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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 |
721dfef3 | 41 | @param FileHandle Handle of the file being invoked. \r |
42 | Type EFI_PEI_FILE_HANDLE is defined in FfsFindNextFile().\r | |
33479ddf | 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 |
721dfef3 | 56 | EFI_BOOT_MODE BootMode;\r |
57 | EFI_STATUS Status;\r | |
58 | \r | |
8d3a5c82 | 59 | //\r |
721dfef3 | 60 | // Check if this is recovery boot path. If no, publish the variable access capability\r |
61 | // to other modules. If yes, the content of variable area is not reliable. Therefore,\r | |
62 | // in this case we should not provide variable service to other pei modules. \r | |
63 | // \r | |
64 | Status = (*PeiServices)->GetBootMode (PeiServices, &BootMode);\r | |
65 | ASSERT_EFI_ERROR (Status);\r | |
66 | \r | |
67 | if (BootMode == BOOT_IN_RECOVERY_MODE) {\r | |
68 | return EFI_UNSUPPORTED;\r | |
69 | }\r | |
70 | \r | |
33479ddf | 71 | return PeiServicesInstallPpi (&mPpiListVariable);\r |
8d3a5c82 | 72 | \r |
73 | }\r | |
74 | \r | |
33479ddf | 75 | /**\r |
9cad030b | 76 | \r |
7c80e839 | 77 | Gets the pointer to the first variable header in given variable store area.\r |
9cad030b | 78 | \r |
7c80e839 | 79 | @param VarStoreHeader Pointer to the Variable Store Header.\r |
80 | \r | |
81 | @return Pointer to the first variable header\r | |
9cad030b | 82 | \r |
33479ddf | 83 | **/\r |
84 | VARIABLE_HEADER *\r | |
85 | GetStartPointer (\r | |
86 | IN VARIABLE_STORE_HEADER *VarStoreHeader\r | |
87 | )\r | |
9cad030b | 88 | {\r |
89 | //\r | |
90 | // The end of variable store\r | |
91 | //\r | |
92 | return (VARIABLE_HEADER *) HEADER_ALIGN (VarStoreHeader + 1);\r | |
93 | }\r | |
94 | \r | |
9cad030b | 95 | \r |
33479ddf | 96 | /**\r |
97 | This code gets the pointer to the last variable memory pointer byte.\r | |
9cad030b | 98 | \r |
33479ddf | 99 | @param VarStoreHeader Pointer to the Variable Store Header.\r |
9cad030b | 100 | \r |
33479ddf | 101 | @return VARIABLE_HEADER* pointer to last unavailable Variable Header.\r |
9cad030b | 102 | \r |
33479ddf | 103 | **/\r |
104 | VARIABLE_HEADER *\r | |
105 | GetEndPointer (\r | |
106 | IN VARIABLE_STORE_HEADER *VarStoreHeader\r | |
107 | )\r | |
9cad030b | 108 | {\r |
109 | //\r | |
110 | // The end of variable store\r | |
111 | //\r | |
112 | return (VARIABLE_HEADER *) HEADER_ALIGN ((UINTN) VarStoreHeader + VarStoreHeader->Size);\r | |
113 | }\r | |
114 | \r | |
8d3a5c82 | 115 | \r |
33479ddf | 116 | /**\r |
8d3a5c82 | 117 | This code checks if variable header is valid or not.\r |
118 | \r | |
33479ddf | 119 | @param Variable Pointer to the Variable Header.\r |
8d3a5c82 | 120 | \r |
33479ddf | 121 | @retval TRUE Variable header is valid.\r |
122 | @retval FALSE Variable header is not valid.\r | |
8d3a5c82 | 123 | \r |
33479ddf | 124 | **/\r |
125 | BOOLEAN\r | |
126 | IsValidVariableHeader (\r | |
127 | IN VARIABLE_HEADER *Variable\r | |
128 | )\r | |
8d3a5c82 | 129 | {\r |
130e2569 | 130 | if (Variable == NULL || Variable->StartId != VARIABLE_DATA ) {\r |
131 | return FALSE;\r | |
132 | }\r | |
133 | \r | |
134 | return TRUE;\r | |
8d3a5c82 | 135 | }\r |
136 | \r | |
130e2569 | 137 | \r |
33479ddf | 138 | /**\r |
130e2569 | 139 | This code gets the size of name of variable.\r |
