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1. Update AuthVarialbe driver to avoid integer overflow when using EFI_VARIABLE_AUTHE...
[mirror_edk2.git] / SecurityPkg / VariableAuthenticated / RuntimeDxe / Variable.c
1 /** @file
2 The common variable operation routines shared by DXE_RINTIME variable
3 module and DXE_SMM variable module.
4
5 Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
6 This program and the accompanying materials
7 are licensed and made available under the terms and conditions of the BSD License
8 which accompanies this distribution. The full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.php
10
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
13
14 **/
15
16 #include "Variable.h"
17 #include "AuthService.h"
18
19 VARIABLE_MODULE_GLOBAL *mVariableModuleGlobal;
20
21 ///
22 /// Define a memory cache that improves the search performance for a variable.
23 ///
24 VARIABLE_STORE_HEADER *mNvVariableCache = NULL;
25
26 ///
27 /// The memory entry used for variable statistics data.
28 ///
29 VARIABLE_INFO_ENTRY *gVariableInfo = NULL;
30
31
32 /**
33 Routine used to track statistical information about variable usage.
34 The data is stored in the EFI system table so it can be accessed later.
35 VariableInfo.efi can dump out the table. Only Boot Services variable
36 accesses are tracked by this code. The PcdVariableCollectStatistics
37 build flag controls if this feature is enabled.
38
39 A read that hits in the cache will have Read and Cache true for
40 the transaction. Data is allocated by this routine, but never
41 freed.
42
43 @param[in] VariableName Name of the Variable to track.
44 @param[in] VendorGuid Guid of the Variable to track.
45 @param[in] Volatile TRUE if volatile FALSE if non-volatile.
46 @param[in] Read TRUE if GetVariable() was called.
47 @param[in] Write TRUE if SetVariable() was called.
48 @param[in] Delete TRUE if deleted via SetVariable().
49 @param[in] Cache TRUE for a cache hit.
50
51 **/
52 VOID
53 UpdateVariableInfo (
54 IN CHAR16 *VariableName,
55 IN EFI_GUID *VendorGuid,
56 IN BOOLEAN Volatile,
57 IN BOOLEAN Read,
58 IN BOOLEAN Write,
59 IN BOOLEAN Delete,
60 IN BOOLEAN Cache
61 )
62 {
63 VARIABLE_INFO_ENTRY *Entry;
64
65 if (FeaturePcdGet (PcdVariableCollectStatistics)) {
66
67 if (AtRuntime ()) {
68 // Don't collect statistics at runtime.
69 return;
70 }
71
72 if (gVariableInfo == NULL) {
73 //
74 // On the first call allocate a entry and place a pointer to it in
75 // the EFI System Table.
76 //
77 gVariableInfo = AllocateZeroPool (sizeof (VARIABLE_INFO_ENTRY));
78 ASSERT (gVariableInfo != NULL);
79
80 CopyGuid (&gVariableInfo->VendorGuid, VendorGuid);
81 gVariableInfo->Name = AllocatePool (StrSize (VariableName));
82 ASSERT (gVariableInfo->Name != NULL);
83 StrCpy (gVariableInfo->Name, VariableName);
84 gVariableInfo->Volatile = Volatile;
85 }
86
87
88 for (Entry = gVariableInfo; Entry != NULL; Entry = Entry->Next) {
89 if (CompareGuid (VendorGuid, &Entry->VendorGuid)) {
90 if (StrCmp (VariableName, Entry->Name) == 0) {
91 if (Read) {
92 Entry->ReadCount++;
93 }
94 if (Write) {
95 Entry->WriteCount++;
96 }
97 if (Delete) {
98 Entry->DeleteCount++;
99 }
100 if (Cache) {
101 Entry->CacheCount++;
102 }
103
104 return;
105 }
106 }
107
108 if (Entry->Next == NULL) {
109 //
110 // If the entry is not in the table add it.
111 // Next iteration of the loop will fill in the data.
112 //
113 Entry->Next = AllocateZeroPool (sizeof (VARIABLE_INFO_ENTRY));
114 ASSERT (Entry->Next != NULL);
115
116 CopyGuid (&Entry->Next->VendorGuid, VendorGuid);
117 Entry->Next->Name = AllocatePool (StrSize (VariableName));
118 ASSERT (Entry->Next->Name != NULL);
119 StrCpy (Entry->Next->Name, VariableName);
120 Entry->Next->Volatile = Volatile;
121 }
122
123 }
124 }
125 }
126
127
128 /**
129
130 This code checks if variable header is valid or not.
131
132 @param Variable Pointer to the Variable Header.
133
134 @retval TRUE Variable header is valid.
135 @retval FALSE Variable header is not valid.
136
137 **/
138 BOOLEAN
139 IsValidVariableHeader (
140 IN VARIABLE_HEADER *Variable
141 )
142 {
143 if (Variable == NULL || Variable->StartId != VARIABLE_DATA) {
144 return FALSE;
145 }
146
147 return TRUE;
148 }
149
150
151 /**
152
153 This function writes data to the FWH at the correct LBA even if the LBAs
154 are fragmented.
155
156 @param Global Pointer to VARAIBLE_GLOBAL structure.
157 @param Volatile Point out the Variable is Volatile or Non-Volatile.
158 @param SetByIndex TRUE if target pointer is given as index.
159 FALSE if target pointer is absolute.
160 @param Fvb Pointer to the writable FVB protocol.
161 @param DataPtrIndex Pointer to the Data from the end of VARIABLE_STORE_HEADER
162 structure.
163 @param DataSize Size of data to be written.
164 @param Buffer Pointer to the buffer from which data is written.
165
166 @retval EFI_INVALID_PARAMETER Parameters not valid.
167 @retval EFI_SUCCESS Variable store successfully updated.
168
169 **/
170 EFI_STATUS
171 UpdateVariableStore (
172 IN VARIABLE_GLOBAL *Global,
173 IN BOOLEAN Volatile,
174 IN BOOLEAN SetByIndex,
175 IN EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb,
176 IN UINTN DataPtrIndex,
177 IN UINT32 DataSize,
178 IN UINT8 *Buffer
179 )
180 {
181 EFI_FV_BLOCK_MAP_ENTRY *PtrBlockMapEntry;
182 UINTN BlockIndex2;
183 UINTN LinearOffset;
184 UINTN CurrWriteSize;
185 UINTN CurrWritePtr;
186 UINT8 *CurrBuffer;
187 EFI_LBA LbaNumber;
188 UINTN Size;
189 EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
190 VARIABLE_STORE_HEADER *VolatileBase;
191 EFI_PHYSICAL_ADDRESS FvVolHdr;
192 EFI_PHYSICAL_ADDRESS DataPtr;
193 EFI_STATUS Status;
194
195 FwVolHeader = NULL;
196 DataPtr = DataPtrIndex;
197
198 //
199 // Check if the Data is Volatile.
200 //
201 if (!Volatile) {
202 if (Fvb == NULL) {
203 return EFI_INVALID_PARAMETER;
204 }
205 Status = Fvb->GetPhysicalAddress(Fvb, &FvVolHdr);
206 ASSERT_EFI_ERROR (Status);
207
208 FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvVolHdr);
209 //
210 // Data Pointer should point to the actual Address where data is to be
211 // written.
212 //
213 if (SetByIndex) {
214 DataPtr += mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase;
215 }
216
217 if ((DataPtr + DataSize) >= ((EFI_PHYSICAL_ADDRESS) (UINTN) ((UINT8 *) FwVolHeader + FwVolHeader->FvLength))) {
218 return EFI_INVALID_PARAMETER;
219 }
220 } else {
221 //
222 // Data Pointer should point to the actual Address where data is to be
223 // written.
224 //
225 VolatileBase = (VARIABLE_STORE_HEADER *) ((UINTN) mVariableModuleGlobal->VariableGlobal.VolatileVariableBase);
226 if (SetByIndex) {
227 DataPtr += mVariableModuleGlobal->VariableGlobal.VolatileVariableBase;
228 }
229
230 if ((DataPtr + DataSize) >= ((UINTN) ((UINT8 *) VolatileBase + VolatileBase->Size))) {
231 return EFI_INVALID_PARAMETER;
232 }
233
234 //
235 // If Volatile Variable just do a simple mem copy.
236 //
237 CopyMem ((UINT8 *)(UINTN)DataPtr, Buffer, DataSize);
238 return EFI_SUCCESS;
239 }
240
241 //
242 // If we are here we are dealing with Non-Volatile Variables.
243 //
244 LinearOffset = (UINTN) FwVolHeader;
245 CurrWritePtr = (UINTN) DataPtr;
246 CurrWriteSize = DataSize;
247 CurrBuffer = Buffer;
248 LbaNumber = 0;
249
250 if (CurrWritePtr < LinearOffset) {
251 return EFI_INVALID_PARAMETER;
252 }
253
254 for (PtrBlockMapEntry = FwVolHeader->BlockMap; PtrBlockMapEntry->NumBlocks != 0; PtrBlockMapEntry++) {
255 for (BlockIndex2 = 0; BlockIndex2 < PtrBlockMapEntry->NumBlocks; BlockIndex2++) {
256 //
257 // Check to see if the Variable Writes are spanning through multiple
258 // blocks.
259 //
260 if ((CurrWritePtr >= LinearOffset) && (CurrWritePtr < LinearOffset + PtrBlockMapEntry->Length)) {
261 if ((CurrWritePtr + CurrWriteSize) <= (LinearOffset + PtrBlockMapEntry->Length)) {
262 Status = Fvb->Write (
263 Fvb,
264 LbaNumber,
265 (UINTN) (CurrWritePtr - LinearOffset),
266 &CurrWriteSize,
267 CurrBuffer
268 );
269 return Status;
270 } else {
271 Size = (UINT32) (LinearOffset + PtrBlockMapEntry->Length - CurrWritePtr);
272 Status = Fvb->Write (
273 Fvb,
274 LbaNumber,
275 (UINTN) (CurrWritePtr - LinearOffset),
276 &Size,
277 CurrBuffer
278 );
279 if (EFI_ERROR (Status)) {
280 return Status;
281 }
282
283 CurrWritePtr = LinearOffset + PtrBlockMapEntry->Length;
284 CurrBuffer = CurrBuffer + Size;
285 CurrWriteSize = CurrWriteSize - Size;
286 }
287 }
288
289 LinearOffset += PtrBlockMapEntry->Length;
290 LbaNumber++;
291 }
292 }
293
294 return EFI_SUCCESS;
295 }
296
297
298 /**
299
300 This code gets the current status of Variable Store.
301
302 @param VarStoreHeader Pointer to the Variable Store Header.
303
304 @retval EfiRaw Variable store status is raw.
305 @retval EfiValid Variable store status is valid.
306 @retval EfiInvalid Variable store status is invalid.
307
308 **/
309 VARIABLE_STORE_STATUS
310 GetVariableStoreStatus (
311 IN VARIABLE_STORE_HEADER *VarStoreHeader
312 )
313 {
314 if (CompareGuid (&VarStoreHeader->Signature, &gEfiAuthenticatedVariableGuid) &&
315 VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&
316 VarStoreHeader->State == VARIABLE_STORE_HEALTHY
317 ) {
318
319 return EfiValid;
320 } else if (((UINT32 *)(&VarStoreHeader->Signature))[0] == 0xffffffff &&
321 ((UINT32 *)(&VarStoreHeader->Signature))[1] == 0xffffffff &&
322 ((UINT32 *)(&VarStoreHeader->Signature))[2] == 0xffffffff &&
323 ((UINT32 *)(&VarStoreHeader->Signature))[3] == 0xffffffff &&
324 VarStoreHeader->Size == 0xffffffff &&
325 VarStoreHeader->Format == 0xff &&
326 VarStoreHeader->State == 0xff
327 ) {
328
329 return EfiRaw;
330 } else {
331 return EfiInvalid;
332 }
333 }
334
335
336 /**
337
338 This code gets the size of name of variable.
339
340 @param Variable Pointer to the Variable Header.
341
342 @return UINTN Size of variable in bytes.
343
344 **/
345 UINTN
346 NameSizeOfVariable (
347 IN VARIABLE_HEADER *Variable
348 )
349 {
350 if (Variable->State == (UINT8) (-1) ||
351 Variable->DataSize == (UINT32) (-1) ||
352 Variable->NameSize == (UINT32) (-1) ||
353 Variable->Attributes == (UINT32) (-1)) {
354 return 0;
355 }
356 return (UINTN) Variable->NameSize;
357 }
358
359 /**
360
361 This code gets the size of variable data.
362
363 @param Variable Pointer to the Variable Header.
364
365 @return Size of variable in bytes.
366
367 **/
368 UINTN
369 DataSizeOfVariable (
370 IN VARIABLE_HEADER *Variable
371 )
372 {
373 if (Variable->State == (UINT8) (-1) ||
374 Variable->DataSize == (UINT32) (-1) ||
375 Variable->NameSize == (UINT32) (-1) ||
376 Variable->Attributes == (UINT32) (-1)) {
377 return 0;
378 }
379 return (UINTN) Variable->DataSize;
380 }
381
382 /**
383
384 This code gets the pointer to the variable name.
385
386 @param Variable Pointer to the Variable Header.
387
388 @return Pointer to Variable Name which is Unicode encoding.
389
390 **/
391 CHAR16 *
392 GetVariableNamePtr (
393 IN VARIABLE_HEADER *Variable
394 )
395 {
396
397 return (CHAR16 *) (Variable + 1);
398 }
399
400 /**
401
402 This code gets the pointer to the variable data.
403
404 @param Variable Pointer to the Variable Header.
