FDIO(4I) Ioctl Requests FDIO(4I)

NAME

fdio - floppy disk control operations

SYNOPSIS

#include <sys/fdio.h>

DESCRIPTION

The Solaris floppy driver supports a set of ioctl(2) requests for getting
and setting the floppy drive characteristics. Basic to these ioctl(2)
requests are the definitions in <sys/fdio.h>.

IOCTLS

The following ioctl(2) requests are available on the Solaris floppy driver.

FDDEFGEOCHAR x86 based systems: This ioctl(2) forces the floppy driver to
restore the diskette and drive characteristics and geometry,
and partition information to default values based on the
device configuration.

FDGETCHANGE The argument is a pointer to an int. This ioctl(2) returns
the status of the diskette-changed signal from the floppy
interface. The following defines are provided for cohesion.

Note: For x86 based systems, use FDGC_DETECTED (which is available only on
x86 based systems) instead of FDGC_HISTORY.

/*
* Used by FDGETCHANGE, returned state of the sense disk change bit.
*/
#define FDGC_HISTORY 0x01 /*
* disk has changed since insertion or
* last FDGETCHANGE call
*/
#define FDGC_CURRENT 0x02 /*
* if set, indicates drive has floppy,
* otherwise, drive is empty
*/
#define FDGC_CURWPROT 0x10 /* current state of write protect */
#define FDGC_DETECTED 0x20 /* previous state of DISK CHANGE */

FDIOGCHAR The argument is a pointer to an fd_char structure (described
below). This ioctl(2) gets the characteristics of the floppy
diskette from the floppy controller.

FDIOSCHAR The argument is a pointer to an fd_char structure (described
below). This ioctl(2) sets the characteristics of the floppy
diskette for the floppy controller. Typical values in the
fd_char structure for a high density diskette:

Field Value
fdc_medium 0
fdc_transfer_rate 500
fdc_ncyl 80
fdc_nhead 2
fdc_sec_size 512
fdc_secptrack 18
fdc_steps -1 { This field doesn't apply. }

/*
* Floppy characteristics
*/
struct fd_char {
uchar_t fdc_medium; /* equals 1 if floppy is medium density format */
int fdc_transfer_rate; /* transfer rate */
int fdc_ncyl; /* number of cylinders */
int fdc_nhead; /* number of heads */
int fdc_sec_size; /* sector size */
int fdc_secptrack; /* sectors per track */
int fdc_steps; /* no. of steps per data track */
};

FDGETDRIVECHAR The argument to this ioctl(2) is a pointer to an fd_drive
structure (described below). This ioctl(2) gets the
characteristics of the floppy drive from the floppy
controller.

FDSETDRIVECHAR x86 based systems: The argument to this ioctl(2) is a
pointer to an fd_drive structure (described below). This
ioctl(2) sets the characteristics of the floppy drive for
the floppy controller. Only fdd_steprate, fdd_headsettle,
fdd_motoron, and fdd_motoroff are actually used by the
floppy disk driver.

/*
* Floppy Drive characteristics
*/
struct fd_drive {
int fdd_ejectable; /* does the drive support eject? */
int fdd_maxsearch; /* size of per-unit search table */
int fdd_writeprecomp; /* cyl to start write precompensation */
int fdd_writereduce; /* cyl to start reducing write current */
int fdd_stepwidth; /* width of step pulse in 1 us units */
int fdd_steprate; /* step rate in 100 us units */
int fdd_headsettle; /* delay, in 100 us units */
int fdd_headload; /* delay, in 100 us units */
int fdd_headunload; /* delay, in 100 us units */
int fdd_motoron; /* delay, in 100 ms units */
int fdd_motoroff; /* delay, in 100 ms units */
int fdd_precomplevel; /* bit shift, in nano-secs */
int fdd_pins; /* defines meaning of pin 1, 2, 4 and 34 */
int fdd_flags; /* TRUE READY, Starting Sector #, & Motor On */
};

FDGETSEARCH Not available.

FDSETSEARCH Not available.

FDEJECT SPARC: This ioctl(2) requests the floppy drive to eject the
diskette.

FDIOCMD The argument is a pointer to an fd_cmd structure (described
below). This ioctl(2) allows access to the floppy diskette
using the floppy device driver. Only the FDCMD_WRITE,
FDCMD_READ, and FDCMD_FORMAT_TRACK commands are currently
available.

struct fd_cmd {
ushort_t fdc_cmd; /* command to be executed */
int fdc_flags; /* execution flags (x86 only) */
daddr_t fdc_blkno; /* disk address for command */
int fdc_secnt; /* sector count for command */
caddr_t fdc_bufaddr; /* user's buffer address */
uint_t fdc_buflen; /* size of user's buffer */
};

Please note that the fdc_buflen field is currently unused. The fdc_secnt
field is used to calculate the transfer size, and the buffer is assumed to
be large enough to accommodate the transfer.

/*
* Floppy commands
*/
#define FDCMD_WRITE 1
#define FDCMD_READ 2
#define FDCMD_SEEK 3
#define FDCMD_REZERO 4
#define FDCMD_FORMAT_UNIT 5
#define FDCMD_FORMAT_TRACK 6

FDRAW The argument is a pointer to an fd_raw structure (described below).
This ioctl(2) allows direct control of the floppy drive using the
floppy controller. Refer to the appropriate floppy-controller data
sheet for full details on required command bytes and returned result
bytes. The following commands are supported.

/*
* Floppy raw commands
*/
#define FDRAW_SPECIFY 0x03
#define FDRAW_READID 0x0a (x86 only)
#define FDRAW_SENSE_DRV 0x04
#define FDRAW_REZERO 0x07
#define FDRAW_SEEK 0x0f
#define FDRAW_SENSE_INT 0x08 (x86 only)
#define FDRAW_FORMAT 0x0d
#define FDRAW_READTRACK 0x02
#define FDRAW_WRCMD 0x05
#define FDRAW_RDCMD 0x06
#define FDRAW_WRITEDEL 0x09
#define FDRAW_READDEL 0x0c

Please note that when using FDRAW_SEEK or FDRAW_REZERO, the driver
automatically issues a FDRAW_SENSE_INT command to clear the interrupt from
the FDRAW_SEEK or the FDRAW_REZERO. The result bytes returned by these
commands are the results from the DRAW_SENSE_INT command. Please see the
floppy-controller data sheet for more details on FDRAW_SENSE_INT.

/*
* Used by FDRAW
*/
struct fd_raw {
char fdr_cmd[10]; /* user-supplied command bytes */
short fdr_cnum; /* number of command bytes */
char fdr_result[10]; /* controller-supplied result bytes */
ushort_t fdr_nbytes; /* number to transfer if read/write command */
char *fdr_addr; /* where to transfer if read/write command */
};

SEE ALSO

ioctl(2), fd(4D), dkio(4I), hdio(4I)

illumos March 13, 2022 illumos