3 Implement all four UEFI Runtime Variable services for the nonvolatile
4 and volatile storage space and install variable architecture protocol.
6 Copyright (C) 2013, Red Hat, Inc.
7 Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<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
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.
20 extern VARIABLE_STORE_HEADER
*mNvVariableCache
;
21 extern VARIABLE_INFO_ENTRY
*gVariableInfo
;
22 EFI_HANDLE mHandle
= NULL
;
23 EFI_EVENT mVirtualAddressChangeEvent
= NULL
;
24 EFI_EVENT mFtwRegistration
= NULL
;
25 extern LIST_ENTRY mLockedVariableList
;
26 extern LIST_ENTRY mVarCheckVariableList
;
27 extern UINT32 mNumberOfHandler
;
28 extern VAR_CHECK_SET_VARIABLE_CHECK_HANDLER
*mHandlerTable
;
29 extern BOOLEAN mEndOfDxe
;
30 EDKII_VARIABLE_LOCK_PROTOCOL mVariableLock
= { VariableLockRequestToLock
};
31 EDKII_VAR_CHECK_PROTOCOL mVarCheck
= { VarCheckRegisterSetVariableCheckHandler
,
32 VarCheckVariablePropertySet
,
33 VarCheckVariablePropertyGet
};
36 Return TRUE if ExitBootServices () has been called.
38 @retval TRUE If ExitBootServices () has been called.
45 return EfiAtRuntime ();
50 Initializes a basic mutual exclusion lock.
52 This function initializes a basic mutual exclusion lock to the released state
53 and returns the lock. Each lock provides mutual exclusion access at its task
54 priority level. Since there is no preemption or multiprocessor support in EFI,
55 acquiring the lock only consists of raising to the locks TPL.
56 If Lock is NULL, then ASSERT().
57 If Priority is not a valid TPL value, then ASSERT().
59 @param Lock A pointer to the lock data structure to initialize.
60 @param Priority EFI TPL is associated with the lock.
67 IN OUT EFI_LOCK
*Lock
,
71 return EfiInitializeLock (Lock
, Priority
);
76 Acquires lock only at boot time. Simply returns at runtime.
78 This is a temperary function that will be removed when
79 EfiAcquireLock() in UefiLib can handle the call in UEFI
80 Runtimer driver in RT phase.
81 It calls EfiAcquireLock() at boot time, and simply returns
84 @param Lock A pointer to the lock to acquire.
88 AcquireLockOnlyAtBootTime (
93 EfiAcquireLock (Lock
);
99 Releases lock only at boot time. Simply returns at runtime.
101 This is a temperary function which will be removed when
102 EfiReleaseLock() in UefiLib can handle the call in UEFI
103 Runtimer driver in RT phase.
104 It calls EfiReleaseLock() at boot time and simply returns
107 @param Lock A pointer to the lock to release.
111 ReleaseLockOnlyAtBootTime (
116 EfiReleaseLock (Lock
);
121 Retrive the Fault Tolerent Write protocol interface.
123 @param[out] FtwProtocol The interface of Ftw protocol
125 @retval EFI_SUCCESS The FTW protocol instance was found and returned in FtwProtocol.
126 @retval EFI_NOT_FOUND The FTW protocol instance was not found.
127 @retval EFI_INVALID_PARAMETER SarProtocol is NULL.
132 OUT VOID
**FtwProtocol
138 // Locate Fault Tolerent Write protocol
140 Status
= gBS
->LocateProtocol (
141 &gEfiFaultTolerantWriteProtocolGuid
,
149 Retrive the FVB protocol interface by HANDLE.
151 @param[in] FvBlockHandle The handle of FVB protocol that provides services for
152 reading, writing, and erasing the target block.
153 @param[out] FvBlock The interface of FVB protocol
155 @retval EFI_SUCCESS The interface information for the specified protocol was returned.
156 @retval EFI_UNSUPPORTED The device does not support the FVB protocol.
157 @retval EFI_INVALID_PARAMETER FvBlockHandle is not a valid EFI_HANDLE or FvBlock is NULL.
162 IN EFI_HANDLE FvBlockHandle
,
163 OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL
**FvBlock
167 // To get the FVB protocol interface on the handle
169 return gBS
->HandleProtocol (
171 &gEfiFirmwareVolumeBlockProtocolGuid
,
178 Function returns an array of handles that support the FVB protocol
179 in a buffer allocated from pool.
181 @param[out] NumberHandles The number of handles returned in Buffer.
182 @param[out] Buffer A pointer to the buffer to return the requested
183 array of handles that support FVB protocol.
185 @retval EFI_SUCCESS The array of handles was returned in Buffer, and the number of
186 handles in Buffer was returned in NumberHandles.
187 @retval EFI_NOT_FOUND No FVB handle was found.
