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504214c4 LG |
1 | /** @file\r |
2 | \r | |
3 | Implement ReadOnly Variable Services required by PEIM and install\r | |
02c57ded | 4 | PEI ReadOnly Varaiable2 PPI. These services operates the non volatile storage space.\r |
8d3a5c82 | 5 | \r |
01f352a7 | 6 | Copyright (c) 2006 - 2008 Intel Corporation. <BR>\r |
8d3a5c82 | 7 | All rights reserved. This program and the accompanying materials\r |
8 | are licensed and made available under the terms and conditions of the BSD License\r | |
9 | which accompanies this distribution. The full text of the license may be found at\r | |
10 | http://opensource.org/licenses/bsd-license.php\r | |
11 | \r | |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | Module Name:\r | |
15 | \r | |
504214c4 | 16 | **/\r |
8d3a5c82 | 17 | \r |
18 | \r | |
19 | #include "Variable.h"\r | |
20 | \r | |
21 | //\r | |
22 | // Module globals\r | |
23 | //\r | |
fe1e36e5 | 24 | EFI_PEI_READ_ONLY_VARIABLE2_PPI mVariablePpi = {\r |
8d3a5c82 | 25 | PeiGetVariable,\r |
26 | PeiGetNextVariableName\r | |
27 | };\r | |
28 | \r | |
fe1e36e5 | 29 | EFI_PEI_PPI_DESCRIPTOR mPpiListVariable = {\r |
8d3a5c82 | 30 | (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),\r |
31 | &gEfiPeiReadOnlyVariable2PpiGuid,\r | |
32 | &mVariablePpi\r | |
33 | };\r | |
34 | \r | |
35 | EFI_GUID mEfiVariableIndexTableGuid = EFI_VARIABLE_INDEX_TABLE_GUID;\r | |
36 | \r | |
8d3a5c82 | 37 | \r |
33479ddf | 38 | /**\r |
8d3a5c82 | 39 | Provide the functionality of the variable services.\r |
33479ddf | 40 | \r |
41 | @param FileHandle Handle of the file being invoked. \r | |
42 | Type EFI_PEI_FILE_HANDLE is defined in FfsFindNextFile().\r | |
43 | @param PeiServices General purpose services available to every PEIM.\r | |
8d3a5c82 | 44 | \r |
33479ddf | 45 | @retval EFI_SUCCESS If the interface could be successfully installed\r |
46 | @retval Others Returned from PeiServicesInstallPpi()\r | |
8d3a5c82 | 47 | \r |
33479ddf | 48 | **/\r |
49 | EFI_STATUS\r | |
50 | EFIAPI\r | |
51 | PeimInitializeVariableServices (\r | |
52 | IN EFI_PEI_FILE_HANDLE FileHandle,\r | |
53 | IN CONST EFI_PEI_SERVICES **PeiServices\r | |
54 | )\r | |
8d3a5c82 | 55 | {\r |
56 | //\r | |
57 | // Publish the variable capability to other modules\r | |
58 | //\r | |
33479ddf | 59 | return PeiServicesInstallPpi (&mPpiListVariable);\r |
8d3a5c82 | 60 | \r |
61 | }\r | |
62 | \r | |
9cad030b | 63 | \r |
33479ddf | 64 | /**\r |
65 | This code gets the pointer to the first variable memory pointer byte.\r | |
9cad030b | 66 | \r |
33479ddf | 67 | @param VarStoreHeader Pointer to the Variable Store Header.\r |
9cad030b | 68 | \r |
33479ddf | 69 | @return VARIABLE_HEADER* pointer to last unavailable Variable Header.\r |
9cad030b | 70 | \r |
33479ddf | 71 | **/\r |
72 | VARIABLE_HEADER *\r | |
73 | GetStartPointer (\r | |
74 | IN VARIABLE_STORE_HEADER *VarStoreHeader\r | |
75 | )\r | |
9cad030b | 76 | {\r |
77 | //\r | |
78 | // The end of variable store\r | |
79 | //\r | |
