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b9ec9330 QH |
1 | /*++\r |
2 | \r | |
149d6335 | 3 | Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>\r |
6163cc98 | 4 | This program and the accompanying materials are licensed and made available\r |
b9ec9330 QH |
5 | under the terms and conditions of the BSD License which accompanies this\r |
6 | 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 | \r | |
13 | Module Name:\r | |
14 | \r | |
15 | DiskCache.c\r | |
16 | \r | |
17 | Abstract:\r | |
18 | \r | |
19 | Cache implementation for EFI FAT File system driver\r | |
20 | \r | |
21 | Revision History\r | |
22 | \r | |
23 | --*/\r | |
24 | \r | |
25 | #include "Fat.h"\r | |
26 | \r | |
27 | STATIC\r | |
28 | VOID\r | |
29 | FatFlushDataCacheRange (\r | |
30 | IN FAT_VOLUME *Volume,\r | |
31 | IN IO_MODE IoMode,\r | |
32 | IN UINTN StartPageNo,\r | |
33 | IN UINTN EndPageNo,\r | |
34 | OUT UINT8 *Buffer\r | |
35 | )\r | |
36 | /*++\r | |
37 | \r | |
38 | Routine Description:\r | |
39 | \r | |
40 | This function is used by the Data Cache.\r | |
41 | \r | |
42 | When this function is called by write command, all entries in this range\r | |
43 | are older than the contents in disk, so they are invalid; just mark them invalid.\r | |
44 | \r | |
45 | When this function is called by read command, if any entry in this range\r | |
46 | is dirty, it means that the relative info directly readed from media is older than\r | |
47 | than the info in the cache; So need to update the relative info in the Buffer.\r | |
48 | \r | |
49 | Arguments:\r | |
50 | \r | |
51 | Volume - FAT file system volume.\r | |
52 | IoMode - This function is called by read command or write command\r | |
53 | StartPageNo - First PageNo to be checked in the cache.\r | |
54 | EndPageNo - Last PageNo to be checked in the cache.\r | |
55 | Buffer - The user buffer need to update. Only when doing the read command\r | |
56 | and there is dirty cache in the cache range, this parameter will be used.\r | |
57 | \r | |
58 | Returns:\r | |
59 | \r | |
60 | None.\r | |
61 | \r | |
62 | --*/\r | |
63 | {\r | |
64 | UINTN PageNo;\r | |
65 | UINTN GroupNo;\r | |
66 | UINTN GroupMask;\r | |
67 | UINTN PageSize;\r | |
68 | UINT8 PageAlignment;\r | |
69 | DISK_CACHE *DiskCache;\r | |
70 | CACHE_TAG *CacheTag;\r | |
71 | UINT8 *BaseAddress;\r | |
72 | \r | |
73 | DiskCache = &Volume->DiskCache[CACHE_DATA];\r | |
74 | BaseAddress = DiskCache->CacheBase;\r | |
75 | GroupMask = DiskCache->GroupMask;\r | |
76 | PageAlignment = DiskCache->PageAlignment;\r | |
77 | PageSize = (UINTN)1 << PageAlignment;\r | |
78 | \r | |
79 | for (PageNo = StartPageNo; PageNo < EndPageNo; PageNo++) {\r | |
80 | GroupNo = PageNo & GroupMask;\r | |
81 | CacheTag = &DiskCache->CacheTag[GroupNo];\r | |
82 | if (CacheTag->RealSize > 0 && CacheTag->PageNo == PageNo) {\r | |
83 | //\r | |
84 | // When reading data form disk directly, if some dirty data\r | |
85 | // in cache is in this rang, this data in the Buffer need to\r | |
86 | // be updated with the cache's dirty data.\r | |
87 | //\r | |
88 | if (IoMode == READ_DISK) {\r | |
89 | if (CacheTag->Dirty) {\r | |
90 | CopyMem (\r | |
91 | Buffer + ((PageNo - StartPageNo) << PageAlignment),\r | |
