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1 /** @file
2 Implement ReadOnly Variable Services required by PEIM and install
3 PEI ReadOnly Varaiable2 PPI. These services operates the non volatile storage space.
4
5 Copyright (c) 2006 - 2018, 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
17 #include "Variable.h"
18
19 //
20 // Module globals
21 //
22 EFI_PEI_READ_ONLY_VARIABLE2_PPI mVariablePpi = {
23 PeiGetVariable,
24 PeiGetNextVariableName
25 };
26
27 EFI_PEI_PPI_DESCRIPTOR mPpiListVariable = {
28 (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
29 &gEfiPeiReadOnlyVariable2PpiGuid,
30 &mVariablePpi
31 };
32
33
34 /**
35 Provide the functionality of the variable services.
36
37 @param FileHandle Handle of the file being invoked.
38 Type EFI_PEI_FILE_HANDLE is defined in FfsFindNextFile().
39 @param PeiServices General purpose services available to every PEIM.
40
41 @retval EFI_SUCCESS If the interface could be successfully installed
42 @retval Others Returned from PeiServicesInstallPpi()
43 **/
44 EFI_STATUS
45 EFIAPI
46 PeimInitializeVariableServices (
47 IN EFI_PEI_FILE_HANDLE FileHandle,
48 IN CONST EFI_PEI_SERVICES **PeiServices
49 )
50 {
51 return PeiServicesInstallPpi (&mPpiListVariable);
52 }
53
54 /**
55
56 Gets the pointer to the first variable header in given variable store area.
57
58 @param VarStoreHeader Pointer to the Variable Store Header.
59
60 @return Pointer to the first variable header.
61
62 **/
63 VARIABLE_HEADER *
64 GetStartPointer (
65 IN VARIABLE_STORE_HEADER *VarStoreHeader
66 )
67 {
68 //
69 // The start of variable store
70 //
71 return (VARIABLE_HEADER *) HEADER_ALIGN (VarStoreHeader + 1);
72 }
73
74
75 /**
76
77 Gets the pointer to the end of the variable storage area.
78
79 This function gets pointer to the end of the variable storage
80 area, according to the input variable store header.
81
82 @param VarStoreHeader Pointer to the Variable Store Header.
83
84 @return Pointer to the end of the variable storage area.
85
86 **/
87 VARIABLE_HEADER *
88 GetEndPointer (
89 IN VARIABLE_STORE_HEADER *VarStoreHeader
90 )
91 {
92 //
93 // The end of variable store
94 //
95 return (VARIABLE_HEADER *) HEADER_ALIGN ((UINTN) VarStoreHeader + VarStoreHeader->Size);
96 }
97
98
99 /**
100 This code checks if variable header is valid or not.
101
102 @param Variable Pointer to the Variable Header.
103
104 @retval TRUE Variable header is valid.
105 @retval FALSE Variable header is not valid.
106
107 **/
108 BOOLEAN
109 IsValidVariableHeader (
110 IN VARIABLE_HEADER *Variable
111 )
112 {
113 if (Variable == NULL || Variable->StartId != VARIABLE_DATA ) {
114 return FALSE;
115 }
116
117 return TRUE;
118 }
119
120 /**
121 This code gets the size of variable header.
122
123 @param AuthFlag Authenticated variable flag.
124
125 @return Size of variable header in bytes in type UINTN.
126
127 **/
128 UINTN
129 GetVariableHeaderSize (
130 IN BOOLEAN AuthFlag
131 )
132 {
133 UINTN Value;
134
135 if (AuthFlag) {
136 Value = sizeof (AUTHENTICATED_VARIABLE_HEADER);
137 } else {
138 Value = sizeof (VARIABLE_HEADER);
139 }
140
141 return Value;
142 }
143
144 /**
145 This code gets the size of name of variable.
146
147 @param Variable Pointer to the Variable Header.
148 @param AuthFlag Authenticated variable flag.
149
150 @return Size of variable in bytes in type UINTN.
151
152 **/
153 UINTN
154 NameSizeOfVariable (
155 IN VARIABLE_HEADER *Variable,
156 IN BOOLEAN AuthFlag
157 )
158 {
159 AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
160
161 AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
162 if (AuthFlag) {
163 if (AuthVariable->State == (UINT8) (-1) ||
164 AuthVariable->DataSize == (UINT32) (-1) ||
165 AuthVariable->NameSize == (UINT32) (-1) ||
166 AuthVariable->Attributes == (UINT32) (-1)) {
167 return 0;
168 }
169 return (UINTN) AuthVariable->NameSize;
170 } else {
171 if (Variable->State == (UINT8) (-1) ||
172 Variable->DataSize == (UINT32) (-1) ||
173 Variable->NameSize == (UINT32) (-1) ||
174 Variable->Attributes == (UINT32) (-1)) {
175 return 0;
176 }
177 return (UINTN) Variable->NameSize;
178 }
179 }
180
181
182 /**
183 This code gets the size of data of variable.
184
185 @param Variable Pointer to the Variable Header.
186 @param AuthFlag Authenticated variable flag.
187
188 @return Size of variable in bytes in type UINTN.
189
190 **/
191 UINTN
192 DataSizeOfVariable (
193 IN VARIABLE_HEADER *Variable,
194 IN BOOLEAN AuthFlag
195 )
196 {
197 AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
198
199 AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
200 if (AuthFlag) {
201 if (AuthVariable->State == (UINT8) (-1) ||
202 AuthVariable->DataSize == (UINT32) (-1) ||
203 AuthVariable->NameSize == (UINT32) (-1) ||
204 AuthVariable->Attributes == (UINT32) (-1)) {
205 return 0;
206 }
207 return (UINTN) AuthVariable->DataSize;
208 } else {
209 if (Variable->State == (UINT8) (-1) ||
210 Variable->DataSize == (UINT32) (-1) ||
211 Variable->NameSize == (UINT32) (-1) ||
212 Variable->Attributes == (UINT32) (-1)) {
213 return 0;
214 }
215 return (UINTN) Variable->DataSize;
216 }
217 }
218
219 /**
220 This code gets the pointer to the variable name.
221
222 @param Variable Pointer to the Variable Header.