80 | return (VARIABLE_HEADER *) HEADER_ALIGN (VarStoreHeader + 1);\r | |
81 | }\r | |
82 | \r | |
9cad030b | 83 | \r |
33479ddf | 84 | /**\r |
85 | This code gets the pointer to the last variable memory pointer byte.\r | |
9cad030b | 86 | \r |
33479ddf | 87 | @param VarStoreHeader Pointer to the Variable Store Header.\r |
9cad030b | 88 | \r |
33479ddf | 89 | @return VARIABLE_HEADER* pointer to last unavailable Variable Header.\r |
9cad030b | 90 | \r |
33479ddf | 91 | **/\r |
92 | VARIABLE_HEADER *\r | |
93 | GetEndPointer (\r | |
94 | IN VARIABLE_STORE_HEADER *VarStoreHeader\r | |
95 | )\r | |
9cad030b | 96 | {\r |
97 | //\r | |
98 | // The end of variable store\r | |
99 | //\r | |
100 | return (VARIABLE_HEADER *) HEADER_ALIGN ((UINTN) VarStoreHeader + VarStoreHeader->Size);\r | |
101 | }\r | |
102 | \r | |
8d3a5c82 | 103 | \r |
33479ddf | 104 | /**\r |
8d3a5c82 | 105 | This code checks if variable header is valid or not.\r |
106 | \r | |
33479ddf | 107 | @param Variable Pointer to the Variable Header.\r |
8d3a5c82 | 108 | \r |
33479ddf | 109 | @retval TRUE Variable header is valid.\r |
110 | @retval FALSE Variable header is not valid.\r | |
8d3a5c82 | 111 | \r |
33479ddf | 112 | **/\r |
113 | BOOLEAN\r | |
114 | IsValidVariableHeader (\r | |
115 | IN VARIABLE_HEADER *Variable\r | |
116 | )\r | |
8d3a5c82 | 117 | {\r |
130e2569 | 118 | if (Variable == NULL || Variable->StartId != VARIABLE_DATA ) {\r |
119 | return FALSE;\r | |
120 | }\r | |
121 | \r | |
122 | return TRUE;\r | |
8d3a5c82 | 123 | }\r |
124 | \r | |
130e2569 | 125 | \r |
33479ddf | 126 | /**\r |
130e2569 | 127 | This code gets the size of name of variable.\r |
128 | \r | |
33479ddf | 129 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 130 | \r |
33479ddf | 131 | @return Size of variable in bytes in type UINTN.\r |
130e2569 | 132 | \r |
33479ddf | 133 | **/\r |
134 | UINTN\r | |
135 | NameSizeOfVariable (\r | |
136 | IN VARIABLE_HEADER *Variable\r | |
137 | )\r | |
130e2569 | 138 | {\r |
139 | if (Variable->State == (UINT8) (-1) ||\r | |
140 | Variable->DataSize == (UINT32) -1 ||\r | |
141 | Variable->NameSize == (UINT32) -1 ||\r | |
142 | Variable->Attributes == (UINT32) -1) {\r | |
143 | return 0;\r | |
144 | }\r | |
145 | return (UINTN) Variable->NameSize;\r | |
146 | }\r | |
147 | \r | |
130e2569 | 148 | \r |
33479ddf | 149 | /**\r |
150 | This code gets the size of data of variable.\r | |
130e2569 | 151 | \r |
33479ddf | 152 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 153 | \r |
33479ddf | 154 | @return Size of variable in bytes in type UINTN.\r |
130e2569 | 155 | \r |
33479ddf | 156 | **/\r |
157 | UINTN\r | |
158 | DataSizeOfVariable (\r | |
159 | IN VARIABLE_HEADER *Variable\r | |
160 | )\r | |
130e2569 | 161 | {\r |
162 | if (Variable->State == (UINT8) -1 ||\r | |
163 | Variable->DataSize == (UINT32) -1 ||\r | |
164 | Variable->NameSize == (UINT32) -1 ||\r | |
165 | Variable->Attributes == (UINT32) -1) {\r | |
166 | return 0;\r | |
167 | }\r | |
168 | return (UINTN) Variable->DataSize;\r | |