188 @retval EFI_OUT_OF_RESOURCES There is not enough pool memory to store the matching results.
189 @retval EFI_INVALID_PARAMETER NumberHandles is NULL or Buffer is NULL.
193 GetFvbCountAndBuffer (
194 OUT UINTN
*NumberHandles
,
195 OUT EFI_HANDLE
**Buffer
201 // Locate all handles of Fvb protocol
203 Status
= gBS
->LocateHandleBuffer (
205 &gEfiFirmwareVolumeBlockProtocolGuid
,
215 Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.
217 This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
218 It convers pointer to new virtual address.
220 @param Event Event whose notification function is being invoked.
221 @param Context Pointer to the notification function's context.
226 VariableClassAddressChangeEvent (
234 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->FvbInstance
->GetBlockSize
);
235 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->FvbInstance
->GetPhysicalAddress
);
236 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->FvbInstance
->GetAttributes
);
237 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->FvbInstance
->SetAttributes
);
238 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->FvbInstance
->Read
);
239 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->FvbInstance
->Write
);
240 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->FvbInstance
->EraseBlocks
);
241 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->FvbInstance
);
242 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->PlatformLangCodes
);
243 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->LangCodes
);
244 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->PlatformLang
);
245 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->VariableGlobal
.NonVolatileVariableBase
);
246 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->VariableGlobal
.VolatileVariableBase
);
247 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
->VariableGlobal
.HobVariableBase
);
248 EfiConvertPointer (0x0, (VOID
**) &mVariableModuleGlobal
);
249 EfiConvertPointer (0x0, (VOID
**) &mNvVariableCache
);
250 EfiConvertPointer (0x0, (VOID
**) &mHandlerTable
);
251 for (Index
= 0; Index
< mNumberOfHandler
; Index
++) {
252 EfiConvertPointer (0x0, (VOID
**) &mHandlerTable
[Index
]);
255 Status
= EfiConvertList (0x0, &mLockedVariableList
);
256 ASSERT_EFI_ERROR (Status
);
258 Status
= EfiConvertList (0x0, &mVarCheckVariableList
);
259 ASSERT_EFI_ERROR (Status
);
264 Notification function of EVT_GROUP_READY_TO_BOOT event group.
266 This is a notification function registered on EVT_GROUP_READY_TO_BOOT event group.
267 When the Boot Manager is about to load and execute a boot option, it reclaims variable
268 storage if free size is below the threshold.
270 @param Event Event whose notification function is being invoked.
271 @param Context Pointer to the notification function's context.
282 // Set the End Of DXE bit in case the EFI_END_OF_DXE_EVENT_GROUP_GUID event is not signaled.
286 if (FeaturePcdGet (PcdVariableCollectStatistics
)) {
287 gBS
->InstallConfigurationTable (&gEfiVariableGuid
, gVariableInfo
);
292 Notification function of EFI_END_OF_DXE_EVENT_GROUP_GUID event group.
294 This is a notification function registered on EFI_END_OF_DXE_EVENT_GROUP_GUID event group.
296 @param Event Event whose notification function is being invoked.
297 @param Context Pointer to the notification function's context.
311 Fault Tolerant Write protocol notification event handler.
313 Non-Volatile variable write may needs FTW protocol to reclaim when
316 @param[in] Event Event whose notification function is being invoked.
317 @param[in] Context Pointer to the notification function's context.
322 FtwNotificationEvent (
328 EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL
*FvbProtocol
;
329 EFI_FAULT_TOLERANT_WRITE_PROTOCOL
*FtwProtocol
;
330 EFI_PHYSICAL_ADDRESS NvStorageVariableBase
;
331 EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor
;
332 EFI_PHYSICAL_ADDRESS BaseAddress
;
334 EFI_PHYSICAL_ADDRESS VariableStoreBase
;
335 UINT64 VariableStoreLength
;
336 UINTN FtwMaxBlockSize
;
339 // Ensure FTW protocol is installed.
341 Status
= GetFtwProtocol ((VOID
**) &FtwProtocol
);
342 if (EFI_ERROR (Status
)) {
346 Status
= FtwProtocol
->GetMaxBlockSize (FtwProtocol
, &FtwMaxBlockSize
);
347 if (!EFI_ERROR (Status
)) {
348 ASSERT (PcdGet32 (PcdFlashNvStorageVariableSize
) <= FtwMaxBlockSize
);
352 // Find the proper FVB protocol for variable.
354 NvStorageVariableBase
= (EFI_PHYSICAL_ADDRESS
) PcdGet64 (PcdFlashNvStorageVariableBase64
);
355 if (NvStorageVariableBase
== 0) {
356 NvStorageVariableBase
= (EFI_PHYSICAL_ADDRESS
) PcdGet32 (PcdFlashNvStorageVariableBase
);
358 Status
= GetFvbInfoByAddress (NvStorageVariableBase
, NULL
, &FvbProtocol
);
359 if (EFI_ERROR (Status
)) {
362 mVariableModuleGlobal
->FvbInstance
= FvbProtocol
;
365 // Mark the variable storage region of the FLASH as RUNTIME.
