makecom

, makecom_g0

, makecom_g0_s

, makecom_g1

, makecom_g5

- make a packet for SCSI commands

Synopsis

#include <sys/scsi/scsi.h> 

void makecom_g0(struct scsi_pkt *pkt, struct scsi_device *devp, 
     int flag, int cmd, int addr, int cnt);

void makecom_g0_s(struct scsi_pkt *pkt, struct scsi_device *devp,
     int flag, int cmd, int cnt, int fixbit);

void makecom_g1(struct scsi_pkt *pkt, struct scsi_device *devp, 
     int flag, int cmd, int addr, int cnt);

void makecom_g5(struct scsi_pkt *pkt, struct scsi_device *devp, 
     int flag, int cmd, int addr, int cnt);

Interface Level

These interfaces are obsolete. scsi_setup_cdb(9F) should be used instead.

Parameters

pkt

Pointer to an allocated scsi_pkt(9S) structure.

devp

Pointer to the target's scsi_device(9S) structure.

flag

Flags for the pkt_flags member.

cmd

First byte of a group 0 or 1 or 5 SCSI 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.

fixbit

Fixed bit in sequential access device commands.

Description

The makecom functions initialize a packet with the specified command descriptor block, devp and transport flags. The pkt_address, pkt_flags, and the command descriptor block pointed to by pkt_cdbp are initialized using the remaining arguments. Target drivers may use makecom_g0() for Group 0 commands (except for sequential access devices), or makecom_g0_s() for Group 0 commands for sequential access devices, or makecom_g1() for Group 1 commands, or makecom_g5() for Group 5 commands. fixbit is used by sequential access devices for accessing fixed block sizes and sets the tag portion of the SCSI CDB.

Context

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

Examples

Example 1 Using makecom Functions

if (blkno >= (1<<20)) {
      makecom_g1(pkt, SD_SCSI_DEVP, pflag, SCMD_WRITE_G1,
         (int) blkno, nblk);
} else {
      makecom_g0(pkt, SD_SCSI_DEVP, pflag, SCMD_WRITE,
         (int) blkno, nblk);
}

Attributes

See attributes(5) for a description of the following attributes:

See Also

attributes(5), scsi_setup_cdb(9F), scsi_device(9S), scsi_pkt(9S)

ANSI Small Computer System Interface-2 (SCSI-2)

Writing Device Drivers

Notes

The makecom_g0(), makecom_g0_s(), makecom_g1(), and makecom_g5() functions are obsolete and will be discontinued in a future release. These functions have been replaced by the scsi_setup_cdb() function. See scsi_setup_cdb(9F).