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1/** @file\r
2 Framework PEIM to provide the Variable functionality\r
3 \r
4Copyright (c) 2006 - 2008 Intel Corporation. <BR>\r
5All rights reserved. This program and the accompanying materials\r
6are licensed and made available under the terms and conditions of the BSD License\r
7which accompanies this distribution. The full text of the license may be found at\r
8http://opensource.org/licenses/bsd-license.php\r
9\r
10THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
11WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
12Module Name:\r
13\r
14**/\r
15\r
16\r
17#include "Variable.h"\r
18\r
19//\r
20// Module globals\r
21//\r
22EFI_PEI_READ_ONLY_VARIABLE_PPI mVariablePpi = {\r
23 PeiGetVariable,\r
24 PeiGetNextVariableName\r
25};\r
26\r
27EFI_PEI_READ_ONLY_VARIABLE2_PPI mVariable2Ppi = {\r
28 PeiGetVariable2,\r
29 PeiGetNextVariableName2\r
30};\r
31\r
32EFI_PEI_PPI_DESCRIPTOR mPpiListVariable[] = {\r
33 {\r
34 (EFI_PEI_PPI_DESCRIPTOR_PPI),\r
35 &gEfiPeiReadOnlyVariable2PpiGuid,\r
36 &mVariable2Ppi\r
37 },\r
38 {\r
39 (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),\r
40 &gEfiPeiReadOnlyVariablePpiGuid,\r
41 &mVariablePpi\r
42 }\r
43};\r
44\r
45EFI_GUID mEfiVariableIndexTableGuid = EFI_VARIABLE_INDEX_TABLE_GUID;\r
46\r
47/**\r
48 Provide the functionality of the variable services.\r
49\r
50 @param FileHandle Handle of the file being invoked.\r
51 @param PeiServices Describes the list of possible PEI Services.\r
52\r
53 @return EFI_SUCCESS If the interface could be successfully installed.\r
54 @return EFI_UNSUPPORTED If current boot path is in recovery mode, then does not\r
55 install this interface.\r
56\r
57**/\r
58EFI_STATUS\r
59EFIAPI\r
60PeimInitializeVariableServices (\r
61 IN EFI_PEI_FILE_HANDLE FileHandle,\r
62 IN CONST EFI_PEI_SERVICES **PeiServices\r
63 )\r
64{\r
65 EFI_BOOT_MODE BootMode;\r
66 EFI_STATUS Status;\r
67\r
68 //\r
69 // Check if this is recovery boot path. If no, publish the variable access capability\r
70 // to other modules. If yes, the content of variable area is not reliable. Therefore,\r
71 // in this case we should not provide variable service to other pei modules. \r
72 // \r
73 Status = (*PeiServices)->GetBootMode (PeiServices, &BootMode);\r
74 ASSERT_EFI_ERROR (Status);\r
75 \r
76 if (BootMode == BOOT_IN_RECOVERY_MODE) {\r
77 return EFI_UNSUPPORTED;\r
78 }\r
79 \r
80 return (**PeiServices).InstallPpi (PeiServices, &mPpiListVariable[0]);\r
81\r
82}\r
83\r
84/**\r
85 This code gets the pointer to the first variable memory pointer byte\r
86\r
87 @param VarStoreHeader Pointer to the Variable Store Header.\r
88\r
89 @return VARIABLE_HEADER* Pointer to last unavailable Variable Header\r
90\r
91**/\r
92VARIABLE_HEADER *\r
93GetStartPointer (\r
94 IN VARIABLE_STORE_HEADER *VarStoreHeader\r
95 )\r
96{\r
97 //\r
98 // The end of variable store\r
99 //\r
100 return (VARIABLE_HEADER *) HEADER_ALIGN (VarStoreHeader + 1);\r
101}\r
102\r
103/**\r
104 This code gets the pointer to the last variable memory pointer byte\r
105\r
106 @param VarStoreHeader Pointer to the Variable Store Header.\r
107\r
108 @return VARIABLE_HEADER* Pointer to last unavailable Variable Header\r
109\r
110**/\r
111VARIABLE_HEADER *\r
112GetEndPointer (\r
113 IN VARIABLE_STORE_HEADER *VarStoreHeader\r
114 )\r
115\r
116{\r
117 //\r
118 // The end of variable store\r
119 //\r