367 VariableStoreBase
= NvStorageVariableBase
+ (((EFI_FIRMWARE_VOLUME_HEADER
*)(UINTN
)(NvStorageVariableBase
))->HeaderLength
);
368 VariableStoreLength
= ((VARIABLE_STORE_HEADER
*)(UINTN
)VariableStoreBase
)->Size
;
369 BaseAddress
= VariableStoreBase
& (~EFI_PAGE_MASK
);
370 Length
= VariableStoreLength
+ (VariableStoreBase
- BaseAddress
);
371 Length
= (Length
+ EFI_PAGE_SIZE
- 1) & (~EFI_PAGE_MASK
);
373 Status
= gDS
->GetMemorySpaceDescriptor (BaseAddress
, &GcdDescriptor
);
374 if (EFI_ERROR (Status
)) {
375 DEBUG ((DEBUG_WARN
, "Variable driver failed to get flash memory attribute.\n"));
377 Status
= gDS
->SetMemorySpaceAttributes (
380 GcdDescriptor
.Attributes
| EFI_MEMORY_RUNTIME
382 if (EFI_ERROR (Status
)) {
383 DEBUG ((DEBUG_WARN
, "Variable driver failed to add EFI_MEMORY_RUNTIME attribute to Flash.\n"));
387 Status
= VariableWriteServiceInitialize ();
388 ASSERT_EFI_ERROR (Status
);
391 // Install the Variable Write Architectural protocol.
393 Status
= gBS
->InstallProtocolInterface (
395 &gEfiVariableWriteArchProtocolGuid
,
396 EFI_NATIVE_INTERFACE
,
399 ASSERT_EFI_ERROR (Status
);
402 // Close the notify event to avoid install gEfiVariableWriteArchProtocolGuid again.
404 gBS
->CloseEvent (Event
);
410 Variable Driver main entry point. The Variable driver places the 4 EFI
411 runtime services in the EFI System Table and installs arch protocols
412 for variable read and write services being availible. It also registers
413 a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
415 @param[in] ImageHandle The firmware allocated handle for the EFI image.
416 @param[in] SystemTable A pointer to the EFI System Table.
418 @retval EFI_SUCCESS Variable service successfully initialized.
423 VariableServiceInitialize (
424 IN EFI_HANDLE ImageHandle
,
425 IN EFI_SYSTEM_TABLE
*SystemTable
429 EFI_EVENT ReadyToBootEvent
;
430 EFI_EVENT EndOfDxeEvent
;
432 Status
= VariableCommonInitialize ();
433 ASSERT_EFI_ERROR (Status
);
435 Status
= gBS
->InstallMultipleProtocolInterfaces (
437 &gEdkiiVariableLockProtocolGuid
,
441 ASSERT_EFI_ERROR (Status
);
443 Status
= gBS
->InstallMultipleProtocolInterfaces (
445 &gEdkiiVarCheckProtocolGuid
,
449 ASSERT_EFI_ERROR (Status
);
451 SystemTable
->RuntimeServices
->GetVariable
= VariableServiceGetVariable
;
452 SystemTable
->RuntimeServices
->GetNextVariableName
= VariableServiceGetNextVariableName
;
453 SystemTable
->RuntimeServices
->SetVariable
= VariableServiceSetVariable
;
454 SystemTable
->RuntimeServices
->QueryVariableInfo
= VariableServiceQueryVariableInfo
;
457 // Now install the Variable Runtime Architectural protocol on a new handle.
459 Status
= gBS
->InstallProtocolInterface (
461 &gEfiVariableArchProtocolGuid
,
462 EFI_NATIVE_INTERFACE
,
465 ASSERT_EFI_ERROR (Status
);
468 // Register FtwNotificationEvent () notify function.
470 EfiCreateProtocolNotifyEvent (
471 &gEfiFaultTolerantWriteProtocolGuid
,
473 FtwNotificationEvent
,
478 Status
= gBS
->CreateEventEx (
481 VariableClassAddressChangeEvent
,
483 &gEfiEventVirtualAddressChangeGuid
,
484 &mVirtualAddressChangeEvent
486 ASSERT_EFI_ERROR (Status
);
489 // Register the event handling function to reclaim variable for OS usage.
491 Status
= EfiCreateEventReadyToBootEx (
497 ASSERT_EFI_ERROR (Status
);
500 // Register the event handling function to set the End Of DXE flag.
502 Status
= gBS
->CreateEventEx (
507 &gEfiEndOfDxeEventGroupGuid
,
510 ASSERT_EFI_ERROR (Status
);