169 | }\r | |
170 | \r | |
33479ddf | 171 | /**\r |
130e2569 | 172 | This code gets the pointer to the variable name.\r |
8d3a5c82 | 173 | \r |
33479ddf | 174 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 175 | \r |
33479ddf | 176 | @return A CHAR16* pointer to Variable Name.\r |
130e2569 | 177 | \r |
33479ddf | 178 | **/\r |
179 | CHAR16 *\r | |
180 | GetVariableNamePtr (\r | |
181 | IN VARIABLE_HEADER *Variable\r | |
182 | )\r | |
130e2569 | 183 | {\r |
184 | \r | |
185 | return (CHAR16 *) (Variable + 1);\r | |
186 | }\r | |
187 | \r | |
188 | \r | |
33479ddf | 189 | /**\r |
130e2569 | 190 | This code gets the pointer to the variable data.\r |
191 | \r | |
33479ddf | 192 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 193 | \r |
33479ddf | 194 | @return A UINT8* pointer to Variable Data.\r |
130e2569 | 195 | \r |
33479ddf | 196 | **/\r |
197 | UINT8 *\r | |
198 | GetVariableDataPtr (\r | |
199 | IN VARIABLE_HEADER *Variable\r | |
200 | )\r | |
130e2569 | 201 | {\r |
202 | UINTN Value;\r | |
203 | \r | |
204 | //\r | |
205 | // Be careful about pad size for alignment\r | |
206 | //\r | |
207 | Value = (UINTN) GetVariableNamePtr (Variable);\r | |
208 | Value += NameSizeOfVariable (Variable);\r | |
209 | Value += GET_PAD_SIZE (NameSizeOfVariable (Variable));\r | |
210 | \r | |
211 | return (UINT8 *) Value;\r | |
212 | }\r | |
213 | \r | |
130e2569 | 214 | \r |
33479ddf | 215 | /**\r |
130e2569 | 216 | This code gets the pointer to the next variable header.\r |
217 | \r | |
33479ddf | 218 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 219 | \r |
33479ddf | 220 | @return A VARIABLE_HEADER* pointer to next variable header.\r |
8d3a5c82 | 221 | \r |
33479ddf | 222 | **/\r |
223 | VARIABLE_HEADER *\r | |
224 | GetNextVariablePtr (\r | |
225 | IN VARIABLE_HEADER *Variable\r | |
226 | )\r | |
8d3a5c82 | 227 | {\r |
130e2569 | 228 | UINTN Value;\r |
229 | \r | |
230 | if (!IsValidVariableHeader (Variable)) {\r | |
231 | return NULL;\r | |
8d3a5c82 | 232 | }\r |
233 | \r | |
130e2569 | 234 | Value = (UINTN) GetVariableDataPtr (Variable);\r |
235 | Value += DataSizeOfVariable (Variable);\r | |
236 | Value += GET_PAD_SIZE (DataSizeOfVariable (Variable));\r | |
237 | \r | |
238 | //\r | |
239 | // Be careful about pad size for alignment\r | |
240 | //\r | |
241 | return (VARIABLE_HEADER *) HEADER_ALIGN (Value);\r | |
8d3a5c82 | 242 | }\r |
243 | \r | |
33479ddf | 244 | /**\r |
245 | This code gets the pointer to the variable name.\r | |
246 | \r | |
247 | @param VarStoreHeader Pointer to the Variable Store Header.\r | |
248 | \r | |
249 | @retval EfiRaw Variable store is raw\r | |
250 | @retval EfiValid Variable store is valid\r | |
251 | @retval EfiInvalid Variable store is invalid\r | |
130e2569 | 252 | \r |
33479ddf | 253 | **/\r |
8d3a5c82 | 254 | VARIABLE_STORE_STATUS\r |
8d3a5c82 | 255 | GetVariableStoreStatus (\r |
256 | IN VARIABLE_STORE_HEADER *VarStoreHeader\r | |
257 | )\r | |
8d3a5c82 | 258 | {\r |
259 | if (VarStoreHeader->Signature == VARIABLE_STORE_SIGNATURE &&\r | |