140 | \r | |
33479ddf | 141 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 142 | \r |
33479ddf | 143 | @return Size of variable in bytes in type UINTN.\r |
130e2569 | 144 | \r |
33479ddf | 145 | **/\r |
146 | UINTN\r | |
147 | NameSizeOfVariable (\r | |
148 | IN VARIABLE_HEADER *Variable\r | |
149 | )\r | |
130e2569 | 150 | {\r |
151 | if (Variable->State == (UINT8) (-1) ||\r | |
7c80e839 | 152 | Variable->DataSize == (UINT32) (-1) ||\r |
153 | Variable->NameSize == (UINT32) (-1) ||\r | |
154 | Variable->Attributes == (UINT32) (-1)) {\r | |
130e2569 | 155 | return 0;\r |
156 | }\r | |
157 | return (UINTN) Variable->NameSize;\r | |
158 | }\r | |
159 | \r | |
130e2569 | 160 | \r |
33479ddf | 161 | /**\r |
162 | This code gets the size of data of variable.\r | |
130e2569 | 163 | \r |
33479ddf | 164 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 165 | \r |
33479ddf | 166 | @return Size of variable in bytes in type UINTN.\r |
130e2569 | 167 | \r |
33479ddf | 168 | **/\r |
169 | UINTN\r | |
170 | DataSizeOfVariable (\r | |
171 | IN VARIABLE_HEADER *Variable\r | |
172 | )\r | |
130e2569 | 173 | {\r |
7c80e839 | 174 | if (Variable->State == (UINT8) (-1) ||\r |
175 | Variable->DataSize == (UINT32) (-1) ||\r | |
176 | Variable->NameSize == (UINT32) (-1) ||\r | |
177 | Variable->Attributes == (UINT32) (-1)) {\r | |
130e2569 | 178 | return 0;\r |
179 | }\r | |
180 | return (UINTN) Variable->DataSize;\r | |
181 | }\r | |
182 | \r | |
33479ddf | 183 | /**\r |
130e2569 | 184 | This code gets the pointer to the variable name.\r |
8d3a5c82 | 185 | \r |
33479ddf | 186 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 187 | \r |
33479ddf | 188 | @return A CHAR16* pointer to Variable Name.\r |
130e2569 | 189 | \r |
33479ddf | 190 | **/\r |
191 | CHAR16 *\r | |
192 | GetVariableNamePtr (\r | |
193 | IN VARIABLE_HEADER *Variable\r | |
194 | )\r | |
130e2569 | 195 | {\r |
196 | \r | |
197 | return (CHAR16 *) (Variable + 1);\r | |
198 | }\r | |
199 | \r | |
200 | \r | |
33479ddf | 201 | /**\r |
130e2569 | 202 | This code gets the pointer to the variable data.\r |
203 | \r | |
33479ddf | 204 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 205 | \r |
33479ddf | 206 | @return A UINT8* pointer to Variable Data.\r |
130e2569 | 207 | \r |
33479ddf | 208 | **/\r |
209 | UINT8 *\r | |
210 | GetVariableDataPtr (\r | |
211 | IN VARIABLE_HEADER *Variable\r | |
212 | )\r | |
130e2569 | 213 | {\r |
214 | UINTN Value;\r | |
215 | \r | |
216 | //\r | |
217 | // Be careful about pad size for alignment\r | |
218 | //\r | |
219 | Value = (UINTN) GetVariableNamePtr (Variable);\r | |
220 | Value += NameSizeOfVariable (Variable);\r | |
221 | Value += GET_PAD_SIZE (NameSizeOfVariable (Variable));\r | |
222 | \r | |
223 | return (UINT8 *) Value;\r | |
224 | }\r | |
225 | \r | |
130e2569 | 226 | \r |
33479ddf | 227 | /**\r |
130e2569 | 228 | This code gets the pointer to the next variable header.\r |
229 | \r | |
33479ddf | 230 | @param Variable Pointer to the Variable Header.\r |
130e2569 | 231 | \r |
33479ddf | 232 | @return A VARIABLE_HEADER* pointer to next variable header.\r |
8d3a5c82 | 233 | \r |
33479ddf | 234 | **/\r |
235 | VARIABLE_HEADER *\r | |
236 | GetNextVariablePtr (\r | |
237 | IN VARIABLE_HEADER *Variable\r | |
238 | )\r | |
8d3a5c82 | 239 | {\r |
