]>
Commit | Line | Data |
---|---|---|
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 |
6163cc98 | 5 | This program and the accompanying materials are licensed and made available\r |
b9ec9330 QH |
6 | under the terms and conditions of the BSD License which accompanies this\r |
7 | distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
cae7420b | 13 | **/\r |
b9ec9330 | 14 | \r |
cae7420b | 15 | #include "Fat.h"\r |
b9ec9330 | 16 | \r |
cae7420b | 17 | /**\r |
b9ec9330 | 18 | \r |
cae7420b | 19 | This function is used by the Data Cache.\r |
b9ec9330 | 20 | \r |
cae7420b DB |
21 | When this function is called by write command, all entries in this range\r |
22 | are older than the contents in disk, so they are invalid; just mark them invalid.\r | |
b9ec9330 | 23 | \r |
cae7420b DB |
24 | When this function is called by read command, if any entry in this range\r |
25 | is dirty, it means that the relative info directly readed from media is older than\r | |
26 | than the info in the cache; So need to update the relative info in the Buffer.\r | |
b9ec9330 | 27 | \r |
cae7420b DB |
28 | @param Volume - FAT file system volume.\r |
29 | @param IoMode - This function is called by read command or write command\r | |
30 | @param StartPageNo - First PageNo to be checked in the cache.\r | |
31 | @param EndPageNo - Last PageNo to be checked in the cache.\r | |
32 | @param Buffer - The user buffer need to update. Only when doing the read command\r | |
33 | and there is dirty cache in the cache range, this parameter will be used.\r | |
b9ec9330 | 34 | \r |
cae7420b | 35 | **/\r |
b9ec9330 QH |
36 | STATIC\r |
37 | VOID\r | |
38 | FatFlushDataCacheRange (\r | |
39 | IN FAT_VOLUME *Volume,\r | |
40 | IN IO_MODE IoMode,\r | |
41 | IN UINTN StartPageNo,\r | |
42 | IN UINTN EndPageNo,\r | |
43 | OUT UINT8 *Buffer\r | |
44 | )\r | |
b9ec9330 QH |
45 | {\r |
46 | UINTN PageNo;\r | |
47 | UINTN GroupNo;\r | |
48 | UINTN GroupMask;\r | |
49 | UINTN PageSize;\r | |
50 | UINT8 PageAlignment;\r | |
51 | DISK_CACHE *DiskCache;\r | |
52 | CACHE_TAG *CacheTag;\r | |
53 | UINT8 *BaseAddress;\r | |
54 | \r | |
c1680e88 | 55 | DiskCache = &Volume->DiskCache[CacheData];\r |
b9ec9330 QH |
56 | BaseAddress = DiskCache->CacheBase;\r |
57 | GroupMask = DiskCache->GroupMask;\r | |
58 | PageAlignment = DiskCache->PageAlignment;\r | |
59 | PageSize = (UINTN)1 << PageAlignment;\r | |
60 | \r | |
61 | for (PageNo = StartPageNo; PageNo < EndPageNo; PageNo++) {\r | |
62 | GroupNo = PageNo & GroupMask;\r | |
63 | CacheTag = &DiskCache->CacheTag[GroupNo];\r | |
64 | if (CacheTag->RealSize > 0 && CacheTag->PageNo == PageNo) {\r | |
65 | //\r | |
66 | // When reading data form disk directly, if some dirty data\r | |
67 | // in cache is in this rang, this data in the Buffer need to\r | |
68 | // be updated with the cache's dirty data.\r | |
69 | //\r | |
c1680e88 | 70 | if (IoMode == ReadDisk) {\r |
b9ec9330 QH |
71 | if (CacheTag->Dirty) {\r |
72 | CopyMem (\r | |
73 | Buffer + ((PageNo - StartPageNo) << PageAlignment),\r | |
74 | BaseAddress + (GroupNo << PageAlignment),\r | |
75 | PageSize\r | |
76 | );\r | |
77 | }\r | |
78 | } else {\r | |
79 | //\r | |
80 | // Make all valid entries in this range invalid.\r | |
81 | //\r | |