92 | BaseAddress + (GroupNo << PageAlignment),\r | |
93 | PageSize\r | |
94 | );\r | |
95 | }\r | |
96 | } else {\r | |
97 | //\r | |
98 | // Make all valid entries in this range invalid.\r | |
99 | //\r | |
100 | CacheTag->RealSize = 0;\r | |
101 | }\r | |
102 | }\r | |
103 | }\r | |
104 | }\r | |
105 | \r | |
106 | STATIC\r | |
107 | EFI_STATUS\r | |
108 | FatExchangeCachePage (\r | |
109 | IN FAT_VOLUME *Volume,\r | |
110 | IN CACHE_DATA_TYPE DataType,\r | |
111 | IN IO_MODE IoMode,\r | |
149d6335 RN |
112 | IN CACHE_TAG *CacheTag,\r |
113 | IN FAT_TASK *Task\r | |
b9ec9330 QH |
114 | )\r |
115 | /*++\r | |
116 | \r | |
117 | Routine Description:\r | |
118 | \r | |
119 | Exchange the cache page with the image on the disk\r | |
120 | \r | |
121 | Arguments:\r | |
122 | \r | |
123 | Volume - FAT file system volume.\r | |
124 | DataType - Indicate the cache type.\r | |
125 | IoMode - Indicate whether to load this page from disk or store this page to disk.\r | |
126 | CacheTag - The Cache Tag for the current cache page.\r | |
127 | \r | |
128 | Returns:\r | |
129 | \r | |
130 | EFI_SUCCESS - Cache page exchanged successfully.\r | |
131 | Others - An error occurred when exchanging cache page.\r | |
132 | \r | |
133 | --*/\r | |
134 | {\r | |
135 | EFI_STATUS Status;\r | |
136 | UINTN GroupNo;\r | |
137 | UINTN PageNo;\r | |
138 | UINTN WriteCount;\r | |
139 | UINTN RealSize;\r | |
140 | UINT64 EntryPos;\r | |
141 | UINT64 MaxSize;\r | |
142 | DISK_CACHE *DiskCache;\r | |
143 | VOID *PageAddress;\r | |
144 | UINT8 PageAlignment;\r | |
145 | \r | |
146 | DiskCache = &Volume->DiskCache[DataType];\r | |
147 | PageNo = CacheTag->PageNo;\r | |
148 | GroupNo = PageNo & DiskCache->GroupMask;\r | |
149 | PageAlignment = DiskCache->PageAlignment;\r | |
150 | PageAddress = DiskCache->CacheBase + (GroupNo << PageAlignment);\r | |
151 | EntryPos = DiskCache->BaseAddress + LShiftU64 (PageNo, PageAlignment);\r | |
152 | RealSize = CacheTag->RealSize;\r | |
153 | if (IoMode == READ_DISK) {\r | |
154 | RealSize = (UINTN)1 << PageAlignment;\r | |
155 | MaxSize = DiskCache->LimitAddress - EntryPos;\r | |
156 | if (MaxSize < RealSize) {\r | |
157 | DEBUG ((EFI_D_INFO, "FatDiskIo: Cache Page OutBound occurred! \n"));\r | |
158 | RealSize = (UINTN) MaxSize;\r | |
159 | }\r | |
160 | }\r | |
161 | \r | |
162 | WriteCount = 1;\r | |
163 | if (DataType == CACHE_FAT && IoMode == WRITE_DISK) {\r | |
164 | WriteCount = Volume->NumFats;\r | |
165 | }\r | |
166 | \r | |
167 | do {\r | |
168 | //\r | |
169 | // Only fat table writing will execute more than once\r | |
170 | //\r | |
149d6335 | 171 | Status = FatDiskIo (Volume, IoMode, EntryPos, RealSize, PageAddress, Task);\r |
b9ec9330 QH |
172 | if (EFI_ERROR (Status)) {\r |
173 | return Status;\r | |
174 | }\r | |
175 | \r | |
176 | EntryPos += Volume->FatSize;\r | |
177 | } while (--WriteCount > 0);\r | |
178 | \r | |
179 | CacheTag->Dirty = FALSE;\r | |
180 | CacheTag->RealSize = RealSize;\r | |
181 | return EFI_SUCCESS;\r | |
182 | }\r | |
183 | \r | |
184 | STATIC\r | |
185 | EFI_STATUS\r | |
186 | FatGetCachePage (\r | |
187 | IN FAT_VOLUME *Volume,\r | |
188 | IN CACHE_DATA_TYPE CacheDataType,\r | |
189 | IN UINTN PageNo,\r | |
190 | IN CACHE_TAG *CacheTag\r | |
191 | )\r | |
