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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Martin Petermannfeac6a02008-07-02 10:56:35 +020012#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
14/*
James Bottomleyd3f46f32008-01-15 11:11:46 -060015 * The maximum number of SG segments that we will put inside a
16 * scatterlist (unless chaining is used). Should ideally fit inside a
17 * single page, to avoid a higher order allocation. We could define this
18 * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
19 * minimum value is 32
20 */
21#define SCSI_MAX_SG_SEGMENTS 128
22
23/*
24 * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
25 * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
26 */
27#ifdef ARCH_HAS_SG_CHAIN
28#define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
29#else
30#define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
31#endif
32
33/*
Christoph Hellwige02f3f52006-01-13 19:04:00 +010034 * Special value for scanning to specify scanning or rescanning of all
35 * possible channels, (target) ids, or luns on a given shost.
36 */
37#define SCAN_WILD_CARD ~0
38
39/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 * SCSI opcodes
41 */
42
43#define TEST_UNIT_READY 0x00
44#define REZERO_UNIT 0x01
45#define REQUEST_SENSE 0x03
46#define FORMAT_UNIT 0x04
47#define READ_BLOCK_LIMITS 0x05
48#define REASSIGN_BLOCKS 0x07
Gerd Knorr daa6eda2005-05-10 10:59:13 +020049#define INITIALIZE_ELEMENT_STATUS 0x07
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#define READ_6 0x08
51#define WRITE_6 0x0a
52#define SEEK_6 0x0b
53#define READ_REVERSE 0x0f
54#define WRITE_FILEMARKS 0x10
55#define SPACE 0x11
56#define INQUIRY 0x12
57#define RECOVER_BUFFERED_DATA 0x14
58#define MODE_SELECT 0x15
59#define RESERVE 0x16
60#define RELEASE 0x17
61#define COPY 0x18
62#define ERASE 0x19
63#define MODE_SENSE 0x1a
64#define START_STOP 0x1b
65#define RECEIVE_DIAGNOSTIC 0x1c
66#define SEND_DIAGNOSTIC 0x1d
67#define ALLOW_MEDIUM_REMOVAL 0x1e
68
69#define SET_WINDOW 0x24
70#define READ_CAPACITY 0x25
71#define READ_10 0x28
72#define WRITE_10 0x2a
73#define SEEK_10 0x2b
Gerd Knorr daa6eda2005-05-10 10:59:13 +020074#define POSITION_TO_ELEMENT 0x2b
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#define WRITE_VERIFY 0x2e
76#define VERIFY 0x2f
77#define SEARCH_HIGH 0x30
78#define SEARCH_EQUAL 0x31
79#define SEARCH_LOW 0x32
80#define SET_LIMITS 0x33
81#define PRE_FETCH 0x34
82#define READ_POSITION 0x34
83#define SYNCHRONIZE_CACHE 0x35
84#define LOCK_UNLOCK_CACHE 0x36
85#define READ_DEFECT_DATA 0x37
86#define MEDIUM_SCAN 0x38
87#define COMPARE 0x39
88#define COPY_VERIFY 0x3a
89#define WRITE_BUFFER 0x3b
90#define READ_BUFFER 0x3c
91#define UPDATE_BLOCK 0x3d
92#define READ_LONG 0x3e
93#define WRITE_LONG 0x3f
94#define CHANGE_DEFINITION 0x40
95#define WRITE_SAME 0x41
96#define READ_TOC 0x43
97#define LOG_SELECT 0x4c
98#define LOG_SENSE 0x4d
FUJITA Tomonoric639d142008-01-23 01:32:01 +090099#define XDWRITEREAD_10 0x53
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#define MODE_SELECT_10 0x55
101#define RESERVE_10 0x56
102#define RELEASE_10 0x57
103#define MODE_SENSE_10 0x5a
104#define PERSISTENT_RESERVE_IN 0x5e
105#define PERSISTENT_RESERVE_OUT 0x5f
Boaz Harroshdb4742d2008-04-30 11:27:26 +0300106#define VARIABLE_LENGTH_CMD 0x7f
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107#define REPORT_LUNS 0xa0