223 @param AuthFlag Authenticated variable flag.
224
225 @return A CHAR16* pointer to Variable Name.
226
227 **/
228 CHAR16 *
229 GetVariableNamePtr (
230 IN VARIABLE_HEADER *Variable,
231 IN BOOLEAN AuthFlag
232 )
233 {
234 return (CHAR16 *) ((UINTN) Variable + GetVariableHeaderSize (AuthFlag));
235 }
236
237 /**
238 This code gets the pointer to the variable guid.
239
240 @param Variable Pointer to the Variable Header.
241 @param AuthFlag Authenticated variable flag.
242
243 @return A EFI_GUID* pointer to Vendor Guid.
244
245 **/
246 EFI_GUID *
247 GetVendorGuidPtr (
248 IN VARIABLE_HEADER *Variable,
249 IN BOOLEAN AuthFlag
250 )
251 {
252 AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
253
254 AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
255 if (AuthFlag) {
256 return &AuthVariable->VendorGuid;
257 } else {
258 return &Variable->VendorGuid;
259 }
260 }
261
262 /**
263 This code gets the pointer to the variable data.
264
265 @param Variable Pointer to the Variable Header.
266 @param VariableHeader Pointer to the Variable Header that has consecutive content.
267 @param AuthFlag Authenticated variable flag.
268
269 @return A UINT8* pointer to Variable Data.
270
271 **/
272 UINT8 *
273 GetVariableDataPtr (
274 IN VARIABLE_HEADER *Variable,
275 IN VARIABLE_HEADER *VariableHeader,
276 IN BOOLEAN AuthFlag
277 )
278 {
279 UINTN Value;
280
281 //
282 // Be careful about pad size for alignment
283 //
284 Value = (UINTN) GetVariableNamePtr (Variable, AuthFlag);
285 Value += NameSizeOfVariable (VariableHeader, AuthFlag);
286 Value += GET_PAD_SIZE (NameSizeOfVariable (VariableHeader, AuthFlag));
287
288 return (UINT8 *) Value;
289 }
290
291
292 /**
293 This code gets the pointer to the next variable header.
294
295 @param StoreInfo Pointer to variable store info structure.
296 @param Variable Pointer to the Variable Header.
297 @param VariableHeader Pointer to the Variable Header that has consecutive content.
298
299 @return A VARIABLE_HEADER* pointer to next variable header.
300
301 **/
302 VARIABLE_HEADER *
303 GetNextVariablePtr (
304 IN VARIABLE_STORE_INFO *StoreInfo,
305 IN VARIABLE_HEADER *Variable,
306 IN VARIABLE_HEADER *VariableHeader
307 )
308 {
309 EFI_PHYSICAL_ADDRESS TargetAddress;
310 EFI_PHYSICAL_ADDRESS SpareAddress;
311 UINTN Value;
312
313 Value = (UINTN) GetVariableDataPtr (Variable, VariableHeader, StoreInfo->AuthFlag);
314 Value += DataSizeOfVariable (VariableHeader, StoreInfo->AuthFlag);
315 Value += GET_PAD_SIZE (DataSizeOfVariable (VariableHeader, StoreInfo->AuthFlag));
316 //
317 // Be careful about pad size for alignment
318 //
319 Value = HEADER_ALIGN (Value);
320
321 if (StoreInfo->FtwLastWriteData != NULL) {
322 TargetAddress = StoreInfo->FtwLastWriteData->TargetAddress;
323 SpareAddress = StoreInfo->FtwLastWriteData->SpareAddress;
324 if (((UINTN) Variable < (UINTN) TargetAddress) && (Value >= (UINTN) TargetAddress)) {
325 //
326 // Next variable is in spare block.
327 //
328 Value = (UINTN) SpareAddress + (Value - (UINTN) TargetAddress);
329 }
330 }
331
332 return (VARIABLE_HEADER *) Value;
333 }
334
335 /**
336 Get variable store status.
337
338 @param VarStoreHeader Pointer to the Variable Store Header.
339
340 @retval EfiRaw Variable store is raw
341 @retval EfiValid Variable store is valid
342 @retval EfiInvalid Variable store is invalid
343
344 **/
345 VARIABLE_STORE_STATUS
346 GetVariableStoreStatus (
347 IN VARIABLE_STORE_HEADER *VarStoreHeader
348 )
349 {
350 if ((CompareGuid (&VarStoreHeader->Signature, &gEfiAuthenticatedVariableGuid) ||
351 CompareGuid (&VarStoreHeader->Signature, &gEfiVariableGuid)) &&
352 VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&
353 VarStoreHeader->State == VARIABLE_STORE_HEALTHY
354 ) {
355
356 return EfiValid;
357 }
358
359 if (((UINT32 *)(&VarStoreHeader->Signature))[0] == 0xffffffff &&
360 ((UINT32 *)(&VarStoreHeader->Signature))[1] == 0xffffffff &&
361 ((UINT32 *)(&VarStoreHeader->Signature))[2] == 0xffffffff &&
362 ((UINT32 *)(&VarStoreHeader->Signature))[3] == 0xffffffff &&
363 VarStoreHeader->Size == 0xffffffff &&
364 VarStoreHeader->Format == 0xff &&
365 VarStoreHeader->State == 0xff
366 ) {
367
368 return EfiRaw;
369 } else {
370 return EfiInvalid;
371 }
372 }
373
374 /**
375 Compare two variable names, one of them may be inconsecutive.
376
377 @param StoreInfo Pointer to variable store info structure.
378 @param Name1 Pointer to one variable name.
379 @param Name2 Pointer to another variable name.
380 @param NameSize Variable name size.
381
382 @retval TRUE Name1 and Name2 are identical.
383 @retval FALSE Name1 and Name2 are not identical.