82 | CacheTag->RealSize = 0;\r | |
83 | }\r | |
84 | }\r | |
85 | }\r | |
86 | }\r | |
87 | \r | |
cae7420b DB |
88 | /**\r |
89 | \r | |
90 | Exchange the cache page with the image on the disk\r | |
91 | \r | |
92 | @param Volume - FAT file system volume.\r | |
93 | @param DataType - Indicate the cache type.\r | |
94 | @param IoMode - Indicate whether to load this page from disk or store this page to disk.\r | |
95 | @param CacheTag - The Cache Tag for the current cache page.\r | |
96 | @param Task point to task instance.\r | |
97 | \r | |
98 | @retval EFI_SUCCESS - Cache page exchanged successfully.\r | |
99 | @return Others - An error occurred when exchanging cache page.\r | |
100 | \r | |
101 | **/\r | |
b9ec9330 QH |
102 | STATIC\r |
103 | EFI_STATUS\r | |
104 | FatExchangeCachePage (\r | |
105 | IN FAT_VOLUME *Volume,\r | |
106 | IN CACHE_DATA_TYPE DataType,\r | |
107 | IN IO_MODE IoMode,\r | |
149d6335 RN |
108 | IN CACHE_TAG *CacheTag,\r |
109 | IN FAT_TASK *Task\r | |
b9ec9330 | 110 | )\r |
b9ec9330 QH |
111 | {\r |
112 | EFI_STATUS Status;\r | |
113 | UINTN GroupNo;\r | |
114 | UINTN PageNo;\r | |
115 | UINTN WriteCount;\r | |
116 | UINTN RealSize;\r | |
117 | UINT64 EntryPos;\r | |
118 | UINT64 MaxSize;\r | |
119 | DISK_CACHE *DiskCache;\r | |
120 | VOID *PageAddress;\r | |
121 | UINT8 PageAlignment;\r | |
122 | \r | |
123 | DiskCache = &Volume->DiskCache[DataType];\r | |
124 | PageNo = CacheTag->PageNo;\r | |
125 | GroupNo = PageNo & DiskCache->GroupMask;\r | |
126 | PageAlignment = DiskCache->PageAlignment;\r | |
127 | PageAddress = DiskCache->CacheBase + (GroupNo << PageAlignment);\r | |
128 | EntryPos = DiskCache->BaseAddress + LShiftU64 (PageNo, PageAlignment);\r | |
129 | RealSize = CacheTag->RealSize;\r | |
c1680e88 | 130 | if (IoMode == ReadDisk) {\r |
b9ec9330 QH |
131 | RealSize = (UINTN)1 << PageAlignment;\r |
132 | MaxSize = DiskCache->LimitAddress - EntryPos;\r | |
133 | if (MaxSize < RealSize) {\r | |
134 | DEBUG ((EFI_D_INFO, "FatDiskIo: Cache Page OutBound occurred! \n"));\r | |
135 | RealSize = (UINTN) MaxSize;\r | |
136 | }\r | |
137 | }\r | |
138 | \r | |
139 | WriteCount = 1;\r | |
c1680e88 | 140 | if (DataType == CacheFat && IoMode == WriteDisk) {\r |
b9ec9330 QH |
141 | WriteCount = Volume->NumFats;\r |
142 | }\r | |
143 | \r | |
144 | do {\r | |
145 | //\r | |
146 | // Only fat table writing will execute more than once\r | |
147 | //\r | |
149d6335 | 148 | Status = FatDiskIo (Volume, IoMode, EntryPos, RealSize, PageAddress, Task);\r |
b9ec9330 QH |
149 | if (EFI_ERROR (Status)) {\r |
150 | return Status;\r | |
151 | }\r | |
152 | \r | |
153 | EntryPos += Volume->FatSize;\r | |
154 | } while (--WriteCount > 0);\r | |
155 | \r | |
156 | CacheTag->Dirty = FALSE;\r | |
157 | CacheTag->RealSize = RealSize;\r | |
158 | return EFI_SUCCESS;\r | |
159 | }\r | |
160 | \r | |
cae7420b DB |
161 | /**\r |
162 | \r | |
163 | Get one cache page by specified PageNo.\r | |
164 | \r | |
165 | @param Volume - FAT file system volume.\r | |
166 | @param CacheDataType - The cache type: CACHE_FAT or CACHE_DATA.\r | |
167 | @param PageNo - PageNo to match with the cache.\r | |
168 | @param CacheTag - The Cache Tag for the current cache page.\r | |
169 | \r | |