120 return (VARIABLE_HEADER *) HEADER_ALIGN ((UINTN) VarStoreHeader + VarStoreHeader->Size);\r
121}\r
122\r
123/**\r
124\r
125 This code checks if variable header is valid or not.\r
126\r
127 @param Variable Pointer to the Variable Header.\r
128\r
129 @retval TRUE Variable header is valid.\r
130 @retval FALSE Variable header is not valid.\r
131\r
132**/\r
133BOOLEAN\r
134EFIAPI\r
135IsValidVariableHeader (\r
136 IN VARIABLE_HEADER *Variable\r
137 )\r
138{\r
139 if (Variable == NULL || Variable->StartId != VARIABLE_DATA ) {\r
140 return FALSE;\r
141 }\r
142\r
143 return TRUE;\r
144}\r
145\r
146/**\r
147 This code gets the size of name of variable.\r
148\r
149 @param Variable Pointer to the Variable Header.\r
150\r
151 @return UINTN Size of variable in bytes\r
152\r
153**/\r
154UINTN\r
155NameSizeOfVariable (\r
156 IN VARIABLE_HEADER *Variable\r
157 )\r
158{\r
159 if (Variable->State == (UINT8) (-1) ||\r
160 Variable->DataSize == (UINT32) -1 ||\r
161 Variable->NameSize == (UINT32) -1 ||\r
162 Variable->Attributes == (UINT32) -1) {\r
163 return 0;\r
164 }\r
165 return (UINTN) Variable->NameSize;\r
166}\r
167\r
168/**\r
169 This code gets the size of name of variable.\r
170\r
171 @param Variable Pointer to the Variable Header.\r
172\r
173 @return UINTN Size of variable in bytes\r
174\r
175**/\r
176UINTN\r
177DataSizeOfVariable (\r
178 IN VARIABLE_HEADER *Variable\r
179 )\r
180{\r
181 if (Variable->State == (UINT8) -1 ||\r
182 Variable->DataSize == (UINT32) -1 ||\r
183 Variable->NameSize == (UINT32) -1 ||\r
184 Variable->Attributes == (UINT32) -1) {\r
185 return 0;\r
186 }\r
187 return (UINTN) Variable->DataSize;\r
188}\r
189\r
190/**\r
191 This code gets the pointer to the variable name.\r
192\r
193 @param Variable Pointer to the Variable Header.\r
194\r
195 @return CHAR16* Pointer to Variable Name\r
196\r
197**/\r
198CHAR16 *\r
199GetVariableNamePtr (\r
200 IN VARIABLE_HEADER *Variable\r
201 )\r
202\r
203{\r
204\r
205 return (CHAR16 *) (Variable + 1);\r
206}\r
207\r
208/**\r
209 This code gets the pointer to the variable data.\r
210\r
211 @param Variable Pointer to the Variable Header.\r
212\r
213 @return UINT8* Pointer to Variable Data\r
214\r
215**/\r
216UINT8 *\r
217GetVariableDataPtr (\r
218 IN VARIABLE_HEADER *Variable\r
219 )\r
220{\r
221 UINTN Value;\r
222 \r
223 //\r
224 // Be careful about pad size for alignment\r
225 //\r
226 Value = (UINTN) GetVariableNamePtr (Variable);\r
227 Value += NameSizeOfVariable (Variable);\r
228 Value += GET_PAD_SIZE (NameSizeOfVariable (Variable));\r
229\r
230 return (UINT8 *) Value;\r
231}\r
232\r
233/**\r
234 This code gets the pointer to the next variable header.\r
235\r
236 @param Variable Pointer to the Variable Header.\r
237\r
238 @return VARIABLE_HEADER* Pointer to next variable header.\r
239\r
240**/\r
241VARIABLE_HEADER *\r
242GetNextVariablePtr (\r
243 IN VARIABLE_HEADER *Variable\r
244 )\r
245\r
246{\r
247 UINTN Value;\r
248\r
249 if (!IsValidVariableHeader (Variable)) {\r
250 return NULL;\r
251 }\r
252\r
253 Value = (UINTN) GetVariableDataPtr (Variable);\r
254 Value += DataSizeOfVariable (Variable);\r
255 Value += GET_PAD_SIZE (DataSizeOfVariable (Variable));\r
256\r
257 //\r
258 // Be careful about pad size for alignment\r
259 //\r
260 return (VARIABLE_HEADER *) HEADER_ALIGN (Value);\r
261}\r
262\r
263/**\r
264 This code gets the pointer to the variable name.\r
265\r