260 | VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&\r | |
261 | VarStoreHeader->State == VARIABLE_STORE_HEALTHY\r | |
262 | ) {\r | |
263 | \r | |
264 | return EfiValid;\r | |
265 | }\r | |
266 | \r | |
267 | if (VarStoreHeader->Signature == 0xffffffff &&\r | |
268 | VarStoreHeader->Size == 0xffffffff &&\r | |
269 | VarStoreHeader->Format == 0xff &&\r | |
270 | VarStoreHeader->State == 0xff\r | |
271 | ) {\r | |
272 | \r | |
273 | return EfiRaw;\r | |
274 | } else {\r | |
275 | return EfiInvalid;\r | |
276 | }\r | |
277 | }\r | |
278 | \r | |
33479ddf | 279 | \r |
280 | /**\r | |
281 | This function compares a variable with variable entries in database.\r | |
282 | \r | |
283 | @param Variable Pointer to the variable in our database\r | |
284 | @param VariableName Name of the variable to compare to 'Variable'\r | |
285 | @param VendorGuid GUID of the variable to compare to 'Variable'\r | |
286 | @param PtrTrack Variable Track Pointer structure that contains Variable Information.\r | |
287 | \r | |
288 | @retval EFI_SUCCESS Found match variable\r | |
289 | @retval EFI_NOT_FOUND Variable not found\r | |
290 | \r | |
291 | **/\r | |
8d3a5c82 | 292 | EFI_STATUS\r |
293 | CompareWithValidVariable (\r | |
294 | IN VARIABLE_HEADER *Variable,\r | |
295 | IN CONST CHAR16 *VariableName,\r | |
296 | IN CONST EFI_GUID *VendorGuid,\r | |
297 | OUT VARIABLE_POINTER_TRACK *PtrTrack\r | |
298 | )\r | |
8d3a5c82 | 299 | {\r |
130e2569 | 300 | VOID *Point;\r |
301 | \r | |
8d3a5c82 | 302 | if (VariableName[0] == 0) {\r |
303 | PtrTrack->CurrPtr = Variable;\r | |
304 | return EFI_SUCCESS;\r | |
305 | } else {\r | |
306 | //\r | |
307 | // Don't use CompareGuid function here for performance reasons.\r | |
308 | // Instead we compare the GUID a UINT32 at a time and branch\r | |
309 | // on the first failed comparison.\r | |
310 | //\r | |
311 | if ((((INT32 *) VendorGuid)[0] == ((INT32 *) &Variable->VendorGuid)[0]) &&\r | |
312 | (((INT32 *) VendorGuid)[1] == ((INT32 *) &Variable->VendorGuid)[1]) &&\r | |
313 | (((INT32 *) VendorGuid)[2] == ((INT32 *) &Variable->VendorGuid)[2]) &&\r | |
314 | (((INT32 *) VendorGuid)[3] == ((INT32 *) &Variable->VendorGuid)[3])\r | |
315 | ) {\r | |
130e2569 | 316 | ASSERT (NameSizeOfVariable (Variable) != 0);\r |
317 | Point = (VOID *) GetVariableNamePtr (Variable);\r | |
dfc005c3 | 318 | if (CompareMem (VariableName, Point, NameSizeOfVariable (Variable)) == 0) {\r |
8d3a5c82 | 319 | PtrTrack->CurrPtr = Variable;\r |
320 | return EFI_SUCCESS;\r | |
321 | }\r | |
322 | }\r | |
323 | }\r | |
324 | \r | |
325 | return EFI_NOT_FOUND;\r | |
326 | }\r | |
327 | \r | |
33479ddf | 328 | \r |
329 | /**\r | |
330 | This code finds variable in storage blocks (Non-Volatile).\r | |
331 | \r | |
332 | @param PeiServices General purpose services available to every PEIM.\r | |
333 | @param VariableName Name of the variable to be found\r | |
334 | @param VendorGuid Vendor GUID to be found.\r | |
335 | @param PtrTrack Variable Track Pointer structure that contains Variable Information.\r | |