130e2569 | 240 | UINTN Value;\r |
241 | \r | |
242 | if (!IsValidVariableHeader (Variable)) {\r | |
243 | return NULL;\r | |
8d3a5c82 | 244 | }\r |
245 | \r | |
130e2569 | 246 | Value = (UINTN) GetVariableDataPtr (Variable);\r |
247 | Value += DataSizeOfVariable (Variable);\r | |
248 | Value += GET_PAD_SIZE (DataSizeOfVariable (Variable));\r | |
249 | \r | |
250 | //\r | |
251 | // Be careful about pad size for alignment\r | |
252 | //\r | |
253 | return (VARIABLE_HEADER *) HEADER_ALIGN (Value);\r | |
8d3a5c82 | 254 | }\r |
255 | \r | |
33479ddf | 256 | /**\r |
257 | This code gets the pointer to the variable name.\r | |
258 | \r | |
259 | @param VarStoreHeader Pointer to the Variable Store Header.\r | |
260 | \r | |
261 | @retval EfiRaw Variable store is raw\r | |
262 | @retval EfiValid Variable store is valid\r | |
263 | @retval EfiInvalid Variable store is invalid\r | |
130e2569 | 264 | \r |
33479ddf | 265 | **/\r |
8d3a5c82 | 266 | VARIABLE_STORE_STATUS\r |
8d3a5c82 | 267 | GetVariableStoreStatus (\r |
268 | IN VARIABLE_STORE_HEADER *VarStoreHeader\r | |
269 | )\r | |
8d3a5c82 | 270 | {\r |
3709c4cd | 271 | \r |
272 | if (CompareGuid (&VarStoreHeader->Signature, &gEfiVariableGuid) &&\r | |
8d3a5c82 | 273 | VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&\r |
274 | VarStoreHeader->State == VARIABLE_STORE_HEALTHY\r | |
275 | ) {\r | |
276 | \r | |
277 | return EfiValid;\r | |
278 | }\r | |
279 | \r | |
3709c4cd | 280 | if (((UINT32 *)(&VarStoreHeader->Signature))[0] == 0xffffffff &&\r |
281 | ((UINT32 *)(&VarStoreHeader->Signature))[1] == 0xffffffff &&\r | |
282 | ((UINT32 *)(&VarStoreHeader->Signature))[2] == 0xffffffff &&\r | |
283 | ((UINT32 *)(&VarStoreHeader->Signature))[3] == 0xffffffff &&\r | |
8d3a5c82 | 284 | VarStoreHeader->Size == 0xffffffff &&\r |
285 | VarStoreHeader->Format == 0xff &&\r | |
286 | VarStoreHeader->State == 0xff\r | |
287 | ) {\r | |
288 | \r | |
289 | return EfiRaw;\r | |
290 | } else {\r | |
291 | return EfiInvalid;\r | |
292 | }\r | |
293 | }\r | |
294 | \r | |
33479ddf | 295 | \r |
296 | /**\r | |
297 | This function compares a variable with variable entries in database.\r | |
298 | \r | |
299 | @param Variable Pointer to the variable in our database\r | |
300 | @param VariableName Name of the variable to compare to 'Variable'\r | |
301 | @param VendorGuid GUID of the variable to compare to 'Variable'\r | |
302 | @param PtrTrack Variable Track Pointer structure that contains Variable Information.\r | |
303 | \r | |
304 | @retval EFI_SUCCESS Found match variable\r | |
305 | @retval EFI_NOT_FOUND Variable not found\r | |
306 | \r | |
307 | **/\r | |
8d3a5c82 | 308 | EFI_STATUS\r |
309 | CompareWithValidVariable (\r | |
310 | IN VARIABLE_HEADER *Variable,\r | |
311 | IN CONST CHAR16 *VariableName,\r | |
312 | IN CONST EFI_GUID *VendorGuid,\r | |
313 | OUT VARIABLE_POINTER_TRACK *PtrTrack\r | |
314 | )\r | |
8d3a5c82 | 315 | {\r |
130e2569 | 316 | VOID *Point;\r |
317 | \r | |
8d3a5c82 | 318 | if (VariableName[0] == 0) {\r |
319 | PtrTrack->CurrPtr = Variable;\r | |
320 | return EFI_SUCCESS;\r | |
321 | } else {\r | |
322 | //\r | |
323 | // Don't use CompareGuid function here for performance reasons.\r | |
324 | // Instead we compare the GUID a UINT32 at a time and branch\r | |
325 | // on the first failed comparison.\r | |
