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ad86a50a | 1 | /** @file\r |
2 | This file implements ATA pass through transaction for ATA bus driver.\r | |
3 | \r | |
4 | This file implements the low level execution of ATA pass through transaction.\r | |
5 | It transforms the high level identity, read/write, reset command to ATA pass\r | |
6 | through command and protocol. \r | |
7 | \r | |
6ea8e37b | 8 | Copyright (c) 2009 - 2010 Intel Corporation. <BR>\r |
ad86a50a | 9 | All rights reserved. This program and the accompanying materials\r |
10 | are licensed and made available under the terms and conditions of the BSD License\r | |
11 | which accompanies this distribution. The full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
13 | \r | |
14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
15 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
16 | \r | |
17 | \r | |
18 | **/\r | |
19 | \r | |
20 | #include "AtaBus.h"\r | |
21 | \r | |
22 | //\r | |
23 | // Look up table (UdmaValid, IsWrite) for EFI_ATA_PASS_THRU_CMD_PROTOCOL\r | |
24 | //\r | |
25 | EFI_ATA_PASS_THRU_CMD_PROTOCOL mAtaPassThruCmdProtocols[][2] = {\r | |
26 | {\r | |
27 | EFI_ATA_PASS_THRU_PROTOCOL_PIO_DATA_IN,\r | |
28 | EFI_ATA_PASS_THRU_PROTOCOL_PIO_DATA_OUT\r | |
29 | },\r | |
30 | {\r | |
31 | EFI_ATA_PASS_THRU_PROTOCOL_UDMA_DATA_IN,\r | |
32 | EFI_ATA_PASS_THRU_PROTOCOL_UDMA_DATA_OUT,\r | |
33 | }\r | |
34 | };\r | |
35 | \r | |
36 | //\r | |
37 | // Look up table (UdmaValid, Lba48Bit, IsIsWrite) for ATA_CMD\r | |
38 | //\r | |
39 | UINT8 mAtaCommands[][2][2] = {\r | |
40 | {\r | |
41 | {\r | |
42 | ATA_CMD_READ_SECTORS, // 28-bit LBA; PIO read\r | |
43 | ATA_CMD_WRITE_SECTORS // 28-bit LBA; PIO write\r | |
44 | },\r | |
45 | {\r | |
46 | ATA_CMD_READ_SECTORS_EXT, // 48-bit LBA; PIO read\r | |
47 | ATA_CMD_WRITE_SECTORS_EXT // 48-bit LBA; PIO write\r | |
48 | }\r | |
49 | },\r | |
50 | {\r | |
51 | {\r | |
52 | ATA_CMD_READ_DMA, // 28-bit LBA; DMA read\r | |
53 | ATA_CMD_WRITE_DMA // 28-bit LBA; DMA write\r | |
54 | },\r | |
55 | {\r | |
56 | ATA_CMD_READ_DMA_EXT, // 48-bit LBA; DMA read\r | |
57 | ATA_CMD_WRITE_DMA_EXT // 48-bit LBA; DMA write\r | |
58 | }\r | |
59 | }\r | |
60 | };\r | |
61 | \r | |
62 | //\r | |
63 | // Look up table (Lba48Bit) for maximum transfer block number\r | |
64 | //\r | |
65 | UINTN mMaxTransferBlockNumber[] = {\r | |
66 | MAX_28BIT_TRANSFER_BLOCK_NUM,\r | |
67 | MAX_48BIT_TRANSFER_BLOCK_NUM\r | |
68 | };\r | |
69 | \r | |
70 | \r | |
71 | /**\r | |
72 | Wrapper for EFI_ATA_PASS_THRU_PROTOCOL.PassThru().\r | |
73 | \r | |
74 | This function wraps the PassThru() invocation for ATA pass through function\r | |
75 | for an ATA device. It assembles the ATA pass through command packet for ATA\r | |
76 | transaction.\r | |
77 | \r | |
