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BSD 4_4 release
[unix-history] / usr / src / sys / vax / uba / rx.c
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)rx.c 7.5 (Berkeley) 12/16/90
*/
#include "rx.h"
#if NFX > 0
/*
* RX02 floppy disk device driver
*
*/
/*
* TODO:
* - clean up the code for multisector transfers using
* a 'transfer in progress' flag
* - Test Deleted Data read/write
* - Test error handling/reporting and 'volume valid' stuff
*
* Note: If the drive subsystem is
* powered off at boot time, the controller won't interrupt!
*/
#include "../include/pte.h"
#include "sys/param.h"
#include "sys/buf.h"
#include "sys/systm.h"
#include "sys/conf.h"
#include "sys/errno.h"
#include "sys/time.h"
#include "sys/kernel.h"
#include "sys/uio.h"
#include "sys/file.h"
#include "../include/cpu.h"
#include "../vax/nexus.h"
#include "ubavar.h"
#include "ubareg.h"
#include "rxreg.h"
#define b_cylin b_resid
/* per-controller data */
struct rx_ctlr {
int rxc_state; /* controller state */
#define RXS_READ 1 /* read started */
#define RXS_EMPTY 2 /* empty started */
#define RXS_FILL 3 /* fill started */
#define RXS_WRITE 4 /* write started */
#define RXS_FORMAT 5 /* format started */
#define RXS_RDSTAT 6 /* status read started */
#define RXS_RDERR 7 /* error read started */
#define RXS_IDLE 8 /* device is idle */
u_short rxc_rxcs; /* extended error status */
u_short rxc_rxdb;
u_short rxc_rxxt[4];
int rxc_tocnt; /* for watchdog routine */
#define RX_MAXTIMEOUT 30 /* # seconds to wait before giving up */
} rx_ctlr[NFX];
/* per-drive buffers */
struct buf rrxbuf[NRX]; /* buffers for raw I/O */
struct buf erxbuf[NRX]; /* buffers for reading error status */
struct buf rxutab[NRX]; /* per drive buffers */
/* per-drive data */
struct rx_softc {
int sc_flags; /* drive status flags */
#define RXF_DIRECT 0x01 /* if set: use direct sector mapping */
#define RXF_TRKONE 0x02 /* if set: start mapping on track 1 */
#define RXF_DBLDEN 0x04 /* use double density */
#define RXF_DEVTYPE 0x07 /* mapping flags */
#define RXF_LOCK 0x10 /* exclusive use */
#define RXF_DDMK 0x20 /* deleted-data mark detected */
#define RXF_USEWDDS 0x40 /* write deleted-data sector */
#define RXF_FORMAT 0x80 /* format in progress */
#define RXF_BAD 0x100 /* drive bad, cannot be used */
int sc_csbits; /* constant bits for CS register */
int sc_open; /* count number of opens */
int sc_offset; /* raw mode kludge to avoid restricting */
/* single sector transfers to start on */
/* DEV_BSIZE boundaries */
/*
* The rest of this structure is used to
* store temporaries while simulating multi
* sector transfers
*/
caddr_t sc_uaddr; /* unibus base address */
long sc_bcnt; /* total transfer count */
long sc_resid; /* no. of bytes left to transfer */
} rx_softc[NRX];
struct rxerr {
short rxcs;
short rxdb;
short rxxt[4]; /* error code dump from controller */
} rxerr[NRX];
/* End of per-drive data */
struct uba_device *rxdinfo[NRX];
struct uba_ctlr *rxminfo[NFX];
struct buf *savebp;
int rxprobe(), rxslave(), rxattach(), rxdgo(), rxintr(), rxwatch(), rxphys();
u_short rxstd[] = { 0177170, 0177150, 0 };
struct uba_driver fxdriver =
{ rxprobe, rxslave, rxattach, rxdgo, rxstd, "rx", rxdinfo, "fx", rxminfo };
int rxwstart;
