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cae7420b DB |
1 | /** @file\r |
2 | Cache implementation for EFI FAT File system driver.\r | |
b9ec9330 | 3 | \r |
149d6335 | 4 | Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>\r |
eb6cb4ce | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
b9ec9330 | 6 | \r |
cae7420b | 7 | **/\r |
b9ec9330 | 8 | \r |
cae7420b | 9 | #include "Fat.h"\r |
b9ec9330 | 10 | \r |
cae7420b | 11 | /**\r |
b9ec9330 | 12 | \r |
cae7420b | 13 | This function is used by the Data Cache.\r |
b9ec9330 | 14 | \r |
cae7420b DB |
15 | When this function is called by write command, all entries in this range\r |
16 | are older than the contents in disk, so they are invalid; just mark them invalid.\r | |
b9ec9330 | 17 | \r |
cae7420b DB |
18 | When this function is called by read command, if any entry in this range\r |
19 | is dirty, it means that the relative info directly readed from media is older than\r | |
20 | than the info in the cache; So need to update the relative info in the Buffer.\r | |
b9ec9330 | 21 | \r |
cae7420b DB |
22 | @param Volume - FAT file system volume.\r |
23 | @param IoMode - This function is called by read command or write command\r | |
24 | @param StartPageNo - First PageNo to be checked in the cache.\r | |
25 | @param EndPageNo - Last PageNo to be checked in the cache.\r | |
26 | @param Buffer - The user buffer need to update. Only when doing the read command\r | |
27 | and there is dirty cache in the cache range, this parameter will be used.\r | |
b9ec9330 | 28 | \r |
cae7420b | 29 | **/\r |
b9ec9330 QH |
30 | STATIC\r |
31 | VOID\r | |
32 | FatFlushDataCacheRange (\r | |
33 | IN FAT_VOLUME *Volume,\r | |
34 | IN IO_MODE IoMode,\r | |
35 | IN UINTN StartPageNo,\r | |
36 | IN UINTN EndPageNo,\r | |
37 | OUT UINT8 *Buffer\r | |
38 | )\r | |
b9ec9330 QH |
39 | {\r |
40 | UINTN PageNo;\r | |
41 | UINTN GroupNo;\r | |
42 | UINTN GroupMask;\r | |
43 | UINTN PageSize;\r | |
44 | UINT8 PageAlignment;\r | |
45 | DISK_CACHE *DiskCache;\r | |
46 | CACHE_TAG *CacheTag;\r | |
47 | UINT8 *BaseAddress;\r | |
48 | \r | |
c1680e88 | 49 | DiskCache = &Volume->DiskCache[CacheData];\r |
b9ec9330 QH |
50 | BaseAddress = DiskCache->CacheBase;\r |
51 | GroupMask = DiskCache->GroupMask;\r | |
52 | PageAlignment = DiskCache->PageAlignment;\r | |
53 | PageSize = (UINTN)1 << PageAlignment;\r | |
54 | \r | |
55 | for (PageNo = StartPageNo; PageNo < EndPageNo; PageNo++) {\r | |
56 | GroupNo = PageNo & GroupMask;\r | |
57 | CacheTag = &DiskCache->CacheTag[GroupNo];\r | |
58 | if (CacheTag->RealSize > 0 && CacheTag->PageNo == PageNo) {\r | |
59 | //\r | |
60 | // When reading data form disk directly, if some dirty data\r | |
61 | // in cache is in this rang, this data in the Buffer need to\r | |
62 | // be updated with the cache's dirty data.\r | |
63 | //\r | |
c1680e88 | 64 | if (IoMode == ReadDisk) {\r |
b9ec9330 QH |
65 | if (CacheTag->Dirty) {\r |
66 | CopyMem (\r | |
67 | Buffer + ((PageNo - StartPageNo) << PageAlignment),\r | |
68 | BaseAddress + (GroupNo << PageAlignment),\r | |
69 | PageSize\r | |
70 | );\r | |
71 | }\r | |
72 | } else {\r | |
73 | //\r | |
74 | // Make all valid entries in this range invalid.\r | |
75 | //\r | |
76 | CacheTag->RealSize = 0;\r | |
