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

NAME

scsi_setup_cdb - setup SCSI command descriptor block (CDB)

SYNOPSIS

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

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

cdbp
Pointer to command descriptor block.


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


addr
Pointer to the location of the data.


cnt
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.


othr_cdb_data
Additional CDB data.

DESCRIPTION

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.

RETURN VALUES

The scsi_setup_cdb() function returns:

1
Upon success.


0
Upon failure.

CONTEXT

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

SEE ALSO

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 SCSI_SETUP_CDB(9F)