#define RXUNIT(dev) (minor(dev)>>3)
#define MASKREG(reg) (reg&0xffff)
/* constants related to floppy data capacity */
#define RXSECS 2002 /* # sectors on a floppy */
#define DDSTATE (sc->sc_csbits&RX_DDEN)
#define NBPS (DDSTATE ? 256 : 128) /* # bytes per sector */
#define RXSIZE (DDSTATE ? 512512 : 256256) /* # bytes per disk */
#define SECMASK (DDSTATE ? 0xff : 0x7f) /* shifted-out bits of offset */
#define B_CTRL 0x80000000 /* control (format) request */
#define B_RDSTAT 0x40000000 /* read drive status (open) */
/*ARGSUSED*/
rxprobe (reg)
caddr_t reg;
{
register int br, cvec; /* value-result */
struct rxdevice *rxaddr = (struct rxdevice *)reg;
#ifdef lint
br = 0; cvec = br; br = cvec;
rxintr(0);
#endif lint
rxaddr->rxcs = RX_INTR;
DELAY(10);
rxaddr->rxcs = 0;
return (sizeof (*rxaddr));
}
/*ARGSUSED*/
rxslave(ui, reg)
struct uba_device *ui;
caddr_t reg;
{
return (ui->ui_slave == 0 || ui->ui_slave == 1);
}
/*ARGSUSED*/
rxattach(ui)
struct uba_device *ui;
{
}
/*ARGSUSED1*/
rxopen(dev, flag)
dev_t dev;
{
register int unit = RXUNIT(dev);
register struct rx_softc *sc;
register struct uba_device *ui;
struct rx_ctlr *rxc;
if (unit >= NRX || (ui = rxdinfo[unit]) == 0 || ui->ui_alive == 0)
return (ENXIO);
sc = &rx_softc[unit];
if (sc->sc_open == 0 && sc->sc_csbits == 0) {
struct buf *bp = &erxbuf[unit];
/*
* lock the device while an open
* is in progress
*/
sc->sc_flags = (minor(dev) & RXF_DEVTYPE) | RXF_LOCK;
sc->sc_csbits = RX_INTR;
sc->sc_csbits |= ui->ui_slave == 0 ? RX_DRV0 : RX_DRV1;
bp->b_dev = dev;
bp->b_flags = B_RDSTAT | B_BUSY;
bp->b_error = 0;
bp->b_blkno = 0;
sc->sc_offset = 0;
sc->sc_resid = 0;
/*
* read device status to determine if
* a floppy is present in the drive and
* what density it is
*/
rxstrategy(bp);
iowait(bp);
if (bp->b_flags & B_ERROR) {
sc->sc_csbits = 0;
sc->sc_flags &= ~RXF_LOCK;
return (bp->b_error);
}
if (rxwstart++ == 0) {
rxc = &rx_ctlr[ui->ui_mi->um_ctlr];
rxc->rxc_tocnt = 0;
timeout(rxwatch, (caddr_t)0, hz); /* start watchdog */
}
#ifdef RXDEBUG
printf("rxopen: csbits=0x%x\n", sc->sc_csbits);
#endif
sc->sc_flags &= ~RXF_LOCK;
} else {
if (sc->sc_flags & RXF_LOCK)
return(EBUSY);
}
sc->sc_open = 1;
return (0);
}
/*ARGSUSED1*/
rxclose(dev, flag)
dev_t dev;
{
register struct rx_softc *sc = &rx_softc[RXUNIT(dev)];
sc->sc_open = 0;
#ifdef RXDEBUG
printf("rxclose: dev=0x%x, sc_open=%d\n", dev, sc->sc_open);
#endif
return (0);
}
rxstrategy(bp)
register struct buf *bp;
{
struct uba_device *ui;
register struct buf *dp;
struct rx_softc *sc;
int s, unit = RXUNIT(bp->b_dev);
if (unit >= NRX)
goto bad;
ui = rxdinfo[unit];
if (ui == 0 || ui->ui_alive == 0)
goto bad;
sc = &rx_softc[unit];
if (bp->b_blkno < 0 || dbtob(bp->b_blkno) > RXSIZE)
goto bad;
if (sc->sc_flags & RXF_BAD) {
bp->b_error = EIO;
goto dbad;
}
s = spl5();
#ifdef RXDEBUG
printf("rxstrat: bp=0x%x, fl=0x%x, un=%d, bl=%d, cnt=%d\n",
bp, bp->b_flags, unit, bp->b_blkno, bp->b_bcount);
#endif
bp->b_cylin = bp->b_blkno; /* don't care to calculate trackno */
dp = &rxutab[unit];
disksort(dp, bp);
if (dp->b_active == 0) {
rxustart(ui);
bp = &ui->ui_mi->um_tab;
if (bp->b_actf && bp->b_active == 0)
rxstart(ui->ui_mi);
}
splx(s);
return;
bad:
bp->b_error = ENXIO;
dbad:
bp->b_flags |= B_ERROR;
iodone(bp);
return;
}
/*
* Unit start routine.