77 | }\r | |
78 | }\r | |
79 | }\r | |
80 | }\r | |
81 | \r | |
cae7420b DB |
82 | /**\r |
83 | \r | |
84 | Exchange the cache page with the image on the disk\r | |
85 | \r | |
86 | @param Volume - FAT file system volume.\r | |
87 | @param DataType - Indicate the cache type.\r | |
88 | @param IoMode - Indicate whether to load this page from disk or store this page to disk.\r | |
89 | @param CacheTag - The Cache Tag for the current cache page.\r | |
90 | @param Task point to task instance.\r | |
91 | \r | |
92 | @retval EFI_SUCCESS - Cache page exchanged successfully.\r | |
93 | @return Others - An error occurred when exchanging cache page.\r | |
94 | \r | |
95 | **/\r | |
b9ec9330 QH |
96 | STATIC\r |
97 | EFI_STATUS\r | |
98 | FatExchangeCachePage (\r | |
99 | IN FAT_VOLUME *Volume,\r | |
100 | IN CACHE_DATA_TYPE DataType,\r | |
101 | IN IO_MODE IoMode,\r | |
149d6335 RN |
102 | IN CACHE_TAG *CacheTag,\r |
103 | IN FAT_TASK *Task\r | |
b9ec9330 | 104 | )\r |
b9ec9330 QH |
105 | {\r |
106 | EFI_STATUS Status;\r | |
107 | UINTN GroupNo;\r | |
108 | UINTN PageNo;\r | |
109 | UINTN WriteCount;\r | |
110 | UINTN RealSize;\r | |
111 | UINT64 EntryPos;\r | |
112 | UINT64 MaxSize;\r | |
113 | DISK_CACHE *DiskCache;\r | |
114 | VOID *PageAddress;\r | |
115 | UINT8 PageAlignment;\r | |
116 | \r | |
117 | DiskCache = &Volume->DiskCache[DataType];\r | |
118 | PageNo = CacheTag->PageNo;\r | |
119 | GroupNo = PageNo & DiskCache->GroupMask;\r | |
120 | PageAlignment = DiskCache->PageAlignment;\r | |
121 | PageAddress = DiskCache->CacheBase + (GroupNo << PageAlignment);\r | |
122 | EntryPos = DiskCache->BaseAddress + LShiftU64 (PageNo, PageAlignment);\r | |
123 | RealSize = CacheTag->RealSize;\r | |
c1680e88 | 124 | if (IoMode == ReadDisk) {\r |
b9ec9330 QH |
125 | RealSize = (UINTN)1 << PageAlignment;\r |
126 | MaxSize = DiskCache->LimitAddress - EntryPos;\r | |
127 | if (MaxSize < RealSize) {\r | |
128 | DEBUG ((EFI_D_INFO, "FatDiskIo: Cache Page OutBound occurred! \n"));\r | |
129 | RealSize = (UINTN) MaxSize;\r | |
130 | }\r | |
131 | }\r | |
132 | \r | |
133 | WriteCount = 1;\r | |
c1680e88 | 134 | if (DataType == CacheFat && IoMode == WriteDisk) {\r |
b9ec9330 QH |
135 | WriteCount = Volume->NumFats;\r |
136 | }\r | |
137 | \r | |
138 | do {\r | |
139 | //\r | |
140 | // Only fat table writing will execute more than once\r | |
141 | //\r | |
149d6335 | 142 | Status = FatDiskIo (Volume, IoMode, EntryPos, RealSize, PageAddress, Task);\r |
b9ec9330 QH |
143 | if (EFI_ERROR (Status)) {\r |
144 | return Status;\r | |
145 | }\r | |
146 | \r | |
147 | EntryPos += Volume->FatSize;\r | |
148 | } while (--WriteCount > 0);\r | |
149 | \r | |
150 | CacheTag->Dirty = FALSE;\r | |
151 | CacheTag->RealSize = RealSize;\r | |
152 | return EFI_SUCCESS;\r | |
153 | }\r | |
154 | \r | |
cae7420b DB |
155 | /**\r |
156 | \r | |
157 | Get one cache page by specified PageNo.\r | |
158 | \r | |
159 | @param Volume - FAT file system volume.\r | |
160 | @param CacheDataType - The cache type: CACHE_FAT or CACHE_DATA.\r | |
161 | @param PageNo - PageNo to match with the cache.\r | |
162 | @param CacheTag - The Cache Tag for the current cache page.\r | |
163 | \r | |
164 | @retval EFI_SUCCESS - Get the cache page successfully.\r | |