266 @param VarStoreHeader Pointer to the Variable Store Header.\r
267\r
268 @retval EfiRaw Variable store is raw\r
269 @retval EfiValid Variable store is valid\r
270 @retval EfiInvalid Variable store is invalid\r
271\r
272**/\r
273VARIABLE_STORE_STATUS\r
274EFIAPI\r
275GetVariableStoreStatus (\r
276 IN VARIABLE_STORE_HEADER *VarStoreHeader\r
277 )\r
278\r
279{\r
280 if (VarStoreHeader->Signature == VARIABLE_STORE_SIGNATURE &&\r
281 VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&\r
282 VarStoreHeader->State == VARIABLE_STORE_HEALTHY\r
283 ) {\r
284\r
285 return EfiValid;\r
286 }\r
287\r
288 if (VarStoreHeader->Signature == 0xffffffff &&\r
289 VarStoreHeader->Size == 0xffffffff &&\r
290 VarStoreHeader->Format == 0xff &&\r
291 VarStoreHeader->State == 0xff\r
292 ) {\r
293\r
294 return EfiRaw;\r
295 } else {\r
296 return EfiInvalid;\r
297 }\r
298}\r
299\r
300/**\r
301 This function compares a variable with variable entries in database\r
302\r
303 @param Variable - Pointer to the variable in our database\r
304 @param VariableName - Name of the variable to compare to 'Variable'\r
305 @param VendorGuid - GUID of the variable to compare to 'Variable'\r
306 @param PtrTrack - Variable Track Pointer structure that contains\r
307 Variable Information.\r
308\r
309 @retval EFI_SUCCESS - Found match variable\r
310 @retval EFI_NOT_FOUND - Variable not found\r
311\r
312**/\r
313EFI_STATUS\r
314CompareWithValidVariable (\r
315 IN VARIABLE_HEADER *Variable,\r
316 IN CONST CHAR16 *VariableName,\r
317 IN CONST EFI_GUID *VendorGuid,\r
318 OUT VARIABLE_POINTER_TRACK *PtrTrack\r
319 )\r
320\r
321{\r
322 VOID *Point;\r
323\r
324 if (VariableName[0] == 0) {\r
325 PtrTrack->CurrPtr = Variable;\r
326 return EFI_SUCCESS;\r
327 } else {\r
328 //\r
329 // Don't use CompareGuid function here for performance reasons.\r
330 // Instead we compare the GUID a UINT32 at a time and branch\r
331 // on the first failed comparison.\r
332 //\r
333 if ((((INT32 *) VendorGuid)[0] == ((INT32 *) &Variable->VendorGuid)[0]) &&\r
334 (((INT32 *) VendorGuid)[1] == ((INT32 *) &Variable->VendorGuid)[1]) &&\r
335 (((INT32 *) VendorGuid)[2] == ((INT32 *) &Variable->VendorGuid)[2]) &&\r
336 (((INT32 *) VendorGuid)[3] == ((INT32 *) &Variable->VendorGuid)[3])\r
337 ) {\r
338 ASSERT (NameSizeOfVariable (Variable) != 0);\r
339 Point = (VOID *) GetVariableNamePtr (Variable);\r
340 if (!CompareMem (VariableName, Point, NameSizeOfVariable (Variable))) {\r
341 PtrTrack->CurrPtr = Variable;\r
342 return EFI_SUCCESS;\r
343 }\r
344 }\r
345 }\r
346\r
347 return EFI_NOT_FOUND;\r
348}\r
349\r
350/**\r
351 This code finds variable in storage blocks (Non-Volatile)\r
352\r
353 @param PeiServices - General purpose services available to every PEIM.\r
354 @param VariableName - Name of the variable to be found\r
355 @param VendorGuid - Vendor GUID to be found.\r
356 @param PtrTrack - Variable Track Pointer structure that contains\r
357 Variable Information.\r
358\r
359 @retval EFI_SUCCESS - Variable found successfully\r
360 @retval EFI_NOT_FOUND - Variable not found\r
361 @retval EFI_INVALID_PARAMETER - Invalid variable name\r
362\r
363**/\r
364EFI_STATUS\r
365EFIAPI\r
366FindVariable (\r
367 IN EFI_PEI_SERVICES **PeiServices,\r
368 IN CONST CHAR16 *VariableName,\r
369 IN CONST EFI_GUID *VendorGuid,\r
370 OUT VARIABLE_POINTER_TRACK *PtrTrack\r
371 )\r
372\r
373{\r
374 EFI_HOB_GUID_TYPE *GuidHob;\r
