1 /*
2 * This header file contains public constants and structures used by
3 * the scsi code for linux.
4 *
5 * For documentation on the OPCODES, MESSAGES, and SENSE values,
6 * please consult the SCSI standard.
7 */
8 #ifndef _SCSI_SCSI_H
9 #define _SCSI_SCSI_H
10
11 #include <linux/types.h>
12 #include <linux/scatterlist.h>
13
14 struct scsi_cmnd;
15
16 /*
17 * The maximum number of SG segments that we will put inside a
18 * scatterlist (unless chaining is used). Should ideally fit inside a
19 * single page, to avoid a higher order allocation. We could define this
20 * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
21 * minimum value is 32
22 */
23 #define SCSI_MAX_SG_SEGMENTS 128
24
25 /*
26 * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
27 * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
28 */
29 #ifdef ARCH_HAS_SG_CHAIN
30 #define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
31 #else
32 #define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
33 #endif
34
35 /*
36 * DIX-capable adapters effectively support infinite chaining for the
37 * protection information scatterlist
38 */
39 #define SCSI_MAX_PROT_SG_SEGMENTS 0xFFFF
40
41 /*
42 * Special value for scanning to specify scanning or rescanning of all
43 * possible channels, (target) ids, or luns on a given shost.
44 */
45 #define SCAN_WILD_CARD ~0
46
47 /*
48 * SCSI opcodes
49 */
50
51 #define TEST_UNIT_READY 0x00
52 #define REZERO_UNIT 0x01
53 #define REQUEST_SENSE 0x03
54 #define FORMAT_UNIT 0x04
55 #define READ_BLOCK_LIMITS 0x05
56 #define REASSIGN_BLOCKS 0x07
57 #define INITIALIZE_ELEMENT_STATUS 0x07
58 #define READ_6 0x08
59 #define WRITE_6 0x0a
60 #define SEEK_6 0x0b
61 #define READ_REVERSE 0x0f
62 #define WRITE_FILEMARKS 0x10
63 #define SPACE 0x11
64 #define INQUIRY 0x12
65 #define RECOVER_BUFFERED_DATA 0x14
66 #define MODE_SELECT 0x15
67 #define RESERVE 0x16
68 #define RELEASE 0x17
69 #define COPY 0x18
70 #define ERASE 0x19
71 #define MODE_SENSE 0x1a
72 #define START_STOP 0x1b
73 #define RECEIVE_DIAGNOSTIC 0x1c
74 #define SEND_DIAGNOSTIC 0x1d
75 #define ALLOW_MEDIUM_REMOVAL 0x1e
76
77 #define READ_FORMAT_CAPACITIES 0x23
78 #define SET_WINDOW 0x24
79 #define READ_CAPACITY 0x25
80 #define READ_10 0x28
81 #define WRITE_10 0x2a
82 #define SEEK_10 0x2b
83 #define POSITION_TO_ELEMENT 0x2b
84 #define WRITE_VERIFY 0x2e
85 #define VERIFY 0x2f
86 #define SEARCH_HIGH 0x30
87 #define SEARCH_EQUAL 0x31
88 #define SEARCH_LOW 0x32
89 #define SET_LIMITS 0x33
90 #define PRE_FETCH 0x34
91 #define READ_POSITION 0x34
92 #define SYNCHRONIZE_CACHE 0x35
93 #define LOCK_UNLOCK_CACHE 0x36
94 #define READ_DEFECT_DATA 0x37
95 #define MEDIUM_SCAN 0x38
96 #define COMPARE 0x39
97 #define COPY_VERIFY 0x3a
98 #define WRITE_BUFFER 0x3b
99 #define READ_BUFFER 0x3c
100 #define UPDATE_BLOCK 0x3d
101 #define READ_LONG 0x3e
102 #define WRITE_LONG 0x3f
103 #define CHANGE_DEFINITION 0x40
104 #define WRITE_SAME 0x41
105 #define UNMAP 0x42
106 #define READ_TOC 0x43
107 #define READ_HEADER 0x44
108 #define GET_EVENT_STATUS_NOTIFICATION 0x4a
109 #define LOG_SELECT 0x4c
110 #define LOG_SENSE 0x4d
111 #define XDWRITEREAD_10 0x53
112 #define MODE_SELECT_10 0x55
113 #define RESERVE_10 0x56
114 #define RELEASE_10 0x57
115 #define MODE_SENSE_10 0x5a
116 #define PERSISTENT_RESERVE_IN 0x5e
117 #define PERSISTENT_RESERVE_OUT 0x5f
118 #define VARIABLE_LENGTH_CMD 0x7f
