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878ddf1f | 1 | /*++\r |
2 | \r | |
3 | Copyright (c) 2006, Intel Corporation \r | |
4 | All rights reserved. This program and the accompanying materials \r | |
5 | are licensed and made available under the terms and conditions of the BSD License \r | |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | Variable.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | Framework PEIM to provide the Variable functionality\r | |
19 | \r | |
20 | --*/\r | |
21 | \r | |
878ddf1f | 22 | #include <Variable.h>\r |
878ddf1f | 23 | \r |
24 | //\r | |
25 | // Module globals\r | |
26 | //\r | |
27 | static EFI_PEI_READ_ONLY_VARIABLE_PPI mVariablePpi = {\r | |
28 | PeiGetVariable,\r | |
29 | PeiGetNextVariableName\r | |
30 | };\r | |
31 | \r | |
32 | static EFI_PEI_PPI_DESCRIPTOR mPpiListVariable = {\r | |
33 | (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),\r | |
34 | &gEfiPeiReadOnlyVariablePpiGuid,\r | |
35 | &mVariablePpi\r | |
36 | };\r | |
37 | \r | |
38 | EFI_GUID gEfiVariableIndexTableGuid = EFI_VARIABLE_INDEX_TABLE_GUID;\r | |
39 | \r | |
40 | EFI_STATUS\r | |
41 | EFIAPI\r | |
42 | PeimInitializeVariableServices (\r | |
43 | IN EFI_FFS_FILE_HEADER *FfsHeader,\r | |
44 | IN EFI_PEI_SERVICES **PeiServices\r | |
45 | )\r | |
46 | /*++\r | |
47 | \r | |
48 | Routine Description:\r | |
49 | \r | |
50 | Provide the functionality of the variable services.\r | |
51 | \r | |
52 | Arguments:\r | |
53 | \r | |
54 | FfsHeadher - The FFS file header\r | |
55 | PeiServices - General purpose services available to every PEIM.\r | |
56 | \r | |
57 | Returns:\r | |
58 | \r | |
59 | Status - EFI_SUCCESS if the interface could be successfully\r | |
60 | installed\r | |
61 | \r | |
62 | --*/\r | |
63 | {\r | |
64 | //\r | |
65 | // Publish the variable capability to other modules\r | |
66 | //\r | |
67 | return (**PeiServices).InstallPpi (PeiServices, &mPpiListVariable);\r | |
68 | \r | |
69 | }\r | |
70 | \r | |
71 | VARIABLE_HEADER *\r | |
72 | GetNextVariablePtr (\r | |
73 | IN VARIABLE_HEADER *Variable\r | |
74 | )\r | |
75 | /*++\r | |
76 | \r | |
77 | Routine Description:\r | |
78 | \r | |
79 | This code checks if variable header is valid or not.\r | |
80 | \r | |
81 | Arguments:\r | |
82 | Variable Pointer to the Variable Header.\r | |
83 | \r | |
84 | Returns:\r | |
85 | TRUE Variable header is valid.\r | |
86 | FALSE Variable header is not valid.\r | |
87 | \r | |
88 | --*/\r | |
89 | {\r | |
90 | return (VARIABLE_HEADER *) ((UINTN) GET_VARIABLE_DATA_PTR (Variable) + Variable->DataSize + GET_PAD_SIZE (Variable->DataSize));\r | |
91 | }\r | |
92 | \r | |
93 | BOOLEAN\r | |
94 | EFIAPI\r | |
95 | IsValidVariableHeader (\r | |
96 | IN VARIABLE_HEADER *Variable\r | |
97 | )\r | |
98 | /*++\r | |
99 | \r | |
100 | Routine Description:\r | |
101 | \r | |
102 | This code checks if variable header is valid or not.\r | |
103 | \r | |
