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511710d6 | 1 | /*++\r |
2 | \r | |
3 | Copyright (c) 2006, Intel Corporation\r | |
4 | All rights reserved. This program and the accompanying materials\r | |
5 | are licensed and made available under the terms and conditions of the BSD License\r | |
6 | which accompanies this 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 | Module Name:\r | |
13 | \r | |
14 | DiskIo.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | DiskIo driver that layers it's self on every Block IO protocol in the system.\r | |
19 | DiskIo converts a block oriented device to a byte oriented device.\r | |
20 | \r | |
21 | ReadDisk may have to do reads that are not aligned on sector boundaries.\r | |
22 | There are three cases:\r | |
23 | \r | |
24 | UnderRun - The first byte is not on a sector boundary or the read request is\r | |
25 | less than a sector in length.\r | |
26 | \r | |
27 | Aligned - A read of N contiguous sectors.\r | |
28 | \r | |
29 | OverRun - The last byte is not on a sector boundary.\r | |
30 | \r | |
31 | --*/\r | |
32 | \r | |
33 | #include "DiskIo.h"\r | |
34 | \r | |
511710d6 | 35 | EFI_DRIVER_BINDING_PROTOCOL gDiskIoDriverBinding = {\r |
36 | DiskIoDriverBindingSupported,\r | |
37 | DiskIoDriverBindingStart,\r | |
38 | DiskIoDriverBindingStop,\r | |
61fb1657 | 39 | 0xa,\r |
511710d6 | 40 | NULL,\r |
41 | NULL\r | |
42 | };\r | |
43 | \r | |
44 | DISK_IO_PRIVATE_DATA gDiskIoPrivateDataTemplate = {\r | |
45 | DISK_IO_PRIVATE_DATA_SIGNATURE,\r | |
46 | {\r | |
47 | EFI_DISK_IO_PROTOCOL_REVISION,\r | |
48 | DiskIoReadDisk,\r | |
49 | DiskIoWriteDisk\r | |
50 | },\r | |
51 | NULL\r | |
52 | };\r | |
53 | \r | |
54 | EFI_STATUS\r | |
55 | EFIAPI\r | |
56 | DiskIoDriverBindingSupported (\r | |
57 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
58 | IN EFI_HANDLE ControllerHandle,\r | |
59 | IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL\r | |
60 | )\r | |
61 | /*++\r | |
62 | \r | |
63 | Routine Description:\r | |
64 | Test to see if this driver supports ControllerHandle. Any ControllerHandle\r | |
65 | than contains a BlockIo protocol can be supported.\r | |
66 | \r | |
67 | Arguments:\r | |
68 | This - Protocol instance pointer.\r | |
69 | ControllerHandle - Handle of device to test.\r | |
70 | RemainingDevicePath - Not used.\r | |
71 | \r | |
72 | Returns:\r | |
73 | EFI_SUCCESS - This driver supports this device.\r | |
74 | EFI_ALREADY_STARTED - This driver is already running on this device.\r | |
75 | other - This driver does not support this device.\r | |
76 | \r | |
77 | --*/\r | |
78 | {\r | |
79 | EFI_STATUS Status;\r | |
80 | EFI_BLOCK_IO_PROTOCOL *BlockIo;\r | |
81 | \r | |
82 | //\r | |
83 | // Open the IO Abstraction(s) needed to perform the supported test.\r | |
84 | //\r | |
85 | Status = gBS->OpenProtocol (\r | |
86 | ControllerHandle,\r | |