336 | \r | |
337 | @retval EFI_SUCCESS Variable found successfully\r | |
338 | @retval EFI_NOT_FOUND Variable not found\r | |
339 | @retval EFI_INVALID_PARAMETER Invalid variable name\r | |
340 | \r | |
341 | **/\r | |
8d3a5c82 | 342 | EFI_STATUS\r |
8d3a5c82 | 343 | FindVariable (\r |
284c8400 | 344 | IN CONST EFI_PEI_SERVICES **PeiServices,\r |
8d3a5c82 | 345 | IN CONST CHAR16 *VariableName,\r |
346 | IN CONST EFI_GUID *VendorGuid,\r | |
347 | OUT VARIABLE_POINTER_TRACK *PtrTrack\r | |
348 | )\r | |
8d3a5c82 | 349 | {\r |
350 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
351 | VARIABLE_STORE_HEADER *VariableStoreHeader;\r | |
352 | VARIABLE_HEADER *Variable;\r | |
353 | VARIABLE_HEADER *MaxIndex;\r | |
354 | VARIABLE_INDEX_TABLE *IndexTable;\r | |
355 | UINT32 Count;\r | |
356 | UINT8 *VariableBase;\r | |
357 | \r | |
358 | if (VariableName != 0 && VendorGuid == NULL) {\r | |
359 | return EFI_INVALID_PARAMETER;\r | |
360 | }\r | |
361 | //\r | |
362 | // No Variable Address equals zero, so 0 as initial value is safe.\r | |
363 | //\r | |
364 | MaxIndex = 0;\r | |
365 | \r | |
366 | GuidHob = GetFirstGuidHob (&mEfiVariableIndexTableGuid);\r | |
367 | if (GuidHob == NULL) {\r | |
368 | IndexTable = BuildGuidHob (&mEfiVariableIndexTableGuid, sizeof (VARIABLE_INDEX_TABLE));\r | |
369 | IndexTable->Length = 0;\r | |
370 | IndexTable->StartPtr = NULL;\r | |
371 | IndexTable->EndPtr = NULL;\r | |
372 | IndexTable->GoneThrough = 0;\r | |
373 | } else {\r | |
374 | IndexTable = GET_GUID_HOB_DATA (GuidHob);\r | |
33479ddf | 375 | for (Count = 0; Count < IndexTable->Length; Count++) {\r |
8d3a5c82 | 376 | MaxIndex = GetVariableByIndex (IndexTable, Count);\r |
377 | \r | |
378 | if (CompareWithValidVariable (MaxIndex, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {\r | |
379 | PtrTrack->StartPtr = IndexTable->StartPtr;\r | |
380 | PtrTrack->EndPtr = IndexTable->EndPtr;\r | |
381 | \r | |
382 | return EFI_SUCCESS;\r | |
383 | }\r | |
384 | }\r | |
385 | \r | |
33479ddf | 386 | if (IndexTable->GoneThrough != 0) {\r |
8d3a5c82 | 387 | return EFI_NOT_FOUND;\r |
388 | }\r | |
389 | }\r | |
390 | //\r | |
391 | // If not found in HOB, then let's start from the MaxIndex we've found.\r | |
392 | //\r | |
393 | if (MaxIndex != NULL) {\r | |
394 | Variable = GetNextVariablePtr (MaxIndex);\r | |
395 | } else {\r | |
33479ddf | 396 | if ((IndexTable->StartPtr != NULL) || (IndexTable->EndPtr != NULL)) {\r |
8d3a5c82 | 397 | Variable = IndexTable->StartPtr;\r |
398 | } else {\r | |
399 | VariableBase = (UINT8 *) (UINTN) PcdGet32 (PcdFlashNvStorageVariableBase);\r | |
400 | VariableStoreHeader = (VARIABLE_STORE_HEADER *) (VariableBase + \\r | |
401 | ((EFI_FIRMWARE_VOLUME_HEADER *) (VariableBase)) -> HeaderLength);\r | |
402 | \r | |
403 | if (GetVariableStoreStatus (VariableStoreHeader) != EfiValid) {\r | |
404 | return EFI_UNSUPPORTED;\r | |
405 | }\r | |
406 | \r | |
407 | if (~VariableStoreHeader->Size == 0) {\r | |
408 | return EFI_NOT_FOUND;\r | |