375 VARIABLE_STORE_HEADER *VariableStoreHeader;\r
376 VARIABLE_HEADER *Variable;\r
377 VARIABLE_HEADER *MaxIndex;\r
378 VARIABLE_INDEX_TABLE *IndexTable;\r
379 UINT32 Count;\r
380 UINT8 *VariableBase;\r
381\r
382 if (VariableName != 0 && VendorGuid == NULL) {\r
383 return EFI_INVALID_PARAMETER;\r
384 }\r
385 //\r
386 // No Variable Address equals zero, so 0 as initial value is safe.\r
387 //\r
388 MaxIndex = 0;\r
389\r
390 GuidHob = GetFirstGuidHob (&mEfiVariableIndexTableGuid);\r
391 if (GuidHob == NULL) {\r
392 IndexTable = BuildGuidHob (&mEfiVariableIndexTableGuid, sizeof (VARIABLE_INDEX_TABLE));\r
393 IndexTable->Length = 0;\r
394 IndexTable->StartPtr = NULL;\r
395 IndexTable->EndPtr = NULL;\r
396 IndexTable->GoneThrough = 0;\r
397 } else {\r
398 IndexTable = GET_GUID_HOB_DATA (GuidHob);\r
399 for (Count = 0; Count < IndexTable->Length; Count++)\r
400 {\r
401 MaxIndex = GetVariableByIndex (IndexTable, Count);\r
402\r
403 if (CompareWithValidVariable (MaxIndex, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {\r
404 PtrTrack->StartPtr = IndexTable->StartPtr;\r
405 PtrTrack->EndPtr = IndexTable->EndPtr;\r
406\r
407 return EFI_SUCCESS;\r
408 }\r
409 }\r
410\r
411 if (IndexTable->GoneThrough) {\r
412 return EFI_NOT_FOUND;\r
413 }\r
414 }\r
415 //\r
416 // If not found in HOB, then let's start from the MaxIndex we've found.\r
417 //\r
418 if (MaxIndex != NULL) {\r
419 Variable = GetNextVariablePtr (MaxIndex);\r
420 } else {\r
421 if (IndexTable->StartPtr || IndexTable->EndPtr) {\r
422 Variable = IndexTable->StartPtr;\r
423 } else {\r
424 VariableBase = (UINT8 *) (UINTN) PcdGet32 (PcdFlashNvStorageVariableBase);\r
425 VariableStoreHeader = (VARIABLE_STORE_HEADER *) (VariableBase + \\r
426 ((EFI_FIRMWARE_VOLUME_HEADER *) (VariableBase)) -> HeaderLength);\r
427\r
428 if (GetVariableStoreStatus (VariableStoreHeader) != EfiValid) {\r
429 return EFI_UNSUPPORTED;\r
430 }\r
431\r
432 if (~VariableStoreHeader->Size == 0) {\r
433 return EFI_NOT_FOUND;\r
434 }\r
435 //\r
436 // Find the variable by walk through non-volatile variable store\r
437 //\r
438 IndexTable->StartPtr = GetStartPointer (VariableStoreHeader);\r
439 IndexTable->EndPtr = GetEndPointer (VariableStoreHeader);\r
440\r
441 //\r
442 // Start Pointers for the variable.\r
443 // Actual Data Pointer where data can be written.\r
444 //\r
445 Variable = IndexTable->StartPtr;\r
446 }\r
447 }\r
448 //\r
449 // Find the variable by walk through non-volatile variable store\r
450 //\r
451 PtrTrack->StartPtr = IndexTable->StartPtr;\r
452 PtrTrack->EndPtr = IndexTable->EndPtr;\r
453\r
454 while (IsValidVariableHeader (Variable) && (Variable <= IndexTable->EndPtr)) {\r
455 if (Variable->State == VAR_ADDED) {\r
456 //\r
457 // Record Variable in VariableIndex HOB\r
458 //\r
459 if (IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME)\r
460 {\r
461 VariableIndexTableUpdate (IndexTable, Variable);\r
462 }\r
463\r
464 if (CompareWithValidVariable (Variable, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {\r
465 return EFI_SUCCESS;\r
466 }\r
467 }\r
468\r
469 Variable = GetNextVariablePtr (Variable);\r
470 }\r
471 //\r
472 // If gone through the VariableStore, that means we never find in Firmware any more.\r
473 //\r
474 if (IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME) {\r
475 IndexTable->GoneThrough = 1;\r
476 }\r
477\r
478 PtrTrack->CurrPtr = NULL;\r
479\r
480 return EFI_NOT_FOUND;\r