87 | &gEfiBlockIoProtocolGuid,\r | |
88 | (VOID **) &BlockIo,\r | |
89 | This->DriverBindingHandle,\r | |
90 | ControllerHandle,\r | |
91 | EFI_OPEN_PROTOCOL_BY_DRIVER\r | |
92 | );\r | |
93 | if (EFI_ERROR (Status)) {\r | |
94 | return Status;\r | |
95 | }\r | |
96 | //\r | |
97 | // Close the I/O Abstraction(s) used to perform the supported test.\r | |
98 | //\r | |
99 | gBS->CloseProtocol (\r | |
100 | ControllerHandle,\r | |
101 | &gEfiBlockIoProtocolGuid,\r | |
102 | This->DriverBindingHandle,\r | |
103 | ControllerHandle\r | |
104 | );\r | |
105 | return EFI_SUCCESS;\r | |
106 | }\r | |
107 | \r | |
108 | EFI_STATUS\r | |
109 | EFIAPI\r | |
110 | DiskIoDriverBindingStart (\r | |
111 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
112 | IN EFI_HANDLE ControllerHandle,\r | |
113 | IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL\r | |
114 | )\r | |
115 | /*++\r | |
116 | \r | |
117 | Routine Description:\r | |
118 | Start this driver on ControllerHandle by opening a Block IO protocol and\r | |
119 | installing a Disk IO protocol on ControllerHandle.\r | |
120 | \r | |
121 | Arguments:\r | |
122 | This - Protocol instance pointer.\r | |
123 | ControllerHandle - Handle of device to bind driver to.\r | |
124 | RemainingDevicePath - Not used, always produce all possible children.\r | |
125 | \r | |
126 | Returns:\r | |
127 | EFI_SUCCESS - This driver is added to ControllerHandle.\r | |
128 | EFI_ALREADY_STARTED - This driver is already running on ControllerHandle.\r | |
129 | other - This driver does not support this device.\r | |
130 | \r | |
131 | --*/\r | |
132 | {\r | |
133 | EFI_STATUS Status;\r | |
134 | DISK_IO_PRIVATE_DATA *Private;\r | |
135 | \r | |
136 | Private = NULL;\r | |
137 | \r | |
138 | //\r | |
139 | // Connect to the Block IO interface on ControllerHandle.\r | |
140 | //\r | |
141 | Status = gBS->OpenProtocol (\r | |
142 | ControllerHandle,\r | |
143 | &gEfiBlockIoProtocolGuid,\r | |
144 | (VOID **) &gDiskIoPrivateDataTemplate.BlockIo,\r | |
145 | This->DriverBindingHandle,\r | |
146 | ControllerHandle,\r | |
147 | EFI_OPEN_PROTOCOL_BY_DRIVER\r | |
148 | );\r | |
149 | if (EFI_ERROR (Status)) {\r | |
150 | return Status;\r | |
151 | }\r | |
152 | //\r | |
153 | // Initialize the Disk IO device instance.\r | |
154 | //\r | |
155 | Private = AllocateCopyPool (sizeof (DISK_IO_PRIVATE_DATA), &gDiskIoPrivateDataTemplate);\r | |
156 | if (Private == NULL) {\r | |
157 | Status = EFI_OUT_OF_RESOURCES;\r | |
158 | goto ErrorExit;\r | |
159 | }\r | |
160 | //\r | |
161 | // Install protocol interfaces for the Disk IO device.\r | |
162 | //\r | |
163 | Status = gBS->InstallProtocolInterface (\r | |
164 | &ControllerHandle,\r | |
165 | &gEfiDiskIoProtocolGuid,\r | |
166 | EFI_NATIVE_INTERFACE,\r | |
167 | &Private->DiskIo\r | |
168 | );\r | |
169 | \r | |
170 | ErrorExit:\r | |
171 | if (EFI_ERROR (Status)) {\r | |
172 | \r | |
