scsi_message.h

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/* Messages (1 byte) */          /* I/T (M)andatory or (O)ptional */
#define MSG_CMDCOMPLETE     0x00 /* M/M */
#define MSG_EXTENDED        0x01 /* O/O */
#define MSG_SAVEDATAPOINTER 0x02 /* O/O */
#define MSG_RESTOREPOINTERS 0x03 /* O/O */
#define MSG_DISCONNECT      0x04 /* O/O */
#define MSG_INITIATOR_DET_ERR   0x05 /* M/M */
#define MSG_ABORT       0x06 /* O/M */
#define MSG_MESSAGE_REJECT  0x07 /* M/M */
#define MSG_NOOP        0x08 /* M/M */
#define MSG_PARITY_ERROR    0x09 /* M/M */
#define MSG_LINK_CMD_COMPLETE   0x0a /* O/O */
#define MSG_LINK_CMD_COMPLETEF  0x0b /* O/O */
#define MSG_BUS_DEV_RESET   0x0c /* O/M */
#define MSG_ABORT_TAG       0x0d /* O/O */
#define MSG_CLEAR_QUEUE     0x0e /* O/O */
#define MSG_INIT_RECOVERY   0x0f /* O/O */
#define MSG_REL_RECOVERY    0x10 /* O/O */
#define MSG_TERM_IO_PROC    0x11 /* O/O */

/* Messages (2 byte) */
#define MSG_SIMPLE_Q_TAG    0x20 /* O/O */
#define MSG_HEAD_OF_Q_TAG   0x21 /* O/O */
#define MSG_ORDERED_Q_TAG   0x22 /* O/O */
#define MSG_IGN_WIDE_RESIDUE    0x23 /* O/O */

/* Identify message */           /* M/M */  
#define MSG_IDENTIFYFLAG    0x80 
#define MSG_IDENTIFY_DISCFLAG   0x40 
#define MSG_IDENTIFY(lun, disc) (((disc) ? 0xc0 : MSG_IDENTIFYFLAG) | (lun))
#define MSG_ISIDENTIFY(m)   ((m) & MSG_IDENTIFYFLAG)

/* Extended messages (opcode and length) */
#define MSG_EXT_SDTR        0x01
#define MSG_EXT_SDTR_LEN    0x03

#define MSG_EXT_WDTR        0x03
#define MSG_EXT_WDTR_LEN    0x02
#define MSG_EXT_WDTR_BUS_8_BIT  0x00
#define MSG_EXT_WDTR_BUS_16_BIT 0x01
#define MSG_EXT_WDTR_BUS_32_BIT 0x02

#define MSG_EXT_PPR     0x04
#define MSG_EXT_PPR_LEN 0x06
#define MSG_EXT_PPR_OPTION_ST 0x00
#define MSG_EXT_PPR_OPTION_DT_CRC 0x02
#define MSG_EXT_PPR_OPTION_DT_UNITS 0x03
#define MSG_EXT_PPR_OPTION_DT_CRC_QUICK 0x04
#define MSG_EXT_PPR_OPTION_DT_UNITS_QUICK 0x05