104 | Arguments:\r | |
105 | Variable Pointer to the Variable Header.\r | |
106 | \r | |
107 | Returns:\r | |
108 | TRUE Variable header is valid.\r | |
109 | FALSE Variable header is not valid.\r | |
110 | \r | |
111 | --*/\r | |
112 | {\r | |
113 | if (Variable == NULL ||\r | |
114 | Variable->StartId != VARIABLE_DATA ||\r | |
115 | (sizeof (VARIABLE_HEADER) + Variable->DataSize + Variable->NameSize) > MAX_VARIABLE_SIZE\r | |
116 | ) {\r | |
117 | return FALSE;\r | |
118 | }\r | |
119 | \r | |
120 | return TRUE;\r | |
121 | }\r | |
122 | \r | |
123 | VARIABLE_STORE_STATUS\r | |
124 | EFIAPI\r | |
125 | GetVariableStoreStatus (\r | |
126 | IN VARIABLE_STORE_HEADER *VarStoreHeader\r | |
127 | )\r | |
128 | /*++\r | |
129 | \r | |
130 | Routine Description:\r | |
131 | \r | |
132 | This code gets the pointer to the variable name.\r | |
133 | \r | |
134 | Arguments:\r | |
135 | \r | |
136 | VarStoreHeader Pointer to the Variable Store Header.\r | |
137 | \r | |
138 | Returns:\r | |
139 | \r | |
140 | EfiRaw Variable store is raw\r | |
141 | EfiValid Variable store is valid\r | |
142 | EfiInvalid Variable store is invalid\r | |
143 | \r | |
144 | --*/\r | |
145 | {\r | |
146 | if (VarStoreHeader->Signature == VARIABLE_STORE_SIGNATURE &&\r | |
147 | VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&\r | |
148 | VarStoreHeader->State == VARIABLE_STORE_HEALTHY\r | |
149 | ) {\r | |
150 | \r | |
151 | return EfiValid;\r | |
152 | }\r | |
153 | \r | |
154 | if (VarStoreHeader->Signature == 0xffffffff &&\r | |
155 | VarStoreHeader->Size == 0xffffffff &&\r | |
156 | VarStoreHeader->Format == 0xff &&\r | |
157 | VarStoreHeader->State == 0xff\r | |
158 | ) {\r | |
159 | \r | |
160 | return EfiRaw;\r | |
161 | } else {\r | |
162 | return EfiInvalid;\r | |
163 | }\r | |
164 | }\r | |
165 | \r | |
166 | EFI_STATUS\r | |
167 | CompareWithValidVariable (\r | |
168 | IN VARIABLE_HEADER *Variable,\r | |
169 | IN CHAR16 *VariableName,\r | |
170 | IN EFI_GUID *VendorGuid,\r | |
171 | OUT VARIABLE_POINTER_TRACK *PtrTrack\r | |
172 | )\r | |
173 | /*++\r | |
174 | \r | |
175 | Routine Description:\r | |
176 | \r | |
177 | This function compares a variable with variable entries in database\r | |
178 | \r | |
179 | Arguments:\r | |
180 | \r | |
181 | Variable - Pointer to the variable in our database\r | |
182 | VariableName - Name of the variable to compare to 'Variable'\r | |
183 | VendorGuid - GUID of the variable to compare to 'Variable'\r | |
184 | PtrTrack - Variable Track Pointer structure that contains\r | |
185 | Variable Information.\r | |
186 | \r | |
187 | Returns:\r | |
188 | \r | |
189 | EFI_SUCCESS - Found match variable\r | |
190 | EFI_NOT_FOUND - Variable not found\r | |
191 | \r | |
192 | --*/\r | |
193 | {\r | |
194 | if (VariableName[0] == 0) {\r | |
195 | PtrTrack->CurrPtr = Variable;\r | |
196 | return EFI_SUCCESS;\r | |
197 | } else {\r | |
198 | //\r | |