173 | if (Private != NULL) {\r | |
174 | gBS->FreePool (Private);\r | |
175 | }\r | |
176 | \r | |
177 | gBS->CloseProtocol (\r | |
178 | ControllerHandle,\r | |
179 | &gEfiBlockIoProtocolGuid,\r | |
180 | This->DriverBindingHandle,\r | |
181 | ControllerHandle\r | |
182 | );\r | |
183 | }\r | |
184 | \r | |
185 | return Status;\r | |
186 | }\r | |
187 | \r | |
188 | EFI_STATUS\r | |
189 | EFIAPI\r | |
190 | DiskIoDriverBindingStop (\r | |
191 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
192 | IN EFI_HANDLE ControllerHandle,\r | |
193 | IN UINTN NumberOfChildren,\r | |
194 | IN EFI_HANDLE *ChildHandleBuffer\r | |
195 | )\r | |
196 | /*++\r | |
197 | \r | |
198 | Routine Description:\r | |
199 | Stop this driver on ControllerHandle by removing Disk IO protocol and closing\r | |
200 | the Block IO protocol on ControllerHandle.\r | |
201 | \r | |
202 | Arguments:\r | |
203 | This - Protocol instance pointer.\r | |
204 | ControllerHandle - Handle of device to stop driver on.\r | |
205 | NumberOfChildren - Not used.\r | |
206 | ChildHandleBuffer - Not used.\r | |
207 | \r | |
208 | Returns:\r | |
209 | EFI_SUCCESS - This driver is removed ControllerHandle.\r | |
210 | other - This driver was not removed from this device.\r | |
211 | EFI_UNSUPPORTED\r | |
212 | \r | |
213 | --*/\r | |
214 | {\r | |
215 | EFI_STATUS Status;\r | |
216 | EFI_DISK_IO_PROTOCOL *DiskIo;\r | |
217 | DISK_IO_PRIVATE_DATA *Private;\r | |
218 | \r | |
219 | //\r | |
220 | // Get our context back.\r | |
221 | //\r | |
222 | Status = gBS->OpenProtocol (\r | |
223 | ControllerHandle,\r | |
224 | &gEfiDiskIoProtocolGuid,\r | |
225 | (VOID **) &DiskIo,\r | |
226 | This->DriverBindingHandle,\r | |
227 | ControllerHandle,\r | |
228 | EFI_OPEN_PROTOCOL_GET_PROTOCOL\r | |
229 | );\r | |
230 | if (EFI_ERROR (Status)) {\r | |
231 | return EFI_UNSUPPORTED;\r | |
232 | }\r | |
233 | \r | |
234 | Private = DISK_IO_PRIVATE_DATA_FROM_THIS (DiskIo);\r | |
235 | \r | |
236 | Status = gBS->UninstallProtocolInterface (\r | |
237 | ControllerHandle,\r | |
238 | &gEfiDiskIoProtocolGuid,\r | |
239 | &Private->DiskIo\r | |
240 | );\r | |
241 | if (!EFI_ERROR (Status)) {\r | |
242 | \r | |
243 | Status = gBS->CloseProtocol (\r | |
244 | ControllerHandle,\r | |
245 | &gEfiBlockIoProtocolGuid,\r | |
246 | This->DriverBindingHandle,\r | |
247 | ControllerHandle\r | |
248 | );\r | |
249 | }\r | |
250 | \r | |
251 | if (!EFI_ERROR (Status)) {\r | |
252 | gBS->FreePool (Private);\r | |
253 | }\r | |
254 | \r | |
255 | return Status;\r | |
256 | }\r | |
257 | \r | |
258 | EFI_STATUS\r | |
259 | EFIAPI\r | |
260 | DiskIoReadDisk (\r | |
261 | IN EFI_DISK_IO_PROTOCOL *This,\r | |
262 | IN UINT32 MediaId,\r | |
263 | IN UINT64 Offset,\r | |
264 | IN UINTN BufferSize,\r | |
265 | OUT VOID *Buffer\r | |
266 | )\r | |
267 | /*++\r | |
268 | \r | |
269 | Routine Description:\r | |