384
385 **/
386 BOOLEAN
387 CompareVariableName (
388 IN VARIABLE_STORE_INFO *StoreInfo,
389 IN CONST CHAR16 *Name1,
390 IN CONST CHAR16 *Name2,
391 IN UINTN NameSize
392 )
393 {
394 EFI_PHYSICAL_ADDRESS TargetAddress;
395 EFI_PHYSICAL_ADDRESS SpareAddress;
396 UINTN PartialNameSize;
397
398 if (StoreInfo->FtwLastWriteData != NULL) {
399 TargetAddress = StoreInfo->FtwLastWriteData->TargetAddress;
400 SpareAddress = StoreInfo->FtwLastWriteData->SpareAddress;
401 if (((UINTN) Name1 < (UINTN) TargetAddress) && (((UINTN) Name1 + NameSize) > (UINTN) TargetAddress)) {
402 //
403 // Name1 is inconsecutive.
404 //
405 PartialNameSize = (UINTN) TargetAddress - (UINTN) Name1;
406 //
407 // Partial content is in NV storage.
408 //
409 if (CompareMem ((UINT8 *) Name1, (UINT8 *) Name2, PartialNameSize) == 0) {
410 //
411 // Another partial content is in spare block.
412 //
413 if (CompareMem ((UINT8 *) (UINTN) SpareAddress, (UINT8 *) Name2 + PartialNameSize, NameSize - PartialNameSize) == 0) {
414 return TRUE;
415 }
416 }
417 return FALSE;
418 } else if (((UINTN) Name2 < (UINTN) TargetAddress) && (((UINTN) Name2 + NameSize) > (UINTN) TargetAddress)) {
419 //
420 // Name2 is inconsecutive.
421 //
422 PartialNameSize = (UINTN) TargetAddress - (UINTN) Name2;
423 //
424 // Partial content is in NV storage.
425 //
426 if (CompareMem ((UINT8 *) Name2, (UINT8 *) Name1, PartialNameSize) == 0) {
427 //
428 // Another partial content is in spare block.
429 //
430 if (CompareMem ((UINT8 *) (UINTN) SpareAddress, (UINT8 *) Name1 + PartialNameSize, NameSize - PartialNameSize) == 0) {
431 return TRUE;
432 }
433 }
434 return FALSE;
435 }
436 }
437
438 //
439 // Both Name1 and Name2 are consecutive.
440 //
441 if (CompareMem ((UINT8 *) Name1, (UINT8 *) Name2, NameSize) == 0) {
442 return TRUE;
443 }
444 return FALSE;
445 }
446
447 /**
448 This function compares a variable with variable entries in database.
449
450 @param StoreInfo Pointer to variable store info structure.
451 @param Variable Pointer to the variable in our database
452 @param VariableHeader Pointer to the Variable Header that has consecutive content.
453 @param VariableName Name of the variable to compare to 'Variable'
454 @param VendorGuid GUID of the variable to compare to 'Variable'
455 @param PtrTrack Variable Track Pointer structure that contains Variable Information.
456
457 @retval EFI_SUCCESS Found match variable
458 @retval EFI_NOT_FOUND Variable not found
459
460 **/
461 EFI_STATUS
462 CompareWithValidVariable (
463 IN VARIABLE_STORE_INFO *StoreInfo,
464 IN VARIABLE_HEADER *Variable,
465 IN VARIABLE_HEADER *VariableHeader,
466 IN CONST CHAR16 *VariableName,
467 IN CONST EFI_GUID *VendorGuid,
468 OUT VARIABLE_POINTER_TRACK *PtrTrack
469 )
470 {
471 VOID *Point;
472 EFI_GUID *TempVendorGuid;
473
474 TempVendorGuid = GetVendorGuidPtr (VariableHeader, StoreInfo->AuthFlag);
475
476 if (VariableName[0] == 0) {
477 PtrTrack->CurrPtr = Variable;
478 return EFI_SUCCESS;
479 } else {
480 //
481 // Don't use CompareGuid function here for performance reasons.
482 // Instead we compare the GUID a UINT32 at a time and branch
483 // on the first failed comparison.
484 //
485 if ((((INT32 *) VendorGuid)[0] == ((INT32 *) TempVendorGuid)[0]) &&
486 (((INT32 *) VendorGuid)[1] == ((INT32 *) TempVendorGuid)[1]) &&
487 (((INT32 *) VendorGuid)[2] == ((INT32 *) TempVendorGuid)[2]) &&
488 (((INT32 *) VendorGuid)[3] == ((INT32 *) TempVendorGuid)[3])
489 ) {
490 ASSERT (NameSizeOfVariable (VariableHeader, StoreInfo->AuthFlag) != 0);
491 Point = (VOID *) GetVariableNamePtr (Variable, StoreInfo->AuthFlag);
492 if (CompareVariableName (StoreInfo, VariableName, Point, NameSizeOfVariable (VariableHeader, StoreInfo->AuthFlag))) {
493 PtrTrack->CurrPtr = Variable;
494 return EFI_SUCCESS;
495 }
496 }
497 }
498
499 return EFI_NOT_FOUND;
500 }
501
502 /**
503 Get HOB variable store.
504
505 @param[out] StoreInfo Return the store info.
506 @param[out] VariableStoreHeader Return variable store header.
507
508 **/
509 VOID
510 GetHobVariableStore (
511 OUT VARIABLE_STORE_INFO *StoreInfo,
512 OUT VARIABLE_STORE_HEADER **VariableStoreHeader
513 )
514 {
515 EFI_HOB_GUID_TYPE *GuidHob;
516
517 //
518 // Make sure there is no more than one Variable HOB.