119 #define REPORT_LUNS 0xa0
120 #define SECURITY_PROTOCOL_IN 0xa2
121 #define MAINTENANCE_IN 0xa3
122 #define MAINTENANCE_OUT 0xa4
123 #define MOVE_MEDIUM 0xa5
124 #define EXCHANGE_MEDIUM 0xa6
125 #define READ_12 0xa8
126 #define WRITE_12 0xaa
127 #define READ_MEDIA_SERIAL_NUMBER 0xab
128 #define WRITE_VERIFY_12 0xae
129 #define VERIFY_12 0xaf
130 #define SEARCH_HIGH_12 0xb0
131 #define SEARCH_EQUAL_12 0xb1
132 #define SEARCH_LOW_12 0xb2
133 #define SECURITY_PROTOCOL_OUT 0xb5
134 #define READ_ELEMENT_STATUS 0xb8
135 #define SEND_VOLUME_TAG 0xb6
136 #define WRITE_LONG_2 0xea
137 #define EXTENDED_COPY 0x83
138 #define RECEIVE_COPY_RESULTS 0x84
139 #define ACCESS_CONTROL_IN 0x86
140 #define ACCESS_CONTROL_OUT 0x87
141 #define READ_16 0x88
142 #define WRITE_16 0x8a
143 #define READ_ATTRIBUTE 0x8c
144 #define WRITE_ATTRIBUTE 0x8d
145 #define VERIFY_16 0x8f
146 #define WRITE_SAME_16 0x93
147 #define SERVICE_ACTION_IN 0x9e
148 /* values for service action in */
149 #define SAI_READ_CAPACITY_16 0x10
150 #define SAI_GET_LBA_STATUS 0x12
151 /* values for VARIABLE_LENGTH_CMD service action codes
152 * see spc4r17 Section D.3.5, table D.7 and D.8 */
153 #define VLC_SA_RECEIVE_CREDENTIAL 0x1800
154 /* values for maintenance in */
155 #define MI_REPORT_IDENTIFYING_INFORMATION 0x05
156 #define MI_REPORT_TARGET_PGS 0x0a
157 #define MI_REPORT_ALIASES 0x0b
158 #define MI_REPORT_SUPPORTED_OPERATION_CODES 0x0c
159 #define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS 0x0d
160 #define MI_REPORT_PRIORITY 0x0e
161 #define MI_REPORT_TIMESTAMP 0x0f
162 #define MI_MANAGEMENT_PROTOCOL_IN 0x10
163 /* values for maintenance out */
164 #define MO_SET_IDENTIFYING_INFORMATION 0x06
165 #define MO_SET_TARGET_PGS 0x0a
166 #define MO_CHANGE_ALIASES 0x0b
167 #define MO_SET_PRIORITY 0x0e
168 #define MO_SET_TIMESTAMP 0x0f
169 #define MO_MANAGEMENT_PROTOCOL_OUT 0x10
170 /* values for variable length command */
171 #define XDREAD_32 0x03
172 #define XDWRITE_32 0x04
173 #define XPWRITE_32 0x06
174 #define XDWRITEREAD_32 0x07
175 #define READ_32 0x09
176 #define VERIFY_32 0x0a
177 #define WRITE_32 0x0b
178 #define WRITE_SAME_32 0x0d
179
180 /* Values for T10/04-262r7 */
181 #define ATA_16 0x85 /* 16-byte pass-thru */
182 #define ATA_12 0xa1 /* 12-byte pass-thru */
183
184 /*
185 * SCSI command lengths
186 */
187
188 #define SCSI_MAX_VARLEN_CDB_SIZE 260
189
190 /* defined in T10 SCSI Primary Commands-2 (SPC2) */
191 struct scsi_varlen_cdb_hdr {
192 __u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
193 __u8 control;
194 __u8 misc[5];
195 __u8 additional_cdb_length; /* total cdb length - 8 */
196 __be16 service_action;
197 /* service specific data follows */
198 };
199
200 static inline unsigned
scsi_varlen_cdb_length(const void * hdr)201 scsi_varlen_cdb_length(const void *hdr)
202 {
203 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
204 }
205
206 extern const unsigned char scsi_command_size_tbl[8];
207 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
208
209 static inline unsigned
scsi_command_size(const unsigned char * cmnd)210 scsi_command_size(const unsigned char *cmnd)
211 {
212 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
213 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
214 }
215
216 /*
217 * SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
218 * T10/1561-D Revision 4 Draft dated 7th November 2002.