270 | Read BufferSize bytes from Offset into Buffer.\r | |
271 | \r | |
272 | Reads may support reads that are not aligned on\r | |
273 | sector boundaries. There are three cases:\r | |
274 | \r | |
275 | UnderRun - The first byte is not on a sector boundary or the read request is\r | |
276 | less than a sector in length.\r | |
277 | \r | |
278 | Aligned - A read of N contiguous sectors.\r | |
279 | \r | |
280 | OverRun - The last byte is not on a sector boundary.\r | |
281 | \r | |
282 | \r | |
283 | Arguments:\r | |
284 | This - Protocol instance pointer.\r | |
285 | MediaId - Id of the media, changes every time the media is replaced.\r | |
286 | Offset - The starting byte offset to read from.\r | |
287 | BufferSize - Size of Buffer.\r | |
288 | Buffer - Buffer containing read data.\r | |
289 | \r | |
290 | Returns:\r | |
291 | EFI_SUCCESS - The data was read correctly from the device.\r | |
292 | EFI_DEVICE_ERROR - The device reported an error while performing the read.\r | |
293 | EFI_NO_MEDIA - There is no media in the device.\r | |
294 | EFI_MEDIA_CHNAGED - The MediaId does not matched the current device.\r | |
295 | EFI_INVALID_PARAMETER - The read request contains device addresses that are not\r | |
296 | valid for the device.\r | |
297 | EFI_OUT_OF_RESOURCES\r | |
298 | \r | |
299 | --*/\r | |
300 | {\r | |
301 | EFI_STATUS Status;\r | |
302 | DISK_IO_PRIVATE_DATA *Private;\r | |
303 | EFI_BLOCK_IO_PROTOCOL *BlockIo;\r | |
304 | EFI_BLOCK_IO_MEDIA *Media;\r | |
305 | UINT32 BlockSize;\r | |
306 | UINT64 Lba;\r | |
307 | UINT64 OverRunLba;\r | |
308 | UINT32 UnderRun;\r | |
309 | UINT32 OverRun;\r | |
310 | BOOLEAN TransactionComplete;\r | |
311 | UINTN WorkingBufferSize;\r | |
312 | UINT8 *WorkingBuffer;\r | |
313 | UINTN Length;\r | |
314 | UINT8 *Data;\r | |
315 | UINT8 *PreData;\r | |
316 | UINTN IsBufferAligned;\r | |
317 | UINTN DataBufferSize;\r | |
318 | BOOLEAN LastRead;\r | |
319 | \r | |
320 | Private = DISK_IO_PRIVATE_DATA_FROM_THIS (This);\r | |
321 | \r | |
322 | BlockIo = Private->BlockIo;\r | |
323 | Media = BlockIo->Media;\r | |
324 | BlockSize = Media->BlockSize;\r | |
325 | \r | |
326 | if (Media->MediaId != MediaId) {\r | |
327 | return EFI_MEDIA_CHANGED;\r | |
328 | }\r | |
329 | \r | |
330 | WorkingBuffer = Buffer;\r | |
331 | WorkingBufferSize = BufferSize;\r | |
332 | \r | |
333 | //\r | |
334 | // Allocate a temporary buffer for operation\r | |
335 | //\r | |
336 | DataBufferSize = BlockSize * DATA_BUFFER_BLOCK_NUM;\r | |
337 | \r | |
338 | if (Media->IoAlign > 1) {\r | |
339 | PreData = AllocatePool (DataBufferSize + Media->IoAlign);\r | |
340 | Data = PreData - ((UINTN) PreData & (Media->IoAlign - 1)) + Media->IoAlign;\r | |
341 | } else {\r | |
342 | PreData = AllocatePool (DataBufferSize);\r | |
343 | Data = PreData;\r | |
344 | }\r | |
345 | \r | |
346 | if (PreData == NULL) {\r | |
347 | return EFI_OUT_OF_RESOURCES;\r | |