78 | @param AtaDevice The ATA child device involved for the operation.\r | |
79 | \r | |
80 | @return The return status from EFI_ATA_PASS_THRU_PROTOCOL.PassThru().\r | |
81 | \r | |
82 | **/\r | |
83 | EFI_STATUS\r | |
84 | AtaDevicePassThru (\r | |
85 | IN OUT ATA_DEVICE *AtaDevice\r | |
86 | )\r | |
87 | {\r | |
88 | EFI_STATUS Status;\r | |
89 | EFI_ATA_PASS_THRU_PROTOCOL *AtaPassThru;\r | |
90 | EFI_ATA_PASS_THRU_COMMAND_PACKET *Packet;\r | |
91 | \r | |
92 | //\r | |
93 | // Assemble packet\r | |
94 | //\r | |
95 | Packet = &AtaDevice->Packet;\r | |
96 | Packet->Asb = AtaDevice->Asb;\r | |
97 | Packet->Acb = &AtaDevice->Acb;\r | |
98 | Packet->Timeout = ATA_TIMEOUT;\r | |
99 | \r | |
100 | AtaPassThru = AtaDevice->AtaBusDriverData->AtaPassThru;\r | |
101 | \r | |
102 | Status = AtaPassThru->PassThru (\r | |
103 | AtaPassThru,\r | |
104 | AtaDevice->Port,\r | |
105 | AtaDevice->PortMultiplierPort,\r | |
106 | Packet,\r | |
107 | NULL\r | |
108 | );\r | |
109 | //\r | |
110 | // Ensure ATA pass through caller and callee have the same\r | |
111 | // interpretation of ATA pass through protocol. \r | |
112 | //\r | |
113 | ASSERT (Status != EFI_INVALID_PARAMETER);\r | |
114 | ASSERT (Status != EFI_BAD_BUFFER_SIZE);\r | |
115 | \r | |
116 | return Status;\r | |
117 | }\r | |
118 | \r | |
119 | \r | |
120 | /**\r | |
121 | Wrapper for EFI_ATA_PASS_THRU_PROTOCOL.ResetDevice().\r | |
122 | \r | |
123 | This function wraps the ResetDevice() invocation for ATA pass through function\r | |
124 | for an ATA device. \r | |
125 | \r | |
126 | @param AtaDevice The ATA child device involved for the operation.\r | |
127 | \r | |
128 | @return The return status from EFI_ATA_PASS_THRU_PROTOCOL.PassThru().\r | |
129 | \r | |
130 | **/\r | |
131 | EFI_STATUS\r | |
132 | ResetAtaDevice (\r | |
133 | IN ATA_DEVICE *AtaDevice\r | |
134 | )\r | |
135 | {\r | |
136 | EFI_ATA_PASS_THRU_PROTOCOL *AtaPassThru;\r | |
137 | \r | |
138 | AtaPassThru = AtaDevice->AtaBusDriverData->AtaPassThru;\r | |
139 | \r | |
140 | return AtaPassThru->ResetDevice (\r | |
141 | AtaPassThru,\r | |
142 | AtaDevice->Port,\r | |
143 | AtaDevice->PortMultiplierPort\r | |
144 | );\r | |
145 | }\r | |
146 | \r | |
147 | \r | |
148 | /**\r | |
149 | Prints ATA model name to ATA device structure.\r | |
150 | \r | |
151 | This function converts ATA device model name from ATA identify data \r | |
152 | to a string in ATA device structure. It needs to change the character\r | |
153 | order in the original model name string.\r | |
154 | \r | |
155 | @param AtaDevice The ATA child device involved for the operation.\r | |
156 | \r | |
157 | **/\r | |
158 | VOID\r | |
159 | PrintAtaModelName (\r | |
160 | IN OUT ATA_DEVICE *AtaDevice\r | |
161 | )\r | |
162 | {\r | |
163 | UINTN Index;\r | |
164 | CHAR8 *Source;\r | |