165 | @return other - An error occurred when accessing data.\r | |
166 | \r | |
167 | **/\r | |
b9ec9330 QH |
168 | STATIC\r |
169 | EFI_STATUS\r | |
170 | FatGetCachePage (\r | |
171 | IN FAT_VOLUME *Volume,\r | |
172 | IN CACHE_DATA_TYPE CacheDataType,\r | |
173 | IN UINTN PageNo,\r | |
174 | IN CACHE_TAG *CacheTag\r | |
175 | )\r | |
b9ec9330 QH |
176 | {\r |
177 | EFI_STATUS Status;\r | |
178 | UINTN OldPageNo;\r | |
179 | \r | |
180 | OldPageNo = CacheTag->PageNo;\r | |
181 | if (CacheTag->RealSize > 0 && OldPageNo == PageNo) {\r | |
182 | //\r | |
183 | // Cache Hit occurred\r | |
184 | //\r | |
185 | return EFI_SUCCESS;\r | |
186 | }\r | |
187 | \r | |
188 | //\r | |
189 | // Write dirty cache page back to disk\r | |
190 | //\r | |
191 | if (CacheTag->RealSize > 0 && CacheTag->Dirty) {\r | |
c1680e88 | 192 | Status = FatExchangeCachePage (Volume, CacheDataType, WriteDisk, CacheTag, NULL);\r |
b9ec9330 QH |
193 | if (EFI_ERROR (Status)) {\r |
194 | return Status;\r | |
195 | }\r | |
196 | }\r | |
197 | //\r | |
198 | // Load new data from disk;\r | |
199 | //\r | |
200 | CacheTag->PageNo = PageNo;\r | |
c1680e88 | 201 | Status = FatExchangeCachePage (Volume, CacheDataType, ReadDisk, CacheTag, NULL);\r |
b9ec9330 QH |
202 | \r |
203 | return Status;\r | |
204 | }\r | |
205 | \r | |
cae7420b DB |
206 | /**\r |
207 | \r | |
208 | Read Length bytes from the position of Offset into Buffer, or\r | |
209 | write Length bytes from Buffer into the position of Offset.\r | |
210 | \r | |
211 | @param Volume - FAT file system volume.\r | |
212 | @param CacheDataType - The type of cache: CACHE_DATA or CACHE_FAT.\r | |
213 | @param IoMode - Indicate the type of disk access.\r | |
214 | @param PageNo - The number of unaligned cache page.\r | |
215 | @param Offset - The starting byte of cache page.\r | |
216 | @param Length - The number of bytes that is read or written\r | |
217 | @param Buffer - Buffer containing cache data.\r | |
218 | \r | |
219 | @retval EFI_SUCCESS - The data was accessed correctly.\r | |
220 | @return Others - An error occurred when accessing unaligned cache page.\r | |
221 | \r | |
222 | **/\r | |
b9ec9330 QH |
223 | STATIC\r |
224 | EFI_STATUS\r | |
225 | FatAccessUnalignedCachePage (\r | |
226 | IN FAT_VOLUME *Volume,\r | |
227 | IN CACHE_DATA_TYPE CacheDataType,\r | |
228 | IN IO_MODE IoMode,\r | |
229 | IN UINTN PageNo,\r | |
230 | IN UINTN Offset,\r | |
231 | IN UINTN Length,\r | |
232 | IN OUT VOID *Buffer\r | |
233 | )\r | |
b9ec9330 QH |
234 | {\r |
235 | EFI_STATUS Status;\r | |
236 | VOID *Source;\r | |
237 | VOID *Destination;\r | |
238 | DISK_CACHE *DiskCache;\r | |
239 | CACHE_TAG *CacheTag;\r | |
240 | UINTN GroupNo;\r | |
241 | \r | |
242 | DiskCache = &Volume->DiskCache[CacheDataType];\r | |
243 | GroupNo = PageNo & DiskCache->GroupMask;\r | |
244 | CacheTag = &DiskCache->CacheTag[GroupNo];\r | |
245 | Status = FatGetCachePage (Volume, CacheDataType, PageNo, CacheTag);\r | |
246 | if (!EFI_ERROR (Status)) {\r | |
247 | Source = DiskCache->CacheBase + (GroupNo << DiskCache->PageAlignment) + Offset;\r | |
248 | Destination = Buffer;\r | |
c1680e88 | 249 | if (IoMode != ReadDisk) {\r |
b9ec9330 QH |
250 | CacheTag->Dirty = TRUE;\r |