405
406 @return Pointer to Variable Data.
407
408 **/
409 UINT8 *
410 GetVariableDataPtr (
411 IN VARIABLE_HEADER *Variable
412 )
413 {
414 UINTN Value;
415
416 //
417 // Be careful about pad size for alignment.
418 //
419 Value = (UINTN) GetVariableNamePtr (Variable);
420 Value += NameSizeOfVariable (Variable);
421 Value += GET_PAD_SIZE (NameSizeOfVariable (Variable));
422
423 return (UINT8 *) Value;
424 }
425
426
427 /**
428
429 This code gets the pointer to the next variable header.
430
431 @param Variable Pointer to the Variable Header.
432
433 @return Pointer to next variable header.
434
435 **/
436 VARIABLE_HEADER *
437 GetNextVariablePtr (
438 IN VARIABLE_HEADER *Variable
439 )
440 {
441 UINTN Value;
442
443 if (!IsValidVariableHeader (Variable)) {
444 return NULL;
445 }
446
447 Value = (UINTN) GetVariableDataPtr (Variable);
448 Value += DataSizeOfVariable (Variable);
449 Value += GET_PAD_SIZE (DataSizeOfVariable (Variable));
450
451 //
452 // Be careful about pad size for alignment.
453 //
454 return (VARIABLE_HEADER *) HEADER_ALIGN (Value);
455 }
456
457 /**
458
459 Gets the pointer to the first variable header in given variable store area.
460
461 @param VarStoreHeader Pointer to the Variable Store Header.
462
463 @return Pointer to the first variable header.
464
465 **/
466 VARIABLE_HEADER *
467 GetStartPointer (
468 IN VARIABLE_STORE_HEADER *VarStoreHeader
469 )
470 {
471 //
472 // The end of variable store.
473 //
474 return (VARIABLE_HEADER *) HEADER_ALIGN (VarStoreHeader + 1);
475 }
476
477 /**
478
479 Gets the pointer to the end of the variable storage area.
480
481 This function gets pointer to the end of the variable storage
482 area, according to the input variable store header.
483
484 @param VarStoreHeader Pointer to the Variable Store Header.
485
486 @return Pointer to the end of the variable storage area.
487
488 **/
489 VARIABLE_HEADER *
490 GetEndPointer (
491 IN VARIABLE_STORE_HEADER *VarStoreHeader
492 )
493 {
494 //
495 // The end of variable store
496 //
497 return (VARIABLE_HEADER *) HEADER_ALIGN ((UINTN) VarStoreHeader + VarStoreHeader->Size);
498 }
499
500
501 /**
502
503 Variable store garbage collection and reclaim operation.
504
505 @param VariableBase Base address of variable store.
506 @param LastVariableOffset Offset of last variable.
507 @param IsVolatile The variable store is volatile or not;
508 if it is non-volatile, need FTW.
509 @param UpdatingVariable Pointer to updating variable.
510
511 @return EFI_OUT_OF_RESOURCES
512 @return EFI_SUCCESS
513 @return Others
514
515 **/
516 EFI_STATUS
517 Reclaim (
518 IN EFI_PHYSICAL_ADDRESS VariableBase,
519 OUT UINTN *LastVariableOffset,
520 IN BOOLEAN IsVolatile,
521 IN VARIABLE_HEADER *UpdatingVariable
522 )
523 {
524 VARIABLE_HEADER *Variable;
525 VARIABLE_HEADER *AddedVariable;
526 VARIABLE_HEADER *NextVariable;
527 VARIABLE_HEADER *NextAddedVariable;
528 VARIABLE_STORE_HEADER *VariableStoreHeader;
529 UINT8 *ValidBuffer;
530 UINTN MaximumBufferSize;
531 UINTN VariableSize;
532 UINTN VariableNameSize;
533 UINTN UpdatingVariableNameSize;
534 UINTN NameSize;
535 UINT8 *CurrPtr;
536 VOID *Point0;
537 VOID *Point1;
538 BOOLEAN FoundAdded;
539 EFI_STATUS Status;
540 CHAR16 *VariableNamePtr;
541 CHAR16 *UpdatingVariableNamePtr;
542
543 VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) VariableBase);
544 //
545 // Recalculate the total size of Common/HwErr type variables in non-volatile area.
546 //
547 if (!IsVolatile) {
548 mVariableModuleGlobal->CommonVariableTotalSize = 0;
549 mVariableModuleGlobal->HwErrVariableTotalSize = 0;
550 }
551
552 //
553 // Start Pointers for the variable.
554 //
555 Variable = GetStartPointer (VariableStoreHeader);
556 MaximumBufferSize = sizeof (VARIABLE_STORE_HEADER);
557
558 while (IsValidVariableHeader (Variable)) {
559 NextVariable = GetNextVariablePtr (Variable);
560 if (Variable->State == VAR_ADDED ||
561 Variable->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)
562 ) {
563 VariableSize = (UINTN) NextVariable - (UINTN) Variable;
564 MaximumBufferSize += VariableSize;
565 }
566
567 Variable = NextVariable;
568 }
569
570 //
571 // Reserve the 1 Bytes with Oxff to identify the
572 // end of the variable buffer.
573 //
574 MaximumBufferSize += 1;
575 ValidBuffer = AllocatePool (MaximumBufferSize);
576 if (ValidBuffer == NULL) {
577 return EFI_OUT_OF_RESOURCES;
578 }
579
580 SetMem (ValidBuffer, MaximumBufferSize, 0xff);
581
582 //
583 // Copy variable store header.
584 //
585 CopyMem (ValidBuffer, VariableStoreHeader, sizeof (VARIABLE_STORE_HEADER));
586 CurrPtr = (UINT8 *) GetStartPointer ((VARIABLE_STORE_HEADER *) ValidBuffer);
587
588 //
589 // Reinstall all ADDED variables as long as they are not identical to Updating Variable.
590 //
591 Variable = GetStartPointer (VariableStoreHeader);
592 while (IsValidVariableHeader (Variable)) {
593 NextVariable = GetNextVariablePtr (Variable);
594 if (Variable->State == VAR_ADDED) {
595 if (UpdatingVariable != NULL) {
596 if (UpdatingVariable == Variable) {
597 Variable = NextVariable;
598 continue;
599 }
600
601 VariableNameSize = NameSizeOfVariable(Variable);
602 UpdatingVariableNameSize = NameSizeOfVariable(UpdatingVariable);
603
604 VariableNamePtr = GetVariableNamePtr (Variable);
605 UpdatingVariableNamePtr = GetVariableNamePtr (UpdatingVariable);
606 if (CompareGuid (&Variable->VendorGuid, &UpdatingVariable->VendorGuid) &&
607 VariableNameSize == UpdatingVariableNameSize &&
608 CompareMem (VariableNamePtr, UpdatingVariableNamePtr, VariableNameSize) == 0 ) {
609 Variable = NextVariable;
610 continue;
611 }
612 }
613 VariableSize = (UINTN) NextVariable - (UINTN) Variable;
614 CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
615 CurrPtr += VariableSize;
616 if ((!IsVolatile) && ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
617 mVariableModuleGlobal->HwErrVariableTotalSize += VariableSize;
618 } else if ((!IsVolatile) && ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
619 mVariableModuleGlobal->CommonVariableTotalSize += VariableSize;
620 }
621 }
622 Variable = NextVariable;
623 }
624
625 //
626 // Reinstall the variable being updated if it is not NULL.
627 //
628 if (UpdatingVariable != NULL) {
629 VariableSize = (UINTN)(GetNextVariablePtr (UpdatingVariable)) - (UINTN)UpdatingVariable;
630 CopyMem (CurrPtr, (UINT8 *) UpdatingVariable, VariableSize);
631 CurrPtr += VariableSize;
632 if ((!IsVolatile) && ((UpdatingVariable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
633 mVariableModuleGlobal->HwErrVariableTotalSize += VariableSize;
634 } else if ((!IsVolatile) && ((UpdatingVariable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
635 mVariableModuleGlobal->CommonVariableTotalSize += VariableSize;
636 }
637 }
638
639 //
640 // Reinstall all in delete transition variables.
641 //
642 Variable = GetStartPointer (VariableStoreHeader);
643 while (IsValidVariableHeader (Variable)) {
644 NextVariable = GetNextVariablePtr (Variable);
645 if (Variable != UpdatingVariable && Variable->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
646
647 //
648 // Buffer has cached all ADDED variable.
649 // Per IN_DELETED variable, we have to guarantee that
650 // no ADDED one in previous buffer.
651 //
652
653 FoundAdded = FALSE;
654 AddedVariable = GetStartPointer ((VARIABLE_STORE_HEADER *) ValidBuffer);
655 while (IsValidVariableHeader (AddedVariable)) {
656 NextAddedVariable = GetNextVariablePtr (AddedVariable);
657 NameSize = NameSizeOfVariable (AddedVariable);
658 if (CompareGuid (&AddedVariable->VendorGuid, &Variable->VendorGuid) &&
659 NameSize == NameSizeOfVariable (Variable)
660 ) {
661 Point0 = (VOID *) GetVariableNamePtr (AddedVariable);
662 Point1 = (VOID *) GetVariableNamePtr (Variable);
663 if (CompareMem (Point0, Point1, NameSizeOfVariable (AddedVariable)) == 0) {
664 FoundAdded = TRUE;
665 break;
666 }
667 }
668 AddedVariable = NextAddedVariable;
669 }
670 if (!FoundAdded) {
671 //
672 // Promote VAR_IN_DELETED_TRANSITION to VAR_ADDED.
673 //
674 VariableSize = (UINTN) NextVariable - (UINTN) Variable;
675 CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
676 ((VARIABLE_HEADER *) CurrPtr)->State = VAR_ADDED;
677 CurrPtr += VariableSize;
678 if ((!IsVolatile) && ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
679 mVariableModuleGlobal->HwErrVariableTotalSize += VariableSize;
680 } else if ((!IsVolatile) && ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
681 mVariableModuleGlobal->CommonVariableTotalSize += VariableSize;
682 }
683 }
684 }
685
686 Variable = NextVariable;
687 }
688
689 if (IsVolatile) {
690 //
691 // If volatile variable store, just copy valid buffer.
692 //
693 SetMem ((UINT8 *) (UINTN) VariableBase, VariableStoreHeader->Size, 0xff);
694 CopyMem ((UINT8 *) (UINTN) VariableBase, ValidBuffer, (UINTN) (CurrPtr - (UINT8 *) ValidBuffer));
695 Status = EFI_SUCCESS;
696 } else {
697 //
698 // If non-volatile variable store, perform FTW here.
699 //
700 Status = FtwVariableSpace (
701 VariableBase,
702 ValidBuffer,
703 (UINTN) (CurrPtr - (UINT8 *) ValidBuffer)
704 );
705 CopyMem (mNvVariableCache, (CHAR8 *)(UINTN)VariableBase, VariableStoreHeader->Size);
706 }
707 if (!EFI_ERROR (Status)) {
708 *LastVariableOffset = (UINTN) (CurrPtr - (UINT8 *) ValidBuffer);
709 } else {
710 *LastVariableOffset = 0;
711 }
712
713 FreePool (ValidBuffer);
714
715 return Status;
716 }
717
718 /**
719 Find the variable in the specified variable store.
720
721 @param VariableName Name of the variable to be found
722 @param VendorGuid Vendor GUID to be found.
723 @param PtrTrack Variable Track Pointer structure that contains Variable Information.
724
725 @retval EFI_SUCCESS Variable found successfully
726 @retval EFI_NOT_FOUND Variable not found
727 **/
728 EFI_STATUS
729 FindVariableEx (
730 IN CHAR16 *VariableName,
731 IN EFI_GUID *VendorGuid,
732 IN OUT VARIABLE_POINTER_TRACK *PtrTrack
733 )
734 {
735 VARIABLE_HEADER *InDeletedVariable;
736 VOID *Point;
737
738 //
739 // Find the variable by walk through HOB, volatile and non-volatile variable store.
740 //
741 InDeletedVariable = NULL;
742
743 for ( PtrTrack->CurrPtr = PtrTrack->StartPtr
744 ; (PtrTrack->CurrPtr < PtrTrack->EndPtr) && IsValidVariableHeader (PtrTrack->CurrPtr)
745 ; PtrTrack->CurrPtr = GetNextVariablePtr (PtrTrack->CurrPtr)
746 ) {
747 if (PtrTrack->CurrPtr->State == VAR_ADDED ||
748 PtrTrack->CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)
749 ) {
750 if (!AtRuntime () || ((PtrTrack->CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) != 0)) {
751 if (VariableName[0] == 0) {
752 if (PtrTrack->CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
753 InDeletedVariable = PtrTrack->CurrPtr;
754 } else {
755 return EFI_SUCCESS;
756 }
757 } else {
758 if (CompareGuid (VendorGuid, &PtrTrack->CurrPtr->VendorGuid)) {
759 Point = (VOID *) GetVariableNamePtr (PtrTrack->CurrPtr);
760
761 ASSERT (NameSizeOfVariable (PtrTrack->CurrPtr) != 0);
762 if (CompareMem (VariableName, Point, NameSizeOfVariable (PtrTrack->CurrPtr)) == 0) {
763 if (PtrTrack->CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
764 InDeletedVariable = PtrTrack->CurrPtr;
765 } else {
766 return EFI_SUCCESS;
767 }
768 }
769 }
770 }
771 }
772 }
773 }
774
775 PtrTrack->CurrPtr = InDeletedVariable;
776 return (PtrTrack->CurrPtr == NULL) ? EFI_NOT_FOUND : EFI_SUCCESS;
777 }
778
779
780 /**
781 Finds variable in storage blocks of volatile and non-volatile storage areas.
782
783 This code finds variable in storage blocks of volatile and non-volatile storage areas.
784 If VariableName is an empty string, then we just return the first
785 qualified variable without comparing VariableName and VendorGuid.