* Put this unit on the ready queue for the controller
*/
rxustart(ui)
register struct uba_device *ui;
{
struct buf *dp = &rxutab[ui->ui_unit];
struct uba_ctlr *um = ui->ui_mi;
dp->b_forw = NULL;
if (um->um_tab.b_actf == NULL)
um->um_tab.b_actf = dp;
else
um->um_tab.b_actl->b_forw = dp;
um->um_tab.b_actl = dp;
dp->b_active++;
}
/*
* Sector mapping routine.
* Two independent sets of choices are available:
*
* (a) The first logical sector may either be on track 1 or track 0.
* (b) The sectors on a track may either be taken in 2-for-1 interleaved
* fashion or directly.
* This gives a total of four possible mapping schemes.
*
* Physical tracks on the RX02 are numbered 0-76. Physical sectors on
* each track are numbered 1-26.
*
* When interleaving is used, sectors on the first logical track are
* taken in the order 1, 3, 5, ..., 25, 2, 4, 6, ..., 26. A skew of
* six sectors per track is also used (to allow time for the heads to
* move); hence, the sectors on the second logical track are taken in
* the order 7, 9, 11, ..., 25, 1, 3, 5, 8, 10, 12, ..., 26, 2, 4, 6;
* the third logical track starts with sector 13; and so on.
*
* When the mapping starts with track 1, track 0 is the last logical
* track, and this track is always handled directly (without inter-
* leaving), even when the rest of the disk is interleaved. (This is
* still compatible with DEC RT-11, which does not use track 0 at all.)
*/
rxmap(bp, psector, ptrack)
struct buf *bp;
int *psector, *ptrack;
{
register int lt, ls, ptoff;
struct rx_softc *sc = &rx_softc[RXUNIT(bp->b_dev)];
ls = (dbtob(bp->b_blkno) + (sc->sc_offset - sc->sc_resid)) / NBPS;
lt = ls / 26;
ls %= 26;
/*
* The "physical track offset" (ptoff) takes the
* starting physical track (0 or 1) and the desired
* interleaving into account. If lt+ptoff >= 77,
* then interleaving is not performed.
*/
ptoff = 0;
if (sc->sc_flags & RXF_DIRECT)
ptoff = 77;
if (sc->sc_flags & RXF_TRKONE)
ptoff++;
if (lt + ptoff < 77)
ls = ((ls << 1) + (ls >= 13) + (6*lt)) % 26;
*ptrack = (lt + ptoff) % 77;
*psector = ls + 1;
}
/*
* Controller start routine.
* Start a new transfer or continue a multisector
* transfer. If this is a new transfer (dp->b_active == 1)
* save the start address of the data buffer and the total
* byte count in the soft control structure. These are
* restored into the buffer structure when the transfer has
* been completed, before calling 'iodone'.