519 //
520 DEBUG_CODE (
521 GuidHob = GetFirstGuidHob (&gEfiAuthenticatedVariableGuid);
522 if (GuidHob != NULL) {
523 if ((GetNextGuidHob (&gEfiAuthenticatedVariableGuid, GET_NEXT_HOB (GuidHob)) != NULL)) {
524 DEBUG ((DEBUG_ERROR, "ERROR: Found two Auth Variable HOBs\n"));
525 ASSERT (FALSE);
526 } else if (GetFirstGuidHob (&gEfiVariableGuid) != NULL) {
527 DEBUG ((DEBUG_ERROR, "ERROR: Found one Auth + one Normal Variable HOBs\n"));
528 ASSERT (FALSE);
529 }
530 } else {
531 GuidHob = GetFirstGuidHob (&gEfiVariableGuid);
532 if (GuidHob != NULL) {
533 if ((GetNextGuidHob (&gEfiVariableGuid, GET_NEXT_HOB (GuidHob)) != NULL)) {
534 DEBUG ((DEBUG_ERROR, "ERROR: Found two Normal Variable HOBs\n"));
535 ASSERT (FALSE);
536 }
537 }
538 }
539 );
540
541 GuidHob = GetFirstGuidHob (&gEfiAuthenticatedVariableGuid);
542 if (GuidHob != NULL) {
543 *VariableStoreHeader = (VARIABLE_STORE_HEADER *) GET_GUID_HOB_DATA (GuidHob);
544 StoreInfo->AuthFlag = TRUE;
545 } else {
546 GuidHob = GetFirstGuidHob (&gEfiVariableGuid);
547 if (GuidHob != NULL) {
548 *VariableStoreHeader = (VARIABLE_STORE_HEADER *) GET_GUID_HOB_DATA (GuidHob);
549 StoreInfo->AuthFlag = FALSE;
550 }
551 }
552 }
553
554 /**
555 Return the variable store header and the store info based on the Index.
556
557 @param Type The type of the variable store.
558 @param StoreInfo Return the store info.
559
560 @return Pointer to the variable store header.
561 **/
562 VARIABLE_STORE_HEADER *
563 GetVariableStore (
564 IN VARIABLE_STORE_TYPE Type,
565 OUT VARIABLE_STORE_INFO *StoreInfo
566 )
567 {
568 EFI_HOB_GUID_TYPE *GuidHob;
569 EFI_FIRMWARE_VOLUME_HEADER *FvHeader;
570 VARIABLE_STORE_HEADER *VariableStoreHeader;
571 EFI_PHYSICAL_ADDRESS NvStorageBase;
572 UINT32 NvStorageSize;
573 FAULT_TOLERANT_WRITE_LAST_WRITE_DATA *FtwLastWriteData;
574 UINT32 BackUpOffset;
575
576 StoreInfo->IndexTable = NULL;
577 StoreInfo->FtwLastWriteData = NULL;
578 StoreInfo->AuthFlag = FALSE;
579 VariableStoreHeader = NULL;
580 switch (Type) {
581 case VariableStoreTypeHob:
582 GetHobVariableStore (StoreInfo, &VariableStoreHeader);
583
584 break;
585
586 case VariableStoreTypeNv:
587 if (GetBootModeHob () != BOOT_IN_RECOVERY_MODE) {
588 //
589 // The content of NV storage for variable is not reliable in recovery boot mode.
590 //
591
592 NvStorageSize = PcdGet32 (PcdFlashNvStorageVariableSize);
593 NvStorageBase = (EFI_PHYSICAL_ADDRESS) (PcdGet64 (PcdFlashNvStorageVariableBase64) != 0 ?
594 PcdGet64 (PcdFlashNvStorageVariableBase64) :
595 PcdGet32 (PcdFlashNvStorageVariableBase)
596 );
597 //
598 // First let FvHeader point to NV storage base.
599 //
600 FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) NvStorageBase;
601
602 //
603 // Check the FTW last write data hob.
604 //
605 BackUpOffset = 0;
606 GuidHob = GetFirstGuidHob (&gEdkiiFaultTolerantWriteGuid);
607 if (GuidHob != NULL) {
608 FtwLastWriteData = (FAULT_TOLERANT_WRITE_LAST_WRITE_DATA *) GET_GUID_HOB_DATA (GuidHob);
609 if (FtwLastWriteData->TargetAddress == NvStorageBase) {
610 //
611 // Let FvHeader point to spare block.
612 //
613 FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) FtwLastWriteData->SpareAddress;
614 DEBUG ((EFI_D_INFO, "PeiVariable: NV storage is backed up in spare block: 0x%x\n", (UINTN) FtwLastWriteData->SpareAddress));
615 } else if ((FtwLastWriteData->TargetAddress > NvStorageBase) && (FtwLastWriteData->TargetAddress < (NvStorageBase + NvStorageSize))) {
616 StoreInfo->FtwLastWriteData = FtwLastWriteData;
617 //
618 // Flash NV storage from the offset is backed up in spare block.
619 //
620 BackUpOffset = (UINT32) (FtwLastWriteData->TargetAddress - NvStorageBase);
621 DEBUG ((EFI_D_INFO, "PeiVariable: High partial NV storage from offset: %x is backed up in spare block: 0x%x\n", BackUpOffset, (UINTN) FtwLastWriteData->SpareAddress));
622 //
623 // At least one block data in flash NV storage is still valid, so still leave FvHeader point to NV storage base.
624 //
625 }
626 }
627
628 //
629 // Check if the Firmware Volume is not corrupted
630 //
631 if ((FvHeader->Signature != EFI_FVH_SIGNATURE) || (!CompareGuid (&gEfiSystemNvDataFvGuid, &FvHeader->FileSystemGuid))) {
632 DEBUG ((EFI_D_ERROR, "Firmware Volume for Variable Store is corrupted\n"));
633 break;
634 }
635
636 VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINT8 *) FvHeader + FvHeader->HeaderLength);
637
638 StoreInfo->AuthFlag = (BOOLEAN) (CompareGuid (&VariableStoreHeader->Signature, &gEfiAuthenticatedVariableGuid));
639
640 GuidHob = GetFirstGuidHob (&gEfiVariableIndexTableGuid);
641 if (GuidHob != NULL) {
642 StoreInfo->IndexTable = GET_GUID_HOB_DATA (GuidHob);
643 } else {
644 //
645 // If it's the first time to access variable region in flash, create a guid hob to record
646 // VAR_ADDED type variable info.