786 Otherwise, VariableName and VendorGuid are compared.
787
788 @param VariableName Name of the variable to be found.
789 @param VendorGuid Vendor GUID to be found.
790 @param PtrTrack VARIABLE_POINTER_TRACK structure for output,
791 including the range searched and the target position.
792 @param Global Pointer to VARIABLE_GLOBAL structure, including
793 base of volatile variable storage area, base of
794 NV variable storage area, and a lock.
795
796 @retval EFI_INVALID_PARAMETER If VariableName is not an empty string, while
797 VendorGuid is NULL.
798 @retval EFI_SUCCESS Variable successfully found.
799 @retval EFI_NOT_FOUND Variable not found
800
801 **/
802 EFI_STATUS
803 FindVariable (
804 IN CHAR16 *VariableName,
805 IN EFI_GUID *VendorGuid,
806 OUT VARIABLE_POINTER_TRACK *PtrTrack,
807 IN VARIABLE_GLOBAL *Global
808 )
809 {
810 EFI_STATUS Status;
811 VARIABLE_STORE_HEADER *VariableStoreHeader[VariableStoreTypeMax];
812 VARIABLE_STORE_TYPE Type;
813
814 if (VariableName[0] != 0 && VendorGuid == NULL) {
815 return EFI_INVALID_PARAMETER;
816 }
817
818 //
819 // 0: Volatile, 1: HOB, 2: Non-Volatile.
820 // The index and attributes mapping must be kept in this order as RuntimeServiceGetNextVariableName
821 // make use of this mapping to implement search algorithm.
822 //
823 VariableStoreHeader[VariableStoreTypeVolatile] = (VARIABLE_STORE_HEADER *) (UINTN) Global->VolatileVariableBase;
824 VariableStoreHeader[VariableStoreTypeHob] = (VARIABLE_STORE_HEADER *) (UINTN) Global->HobVariableBase;
825 VariableStoreHeader[VariableStoreTypeNv] = mNvVariableCache;
826
827 //
828 // Find the variable by walk through HOB, volatile and non-volatile variable store.
829 //
830 for (Type = (VARIABLE_STORE_TYPE) 0; Type < VariableStoreTypeMax; Type++) {
831 if (VariableStoreHeader[Type] == NULL) {
832 continue;
833 }
834
835 PtrTrack->StartPtr = GetStartPointer (VariableStoreHeader[Type]);
836 PtrTrack->EndPtr = GetEndPointer (VariableStoreHeader[Type]);
837 PtrTrack->Volatile = (BOOLEAN) (Type == VariableStoreTypeVolatile);
838
839 Status = FindVariableEx (VariableName, VendorGuid, PtrTrack);
840 if (!EFI_ERROR (Status)) {
841 return Status;
842 }
843 }
844 return EFI_NOT_FOUND;
845 }
846
847 /**
848 Get index from supported language codes according to language string.
849
850 This code is used to get corresponding index in supported language codes. It can handle
851 RFC4646 and ISO639 language tags.
852 In ISO639 language tags, take 3-characters as a delimitation to find matched string and calculate the index.
853 In RFC4646 language tags, take semicolon as a delimitation to find matched string and calculate the index.
854
855 For example:
856 SupportedLang = "engfraengfra"
857 Lang = "eng"
858 Iso639Language = TRUE
859 The return value is "0".
860 Another example:
861 SupportedLang = "en;fr;en-US;fr-FR"
862 Lang = "fr-FR"
863 Iso639Language = FALSE
864 The return value is "3".
865
866 @param SupportedLang Platform supported language codes.
867 @param Lang Configured language.
868 @param Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646.
869
870 @retval The index of language in the language codes.
871
872 **/
873 UINTN
874 GetIndexFromSupportedLangCodes(
875 IN CHAR8 *SupportedLang,
876 IN CHAR8 *Lang,
877 IN BOOLEAN Iso639Language
878 )
879 {
880 UINTN Index;
881 UINTN CompareLength;
882 UINTN LanguageLength;
883
884 if (Iso639Language) {
885 CompareLength = ISO_639_2_ENTRY_SIZE;
886 for (Index = 0; Index < AsciiStrLen (SupportedLang); Index += CompareLength) {
887 if (AsciiStrnCmp (Lang, SupportedLang + Index, CompareLength) == 0) {
888 //
889 // Successfully find the index of Lang string in SupportedLang string.
890 //
891 Index = Index / CompareLength;
892 return Index;
893 }
894 }
895 ASSERT (FALSE);
896 return 0;
897 } else {
898 //
899 // Compare RFC4646 language code
900 //
901 Index = 0;
902 for (LanguageLength = 0; Lang[LanguageLength] != '\0'; LanguageLength++);
903
904 for (Index = 0; *SupportedLang != '\0'; Index++, SupportedLang += CompareLength) {
905 //
906 // Skip ';' characters in SupportedLang
907 //
908 for (; *SupportedLang != '\0' && *SupportedLang == ';'; SupportedLang++);
909 //
910 // Determine the length of the next language code in SupportedLang
911 //
912 for (CompareLength = 0; SupportedLang[CompareLength] != '\0' && SupportedLang[CompareLength] != ';'; CompareLength++);
913
914 if ((CompareLength == LanguageLength) &&
915 (AsciiStrnCmp (Lang, SupportedLang, CompareLength) == 0)) {
916 //
917 // Successfully find the index of Lang string in SupportedLang string.
918 //
919 return Index;
920 }
921 }
922 ASSERT (FALSE);
923 return 0;
924 }
925 }
926
927 /**
928 Get language string from supported language codes according to index.
929
930 This code is used to get corresponding language strings in supported language codes. It can handle
931 RFC4646 and ISO639 language tags.
932 In ISO639 language tags, take 3-characters as a delimitation. Find language string according to the index.
933 In RFC4646 language tags, take semicolon as a delimitation. Find language string according to the index.
934
935 For example:
936 SupportedLang = "engfraengfra"
937 Index = "1"
938 Iso639Language = TRUE
939 The return value is "fra".
940 Another example:
941 SupportedLang = "en;fr;en-US;fr-FR"
942 Index = "1"
943 Iso639Language = FALSE
944 The return value is "fr".
945
946 @param SupportedLang Platform supported language codes.
947 @param Index The index in supported language codes.
948 @param Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646.
949
950 @retval The language string in the language codes.
951
952 **/
953 CHAR8 *
954 GetLangFromSupportedLangCodes (
955 IN CHAR8 *SupportedLang,
956 IN UINTN Index,
957 IN BOOLEAN Iso639Language
958 )
959 {
960 UINTN SubIndex;
961 UINTN CompareLength;
962 CHAR8 *Supported;
963
964 SubIndex = 0;
965 Supported = SupportedLang;
966 if (Iso639Language) {
967 //
968 // According to the index of Lang string in SupportedLang string to get the language.
969 // This code will be invoked in RUNTIME, therefore there is not a memory allocate/free operation.
970 // In driver entry, it pre-allocates a runtime attribute memory to accommodate this string.
971 //
972 CompareLength = ISO_639_2_ENTRY_SIZE;
973 mVariableModuleGlobal->Lang[CompareLength] = '\0';
974 return CopyMem (mVariableModuleGlobal->Lang, SupportedLang + Index * CompareLength, CompareLength);
975
976 } else {
977 while (TRUE) {
978 //
979 // Take semicolon as delimitation, sequentially traverse supported language codes.
980 //
981 for (CompareLength = 0; *Supported != ';' && *Supported != '\0'; CompareLength++) {
982 Supported++;
983 }
984 if ((*Supported == '\0') && (SubIndex != Index)) {
985 //
986 // Have completed the traverse, but not find corrsponding string.
987 // This case is not allowed to happen.
988 //
989 ASSERT(FALSE);
990 return NULL;
991 }
992 if (SubIndex == Index) {
993 //
994 // According to the index of Lang string in SupportedLang string to get the language.
995 // As this code will be invoked in RUNTIME, therefore there is not memory allocate/free operation.
996 // In driver entry, it pre-allocates a runtime attribute memory to accommodate this string.
997 //
998 mVariableModuleGlobal->PlatformLang[CompareLength] = '\0';
999 return CopyMem (mVariableModuleGlobal->PlatformLang, Supported - CompareLength, CompareLength);
1000 }
1001 SubIndex++;
1002
1003 //
1004 // Skip ';' characters in Supported
1005 //
1006 for (; *Supported != '\0' && *Supported == ';'; Supported++);
1007 }
1008 }
1009 }
1010
1011 /**
1012 Returns a pointer to an allocated buffer that contains the best matching language
1013 from a set of supported languages.
1014
1015 This function supports both ISO 639-2 and RFC 4646 language codes, but language
1016 code types may not be mixed in a single call to this function. This function
1017 supports a variable argument list that allows the caller to pass in a prioritized
1018 list of language codes to test against all the language codes in SupportedLanguages.
1019
1020 If SupportedLanguages is NULL, then ASSERT().
1021
1022 @param[in] SupportedLanguages A pointer to a Null-terminated ASCII string that
1023 contains a set of language codes in the format
1024 specified by Iso639Language.
1025 @param[in] Iso639Language If TRUE, then all language codes are assumed to be
1026 in ISO 639-2 format. If FALSE, then all language
1027 codes are assumed to be in RFC 4646 language format
1028 @param[in] ... A variable argument list that contains pointers to
1029 Null-terminated ASCII strings that contain one or more
1030 language codes in the format specified by Iso639Language.
1031 The first language code from each of these language
1032 code lists is used to determine if it is an exact or
1033 close match to any of the language codes in
1034 SupportedLanguages. Close matches only apply to RFC 4646
1035 language codes, and the matching algorithm from RFC 4647
1036 is used to determine if a close match is present. If
1037 an exact or close match is found, then the matching
1038 language code from SupportedLanguages is returned. If
1039 no matches are found, then the next variable argument
1040 parameter is evaluated. The variable argument list
1041 is terminated by a NULL.
1042
1043 @retval NULL The best matching language could not be found in SupportedLanguages.
1044 @retval NULL There are not enough resources available to return the best matching
1045 language.
1046 @retval Other A pointer to a Null-terminated ASCII string that is the best matching
1047 language in SupportedLanguages.
1048
1049 **/
1050 CHAR8 *
1051 EFIAPI
1052 VariableGetBestLanguage (
1053 IN CONST CHAR8 *SupportedLanguages,
1054 IN BOOLEAN Iso639Language,
1055 ...
1056 )
1057 {
1058 VA_LIST Args;
1059 CHAR8 *Language;
1060 UINTN CompareLength;
1061 UINTN LanguageLength;
1062 CONST CHAR8 *Supported;
1063 CHAR8 *Buffer;
1064
1065 if (SupportedLanguages == NULL) {
1066 return NULL;
1067 }
1068
1069 VA_START (Args, Iso639Language);
1070 while ((Language = VA_ARG (Args, CHAR8 *)) != NULL) {
1071 //
1072 // Default to ISO 639-2 mode
1073 //
1074 CompareLength = 3;
1075 LanguageLength = MIN (3, AsciiStrLen (Language));
1076
1077 //
1078 // If in RFC 4646 mode, then determine the length of the first RFC 4646 language code in Language
1079 //
1080 if (!Iso639Language) {
1081 for (LanguageLength = 0; Language[LanguageLength] != 0 && Language[LanguageLength] != ';'; LanguageLength++);
1082 }
1083
1084 //
1085 // Trim back the length of Language used until it is empty
1086 //
1087 while (LanguageLength > 0) {
1088 //
1089 // Loop through all language codes in SupportedLanguages
1090 //
1091 for (Supported = SupportedLanguages; *Supported != '\0'; Supported += CompareLength) {
1092 //
1093 // In RFC 4646 mode, then Loop through all language codes in SupportedLanguages
1094 //
1095 if (!Iso639Language) {
1096 //
1097 // Skip ';' characters in Supported
1098 //
1099 for (; *Supported != '\0' && *Supported == ';'; Supported++);
1100 //
1101 // Determine the length of the next language code in Supported
1102 //
1103 for (CompareLength = 0; Supported[CompareLength] != 0 && Supported[CompareLength] != ';'; CompareLength++);
1104 //
1105 // If Language is longer than the Supported, then skip to the next language
1106 //
1107 if (LanguageLength > CompareLength) {
1108 continue;
1109 }
1110 }
1111 //
1112 // See if the first LanguageLength characters in Supported match Language
1113 //
1114 if (AsciiStrnCmp (Supported, Language, LanguageLength) == 0) {
1115 VA_END (Args);
1116
1117 Buffer = Iso639Language ? mVariableModuleGlobal->Lang : mVariableModuleGlobal->PlatformLang;
1118 Buffer[CompareLength] = '\0';
1119 return CopyMem (Buffer, Supported, CompareLength);
1120 }
1121 }
1122
1123 if (Iso639Language) {
1124 //
1125 // If ISO 639 mode, then each language can only be tested once
1126 //
1127 LanguageLength = 0;
1128 } else {
1129 //
1130 // If RFC 4646 mode, then trim Language from the right to the next '-' character
1131 //
1132 for (LanguageLength--; LanguageLength > 0 && Language[LanguageLength] != '-'; LanguageLength--);
1133 }
1134 }
1135 }
1136 VA_END (Args);
1137
1138 //
1139 // No matches were found
1140 //
1141 return NULL;
1142 }
1143
1144 /**
1145 Hook the operations in PlatformLangCodes, LangCodes, PlatformLang and Lang.
1146
1147 When setting Lang/LangCodes, simultaneously update PlatformLang/PlatformLangCodes.
1148
1149 According to UEFI spec, PlatformLangCodes/LangCodes are only set once in firmware initialization,
1150 and are read-only. Therefore, in variable driver, only store the original value for other use.