326 | //\r | |
327 | if ((((INT32 *) VendorGuid)[0] == ((INT32 *) &Variable->VendorGuid)[0]) &&\r | |
328 | (((INT32 *) VendorGuid)[1] == ((INT32 *) &Variable->VendorGuid)[1]) &&\r | |
329 | (((INT32 *) VendorGuid)[2] == ((INT32 *) &Variable->VendorGuid)[2]) &&\r | |
330 | (((INT32 *) VendorGuid)[3] == ((INT32 *) &Variable->VendorGuid)[3])\r | |
331 | ) {\r | |
130e2569 | 332 | ASSERT (NameSizeOfVariable (Variable) != 0);\r |
333 | Point = (VOID *) GetVariableNamePtr (Variable);\r | |
dfc005c3 | 334 | if (CompareMem (VariableName, Point, NameSizeOfVariable (Variable)) == 0) {\r |
8d3a5c82 | 335 | PtrTrack->CurrPtr = Variable;\r |
336 | return EFI_SUCCESS;\r | |
337 | }\r | |
338 | }\r | |
339 | }\r | |
340 | \r | |
341 | return EFI_NOT_FOUND;\r | |
342 | }\r | |
343 | \r | |
33479ddf | 344 | \r |
345 | /**\r | |
346 | This code finds variable in storage blocks (Non-Volatile).\r | |
347 | \r | |
348 | @param PeiServices General purpose services available to every PEIM.\r | |
349 | @param VariableName Name of the variable to be found\r | |
350 | @param VendorGuid Vendor GUID to be found.\r | |
351 | @param PtrTrack Variable Track Pointer structure that contains Variable Information.\r | |
352 | \r | |
353 | @retval EFI_SUCCESS Variable found successfully\r | |
354 | @retval EFI_NOT_FOUND Variable not found\r | |
355 | @retval EFI_INVALID_PARAMETER Invalid variable name\r | |
356 | \r | |
357 | **/\r | |
8d3a5c82 | 358 | EFI_STATUS\r |
8d3a5c82 | 359 | FindVariable (\r |
284c8400 | 360 | IN CONST EFI_PEI_SERVICES **PeiServices,\r |
8d3a5c82 | 361 | IN CONST CHAR16 *VariableName,\r |
362 | IN CONST EFI_GUID *VendorGuid,\r | |
363 | OUT VARIABLE_POINTER_TRACK *PtrTrack\r | |
364 | )\r | |
8d3a5c82 | 365 | {\r |
366 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
367 | VARIABLE_STORE_HEADER *VariableStoreHeader;\r | |
368 | VARIABLE_HEADER *Variable;\r | |
369 | VARIABLE_HEADER *MaxIndex;\r | |
370 | VARIABLE_INDEX_TABLE *IndexTable;\r | |
371 | UINT32 Count;\r | |
372 | UINT8 *VariableBase;\r | |
373 | \r | |
6041576e | 374 | if (VariableName[0] != 0 && VendorGuid == NULL) {\r |
8d3a5c82 | 375 | return EFI_INVALID_PARAMETER;\r |
376 | }\r | |
377 | //\r | |
378 | // No Variable Address equals zero, so 0 as initial value is safe.\r | |
379 | //\r | |
380 | MaxIndex = 0;\r | |
381 | \r | |
382 | GuidHob = GetFirstGuidHob (&mEfiVariableIndexTableGuid);\r | |
383 | if (GuidHob == NULL) {\r | |
384 | IndexTable = BuildGuidHob (&mEfiVariableIndexTableGuid, sizeof (VARIABLE_INDEX_TABLE));\r | |
385 | IndexTable->Length = 0;\r | |
386 | IndexTable->StartPtr = NULL;\r | |
387 | IndexTable->EndPtr = NULL;\r | |
388 | IndexTable->GoneThrough = 0;\r | |
389 | } else {\r | |
390 | IndexTable = GET_GUID_HOB_DATA (GuidHob);\r | |
33479ddf | 391 | for (Count = 0; Count < IndexTable->Length; Count++) {\r |
8d3a5c82 | 392 | MaxIndex = GetVariableByIndex (IndexTable, Count);\r |
393 | \r | |
394 | if (CompareWithValidVariable (MaxIndex, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {\r | |
395 | PtrTrack->StartPtr = IndexTable->StartPtr;\r | |
396 | PtrTrack->EndPtr = IndexTable->EndPtr;\r | |
397 | \r | |
398 | return EFI_SUCCESS;\r | |
399 | }\r | |
400 | }\r | |
401 | \r | |
33479ddf | 402 | if (IndexTable->GoneThrough != 0) {\r |