647 // Note that as the resource of PEI phase is limited, only store the limited number of
648 // VAR_ADDED type variables to reduce access time.
649 //
650 StoreInfo->IndexTable = (VARIABLE_INDEX_TABLE *) BuildGuidHob (&gEfiVariableIndexTableGuid, sizeof (VARIABLE_INDEX_TABLE));
651 StoreInfo->IndexTable->Length = 0;
652 StoreInfo->IndexTable->StartPtr = GetStartPointer (VariableStoreHeader);
653 StoreInfo->IndexTable->EndPtr = GetEndPointer (VariableStoreHeader);
654 StoreInfo->IndexTable->GoneThrough = 0;
655 }
656 }
657 break;
658
659 default:
660 ASSERT (FALSE);
661 break;
662 }
663
664 StoreInfo->VariableStoreHeader = VariableStoreHeader;
665 return VariableStoreHeader;
666 }
667
668 /**
669 Get variable header that has consecutive content.
670
671 @param StoreInfo Pointer to variable store info structure.
672 @param Variable Pointer to the Variable Header.
673 @param VariableHeader Pointer to Pointer to the Variable Header that has consecutive content.
674
675 @retval TRUE Variable header is valid.
676 @retval FALSE Variable header is not valid.
677
678 **/
679 BOOLEAN
680 GetVariableHeader (
681 IN VARIABLE_STORE_INFO *StoreInfo,
682 IN VARIABLE_HEADER *Variable,
683 OUT VARIABLE_HEADER **VariableHeader
684 )
685 {
686 EFI_PHYSICAL_ADDRESS TargetAddress;
687 EFI_PHYSICAL_ADDRESS SpareAddress;
688 EFI_HOB_GUID_TYPE *GuidHob;
689 UINTN PartialHeaderSize;
690
691 if (Variable == NULL) {
692 return FALSE;
693 }
694
695 //
696 // First assume variable header pointed by Variable is consecutive.
697 //
698 *VariableHeader = Variable;
699
700 if (StoreInfo->FtwLastWriteData != NULL) {
701 TargetAddress = StoreInfo->FtwLastWriteData->TargetAddress;
702 SpareAddress = StoreInfo->FtwLastWriteData->SpareAddress;
703 if (((UINTN) Variable > (UINTN) SpareAddress) &&
704 (((UINTN) Variable - (UINTN) SpareAddress + (UINTN) TargetAddress) >= (UINTN) GetEndPointer (StoreInfo->VariableStoreHeader))) {
705 //
706 // Reach the end of variable store.
707 //
708 return FALSE;
709 }
710 if (((UINTN) Variable < (UINTN) TargetAddress) && (((UINTN) Variable + GetVariableHeaderSize (StoreInfo->AuthFlag)) > (UINTN) TargetAddress)) {
711 //
712 // Variable header pointed by Variable is inconsecutive,
713 // create a guid hob to combine the two partial variable header content together.
714 //
715 GuidHob = GetFirstGuidHob (&gEfiCallerIdGuid);
716 if (GuidHob != NULL) {
717 *VariableHeader = (VARIABLE_HEADER *) GET_GUID_HOB_DATA (GuidHob);
718 } else {
719 *VariableHeader = (VARIABLE_HEADER *) BuildGuidHob (&gEfiCallerIdGuid, GetVariableHeaderSize (StoreInfo->AuthFlag));
720 PartialHeaderSize = (UINTN) TargetAddress - (UINTN) Variable;
721 //
722 // Partial content is in NV storage.
723 //
724 CopyMem ((UINT8 *) *VariableHeader, (UINT8 *) Variable, PartialHeaderSize);
725 //
726 // Another partial content is in spare block.
727 //
728 CopyMem ((UINT8 *) *VariableHeader + PartialHeaderSize, (UINT8 *) (UINTN) SpareAddress, GetVariableHeaderSize (StoreInfo->AuthFlag) - PartialHeaderSize);
729 }
730 }
731 } else {
732 if (Variable >= GetEndPointer (StoreInfo->VariableStoreHeader)) {
733 //
734 // Reach the end of variable store.
735 //
736 return FALSE;
737 }
738 }
739
740 return IsValidVariableHeader (*VariableHeader);
741 }
742
743 /**
744 Get variable name or data to output buffer.
745
746 @param StoreInfo Pointer to variable store info structure.
747 @param NameOrData Pointer to the variable name/data that may be inconsecutive.
748 @param Size Variable name/data size.
749 @param Buffer Pointer to output buffer to hold the variable name/data.
750
751 **/
752 VOID
753 GetVariableNameOrData (
754 IN VARIABLE_STORE_INFO *StoreInfo,
755 IN UINT8 *NameOrData,
756 IN UINTN Size,
757 OUT UINT8 *Buffer
758 )
759 {
760 EFI_PHYSICAL_ADDRESS TargetAddress;
761 EFI_PHYSICAL_ADDRESS SpareAddress;
762 UINTN PartialSize;
763
764 if (StoreInfo->FtwLastWriteData != NULL) {
765 TargetAddress = StoreInfo->FtwLastWriteData->TargetAddress;
766 SpareAddress = StoreInfo->FtwLastWriteData->SpareAddress;
767 if (((UINTN) NameOrData < (UINTN) TargetAddress) && (((UINTN) NameOrData + Size) > (UINTN) TargetAddress)) {
768 //
769 // Variable name/data is inconsecutive.
770 //
771 PartialSize = (UINTN) TargetAddress - (UINTN) NameOrData;
772 //
773 // Partial content is in NV storage.
774 //
775 CopyMem (Buffer, NameOrData, PartialSize);
776 //
777 // Another partial content is in spare block.
778 //
779 CopyMem (Buffer + PartialSize, (UINT8 *) (UINTN) SpareAddress, Size - PartialSize);
780 return;
781 }
782 }
783
784 //
785 // Variable name/data is consecutive.
786 //
787 CopyMem (Buffer, NameOrData, Size);
788 }
789
790 /**
791 Find the variable in the specified variable store.
792
793 @param StoreInfo Pointer to the store info structure.