348 | }\r | |
349 | \r | |
350 | Lba = DivU64x32Remainder (Offset, BlockSize, &UnderRun);\r | |
351 | \r | |
352 | Length = BlockSize - UnderRun;\r | |
353 | TransactionComplete = FALSE;\r | |
354 | \r | |
355 | Status = EFI_SUCCESS;\r | |
356 | if (UnderRun != 0) {\r | |
357 | //\r | |
358 | // Offset starts in the middle of an Lba, so read the entire block.\r | |
359 | //\r | |
360 | Status = BlockIo->ReadBlocks (\r | |
361 | BlockIo,\r | |
362 | MediaId,\r | |
363 | Lba,\r | |
364 | BlockSize,\r | |
365 | Data\r | |
366 | );\r | |
367 | \r | |
368 | if (EFI_ERROR (Status)) {\r | |
369 | goto Done;\r | |
370 | }\r | |
371 | \r | |
372 | if (Length > BufferSize) {\r | |
373 | Length = BufferSize;\r | |
374 | TransactionComplete = TRUE;\r | |
375 | }\r | |
376 | \r | |
377 | CopyMem (WorkingBuffer, Data + UnderRun, Length);\r | |
378 | \r | |
379 | WorkingBuffer += Length;\r | |
380 | \r | |
381 | WorkingBufferSize -= Length;\r | |
382 | if (WorkingBufferSize == 0) {\r | |
383 | goto Done;\r | |
384 | }\r | |
385 | \r | |
386 | Lba += 1;\r | |
387 | }\r | |
388 | \r | |
389 | OverRunLba = Lba + DivU64x32Remainder (WorkingBufferSize, BlockSize, &OverRun);\r | |
390 | \r | |
391 | if (!TransactionComplete && WorkingBufferSize >= BlockSize) {\r | |
392 | //\r | |
393 | // If the DiskIo maps directly to a BlockIo device do the read.\r | |
394 | //\r | |
395 | if (OverRun != 0) {\r | |
396 | WorkingBufferSize -= OverRun;\r | |
397 | }\r | |
398 | //\r | |
399 | // Check buffer alignment\r | |
400 | //\r | |
401 | IsBufferAligned = (UINTN) WorkingBuffer & (UINTN) (Media->IoAlign - 1);\r | |
402 | \r | |
403 | if (Media->IoAlign <= 1 || IsBufferAligned == 0) {\r | |
404 | //\r | |
405 | // Alignment is satisfied, so read them together\r | |
406 | //\r | |
407 | Status = BlockIo->ReadBlocks (\r | |
408 | BlockIo,\r | |
409 | MediaId,\r | |
410 | Lba,\r | |
411 | WorkingBufferSize,\r | |
412 | WorkingBuffer\r | |
413 | );\r | |
414 | \r | |
415 | if (EFI_ERROR (Status)) {\r | |
416 | goto Done;\r | |
417 | }\r | |
418 | \r | |
419 | WorkingBuffer += WorkingBufferSize;\r | |
420 | \r | |
421 | } else {\r | |
422 | //\r | |
423 | // Use the allocated buffer instead of the original buffer\r | |
424 | // to avoid alignment issue.\r | |
425 | // Here, the allocated buffer (8-byte align) can satisfy the alignment\r | |
426 | //\r | |
427 | LastRead = FALSE;\r | |
428 | do {\r | |
429 | if (WorkingBufferSize <= DataBufferSize) {\r | |
430 | //\r | |
431 | // It is the last calling to readblocks in this loop\r | |
432 | //\r | |
433 | DataBufferSize = WorkingBufferSize;\r | |
434 | LastRead = TRUE;\r | |
435 | }\r | |
436 | \r | |
437 | Status = BlockIo->ReadBlocks (\r | |
438 | BlockIo,\r | |
439 | MediaId,\r | |
440 | Lba,\r | |
441 | DataBufferSize,\r | |
442 | Data\r | |
443 | );\r | |
444 | if (EFI_ERROR (Status)) {\r | |
445 | goto Done;\r | |