251 | DiskCache->Dirty = TRUE;\r | |
252 | Destination = Source;\r | |
253 | Source = Buffer;\r | |
254 | }\r | |
255 | \r | |
256 | CopyMem (Destination, Source, Length);\r | |
257 | }\r | |
258 | \r | |
259 | return Status;\r | |
260 | }\r | |
261 | \r | |
cae7420b | 262 | /**\r |
b9ec9330 QH |
263 | \r |
264 | Read BufferSize bytes from the position of Offset into Buffer,\r | |
265 | or write BufferSize bytes from Buffer into the position of Offset.\r | |
266 | \r | |
267 | Base on the parameter of CACHE_DATA_TYPE, the data access will be divided into\r | |
268 | the access of FAT cache (CACHE_FAT) and the access of Data cache (CACHE_DATA):\r | |
269 | \r | |
270 | 1. Access of FAT cache (CACHE_FAT): Access the data in the FAT cache, if there is cache\r | |
271 | page hit, just return the cache page; else update the related cache page and return\r | |
272 | the right cache page.\r | |
273 | 2. Access of Data cache (CACHE_DATA):\r | |
274 | The access data will be divided into UnderRun data, Aligned data and OverRun data;\r | |
275 | The UnderRun data and OverRun data will be accessed by the Data cache,\r | |
276 | but the Aligned data will be accessed with disk directly.\r | |
277 | \r | |
cae7420b DB |
278 | @param Volume - FAT file system volume.\r |
279 | @param CacheDataType - The type of cache: CACHE_DATA or CACHE_FAT.\r | |
280 | @param IoMode - Indicate the type of disk access.\r | |
281 | @param Offset - The starting byte offset to read from.\r | |
282 | @param BufferSize - Size of Buffer.\r | |
283 | @param Buffer - Buffer containing cache data.\r | |
284 | @param Task point to task instance.\r | |
b9ec9330 | 285 | \r |
cae7420b DB |
286 | @retval EFI_SUCCESS - The data was accessed correctly.\r |
287 | @retval EFI_MEDIA_CHANGED - The MediaId does not match the current device.\r | |
288 | @return Others - An error occurred when accessing cache.\r | |
b9ec9330 | 289 | \r |
cae7420b DB |
290 | **/\r |
291 | EFI_STATUS\r | |
292 | FatAccessCache (\r | |
293 | IN FAT_VOLUME *Volume,\r | |
294 | IN CACHE_DATA_TYPE CacheDataType,\r | |
295 | IN IO_MODE IoMode,\r | |
296 | IN UINT64 Offset,\r | |
297 | IN UINTN BufferSize,\r | |
298 | IN OUT UINT8 *Buffer,\r | |
299 | IN FAT_TASK *Task\r | |
300 | )\r | |
b9ec9330 QH |
301 | {\r |
302 | EFI_STATUS Status;\r | |
303 | UINTN PageSize;\r | |
304 | UINTN UnderRun;\r | |
305 | UINTN OverRun;\r | |
306 | UINTN AlignedSize;\r | |
307 | UINTN Length;\r | |
308 | UINTN PageNo;\r | |
309 | UINTN AlignedPageCount;\r | |
310 | UINTN OverRunPageNo;\r | |
311 | DISK_CACHE *DiskCache;\r | |
312 | UINT64 EntryPos;\r | |
313 | UINT8 PageAlignment;\r | |
314 | \r | |
315 | ASSERT (Volume->CacheBuffer != NULL);\r | |
316 | \r | |
317 | Status = EFI_SUCCESS;\r | |
318 | DiskCache = &Volume->DiskCache[CacheDataType];\r | |
319 | EntryPos = Offset - DiskCache->BaseAddress;\r | |
320 | PageAlignment = DiskCache->PageAlignment;\r | |
321 | PageSize = (UINTN)1 << PageAlignment;\r | |
322 | PageNo = (UINTN) RShiftU64 (EntryPos, PageAlignment);\r | |
323 | UnderRun = ((UINTN) EntryPos) & (PageSize - 1);\r | |
324 | \r | |
325 | if (UnderRun > 0) {\r | |
326 | Length = PageSize - UnderRun;\r | |
327 | if (Length > BufferSize) {\r | |
328 | Length = BufferSize;\r | |