192 | /*++\r | |
193 | \r | |
194 | Routine Description:\r | |
195 | \r | |
196 | Get one cache page by specified PageNo.\r | |
197 | \r | |
198 | Arguments:\r | |
199 | \r | |
200 | Volume - FAT file system volume.\r | |
201 | CacheDataType - The cache type: CACHE_FAT or CACHE_DATA.\r | |
202 | PageNo - PageNo to match with the cache.\r | |
203 | CacheTag - The Cache Tag for the current cache page.\r | |
204 | \r | |
205 | Returns:\r | |
206 | \r | |
207 | EFI_SUCCESS - Get the cache page successfully.\r | |
208 | other - An error occurred when accessing data.\r | |
209 | \r | |
210 | --*/\r | |
211 | {\r | |
212 | EFI_STATUS Status;\r | |
213 | UINTN OldPageNo;\r | |
214 | \r | |
215 | OldPageNo = CacheTag->PageNo;\r | |
216 | if (CacheTag->RealSize > 0 && OldPageNo == PageNo) {\r | |
217 | //\r | |
218 | // Cache Hit occurred\r | |
219 | //\r | |
220 | return EFI_SUCCESS;\r | |
221 | }\r | |
222 | \r | |
223 | //\r | |
224 | // Write dirty cache page back to disk\r | |
225 | //\r | |
226 | if (CacheTag->RealSize > 0 && CacheTag->Dirty) {\r | |
149d6335 | 227 | Status = FatExchangeCachePage (Volume, CacheDataType, WRITE_DISK, CacheTag, NULL);\r |
b9ec9330 QH |
228 | if (EFI_ERROR (Status)) {\r |
229 | return Status;\r | |
230 | }\r | |
231 | }\r | |
232 | //\r | |
233 | // Load new data from disk;\r | |
234 | //\r | |
235 | CacheTag->PageNo = PageNo;\r | |
149d6335 | 236 | Status = FatExchangeCachePage (Volume, CacheDataType, READ_DISK, CacheTag, NULL);\r |
b9ec9330 QH |
237 | \r |
238 | return Status;\r | |
239 | }\r | |
240 | \r | |
241 | STATIC\r | |
242 | EFI_STATUS\r | |
243 | FatAccessUnalignedCachePage (\r | |
244 | IN FAT_VOLUME *Volume,\r | |
245 | IN CACHE_DATA_TYPE CacheDataType,\r | |
246 | IN IO_MODE IoMode,\r | |
247 | IN UINTN PageNo,\r | |
248 | IN UINTN Offset,\r | |
249 | IN UINTN Length,\r | |
250 | IN OUT VOID *Buffer\r | |
251 | )\r | |
252 | /*++\r | |
253 | Routine Description:\r | |
254 | \r | |
255 | Read Length bytes from the position of Offset into Buffer, or\r | |
256 | write Length bytes from Buffer into the position of Offset.\r | |
257 | \r | |
258 | Arguments:\r | |
259 | \r | |
260 | Volume - FAT file system volume.\r | |
261 | CacheDataType - The type of cache: CACHE_DATA or CACHE_FAT.\r | |
262 | IoMode - Indicate the type of disk access.\r | |
263 | PageNo - The number of unaligned cache page.\r | |
264 | Offset - The starting byte of cache page.\r | |
265 | Length - The number of bytes that is read or written\r | |
266 | Buffer - Buffer containing cache data.\r | |
267 | \r | |
268 | Returns:\r | |
269 | \r | |
270 | EFI_SUCCESS - The data was accessed correctly.\r | |
271 | Others - An error occurred when accessing unaligned cache page.\r | |
272 | \r | |
273 | --*/\r | |
274 | {\r | |
275 | EFI_STATUS Status;\r | |
276 | VOID *Source;\r | |
277 | VOID *Destination;\r | |
278 | DISK_CACHE *DiskCache;\r | |
279 | CACHE_TAG *CacheTag;\r | |
280 | UINTN GroupNo;\r | |
281 | \r | |
282 | DiskCache = &Volume->DiskCache[CacheDataType];\r | |
283 | GroupNo = PageNo & DiskCache->GroupMask;\r | |
284 | CacheTag = &DiskCache->CacheTag[GroupNo];\r | |
285 | Status = FatGetCachePage (Volume, CacheDataType, PageNo, CacheTag);\r | |
286 | if (!EFI_ERROR (Status)) {\r | |