446 | }\r | |
447 | \r | |
448 | CopyMem (WorkingBuffer, Data, DataBufferSize);\r | |
449 | WorkingBufferSize -= DataBufferSize;\r | |
450 | WorkingBuffer += DataBufferSize;\r | |
451 | Lba += DATA_BUFFER_BLOCK_NUM;\r | |
452 | } while (!LastRead);\r | |
453 | }\r | |
454 | }\r | |
455 | \r | |
456 | if (!TransactionComplete && OverRun != 0) {\r | |
457 | //\r | |
458 | // Last read is not a complete block.\r | |
459 | //\r | |
460 | Status = BlockIo->ReadBlocks (\r | |
461 | BlockIo,\r | |
462 | MediaId,\r | |
463 | OverRunLba,\r | |
464 | BlockSize,\r | |
465 | Data\r | |
466 | );\r | |
467 | \r | |
468 | if (EFI_ERROR (Status)) {\r | |
469 | goto Done;\r | |
470 | }\r | |
471 | \r | |
472 | CopyMem (WorkingBuffer, Data, OverRun);\r | |
473 | }\r | |
474 | \r | |
475 | Done:\r | |
476 | if (PreData != NULL) {\r | |
477 | gBS->FreePool (PreData);\r | |
478 | }\r | |
479 | \r | |
480 | return Status;\r | |
481 | }\r | |
482 | \r | |
483 | EFI_STATUS\r | |
484 | EFIAPI\r | |
485 | DiskIoWriteDisk (\r | |
486 | IN EFI_DISK_IO_PROTOCOL *This,\r | |
487 | IN UINT32 MediaId,\r | |
488 | IN UINT64 Offset,\r | |
489 | IN UINTN BufferSize,\r | |
490 | IN VOID *Buffer\r | |
491 | )\r | |
492 | /*++\r | |
493 | \r | |
494 | Routine Description:\r | |
495 | Read BufferSize bytes from Offset into Buffer.\r | |
496 | \r | |
497 | Writes may require a read modify write to support writes that are not\r | |
498 | aligned on sector boundaries. There are three cases:\r | |
499 | \r | |
500 | UnderRun - The first byte is not on a sector boundary or the write request\r | |
501 | is less than a sector in length. Read modify write is required.\r | |
502 | \r | |
503 | Aligned - A write of N contiguous sectors.\r | |
504 | \r | |
505 | OverRun - The last byte is not on a sector boundary. Read modified write\r | |
506 | required.\r | |
507 | \r | |
508 | Arguments:\r | |
509 | This - Protocol instance pointer.\r | |
510 | MediaId - Id of the media, changes every time the media is replaced.\r | |
511 | Offset - The starting byte offset to read from.\r | |
512 | BufferSize - Size of Buffer.\r | |
513 | Buffer - Buffer containing read data.\r | |
514 | \r | |
515 | Returns:\r | |
516 | EFI_SUCCESS - The data was written correctly to the device.\r | |
517 | EFI_WRITE_PROTECTED - The device can not be written to.\r | |
518 | EFI_DEVICE_ERROR - The device reported an error while performing the write.\r | |
519 | EFI_NO_MEDIA - There is no media in the device.\r | |
520 | EFI_MEDIA_CHNAGED - The MediaId does not matched the current device.\r | |
521 | EFI_INVALID_PARAMETER - The write request contains device addresses that are not\r | |
522 | valid for the device.\r | |
523 | EFI_OUT_OF_RESOURCES\r | |
524 | \r | |
525 | --*/\r | |
526 | {\r | |
527 | EFI_STATUS Status;\r | |
528 | DISK_IO_PRIVATE_DATA *Private;\r | |
529 | EFI_BLOCK_IO_PROTOCOL *BlockIo;\r | |
