SCSI_SETUP_CDB(9F) Kernel Functions for Drivers SCSI_SETUP_CDB(9F)

scsi_setup_cdb - setup SCSI command descriptor block (CDB)

int scsi_setup_cdb(union scsi_cdb *cdbp, uchar_t cmd, uint_t addr,
     uint_t cnt, uint_t othr_cdb_data);

illumos DDI specific (illumos DDI).

Pointer to command descriptor block.


The first byte of the SCSI group 0, 1, 2, 4, or 5 CDB.


Pointer to the location of the data.


Data transfer length in units defined by the SCSI device type. For sequential devices cnt is the number of bytes. For block devices, cnt is the number of blocks.


Additional CDB data.

The scsi_setup_cdb() function initializes a group 0, 1, 2, 4, or 5 type of command descriptor block pointed to by cdbp using cmd, addr, cnt, othr_cdb_data.

addr should be set to 0 for commands having no addressing information (for example, group 0 READ command for sequential access devices). othr_cdb_data should be additional CDB data for Group 4 commands; otherwise, it should be set to 0.

The scsi_setup_cdb() function does not set the LUN bits in CDB[1] as the makecom(9F) functions do. Also, the fixed bit for sequential access device commands is not set.

The scsi_setup_cdb() function returns:


Upon success.


Upon failure.

These functions can be called from a user, interrupt, or kernel context.

makecom(9F), scsi_pkt(9S)

Writing Device Drivers

American National Standard Small Computer System Interface-2 (SCSI-2)

American National Standard SCSI-3 Primary Commands (SPC)

January 16, 2006 OmniOS