409 | }\r | |
410 | //\r | |
411 | // Find the variable by walk through non-volatile variable store\r | |
412 | //\r | |
9cad030b | 413 | IndexTable->StartPtr = GetStartPointer (VariableStoreHeader);\r |
414 | IndexTable->EndPtr = GetEndPointer (VariableStoreHeader);\r | |
8d3a5c82 | 415 | \r |
416 | //\r | |
417 | // Start Pointers for the variable.\r | |
418 | // Actual Data Pointer where data can be written.\r | |
419 | //\r | |
420 | Variable = IndexTable->StartPtr;\r | |
421 | }\r | |
422 | }\r | |
423 | //\r | |
424 | // Find the variable by walk through non-volatile variable store\r | |
425 | //\r | |
426 | PtrTrack->StartPtr = IndexTable->StartPtr;\r | |
427 | PtrTrack->EndPtr = IndexTable->EndPtr;\r | |
428 | \r | |
429 | while (IsValidVariableHeader (Variable) && (Variable <= IndexTable->EndPtr)) {\r | |
430 | if (Variable->State == VAR_ADDED) {\r | |
431 | //\r | |
432 | // Record Variable in VariableIndex HOB\r | |
433 | //\r | |
33479ddf | 434 | if (IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME) {\r |
8d3a5c82 | 435 | VariableIndexTableUpdate (IndexTable, Variable);\r |
436 | }\r | |
437 | \r | |
438 | if (CompareWithValidVariable (Variable, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {\r | |
439 | return EFI_SUCCESS;\r | |
440 | }\r | |
441 | }\r | |
442 | \r | |
443 | Variable = GetNextVariablePtr (Variable);\r | |
444 | }\r | |
445 | //\r | |
446 | // If gone through the VariableStore, that means we never find in Firmware any more.\r | |
447 | //\r | |
448 | if (IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME) {\r | |
449 | IndexTable->GoneThrough = 1;\r | |
450 | }\r | |
451 | \r | |
452 | PtrTrack->CurrPtr = NULL;\r | |
453 | \r | |
454 | return EFI_NOT_FOUND;\r | |
455 | }\r | |
456 | \r | |
33479ddf | 457 | /**\r |
458 | This service retrieves a variable's value using its name and GUID.\r | |
459 | \r | |
460 | Read the specified variable from the UEFI variable store. If the Data \r | |
461 | buffer is too small to hold the contents of the variable, the error\r | |
462 | EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer\r | |
463 | size to obtain the data.\r | |
464 | \r | |
465 | @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.\r | |
466 | @param VariableName A pointer to a null-terminated string that is the variable's name.\r | |
467 | @param VariableGuid A pointer to an EFI_GUID that is the variable's GUID. The combination of\r | |
468 | VariableGuid and VariableName must be unique.\r | |
469 | @param Attributes If non-NULL, on return, points to the variable's attributes.\r | |
470 | @param DataSize On entry, points to the size in bytes of the Data buffer.\r | |
471 | On return, points to the size of the data returned in Data.\r | |
472 | @param Data Points to the buffer which will hold the returned variable value.\r | |
473 | \r | |
474 | @retval EFI_SUCCESS The variable was read successfully.\r | |
475 | @retval EFI_NOT_FOUND The variable could not be found.\r | |