165 | CHAR16 *Destination;\r | |
166 | \r | |
6ea8e37b | 167 | Source = AtaDevice->IdentifyData->ModelName;\r |
ad86a50a | 168 | Destination = AtaDevice->ModelName;\r |
169 | \r | |
170 | //\r | |
171 | // Swap the byte order in the original module name.\r | |
172 | //\r | |
173 | for (Index = 0; Index < MAX_MODEL_NAME_LEN; Index += 2) {\r | |
174 | Destination[Index] = Source[Index + 1];\r | |
175 | Destination[Index + 1] = Source[Index];\r | |
176 | }\r | |
177 | AtaDevice->ModelName[MAX_MODEL_NAME_LEN] = L'\0';\r | |
178 | }\r | |
179 | \r | |
180 | \r | |
181 | /**\r | |
182 | Gets ATA device Capacity according to ATA 6.\r | |
183 | \r | |
184 | This function returns the capacity of the ATA device if it follows\r | |
185 | ATA 6 to support 48 bit addressing.\r | |
186 | \r | |
187 | @param AtaDevice The ATA child device involved for the operation.\r | |
188 | \r | |
189 | @return The capacity of the ATA device or 0 if the device does not support\r | |
190 | 48-bit addressing defined in ATA 6.\r | |
191 | \r | |
192 | **/\r | |
193 | EFI_LBA\r | |
194 | GetAtapi6Capacity (\r | |
195 | IN ATA_DEVICE *AtaDevice\r | |
196 | )\r | |
197 | {\r | |
198 | EFI_LBA Capacity;\r | |
199 | EFI_LBA TmpLba;\r | |
200 | UINTN Index;\r | |
6ea8e37b | 201 | ATA_IDENTIFY_DATA *IdentifyData;\r |
ad86a50a | 202 | \r |
6ea8e37b | 203 | IdentifyData = AtaDevice->IdentifyData;\r |
204 | if ((IdentifyData->command_set_supported_83 & BIT10) == 0) {\r | |
ad86a50a | 205 | //\r |
206 | // The device doesn't support 48 bit addressing\r | |
207 | //\r | |
208 | return 0;\r | |
209 | }\r | |
210 | \r | |
211 | //\r | |
212 | // 48 bit address feature set is supported, get maximum capacity\r | |
213 | //\r | |
214 | Capacity = 0;\r | |
215 | for (Index = 0; Index < 4; Index++) {\r | |
216 | //\r | |
217 | // Lower byte goes first: word[100] is the lowest word, word[103] is highest\r | |
218 | //\r | |
6ea8e37b | 219 | TmpLba = IdentifyData->maximum_lba_for_48bit_addressing[Index];\r |
ad86a50a | 220 | Capacity |= LShiftU64 (TmpLba, 16 * Index);\r |
221 | }\r | |
222 | \r | |
223 | return Capacity;\r | |
224 | }\r | |
225 | \r | |
226 | \r | |
227 | /**\r | |
228 | Identifies ATA device via the Identify data.\r | |
229 | \r | |
230 | This function identifies the ATA device and initializes the Media information in \r | |
231 | Block IO protocol interface.\r | |
232 | \r | |
233 | @param AtaDevice The ATA child device involved for the operation.\r | |
234 | \r | |
235 | @retval EFI_UNSUPPORTED The device is not a valid ATA device (hard disk).\r | |
236 | @retval EFI_SUCCESS The device is successfully identified and Media information\r | |
237 | is correctly initialized.\r | |
238 | \r | |
239 | **/\r | |
240 | EFI_STATUS\r | |
241 | IdentifyAtaDevice (\r | |
242 | IN OUT ATA_DEVICE *AtaDevice\r | |