329 | }\r | |
330 | \r | |
331 | Status = FatAccessUnalignedCachePage (Volume, CacheDataType, IoMode, PageNo, UnderRun, Length, Buffer);\r | |
332 | if (EFI_ERROR (Status)) {\r | |
333 | return Status;\r | |
334 | }\r | |
335 | \r | |
336 | Buffer += Length;\r | |
337 | BufferSize -= Length;\r | |
338 | PageNo++;\r | |
339 | }\r | |
340 | \r | |
341 | AlignedPageCount = BufferSize >> PageAlignment;\r | |
342 | OverRunPageNo = PageNo + AlignedPageCount;\r | |
343 | //\r | |
344 | // The access of the Aligned data\r | |
345 | //\r | |
346 | if (AlignedPageCount > 0) {\r | |
347 | //\r | |
348 | // Accessing fat table cannot have alignment data\r | |
349 | //\r | |
c1680e88 | 350 | ASSERT (CacheDataType == CacheData);\r |
b9ec9330 QH |
351 | \r |
352 | EntryPos = Volume->RootPos + LShiftU64 (PageNo, PageAlignment);\r | |
353 | AlignedSize = AlignedPageCount << PageAlignment;\r | |
149d6335 | 354 | Status = FatDiskIo (Volume, IoMode, EntryPos, AlignedSize, Buffer, Task);\r |
b9ec9330 QH |
355 | if (EFI_ERROR (Status)) {\r |
356 | return Status;\r | |
357 | }\r | |
358 | //\r | |
359 | // If these access data over laps the relative cache range, these cache pages need\r | |
360 | // to be updated.\r | |
361 | //\r | |
362 | FatFlushDataCacheRange (Volume, IoMode, PageNo, OverRunPageNo, Buffer);\r | |
363 | Buffer += AlignedSize;\r | |
364 | BufferSize -= AlignedSize;\r | |
365 | }\r | |
366 | //\r | |
367 | // The access of the OverRun data\r | |
368 | //\r | |
369 | OverRun = BufferSize;\r | |
370 | if (OverRun > 0) {\r | |
371 | //\r | |
372 | // Last read is not a complete page\r | |
373 | //\r | |
374 | Status = FatAccessUnalignedCachePage (Volume, CacheDataType, IoMode, OverRunPageNo, 0, OverRun, Buffer);\r | |
375 | }\r | |
376 | \r | |
377 | return Status;\r | |
378 | }\r | |
379 | \r | |
cae7420b | 380 | /**\r |
b9ec9330 QH |
381 | \r |
382 | Flush all the dirty cache back, include the FAT cache and the Data cache.\r | |
383 | \r | |
cae7420b DB |
384 | @param Volume - FAT file system volume.\r |
385 | @param Task point to task instance.\r | |
b9ec9330 | 386 | \r |
cae7420b DB |
387 | @retval EFI_SUCCESS - Flush all the dirty cache back successfully\r |
388 | @return other - An error occurred when writing the data into the disk\r | |
b9ec9330 | 389 | \r |
cae7420b DB |
390 | **/\r |
391 | EFI_STATUS\r | |
392 | FatVolumeFlushCache (\r | |
393 | IN FAT_VOLUME *Volume,\r | |
394 | IN FAT_TASK *Task\r | |
395 | )\r | |
b9ec9330 QH |
396 | {\r |
397 | EFI_STATUS Status;\r | |
398 | CACHE_DATA_TYPE CacheDataType;\r | |
399 | UINTN GroupIndex;\r | |
400 | UINTN GroupMask;\r | |
401 | DISK_CACHE *DiskCache;\r | |
402 | CACHE_TAG *CacheTag;\r | |
403 | \r | |
c1680e88 | 404 | for (CacheDataType = (CACHE_DATA_TYPE) 0; CacheDataType < CacheMaxType; CacheDataType++) {\r |
b9ec9330 QH |
405 | DiskCache = &Volume->DiskCache[CacheDataType];\r |
406 | if (DiskCache->Dirty) {\r | |
407 | //\r | |
408 | // Data cache or fat cache is dirty, write the dirty data back\r | |
409 | //\r | |
410 | GroupMask = DiskCache->GroupMask;\r | |
411 | for (GroupIndex = 0; GroupIndex <= GroupMask; GroupIndex++) {\r | |
412 | CacheTag = &DiskCache->CacheTag[GroupIndex];\r | |
413 | if (CacheTag->RealSize > 0 && CacheTag->Dirty) {\r | |