530 | EFI_BLOCK_IO_MEDIA *Media;\r | |
531 | UINT32 BlockSize;\r | |
532 | UINT64 Lba;\r | |
533 | UINT64 OverRunLba;\r | |
534 | UINT32 UnderRun;\r | |
535 | UINT32 OverRun;\r | |
536 | BOOLEAN TransactionComplete;\r | |
537 | UINTN WorkingBufferSize;\r | |
538 | UINT8 *WorkingBuffer;\r | |
539 | UINTN Length;\r | |
540 | UINT8 *Data;\r | |
541 | UINT8 *PreData;\r | |
542 | UINTN IsBufferAligned;\r | |
543 | UINTN DataBufferSize;\r | |
544 | BOOLEAN LastWrite;\r | |
545 | \r | |
546 | Private = DISK_IO_PRIVATE_DATA_FROM_THIS (This);\r | |
547 | \r | |
548 | BlockIo = Private->BlockIo;\r | |
549 | Media = BlockIo->Media;\r | |
550 | BlockSize = Media->BlockSize;\r | |
551 | \r | |
552 | if (Media->ReadOnly) {\r | |
553 | return EFI_WRITE_PROTECTED;\r | |
554 | }\r | |
555 | \r | |
556 | if (Media->MediaId != MediaId) {\r | |
557 | return EFI_MEDIA_CHANGED;\r | |
558 | }\r | |
559 | \r | |
560 | DataBufferSize = BlockSize * DATA_BUFFER_BLOCK_NUM;\r | |
561 | \r | |
562 | if (Media->IoAlign > 1) {\r | |
563 | PreData = AllocatePool (DataBufferSize + Media->IoAlign);\r | |
564 | Data = PreData - ((UINTN) PreData & (Media->IoAlign - 1)) + Media->IoAlign;\r | |
565 | } else {\r | |
566 | PreData = AllocatePool (DataBufferSize);\r | |
567 | Data = PreData;\r | |
568 | }\r | |
569 | \r | |
570 | if (PreData == NULL) {\r | |
571 | return EFI_OUT_OF_RESOURCES;\r | |
572 | }\r | |
573 | \r | |
574 | WorkingBuffer = Buffer;\r | |
575 | WorkingBufferSize = BufferSize;\r | |
576 | \r | |
577 | Lba = DivU64x32Remainder (Offset, BlockSize, &UnderRun);\r | |
578 | \r | |
579 | Length = BlockSize - UnderRun;\r | |
580 | TransactionComplete = FALSE;\r | |
581 | \r | |
582 | Status = EFI_SUCCESS;\r | |
583 | if (UnderRun != 0) {\r | |
584 | //\r | |
585 | // Offset starts in the middle of an Lba, so do read modify write.\r | |
586 | //\r | |
587 | Status = BlockIo->ReadBlocks (\r | |
588 | BlockIo,\r | |
589 | MediaId,\r | |
590 | Lba,\r | |
591 | BlockSize,\r | |
592 | Data\r | |
593 | );\r | |
594 | \r | |
595 | if (EFI_ERROR (Status)) {\r | |
596 | goto Done;\r | |
597 | }\r | |
598 | \r | |
599 | if (Length > BufferSize) {\r | |
600 | Length = BufferSize;\r | |
601 | TransactionComplete = TRUE;\r | |
602 | }\r | |
603 | \r | |
604 | CopyMem (Data + UnderRun, WorkingBuffer, Length);\r | |
605 | \r | |
606 | Status = BlockIo->WriteBlocks (\r | |
607 | BlockIo,\r | |
608 | MediaId,\r | |
609 | Lba,\r | |
610 | BlockSize,\r | |
611 | Data\r | |
612 | );\r | |
613 | if (EFI_ERROR (Status)) {\r | |
614 | goto Done;\r | |
615 | }\r | |
616 | \r | |
617 | WorkingBuffer += Length;\r | |
618 | WorkingBufferSize -= Length;\r | |
619 | if (WorkingBufferSize == 0) {\r | |
620 | goto Done;\r | |
621 | }\r | |
622 | \r | |
623 | Lba += 1;\r | |
624 | }\r | |
625 | \r | |
626 | OverRunLba = Lba + DivU64x32Remainder (WorkingBufferSize, BlockSize, &OverRun);\r | |