170 | @retval EFI_SUCCESS - Get the cache page successfully.\r | |
171 | @return other - An error occurred when accessing data.\r | |
172 | \r | |
173 | **/\r | |
b9ec9330 QH |
174 | STATIC\r |
175 | EFI_STATUS\r | |
176 | FatGetCachePage (\r | |
177 | IN FAT_VOLUME *Volume,\r | |
178 | IN CACHE_DATA_TYPE CacheDataType,\r | |
179 | IN UINTN PageNo,\r | |
180 | IN CACHE_TAG *CacheTag\r | |
181 | )\r | |
b9ec9330 QH |
182 | {\r |
183 | EFI_STATUS Status;\r | |
184 | UINTN OldPageNo;\r | |
185 | \r | |
186 | OldPageNo = CacheTag->PageNo;\r | |
187 | if (CacheTag->RealSize > 0 && OldPageNo == PageNo) {\r | |
188 | //\r | |
189 | // Cache Hit occurred\r | |
190 | //\r | |
191 | return EFI_SUCCESS;\r | |
192 | }\r | |
193 | \r | |
194 | //\r | |
195 | // Write dirty cache page back to disk\r | |
196 | //\r | |
197 | if (CacheTag->RealSize > 0 && CacheTag->Dirty) {\r | |
c1680e88 | 198 | Status = FatExchangeCachePage (Volume, CacheDataType, WriteDisk, CacheTag, NULL);\r |
b9ec9330 QH |
199 | if (EFI_ERROR (Status)) {\r |
200 | return Status;\r | |
201 | }\r | |
202 | }\r | |
203 | //\r | |
204 | // Load new data from disk;\r | |
205 | //\r | |
206 | CacheTag->PageNo = PageNo;\r | |
c1680e88 | 207 | Status = FatExchangeCachePage (Volume, CacheDataType, ReadDisk, CacheTag, NULL);\r |
b9ec9330 QH |
208 | \r |
209 | return Status;\r | |
210 | }\r | |
211 | \r | |
cae7420b DB |
212 | /**\r |
213 | \r | |
214 | Read Length bytes from the position of Offset into Buffer, or\r | |
215 | write Length bytes from Buffer into the position of Offset.\r | |
216 | \r | |
217 | @param Volume - FAT file system volume.\r | |
218 | @param CacheDataType - The type of cache: CACHE_DATA or CACHE_FAT.\r | |
219 | @param IoMode - Indicate the type of disk access.\r | |
220 | @param PageNo - The number of unaligned cache page.\r | |
221 | @param Offset - The starting byte of cache page.\r | |
222 | @param Length - The number of bytes that is read or written\r | |
223 | @param Buffer - Buffer containing cache data.\r | |
224 | \r | |
225 | @retval EFI_SUCCESS - The data was accessed correctly.\r | |
226 | @return Others - An error occurred when accessing unaligned cache page.\r | |
227 | \r | |
228 | **/\r | |
b9ec9330 QH |
229 | STATIC\r |
230 | EFI_STATUS\r | |
231 | FatAccessUnalignedCachePage (\r | |
232 | IN FAT_VOLUME *Volume,\r | |
233 | IN CACHE_DATA_TYPE CacheDataType,\r | |
234 | IN IO_MODE IoMode,\r | |
235 | IN UINTN PageNo,\r | |
236 | IN UINTN Offset,\r | |
237 | IN UINTN Length,\r | |
238 | IN OUT VOID *Buffer\r | |
239 | )\r | |
b9ec9330 QH |
240 | {\r |
241 | EFI_STATUS Status;\r | |
242 | VOID *Source;\r | |
243 | VOID *Destination;\r | |
244 | DISK_CACHE *DiskCache;\r | |
245 | CACHE_TAG *CacheTag;\r | |
246 | UINTN GroupNo;\r | |
247 | \r | |
248 | DiskCache = &Volume->DiskCache[CacheDataType];\r | |
249 | GroupNo = PageNo & DiskCache->GroupMask;\r | |
250 | CacheTag = &DiskCache->CacheTag[GroupNo];\r | |
251 | Status = FatGetCachePage (Volume, CacheDataType, PageNo, CacheTag);\r | |
252 | if (!EFI_ERROR (Status)) {\r | |
253 | Source = DiskCache->CacheBase + (GroupNo << DiskCache->PageAlignment) + Offset;\r | |
254 | Destination = Buffer;\r | |
c1680e88 | 255 | if (IoMode != ReadDisk) {\r |
b9ec9330 QH |
256 | CacheTag->Dirty = TRUE;\r |