243 | )\r | |
244 | {\r | |
6ea8e37b | 245 | ATA_IDENTIFY_DATA *IdentifyData;\r |
ad86a50a | 246 | EFI_BLOCK_IO_MEDIA *BlockMedia;\r |
247 | EFI_LBA Capacity;\r | |
248 | UINT16 PhyLogicSectorSupport;\r | |
249 | UINT16 UdmaMode;\r | |
250 | \r | |
6ea8e37b | 251 | IdentifyData = AtaDevice->IdentifyData;\r |
ad86a50a | 252 | \r |
253 | if ((IdentifyData->config & BIT15) != 0) {\r | |
254 | //\r | |
255 | // This is not an hard disk\r | |
256 | //\r | |
257 | return EFI_UNSUPPORTED;\r | |
258 | }\r | |
259 | \r | |
260 | //\r | |
261 | // Check whether the WORD 88 (supported UltraDMA by drive) is valid\r | |
262 | //\r | |
263 | if ((IdentifyData->field_validity & BIT2) != 0) {\r | |
264 | UdmaMode = IdentifyData->ultra_dma_mode;\r | |
265 | if ((UdmaMode & (BIT0 | BIT1 | BIT2 | BIT3 | BIT4 | BIT5 | BIT6)) != 0) {\r | |
266 | //\r | |
267 | // If BIT0~BIT6 is selected, then UDMA is supported\r | |
268 | //\r | |
269 | AtaDevice->UdmaValid = TRUE;\r | |
270 | }\r | |
271 | }\r | |
272 | \r | |
273 | Capacity = GetAtapi6Capacity (AtaDevice);\r | |
274 | if (Capacity > MAX_28BIT_ADDRESSING_CAPACITY) {\r | |
275 | //\r | |
276 | // Capacity exceeds 120GB. 48-bit addressing is really needed\r | |
277 | //\r | |
278 | AtaDevice->Lba48Bit = TRUE;\r | |
279 | } else {\r | |
280 | //\r | |
281 | // This is a hard disk <= 120GB capacity, treat it as normal hard disk\r | |
282 | //\r | |
283 | Capacity = ((UINT32)IdentifyData->user_addressable_sectors_hi << 16) | IdentifyData->user_addressable_sectors_lo;\r | |
284 | AtaDevice->Lba48Bit = FALSE;\r | |
285 | }\r | |
286 | \r | |
287 | //\r | |
288 | // Block Media Information:\r | |
289 | //\r | |
290 | BlockMedia = &AtaDevice->BlockMedia;\r | |
291 | BlockMedia->LastBlock = Capacity - 1;\r | |
907c1a00 | 292 | BlockMedia->IoAlign = AtaDevice->AtaBusDriverData->AtaPassThru->Mode->IoAlign;\r |
ad86a50a | 293 | //\r |
294 | // Check whether Long Physical Sector Feature is supported\r | |
295 | //\r | |
296 | PhyLogicSectorSupport = IdentifyData->phy_logic_sector_support;\r | |
297 | if ((PhyLogicSectorSupport & (BIT14 | BIT15)) == BIT14) {\r | |
298 | //\r | |
299 | // Check whether one physical block contains multiple physical blocks\r | |
300 | //\r | |
301 | if ((PhyLogicSectorSupport & BIT13) != 0) {\r | |
302 | BlockMedia->LogicalBlocksPerPhysicalBlock = (UINT32) (1 << (PhyLogicSectorSupport & 0x000f));\r | |
303 | //\r | |
304 | // Check lowest alignment of logical blocks within physical block\r | |
305 | //\r | |
306 | if ((IdentifyData->alignment_logic_in_phy_blocks & (BIT14 | BIT15)) == BIT14) {\r | |
fa03149c | 307 | BlockMedia->LowestAlignedLba = (EFI_LBA) (BlockMedia->LogicalBlocksPerPhysicalBlock - (IdentifyData->alignment_logic_in_phy_blocks & 0x3fff)) %\r |
308 | BlockMedia->LogicalBlocksPerPhysicalBlock;\r | |