627 | \r | |
628 | if (!TransactionComplete && WorkingBufferSize >= BlockSize) {\r | |
629 | //\r | |
630 | // If the DiskIo maps directly to a BlockIo device do the write.\r | |
631 | //\r | |
632 | if (OverRun != 0) {\r | |
633 | WorkingBufferSize -= OverRun;\r | |
634 | }\r | |
635 | //\r | |
636 | // Check buffer alignment\r | |
637 | //\r | |
638 | IsBufferAligned = (UINTN) WorkingBuffer & (UINTN) (Media->IoAlign - 1);\r | |
639 | \r | |
640 | if (Media->IoAlign <= 1 || IsBufferAligned == 0) {\r | |
641 | //\r | |
642 | // Alignment is satisfied, so write them together\r | |
643 | //\r | |
644 | Status = BlockIo->WriteBlocks (\r | |
645 | BlockIo,\r | |
646 | MediaId,\r | |
647 | Lba,\r | |
648 | WorkingBufferSize,\r | |
649 | WorkingBuffer\r | |
650 | );\r | |
651 | \r | |
652 | if (EFI_ERROR (Status)) {\r | |
653 | goto Done;\r | |
654 | }\r | |
655 | \r | |
656 | WorkingBuffer += WorkingBufferSize;\r | |
657 | \r | |
658 | } else {\r | |
659 | //\r | |
660 | // The buffer parameter is not aligned with the request\r | |
661 | // So use the allocated instead.\r | |
662 | // It can fit almost all the cases.\r | |
663 | //\r | |
664 | LastWrite = FALSE;\r | |
665 | do {\r | |
666 | if (WorkingBufferSize <= DataBufferSize) {\r | |
667 | //\r | |
668 | // It is the last calling to writeblocks in this loop\r | |
669 | //\r | |
670 | DataBufferSize = WorkingBufferSize;\r | |
671 | LastWrite = TRUE;\r | |
672 | }\r | |
673 | \r | |
674 | CopyMem (Data, WorkingBuffer, DataBufferSize);\r | |
675 | Status = BlockIo->WriteBlocks (\r | |
676 | BlockIo,\r | |
677 | MediaId,\r | |
678 | Lba,\r | |
679 | DataBufferSize,\r | |
680 | Data\r | |
681 | );\r | |
682 | if (EFI_ERROR (Status)) {\r | |
683 | goto Done;\r | |
684 | }\r | |
685 | \r | |
686 | WorkingBufferSize -= DataBufferSize;\r | |
687 | WorkingBuffer += DataBufferSize;\r | |
688 | Lba += DATA_BUFFER_BLOCK_NUM;\r | |
689 | } while (!LastWrite);\r | |
690 | }\r | |
691 | }\r | |
692 | \r | |
693 | if (!TransactionComplete && OverRun != 0) {\r | |
694 | //\r | |
695 | // Last bit is not a complete block, so do a read modify write.\r | |
696 | //\r | |
697 | Status = BlockIo->ReadBlocks (\r | |
698 | BlockIo,\r | |
699 | MediaId,\r | |
700 | OverRunLba,\r | |
701 | BlockSize,\r | |
702 | Data\r | |
703 | );\r | |
704 | \r | |
705 | if (EFI_ERROR (Status)) {\r | |
706 | goto Done;\r | |
707 | }\r | |
708 | \r | |
709 | CopyMem (Data, WorkingBuffer, OverRun);\r | |
710 | \r | |
711 | Status = BlockIo->WriteBlocks (\r | |
712 | BlockIo,\r | |
713 | MediaId,\r | |
714 | OverRunLba,\r | |
715 | BlockSize,\r | |
716 | Data\r | |
717 | );\r | |
718 | if (EFI_ERROR (Status)) {\r | |
719 | goto Done;\r | |
720 | }\r | |
721 | }\r | |
722 | \r | |
723 | Done:\r | |
724 | if (PreData != NULL) {\r | |
725 | gBS->FreePool (PreData);\r | |
726 | }\r | |
727 | \r | |
728 | return Status;\r | |
729 | }\r |