8d3a5c82 | 403 | return EFI_NOT_FOUND;\r |
404 | }\r | |
405 | }\r | |
406 | //\r | |
407 | // If not found in HOB, then let's start from the MaxIndex we've found.\r | |
408 | //\r | |
409 | if (MaxIndex != NULL) {\r | |
410 | Variable = GetNextVariablePtr (MaxIndex);\r | |
411 | } else {\r | |
33479ddf | 412 | if ((IndexTable->StartPtr != NULL) || (IndexTable->EndPtr != NULL)) {\r |
8d3a5c82 | 413 | Variable = IndexTable->StartPtr;\r |
414 | } else {\r | |
415 | VariableBase = (UINT8 *) (UINTN) PcdGet32 (PcdFlashNvStorageVariableBase);\r | |
416 | VariableStoreHeader = (VARIABLE_STORE_HEADER *) (VariableBase + \\r | |
417 | ((EFI_FIRMWARE_VOLUME_HEADER *) (VariableBase)) -> HeaderLength);\r | |
418 | \r | |
419 | if (GetVariableStoreStatus (VariableStoreHeader) != EfiValid) {\r | |
420 | return EFI_UNSUPPORTED;\r | |
421 | }\r | |
422 | \r | |
423 | if (~VariableStoreHeader->Size == 0) {\r | |
424 | return EFI_NOT_FOUND;\r | |
425 | }\r | |
426 | //\r | |
427 | // Find the variable by walk through non-volatile variable store\r | |
428 | //\r | |
9cad030b | 429 | IndexTable->StartPtr = GetStartPointer (VariableStoreHeader);\r |
430 | IndexTable->EndPtr = GetEndPointer (VariableStoreHeader);\r | |
8d3a5c82 | 431 | \r |
432 | //\r | |
433 | // Start Pointers for the variable.\r | |
434 | // Actual Data Pointer where data can be written.\r | |
435 | //\r | |
436 | Variable = IndexTable->StartPtr;\r | |
437 | }\r | |
438 | }\r | |
439 | //\r | |
440 | // Find the variable by walk through non-volatile variable store\r | |
441 | //\r | |
442 | PtrTrack->StartPtr = IndexTable->StartPtr;\r | |
443 | PtrTrack->EndPtr = IndexTable->EndPtr;\r | |
444 | \r | |
fba0ee1f | 445 | while ((Variable < IndexTable->EndPtr) && IsValidVariableHeader (Variable)) {\r |
8d3a5c82 | 446 | if (Variable->State == VAR_ADDED) {\r |
447 | //\r | |
448 | // Record Variable in VariableIndex HOB\r | |
449 | //\r | |
96a5ac5b | 450 | VariableIndexTableUpdate (IndexTable, Variable);\r |
451 | \r | |
8d3a5c82 | 452 | if (CompareWithValidVariable (Variable, VariableName, VendorGuid, PtrTrack) == EFI_SUCCESS) {\r |
453 | return EFI_SUCCESS;\r | |
454 | }\r | |
455 | }\r | |
456 | \r | |
457 | Variable = GetNextVariablePtr (Variable);\r | |
458 | }\r | |
459 | //\r | |
460 | // If gone through the VariableStore, that means we never find in Firmware any more.\r | |
461 | //\r | |
462 | if (IndexTable->Length < VARIABLE_INDEX_TABLE_VOLUME) {\r | |
463 | IndexTable->GoneThrough = 1;\r | |
464 | }\r | |
465 | \r | |
466 | PtrTrack->CurrPtr = NULL;\r | |
467 | \r | |
468 | return EFI_NOT_FOUND;\r | |
469 | }\r | |
470 | \r | |
33479ddf | 471 | /**\r |
472 | This service retrieves a variable's value using its name and GUID.\r | |
473 | \r | |
474 | Read the specified variable from the UEFI variable store. If the Data \r | |
475 | buffer is too small to hold the contents of the variable, the error\r | |
476 | EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer\r | |
477 | size to obtain the data.\r | |
478 | \r | |
479 | @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.\r | |
480 | @param VariableName A pointer to a null-terminated string that is the variable's name.\r | |
481 | @param VariableGuid A pointer to an EFI_GUID that is the variable's GUID. The combination of\r | |