*/
rxstart(um)
register struct uba_ctlr *um;
{
register struct rxdevice *rxaddr;
register struct rx_ctlr *rxc;
register struct rx_softc *sc;
struct buf *dp, *bp;
int unit, sector, track;
if (um->um_tab.b_active)
return;
loop:
if ((dp = um->um_tab.b_actf) == NULL)
return;
if ((bp = dp->b_actf) == NULL) {
um->um_tab.b_actf = dp->b_forw;
goto loop;
}
um->um_tab.b_active++;
unit = RXUNIT(bp->b_dev);
sc = &rx_softc[unit];
if (sc->sc_flags & RXF_BAD) {
rxpurge(um);
return;
}
if (dp->b_active == 1) {
sc->sc_resid = bp->b_bcount;
sc->sc_uaddr = bp->b_un.b_addr;
sc->sc_bcnt = bp->b_bcount;
sc->sc_offset += sc->sc_bcnt;
dp->b_active++;
}
rxaddr = (struct rxdevice *)um->um_addr;
rxc = &rx_ctlr[um->um_ctlr];
bp->b_bcount = sc->sc_resid;
if (bp->b_bcount > NBPS)
bp->b_bcount = NBPS;
rxc->rxc_tocnt = 0;
#ifdef RXDEBUG
printf("rxstart: ");
#endif
if (rxaddr->rxcs == 0x800) {
/*
* 'Volume valid'? (check if the
* drive unit has been powered down)
*/
rxaddr->rxcs = RX_INIT;
while((rxaddr->rxcs&RX_DONE) == 0)
;
}
if (bp->b_flags & B_CTRL) { /* format */
rxc->rxc_state = RXS_FORMAT;
rxaddr->rxcs = RX_FORMAT | sc->sc_csbits;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = 'I';
return;
}
if (bp->b_flags & B_RDSTAT) { /* read drive status */
rxc->rxc_state = RXS_RDSTAT;
rxaddr->rxcs = RX_RDSTAT | sc->sc_csbits;
return;
}
if (bp->b_flags & B_READ) {
rxmap(bp, &sector, &track); /* read */
#ifdef RXDEBUG
printf("read tr=%d, sc=%d", track, sector);
#endif
rxc->rxc_state = RXS_READ;
rxaddr->rxcs = RX_READ | sc->sc_csbits;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = (u_short)sector;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = (u_short)track;
} else {
#ifdef RXDEBUG
printf("write");
#endif
rxc->rxc_state = RXS_FILL; /* write */
um->um_cmd = RX_FILL;
(void) ubago(rxdinfo[unit]);
}
#ifdef RXDEBUG
printf("\n");
#endif
}
rxdgo(um)
struct uba_ctlr *um;
{
register struct rxdevice *rxaddr = (struct rxdevice *)um->um_addr;
int ubinfo = um->um_ubinfo;
struct buf *bp = um->um_tab.b_actf->b_actf;
struct rx_softc *sc = &rx_softc[RXUNIT(bp->b_dev)];
struct rx_ctlr *rxc = &rx_ctlr[um->um_ctlr];
rxaddr->rxcs = um->um_cmd | ((ubinfo & 0x30000) >> 4) | sc->sc_csbits;
if (rxc->rxc_state != RXS_RDERR) {
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = (u_short) bp->b_bcount >> 1;
}
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = (u_short) ubinfo;
}
rxintr(ctlr)
int ctlr;
{
int unit, sector, track;
struct uba_ctlr *um = rxminfo[ctlr];
register struct rxdevice *rxaddr;
register struct buf *bp, *dp;
register struct rx_softc *sc;
struct uba_device *ui;
struct rxerr *er;
struct rx_ctlr *rxc;
if (!um->um_tab.b_active)
return;
dp = um->um_tab.b_actf;
if (!dp->b_active)
return;
bp = dp->b_actf;
unit = RXUNIT(bp->b_dev);
sc = &rx_softc[unit];
ui = rxdinfo[unit];
rxaddr = (struct rxdevice *)um->um_addr;
rxc = &rx_ctlr[um->um_ctlr];
rxc->rxc_tocnt = 0;
er = &rxerr[unit];
#ifdef RXDEBUG
printf("rxint: dev=%x, st=%d, cs=0x%x, db=0x%x\n",
bp->b_dev, rxc->rxc_state, rxaddr->rxcs, rxaddr->rxdb);
#endif
if ((rxaddr->rxcs & RX_ERR) &&
(rxc->rxc_state != RXS_RDSTAT) && (rxc->rxc_state != RXS_RDERR))
goto error;
switch (rxc->rxc_state) {
/*
* Incomplete commands. Perform next step
* and return. Note that b_active is set on
* entrance and, therefore, also on exit.