287 | Source = DiskCache->CacheBase + (GroupNo << DiskCache->PageAlignment) + Offset;\r | |
288 | Destination = Buffer;\r | |
289 | if (IoMode != READ_DISK) {\r | |
290 | CacheTag->Dirty = TRUE;\r | |
291 | DiskCache->Dirty = TRUE;\r | |
292 | Destination = Source;\r | |
293 | Source = Buffer;\r | |
294 | }\r | |
295 | \r | |
296 | CopyMem (Destination, Source, Length);\r | |
297 | }\r | |
298 | \r | |
299 | return Status;\r | |
300 | }\r | |
301 | \r | |
302 | EFI_STATUS\r | |
303 | FatAccessCache (\r | |
304 | IN FAT_VOLUME *Volume,\r | |
305 | IN CACHE_DATA_TYPE CacheDataType,\r | |
306 | IN IO_MODE IoMode,\r | |
307 | IN UINT64 Offset,\r | |
308 | IN UINTN BufferSize,\r | |
149d6335 RN |
309 | IN OUT UINT8 *Buffer,\r |
310 | IN FAT_TASK *Task\r | |
b9ec9330 QH |
311 | )\r |
312 | /*++\r | |
313 | Routine Description:\r | |
314 | \r | |
315 | Read BufferSize bytes from the position of Offset into Buffer,\r | |
316 | or write BufferSize bytes from Buffer into the position of Offset.\r | |
317 | \r | |
318 | Base on the parameter of CACHE_DATA_TYPE, the data access will be divided into\r | |
319 | the access of FAT cache (CACHE_FAT) and the access of Data cache (CACHE_DATA):\r | |
320 | \r | |
321 | 1. Access of FAT cache (CACHE_FAT): Access the data in the FAT cache, if there is cache\r | |
322 | page hit, just return the cache page; else update the related cache page and return\r | |
323 | the right cache page.\r | |
324 | 2. Access of Data cache (CACHE_DATA):\r | |
325 | The access data will be divided into UnderRun data, Aligned data and OverRun data;\r | |
326 | The UnderRun data and OverRun data will be accessed by the Data cache,\r | |
327 | but the Aligned data will be accessed with disk directly.\r | |
328 | \r | |
329 | Arguments:\r | |
330 | \r | |
331 | Volume - FAT file system volume.\r | |
332 | CacheDataType - The type of cache: CACHE_DATA or CACHE_FAT.\r | |
333 | IoMode - Indicate the type of disk access.\r | |
334 | Offset - The starting byte offset to read from.\r | |
335 | BufferSize - Size of Buffer.\r | |
336 | Buffer - Buffer containing cache data.\r | |
337 | \r | |
338 | Returns:\r | |
339 | \r | |
340 | EFI_SUCCESS - The data was accessed correctly.\r | |
341 | EFI_MEDIA_CHANGED - The MediaId does not match the current device.\r | |
342 | Others - An error occurred when accessing cache.\r | |
343 | \r | |
344 | --*/\r | |
345 | {\r | |
346 | EFI_STATUS Status;\r | |
347 | UINTN PageSize;\r | |
348 | UINTN UnderRun;\r | |
349 | UINTN OverRun;\r | |
350 | UINTN AlignedSize;\r | |
351 | UINTN Length;\r | |
352 | UINTN PageNo;\r | |
353 | UINTN AlignedPageCount;\r | |
354 | UINTN OverRunPageNo;\r | |
355 | DISK_CACHE *DiskCache;\r | |
356 | UINT64 EntryPos;\r | |
357 | UINT8 PageAlignment;\r | |
358 | \r | |
359 | ASSERT (Volume->CacheBuffer != NULL);\r | |
360 | \r | |
361 | Status = EFI_SUCCESS;\r | |
362 | DiskCache = &Volume->DiskCache[CacheDataType];\r | |
363 | EntryPos = Offset - DiskCache->BaseAddress;\r | |
364 | PageAlignment = DiskCache->PageAlignment;\r | |
365 | PageSize = (UINTN)1 << PageAlignment;\r | |
366 | PageNo = (UINTN) RShiftU64 (EntryPos, PageAlignment);\r | |
367 | UnderRun = ((UINTN) EntryPos) & (PageSize - 1);\r | |
368 | \r | |