1151
1152 @param[in] VariableName Name of variable.
1153
1154 @param[in] Data Variable data.
1155
1156 @param[in] DataSize Size of data. 0 means delete.
1157
1158 **/
1159 VOID
1160 AutoUpdateLangVariable (
1161 IN CHAR16 *VariableName,
1162 IN VOID *Data,
1163 IN UINTN DataSize
1164 )
1165 {
1166 EFI_STATUS Status;
1167 CHAR8 *BestPlatformLang;
1168 CHAR8 *BestLang;
1169 UINTN Index;
1170 UINT32 Attributes;
1171 VARIABLE_POINTER_TRACK Variable;
1172 BOOLEAN SetLanguageCodes;
1173
1174 //
1175 // Don't do updates for delete operation
1176 //
1177 if (DataSize == 0) {
1178 return;
1179 }
1180
1181 SetLanguageCodes = FALSE;
1182
1183 if (StrCmp (VariableName, L"PlatformLangCodes") == 0) {
1184 //
1185 // PlatformLangCodes is a volatile variable, so it can not be updated at runtime.
1186 //
1187 if (AtRuntime ()) {
1188 return;
1189 }
1190
1191 SetLanguageCodes = TRUE;
1192
1193 //
1194 // According to UEFI spec, PlatformLangCodes is only set once in firmware initialization, and is read-only
1195 // Therefore, in variable driver, only store the original value for other use.
1196 //
1197 if (mVariableModuleGlobal->PlatformLangCodes != NULL) {
1198 FreePool (mVariableModuleGlobal->PlatformLangCodes);
1199 }
1200 mVariableModuleGlobal->PlatformLangCodes = AllocateRuntimeCopyPool (DataSize, Data);
1201 ASSERT (mVariableModuleGlobal->PlatformLangCodes != NULL);
1202
1203 //
1204 // PlatformLang holds a single language from PlatformLangCodes,
1205 // so the size of PlatformLangCodes is enough for the PlatformLang.
1206 //
1207 if (mVariableModuleGlobal->PlatformLang != NULL) {
1208 FreePool (mVariableModuleGlobal->PlatformLang);
1209 }
1210 mVariableModuleGlobal->PlatformLang = AllocateRuntimePool (DataSize);
1211 ASSERT (mVariableModuleGlobal->PlatformLang != NULL);
1212
1213 } else if (StrCmp (VariableName, L"LangCodes") == 0) {
1214 //
1215 // LangCodes is a volatile variable, so it can not be updated at runtime.
1216 //
1217 if (AtRuntime ()) {
1218 return;
1219 }
1220
1221 SetLanguageCodes = TRUE;
1222
1223 //
1224 // According to UEFI spec, LangCodes is only set once in firmware initialization, and is read-only
1225 // Therefore, in variable driver, only store the original value for other use.
1226 //
1227 if (mVariableModuleGlobal->LangCodes != NULL) {
1228 FreePool (mVariableModuleGlobal->LangCodes);
1229 }
1230 mVariableModuleGlobal->LangCodes = AllocateRuntimeCopyPool (DataSize, Data);
1231 ASSERT (mVariableModuleGlobal->LangCodes != NULL);
1232 }
1233
1234 if (SetLanguageCodes
1235 && (mVariableModuleGlobal->PlatformLangCodes != NULL)
1236 && (mVariableModuleGlobal->LangCodes != NULL)) {
1237 //
1238 // Update Lang if PlatformLang is already set
1239 // Update PlatformLang if Lang is already set
1240 //
1241 Status = FindVariable (L"PlatformLang", &gEfiGlobalVariableGuid, &Variable, &mVariableModuleGlobal->VariableGlobal);
1242 if (!EFI_ERROR (Status)) {
1243 //
1244 // Update Lang
1245 //
1246 VariableName = L"PlatformLang";
1247 Data = GetVariableDataPtr (Variable.CurrPtr);
1248 DataSize = Variable.CurrPtr->DataSize;
1249 } else {
1250 Status = FindVariable (L"Lang", &gEfiGlobalVariableGuid, &Variable, &mVariableModuleGlobal->VariableGlobal);
1251 if (!EFI_ERROR (Status)) {
1252 //
1253 // Update PlatformLang
1254 //
1255 VariableName = L"Lang";
1256 Data = GetVariableDataPtr (Variable.CurrPtr);
1257 DataSize = Variable.CurrPtr->DataSize;
1258 } else {
1259 //
1260 // Neither PlatformLang nor Lang is set, directly return
1261 //
1262 return;
1263 }
1264 }
1265 }
1266
1267 //
1268 // According to UEFI spec, "Lang" and "PlatformLang" is NV|BS|RT attributions.
1269 //
1270 Attributes = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
1271
1272 if (StrCmp (VariableName, L"PlatformLang") == 0) {
1273 //
1274 // Update Lang when PlatformLangCodes/LangCodes were set.
1275 //
1276 if ((mVariableModuleGlobal->PlatformLangCodes != NULL) && (mVariableModuleGlobal->LangCodes != NULL)) {
1277 //
1278 // When setting PlatformLang, firstly get most matched language string from supported language codes.
1279 //
1280 BestPlatformLang = VariableGetBestLanguage (mVariableModuleGlobal->PlatformLangCodes, FALSE, Data, NULL);
1281 if (BestPlatformLang != NULL) {
1282 //
1283 // Get the corresponding index in language codes.
1284 //
1285 Index = GetIndexFromSupportedLangCodes (mVariableModuleGlobal->PlatformLangCodes, BestPlatformLang, FALSE);
1286
1287 //
1288 // Get the corresponding ISO639 language tag according to RFC4646 language tag.
1289 //
1290 BestLang = GetLangFromSupportedLangCodes (mVariableModuleGlobal->LangCodes, Index, TRUE);
1291
1292 //
1293 // Successfully convert PlatformLang to Lang, and set the BestLang value into Lang variable simultaneously.
1294 //
1295 FindVariable (L"Lang", &gEfiGlobalVariableGuid, &Variable, &mVariableModuleGlobal->VariableGlobal);
1296
1297 Status = UpdateVariable (L"Lang", &gEfiGlobalVariableGuid, BestLang,
1298 ISO_639_2_ENTRY_SIZE + 1, Attributes, 0, 0, &Variable, NULL);
1299
1300 DEBUG ((EFI_D_INFO, "Variable Driver Auto Update PlatformLang, PlatformLang:%a, Lang:%a\n", BestPlatformLang, BestLang));
1301
1302 ASSERT_EFI_ERROR(Status);
1303 }
1304 }
1305
1306 } else if (StrCmp (VariableName, L"Lang") == 0) {
1307 //
1308 // Update PlatformLang when PlatformLangCodes/LangCodes were set.
1309 //
1310 if ((mVariableModuleGlobal->PlatformLangCodes != NULL) && (mVariableModuleGlobal->LangCodes != NULL)) {
1311 //
1312 // When setting Lang, firstly get most matched language string from supported language codes.
1313 //
1314 BestLang = VariableGetBestLanguage (mVariableModuleGlobal->LangCodes, TRUE, Data, NULL);
1315 if (BestLang != NULL) {
1316 //
1317 // Get the corresponding index in language codes.
1318 //
1319 Index = GetIndexFromSupportedLangCodes (mVariableModuleGlobal->LangCodes, BestLang, TRUE);
1320
1321 //
1322 // Get the corresponding RFC4646 language tag according to ISO639 language tag.
1323 //
1324 BestPlatformLang = GetLangFromSupportedLangCodes (mVariableModuleGlobal->PlatformLangCodes, Index, FALSE);
1325
1326 //
1327 // Successfully convert Lang to PlatformLang, and set the BestPlatformLang value into PlatformLang variable simultaneously.
1328 //
1329 FindVariable (L"PlatformLang", &gEfiGlobalVariableGuid, &Variable, &mVariableModuleGlobal->VariableGlobal);
1330
1331 Status = UpdateVariable (L"PlatformLang", &gEfiGlobalVariableGuid, BestPlatformLang,
1332 AsciiStrSize (BestPlatformLang), Attributes, 0, 0, &Variable, NULL);
1333
1334 DEBUG ((EFI_D_INFO, "Variable Driver Auto Update Lang, Lang:%a, PlatformLang:%a\n", BestLang, BestPlatformLang));
1335 ASSERT_EFI_ERROR (Status);
1336 }
1337 }
1338 }
1339 }
1340
1341 /**
1342 Update the variable region with Variable information. If EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS is set,
1343 index of associated public key is needed.
1344
1345 @param[in] VariableName Name of variable.
1346 @param[in] VendorGuid Guid of variable.
1347 @param[in] Data Variable data.
1348 @param[in] DataSize Size of data. 0 means delete.
1349 @param[in] Attributes Attributes of the variable.
1350 @param[in] KeyIndex Index of associated public key.
1351 @param[in] MonotonicCount Value of associated monotonic count.
1352 @param[in] CacheVariable The variable information which is used to keep track of variable usage.
1353 @param[in] TimeStamp Value of associated TimeStamp.
1354
1355 @retval EFI_SUCCESS The update operation is success.
1356 @retval EFI_OUT_OF_RESOURCES Variable region is full, can not write other data into this region.
1357
1358 **/
1359 EFI_STATUS
1360 UpdateVariable (
1361 IN CHAR16 *VariableName,
1362 IN EFI_GUID *VendorGuid,
1363 IN VOID *Data,
1364 IN UINTN DataSize,
1365 IN UINT32 Attributes OPTIONAL,
1366 IN UINT32 KeyIndex OPTIONAL,
1367 IN UINT64 MonotonicCount OPTIONAL,
1368 IN VARIABLE_POINTER_TRACK *CacheVariable,
1369 IN EFI_TIME *TimeStamp OPTIONAL
1370 )
1371 {
1372 EFI_STATUS Status;
1373 VARIABLE_HEADER *NextVariable;
1374 UINTN ScratchSize;
1375 UINTN ScratchDataSize;
1376 UINTN NonVolatileVarableStoreSize;
1377 UINTN VarNameOffset;
1378 UINTN VarDataOffset;
1379 UINTN VarNameSize;
1380 UINTN VarSize;
1381 BOOLEAN Volatile;
1382 EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
1383 UINT8 State;
1384 BOOLEAN Reclaimed;
1385 VARIABLE_POINTER_TRACK *Variable;
1386 VARIABLE_POINTER_TRACK NvVariable;
1387 VARIABLE_STORE_HEADER *VariableStoreHeader;
1388 UINTN CacheOffset;
1389 UINTN BufSize;
1390 UINTN DataOffset;
1391 UINTN RevBufSize;
1392
1393 if (mVariableModuleGlobal->FvbInstance == NULL) {
1394 //
1395 // The FVB protocol is not installed, so the EFI_VARIABLE_WRITE_ARCH_PROTOCOL is not installed.
1396 //
1397 if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
1398 //
1399 // Trying to update NV variable prior to the installation of EFI_VARIABLE_WRITE_ARCH_PROTOCOL
1400 //
1401 return EFI_NOT_AVAILABLE_YET;
1402 } else if ((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) != 0) {
1403 //
1404 // Trying to update volatile authenticated variable prior to the installation of EFI_VARIABLE_WRITE_ARCH_PROTOCOL
1405 // The authenticated variable perhaps is not initialized, just return here.
1406 //
1407 return EFI_NOT_AVAILABLE_YET;
1408 }
1409 }
1410
1411 if ((CacheVariable->CurrPtr == NULL) || CacheVariable->Volatile) {
1412 Variable = CacheVariable;
1413 } else {
1414 //
1415 // Update/Delete existing NV variable.
1416 // CacheVariable points to the variable in the memory copy of Flash area
1417 // Now let Variable points to the same variable in Flash area.
1418 //
1419 VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase);
1420 Variable = &NvVariable;
1421 Variable->StartPtr = GetStartPointer (VariableStoreHeader);
1422 Variable->EndPtr = GetEndPointer (VariableStoreHeader);
1423 Variable->CurrPtr = (VARIABLE_HEADER *)((UINTN)Variable->StartPtr + ((UINTN)CacheVariable->CurrPtr - (UINTN)CacheVariable->StartPtr));
1424 Variable->Volatile = FALSE;
1425 }
1426
1427 Fvb = mVariableModuleGlobal->FvbInstance;
1428 Reclaimed = FALSE;
1429
1430 //
1431 // Tricky part: Use scratch data area at the end of volatile variable store
1432 // as a temporary storage.
1433 //
1434 NextVariable = GetEndPointer ((VARIABLE_STORE_HEADER *) ((UINTN) mVariableModuleGlobal->VariableGlobal.VolatileVariableBase));
1435 ScratchSize = MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize));
1436 ScratchDataSize = ScratchSize - sizeof (VARIABLE_HEADER) - StrSize (VariableName) - GET_PAD_SIZE (StrSize (VariableName));
1437
1438 if (Variable->CurrPtr != NULL) {
1439 //
1440 // Update/Delete existing variable.