257 | DiskCache->Dirty = TRUE;\r | |
258 | Destination = Source;\r | |
259 | Source = Buffer;\r | |
260 | }\r | |
261 | \r | |
262 | CopyMem (Destination, Source, Length);\r | |
263 | }\r | |
264 | \r | |
265 | return Status;\r | |
266 | }\r | |
267 | \r | |
cae7420b | 268 | /**\r |
b9ec9330 QH |
269 | \r |
270 | Read BufferSize bytes from the position of Offset into Buffer,\r | |
271 | or write BufferSize bytes from Buffer into the position of Offset.\r | |
272 | \r | |
273 | Base on the parameter of CACHE_DATA_TYPE, the data access will be divided into\r | |
274 | the access of FAT cache (CACHE_FAT) and the access of Data cache (CACHE_DATA):\r | |
275 | \r | |
276 | 1. Access of FAT cache (CACHE_FAT): Access the data in the FAT cache, if there is cache\r | |
277 | page hit, just return the cache page; else update the related cache page and return\r | |
278 | the right cache page.\r | |
279 | 2. Access of Data cache (CACHE_DATA):\r | |
280 | The access data will be divided into UnderRun data, Aligned data and OverRun data;\r | |
281 | The UnderRun data and OverRun data will be accessed by the Data cache,\r | |
282 | but the Aligned data will be accessed with disk directly.\r | |
283 | \r | |
cae7420b DB |
284 | @param Volume - FAT file system volume.\r |
285 | @param CacheDataType - The type of cache: CACHE_DATA or CACHE_FAT.\r | |
286 | @param IoMode - Indicate the type of disk access.\r | |
287 | @param Offset - The starting byte offset to read from.\r | |
288 | @param BufferSize - Size of Buffer.\r | |
289 | @param Buffer - Buffer containing cache data.\r | |
290 | @param Task point to task instance.\r | |
b9ec9330 | 291 | \r |
cae7420b DB |
292 | @retval EFI_SUCCESS - The data was accessed correctly.\r |
293 | @retval EFI_MEDIA_CHANGED - The MediaId does not match the current device.\r | |
294 | @return Others - An error occurred when accessing cache.\r | |
b9ec9330 | 295 | \r |
cae7420b DB |
296 | **/\r |
297 | EFI_STATUS\r | |
298 | FatAccessCache (\r | |
299 | IN FAT_VOLUME *Volume,\r | |
300 | IN CACHE_DATA_TYPE CacheDataType,\r | |
301 | IN IO_MODE IoMode,\r | |
302 | IN UINT64 Offset,\r | |
303 | IN UINTN BufferSize,\r | |
304 | IN OUT UINT8 *Buffer,\r | |
305 | IN FAT_TASK *Task\r | |
306 | )\r | |
b9ec9330 QH |
307 | {\r |
308 | EFI_STATUS Status;\r | |
309 | UINTN PageSize;\r | |
310 | UINTN UnderRun;\r | |
311 | UINTN OverRun;\r | |
312 | UINTN AlignedSize;\r | |
313 | UINTN Length;\r | |
314 | UINTN PageNo;\r | |
315 | UINTN AlignedPageCount;\r | |
316 | UINTN OverRunPageNo;\r | |
317 | DISK_CACHE *DiskCache;\r | |
318 | UINT64 EntryPos;\r | |
319 | UINT8 PageAlignment;\r | |
320 | \r | |
321 | ASSERT (Volume->CacheBuffer != NULL);\r | |
322 | \r | |
323 | Status = EFI_SUCCESS;\r | |
324 | DiskCache = &Volume->DiskCache[CacheDataType];\r | |
325 | EntryPos = Offset - DiskCache->BaseAddress;\r | |
326 | PageAlignment = DiskCache->PageAlignment;\r | |
327 | PageSize = (UINTN)1 << PageAlignment;\r | |
328 | PageNo = (UINTN) RShiftU64 (EntryPos, PageAlignment);\r | |
329 | UnderRun = ((UINTN) EntryPos) & (PageSize - 1);\r | |
330 | \r | |
331 | if (UnderRun > 0) {\r | |
332 | Length = PageSize - UnderRun;\r | |
333 | if (Length > BufferSize) {\r | |
334 | Length = BufferSize;\r | |