Hannes Reinecke5a09e392006-10-20 09:58:47 +0200108#define MAINTENANCE_IN 0xa3
Hannes Reinecke057ea7c2008-07-17 16:53:21 -0700109#define MAINTENANCE_OUT 0xa4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#define MOVE_MEDIUM 0xa5
Gerd Knorr daa6eda2005-05-10 10:59:13 +0200111#define EXCHANGE_MEDIUM 0xa6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112#define READ_12 0xa8
113#define WRITE_12 0xaa
114#define WRITE_VERIFY_12 0xae
115#define SEARCH_HIGH_12 0xb0
116#define SEARCH_EQUAL_12 0xb1
117#define SEARCH_LOW_12 0xb2
118#define READ_ELEMENT_STATUS 0xb8
119#define SEND_VOLUME_TAG 0xb6
120#define WRITE_LONG_2 0xea
121#define READ_16 0x88
122#define WRITE_16 0x8a
123#define VERIFY_16 0x8f
124#define SERVICE_ACTION_IN 0x9e
125/* values for service action in */
126#define SAI_READ_CAPACITY_16 0x10
Hannes Reinecke5a09e392006-10-20 09:58:47 +0200127/* values for maintenance in */
128#define MI_REPORT_TARGET_PGS 0x0a
Hannes Reinecke057ea7c2008-07-17 16:53:21 -0700129/* values for maintenance out */
130#define MO_SET_TARGET_PGS 0x0a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Jeff Garzikb0955182005-05-12 15:45:22 -0400132/* Values for T10/04-262r7 */
133#define ATA_16 0x85 /* 16-byte pass-thru */
134#define ATA_12 0xa1 /* 12-byte pass-thru */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136/*
Boaz Harroshdb4742d2008-04-30 11:27:26 +0300137 * SCSI command lengths
138 */
139
140#define SCSI_MAX_VARLEN_CDB_SIZE 260
141
142/* defined in T10 SCSI Primary Commands-2 (SPC2) */
143struct scsi_varlen_cdb_hdr {
144 u8 opcode; /* opcode always == VARIABLE_LENGTH_CMD */
145 u8 control;
146 u8 misc[5];
147 u8 additional_cdb_length; /* total cdb length - 8 */
148 __be16 service_action;
149 /* service specific data follows */
150};
151
152static inline unsigned
153scsi_varlen_cdb_length(const void *hdr)
154{
155 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
156}
157
158extern const unsigned char scsi_command_size_tbl[8];
159#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
160
161static inline unsigned
162scsi_command_size(const unsigned char *cmnd)
163{
164 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
165 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
166}
167
168/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 * SCSI Architecture Model (SAM) Status codes. Taken from SAM-3 draft
170 * T10/1561-D Revision 4 Draft dated 7th November 2002.
171 */
172#define SAM_STAT_GOOD 0x00
173#define SAM_STAT_CHECK_CONDITION 0x02
174#define SAM_STAT_CONDITION_MET 0x04
175#define SAM_STAT_BUSY 0x08
176#define SAM_STAT_INTERMEDIATE 0x10
177#define SAM_STAT_INTERMEDIATE_CONDITION_MET 0x14
178#define SAM_STAT_RESERVATION_CONFLICT 0x18
179#define SAM_STAT_COMMAND_TERMINATED 0x22 /* obsolete in SAM-3 */
180#define SAM_STAT_TASK_SET_FULL 0x28
181#define SAM_STAT_ACA_ACTIVE 0x30
182#define SAM_STAT_TASK_ABORTED 0x40
183
184/** scsi_status_is_good - check the status return.
185 *
186 * @status: the status passed up from the driver (including host and
187 * driver components)
188 *
189 * This returns true for known good conditions that may be treated as
190 * command completed normally
191 */
192static inline int scsi_status_is_good(int status)
193{
194 /*
195 * FIXME: bit0 is listed as reserved in SCSI-2, but is
196 * significant in SCSI-3. For now, we follow the SCSI-2
197 * behaviour and ignore reserved bits.