*/
case RXS_READ:
if (rxaddr->rxdb & RXES_DDMARK)
sc->sc_flags |= RXF_DDMK;
else
sc->sc_flags &= ~RXF_DDMK;
rxc->rxc_state = RXS_EMPTY;
um->um_cmd = RX_EMPTY;
(void) ubago(ui);
return;
case RXS_FILL:
rxc->rxc_state = RXS_WRITE;
if (sc->sc_flags & RXF_USEWDDS) {
rxaddr->rxcs = RX_WDDS | sc->sc_csbits;
sc->sc_flags &= ~RXF_USEWDDS;
} else
rxaddr->rxcs = RX_WRITE | sc->sc_csbits;
rxmap(bp, &sector, &track);
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = sector;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = track;
return;
/*
* Possibly completed command.
*/
case RXS_RDSTAT:
if (bp->b_flags & B_RDSTAT) {
if ((rxaddr->rxdb&RXES_READY) == 0) {
bp->b_flags |= B_ERROR;
bp->b_error = ENODEV;
} else {
sc->sc_csbits |= rxaddr->rxdb&RXES_DBLDEN ?
RX_DDEN : RX_SDEN;
}
goto rdone;
}
if (rxaddr->rxdb&RXES_READY)
goto rderr;
bp->b_error = ENODEV;
bp->b_flags |= B_ERROR;
goto done;
/*
* Command completed.
*/
case RXS_EMPTY:
case RXS_WRITE:
goto done;
case RXS_FORMAT:
goto rdone;
case RXS_RDERR:
bp = savebp;
rxmap(bp, &sector, &track);
printf("rx%d: hard error, trk %d psec %d ",
unit, track, sector);
printf("cs=%b, db=%b, err=", MASKREG(er->rxcs),
RXCS_BITS, MASKREG(er->rxdb), RXES_BITS);
printf("%x, %x, %x, %x\n", MASKREG(er->rxxt[0]),
MASKREG(er->rxxt[1]), MASKREG(er->rxxt[2]),
MASKREG(er->rxxt[3]));
goto done;
default:
printf("rx%d: state %d (reset)\n", unit, rxc->rxc_state);
rxreset(um->um_ubanum);
return;
}
error:
/*
* In case of an error:
* (a) Give up now if a format (ioctl) was in progress, if a
* density error was detected, or if the drive went offline
* (b) Retry up to nine times if a CRC (data) error was detected,
* then give up if the error persists.
* (c) In all other cases, reinitialize the drive and try the
* operation once more before giving up.
*/
if (rxc->rxc_state == RXS_FORMAT || (rxaddr->rxdb&RXES_DENERR))
goto giveup;
if (rxaddr->rxdb & RXES_CRCERR) {
if (++um->um_tab.b_errcnt >= 10)
goto giveup;
goto retry;
}
um->um_tab.b_errcnt += 9;
if (um->um_tab.b_errcnt >= 10)
goto giveup;
rxaddr->rxcs = RX_INIT;
/* no way to get an interrupt for "init done", so just wait */
while ((rxaddr->rxcs&RX_DONE) == 0)
;
/* if someone opened the drive: give up */
if ((rxaddr->rxdb&RXES_READY) == 0)
goto giveup;
retry:
/*
* In case we already have UNIBUS resources, give
* them back since we reallocate things in rxstart.
