR (Status)) { 408 DEBUG ((DEBUG_WARN, "Variable driver failed to add EFI_MEMORY_RUNTIME attribute to Flash.\n")); 409 } 410 } 411 412 Status = VariableWriteServiceInitialize (); 413 if (EFI_ERROR (Status)) { 414 DEBUG ((DEBUG_ERROR, "Variable write service initialization failed. Status = %r\n", Status)); 415 } 416 417 // 418 // Install the Variable Write Architectural protocol. 419 // 420 Status = gBS->InstallProtocolInterface ( 421 &mHandle, 422 &gEfiVariableWriteArchProtocolGuid, 423 EFI_NATIVE_INTERFACE, 424 NULL 425 ); 426 ASSERT_EFI_ERROR (Status); 427 428 // 429 // Close the notify event to avoid install gEfiVariableWriteArchProtocolGuid again. 430 // 431 gBS->CloseEvent (Event); 432 433 } 434 435 436 /** 437 Variable Driver main entry point. The Variable driver places the 4 EFI 438 runtime services in the EFI System Table and installs arch protocols 439 for variable read and write services being available. It also registers 440 a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event. 441 442 @param[in] ImageHandle The firmware allocated handle for the EFI image. 443 @param[in] SystemTable A pointer to the EFI System Table. 444 445 @retval EFI_SUCCESS Variable service successfully initialized. 446 447 **/ 448 EFI_STATUS 449 EFIAPI 450 VariableServiceInitialize ( 451 IN EFI_HANDLE ImageHandle, 452 IN EFI_SYSTEM_TABLE *SystemTable 453 ) 454 { 455 EFI_STATUS Status; 456 EFI_EVENT ReadyToBootEvent; 457 EFI_EVENT EndOfDxeEvent; 458 459 Status = VariableCommonInitialize (); 460 ASSERT_EFI_ERROR (Status); 461 462 Status = gBS->InstallMultipleProtocolInterfaces ( 463 &mHandle, 464 &gEdkiiVariableLockProtocolGuid, 465 &mVariableLock, 466 NULL 467 ); 468 ASSERT_EFI_ERROR (Status); 469 470 Status = gBS->InstallMultipleProtocolInterfaces ( 471 &mHandle, 472 &gEdkiiVarCheckProtocolGuid, 473 &mVarCheck, 474 NULL 475 ); 476 ASSERT_EFI_ERROR (Status); 477 478 SystemTable->RuntimeServices->GetVariable = VariableServiceGetVariable; 479 SystemTable->RuntimeServices->GetNextVariableName = VariableServiceGetNextVariableName; 480 SystemTable->RuntimeServices->SetVariable = VariableServiceSetVariable; 481 SystemTable->RuntimeServices->QueryVariableInfo = VariableServiceQueryVariableInfo; 482 483 // 484 // Now install the Variable Runtime Architectural protocol on a new handle. 485 // 486 Status = gBS->InstallProtocolInterface ( 487 &mHandle, 488 &gEfiVariableArchProtocolGuid, 489 EFI_NATIVE_INTERFACE, 490 NULL 491 ); 492 ASSERT_EFI_ERROR (Status); 493 494 // 495 // Register FtwNotificationEvent () notify function. 496 // 497 EfiCreateProtocolNotifyEvent ( 498 &gEfiFaultTolerantWriteProtocolGuid, 499 TPL_CALLBACK, 500 FtwNotificationEvent, 501 (VOID *)SystemTable, 502 &mFtwRegistration 503 ); 504 505 Status = gBS->CreateEventEx ( 506 EVT_NOTIFY_SIGNAL, 507 TPL_NOTIFY, 508 VariableClassAddressChangeEvent, 509 NULL, 510 &gEfiEventVirtualAddressChangeGuid, 511 &mVirtualAddressChangeEvent 512 ); 513 ASSERT_EFI_ERROR (Status); 514 515 // 516 // Register the event handling function to reclaim variable for OS usage. 517 // 518 Status = EfiCreateEventReadyToBootEx ( 519 TPL_NOTIFY, 520 OnReadyToBoot, 521 NULL, 522 &ReadyToBootEvent 523 ); 524 ASSERT_EFI_ERROR (Status); 525 526 // 527 // Register the event handling function to set the End Of DXE flag. 528 // 529 Status = gBS->CreateEventEx ( 530 EVT_NOTIFY_SIGNAL, 531 TPL_NOTIFY, 532 OnEndOfDxe, 533 NULL, 534 &gEfiEndOfDxeEventGroupGuid, 535 &EndOfDxeEvent 536 ); 537 ASSERT_EFI_ERROR (Status); 538 539 return EFI_SUCCESS; 540 } 541 542