198 */
199 status &= 0xfe;
200 return ((status == SAM_STAT_GOOD) ||
201 (status == SAM_STAT_INTERMEDIATE) ||
202 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
203 /* FIXME: this is obsolete in SAM-3 */
204 (status == SAM_STAT_COMMAND_TERMINATED));
205}
206
207/*
208 * Status codes. These are deprecated as they are shifted 1 bit right
209 * from those found in the SCSI standards. This causes confusion for
210 * applications that are ported to several OSes. Prefer SAM Status codes
211 * above.
212 */
213
214#define GOOD 0x00
215#define CHECK_CONDITION 0x01
216#define CONDITION_GOOD 0x02
217#define BUSY 0x04
218#define INTERMEDIATE_GOOD 0x08
219#define INTERMEDIATE_C_GOOD 0x0a
220#define RESERVATION_CONFLICT 0x0c
221#define COMMAND_TERMINATED 0x11
222#define QUEUE_FULL 0x14
223#define ACA_ACTIVE 0x18
224#define TASK_ABORTED 0x20
225
226#define STATUS_MASK 0xfe
227
228/*
229 * SENSE KEYS
230 */
231
232#define NO_SENSE 0x00
233#define RECOVERED_ERROR 0x01
234#define NOT_READY 0x02
235#define MEDIUM_ERROR 0x03
236#define HARDWARE_ERROR 0x04
237#define ILLEGAL_REQUEST 0x05
238#define UNIT_ATTENTION 0x06
239#define DATA_PROTECT 0x07
240#define BLANK_CHECK 0x08
241#define COPY_ABORTED 0x0a
242#define ABORTED_COMMAND 0x0b
243#define VOLUME_OVERFLOW 0x0d
244#define MISCOMPARE 0x0e
245
246
247/*
248 * DEVICE TYPES
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +0400249 * Please keep them in 0x%02x format for $MODALIAS to work
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 */
251
252#define TYPE_DISK 0x00
253#define TYPE_TAPE 0x01
254#define TYPE_PRINTER 0x02
255#define TYPE_PROCESSOR 0x03 /* HP scanners use this */
256#define TYPE_WORM 0x04 /* Treated as ROM by our system */
257#define TYPE_ROM 0x05
258#define TYPE_SCANNER 0x06
259#define TYPE_MOD 0x07 /* Magneto-optical disk -
260 * - treated as TYPE_DISK */
261#define TYPE_MEDIUM_CHANGER 0x08
262#define TYPE_COMM 0x09 /* Communications device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263#define TYPE_RAID 0x0c
James Bottomley7f602c52005-05-21 10:24:37 -0500264#define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */
Al Viro 631e8a12005-05-16 01:59:55 +0100265#define TYPE_RBC 0x0e
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266#define TYPE_NO_LUN 0x7f
267
James Bottomley89dddbc2008-02-03 15:32:59 -0600268/* SCSI protocols; these are taken from SPC-3 section 7.5 */
269enum scsi_protocol {
270 SCSI_PROTOCOL_FCP = 0, /* Fibre Channel */
271 SCSI_PROTOCOL_SPI = 1, /* parallel SCSI */
272 SCSI_PROTOCOL_SSA = 2, /* Serial Storage Architecture - Obsolete */
273 SCSI_PROTOCOL_SBP = 3, /* firewire */
274 SCSI_PROTOCOL_SRP = 4, /* Infiniband RDMA */
275 SCSI_PROTOCOL_ISCSI = 5,
276 SCSI_PROTOCOL_SAS = 6,
277 SCSI_PROTOCOL_ADT = 7, /* Media Changers */
278 SCSI_PROTOCOL_ATA = 8,
279 SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
280};
281
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600282/* Returns a human-readable name for the device */
283extern const char * scsi_device_type(unsigned type);
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285/*
286 * standard mode-select header prepended to all mode-select commands
287 */
288
289struct ccs_modesel_head {
290 __u8 _r1; /* reserved */
291 __u8 medium; /* device-specific medium type */
292 __u8 _r2; /* reserved */
293 __u8 block_desc_length; /* block descriptor length */
294 __u8 density; /* device-specific density code */
295 __u8 number_blocks_hi; /* number of blocks in this block desc */
296 __u8 number_blocks_med;
297 __u8 number_blocks_lo;
298 __u8 _r3;
299 __u8 block_length_hi; /* block length for blocks in this desc */
300 __u8 block_length_med;
301 __u8 block_length_lo;
302};
303
304/*
305 * ScsiLun: 8 byte LUN.