219 */
220 #define SAM_STAT_GOOD 0x00
221 #define SAM_STAT_CHECK_CONDITION 0x02
222 #define SAM_STAT_CONDITION_MET 0x04
223 #define SAM_STAT_BUSY 0x08
224 #define SAM_STAT_INTERMEDIATE 0x10
225 #define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
226 #define SAM_STAT_RESERVATION_CONFLICT 0x18
227 #define SAM_STAT_COMMAND_TERMINATED 0x22 /* obsolete in SAM-3 */
228 #define SAM_STAT_TASK_SET_FULL 0x28
229 #define SAM_STAT_ACA_ACTIVE 0x30
230 #define SAM_STAT_TASK_ABORTED 0x40
231
232 /** scsi_status_is_good - check the status return.
233 *
234 * @status: the status passed up from the driver (including host and
235 * driver components)
236 *
237 * This returns true for known good conditions that may be treated as
238 * command completed normally
239 */
scsi_status_is_good(int status)240 static inline int scsi_status_is_good(int status)
241 {
242 /*
243 * FIXME: bit0 is listed as reserved in SCSI-2, but is
244 * significant in SCSI-3. For now, we follow the SCSI-2
245 * behaviour and ignore reserved bits.
246 */
247 status &= 0xfe;
248 return ((status == SAM_STAT_GOOD) ||
249 (status == SAM_STAT_INTERMEDIATE) ||
250 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
251 /* FIXME: this is obsolete in SAM-3 */
252 (status == SAM_STAT_COMMAND_TERMINATED));
253 }
254
255 /*
256 * Status codes. These are deprecated as they are shifted 1 bit right
257 * from those found in the SCSI standards. This causes confusion for
258 * applications that are ported to several OSes. Prefer SAM Status codes
259 * above.
260 */
261
262 #define GOOD 0x00
263 #define CHECK_CONDITION 0x01
264 #define CONDITION_GOOD 0x02
265 #define BUSY 0x04
266 #define INTERMEDIATE_GOOD 0x08
267 #define INTERMEDIATE_C_GOOD 0x0a
268 #define RESERVATION_CONFLICT 0x0c
269 #define COMMAND_TERMINATED 0x11
270 #define QUEUE_FULL 0x14
271 #define ACA_ACTIVE 0x18
272 #define TASK_ABORTED 0x20
273
274 #define STATUS_MASK 0xfe
275
276 /*
277 * SENSE KEYS
278 */
279
280 #define NO_SENSE 0x00
281 #define RECOVERED_ERROR 0x01
282 #define NOT_READY 0x02
283 #define MEDIUM_ERROR 0x03
284 #define HARDWARE_ERROR 0x04
285 #define ILLEGAL_REQUEST 0x05
286 #define UNIT_ATTENTION 0x06
287 #define DATA_PROTECT 0x07
288 #define BLANK_CHECK 0x08
289 #define COPY_ABORTED 0x0a
290 #define ABORTED_COMMAND 0x0b
291 #define VOLUME_OVERFLOW 0x0d
292 #define MISCOMPARE 0x0e
293
294
295 /*
296 * DEVICE TYPES
297 * Please keep them in 0x%02x format for $MODALIAS to work
298 */
299
300 #define TYPE_DISK 0x00
301 #define TYPE_TAPE 0x01
302 #define TYPE_PRINTER 0x02
303 #define TYPE_PROCESSOR 0x03 /* HP scanners use this */
304 #define TYPE_WORM 0x04 /* Treated as ROM by our system */
305 #define TYPE_ROM 0x05
306 #define TYPE_SCANNER 0x06
307 #define TYPE_MOD 0x07 /* Magneto-optical disk -
308 * - treated as TYPE_DISK */
309 #define TYPE_MEDIUM_CHANGER 0x08
310 #define TYPE_COMM 0x09 /* Communications device */
311 #define TYPE_RAID 0x0c
312 #define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
313 #define TYPE_RBC 0x0e
314 #define TYPE_OSD 0x11
315 #define TYPE_NO_LUN 0x7f
316
317 /* SCSI protocols; these are taken from SPC-3 section 7.5 */
318 enum scsi_protocol {
319 SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
320 SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
321 SCSI_PROTOCOL_SSA = 2, /* Serial Storage Architecture - Obsolete */
322 SCSI_PROTOCOL_SBP = 3, /* firewire */
323 SCSI_PROTOCOL_SRP = 4, /* Infiniband RDMA */
324 SCSI_PROTOCOL_ISCSI = 5,
325 SCSI_PROTOCOL_SAS = 6,
326 SCSI_PROTOCOL_ADT = 7, /* Media Changers */
327 SCSI_PROTOCOL_ATA = 8,
328 SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
329 };
330
331 /* Returns a human-readable name for the device */
332 extern const char * scsi_device_type(unsigned type);
333
334 /*
335 * standard mode-select header prepended to all mode-select commands