369 | if (UnderRun > 0) {\r | |
370 | Length = PageSize - UnderRun;\r | |
371 | if (Length > BufferSize) {\r | |
372 | Length = BufferSize;\r | |
373 | }\r | |
374 | \r | |
375 | Status = FatAccessUnalignedCachePage (Volume, CacheDataType, IoMode, PageNo, UnderRun, Length, Buffer);\r | |
376 | if (EFI_ERROR (Status)) {\r | |
377 | return Status;\r | |
378 | }\r | |
379 | \r | |
380 | Buffer += Length;\r | |
381 | BufferSize -= Length;\r | |
382 | PageNo++;\r | |
383 | }\r | |
384 | \r | |
385 | AlignedPageCount = BufferSize >> PageAlignment;\r | |
386 | OverRunPageNo = PageNo + AlignedPageCount;\r | |
387 | //\r | |
388 | // The access of the Aligned data\r | |
389 | //\r | |
390 | if (AlignedPageCount > 0) {\r | |
391 | //\r | |
392 | // Accessing fat table cannot have alignment data\r | |
393 | //\r | |
394 | ASSERT (CacheDataType == CACHE_DATA);\r | |
395 | \r | |
396 | EntryPos = Volume->RootPos + LShiftU64 (PageNo, PageAlignment);\r | |
397 | AlignedSize = AlignedPageCount << PageAlignment;\r | |
149d6335 | 398 | Status = FatDiskIo (Volume, IoMode, EntryPos, AlignedSize, Buffer, Task);\r |
b9ec9330 QH |
399 | if (EFI_ERROR (Status)) {\r |
400 | return Status;\r | |
401 | }\r | |
402 | //\r | |
403 | // If these access data over laps the relative cache range, these cache pages need\r | |
404 | // to be updated.\r | |
405 | //\r | |
406 | FatFlushDataCacheRange (Volume, IoMode, PageNo, OverRunPageNo, Buffer);\r | |
407 | Buffer += AlignedSize;\r | |
408 | BufferSize -= AlignedSize;\r | |
409 | }\r | |
410 | //\r | |
411 | // The access of the OverRun data\r | |
412 | //\r | |
413 | OverRun = BufferSize;\r | |
414 | if (OverRun > 0) {\r | |
415 | //\r | |
416 | // Last read is not a complete page\r | |
417 | //\r | |
418 | Status = FatAccessUnalignedCachePage (Volume, CacheDataType, IoMode, OverRunPageNo, 0, OverRun, Buffer);\r | |
419 | }\r | |
420 | \r | |
421 | return Status;\r | |
422 | }\r | |
423 | \r | |
424 | EFI_STATUS\r | |
425 | FatVolumeFlushCache (\r | |
149d6335 RN |
426 | IN FAT_VOLUME *Volume,\r |
427 | IN FAT_TASK *Task\r | |
b9ec9330 QH |
428 | )\r |
429 | /*++\r | |
430 | \r | |
431 | Routine Description:\r | |
432 | \r | |
433 | Flush all the dirty cache back, include the FAT cache and the Data cache.\r | |
434 | \r | |
435 | Arguments:\r | |
436 | \r | |
437 | Volume - FAT file system volume.\r | |
438 | \r | |
439 | Returns:\r | |
440 | \r | |
441 | EFI_SUCCESS - Flush all the dirty cache back successfully\r | |
442 | other - An error occurred when writing the data into the disk\r | |
443 | \r | |
444 | --*/\r | |
445 | {\r | |
446 | EFI_STATUS Status;\r | |
447 | CACHE_DATA_TYPE CacheDataType;\r | |
448 | UINTN GroupIndex;\r | |
449 | UINTN GroupMask;\r | |
450 | DISK_CACHE *DiskCache;\r | |
451 | CACHE_TAG *CacheTag;\r | |
452 | \r | |
453 | for (CacheDataType = (CACHE_DATA_TYPE) 0; CacheDataType < CACHE_MAX_TYPE; CacheDataType++) {\r | |
454 | DiskCache = &Volume->DiskCache[CacheDataType];\r | |
455 | if (DiskCache->Dirty) {\r | |
456 | //\r | |
457 | // Data cache or fat cache is dirty, write the dirty data back\r | |
458 | //\r | |
459 | GroupMask = DiskCache->GroupMask;\r | |
460 | for (GroupIndex = 0; GroupIndex <= GroupMask; GroupIndex++) {\r | |