481}\r
482\r
483/**\r
484 Provide the read variable functionality of the variable services.\r
485\r
486 @param PeiServices - General purpose services available to every PEIM.\r
487\r
488 @param VariableName - The variable name\r
489\r
490 @param VendorGuid - The vendor's GUID\r
491\r
492 @param Attributes - Pointer to the attribute\r
493\r
494 @param DataSize - Size of data\r
495\r
496 @param Data - Pointer to data\r
497\r
498 @retval EFI_SUCCESS - The interface could be successfully installed\r
499\r
500 @retval EFI_NOT_FOUND - The variable could not be discovered\r
501\r
502 @retval EFI_BUFFER_TOO_SMALL - The caller buffer is not large enough\r
503\r
504**/\r
505EFI_STATUS\r
506EFIAPI\r
507PeiGetVariable (\r
508 IN EFI_PEI_SERVICES **PeiServices,\r
509 IN CHAR16 *VariableName,\r
510 IN EFI_GUID * VendorGuid,\r
511 OUT UINT32 *Attributes OPTIONAL,\r
512 IN OUT UINTN *DataSize,\r
513 OUT VOID *Data\r
514 )\r
515\r
516{\r
517 VARIABLE_POINTER_TRACK Variable;\r
518 UINTN VarDataSize;\r
519 EFI_STATUS Status;\r
520\r
521 if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {\r
522 return EFI_INVALID_PARAMETER;\r
523 }\r
524 //\r
525 // Find existing variable\r
526 //\r
527 Status = FindVariable (PeiServices, VariableName, VendorGuid, &Variable);\r
528\r
529 if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {\r
530 return Status;\r
531 }\r
532 //\r
533 // Get data size\r
534 //\r
535 VarDataSize = DataSizeOfVariable (Variable.CurrPtr);\r
536 if (*DataSize >= VarDataSize) {\r
537 //\r
538 // PO-TKW: Address one checking in this place\r
539 //\r
540 if (Data == NULL) {\r
541 return EFI_INVALID_PARAMETER;\r
542 }\r
543\r
544 (*PeiServices)->CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr), VarDataSize);\r
545\r
546 if (Attributes != NULL) {\r
547 *Attributes = Variable.CurrPtr->Attributes;\r
548 }\r
549\r
550 *DataSize = VarDataSize;\r
551 return EFI_SUCCESS;\r
552 } else {\r
553 *DataSize = VarDataSize;\r
554 return EFI_BUFFER_TOO_SMALL;\r
555 }\r
556}\r
557\r
558/**\r
559 Provide the read variable functionality of the variable services.\r
560\r
561 @param PeiServices - General purpose services available to every PEIM.\r
562\r
563 @param VariableName - The variable name\r
564\r
565 @param VendorGuid - The vendor's GUID\r
566\r
567 @param Attributes - Pointer to the attribute\r
568\r
569 @param DataSize - Size of data\r
570\r
571 @param Data - Pointer to data\r
572\r
573 @retval EFI_SUCCESS - The interface could be successfully installed\r
574\r
575 @retval EFI_NOT_FOUND - The variable could not be discovered\r
576\r
577 @retval EFI_BUFFER_TOO_SMALL - The caller buffer is not large enough\r
578\r
579**/\r
580EFI_STATUS\r
581EFIAPI\r
582PeiGetVariable2 (\r
583 IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,\r
584 IN CONST CHAR16 *VariableName,\r
585 IN CONST EFI_GUID *VariableGuid,\r
586 OUT UINT32 *Attributes,\r
587 IN OUT UINTN *DataSize,\r
588 OUT VOID *Data\r
589 )\r
590\r
591{\r
592 return PeiGetVariable (\r
593 (EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),\r
594 (CHAR16*)VariableName,\r
595 (EFI_GUID*)VariableGuid,\r
596 Attributes,\r
597 DataSize,\r
598 Data\r
599 );\r
600}\r
601\r
602/**\r
603 Provide the get next variable functionality of the variable services.\r
604\r
605 @param PeiServices - General purpose services available to every PEIM.\r
606 @param VariabvleNameSize - The variable name's size.\r