336 */
337
338 struct ccs_modesel_head {
339 __u8 _r1; /* reserved */
340 __u8 medium; /* device-specific medium type */
341 __u8 _r2; /* reserved */
342 __u8 block_desc_length; /* block descriptor length */
343 __u8 density; /* device-specific density code */
344 __u8 number_blocks_hi; /* number of blocks in this block desc */
345 __u8 number_blocks_med;
346 __u8 number_blocks_lo;
347 __u8 _r3;
348 __u8 block_length_hi; /* block length for blocks in this desc */
349 __u8 block_length_med;
350 __u8 block_length_lo;
351 };
352
353 /*
354 * ScsiLun: 8 byte LUN.
355 */
356 struct scsi_lun {
357 __u8 scsi_lun[8];
358 };
359
360 /*
361 * The Well Known LUNS (SAM-3) in our int representation of a LUN
362 */
363 #define SCSI_W_LUN_BASE 0xc100
364 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
365 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
366 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
367
scsi_is_wlun(unsigned int lun)368 static inline int scsi_is_wlun(unsigned int lun)
369 {
370 return (lun & 0xff00) == SCSI_W_LUN_BASE;
371 }
372
373
374 /*
375 * MESSAGE CODES
376 */
377
378 #define COMMAND_COMPLETE 0x00
379 #define EXTENDED_MESSAGE 0x01
380 #define EXTENDED_MODIFY_DATA_POINTER 0x00
381 #define EXTENDED_SDTR 0x01
382 #define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
383 #define EXTENDED_WDTR 0x03
384 #define EXTENDED_PPR 0x04
385 #define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
386 #define SAVE_POINTERS 0x02
387 #define RESTORE_POINTERS 0x03
388 #define DISCONNECT 0x04
389 #define INITIATOR_ERROR 0x05
390 #define ABORT_TASK_SET 0x06
391 #define MESSAGE_REJECT 0x07
392 #define NOP 0x08
393 #define MSG_PARITY_ERROR 0x09
394 #define LINKED_CMD_COMPLETE 0x0a
395 #define LINKED_FLG_CMD_COMPLETE 0x0b
396 #define TARGET_RESET 0x0c
397 #define ABORT_TASK 0x0d
398 #define CLEAR_TASK_SET 0x0e
399 #define INITIATE_RECOVERY 0x0f /* SCSI-II only */
400 #define RELEASE_RECOVERY 0x10 /* SCSI-II only */
401 #define CLEAR_ACA 0x16
402 #define LOGICAL_UNIT_RESET 0x17
403 #define SIMPLE_QUEUE_TAG 0x20
404 #define HEAD_OF_QUEUE_TAG 0x21
405 #define ORDERED_QUEUE_TAG 0x22
406 #define IGNORE_WIDE_RESIDUE 0x23
407 #define ACA 0x24
408 #define QAS_REQUEST 0x55
409
410 /* Old SCSI2 names, don't use in new code */
411 #define BUS_DEVICE_RESET TARGET_RESET
412 #define ABORT ABORT_TASK_SET
413
414 /*
415 * Host byte codes
416 */
417
418 #define DID_OK 0x00 /* NO error */
419 #define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
420 #define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
421 #define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
422 #define DID_BAD_TARGET 0x04 /* BAD target. */
423 #define DID_ABORT 0x05 /* Told to abort for some other reason */
424 #define DID_PARITY 0x06 /* Parity error */
425 #define DID_ERROR 0x07 /* Internal error */
426 #define DID_RESET 0x08 /* Reset by somebody. */
427 #define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
428 #define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
429 #define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
430 #define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
431 #define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
432 * without decrementing the retry count */
433 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
434 * and the driver blocked the port to
435 * recover the link. Transport class will
436 * retry or fail IO */
437 #define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
438 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
439 * other paths */
440 #define DID_NEXUS_FAILURE 0x11 /* Permanent nexus failure, retry on other
441 * paths might yield different results */
442 #define DRIVER_OK 0x00 /* Driver status */
443
444 /*
445 * These indicate the error that occurred, and what is available.