482 | VariableGuid and VariableName must be unique.\r | |
483 | @param Attributes If non-NULL, on return, points to the variable's attributes.\r | |
484 | @param DataSize On entry, points to the size in bytes of the Data buffer.\r | |
485 | On return, points to the size of the data returned in Data.\r | |
486 | @param Data Points to the buffer which will hold the returned variable value.\r | |
487 | \r | |
488 | @retval EFI_SUCCESS The variable was read successfully.\r | |
489 | @retval EFI_NOT_FOUND The variable could not be found.\r | |
490 | @retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the resulting data. \r | |
491 | DataSize is updated with the size required for \r | |
492 | the specified variable.\r | |
493 | @retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.\r | |
494 | @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.\r | |
495 | \r | |
496 | **/\r | |
8d3a5c82 | 497 | EFI_STATUS\r |
498 | EFIAPI\r | |
499 | PeiGetVariable (\r | |
500 | IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,\r | |
501 | IN CONST CHAR16 *VariableName,\r | |
502 | IN CONST EFI_GUID *VariableGuid,\r | |
503 | OUT UINT32 *Attributes,\r | |
504 | IN OUT UINTN *DataSize,\r | |
505 | OUT VOID *Data\r | |
506 | )\r | |
8d3a5c82 | 507 | {\r |
508 | VARIABLE_POINTER_TRACK Variable;\r | |
509 | UINTN VarDataSize;\r | |
510 | EFI_STATUS Status;\r | |
284c8400 | 511 | CONST EFI_PEI_SERVICES **PeiServices;\r |
8d3a5c82 | 512 | \r |
513 | PeiServices = GetPeiServicesTablePointer ();\r | |
01f352a7 | 514 | if (VariableName == NULL || VariableGuid == NULL || DataSize == NULL) {\r |
8d3a5c82 | 515 | return EFI_INVALID_PARAMETER;\r |
516 | }\r | |
517 | //\r | |
518 | // Find existing variable\r | |
519 | //\r | |
520 | Status = FindVariable (PeiServices, VariableName, VariableGuid, &Variable);\r | |
521 | if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {\r | |
522 | return Status;\r | |
523 | }\r | |
524 | //\r | |
525 | // Get data size\r | |
526 | //\r | |
130e2569 | 527 | VarDataSize = DataSizeOfVariable (Variable.CurrPtr);\r |
8d3a5c82 | 528 | if (*DataSize >= VarDataSize) {\r |
39aea48d | 529 | if (Data == NULL) {\r |
530 | return EFI_INVALID_PARAMETER;\r | |
531 | }\r | |
532 | \r | |
33479ddf | 533 | CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr), VarDataSize);\r |
8d3a5c82 | 534 | \r |
535 | if (Attributes != NULL) {\r | |
536 | *Attributes = Variable.CurrPtr->Attributes;\r | |
537 | }\r | |
538 | \r | |
539 | *DataSize = VarDataSize;\r | |
540 | return EFI_SUCCESS;\r | |
541 | } else {\r | |
542 | *DataSize = VarDataSize;\r | |
543 | return EFI_BUFFER_TOO_SMALL;\r | |
544 | }\r | |
545 | }\r | |
546 | \r | |
33479ddf | 547 | /**\r |
548 | Return the next variable name and GUID.\r | |
549 | \r | |
550 | This function is called multiple times to retrieve the VariableName \r | |
551 | and VariableGuid of all variables currently available in the system. \r | |
552 | On each call, the previous results are passed into the interface, \r | |
553 | and, on return, the interface returns the data for the next \r | |
554 | interface. When the entire variable list has been returned, \r | |
555 | EFI_NOT_FOUND is returned.\r | |
556 | \r | |
557 | @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.\r | |
558 | \r | |