607 @param VariableName - A pointer to the variable's name.\r
608 @param VendorGuid - A pointer to the EFI_GUID structure.\r
609\r
610 @param VariableNameSize - Size of the variable name\r
611\r
612 @param VariableName - The variable name\r
613\r
614 @param VendorGuid - The vendor's GUID\r
615\r
616 @retval EFI_SUCCESS - The interface could be successfully installed\r
617\r
618 @retval EFI_NOT_FOUND - The variable could not be discovered\r
619\r
620**/\r
621EFI_STATUS\r
622EFIAPI\r
623PeiGetNextVariableName (\r
624 IN EFI_PEI_SERVICES **PeiServices,\r
625 IN OUT UINTN *VariableNameSize,\r
626 IN OUT CHAR16 *VariableName,\r
627 IN OUT EFI_GUID *VendorGuid\r
628 )\r
629\r
630{\r
631 VARIABLE_POINTER_TRACK Variable;\r
632 UINTN VarNameSize;\r
633 EFI_STATUS Status;\r
634\r
635 if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {\r
636 return EFI_INVALID_PARAMETER;\r
637 }\r
638\r
639 Status = FindVariable (PeiServices, VariableName, VendorGuid, &Variable);\r
640\r
641 if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {\r
642 return Status;\r
643 }\r
644\r
645 if (VariableName[0] != 0) {\r
646 //\r
647 // If variable name is not NULL, get next variable\r
648 //\r
649 Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);\r
650 }\r
651\r
652 while (!(Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == NULL)) {\r
653 if (IsValidVariableHeader (Variable.CurrPtr)) {\r
654 if (Variable.CurrPtr->State == VAR_ADDED) {\r
655 ASSERT (NameSizeOfVariable (Variable.CurrPtr) != 0);\r
656\r
657 VarNameSize = (UINTN) NameSizeOfVariable (Variable.CurrPtr);\r
658 if (VarNameSize <= *VariableNameSize) {\r
659 (*PeiServices)->CopyMem (VariableName, GetVariableNamePtr (Variable.CurrPtr), VarNameSize);\r
660\r
661 (*PeiServices)->CopyMem (VendorGuid, &Variable.CurrPtr->VendorGuid, sizeof (EFI_GUID));\r
662\r
663 Status = EFI_SUCCESS;\r
664 } else {\r
665 Status = EFI_BUFFER_TOO_SMALL;\r
666 }\r
667\r
668 *VariableNameSize = VarNameSize;\r
669 return Status;\r
670 //\r
671 // Variable is found\r
672 //\r
673 } else {\r
674 Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);\r
675 }\r
676 } else {\r
677 break;\r
678 }\r
679 }\r
680\r
681 return EFI_NOT_FOUND;\r
682}\r
683\r
684/**\r
685 Provide the get next variable functionality of the variable services.\r
686\r
687 @param PeiServices - General purpose services available to every PEIM.\r
688 @param VariabvleNameSize - The variable name's size.\r
689 @param VariableName - A pointer to the variable's name.\r
690 @param VariableGuid - A pointer to the EFI_GUID structure.\r
691\r
692 @param VariableNameSize - Size of the variable name\r
693\r
694 @param VariableName - The variable name\r
695\r
696 @param VendorGuid - The vendor's GUID\r
697\r
698\r
699 @retval EFI_SUCCESS - The interface could be successfully installed\r
700\r
701 @retval EFI_NOT_FOUND - The variable could not be discovered\r
702\r
703**/\r
704EFI_STATUS\r
705EFIAPI\r
706PeiGetNextVariableName2 (\r
707 IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,\r
708 IN OUT UINTN *VariableNameSize,\r
709 IN OUT CHAR16 *VariableName,\r
710 IN OUT EFI_GUID *VariableGuid\r
711 )\r
712\r
713{\r
714 return PeiGetNextVariableName (\r
715 (EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),\r
716 VariableNameSize,\r
717 VariableName,\r
718 VariableGuid\r
719 );\r
720}\r
721\r
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