414 | //\r | |
415 | // Write back all Dirty Data Cache Page to disk\r | |
416 | //\r | |
c1680e88 | 417 | Status = FatExchangeCachePage (Volume, CacheDataType, WriteDisk, CacheTag, Task);\r |
b9ec9330 QH |
418 | if (EFI_ERROR (Status)) {\r |
419 | return Status;\r | |
420 | }\r | |
421 | }\r | |
422 | }\r | |
423 | \r | |
424 | DiskCache->Dirty = FALSE;\r | |
425 | }\r | |
426 | }\r | |
427 | //\r | |
428 | // Flush the block device.\r | |
429 | //\r | |
430 | Status = Volume->BlockIo->FlushBlocks (Volume->BlockIo);\r | |
431 | return Status;\r | |
432 | }\r | |
433 | \r | |
cae7420b | 434 | /**\r |
b9ec9330 QH |
435 | \r |
436 | Initialize the disk cache according to Volume's FatType.\r | |
437 | \r | |
cae7420b | 438 | @param Volume - FAT file system volume.\r |
b9ec9330 | 439 | \r |
cae7420b DB |
440 | @retval EFI_SUCCESS - The disk cache is successfully initialized.\r |
441 | @retval EFI_OUT_OF_RESOURCES - Not enough memory to allocate disk cache.\r | |
b9ec9330 | 442 | \r |
cae7420b DB |
443 | **/\r |
444 | EFI_STATUS\r | |
445 | FatInitializeDiskCache (\r | |
446 | IN FAT_VOLUME *Volume\r | |
447 | )\r | |
b9ec9330 QH |
448 | {\r |
449 | DISK_CACHE *DiskCache;\r | |
450 | UINTN FatCacheGroupCount;\r | |
451 | UINTN DataCacheSize;\r | |
452 | UINTN FatCacheSize;\r | |
453 | UINT8 *CacheBuffer;\r | |
454 | \r | |
455 | DiskCache = Volume->DiskCache;\r | |
456 | //\r | |
457 | // Configure the parameters of disk cache\r | |
458 | //\r | |
c1680e88 | 459 | if (Volume->FatType == Fat12) {\r |
b9ec9330 | 460 | FatCacheGroupCount = FAT_FATCACHE_GROUP_MIN_COUNT;\r |
c1680e88 DB |
461 | DiskCache[CacheFat].PageAlignment = FAT_FATCACHE_PAGE_MIN_ALIGNMENT;\r |
462 | DiskCache[CacheData].PageAlignment = FAT_DATACACHE_PAGE_MIN_ALIGNMENT;\r | |
b9ec9330 QH |
463 | } else {\r |
464 | FatCacheGroupCount = FAT_FATCACHE_GROUP_MAX_COUNT;\r | |
c1680e88 DB |
465 | DiskCache[CacheFat].PageAlignment = FAT_FATCACHE_PAGE_MAX_ALIGNMENT;\r |
466 | DiskCache[CacheData].PageAlignment = FAT_DATACACHE_PAGE_MAX_ALIGNMENT;\r | |
b9ec9330 QH |
467 | }\r |
468 | \r | |
c1680e88 DB |
469 | DiskCache[CacheData].GroupMask = FAT_DATACACHE_GROUP_COUNT - 1;\r |
470 | DiskCache[CacheData].BaseAddress = Volume->RootPos;\r | |
471 | DiskCache[CacheData].LimitAddress = Volume->VolumeSize;\r | |
472 | DiskCache[CacheFat].GroupMask = FatCacheGroupCount - 1;\r | |
473 | DiskCache[CacheFat].BaseAddress = Volume->FatPos;\r | |
474 | DiskCache[CacheFat].LimitAddress = Volume->FatPos + Volume->FatSize;\r | |
475 | FatCacheSize = FatCacheGroupCount << DiskCache[CacheFat].PageAlignment;\r | |
476 | DataCacheSize = FAT_DATACACHE_GROUP_COUNT << DiskCache[CacheData].PageAlignment;\r | |
b9ec9330 QH |
477 | //\r |
478 | // Allocate the Fat Cache buffer\r | |
479 | //\r | |
f4500fc1 | 480 | CacheBuffer = AllocateZeroPool (FatCacheSize + DataCacheSize);\r |
b9ec9330 QH |
481 | if (CacheBuffer == NULL) {\r |
482 | return EFI_OUT_OF_RESOURCES;\r | |
483 | }\r | |
484 | \r | |
485 | Volume->CacheBuffer = CacheBuffer;\r | |
c1680e88 DB |
486 | DiskCache[CacheFat].CacheBase = CacheBuffer;\r |
487 | DiskCache[CacheData].CacheBase = CacheBuffer + FatCacheSize;\r | |
b9ec9330 QH |
488 | return EFI_SUCCESS;\r |
489 | }\r |