199 | // Don't use CompareGuid function here for performance reasons.\r | |
200 | // Instead we compare the GUID a UINT32 at a time and branch\r | |
201 | // on the first failed comparison.\r | |
202 | //\r | |
203 | if ((((INT32 *) VendorGuid)[0] == ((INT32 *) &Variable->VendorGuid)[0]) &&\r | |
204 | (((INT32 *) VendorGuid)[1] == ((INT32 *) &Variable->VendorGuid)[1]) &&\r | |
205 | (((INT32 *) VendorGuid)[2] == ((INT32 *) &Variable->VendorGuid)[2]) &&\r | |
206 | (((INT32 *) VendorGuid)[3] == ((INT32 *) &Variable->VendorGuid)[3])\r | |
207 | ) {\r | |
208 | if (!StrCmp (VariableName, GET_VARIABLE_NAME_PTR (Variable))) {\r | |
209 | PtrTrack->CurrPtr = Variable;\r | |
210 | return EFI_SUCCESS;\r | |
211 | }\r | |
212 | }\r | |
213 | }\r | |
214 | \r | |
215 | return EFI_NOT_FOUND;\r | |
216 | }\r | |
217 | \r | |
218 | EFI_STATUS\r | |
219 | EFIAPI\r | |
220 | FindVariable (\r | |
221 | IN EFI_PEI_SERVICES **PeiServices,\r | |
222 | IN CHAR16 *VariableName,\r | |
223 | IN EFI_GUID *VendorGuid,\r | |
224 | OUT VARIABLE_POINTER_TRACK *PtrTrack\r | |
225 | )\r | |
226 | /*++\r | |
227 | \r | |
228 | Routine Description:\r | |
229 | \r | |
230 | This code finds variable in storage blocks (Non-Volatile)\r | |
231 | \r | |
232 | Arguments:\r | |
233 | \r | |
234 | PeiServices - General purpose services available to every PEIM.\r | |
235 | VariableName - Name of the variable to be found\r | |
236 | VendorGuid - Vendor GUID to be found.\r | |
237 | PtrTrack - Variable Track Pointer structure that contains\r | |
238 | Variable Information.\r | |
239 | \r | |
240 | Returns:\r | |
241 | \r | |
242 | EFI_SUCCESS - Variable found successfully\r | |
243 | EFI_NOT_FOUND - Variable not found\r | |
244 | EFI_INVALID_PARAMETER - Invalid variable name\r | |
245 | \r | |
246 | --*/\r | |
247 | {\r | |
878ddf1f | 248 | EFI_HOB_GUID_TYPE *GuidHob;\r |
249 | VARIABLE_STORE_HEADER *VariableStoreHeader;\r | |
250 | VARIABLE_HEADER *Variable;\r | |
878ddf1f | 251 | VARIABLE_HEADER *MaxIndex;\r |
252 | VARIABLE_INDEX_TABLE *IndexTable;\r | |
253 | UINT32 Count;\r | |
5dd2d779 | 254 | UINT8 *VariableBase;\r |
878ddf1f | 255 | \r |
256 | if (VariableName != 0 && VendorGuid == NULL) {\r | |
257 | return EFI_INVALID_PARAMETER;\r | |
258 | }\r | |
259 | //\r | |
260 | // No Variable Address equals zero, so 0 as initial value is safe.\r | |
261 | //\r | |
262 | MaxIndex = 0;\r | |
263 | \r | |
264 | GuidHob = GetFirstGuidHob (&gEfiVariableIndexTableGuid);\r | |
265 | if (GuidHob == NULL) {\r | |
266 | IndexTable = BuildGuidHob (&gEfiVariableIndexTableGuid, sizeof (VARIABLE_INDEX_TABLE));\r | |
267 | IndexTable->Length = 0;\r | |
268 | IndexTable->StartPtr = NULL;\r | |
269 | IndexTable->EndPtr = NULL;\r | |
270 | IndexTable->GoneThrough = 0;\r | |
271 | } else {\r | |
272 | IndexTable = GET_GUID_HOB_DATA (GuidHob);\r | |
273 | for (Count = 0; Count < IndexTable->Length; Count++)\r | |
274 | {\r | |
275 | #if ALIGNMENT <= 1\r | |