794 @param VariableName Name of the variable to be found
795 @param VendorGuid Vendor GUID to be found.
796 @param PtrTrack Variable Track Pointer structure that contains Variable Information.
797
798 @retval EFI_SUCCESS Variable found successfully
799 @retval EFI_NOT_FOUND Variable not found
800 @retval EFI_INVALID_PARAMETER Invalid variable name
801
802 **/
803 EFI_STATUS
804 FindVariableEx (
805 IN VARIABLE_STORE_INFO *StoreInfo,
806 IN CONST CHAR16 *VariableName,
807 IN CONST EFI_GUID *VendorGuid,
808 OUT VARIABLE_POINTER_TRACK *PtrTrack
809 )
810 {
811 VARIABLE_HEADER *Variable;
812 VARIABLE_HEADER *LastVariable;
813 VARIABLE_HEADER *MaxIndex;
814 UINTN Index;
815 UINTN Offset;
816 BOOLEAN StopRecord;
817 VARIABLE_HEADER *InDeletedVariable;
818 VARIABLE_STORE_HEADER *VariableStoreHeader;
819 VARIABLE_INDEX_TABLE *IndexTable;
820 VARIABLE_HEADER *VariableHeader;
821
822 VariableStoreHeader = StoreInfo->VariableStoreHeader;
823
824 if (VariableStoreHeader == NULL) {
825 return EFI_INVALID_PARAMETER;
826 }
827
828 if (GetVariableStoreStatus (VariableStoreHeader) != EfiValid) {
829 return EFI_UNSUPPORTED;
830 }
831
832 if (~VariableStoreHeader->Size == 0) {
833 return EFI_NOT_FOUND;
834 }
835
836 IndexTable = StoreInfo->IndexTable;
837 PtrTrack->StartPtr = GetStartPointer (VariableStoreHeader);
838 PtrTrack->EndPtr = GetEndPointer (VariableStoreHeader);
839
840 InDeletedVariable = NULL;
841
842 //
843 // No Variable Address equals zero, so 0 as initial value is safe.
844 //
845 MaxIndex = NULL;
846 VariableHeader = NULL;
847
848 if (IndexTable != NULL) {
849 //
850 // traverse the variable index table to look for varible.
851 // The IndexTable->Index[Index] records the distance of two neighbouring VAR_ADDED type variables.
852 //
853 for (Offset = 0, Index = 0; Index < IndexTable->Length; Index++) {
854 ASSERT (Index < sizeof (IndexTable->Index) / sizeof (IndexTable->Index[0]));
855 Offset += IndexTable->Index[Index];
856 MaxIndex = (VARIABLE_HEADER *) ((UINT8 *) IndexTable->StartPtr + Offset);
857 GetVariableHeader (StoreInfo, MaxIndex, &VariableHeader);
858 if (CompareWithValidVariable (StoreInfo, MaxIndex, VariableHeader, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {
859 if (VariableHeader->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
860 InDeletedVariable = PtrTrack->CurrPtr;
861 } else {
862 return EFI_SUCCESS;
863 }
864 }
865 }
866
867 if (IndexTable->GoneThrough != 0) {
868 //
869 // If the table has all the existing variables indexed, return.
870 //
871 PtrTrack->CurrPtr = InDeletedVariable;
872 return (PtrTrack->CurrPtr == NULL) ? EFI_NOT_FOUND : EFI_SUCCESS;
873 }
874 }
875
876 if (MaxIndex != NULL) {
877 //
878 // HOB exists but the variable cannot be found in HOB
879 // If not found in HOB, then let's start from the MaxIndex we've found.
880 //
881 Variable = GetNextVariablePtr (StoreInfo, MaxIndex, VariableHeader);
882 LastVariable = MaxIndex;
883 } else {
884 //
885 // Start Pointers for the variable.
886 // Actual Data Pointer where data can be written.
887 //
888 Variable = PtrTrack->StartPtr;
889 LastVariable = PtrTrack->StartPtr;
890 }
891
892 //
893 // Find the variable by walk through variable store
894 //
895 StopRecord = FALSE;
896 while (GetVariableHeader (StoreInfo, Variable, &VariableHeader)) {
897 if (VariableHeader->State == VAR_ADDED || VariableHeader->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
898 //
899 // Record Variable in VariableIndex HOB
900 //
901 if ((IndexTable != NULL) && !StopRecord) {
902 Offset = (UINTN) Variable - (UINTN) LastVariable;
903 if ((Offset > 0x0FFFF) || (IndexTable->Length == sizeof (IndexTable->Index) / sizeof (IndexTable->Index[0]))) {
904 //
905 // Stop to record if the distance of two neighbouring VAR_ADDED variable is larger than the allowable scope(UINT16),
906 // or the record buffer is full.
907 //
908 StopRecord = TRUE;
909 } else {
910 IndexTable->Index[IndexTable->Length++] = (UINT16) Offset;
911 LastVariable = Variable;
912 }
913 }
914
915 if (CompareWithValidVariable (StoreInfo, Variable, VariableHeader, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {
916 if (VariableHeader->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
917 InDeletedVariable = PtrTrack->CurrPtr;
918 } else {
919 return EFI_SUCCESS;
920 }
921 }
922 }
923
924 Variable = GetNextVariablePtr (StoreInfo, Variable, VariableHeader);
925 }
926 //
927 // If gone through the VariableStore, that means we never find in Firmware any more.
928 //
929 if ((IndexTable != NULL) && !StopRecord) {
930 IndexTable->GoneThrough = 1;
931 }
932
933 PtrTrack->CurrPtr = InDeletedVariable;
934
935 return (PtrTrack->CurrPtr == NULL) ? EFI_NOT_FOUND : EFI_SUCCESS;
936 }
937
938 /**
939 Find the variable in HOB and Non-Volatile variable storages.
940
941 @param VariableName Name of the variable to be found
942 @param VendorGuid Vendor GUID to be found.
943 @param PtrTrack Variable Track Pointer structure that contains Variable Information.