1441 //
1442 if (AtRuntime ()) {
1443 //
1444 // If AtRuntime and the variable is Volatile and Runtime Access,
1445 // the volatile is ReadOnly, and SetVariable should be aborted and
1446 // return EFI_WRITE_PROTECTED.
1447 //
1448 if (Variable->Volatile) {
1449 Status = EFI_WRITE_PROTECTED;
1450 goto Done;
1451 }
1452 //
1453 // Only variable that have NV attributes can be updated/deleted in Runtime.
1454 //
1455 if ((Variable->CurrPtr->Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
1456 Status = EFI_INVALID_PARAMETER;
1457 goto Done;
1458 }
1459 }
1460
1461 //
1462 // Setting a data variable with no access, or zero DataSize attributes
1463 // causes it to be deleted.
1464 // When the EFI_VARIABLE_APPEND_WRITE attribute is set, DataSize of zero will
1465 // not delete the variable.
1466 //
1467 if ((((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) && (DataSize == 0))|| ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0)) {
1468 State = Variable->CurrPtr->State;
1469 State &= VAR_DELETED;
1470
1471 Status = UpdateVariableStore (
1472 &mVariableModuleGlobal->VariableGlobal,
1473 Variable->Volatile,
1474 FALSE,
1475 Fvb,
1476 (UINTN) &Variable->CurrPtr->State,
1477 sizeof (UINT8),
1478 &State
1479 );
1480 if (!EFI_ERROR (Status)) {
1481 UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, FALSE, TRUE, FALSE);
1482 if (!Variable->Volatile) {
1483 CacheVariable->CurrPtr->State = State;
1484 }
1485 }
1486 goto Done;
1487 }
1488 //
1489 // If the variable is marked valid, and the same data has been passed in,
1490 // then return to the caller immediately.
1491 //
1492 if (DataSizeOfVariable (Variable->CurrPtr) == DataSize &&
1493 (CompareMem (Data, GetVariableDataPtr (Variable->CurrPtr), DataSize) == 0) &&
1494 ((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) &&
1495 (TimeStamp == NULL)) {
1496 //
1497 // Variable content unchanged and no need to update timestamp, just return.
1498 //
1499 UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, TRUE, FALSE, FALSE);
1500 Status = EFI_SUCCESS;
1501 goto Done;
1502 } else if ((Variable->CurrPtr->State == VAR_ADDED) ||
1503 (Variable->CurrPtr->State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION))) {
1504
1505 //
1506 // EFI_VARIABLE_APPEND_WRITE attribute only effects for existing variable
1507 //
1508 if ((Attributes & EFI_VARIABLE_APPEND_WRITE) != 0) {
1509 //
1510 // Cache the previous variable data into StorageArea.
1511 //
1512 DataOffset = sizeof (VARIABLE_HEADER) + Variable->CurrPtr->NameSize + GET_PAD_SIZE (Variable->CurrPtr->NameSize);
1513 CopyMem (mStorageArea, (UINT8*)((UINTN) Variable->CurrPtr + DataOffset), Variable->CurrPtr->DataSize);
1514
1515 if (CompareGuid (VendorGuid, &gEfiImageSecurityDatabaseGuid) ||
1516 (CompareGuid (VendorGuid, &gEfiGlobalVariableGuid) && (StrCmp (VariableName, EFI_KEY_EXCHANGE_KEY_NAME) == 0))) {
1517 //
1518 // For variables with the GUID EFI_IMAGE_SECURITY_DATABASE_GUID (i.e. where the data
1519 // buffer is formatted as EFI_SIGNATURE_LIST), the driver shall not perform an append of
1520 // EFI_SIGNATURE_DATA values that are already part of the existing variable value.
1521 //
1522 BufSize = AppendSignatureList (mStorageArea, Variable->CurrPtr->DataSize, Data, DataSize);
1523 if (BufSize == Variable->CurrPtr->DataSize) {
1524 if ((TimeStamp == NULL) || CompareTimeStamp (TimeStamp, &Variable->CurrPtr->TimeStamp)) {
1525 //
1526 // New EFI_SIGNATURE_DATA is not found and timestamp is not later
1527 // than current timestamp, return EFI_SUCCESS directly.
1528 //
1529 UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, TRUE, FALSE, FALSE);
1530 Status = EFI_SUCCESS;
1531 goto Done;
1532 }
1533 }
1534 } else {
1535 //
1536 // For other Variables, append the new data to the end of previous data.
1537 //
1538 CopyMem ((UINT8*)((UINTN) mStorageArea + Variable->CurrPtr->DataSize), Data, DataSize);
1539 BufSize = Variable->CurrPtr->DataSize + DataSize;
1540 }
1541
1542 RevBufSize = MIN (PcdGet32 (PcdMaxVariableSize), ScratchDataSize);
1543 if (BufSize > RevBufSize) {
1544 //
1545 // If variable size (previous + current) is bigger than reserved buffer in runtime,
1546 // return EFI_OUT_OF_RESOURCES.
1547 //
1548 return EFI_OUT_OF_RESOURCES;
1549 }
1550
1551 //
1552 // Override Data and DataSize which are used for combined data area including previous and new data.
1553 //
1554 Data = mStorageArea;
1555 DataSize = BufSize;
1556 }
1557
1558 //
1559 // Mark the old variable as in delete transition.
1560 //
1561 State = Variable->CurrPtr->State;
1562 State &= VAR_IN_DELETED_TRANSITION;
1563
1564 Status = UpdateVariableStore (
1565 &mVariableModuleGlobal->VariableGlobal,
1566 Variable->Volatile,
1567 FALSE,
1568 Fvb,
1569 (UINTN) &Variable->CurrPtr->State,
1570 sizeof (UINT8),
1571 &State
1572 );
1573 if (EFI_ERROR (Status)) {
1574 goto Done;
1575 }
1576 if (!Variable->Volatile) {
1577 CacheVariable->CurrPtr->State = State;
1578 }
1579 }
1580 } else {
1581 //
1582 // Not found existing variable. Create a new variable.
1583 //
1584
1585 if ((DataSize == 0) && ((Attributes & EFI_VARIABLE_APPEND_WRITE) != 0)) {
1586 Status = EFI_SUCCESS;
1587 goto Done;
1588 }
1589
1590 //
1591 // Make sure we are trying to create a new variable.
1592 // Setting a data variable with zero DataSize or no access attributes means to delete it.
1593 //
1594 if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
1595 Status = EFI_NOT_FOUND;
1596 goto Done;
1597 }
1598
1599 //
1600 // Only variable have NV|RT attribute can be created in Runtime.
1601 //
1602 if (AtRuntime () &&
1603 (((Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0) || ((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0))) {
1604 Status = EFI_INVALID_PARAMETER;
1605 goto Done;
1606 }
1607 }
1608
1609 //
1610 // Function part - create a new variable and copy the data.
1611 // Both update a variable and create a variable will come here.
1612
1613 SetMem (NextVariable, ScratchSize, 0xff);
1614
1615 NextVariable->StartId = VARIABLE_DATA;
1616 //
1617 // NextVariable->State = VAR_ADDED;
1618 //
1619 NextVariable->Reserved = 0;
1620 NextVariable->PubKeyIndex = KeyIndex;
1621 NextVariable->MonotonicCount = MonotonicCount;
1622 ZeroMem (&NextVariable->TimeStamp, sizeof (EFI_TIME));
1623
1624 if (((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) != 0) &&
1625 (TimeStamp != NULL)) {
1626 if ((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) {
1627 CopyMem (&NextVariable->TimeStamp, TimeStamp, sizeof (EFI_TIME));
1628 } else {
1629 //
1630 // In the case when the EFI_VARIABLE_APPEND_WRITE attribute is set, only
1631 // when the new TimeStamp value is later than the current timestamp associated
1632 // with the variable, we need associate the new timestamp with the updated value.
1633 //
1634 if (Variable->CurrPtr != NULL) {
1635 if (CompareTimeStamp (&Variable->CurrPtr->TimeStamp, TimeStamp)) {
1636 CopyMem (&NextVariable->TimeStamp, TimeStamp, sizeof (EFI_TIME));
1637 }
1638 }
1639 }
1640 }
1641
1642 //
1643 // The EFI_VARIABLE_APPEND_WRITE attribute will never be set in the returned
1644 // Attributes bitmask parameter of a GetVariable() call.
1645 //
1646 NextVariable->Attributes = Attributes & (~EFI_VARIABLE_APPEND_WRITE);
1647
1648 VarNameOffset = sizeof (VARIABLE_HEADER);
1649 VarNameSize = StrSize (VariableName);
1650 CopyMem (
1651 (UINT8 *) ((UINTN) NextVariable + VarNameOffset),
1652 VariableName,
1653 VarNameSize
1654 );
1655 VarDataOffset = VarNameOffset + VarNameSize + GET_PAD_SIZE (VarNameSize);
1656 CopyMem (
1657 (UINT8 *) ((UINTN) NextVariable + VarDataOffset),
1658 Data,
1659 DataSize
1660 );
1661 CopyMem (&NextVariable->VendorGuid, VendorGuid, sizeof (EFI_GUID));
1662 //
1663 // There will be pad bytes after Data, the NextVariable->NameSize and
1664 // NextVariable->DataSize should not include pad size so that variable
1665 // service can get actual size in GetVariable.
1666 //
1667 NextVariable->NameSize = (UINT32)VarNameSize;
1668 NextVariable->DataSize = (UINT32)DataSize;
1669
1670 //
1671 // The actual size of the variable that stores in storage should
1672 // include pad size.
1673 //
1674 VarSize = VarDataOffset + DataSize + GET_PAD_SIZE (DataSize);
1675 if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
1676 //
1677 // Create a nonvolatile variable.
1678 //
1679 Volatile = FALSE;
1680 NonVolatileVarableStoreSize = ((VARIABLE_STORE_HEADER *)(UINTN)(mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase))->Size;
1681 if ((((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0)
1682 && ((VarSize + mVariableModuleGlobal->HwErrVariableTotalSize) > PcdGet32 (PcdHwErrStorageSize)))
1683 || (((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == 0)
1684 && ((VarSize + mVariableModuleGlobal->CommonVariableTotalSize) > NonVolatileVarableStoreSize - sizeof (VARIABLE_STORE_HEADER) - PcdGet32 (PcdHwErrStorageSize)))) {
1685 if (AtRuntime ()) {
1686 Status = EFI_OUT_OF_RESOURCES;
1687 goto Done;
1688 }
1689 //
1690 // Perform garbage collection & reclaim operation.
1691 //
1692 Status = Reclaim (mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase,
1693 &mVariableModuleGlobal->NonVolatileLastVariableOffset, FALSE, Variable->CurrPtr);
1694 if (EFI_ERROR (Status)) {
1695 goto Done;
1696 }
1697 //
1698 // If still no enough space, return out of resources.
1699 //
1700 if ((((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0)
1701 && ((VarSize + mVariableModuleGlobal->HwErrVariableTotalSize) > PcdGet32 (PcdHwErrStorageSize)))
1702 || (((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == 0)
1703 && ((VarSize + mVariableModuleGlobal->CommonVariableTotalSize) > NonVolatileVarableStoreSize - sizeof (VARIABLE_STORE_HEADER) - PcdGet32 (PcdHwErrStorageSize)))) {
1704 Status = EFI_OUT_OF_RESOURCES;
1705 goto Done;
1706 }
1707 Reclaimed = TRUE;
1708 }
1709 //
1710 // Four steps
1711 // 1. Write variable header
1712 // 2. Set variable state to header valid
1713 // 3. Write variable data
1714 // 4. Set variable state to valid
1715 //
1716 //
1717 // Step 1:
1718 //
1719 CacheOffset = mVariableModuleGlobal->NonVolatileLastVariableOffset;
1720 Status = UpdateVariableStore (
1721 &mVariableModuleGlobal->VariableGlobal,
1722 FALSE,
1723 TRUE,
1724 Fvb,
1725 mVariableModuleGlobal->NonVolatileLastVariableOffset,
1726 sizeof (VARIABLE_HEADER),
1727 (UINT8 *) NextVariable
1728 );
1729
1730 if (EFI_ERROR (Status)) {
1731 goto Done;
1732 }
1733
1734 //
1735 // Step 2:
1736 //
1737 NextVariable->State = VAR_HEADER_VALID_ONLY;
1738 Status = UpdateVariableStore (
1739 &mVariableModuleGlobal->VariableGlobal,
1740 FALSE,
1741 TRUE,
1742 Fvb,
1743 mVariableModuleGlobal->NonVolatileLastVariableOffset + OFFSET_OF (VARIABLE_HEADER, State),
1744 sizeof (UINT8),
1745 &NextVariable->State
1746 );
1747
1748 if (EFI_ERROR (Status)) {
1749 goto Done;
1750 }
1751 //
1752 // Step 3:
1753 //
1754 Status = UpdateVariableStore (
1755 &mVariableModuleGlobal->VariableGlobal,
1756 FALSE,
1757 TRUE,
1758 Fvb,
1759 mVariableModuleGlobal->NonVolatileLastVariableOffset + sizeof (VARIABLE_HEADER),
1760 (UINT32) VarSize - sizeof (VARIABLE_HEADER),
1761 (UINT8 *) NextVariable + sizeof (VARIABLE_HEADER)
1762 );
1763
1764 if (EFI_ERROR (Status)) {
1765 goto Done;
1766 }
1767 //
1768 // Step 4:
1769 //
1770 NextVariable->State = VAR_ADDED;
1771 Status = UpdateVariableStore (
1772 &mVariableModuleGlobal->VariableGlobal,
1773 FALSE,
1774 TRUE,
1775 Fvb,
1776 mVariableModuleGlobal->NonVolatileLastVariableOffset + OFFSET_OF (VARIABLE_HEADER, State),
1777 sizeof (UINT8),
1778 &NextVariable->State
1779 );
1780
1781 if (EFI_ERROR (Status)) {
1782 goto Done;
1783 }
1784
1785 mVariableModuleGlobal->NonVolatileLastVariableOffset += HEADER_ALIGN (VarSize);
1786
1787 if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0) {
1788 mVariableModuleGlobal->HwErrVariableTotalSize += HEADER_ALIGN (VarSize);
1789 } else {
1790 mVariableModuleGlobal->CommonVariableTotalSize += HEADER_ALIGN (VarSize);
1791 }
1792 //
1793 // update the memory copy of Flash region.