276 | MaxIndex = (VARIABLE_HEADER *) (UINTN) (IndexTable->Index[Count] + ((UINTN) IndexTable->StartPtr & 0xFFFF0000));\r | |
277 | #else\r | |
278 | #if ALIGNMENT >= 4\r | |
279 | MaxIndex = (VARIABLE_HEADER *) (UINTN) ((((UINT32)IndexTable->Index[Count]) << 2) + ((UINT32)(UINTN)IndexTable->StartPtr & 0xFFFC0000) ); \r | |
280 | #endif\r | |
281 | #endif\r | |
282 | if (CompareWithValidVariable (MaxIndex, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {\r | |
283 | PtrTrack->StartPtr = IndexTable->StartPtr;\r | |
284 | PtrTrack->EndPtr = IndexTable->EndPtr;\r | |
285 | \r | |
286 | return EFI_SUCCESS;\r | |
287 | }\r | |
288 | }\r | |
289 | \r | |
290 | if (IndexTable->GoneThrough) {\r | |
291 | return EFI_NOT_FOUND;\r | |
292 | }\r | |
293 | }\r | |
294 | //\r | |
295 | // If not found in HOB, then let's start from the MaxIndex we've found.\r | |
296 | //\r | |
297 | if (MaxIndex != NULL) {\r | |
298 | Variable = GetNextVariablePtr (MaxIndex);\r | |
299 | } else {\r | |
300 | if (IndexTable->StartPtr || IndexTable->EndPtr) {\r | |
301 | Variable = IndexTable->StartPtr;\r | |
302 | } else {\r | |
5dd2d779 | 303 | VariableBase = (UINT8 *) (UINTN) PcdGet32 (PcdFlashNvStorageVariableBase);\r |
304 | VariableStoreHeader = (VARIABLE_STORE_HEADER *) (VariableBase + \\r | |
305 | ((EFI_FIRMWARE_VOLUME_HEADER *) (VariableBase)) -> HeaderLength);\r | |
306 | \r | |
878ddf1f | 307 | if (GetVariableStoreStatus (VariableStoreHeader) != EfiValid) {\r |
308 | return EFI_UNSUPPORTED;\r | |
309 | }\r | |
310 | \r | |
311 | if (~VariableStoreHeader->Size == 0) {\r | |
312 | return EFI_NOT_FOUND;\r | |
313 | }\r | |
314 | //\r | |
315 | // Find the variable by walk through non-volatile variable store\r | |
316 | //\r | |
317 | IndexTable->StartPtr = (VARIABLE_HEADER *) (VariableStoreHeader + 1);\r | |
318 | IndexTable->EndPtr = (VARIABLE_HEADER *) ((UINTN) VariableStoreHeader + VariableStoreHeader->Size);\r | |
319 | \r | |
320 | //\r | |
321 | // Start Pointers for the variable.\r | |
322 | // Actual Data Pointer where data can be written.\r | |
323 | //\r | |
324 | Variable = IndexTable->StartPtr;\r | |
325 | }\r | |
326 | }\r | |
327 | //\r | |
328 | // Find the variable by walk through non-volatile variable store\r | |
329 | //\r | |
330 | PtrTrack->StartPtr = IndexTable->StartPtr;\r | |
331 | PtrTrack->EndPtr = IndexTable->EndPtr;\r | |
332 | \r | |
333 | while (IsValidVariableHeader (Variable) && (Variable <= IndexTable->EndPtr)) {\r | |
334 | if (Variable->State == VAR_ADDED) {\r | |
335 | //\r | |
336 | // Record Variable in VariableIndex HOB\r | |
337 | //\r | |
338 | if (IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME)\r | |
339 | {\r | |
340 | #if ALIGNMENT <= 1\r | |
341 | IndexTable->Index[IndexTable->Length++] = (UINT16) (UINTN) Variable;\r | |
342 | #else\r | |
343 | #if ALIGNMENT >= 4\r | |
344 | IndexTable->Index[IndexTable->Length++] = (UINT16) (((UINT32)(UINTN) Variable) >> 2);\r | |