476 | @retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the resulting data. \r | |
477 | DataSize is updated with the size required for \r | |
478 | the specified variable.\r | |
479 | @retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.\r | |
480 | @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.\r | |
481 | \r | |
482 | **/\r | |
8d3a5c82 | 483 | EFI_STATUS\r |
484 | EFIAPI\r | |
485 | PeiGetVariable (\r | |
486 | IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,\r | |
487 | IN CONST CHAR16 *VariableName,\r | |
488 | IN CONST EFI_GUID *VariableGuid,\r | |
489 | OUT UINT32 *Attributes,\r | |
490 | IN OUT UINTN *DataSize,\r | |
491 | OUT VOID *Data\r | |
492 | )\r | |
8d3a5c82 | 493 | {\r |
494 | VARIABLE_POINTER_TRACK Variable;\r | |
495 | UINTN VarDataSize;\r | |
496 | EFI_STATUS Status;\r | |
284c8400 | 497 | CONST EFI_PEI_SERVICES **PeiServices;\r |
8d3a5c82 | 498 | \r |
499 | PeiServices = GetPeiServicesTablePointer ();\r | |
01f352a7 | 500 | if (VariableName == NULL || VariableGuid == NULL || DataSize == NULL) {\r |
8d3a5c82 | 501 | return EFI_INVALID_PARAMETER;\r |
502 | }\r | |
503 | //\r | |
504 | // Find existing variable\r | |
505 | //\r | |
506 | Status = FindVariable (PeiServices, VariableName, VariableGuid, &Variable);\r | |
507 | if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {\r | |
508 | return Status;\r | |
509 | }\r | |
510 | //\r | |
511 | // Get data size\r | |
512 | //\r | |
130e2569 | 513 | VarDataSize = DataSizeOfVariable (Variable.CurrPtr);\r |
8d3a5c82 | 514 | if (*DataSize >= VarDataSize) {\r |
39aea48d | 515 | if (Data == NULL) {\r |
516 | return EFI_INVALID_PARAMETER;\r | |
517 | }\r | |
518 | \r | |
33479ddf | 519 | CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr), VarDataSize);\r |
8d3a5c82 | 520 | \r |
521 | if (Attributes != NULL) {\r | |
522 | *Attributes = Variable.CurrPtr->Attributes;\r | |
523 | }\r | |
524 | \r | |
525 | *DataSize = VarDataSize;\r | |
526 | return EFI_SUCCESS;\r | |
527 | } else {\r | |
528 | *DataSize = VarDataSize;\r | |
529 | return EFI_BUFFER_TOO_SMALL;\r | |
530 | }\r | |
531 | }\r | |
532 | \r | |
33479ddf | 533 | /**\r |
534 | Return the next variable name and GUID.\r | |
535 | \r | |
536 | This function is called multiple times to retrieve the VariableName \r | |
537 | and VariableGuid of all variables currently available in the system. \r | |
538 | On each call, the previous results are passed into the interface, \r | |
539 | and, on return, the interface returns the data for the next \r | |
540 | interface. When the entire variable list has been returned, \r | |
541 | EFI_NOT_FOUND is returned.\r | |
542 | \r | |
543 | @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.\r | |
544 | \r | |
545 | @param VariableNameSize On entry, points to the size of the buffer pointed to by VariableName.\r | |
546 | @param VariableName On entry, a pointer to a null-terminated string that is the variable's name.\r | |
547 | On return, points to the next variable's null-terminated name string.\r | |