1794 //
1795 CopyMem ((UINT8 *)mNvVariableCache + CacheOffset, (UINT8 *)NextVariable, VarSize);
1796 } else {
1797 //
1798 // Create a volatile variable.
1799 //
1800 Volatile = TRUE;
1801
1802 if ((UINT32) (VarSize + mVariableModuleGlobal->VolatileLastVariableOffset) >
1803 ((VARIABLE_STORE_HEADER *) ((UINTN) (mVariableModuleGlobal->VariableGlobal.VolatileVariableBase)))->Size) {
1804 //
1805 // Perform garbage collection & reclaim operation.
1806 //
1807 Status = Reclaim (mVariableModuleGlobal->VariableGlobal.VolatileVariableBase,
1808 &mVariableModuleGlobal->VolatileLastVariableOffset, TRUE, Variable->CurrPtr);
1809 if (EFI_ERROR (Status)) {
1810 goto Done;
1811 }
1812 //
1813 // If still no enough space, return out of resources.
1814 //
1815 if ((UINT32) (VarSize + mVariableModuleGlobal->VolatileLastVariableOffset) >
1816 ((VARIABLE_STORE_HEADER *) ((UINTN) (mVariableModuleGlobal->VariableGlobal.VolatileVariableBase)))->Size
1817 ) {
1818 Status = EFI_OUT_OF_RESOURCES;
1819 goto Done;
1820 }
1821 Reclaimed = TRUE;
1822 }
1823
1824 NextVariable->State = VAR_ADDED;
1825 Status = UpdateVariableStore (
1826 &mVariableModuleGlobal->VariableGlobal,
1827 TRUE,
1828 TRUE,
1829 Fvb,
1830 mVariableModuleGlobal->VolatileLastVariableOffset,
1831 (UINT32) VarSize,
1832 (UINT8 *) NextVariable
1833 );
1834
1835 if (EFI_ERROR (Status)) {
1836 goto Done;
1837 }
1838
1839 mVariableModuleGlobal->VolatileLastVariableOffset += HEADER_ALIGN (VarSize);
1840 }
1841
1842 //
1843 // Mark the old variable as deleted.
1844 //
1845 if (!Reclaimed && !EFI_ERROR (Status) && Variable->CurrPtr != NULL) {
1846 State = Variable->CurrPtr->State;
1847 State &= VAR_DELETED;
1848
1849 Status = UpdateVariableStore (
1850 &mVariableModuleGlobal->VariableGlobal,
1851 Variable->Volatile,
1852 FALSE,
1853 Fvb,
1854 (UINTN) &Variable->CurrPtr->State,
1855 sizeof (UINT8),
1856 &State
1857 );
1858 if (!EFI_ERROR (Status) && !Variable->Volatile) {
1859 CacheVariable->CurrPtr->State = State;
1860 }
1861 }
1862
1863 if (!EFI_ERROR (Status)) {
1864 UpdateVariableInfo (VariableName, VendorGuid, Volatile, FALSE, TRUE, FALSE, FALSE);
1865 }
1866
1867 Done:
1868 return Status;
1869 }
1870
1871 /**
1872
1873 This code finds variable in storage blocks (Volatile or Non-Volatile).
1874
1875 @param VariableName Name of Variable to be found.
1876 @param VendorGuid Variable vendor GUID.
1877 @param Attributes Attribute value of the variable found.
1878 @param DataSize Size of Data found. If size is less than the
1879 data, this value contains the required size.
1880 @param Data Data pointer.
1881
1882 @return EFI_INVALID_PARAMETER Invalid parameter.
1883 @return EFI_SUCCESS Find the specified variable.
1884 @return EFI_NOT_FOUND Not found.
1885 @return EFI_BUFFER_TO_SMALL DataSize is too small for the result.
1886
1887 **/
1888 EFI_STATUS
1889 EFIAPI
1890 VariableServiceGetVariable (
1891 IN CHAR16 *VariableName,
1892 IN EFI_GUID *VendorGuid,
1893 OUT UINT32 *Attributes OPTIONAL,
1894 IN OUT UINTN *DataSize,
1895 OUT VOID *Data
1896 )
1897 {
1898 EFI_STATUS Status;
1899 VARIABLE_POINTER_TRACK Variable;
1900 UINTN VarDataSize;
1901
1902 if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {
1903 return EFI_INVALID_PARAMETER;
1904 }
1905
1906 AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
1907
1908 Status = FindVariable (VariableName, VendorGuid, &Variable, &mVariableModuleGlobal->VariableGlobal);
1909 if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
1910 goto Done;
1911 }
1912
1913 //
1914 // Get data size
1915 //
1916 VarDataSize = DataSizeOfVariable (Variable.CurrPtr);
1917 ASSERT (VarDataSize != 0);
1918
1919 if (*DataSize >= VarDataSize) {
1920 if (Data == NULL) {
1921 Status = EFI_INVALID_PARAMETER;
1922 goto Done;
1923 }
1924
1925 CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr), VarDataSize);
1926 if (Attributes != NULL) {
1927 *Attributes = Variable.CurrPtr->Attributes;
1928 }
1929
1930 *DataSize = VarDataSize;
1931 UpdateVariableInfo (VariableName, VendorGuid, Variable.Volatile, TRUE, FALSE, FALSE, FALSE);
1932
1933 Status = EFI_SUCCESS;
1934 goto Done;
1935 } else {
1936 *DataSize = VarDataSize;
1937 Status = EFI_BUFFER_TOO_SMALL;
1938 goto Done;
1939 }
1940
1941 Done:
1942 ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
1943 return Status;
1944 }
1945
1946
1947
1948 /**
1949
1950 This code Finds the Next available variable.
1951
1952 @param VariableNameSize Size of the variable name.
1953 @param VariableName Pointer to variable name.
1954 @param VendorGuid Variable Vendor Guid.
1955
1956 @return EFI_INVALID_PARAMETER Invalid parameter.
1957 @return EFI_SUCCESS Find the specified variable.
1958 @return EFI_NOT_FOUND Not found.
1959 @return EFI_BUFFER_TO_SMALL DataSize is too small for the result.
1960
1961 **/
1962 EFI_STATUS
1963 EFIAPI
1964 VariableServiceGetNextVariableName (
1965 IN OUT UINTN *VariableNameSize,
1966 IN OUT CHAR16 *VariableName,
1967 IN OUT EFI_GUID *VendorGuid
1968 )
1969 {
1970 VARIABLE_STORE_TYPE Type;
1971 VARIABLE_POINTER_TRACK Variable;
1972 VARIABLE_POINTER_TRACK VariableInHob;
1973 UINTN VarNameSize;
1974 EFI_STATUS Status;
1975 VARIABLE_STORE_HEADER *VariableStoreHeader[VariableStoreTypeMax];
1976
1977 if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {
1978 return EFI_INVALID_PARAMETER;
1979 }
1980
1981 AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
1982
1983 Status = FindVariable (VariableName, VendorGuid, &Variable, &mVariableModuleGlobal->VariableGlobal);
1984 if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
1985 goto Done;
1986 }
1987
1988 if (VariableName[0] != 0) {
1989 //
1990 // If variable name is not NULL, get next variable.
1991 //
1992 Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
1993 }
1994
1995 //
1996 // 0: Volatile, 1: HOB, 2: Non-Volatile.
1997 // The index and attributes mapping must be kept in this order as FindVariable
1998 // makes use of this mapping to implement search algorithm.
1999 //
2000 VariableStoreHeader[VariableStoreTypeVolatile] = (VARIABLE_STORE_HEADER *) (UINTN) mVariableModuleGlobal->VariableGlobal.VolatileVariableBase;
2001 VariableStoreHeader[VariableStoreTypeHob] = (VARIABLE_STORE_HEADER *) (UINTN) mVariableModuleGlobal->VariableGlobal.HobVariableBase;
2002 VariableStoreHeader[VariableStoreTypeNv] = mNvVariableCache;
2003
2004 while (TRUE) {
2005 //
2006 // Switch from Volatile to HOB, to Non-Volatile.
2007 //
2008 while ((Variable.CurrPtr >= Variable.EndPtr) ||
2009 (Variable.CurrPtr == NULL) ||
2010 !IsValidVariableHeader (Variable.CurrPtr)
2011 ) {
2012 //
2013 // Find current storage index
2014 //
2015 for (Type = (VARIABLE_STORE_TYPE) 0; Type < VariableStoreTypeMax; Type++) {
2016 if ((VariableStoreHeader[Type] != NULL) && (Variable.StartPtr == GetStartPointer (VariableStoreHeader[Type]))) {
2017 break;
2018 }
2019 }
2020 ASSERT (Type < VariableStoreTypeMax);
2021 //
2022 // Switch to next storage
2023 //
2024 for (Type++; Type < VariableStoreTypeMax; Type++) {
2025 if (VariableStoreHeader[Type] != NULL) {
2026 break;
2027 }
2028 }
2029 //
2030 // Capture the case that
2031 // 1. current storage is the last one, or
2032 // 2. no further storage
2033 //
2034 if (Type == VariableStoreTypeMax) {
2035 Status = EFI_NOT_FOUND;
2036 goto Done;
2037 }
2038 Variable.StartPtr = GetStartPointer (VariableStoreHeader[Type]);
2039 Variable.EndPtr = GetEndPointer (VariableStoreHeader[Type]);
2040 Variable.CurrPtr = Variable.StartPtr;
2041 }
2042
2043 //
2044 // Variable is found
2045 //
2046 if (Variable.CurrPtr->State == VAR_ADDED) {
2047 if ((AtRuntime () && ((Variable.CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0)) == 0) {
2048
2049 //
2050 // Don't return NV variable when HOB overrides it
2051 //
2052 if ((VariableStoreHeader[VariableStoreTypeHob] != NULL) && (VariableStoreHeader[VariableStoreTypeNv] != NULL) &&
2053 (Variable.StartPtr == GetStartPointer (VariableStoreHeader[VariableStoreTypeNv]))
2054 ) {
2055 VariableInHob.StartPtr = GetStartPointer (VariableStoreHeader[VariableStoreTypeHob]);
2056 VariableInHob.EndPtr = GetEndPointer (VariableStoreHeader[VariableStoreTypeHob]);
2057 Status = FindVariableEx (
2058 GetVariableNamePtr (Variable.CurrPtr),
2059 &Variable.CurrPtr->VendorGuid,
2060 &VariableInHob
2061 );
2062 if (!EFI_ERROR (Status)) {
2063 Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
2064 continue;
2065 }
2066 }
2067
2068 VarNameSize = NameSizeOfVariable (Variable.CurrPtr);
2069 ASSERT (VarNameSize != 0);
2070
2071 if (VarNameSize <= *VariableNameSize) {
2072 CopyMem (VariableName, GetVariableNamePtr (Variable.CurrPtr), VarNameSize);
2073 CopyMem (VendorGuid, &Variable.CurrPtr->VendorGuid, sizeof (EFI_GUID));
2074 Status = EFI_SUCCESS;
2075 } else {
2076 Status = EFI_BUFFER_TOO_SMALL;
2077 }
2078
2079 *VariableNameSize = VarNameSize;
2080 goto Done;
2081 }
2082 }
2083
2084 Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
2085 }
2086
2087 Done:
2088 ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
2089 return Status;
2090 }
2091
2092 /**
2093
2094 This code sets variable in storage blocks (Volatile or Non-Volatile).
2095
2096 @param VariableName Name of Variable to be found.
2097 @param VendorGuid Variable vendor GUID.
2098 @param Attributes Attribute value of the variable found
2099 @param DataSize Size of Data found. If size is less than the
2100 data, this value contains the required size.
2101 @param Data Data pointer.
2102
2103 @return EFI_INVALID_PARAMETER Invalid parameter.
2104 @return EFI_SUCCESS Set successfully.
2105 @return EFI_OUT_OF_RESOURCES Resource not enough to set variable.
2106 @return EFI_NOT_FOUND Not found.
2107 @return EFI_WRITE_PROTECTED Variable is read-only.
2108
2109 **/
2110 EFI_STATUS
2111 EFIAPI
2112 VariableServiceSetVariable (
2113 IN CHAR16 *VariableName,
2114 IN EFI_GUID *VendorGuid,
2115 IN UINT32 Attributes,
2116 IN UINTN DataSize,
2117 IN VOID *Data
2118 )
2119 {
2120 VARIABLE_POINTER_TRACK Variable;
2121 EFI_STATUS Status;
2122 VARIABLE_HEADER *NextVariable;
2123 EFI_PHYSICAL_ADDRESS Point;
2124 UINTN PayloadSize;
2125
2126 //
2127 // Check input parameters.