446 */
447
448 #define DRIVER_BUSY 0x01
449 #define DRIVER_SOFT 0x02
450 #define DRIVER_MEDIA 0x03
451 #define DRIVER_ERROR 0x04
452
453 #define DRIVER_INVALID 0x05
454 #define DRIVER_TIMEOUT 0x06
455 #define DRIVER_HARD 0x07
456 #define DRIVER_SENSE 0x08
457
458 /*
459 * Internal return values.
460 */
461
462 #define NEEDS_RETRY 0x2001
463 #define SUCCESS 0x2002
464 #define FAILED 0x2003
465 #define QUEUED 0x2004
466 #define SOFT_ERROR 0x2005
467 #define ADD_TO_MLQUEUE 0x2006
468 #define TIMEOUT_ERROR 0x2007
469 #define SCSI_RETURN_NOT_HANDLED 0x2008
470 #define FAST_IO_FAIL 0x2009
471 #define TARGET_ERROR 0x200A
472
473 /*
474 * Midlevel queue return values.
475 */
476 #define SCSI_MLQUEUE_HOST_BUSY 0x1055
477 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
478 #define SCSI_MLQUEUE_EH_RETRY 0x1057
479 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
480
481 /*
482 * Use these to separate status msg and our bytes
483 *
484 * These are set by:
485 *
486 * status byte = set from target device
487 * msg_byte = return status from host adapter itself.
488 * host_byte = set by low-level driver to indicate status.
489 * driver_byte = set by mid-level.
490 */
491 #define status_byte(result) (((result) >> 1) & 0x7f)
492 #define msg_byte(result) (((result) >> 8) & 0xff)
493 #define host_byte(result) (((result) >> 16) & 0xff)
494 #define driver_byte(result) (((result) >> 24) & 0xff)
495
496 #define sense_class(sense) (((sense) >> 4) & 0x7)
497 #define sense_error(sense) ((sense) & 0xf)
498 #define sense_valid(sense) ((sense) & 0x80);
499
500 /*
501 * default timeouts
502 */
503 #define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
504 #define START_STOP_TIMEOUT (60 * HZ)
505 #define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
506 #define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
507 #define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
508
509
510 #define IDENTIFY_BASE 0x80
511 #define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
512 ((can_disconnect) ? 0x40 : 0) |\
513 ((lun) & 0x07))
514
515 /*
516 * struct scsi_device::scsi_level values. For SCSI devices other than those
517 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
518 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
519 * variable is visible to the user via sysfs.
520 */
521
522 #define SCSI_UNKNOWN 0
523 #define SCSI_1 1
524 #define SCSI_1_CCS 2
525 #define SCSI_2 3
526 #define SCSI_3 4 /* SPC */
527 #define SCSI_SPC_2 5
528 #define SCSI_SPC_3 6
529
530 /*
531 * INQ PERIPHERAL QUALIFIERS
532 */
533 #define SCSI_INQ_PQ_CON 0x00
534 #define SCSI_INQ_PQ_NOT_CON 0x01
535 #define SCSI_INQ_PQ_NOT_CAP 0x03
536
537
538 /*
539 * Here are some scsi specific ioctl commands which are sometimes useful.
540 *
541 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
542 */
543
544 /* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
545 #define SCSI_IOCTL_GET_IDLUN 0x5382
546
547 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
548
549 /* Used to obtain the host number of a device. */
550 #define SCSI_IOCTL_PROBE_HOST 0x5385
551
552 /* Used to obtain the bus number for a device */
553 #define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
554
555 /* Used to obtain the PCI location of a device */
556 #define SCSI_IOCTL_GET_PCI 0x5387
557
558 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
scsi_to_u32(__u8 * ptr)559 static inline __u32 scsi_to_u32(__u8 *ptr)
560 {
561 return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
562 }
563
564 #endif /* _SCSI_SCSI_H */
565