*/
if (um->um_ubinfo)
ubadone(um);
um->um_tab.b_active = 0;
rxstart(um);
return;
giveup:
/*
* Hard I/O error --
* ALL errors are considered fatal and will abort the
* transfer and purge the i/o request queue
*/
sc->sc_flags |= RXF_BAD;
sc->sc_resid = 0; /* make sure the transfer is terminated */
rxc->rxc_state = RXS_RDSTAT;
rxaddr->rxcs = RX_RDSTAT | sc->sc_csbits;
return;
rderr:
/*
* A hard error (other than not ready) has occurred.
* Read the extended error status information.
* Before doing this, save the current CS and DB register values,
* because the read error status operation may modify them.
* Insert buffer with request at the head of the queue.
*/
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
if (um->um_ubinfo)
ubadone(um);
savebp = bp;
er->rxcs = rxaddr->rxcs;
er->rxdb = rxaddr->rxdb;
bp = &erxbuf[unit];
bp->b_un.b_addr = (caddr_t)er->rxxt;
bp->b_bcount = sizeof (er->rxxt);
bp->b_flags &= ~(B_DIRTY|B_UAREA|B_PHYS|B_PAGET);
if (dp->b_actf == NULL)
dp->b_actl = bp;
bp->b_forw = dp->b_actf;
dp->b_actf = bp;
rxc->rxc_state = RXS_RDERR;
um->um_cmd = RX_RDERR;
(void) ubago(ui);
return;
done:
ubadone(um);
rdone:
um->um_tab.b_active = 0;
um->um_tab.b_errcnt = 0;
if ((sc->sc_resid -= NBPS) > 0) {
bp->b_un.b_addr += NBPS;
rxstart(um);
return;
}
bp->b_un.b_addr = sc->sc_uaddr;
bp->b_resid = 0;
bp->b_bcount = sc->sc_bcnt;
dp->b_actf = bp->av_forw;
iodone(bp);
sc->sc_offset = 0;
rxc->rxc_state = RXS_IDLE;
um->um_tab.b_actf = dp->b_forw;
dp->b_active = 0;
dp->b_errcnt = 0;
#ifdef RXDEBUG
printf(".. bp=%x, new=%x\n", bp, dp->b_actf);
#endif
/*
* If this unit has more work to do,
* start it up right away
*/
if (dp->b_actf)
rxustart(ui);
rxstart(um);
}
/*ARGSUSED*/
rxwatch()
{
register struct uba_device *ui;
register struct uba_ctlr *um;
register struct rx_softc *sc;
struct rx_ctlr *rxc;
int i, dopen = 0;
for (i=0; i<NRX; i++) {
ui = rxdinfo[i];
if (ui == 0 || ui->ui_alive == 0)
continue;
sc = &rx_softc[i];
if ((sc->sc_open == 0) && (rxutab[i].b_active == 0)) {
sc->sc_csbits = 0;
continue;
}
dopen++;
um = ui->ui_mi;
rxc = &rx_ctlr[um->um_ctlr];
if (++rxc->rxc_tocnt >= RX_MAXTIMEOUT) {
rxc->rxc_tocnt = 0;
if (um->um_tab.b_active) {
printf("rx%d: timeout\n", i);/* for debugging */
rxintr(um->um_ctlr);
}
}
}
if (dopen)
timeout(rxwatch, (caddr_t)0, hz);
else
rxwstart = 0;
}
rxreset(uban)
int uban;
{
register struct uba_ctlr *um;
register struct rxdevice *rxaddr;
register int ctlr;
for (ctlr = 0; ctlr < NFX; ctlr++) {
if ((um = rxminfo[ctlr]) == 0 || um->um_ubanum != uban ||
um->um_alive == 0)
continue;
printf(" fx%d", ctlr);
if (um->um_ubinfo) {
printf("<%d>", UBAI_BDP(um->um_ubinfo));
um->um_ubinfo = 0;
}
rx_ctlr[ctlr].rxc_state = RXS_IDLE;
rxaddr = (struct rxdevice *)um->um_addr;
rxaddr->rxcs = RX_INIT;
while ((rxaddr->rxcs&RX_DONE) == 0)
;
rxstart(um);
}
}
rxread(dev, uio)