306 */
307struct scsi_lun {
308 __u8 scsi_lun[8];
309};
310
311/*
James Bottomley01b291b2008-08-21 15:14:14 -0500312 * The Well Known LUNS (SAM-3) in our int representation of a LUN
313 */
314#define SCSI_W_LUN_BASE 0xc100
315#define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
316#define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
317#define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
318
319static inline int scsi_is_wlun(unsigned int lun)
320{
321 return (lun & 0xff00) == SCSI_W_LUN_BASE;
322}
323
324
325/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 * MESSAGE CODES
327 */
328
329#define COMMAND_COMPLETE 0x00
330#define EXTENDED_MESSAGE 0x01
331#define EXTENDED_MODIFY_DATA_POINTER 0x00
332#define EXTENDED_SDTR 0x01
333#define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
334#define EXTENDED_WDTR 0x03
335#define EXTENDED_PPR 0x04
336#define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
337#define SAVE_POINTERS 0x02
338#define RESTORE_POINTERS 0x03
339#define DISCONNECT 0x04
340#define INITIATOR_ERROR 0x05
341#define ABORT_TASK_SET 0x06
342#define MESSAGE_REJECT 0x07
343#define NOP 0x08
344#define MSG_PARITY_ERROR 0x09
345#define LINKED_CMD_COMPLETE 0x0a
346#define LINKED_FLG_CMD_COMPLETE 0x0b
347#define TARGET_RESET 0x0c
348#define ABORT_TASK 0x0d
349#define CLEAR_TASK_SET 0x0e
350#define INITIATE_RECOVERY 0x0f /* SCSI-II only */
351#define RELEASE_RECOVERY 0x10 /* SCSI-II only */
352#define CLEAR_ACA 0x16
353#define LOGICAL_UNIT_RESET 0x17
354#define SIMPLE_QUEUE_TAG 0x20
355#define HEAD_OF_QUEUE_TAG 0x21
356#define ORDERED_QUEUE_TAG 0x22
357#define IGNORE_WIDE_RESIDUE 0x23
358#define ACA 0x24
359#define QAS_REQUEST 0x55
360
361/* Old SCSI2 names, don't use in new code */
362#define BUS_DEVICE_RESET TARGET_RESET
363#define ABORT ABORT_TASK_SET
364
365/*
366 * Host byte codes
367 */
368
369#define DID_OK 0x00 /* NO error */
370#define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
371#define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
372#define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
373#define DID_BAD_TARGET 0x04 /* BAD target. */
374#define DID_ABORT 0x05 /* Told to abort for some other reason */
375#define DID_PARITY 0x06 /* Parity error */
376#define DID_ERROR 0x07 /* Internal error */
377#define DID_RESET 0x08 /* Reset by somebody. */
378#define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
379#define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
380#define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
381#define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
bf341912005-04-12 17:49:09 -0500382#define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
383 * without decrementing the retry count */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384#define DRIVER_OK 0x00 /* Driver status */
385
386/*
387 * These indicate the error that occurred, and what is available.
388 */
389
390#define DRIVER_BUSY 0x01
391#define DRIVER_SOFT 0x02
392#define DRIVER_MEDIA 0x03
393#define DRIVER_ERROR 0x04
394
395#define DRIVER_INVALID 0x05
396#define DRIVER_TIMEOUT 0x06
397#define DRIVER_HARD 0x07
398#define DRIVER_SENSE 0x08
399
400#define SUGGEST_RETRY 0x10
401#define SUGGEST_ABORT 0x20
402#define SUGGEST_REMAP 0x30
403#define SUGGEST_DIE 0x40
404#define SUGGEST_SENSE 0x80
405#define SUGGEST_IS_OK 0xff
406
407#define DRIVER_MASK 0x0f
408#define SUGGEST_MASK 0xf0
409
410/*
411 * Internal return values.