2128 //
2129 if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {
2130 return EFI_INVALID_PARAMETER;
2131 }
2132
2133 if (DataSize != 0 && Data == NULL) {
2134 return EFI_INVALID_PARAMETER;
2135 }
2136
2137 //
2138 // Make sure if runtime bit is set, boot service bit is set also.
2139 //
2140 if ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == EFI_VARIABLE_RUNTIME_ACCESS) {
2141 return EFI_INVALID_PARAMETER;
2142 }
2143
2144 //
2145 // EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS and EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS attribute
2146 // cannot be set both.
2147 //
2148 if (((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS)
2149 && ((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)) {
2150 return EFI_INVALID_PARAMETER;
2151 }
2152
2153 if ((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) {
2154 if (DataSize < AUTHINFO_SIZE) {
2155 //
2156 // Try to write Authenticated Variable without AuthInfo.
2157 //
2158 return EFI_SECURITY_VIOLATION;
2159 }
2160 PayloadSize = DataSize - AUTHINFO_SIZE;
2161 } else if ((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) {
2162 //
2163 // Sanity check for EFI_VARIABLE_AUTHENTICATION_2 descriptor.
2164 //
2165 if (DataSize < OFFSET_OF_AUTHINFO2_CERT_DATA ||
2166 ((EFI_VARIABLE_AUTHENTICATION_2 *) Data)->AuthInfo.Hdr.dwLength > DataSize - (OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) ||
2167 ((EFI_VARIABLE_AUTHENTICATION_2 *) Data)->AuthInfo.Hdr.dwLength < OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)) {
2168 return EFI_SECURITY_VIOLATION;
2169 }
2170 PayloadSize = DataSize - AUTHINFO2_SIZE (Data);
2171 } else {
2172 PayloadSize = DataSize;
2173 }
2174
2175 //
2176 // The size of the VariableName, including the Unicode Null in bytes plus
2177 // the DataSize is limited to maximum size of PcdGet32 (PcdMaxHardwareErrorVariableSize)
2178 // bytes for HwErrRec, and PcdGet32 (PcdMaxVariableSize) bytes for the others.
2179 //
2180 if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
2181 if ((PayloadSize > PcdGet32 (PcdMaxHardwareErrorVariableSize)) ||
2182 (sizeof (VARIABLE_HEADER) + StrSize (VariableName) + PayloadSize > PcdGet32 (PcdMaxHardwareErrorVariableSize))) {
2183 return EFI_INVALID_PARAMETER;
2184 }
2185 //
2186 // According to UEFI spec, HARDWARE_ERROR_RECORD variable name convention should be L"HwErrRecXXXX".
2187 //
2188 if (StrnCmp(VariableName, L"HwErrRec", StrLen(L"HwErrRec")) != 0) {
2189 return EFI_INVALID_PARAMETER;
2190 }
2191 } else {
2192 //
2193 // The size of the VariableName, including the Unicode Null in bytes plus
2194 // the DataSize is limited to maximum size of PcdGet32 (PcdMaxVariableSize) bytes.
2195 //
2196 if ((PayloadSize > PcdGet32 (PcdMaxVariableSize)) ||
2197 (sizeof (VARIABLE_HEADER) + StrSize (VariableName) + PayloadSize > PcdGet32 (PcdMaxVariableSize))) {
2198 return EFI_INVALID_PARAMETER;
2199 }
2200 }
2201
2202 AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
2203
2204 //
2205 // Consider reentrant in MCA/INIT/NMI. It needs be reupdated.
2206 //
2207 if (1 < InterlockedIncrement (&mVariableModuleGlobal->VariableGlobal.ReentrantState)) {
2208 Point = mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase;
2209 //
2210 // Parse non-volatile variable data and get last variable offset.
2211 //
2212 NextVariable = GetStartPointer ((VARIABLE_STORE_HEADER *) (UINTN) Point);
2213 while ((NextVariable < GetEndPointer ((VARIABLE_STORE_HEADER *) (UINTN) Point))
2214 && IsValidVariableHeader (NextVariable)) {
2215 NextVariable = GetNextVariablePtr (NextVariable);
2216 }
2217 mVariableModuleGlobal->NonVolatileLastVariableOffset = (UINTN) NextVariable - (UINTN) Point;
2218 }
2219
2220 //
2221 // Check whether the input variable is already existed.
2222 //
2223 FindVariable (VariableName, VendorGuid, &Variable, &mVariableModuleGlobal->VariableGlobal);
2224
2225 //
2226 // Hook the operation of setting PlatformLangCodes/PlatformLang and LangCodes/Lang.
2227 //
2228 AutoUpdateLangVariable (VariableName, Data, DataSize);
2229 //
2230 // Process PK, KEK, Sigdb seperately.
2231 //
2232 if (CompareGuid (VendorGuid, &gEfiGlobalVariableGuid) && (StrCmp (VariableName, EFI_PLATFORM_KEY_NAME) == 0)){
2233 Status = ProcessVarWithPk (VariableName, VendorGuid, Data, DataSize, &Variable, Attributes, TRUE);
2234 } else if (CompareGuid (VendorGuid, &gEfiGlobalVariableGuid) && (StrCmp (VariableName, EFI_KEY_EXCHANGE_KEY_NAME) == 0)) {
2235 Status = ProcessVarWithPk (VariableName, VendorGuid, Data, DataSize, &Variable, Attributes, FALSE);
2236 } else if (CompareGuid (VendorGuid, &gEfiImageSecurityDatabaseGuid) && ((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) == 0)) {
2237 Status = ProcessVarWithKek (VariableName, VendorGuid, Data, DataSize, &Variable, Attributes);
2238 } else {
2239 Status = ProcessVariable (VariableName, VendorGuid, Data, DataSize, &Variable, Attributes);
2240 }
2241
2242 InterlockedDecrement (&mVariableModuleGlobal->VariableGlobal.ReentrantState);
2243 ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
2244
2245 return Status;
2246 }
2247
2248 /**
2249
2250 This code returns information about the EFI variables.
2251
2252 @param Attributes Attributes bitmask to specify the type of variables
2253 on which to return information.
2254 @param MaximumVariableStorageSize Pointer to the maximum size of the storage space available
2255 for the EFI variables associated with the attributes specified.
2256 @param RemainingVariableStorageSize Pointer to the remaining size of the storage space available
2257 for EFI variables associated with the attributes specified.
2258 @param MaximumVariableSize Pointer to the maximum size of an individual EFI variables
2259 associated with the attributes specified.
2260
2261 @return EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied.
2262 @return EFI_SUCCESS Query successfully.
2263 @return EFI_UNSUPPORTED The attribute is not supported on this platform.
2264
2265 **/
2266 EFI_STATUS
2267 EFIAPI
2268 VariableServiceQueryVariableInfo (
2269 IN UINT32 Attributes,
2270 OUT UINT64 *MaximumVariableStorageSize,
2271 OUT UINT64 *RemainingVariableStorageSize,
2272 OUT UINT64 *MaximumVariableSize
2273 )
2274 {
2275 VARIABLE_HEADER *Variable;
2276 VARIABLE_HEADER *NextVariable;
2277 UINT64 VariableSize;
2278 VARIABLE_STORE_HEADER *VariableStoreHeader;
2279 UINT64 CommonVariableTotalSize;
2280 UINT64 HwErrVariableTotalSize;
2281
2282 CommonVariableTotalSize = 0;
2283 HwErrVariableTotalSize = 0;
2284
2285 if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {
2286 return EFI_INVALID_PARAMETER;
2287 }
2288
2289 if((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == 0) {
2290 //
2291 // Make sure the Attributes combination is supported by the platform.
2292 //
2293 return EFI_UNSUPPORTED;
2294 } else if ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == EFI_VARIABLE_RUNTIME_ACCESS) {
2295 //
2296 // Make sure if runtime bit is set, boot service bit is set also.
2297 //
2298 return EFI_INVALID_PARAMETER;
2299 } else if (AtRuntime () && ((Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0)) {
2300 //
2301 // Make sure RT Attribute is set if we are in Runtime phase.
2302 //
2303 return EFI_INVALID_PARAMETER;
2304 } else if ((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
2305 //
2306 // Make sure Hw Attribute is set with NV.
2307 //
2308 return EFI_INVALID_PARAMETER;
2309 }
2310
2311 AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
2312
2313 if((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
2314 //
2315 // Query is Volatile related.
2316 //
2317 VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) mVariableModuleGlobal->VariableGlobal.VolatileVariableBase);
2318 } else {
2319 //
2320 // Query is Non-Volatile related.
2321 //
2322 VariableStoreHeader = mNvVariableCache;
2323 }
2324
2325 //
2326 // Now let's fill *MaximumVariableStorageSize *RemainingVariableStorageSize
2327 // with the storage size (excluding the storage header size).
2328 //
2329 *MaximumVariableStorageSize = VariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER);
2330
2331 //
2332 // Harware error record variable needs larger size.
2333 //
2334 if ((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
2335 *MaximumVariableStorageSize = PcdGet32 (PcdHwErrStorageSize);
2336 *MaximumVariableSize = PcdGet32 (PcdMaxHardwareErrorVariableSize) - sizeof (VARIABLE_HEADER);
2337 } else {
2338 if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
2339 ASSERT (PcdGet32 (PcdHwErrStorageSize) < VariableStoreHeader->Size);
2340 *MaximumVariableStorageSize = VariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER) - PcdGet32 (PcdHwErrStorageSize);
2341 }
2342
2343 //
2344 // Let *MaximumVariableSize be PcdGet32 (PcdMaxVariableSize) with the exception of the variable header size.
2345 //
2346 *MaximumVariableSize = PcdGet32 (PcdMaxVariableSize) - sizeof (VARIABLE_HEADER);
2347 }
2348
2349 //
2350 // Point to the starting address of the variables.
2351 //
2352 Variable = GetStartPointer (VariableStoreHeader);
2353
2354 //
2355 // Now walk through the related variable store.
2356 //
2357 while ((Variable < GetEndPointer (VariableStoreHeader)) && IsValidVariableHeader (Variable)) {
2358 NextVariable = GetNextVariablePtr (Variable);
2359 VariableSize = (UINT64) (UINTN) NextVariable - (UINT64) (UINTN) Variable;
2360
2361 if (AtRuntime ()) {
2362 //
2363 // We don't take the state of the variables in mind
2364 // when calculating RemainingVariableStorageSize,
2365 // since the space occupied by variables not marked with
2366 // VAR_ADDED is not allowed to be reclaimed in Runtime.
2367 //
2368 if ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
2369 HwErrVariableTotalSize += VariableSize;
2370 } else {
2371 CommonVariableTotalSize += VariableSize;
2372 }
2373 } else {
2374 //
2375 // Only care about Variables with State VAR_ADDED, because
2376 // the space not marked as VAR_ADDED is reclaimable now.
2377 //
2378 if (Variable->State == VAR_ADDED) {
2379 if ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
2380 HwErrVariableTotalSize += VariableSize;
2381 } else {
2382 CommonVariableTotalSize += VariableSize;
2383 }
2384 }
2385 }
2386
2387 //
2388 // Go to the next one.
2389 //
2390 Variable = NextVariable;
2391 }
2392
2393 if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD){
2394 *RemainingVariableStorageSize = *MaximumVariableStorageSize - HwErrVariableTotalSize;
2395 }else {
2396 *RemainingVariableStorageSize = *MaximumVariableStorageSize - CommonVariableTotalSize;
2397 }
2398
2399 if (*RemainingVariableStorageSize < sizeof (VARIABLE_HEADER)) {
2400 *MaximumVariableSize = 0;
2401 } else if ((*RemainingVariableStorageSize - sizeof (VARIABLE_HEADER)) < *MaximumVariableSize) {
2402 *MaximumVariableSize = *RemainingVariableStorageSize - sizeof (VARIABLE_HEADER);
2403 }
2404
2405 ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
2406 return EFI_SUCCESS;
2407 }
2408
2409
2410 /**
2411 This function reclaims variable storage if free size is below the threshold.
2412
2413 **/
2414 VOID
2415 ReclaimForOS(
2416 VOID
2417 )
2418 {
2419 EFI_STATUS Status;
2420 UINTN CommonVariableSpace;
2421 UINTN RemainingCommonVariableSpace;
2422 UINTN RemainingHwErrVariableSpace;
2423
2424 Status = EFI_SUCCESS;
2425
2426 CommonVariableSpace = ((VARIABLE_STORE_HEADER *) ((UINTN) (mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase)))->Size - sizeof (VARIABLE_STORE_HEADER) - PcdGet32(PcdHwErrStorageSize); //Allowable max size of common variable storage space
2427
2428 RemainingCommonVariableSpace = CommonVariableSpace - mVariableModuleGlobal->CommonVariableTotalSize;
2429
2430 RemainingHwErrVariableSpace = PcdGet32 (PcdHwErrStorageSize) - mVariableModuleGlobal->HwErrVariableTotalSize;
2431 //
2432 // Check if the free area is blow a threshold.
2433 //
2434 if ((RemainingCommonVariableSpace < PcdGet32 (PcdMaxVariableSize))
2435 || ((PcdGet32 (PcdHwErrStorageSize) != 0) &&
2436 (RemainingHwErrVariableSpace < PcdGet32 (PcdMaxHardwareErrorVariableSize)))){
2437 Status = Reclaim (
2438 mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase,
2439 &mVariableModuleGlobal->NonVolatileLastVariableOffset,
2440 FALSE,
2441 NULL
2442 );
2443 ASSERT_EFI_ERROR (Status);
2444 }
2445 }
2446
2447
2448 /**
2449 Initializes variable write service after FVB was ready.
2450
2451 @retval EFI_SUCCESS Function successfully executed.