461 | CacheTag = &DiskCache->CacheTag[GroupIndex];\r | |
462 | if (CacheTag->RealSize > 0 && CacheTag->Dirty) {\r | |
463 | //\r | |
464 | // Write back all Dirty Data Cache Page to disk\r | |
465 | //\r | |
149d6335 | 466 | Status = FatExchangeCachePage (Volume, CacheDataType, WRITE_DISK, CacheTag, Task);\r |
b9ec9330 QH |
467 | if (EFI_ERROR (Status)) {\r |
468 | return Status;\r | |
469 | }\r | |
470 | }\r | |
471 | }\r | |
472 | \r | |
473 | DiskCache->Dirty = FALSE;\r | |
474 | }\r | |
475 | }\r | |
476 | //\r | |
477 | // Flush the block device.\r | |
478 | //\r | |
479 | Status = Volume->BlockIo->FlushBlocks (Volume->BlockIo);\r | |
480 | return Status;\r | |
481 | }\r | |
482 | \r | |
483 | EFI_STATUS\r | |
484 | FatInitializeDiskCache (\r | |
485 | IN FAT_VOLUME *Volume\r | |
486 | )\r | |
487 | /*++\r | |
488 | \r | |
489 | Routine Description:\r | |
490 | \r | |
491 | Initialize the disk cache according to Volume's FatType.\r | |
492 | \r | |
493 | Arguments:\r | |
494 | \r | |
495 | Volume - FAT file system volume.\r | |
496 | \r | |
497 | Returns:\r | |
498 | \r | |
499 | EFI_SUCCESS - The disk cache is successfully initialized.\r | |
500 | EFI_OUT_OF_RESOURCES - Not enough memory to allocate disk cache.\r | |
501 | \r | |
502 | --*/\r | |
503 | {\r | |
504 | DISK_CACHE *DiskCache;\r | |
505 | UINTN FatCacheGroupCount;\r | |
506 | UINTN DataCacheSize;\r | |
507 | UINTN FatCacheSize;\r | |
508 | UINT8 *CacheBuffer;\r | |
509 | \r | |
510 | DiskCache = Volume->DiskCache;\r | |
511 | //\r | |
512 | // Configure the parameters of disk cache\r | |
513 | //\r | |
514 | if (Volume->FatType == FAT12) {\r | |
515 | FatCacheGroupCount = FAT_FATCACHE_GROUP_MIN_COUNT;\r | |
516 | DiskCache[CACHE_FAT].PageAlignment = FAT_FATCACHE_PAGE_MIN_ALIGNMENT;\r | |
517 | DiskCache[CACHE_DATA].PageAlignment = FAT_DATACACHE_PAGE_MIN_ALIGNMENT;\r | |
518 | } else {\r | |
519 | FatCacheGroupCount = FAT_FATCACHE_GROUP_MAX_COUNT;\r | |
520 | DiskCache[CACHE_FAT].PageAlignment = FAT_FATCACHE_PAGE_MAX_ALIGNMENT;\r | |
521 | DiskCache[CACHE_DATA].PageAlignment = FAT_DATACACHE_PAGE_MAX_ALIGNMENT;\r | |
522 | }\r | |
523 | \r | |
524 | DiskCache[CACHE_DATA].GroupMask = FAT_DATACACHE_GROUP_COUNT - 1;\r | |
525 | DiskCache[CACHE_DATA].BaseAddress = Volume->RootPos;\r | |
526 | DiskCache[CACHE_DATA].LimitAddress = Volume->VolumeSize;\r | |
527 | DiskCache[CACHE_FAT].GroupMask = FatCacheGroupCount - 1;\r | |
528 | DiskCache[CACHE_FAT].BaseAddress = Volume->FatPos;\r | |
529 | DiskCache[CACHE_FAT].LimitAddress = Volume->FatPos + Volume->FatSize;\r | |
530 | FatCacheSize = FatCacheGroupCount << DiskCache[CACHE_FAT].PageAlignment;\r | |
531 | DataCacheSize = FAT_DATACACHE_GROUP_COUNT << DiskCache[CACHE_DATA].PageAlignment;\r | |
532 | //\r | |
533 | // Allocate the Fat Cache buffer\r | |
534 | //\r | |
f4500fc1 | 535 | CacheBuffer = AllocateZeroPool (FatCacheSize + DataCacheSize);\r |
b9ec9330 QH |
536 | if (CacheBuffer == NULL) {\r |
537 | return EFI_OUT_OF_RESOURCES;\r | |
538 | }\r | |
539 | \r | |
540 | Volume->CacheBuffer = CacheBuffer;\r | |
541 | DiskCache[CACHE_FAT].CacheBase = CacheBuffer;\r | |
542 | DiskCache[CACHE_DATA].CacheBase = CacheBuffer + FatCacheSize;\r | |
543 | return EFI_SUCCESS;\r | |
544 | }\r |