dev_t dev;
struct uio *uio;
{
int unit = RXUNIT(dev);
struct rx_softc *sc = &rx_softc[unit];
if (uio->uio_offset + uio->uio_resid > RXSIZE)
return (ENXIO);
if (uio->uio_offset < 0 || (uio->uio_offset & SECMASK) != 0)
return (ENXIO);
sc->sc_offset = uio->uio_offset % DEV_BSIZE;
return (physio(rxstrategy, &rrxbuf[unit], dev, B_READ, minphys, uio));
}
rxwrite(dev, uio)
dev_t dev;
struct uio *uio;
{
int unit = RXUNIT(dev);
struct rx_softc *sc = &rx_softc[unit];
if (uio->uio_offset + uio->uio_resid > RXSIZE)
return (ENXIO);
if (uio->uio_offset < 0 || (uio->uio_offset & SECMASK) != 0)
return (ENXIO);
sc->sc_offset = uio->uio_offset % DEV_BSIZE;
return(physio(rxstrategy, &rrxbuf[unit], dev, B_WRITE, minphys, uio));
}
/*
* Control routine:
* processes four kinds of requests:
*
* (1) Set density (i.e., format the diskette) according to
* that specified data parameter
* (2) Arrange for the next sector to be written with a deleted-
* data mark.
* (3) Report whether the last sector read had a deleted-data mark
* (4) Report the density of the diskette in the indicated drive
* (since the density it automatically determined by the driver,
* this is the only way to let an application program know the
* density)
*
* Requests relating to deleted-data marks can be handled right here.
* A "set density" (format) request, however, must additionally be
* processed through "rxstart", just like a read or write request.
*/
/*ARGSUSED3*/
rxioctl(dev, cmd, data, flag)
dev_t dev;
caddr_t data;
{
int unit = RXUNIT(dev);
struct rx_softc *sc = &rx_softc[unit];
switch (cmd) {
case RXIOC_FORMAT:
if ((flag&FWRITE) == 0)
return (EBADF);
if (sc->sc_open > 1)
return (EBUSY);
if (*(int *)data)
sc->sc_csbits |= RX_DDEN;
else
sc->sc_csbits &= ~RX_DDEN;
return (rxformat(dev));
case RXIOC_WDDS:
sc->sc_flags |= RXF_USEWDDS;
return (0);
case RXIOC_RDDSMK:
*(int *)data = sc->sc_flags & RXF_DDMK;
return (0);
case RXIOC_GDENS:
*(int *)data = sc->sc_csbits & RX_DDEN;
return (0);
}
return (ENXIO);
}
/*
* Initiate a format command.
*/
rxformat(dev)
dev_t dev;
{
int unit = RXUNIT(dev);
struct buf *bp;
struct rx_softc *sc = &rx_softc[unit];
int error = 0;
bp = &rrxbuf[unit];
bp->b_flags = B_BUSY | B_CTRL;
sc->sc_flags = RXF_FORMAT | RXF_LOCK;
bp->b_dev = dev;
bp->b_error = 0;
bp->b_blkno = 0;
rxstrategy(bp);
iowait(bp);
if (bp->b_flags & B_ERROR)
error = bp->b_error;
bp->b_flags &= ~B_BUSY;
sc->sc_flags &= ~RXF_LOCK;
return (error);
}
/*
* A permanent hard error condition has occured,
* purge the buffer queue
*/
rxpurge(um)
register struct uba_ctlr *um;
{
register struct buf *bp, *dp;
dp = um->um_tab.b_actf;
while (dp->b_actf) {
dp->b_errcnt++;
bp = dp->b_actf;
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
iodone(bp);
dp->b_actf = bp->av_forw;
}
}
#endif
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.