ad86a50a | 309 | }\r |
310 | }\r | |
311 | //\r | |
312 | // Check logical block size\r | |
313 | //\r | |
314 | if ((PhyLogicSectorSupport & BIT12) != 0) {\r | |
315 | BlockMedia->BlockSize = (UINT32) (((IdentifyData->logic_sector_size_hi << 16) | IdentifyData->logic_sector_size_lo) * sizeof (UINT16));\r | |
316 | }\r | |
317 | AtaDevice->BlockIo.Revision = EFI_BLOCK_IO_PROTOCOL_REVISION2;\r | |
318 | }\r | |
319 | //\r | |
320 | // Get ATA model name from identify data structure. \r | |
321 | //\r | |
322 | PrintAtaModelName (AtaDevice); \r | |
323 | \r | |
324 | return EFI_SUCCESS;\r | |
325 | }\r | |
326 | \r | |
327 | \r | |
328 | /**\r | |
329 | Discovers whether it is a valid ATA device.\r | |
330 | \r | |
331 | This function issues ATA_CMD_IDENTIFY_DRIVE command to the ATA device to identify it.\r | |
332 | If the command is executed successfully, it then identifies it and initializes\r | |
333 | the Media information in Block IO protocol interface.\r | |
334 | \r | |
335 | @param AtaDevice The ATA child device involved for the operation.\r | |
336 | \r | |
337 | @retval EFI_SUCCESS The device is successfully identified and Media information\r | |
338 | is correctly initialized.\r | |
339 | @return others Some error occurs when discovering the ATA device. \r | |
340 | \r | |
341 | **/\r | |
342 | EFI_STATUS\r | |
343 | DiscoverAtaDevice (\r | |
344 | IN OUT ATA_DEVICE *AtaDevice\r | |
345 | )\r | |
346 | {\r | |
347 | EFI_STATUS Status;\r | |
348 | EFI_ATA_COMMAND_BLOCK *Acb;\r | |
349 | EFI_ATA_PASS_THRU_COMMAND_PACKET *Packet;\r | |
350 | UINTN Retry;\r | |
351 | \r | |
352 | //\r | |
353 | // Prepare for ATA command block.\r | |
354 | //\r | |
355 | Acb = ZeroMem (&AtaDevice->Acb, sizeof (*Acb));\r | |
356 | Acb->AtaCommand = ATA_CMD_IDENTIFY_DRIVE;\r | |
357 | \r | |
358 | //\r | |
359 | // Prepare for ATA pass through packet.\r | |
360 | //\r | |
361 | Packet = ZeroMem (&AtaDevice->Packet, sizeof (*Packet));\r | |
362 | Packet->InDataBuffer = AtaDevice->IdentifyData;\r | |
363 | Packet->InTransferLength = sizeof (*AtaDevice->IdentifyData);\r | |
364 | Packet->Protocol = EFI_ATA_PASS_THRU_PROTOCOL_PIO_DATA_IN;\r | |
365 | Packet->Length = EFI_ATA_PASS_THRU_LENGTH_BYTES | EFI_ATA_PASS_THRU_LENGTH_SECTOR_COUNT;\r | |
366 | \r | |
367 | Retry = MAX_RETRY_TIMES;\r | |
368 | do {\r | |
369 | Status = AtaDevicePassThru (AtaDevice);\r | |
370 | if (!EFI_ERROR (Status)) {\r | |
371 | //\r | |
372 | // The command is issued successfully\r | |
373 | //\r | |
374 | Status = IdentifyAtaDevice (AtaDevice);\r | |
375 | if (!EFI_ERROR (Status)) {\r | |
376 | return Status;\r | |
377 | }\r | |
378 | }\r | |
379 | } while (Retry-- > 0);\r | |
380 | \r | |
381 | return Status;\r | |
382 | }\r | |
383 | \r | |
384 | /**\r | |