944 @param StoreInfo Return the store info.
945
946 @retval EFI_SUCCESS Variable found successfully
947 @retval EFI_NOT_FOUND Variable not found
948 @retval EFI_INVALID_PARAMETER Invalid variable name
949 **/
950 EFI_STATUS
951 FindVariable (
952 IN CONST CHAR16 *VariableName,
953 IN CONST EFI_GUID *VendorGuid,
954 OUT VARIABLE_POINTER_TRACK *PtrTrack,
955 OUT VARIABLE_STORE_INFO *StoreInfo
956 )
957 {
958 EFI_STATUS Status;
959 VARIABLE_STORE_TYPE Type;
960
961 if (VariableName[0] != 0 && VendorGuid == NULL) {
962 return EFI_INVALID_PARAMETER;
963 }
964
965 for (Type = (VARIABLE_STORE_TYPE) 0; Type < VariableStoreTypeMax; Type++) {
966 GetVariableStore (Type, StoreInfo);
967 Status = FindVariableEx (
968 StoreInfo,
969 VariableName,
970 VendorGuid,
971 PtrTrack
972 );
973 if (!EFI_ERROR (Status)) {
974 return Status;
975 }
976 }
977
978 return EFI_NOT_FOUND;
979 }
980
981 /**
982 This service retrieves a variable's value using its name and GUID.
983
984 Read the specified variable from the UEFI variable store. If the Data
985 buffer is too small to hold the contents of the variable, the error
986 EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer
987 size to obtain the data.
988
989 @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
990 @param VariableName A pointer to a null-terminated string that is the variable's name.
991 @param VariableGuid A pointer to an EFI_GUID that is the variable's GUID. The combination of
992 VariableGuid and VariableName must be unique.
993 @param Attributes If non-NULL, on return, points to the variable's attributes.
994 @param DataSize On entry, points to the size in bytes of the Data buffer.
995 On return, points to the size of the data returned in Data.
996 @param Data Points to the buffer which will hold the returned variable value.
997 May be NULL with a zero DataSize in order to determine the size of the buffer needed.
998
999 @retval EFI_SUCCESS The variable was read successfully.
1000 @retval EFI_NOT_FOUND The variable was be found.
1001 @retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the resulting data.
1002 DataSize is updated with the size required for
1003 the specified variable.
1004 @retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.
1005 @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.
1006
1007 **/
1008 EFI_STATUS
1009 EFIAPI
1010 PeiGetVariable (
1011 IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
1012 IN CONST CHAR16 *VariableName,
1013 IN CONST EFI_GUID *VariableGuid,
1014 OUT UINT32 *Attributes,
1015 IN OUT UINTN *DataSize,
1016 OUT VOID *Data OPTIONAL
1017 )
1018 {
1019 VARIABLE_POINTER_TRACK Variable;
1020 UINTN VarDataSize;
1021 EFI_STATUS Status;
1022 VARIABLE_STORE_INFO StoreInfo;
1023 VARIABLE_HEADER *VariableHeader;
1024
1025 if (VariableName == NULL || VariableGuid == NULL || DataSize == NULL) {
1026 return EFI_INVALID_PARAMETER;
1027 }
1028
1029 if (VariableName[0] == 0) {
1030 return EFI_NOT_FOUND;
1031 }
1032
1033 VariableHeader = NULL;
1034
1035 //
1036 // Find existing variable
1037 //
1038 Status = FindVariable (VariableName, VariableGuid, &Variable, &StoreInfo);
1039 if (EFI_ERROR (Status)) {
1040 return Status;
1041 }
1042 GetVariableHeader (&StoreInfo, Variable.CurrPtr, &VariableHeader);
1043
1044 //
1045 // Get data size
1046 //
1047 VarDataSize = DataSizeOfVariable (VariableHeader, StoreInfo.AuthFlag);
1048 if (*DataSize >= VarDataSize) {
1049 if (Data == NULL) {
1050 return EFI_INVALID_PARAMETER;
1051 }
1052
1053 GetVariableNameOrData (&StoreInfo, GetVariableDataPtr (Variable.CurrPtr, VariableHeader, StoreInfo.AuthFlag), VarDataSize, Data);
1054
1055 if (Attributes != NULL) {
1056 *Attributes = VariableHeader->Attributes;
1057 }
1058
1059 *DataSize = VarDataSize;
1060 return EFI_SUCCESS;
1061 } else {
1062 *DataSize = VarDataSize;
1063 return EFI_BUFFER_TOO_SMALL;
1064 }
1065 }
1066
1067 /**
1068 Return the next variable name and GUID.
1069
1070 This function is called multiple times to retrieve the VariableName
1071 and VariableGuid of all variables currently available in the system.
1072 On each call, the previous results are passed into the interface,
1073 and, on return, the interface returns the data for the next
1074 interface. When the entire variable list has been returned,
1075 EFI_NOT_FOUND is returned.
1076
1077 @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
1078
1079 @param VariableNameSize On entry, points to the size of the buffer pointed to by VariableName.
1080 On return, the size of the variable name buffer.
1081 @param VariableName On entry, a pointer to a null-terminated string that is the variable's name.
1082 On return, points to the next variable's null-terminated name string.
1083 @param VariableGuid On entry, a pointer to an EFI_GUID that is the variable's GUID.
1084 On return, a pointer to the next variable's GUID.
1085
1086 @retval EFI_SUCCESS The variable was read successfully.
1087 @retval EFI_NOT_FOUND The variable could not be found.
1088 @retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the resulting
1089 data. VariableNameSize is updated with the size
1090 required for the specified variable.
1091 @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or
1092 VariableNameSize is NULL.
1093 @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.