335 | }\r | |
336 | \r | |
337 | Status = FatAccessUnalignedCachePage (Volume, CacheDataType, IoMode, PageNo, UnderRun, Length, Buffer);\r | |
338 | if (EFI_ERROR (Status)) {\r | |
339 | return Status;\r | |
340 | }\r | |
341 | \r | |
342 | Buffer += Length;\r | |
343 | BufferSize -= Length;\r | |
344 | PageNo++;\r | |
345 | }\r | |
346 | \r | |
347 | AlignedPageCount = BufferSize >> PageAlignment;\r | |
348 | OverRunPageNo = PageNo + AlignedPageCount;\r | |
349 | //\r | |
350 | // The access of the Aligned data\r | |
351 | //\r | |
352 | if (AlignedPageCount > 0) {\r | |
353 | //\r | |
354 | // Accessing fat table cannot have alignment data\r | |
355 | //\r | |
c1680e88 | 356 | ASSERT (CacheDataType == CacheData);\r |
b9ec9330 QH |
357 | \r |
358 | EntryPos = Volume->RootPos + LShiftU64 (PageNo, PageAlignment);\r | |
359 | AlignedSize = AlignedPageCount << PageAlignment;\r | |
149d6335 | 360 | Status = FatDiskIo (Volume, IoMode, EntryPos, AlignedSize, Buffer, Task);\r |
b9ec9330 QH |
361 | if (EFI_ERROR (Status)) {\r |
362 | return Status;\r | |
363 | }\r | |
364 | //\r | |
365 | // If these access data over laps the relative cache range, these cache pages need\r | |
366 | // to be updated.\r | |
367 | //\r | |
368 | FatFlushDataCacheRange (Volume, IoMode, PageNo, OverRunPageNo, Buffer);\r | |
369 | Buffer += AlignedSize;\r | |
370 | BufferSize -= AlignedSize;\r | |
371 | }\r | |
372 | //\r | |
373 | // The access of the OverRun data\r | |
374 | //\r | |
375 | OverRun = BufferSize;\r | |
376 | if (OverRun > 0) {\r | |
377 | //\r | |
378 | // Last read is not a complete page\r | |
379 | //\r | |
380 | Status = FatAccessUnalignedCachePage (Volume, CacheDataType, IoMode, OverRunPageNo, 0, OverRun, Buffer);\r | |
381 | }\r | |
382 | \r | |
383 | return Status;\r | |
384 | }\r | |
385 | \r | |
cae7420b | 386 | /**\r |
b9ec9330 QH |
387 | \r |
388 | Flush all the dirty cache back, include the FAT cache and the Data cache.\r | |
389 | \r | |
cae7420b DB |
390 | @param Volume - FAT file system volume.\r |
391 | @param Task point to task instance.\r | |
b9ec9330 | 392 | \r |
cae7420b DB |
393 | @retval EFI_SUCCESS - Flush all the dirty cache back successfully\r |
394 | @return other - An error occurred when writing the data into the disk\r | |
b9ec9330 | 395 | \r |
cae7420b DB |
396 | **/\r |
397 | EFI_STATUS\r | |
398 | FatVolumeFlushCache (\r | |
399 | IN FAT_VOLUME *Volume,\r | |
400 | IN FAT_TASK *Task\r | |
401 | )\r | |
b9ec9330 QH |
402 | {\r |
403 | EFI_STATUS Status;\r | |
404 | CACHE_DATA_TYPE CacheDataType;\r | |
405 | UINTN GroupIndex;\r | |
406 | UINTN GroupMask;\r | |
407 | DISK_CACHE *DiskCache;\r | |
408 | CACHE_TAG *CacheTag;\r | |
409 | \r | |
c1680e88 | 410 | for (CacheDataType = (CACHE_DATA_TYPE) 0; CacheDataType < CacheMaxType; CacheDataType++) {\r |
b9ec9330 QH |
411 | DiskCache = &Volume->DiskCache[CacheDataType];\r |
412 | if (DiskCache->Dirty) {\r | |
413 | //\r | |
414 | // Data cache or fat cache is dirty, write the dirty data back\r | |
415 | //\r | |
416 | GroupMask = DiskCache->GroupMask;\r | |
417 | for (GroupIndex = 0; GroupIndex <= GroupMask; GroupIndex++) {\r | |
418 | CacheTag = &DiskCache->CacheTag[GroupIndex];\r | |
419 | if (CacheTag->RealSize > 0 && CacheTag->Dirty) {\r | |