559 | @param VariableNameSize On entry, points to the size of the buffer pointed to by VariableName.\r | |
560 | @param VariableName On entry, a pointer to a null-terminated string that is the variable's name.\r | |
561 | On return, points to the next variable's null-terminated name string.\r | |
562 | @param VariableGuid On entry, a pointer to an UEFI _GUID that is the variable's GUID. \r | |
563 | On return, a pointer to the next variable's GUID.\r | |
564 | \r | |
565 | @retval EFI_SUCCESS The variable was read successfully.\r | |
566 | @retval EFI_NOT_FOUND The variable could not be found.\r | |
567 | @retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the resulting\r | |
568 | data. VariableNameSize is updated with the size\r | |
569 | required for the specified variable.\r | |
570 | @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or\r | |
571 | VariableNameSize is NULL.\r | |
572 | @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.\r | |
573 | \r | |
574 | **/\r | |
8d3a5c82 | 575 | EFI_STATUS\r |
576 | EFIAPI\r | |
577 | PeiGetNextVariableName (\r | |
578 | IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,\r | |
579 | IN OUT UINTN *VariableNameSize,\r | |
580 | IN OUT CHAR16 *VariableName,\r | |
581 | IN OUT EFI_GUID *VariableGuid\r | |
582 | )\r | |
8d3a5c82 | 583 | {\r |
584 | VARIABLE_POINTER_TRACK Variable;\r | |
585 | UINTN VarNameSize;\r | |
586 | EFI_STATUS Status;\r | |
284c8400 | 587 | CONST EFI_PEI_SERVICES **PeiServices;\r |
8d3a5c82 | 588 | \r |
589 | PeiServices = GetPeiServicesTablePointer ();\r | |
01f352a7 | 590 | if (VariableName == NULL || VariableGuid == NULL || VariableNameSize == NULL) {\r |
8d3a5c82 | 591 | return EFI_INVALID_PARAMETER;\r |
592 | }\r | |
593 | \r | |
594 | Status = FindVariable (PeiServices, VariableName, VariableGuid, &Variable);\r | |
595 | if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {\r | |
596 | return Status;\r | |
597 | }\r | |
598 | \r | |
599 | if (VariableName[0] != 0) {\r | |
600 | //\r | |
601 | // If variable name is not NULL, get next variable\r | |
602 | //\r | |
603 | Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);\r | |
604 | }\r | |
605 | \r | |
606 | while (!(Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == NULL)) {\r | |
607 | if (IsValidVariableHeader (Variable.CurrPtr)) {\r | |
608 | if (Variable.CurrPtr->State == VAR_ADDED) {\r | |
130e2569 | 609 | ASSERT (NameSizeOfVariable (Variable.CurrPtr) != 0);\r |
9cad030b | 610 | \r |
130e2569 | 611 | VarNameSize = (UINTN) NameSizeOfVariable (Variable.CurrPtr);\r |
8d3a5c82 | 612 | if (VarNameSize <= *VariableNameSize) {\r |
33479ddf | 613 | CopyMem (VariableName, GetVariableNamePtr (Variable.CurrPtr), VarNameSize);\r |
8d3a5c82 | 614 | \r |
33479ddf | 615 | CopyMem (VariableGuid, &Variable.CurrPtr->VendorGuid, sizeof (EFI_GUID));\r |
8d3a5c82 | 616 | \r |
617 | Status = EFI_SUCCESS;\r | |
618 | } else {\r | |
619 | Status = EFI_BUFFER_TOO_SMALL;\r | |
620 | }\r | |
621 | \r | |
622 | *VariableNameSize = VarNameSize;\r | |
623 | return Status;\r | |
624 | //\r | |
625 | // Variable is found\r | |
626 | //\r | |
627 | } else {\r | |
628 | Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);\r | |
629 | }\r | |
630 | } else {\r | |
631 | break;\r | |
632 | }\r | |
633 | }\r | |
634 | \r | |
635 | return EFI_NOT_FOUND;\r | |
636 | }\r |