548 | @param VariableGuid On entry, a pointer to an UEFI _GUID that is the variable's GUID. \r | |
549 | On return, a pointer to the next variable's GUID.\r | |
550 | \r | |
551 | @retval EFI_SUCCESS The variable was read successfully.\r | |
552 | @retval EFI_NOT_FOUND The variable could not be found.\r | |
553 | @retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the resulting\r | |
554 | data. VariableNameSize is updated with the size\r | |
555 | required for the specified variable.\r | |
556 | @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or\r | |
557 | VariableNameSize is NULL.\r | |
558 | @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.\r | |
559 | \r | |
560 | **/\r | |
8d3a5c82 | 561 | EFI_STATUS\r |
562 | EFIAPI\r | |
563 | PeiGetNextVariableName (\r | |
564 | IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,\r | |
565 | IN OUT UINTN *VariableNameSize,\r | |
566 | IN OUT CHAR16 *VariableName,\r | |
567 | IN OUT EFI_GUID *VariableGuid\r | |
568 | )\r | |
8d3a5c82 | 569 | {\r |
570 | VARIABLE_POINTER_TRACK Variable;\r | |
571 | UINTN VarNameSize;\r | |
572 | EFI_STATUS Status;\r | |
284c8400 | 573 | CONST EFI_PEI_SERVICES **PeiServices;\r |
8d3a5c82 | 574 | \r |
575 | PeiServices = GetPeiServicesTablePointer ();\r | |
01f352a7 | 576 | if (VariableName == NULL || VariableGuid == NULL || VariableNameSize == NULL) {\r |
8d3a5c82 | 577 | return EFI_INVALID_PARAMETER;\r |
578 | }\r | |
579 | \r | |
580 | Status = FindVariable (PeiServices, VariableName, VariableGuid, &Variable);\r | |
581 | if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {\r | |
582 | return Status;\r | |
583 | }\r | |
584 | \r | |
585 | if (VariableName[0] != 0) {\r | |
586 | //\r | |
587 | // If variable name is not NULL, get next variable\r | |
588 | //\r | |
589 | Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);\r | |
590 | }\r | |
591 | \r | |
592 | while (!(Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == NULL)) {\r | |
593 | if (IsValidVariableHeader (Variable.CurrPtr)) {\r | |
594 | if (Variable.CurrPtr->State == VAR_ADDED) {\r | |
130e2569 | 595 | ASSERT (NameSizeOfVariable (Variable.CurrPtr) != 0);\r |
9cad030b | 596 | \r |
130e2569 | 597 | VarNameSize = (UINTN) NameSizeOfVariable (Variable.CurrPtr);\r |
8d3a5c82 | 598 | if (VarNameSize <= *VariableNameSize) {\r |
33479ddf | 599 | CopyMem (VariableName, GetVariableNamePtr (Variable.CurrPtr), VarNameSize);\r |
8d3a5c82 | 600 | \r |
33479ddf | 601 | CopyMem (VariableGuid, &Variable.CurrPtr->VendorGuid, sizeof (EFI_GUID));\r |
8d3a5c82 | 602 | \r |
603 | Status = EFI_SUCCESS;\r | |
604 | } else {\r | |
605 | Status = EFI_BUFFER_TOO_SMALL;\r | |
606 | }\r | |
607 | \r | |
608 | *VariableNameSize = VarNameSize;\r | |
609 | return Status;\r | |
610 | //\r | |
611 | // Variable is found\r | |
612 | //\r | |
613 | } else {\r | |
614 | Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);\r | |
615 | }\r | |
616 | } else {\r | |
617 | break;\r | |
618 | }\r | |
619 | }\r | |
620 | \r | |
621 | return EFI_NOT_FOUND;\r | |
622 | }\r |