420 | //\r | |
421 | // Write back all Dirty Data Cache Page to disk\r | |
422 | //\r | |
c1680e88 | 423 | Status = FatExchangeCachePage (Volume, CacheDataType, WriteDisk, CacheTag, Task);\r |
b9ec9330 QH |
424 | if (EFI_ERROR (Status)) {\r |
425 | return Status;\r | |
426 | }\r | |
427 | }\r | |
428 | }\r | |
429 | \r | |
430 | DiskCache->Dirty = FALSE;\r | |
431 | }\r | |
432 | }\r | |
433 | //\r | |
434 | // Flush the block device.\r | |
435 | //\r | |
436 | Status = Volume->BlockIo->FlushBlocks (Volume->BlockIo);\r | |
437 | return Status;\r | |
438 | }\r | |
439 | \r | |
cae7420b | 440 | /**\r |
b9ec9330 QH |
441 | \r |
442 | Initialize the disk cache according to Volume's FatType.\r | |
443 | \r | |
cae7420b | 444 | @param Volume - FAT file system volume.\r |
b9ec9330 | 445 | \r |
cae7420b DB |
446 | @retval EFI_SUCCESS - The disk cache is successfully initialized.\r |
447 | @retval EFI_OUT_OF_RESOURCES - Not enough memory to allocate disk cache.\r | |
b9ec9330 | 448 | \r |
cae7420b DB |
449 | **/\r |
450 | EFI_STATUS\r | |
451 | FatInitializeDiskCache (\r | |
452 | IN FAT_VOLUME *Volume\r | |
453 | )\r | |
b9ec9330 QH |
454 | {\r |
455 | DISK_CACHE *DiskCache;\r | |
456 | UINTN FatCacheGroupCount;\r | |
457 | UINTN DataCacheSize;\r | |
458 | UINTN FatCacheSize;\r | |
459 | UINT8 *CacheBuffer;\r | |
460 | \r | |
461 | DiskCache = Volume->DiskCache;\r | |
462 | //\r | |
463 | // Configure the parameters of disk cache\r | |
464 | //\r | |
c1680e88 | 465 | if (Volume->FatType == Fat12) {\r |
b9ec9330 | 466 | FatCacheGroupCount = FAT_FATCACHE_GROUP_MIN_COUNT;\r |
c1680e88 DB |
467 | DiskCache[CacheFat].PageAlignment = FAT_FATCACHE_PAGE_MIN_ALIGNMENT;\r |
468 | DiskCache[CacheData].PageAlignment = FAT_DATACACHE_PAGE_MIN_ALIGNMENT;\r | |
b9ec9330 QH |
469 | } else {\r |
470 | FatCacheGroupCount = FAT_FATCACHE_GROUP_MAX_COUNT;\r | |
c1680e88 DB |
471 | DiskCache[CacheFat].PageAlignment = FAT_FATCACHE_PAGE_MAX_ALIGNMENT;\r |
472 | DiskCache[CacheData].PageAlignment = FAT_DATACACHE_PAGE_MAX_ALIGNMENT;\r | |
b9ec9330 QH |
473 | }\r |
474 | \r | |
c1680e88 DB |
475 | DiskCache[CacheData].GroupMask = FAT_DATACACHE_GROUP_COUNT - 1;\r |
476 | DiskCache[CacheData].BaseAddress = Volume->RootPos;\r | |
477 | DiskCache[CacheData].LimitAddress = Volume->VolumeSize;\r | |
478 | DiskCache[CacheFat].GroupMask = FatCacheGroupCount - 1;\r | |
479 | DiskCache[CacheFat].BaseAddress = Volume->FatPos;\r | |
480 | DiskCache[CacheFat].LimitAddress = Volume->FatPos + Volume->FatSize;\r | |
481 | FatCacheSize = FatCacheGroupCount << DiskCache[CacheFat].PageAlignment;\r | |
482 | DataCacheSize = FAT_DATACACHE_GROUP_COUNT << DiskCache[CacheData].PageAlignment;\r | |
b9ec9330 QH |
483 | //\r |
484 | // Allocate the Fat Cache buffer\r | |
485 | //\r | |
f4500fc1 | 486 | CacheBuffer = AllocateZeroPool (FatCacheSize + DataCacheSize);\r |
b9ec9330 QH |
487 | if (CacheBuffer == NULL) {\r |
488 | return EFI_OUT_OF_RESOURCES;\r | |
489 | }\r | |
490 | \r | |
491 | Volume->CacheBuffer = CacheBuffer;\r | |
c1680e88 DB |
492 | DiskCache[CacheFat].CacheBase = CacheBuffer;\r |
493 | DiskCache[CacheData].CacheBase = CacheBuffer + FatCacheSize;\r | |
b9ec9330 QH |
494 | return EFI_SUCCESS;\r |
495 | }\r |