1094
1095 **/
1096 EFI_STATUS
1097 EFIAPI
1098 PeiGetNextVariableName (
1099 IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
1100 IN OUT UINTN *VariableNameSize,
1101 IN OUT CHAR16 *VariableName,
1102 IN OUT EFI_GUID *VariableGuid
1103 )
1104 {
1105 VARIABLE_STORE_TYPE Type;
1106 VARIABLE_POINTER_TRACK Variable;
1107 VARIABLE_POINTER_TRACK VariableInHob;
1108 VARIABLE_POINTER_TRACK VariablePtrTrack;
1109 UINTN VarNameSize;
1110 EFI_STATUS Status;
1111 VARIABLE_STORE_HEADER *VariableStoreHeader[VariableStoreTypeMax];
1112 VARIABLE_HEADER *VariableHeader;
1113 VARIABLE_STORE_INFO StoreInfo;
1114 VARIABLE_STORE_INFO StoreInfoForNv;
1115 VARIABLE_STORE_INFO StoreInfoForHob;
1116
1117 if (VariableName == NULL || VariableGuid == NULL || VariableNameSize == NULL) {
1118 return EFI_INVALID_PARAMETER;
1119 }
1120
1121 VariableHeader = NULL;
1122
1123 Status = FindVariable (VariableName, VariableGuid, &Variable, &StoreInfo);
1124 if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {
1125 return Status;
1126 }
1127
1128 if (VariableName[0] != 0) {
1129 //
1130 // If variable name is not NULL, get next variable
1131 //
1132 GetVariableHeader (&StoreInfo, Variable.CurrPtr, &VariableHeader);
1133 Variable.CurrPtr = GetNextVariablePtr (&StoreInfo, Variable.CurrPtr, VariableHeader);
1134 }
1135
1136 VariableStoreHeader[VariableStoreTypeHob] = GetVariableStore (VariableStoreTypeHob, &StoreInfoForHob);
1137 VariableStoreHeader[VariableStoreTypeNv] = GetVariableStore (VariableStoreTypeNv, &StoreInfoForNv);
1138
1139 while (TRUE) {
1140 //
1141 // Switch from HOB to Non-Volatile.
1142 //
1143 while (!GetVariableHeader (&StoreInfo, Variable.CurrPtr, &VariableHeader)) {
1144 //
1145 // Find current storage index
1146 //
1147 for (Type = (VARIABLE_STORE_TYPE) 0; Type < VariableStoreTypeMax; Type++) {
1148 if ((VariableStoreHeader[Type] != NULL) && (Variable.StartPtr == GetStartPointer (VariableStoreHeader[Type]))) {
1149 break;
1150 }
1151 }
1152 ASSERT (Type < VariableStoreTypeMax);
1153 //
1154 // Switch to next storage
1155 //
1156 for (Type++; Type < VariableStoreTypeMax; Type++) {
1157 if (VariableStoreHeader[Type] != NULL) {
1158 break;
1159 }
1160 }
1161 //
1162 // Capture the case that
1163 // 1. current storage is the last one, or
1164 // 2. no further storage
1165 //
1166 if (Type == VariableStoreTypeMax) {
1167 return EFI_NOT_FOUND;
1168 }
1169 Variable.StartPtr = GetStartPointer (VariableStoreHeader[Type]);
1170 Variable.EndPtr = GetEndPointer (VariableStoreHeader[Type]);
1171 Variable.CurrPtr = Variable.StartPtr;
1172 GetVariableStore (Type, &StoreInfo);
1173 }
1174
1175 if (VariableHeader->State == VAR_ADDED || VariableHeader->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
1176 if (VariableHeader->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
1177 //
1178 // If it is a IN_DELETED_TRANSITION variable,
1179 // and there is also a same ADDED one at the same time,
1180 // don't return it.
1181 //
1182 Status = FindVariableEx (
1183 &StoreInfo,
1184 GetVariableNamePtr (Variable.CurrPtr, StoreInfo.AuthFlag),
1185 GetVendorGuidPtr (VariableHeader, StoreInfo.AuthFlag),
1186 &VariablePtrTrack
1187 );
1188 if (!EFI_ERROR (Status) && VariablePtrTrack.CurrPtr != Variable.CurrPtr) {
1189 Variable.CurrPtr = GetNextVariablePtr (&StoreInfo, Variable.CurrPtr, VariableHeader);
1190 continue;
1191 }
1192 }
1193
1194 //
1195 // Don't return NV variable when HOB overrides it
1196 //
1197 if ((VariableStoreHeader[VariableStoreTypeHob] != NULL) && (VariableStoreHeader[VariableStoreTypeNv] != NULL) &&
1198 (Variable.StartPtr == GetStartPointer (VariableStoreHeader[VariableStoreTypeNv]))
1199 ) {
1200 Status = FindVariableEx (
1201 &StoreInfoForHob,
1202 GetVariableNamePtr (Variable.CurrPtr, StoreInfo.AuthFlag),
1203 GetVendorGuidPtr (VariableHeader, StoreInfo.AuthFlag),
1204 &VariableInHob
1205 );
1206 if (!EFI_ERROR (Status)) {
1207 Variable.CurrPtr = GetNextVariablePtr (&StoreInfo, Variable.CurrPtr, VariableHeader);
1208 continue;
1209 }
1210 }
1211
1212 VarNameSize = NameSizeOfVariable (VariableHeader, StoreInfo.AuthFlag);
1213 ASSERT (VarNameSize != 0);
1214
1215 if (VarNameSize <= *VariableNameSize) {
1216 GetVariableNameOrData (&StoreInfo, (UINT8 *) GetVariableNamePtr (Variable.CurrPtr, StoreInfo.AuthFlag), VarNameSize, (UINT8 *) VariableName);
1217
1218 CopyMem (VariableGuid, GetVendorGuidPtr (VariableHeader, StoreInfo.AuthFlag), sizeof (EFI_GUID));
1219
1220 Status = EFI_SUCCESS;
1221 } else {
1222 Status = EFI_BUFFER_TOO_SMALL;
1223 }
1224
1225 *VariableNameSize = VarNameSize;
1226 //
1227 // Variable is found
1228 //
1229 return Status;
1230 } else {
1231 Variable.CurrPtr = GetNextVariablePtr (&StoreInfo, Variable.CurrPtr, VariableHeader);
1232 }
1233 }
1234 }
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