412 */
413
414#define NEEDS_RETRY 0x2001
415#define SUCCESS 0x2002
416#define FAILED 0x2003
417#define QUEUED 0x2004
418#define SOFT_ERROR 0x2005
419#define ADD_TO_MLQUEUE 0x2006
420#define TIMEOUT_ERROR 0x2007
Chandra Seetharamana6a8d9f2008-05-01 14:49:46 -0700421#define SCSI_RETURN_NOT_HANDLED 0x2008
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423/*
424 * Midlevel queue return values.
425 */
426#define SCSI_MLQUEUE_HOST_BUSY 0x1055
427#define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
428#define SCSI_MLQUEUE_EH_RETRY 0x1057
Mike Christief0c0a372008-08-17 15:24:38 -0500429#define SCSI_MLQUEUE_TARGET_BUSY 0x1058
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431/*
432 * Use these to separate status msg and our bytes
433 *
434 * These are set by:
435 *
436 * status byte = set from target device
437 * msg_byte = return status from host adapter itself.
438 * host_byte = set by low-level driver to indicate status.
439 * driver_byte = set by mid-level.
440 */
441#define status_byte(result) (((result) >> 1) & 0x7f)
442#define msg_byte(result) (((result) >> 8) & 0xff)
443#define host_byte(result) (((result) >> 16) & 0xff)
444#define driver_byte(result) (((result) >> 24) & 0xff)
445#define suggestion(result) (driver_byte(result) & SUGGEST_MASK)
446
Martin Petermannfeac6a02008-07-02 10:56:35 +0200447static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
448{
449 cmd->result |= status << 8;
450}
451
452static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
453{
454 cmd->result |= status << 16;
455}
456
457static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
458{
459 cmd->result |= status << 24;
460}
461
462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463#define sense_class(sense) (((sense) >> 4) & 0x7)
464#define sense_error(sense) ((sense) & 0xf)
465#define sense_valid(sense) ((sense) & 0x80);
466
b6651122005-04-03 14:52:44 -0500467/*
468 * default timeouts
469*/
470#define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
471#define START_STOP_TIMEOUT (60 * HZ)
472#define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
473#define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
474#define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477#define IDENTIFY_BASE 0x80
478#define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
479 ((can_disconnect) ? 0x40 : 0) |\
480 ((lun) & 0x07))
481
482/*
483 * struct scsi_device::scsi_level values. For SCSI devices other than those
484 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
485 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
486 * variable is visible to the user via sysfs.
487 */
488
489#define SCSI_UNKNOWN 0
490#define SCSI_1 1
491#define SCSI_1_CCS 2
492#define SCSI_2 3
493#define SCSI_3 4 /* SPC */
494#define SCSI_SPC_2 5
495#define SCSI_SPC_3 6
496
497/*
498 * INQ PERIPHERAL QUALIFIERS
499 */
500#define SCSI_INQ_PQ_CON 0x00
501#define SCSI_INQ_PQ_NOT_CON 0x01
502#define SCSI_INQ_PQ_NOT_CAP 0x03
503
504
505/*
506 * Here are some scsi specific ioctl commands which are sometimes useful.
507 *
508 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
509 */
510
511/* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
512#define SCSI_IOCTL_GET_IDLUN 0x5382
513
514/* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
515
516/* Used to obtain the host number of a device. */
517#define SCSI_IOCTL_PROBE_HOST 0x5385
518
519/* Used to obtain the bus number for a device */
520#define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
521
522/* Used to obtain the PCI location of a device */
523#define SCSI_IOCTL_GET_PCI 0x5387
524
James Bottomley2908d772006-08-29 09:22:51 -0500525/* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
FUJITA Tomonori4a531e82006-10-20 09:08:18 +0900526static inline __u32 scsi_to_u32(__u8 *ptr)
James Bottomley2908d772006-08-29 09:22:51 -0500527{
528 return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
529}
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531#endif /* _SCSI_SCSI_H */