2452 @retval Others Fail to initialize the variable service.
2453
2454 **/
2455 EFI_STATUS
2456 VariableWriteServiceInitialize (
2457 VOID
2458 )
2459 {
2460 EFI_STATUS Status;
2461 VARIABLE_STORE_HEADER *VariableStoreHeader;
2462 UINTN Index;
2463 UINT8 Data;
2464 EFI_PHYSICAL_ADDRESS VariableStoreBase;
2465 VARIABLE_HEADER *Variable;
2466 VOID *VariableData;
2467
2468 VariableStoreBase = mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase;
2469 VariableStoreHeader = (VARIABLE_STORE_HEADER *)(UINTN)VariableStoreBase;
2470
2471 //
2472 // Check if the free area is really free.
2473 //
2474 for (Index = mVariableModuleGlobal->NonVolatileLastVariableOffset; Index < VariableStoreHeader->Size; Index++) {
2475 Data = ((UINT8 *) mNvVariableCache)[Index];
2476 if (Data != 0xff) {
2477 //
2478 // There must be something wrong in variable store, do reclaim operation.
2479 //
2480 Status = Reclaim (
2481 mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase,
2482 &mVariableModuleGlobal->NonVolatileLastVariableOffset,
2483 FALSE,
2484 NULL
2485 );
2486 if (EFI_ERROR (Status)) {
2487 return Status;
2488 }
2489 break;
2490 }
2491 }
2492
2493
2494 //
2495 // Flush the HOB variable to flash and invalidate HOB variable.
2496 //
2497 if (mVariableModuleGlobal->VariableGlobal.HobVariableBase != 0) {
2498 //
2499 // Clear the HobVariableBase to avoid SetVariable() updating the variable in HOB
2500 //
2501 VariableStoreHeader = (VARIABLE_STORE_HEADER *) (UINTN) mVariableModuleGlobal->VariableGlobal.HobVariableBase;
2502 mVariableModuleGlobal->VariableGlobal.HobVariableBase = 0;
2503
2504 for ( Variable = GetStartPointer (VariableStoreHeader)
2505 ; (Variable < GetEndPointer (VariableStoreHeader) && IsValidVariableHeader (Variable))
2506 ; Variable = GetNextVariablePtr (Variable)
2507 ) {
2508 ASSERT (Variable->State == VAR_ADDED);
2509 ASSERT ((Variable->Attributes & EFI_VARIABLE_NON_VOLATILE) != 0);
2510 VariableData = GetVariableDataPtr (Variable);
2511 Status = VariableServiceSetVariable (
2512 GetVariableNamePtr (Variable),
2513 &Variable->VendorGuid,
2514 Variable->Attributes,
2515 Variable->DataSize,
2516 VariableData
2517 );
2518 ASSERT_EFI_ERROR (Status);
2519 }
2520 }
2521
2522 //
2523 // Authenticated variable initialize.
2524 //
2525 Status = AutenticatedVariableServiceInitialize ();
2526
2527 return Status;
2528 }
2529
2530
2531 /**
2532 Initializes variable store area for non-volatile and volatile variable.
2533
2534 @retval EFI_SUCCESS Function successfully executed.
2535 @retval EFI_OUT_OF_RESOURCES Fail to allocate enough memory resource.
2536
2537 **/
2538 EFI_STATUS
2539 VariableCommonInitialize (
2540 VOID
2541 )
2542 {
2543 EFI_STATUS Status;
2544 VARIABLE_STORE_HEADER *VolatileVariableStore;
2545 VARIABLE_STORE_HEADER *VariableStoreHeader;
2546 VARIABLE_HEADER *NextVariable;
2547 EFI_PHYSICAL_ADDRESS TempVariableStoreHeader;
2548 EFI_PHYSICAL_ADDRESS VariableStoreBase;
2549 UINT64 VariableStoreLength;
2550 UINTN ScratchSize;
2551 UINTN VariableSize;
2552 EFI_HOB_GUID_TYPE *GuidHob;
2553
2554 //
2555 // Allocate runtime memory for variable driver global structure.
2556 //
2557 mVariableModuleGlobal = AllocateRuntimeZeroPool (sizeof (VARIABLE_MODULE_GLOBAL));
2558 if (mVariableModuleGlobal == NULL) {
2559 return EFI_OUT_OF_RESOURCES;
2560 }
2561
2562 InitializeLock (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock, TPL_NOTIFY);
2563
2564 //
2565 // Note that in EdkII variable driver implementation, Hardware Error Record type variable
2566 // is stored with common variable in the same NV region. So the platform integrator should
2567 // ensure that the value of PcdHwErrStorageSize is less than or equal to the value of
2568 // PcdFlashNvStorageVariableSize.
2569 //
2570 ASSERT (PcdGet32 (PcdHwErrStorageSize) <= PcdGet32 (PcdFlashNvStorageVariableSize));
2571
2572 //
2573 // Get HOB variable store.
2574 //
2575 GuidHob = GetFirstGuidHob (&gEfiAuthenticatedVariableGuid);
2576 if (GuidHob != NULL) {
2577 VariableStoreHeader = GET_GUID_HOB_DATA (GuidHob);
2578 if (GetVariableStoreStatus (VariableStoreHeader) == EfiValid) {
2579 mVariableModuleGlobal->VariableGlobal.HobVariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) VariableStoreHeader;
2580 } else {
2581 DEBUG ((EFI_D_ERROR, "HOB Variable Store header is corrupted!\n"));
2582 }
2583 }
2584
2585 //
2586 // Allocate memory for volatile variable store, note that there is a scratch space to store scratch data.
2587 //
2588 ScratchSize = MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize));
2589 VolatileVariableStore = AllocateRuntimePool (PcdGet32 (PcdVariableStoreSize) + ScratchSize);
2590 if (VolatileVariableStore == NULL) {
2591 FreePool (mVariableModuleGlobal);
2592 return EFI_OUT_OF_RESOURCES;
2593 }
2594
2595 SetMem (VolatileVariableStore, PcdGet32 (PcdVariableStoreSize) + ScratchSize, 0xff);
2596
2597 //
2598 // Initialize Variable Specific Data.
2599 //
2600 mVariableModuleGlobal->VariableGlobal.VolatileVariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) VolatileVariableStore;
2601 mVariableModuleGlobal->VolatileLastVariableOffset = (UINTN) GetStartPointer (VolatileVariableStore) - (UINTN) VolatileVariableStore;
2602 mVariableModuleGlobal->FvbInstance = NULL;
2603
2604 CopyGuid (&VolatileVariableStore->Signature, &gEfiAuthenticatedVariableGuid);
2605 VolatileVariableStore->Size = PcdGet32 (PcdVariableStoreSize);
2606 VolatileVariableStore->Format = VARIABLE_STORE_FORMATTED;
2607 VolatileVariableStore->State = VARIABLE_STORE_HEALTHY;
2608 VolatileVariableStore->Reserved = 0;
2609 VolatileVariableStore->Reserved1 = 0;
2610
2611 //
2612 // Get non-volatile variable store.
2613 //
2614
2615 TempVariableStoreHeader = (EFI_PHYSICAL_ADDRESS) PcdGet64 (PcdFlashNvStorageVariableBase64);
2616 if (TempVariableStoreHeader == 0) {
2617 TempVariableStoreHeader = (EFI_PHYSICAL_ADDRESS) PcdGet32 (PcdFlashNvStorageVariableBase);
2618 }
2619
2620 //
2621 // Check if the Firmware Volume is not corrupted
2622 //
2623 if ((((EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)(TempVariableStoreHeader))->Signature != EFI_FVH_SIGNATURE) ||
2624 (!CompareGuid (&gEfiSystemNvDataFvGuid, &((EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)(TempVariableStoreHeader))->FileSystemGuid))) {
2625 Status = EFI_VOLUME_CORRUPTED;
2626 DEBUG ((EFI_D_ERROR, "Firmware Volume for Variable Store is corrupted\n"));
2627 goto Done;
2628 }
2629
2630 VariableStoreBase = TempVariableStoreHeader + \
2631 (((EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)(TempVariableStoreHeader)) -> HeaderLength);
2632 VariableStoreLength = (UINT64) PcdGet32 (PcdFlashNvStorageVariableSize) - \
2633 (((EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)(TempVariableStoreHeader)) -> HeaderLength);
2634
2635 mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase = VariableStoreBase;
2636 VariableStoreHeader = (VARIABLE_STORE_HEADER *)(UINTN)VariableStoreBase;
2637 if (GetVariableStoreStatus (VariableStoreHeader) != EfiValid) {
2638 Status = EFI_VOLUME_CORRUPTED;
2639 DEBUG((EFI_D_INFO, "Variable Store header is corrupted\n"));
2640 goto Done;
2641 }
2642 ASSERT(VariableStoreHeader->Size == VariableStoreLength);
2643
2644 //
2645 // Parse non-volatile variable data and get last variable offset.
2646 //
2647 NextVariable = GetStartPointer ((VARIABLE_STORE_HEADER *)(UINTN)VariableStoreBase);
2648 while (IsValidVariableHeader (NextVariable)) {
2649 VariableSize = NextVariable->NameSize + NextVariable->DataSize + sizeof (VARIABLE_HEADER);
2650 if ((NextVariable->Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
2651 mVariableModuleGlobal->HwErrVariableTotalSize += HEADER_ALIGN (VariableSize);
2652 } else {
2653 mVariableModuleGlobal->CommonVariableTotalSize += HEADER_ALIGN (VariableSize);
2654 }
2655
2656 NextVariable = GetNextVariablePtr (NextVariable);
2657 }
2658
2659 mVariableModuleGlobal->NonVolatileLastVariableOffset = (UINTN) NextVariable - (UINTN) VariableStoreBase;
2660
2661 //
2662 // Allocate runtime memory used for a memory copy of the FLASH region.
2663 // Keep the memory and the FLASH in sync as updates occur
2664 //
2665 mNvVariableCache = AllocateRuntimeZeroPool ((UINTN)VariableStoreLength);
2666 if (mNvVariableCache == NULL) {
2667 Status = EFI_OUT_OF_RESOURCES;
2668 goto Done;
2669 }
2670 CopyMem (mNvVariableCache, (CHAR8 *)(UINTN)VariableStoreBase, (UINTN)VariableStoreLength);
2671 Status = EFI_SUCCESS;
2672
2673 Done:
2674 if (EFI_ERROR (Status)) {
2675 FreePool (mVariableModuleGlobal);
2676 FreePool (VolatileVariableStore);
2677 }
2678
2679 return Status;
2680 }
2681
2682
2683 /**
2684 Get the proper fvb handle and/or fvb protocol by the given Flash address.
2685
2686 @param[in] Address The Flash address.
2687 @param[out] FvbHandle In output, if it is not NULL, it points to the proper FVB handle.
2688 @param[out] FvbProtocol In output, if it is not NULL, it points to the proper FVB protocol.
2689
2690 **/
2691 EFI_STATUS
2692 GetFvbInfoByAddress (
2693 IN EFI_PHYSICAL_ADDRESS Address,
2694 OUT EFI_HANDLE *FvbHandle OPTIONAL,
2695 OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvbProtocol OPTIONAL
2696 )
2697 {
2698 EFI_STATUS Status;
2699 EFI_HANDLE *HandleBuffer;
2700 UINTN HandleCount;
2701 UINTN Index;
2702 EFI_PHYSICAL_ADDRESS FvbBaseAddress;
2703 EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
2704 EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
2705 EFI_FVB_ATTRIBUTES_2 Attributes;
2706
2707 //
2708 // Get all FVB handles.
2709 //
2710 Status = GetFvbCountAndBuffer (&HandleCount, &HandleBuffer);
2711 if (EFI_ERROR (Status)) {
2712 return EFI_NOT_FOUND;
2713 }
2714
2715 //
2716 // Get the FVB to access variable store.
2717 //
2718 Fvb = NULL;
2719 for (Index = 0; Index < HandleCount; Index += 1, Status = EFI_NOT_FOUND, Fvb = NULL) {
2720 Status = GetFvbByHandle (HandleBuffer[Index], &Fvb);
2721 if (EFI_ERROR (Status)) {
2722 Status = EFI_NOT_FOUND;
2723 break;
2724 }
2725
2726 //
2727 // Ensure this FVB protocol supported Write operation.
2728 //
2729 Status = Fvb->GetAttributes (Fvb, &Attributes);
2730 if (EFI_ERROR (Status) || ((Attributes & EFI_FVB2_WRITE_STATUS) == 0)) {
2731 continue;
2732 }
2733
2734 //
2735 // Compare the address and select the right one.
2736 //
2737 Status = Fvb->GetPhysicalAddress (Fvb, &FvbBaseAddress);
2738 if (EFI_ERROR (Status)) {
2739 continue;
2740 }
2741
2742 FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvbBaseAddress);
2743 if ((Address >= FvbBaseAddress) && (Address < (FvbBaseAddress + FwVolHeader->FvLength))) {
2744 if (FvbHandle != NULL) {
2745 *FvbHandle = HandleBuffer[Index];
2746 }
2747 if (FvbProtocol != NULL) {
2748 *FvbProtocol = Fvb;
2749 }
2750 Status = EFI_SUCCESS;
2751 break;
2752 }
2753 }
2754 FreePool (HandleBuffer);
2755
2756 if (Fvb == NULL) {
2757 Status = EFI_NOT_FOUND;
2758 }
2759
2760 return Status;
2761 }
2762
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