385 | Transfer data from ATA device.\r | |
386 | \r | |
387 | This function performs one ATA pass through transaction to transfer data from/to\r | |
388 | ATA device. It chooses the appropriate ATA command and protocol to invoke PassThru\r | |
389 | interface of ATA pass through.\r | |
390 | \r | |
391 | @param AtaDevice The ATA child device involved for the operation.\r | |
392 | @param Buffer The pointer to the current transaction buffer.\r | |
393 | @param StartLba The starting logical block address to be accessed.\r | |
394 | @param TransferLength The block number or sector count of the transfer.\r | |
395 | @param IsWrite Indicates whether it is a write operation.\r | |
396 | \r | |
397 | @retval EFI_SUCCESS The data transfer is complete successfully.\r | |
398 | @return others Some error occurs when transferring data. \r | |
399 | \r | |
400 | **/\r | |
401 | EFI_STATUS\r | |
402 | TransferAtaDevice (\r | |
403 | IN OUT ATA_DEVICE *AtaDevice,\r | |
404 | IN OUT VOID *Buffer,\r | |
405 | IN EFI_LBA StartLba,\r | |
406 | IN UINT32 TransferLength,\r | |
407 | IN BOOLEAN IsWrite\r | |
408 | )\r | |
409 | {\r | |
410 | EFI_ATA_COMMAND_BLOCK *Acb;\r | |
411 | EFI_ATA_PASS_THRU_COMMAND_PACKET *Packet;\r | |
412 | \r | |
423401f9 | 413 | //\r |
61d4f8f9 | 414 | // Ensure AtaDevice->UdmaValid, AtaDevice->Lba48Bit and IsWrite are valid boolean values \r |
423401f9 | 415 | //\r |
61d4f8f9 | 416 | ASSERT ((UINTN) AtaDevice->UdmaValid < 2);\r |
423401f9 | 417 | ASSERT ((UINTN) AtaDevice->Lba48Bit < 2);\r |
418 | ASSERT ((UINTN) IsWrite < 2);\r | |
ad86a50a | 419 | //\r |
420 | // Prepare for ATA command block.\r | |
421 | //\r | |
422 | Acb = ZeroMem (&AtaDevice->Acb, sizeof (*Acb));\r | |
423 | Acb->AtaCommand = mAtaCommands[AtaDevice->UdmaValid][AtaDevice->Lba48Bit][IsWrite];\r | |
424 | Acb->AtaSectorNumber = (UINT8) StartLba;\r | |
425 | Acb->AtaCylinderLow = (UINT8) RShiftU64 (StartLba, 8);\r | |
426 | Acb->AtaCylinderHigh = (UINT8) RShiftU64 (StartLba, 16);\r | |
427 | Acb->AtaDeviceHead = (UINT8) (BIT7 | BIT6 | BIT5 | (AtaDevice->PortMultiplierPort << 4)); \r | |
423401f9 | 428 | Acb->AtaSectorCount = (UINT8) TransferLength;\r |
ad86a50a | 429 | if (AtaDevice->Lba48Bit) {\r |
430 | Acb->AtaSectorNumberExp = (UINT8) RShiftU64 (StartLba, 24);\r | |
423401f9 | 431 | Acb->AtaCylinderLowExp = (UINT8) RShiftU64 (StartLba, 32);\r |
432 | Acb->AtaCylinderHighExp = (UINT8) RShiftU64 (StartLba, 40);\r | |
433 | Acb->AtaSectorCountExp = (UINT8) (TransferLength >> 8);\r | |
ad86a50a | 434 | } else {\r |
435 | Acb->AtaDeviceHead = (UINT8) (Acb->AtaDeviceHead | RShiftU64 (StartLba, 24));\r | |
436 | }\r | |
ad86a50a | 437 | \r |
438 | //\r | |
439 | // Prepare for ATA pass through packet.\r | |
440 | //\r | |
441 | Packet = ZeroMem (&AtaDevice->Packet, sizeof (*Packet));\r | |