345 | #endif\r | |
346 | #endif\r | |
347 | }\r | |
348 | \r | |
349 | if (CompareWithValidVariable (Variable, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {\r | |
350 | return EFI_SUCCESS;\r | |
351 | }\r | |
352 | }\r | |
353 | \r | |
354 | Variable = GetNextVariablePtr (Variable);\r | |
355 | }\r | |
356 | //\r | |
357 | // If gone through the VariableStore, that means we never find in Firmware any more.\r | |
358 | //\r | |
359 | if (IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME) {\r | |
360 | IndexTable->GoneThrough = 1;\r | |
361 | }\r | |
362 | \r | |
363 | PtrTrack->CurrPtr = NULL;\r | |
364 | \r | |
365 | return EFI_NOT_FOUND;\r | |
366 | }\r | |
367 | \r | |
368 | EFI_STATUS\r | |
369 | EFIAPI\r | |
370 | PeiGetVariable (\r | |
371 | IN EFI_PEI_SERVICES **PeiServices,\r | |
372 | IN CHAR16 *VariableName,\r | |
373 | IN EFI_GUID * VendorGuid,\r | |
374 | OUT UINT32 *Attributes OPTIONAL,\r | |
375 | IN OUT UINTN *DataSize,\r | |
376 | OUT VOID *Data\r | |
377 | )\r | |
378 | /*++\r | |
379 | \r | |
380 | Routine Description:\r | |
381 | \r | |
382 | Provide the read variable functionality of the variable services.\r | |
383 | \r | |
384 | Arguments:\r | |
385 | \r | |
386 | PeiServices - General purpose services available to every PEIM.\r | |
387 | \r | |
388 | VariableName - The variable name\r | |
389 | \r | |
390 | VendorGuid - The vendor's GUID\r | |
391 | \r | |
392 | Attributes - Pointer to the attribute\r | |
393 | \r | |
394 | DataSize - Size of data\r | |
395 | \r | |
396 | Data - Pointer to data\r | |
397 | \r | |
398 | Returns:\r | |
399 | \r | |
400 | EFI_SUCCESS - The interface could be successfully installed\r | |
401 | \r | |
402 | EFI_NOT_FOUND - The variable could not be discovered\r | |
403 | \r | |
404 | EFI_BUFFER_TOO_SMALL - The caller buffer is not large enough\r | |
405 | \r | |
406 | --*/\r | |
407 | {\r | |
408 | VARIABLE_POINTER_TRACK Variable;\r | |
409 | UINTN VarDataSize;\r | |
410 | EFI_STATUS Status;\r | |
411 | \r | |
412 | if (VariableName == NULL || VendorGuid == NULL) {\r | |
413 | return EFI_INVALID_PARAMETER;\r | |
414 | }\r | |
415 | //\r | |
416 | // Find existing variable\r | |
417 | //\r | |
418 | Status = FindVariable (PeiServices, VariableName, VendorGuid, &Variable);\r | |
419 | \r | |
420 | if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {\r | |
421 | return Status;\r | |
422 | }\r | |
423 | //\r | |
424 | // Get data size\r | |
425 | //\r | |
426 | VarDataSize = Variable.CurrPtr->DataSize;\r | |
427 | if (*DataSize >= VarDataSize) {\r | |
428 | (*PeiServices)->CopyMem (Data, GET_VARIABLE_DATA_PTR (Variable.CurrPtr), VarDataSize);\r | |
429 | \r | |
430 | if (Attributes != NULL) {\r | |
431 | *Attributes = Variable.CurrPtr->Attributes;\r | |
432 | }\r | |
433 | \r | |
434 | *DataSize = VarDataSize;\r | |
435 | return EFI_SUCCESS;\r | |
436 | } else {\r | |
437 | *DataSize = VarDataSize;\r | |