442 | if (IsWrite) {\r | |
443 | Packet->OutDataBuffer = Buffer;\r | |
444 | Packet->OutTransferLength = TransferLength;\r | |
445 | } else {\r | |
446 | Packet->InDataBuffer = Buffer;\r | |
447 | Packet->InTransferLength = TransferLength;\r | |
448 | }\r | |
449 | Packet->Protocol = mAtaPassThruCmdProtocols[AtaDevice->UdmaValid][IsWrite];\r | |
450 | Packet->Length = EFI_ATA_PASS_THRU_LENGTH_SECTOR_COUNT;\r | |
451 | \r | |
452 | return AtaDevicePassThru (AtaDevice); \r | |
453 | }\r | |
454 | \r | |
455 | /**\r | |
456 | Read or write a number of blocks from ATA device.\r | |
457 | \r | |
458 | This function performs ATA pass through transactions to read/write data from/to\r | |
459 | ATA device. It may separate the read/write request into several ATA pass through\r | |
460 | transactions.\r | |
461 | \r | |
462 | @param AtaDevice The ATA child device involved for the operation.\r | |
463 | @param Buffer The pointer to the current transaction buffer.\r | |
464 | @param StartLba The starting logical block address to be accessed.\r | |
465 | @param NumberOfBlocks The block number or sector count of the transfer.\r | |
466 | @param IsWrite Indicates whether it is a write operation.\r | |
467 | \r | |
468 | @retval EFI_SUCCESS The data transfer is complete successfully.\r | |
469 | @return others Some error occurs when transferring data. \r | |
470 | \r | |
471 | **/\r | |
472 | EFI_STATUS \r | |
473 | AccessAtaDevice(\r | |
474 | IN OUT ATA_DEVICE *AtaDevice,\r | |
475 | IN OUT UINT8 *Buffer,\r | |
476 | IN EFI_LBA StartLba,\r | |
477 | IN UINTN NumberOfBlocks,\r | |
478 | IN BOOLEAN IsWrite\r | |
479 | )\r | |
480 | {\r | |
481 | EFI_STATUS Status;\r | |
482 | UINTN MaxTransferBlockNumber;\r | |
483 | UINTN TransferBlockNumber;\r | |
484 | UINTN BlockSize;\r | |
485 | \r | |
423401f9 | 486 | //\r |
487 | // Ensure AtaDevice->Lba48Bit is a valid boolean value \r | |
488 | //\r | |
489 | ASSERT ((UINTN) AtaDevice->Lba48Bit < 2);\r | |
ad86a50a | 490 | MaxTransferBlockNumber = mMaxTransferBlockNumber[AtaDevice->Lba48Bit];\r |
491 | BlockSize = AtaDevice->BlockMedia.BlockSize;\r | |
492 | do {\r | |
493 | if (NumberOfBlocks > MaxTransferBlockNumber) {\r | |
494 | TransferBlockNumber = MaxTransferBlockNumber;\r | |
495 | NumberOfBlocks -= MaxTransferBlockNumber;\r | |
496 | } else {\r | |
497 | TransferBlockNumber = NumberOfBlocks;\r | |
498 | NumberOfBlocks = 0;\r | |
499 | }\r | |
500 | \r | |
501 | Status = TransferAtaDevice (AtaDevice, Buffer, StartLba, (UINT32) TransferBlockNumber, IsWrite);\r | |
502 | if (EFI_ERROR (Status)) {\r | |
503 | return Status;\r | |
504 | }\r | |
505 | StartLba += TransferBlockNumber;\r | |
506 | Buffer += TransferBlockNumber * BlockSize;\r | |
507 | } while (NumberOfBlocks > 0);\r | |
508 | \r | |
509 | return Status;\r | |
510 | }\r |