438 | return EFI_BUFFER_TOO_SMALL;\r | |
439 | }\r | |
440 | }\r | |
441 | \r | |
442 | EFI_STATUS\r | |
443 | EFIAPI\r | |
444 | PeiGetNextVariableName (\r | |
445 | IN EFI_PEI_SERVICES **PeiServices,\r | |
446 | IN OUT UINTN *VariableNameSize,\r | |
447 | IN OUT CHAR16 *VariableName,\r | |
448 | IN OUT EFI_GUID *VendorGuid\r | |
449 | )\r | |
450 | /*++\r | |
451 | \r | |
452 | Routine Description:\r | |
453 | \r | |
454 | Provide the get next variable functionality of the variable services.\r | |
455 | \r | |
456 | Arguments:\r | |
457 | \r | |
458 | PeiServices - General purpose services available to every PEIM.\r | |
459 | VariabvleNameSize - The variable name's size.\r | |
460 | VariableName - A pointer to the variable's name.\r | |
461 | VendorGuid - A pointer to the EFI_GUID structure.\r | |
462 | \r | |
463 | VariableNameSize - Size of the variable name\r | |
464 | \r | |
465 | VariableName - The variable name\r | |
466 | \r | |
467 | VendorGuid - The vendor's GUID\r | |
468 | \r | |
469 | Returns:\r | |
470 | \r | |
471 | EFI_SUCCESS - The interface could be successfully installed\r | |
472 | \r | |
473 | EFI_NOT_FOUND - The variable could not be discovered\r | |
474 | \r | |
475 | --*/\r | |
476 | {\r | |
477 | VARIABLE_POINTER_TRACK Variable;\r | |
478 | UINTN VarNameSize;\r | |
479 | EFI_STATUS Status;\r | |
480 | \r | |
481 | if (VariableName == NULL) {\r | |
482 | return EFI_INVALID_PARAMETER;\r | |
483 | }\r | |
484 | \r | |
485 | Status = FindVariable (PeiServices, VariableName, VendorGuid, &Variable);\r | |
486 | \r | |
487 | if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {\r | |
488 | return Status;\r | |
489 | }\r | |
490 | \r | |
491 | if (VariableName[0] != 0) {\r | |
492 | //\r | |
493 | // If variable name is not NULL, get next variable\r | |
494 | //\r | |
495 | Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);\r | |
496 | }\r | |
497 | \r | |
498 | while (!(Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == NULL)) {\r | |
499 | if (IsValidVariableHeader (Variable.CurrPtr)) {\r | |
500 | if (Variable.CurrPtr->State == VAR_ADDED) {\r | |
501 | VarNameSize = (UINTN) Variable.CurrPtr->NameSize;\r | |
502 | if (VarNameSize <= *VariableNameSize) {\r | |
503 | (*PeiServices)->CopyMem (VariableName, GET_VARIABLE_NAME_PTR (Variable.CurrPtr), VarNameSize);\r | |
504 | \r | |
505 | (*PeiServices)->CopyMem (VendorGuid, &Variable.CurrPtr->VendorGuid, sizeof (EFI_GUID));\r | |
506 | \r | |
507 | Status = EFI_SUCCESS;\r | |
508 | } else {\r | |
509 | Status = EFI_BUFFER_TOO_SMALL;\r | |
510 | }\r | |
511 | \r | |
512 | *VariableNameSize = VarNameSize;\r | |
513 | return Status;\r | |
514 | //\r | |
515 | // Variable is found\r | |
516 | //\r | |
517 | } else {\r | |
518 | Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);\r | |
519 | }\r | |
520 | } else {\r | |
521 | break;\r | |
522 | }\r | |
523 | }\r | |
524 | \r | |
525 | return EFI_NOT_FOUND;\r | |
526 | }\r |