[unix-history] / a / sys / vaxmba / mt.c

/*	mt.c	4.15	82/12/17	*/

#include "mu.h"
#if NMT > 0
/*
 * TM78/TU78 tape driver
 *
 *	Behavior in complex error situations is uncertain...
 *
 * TODO:
 *	test error recovery
 *	add odd byte count kludge from VMS driver
 *	write dump routine
 */
#include "../machine/pte.h"

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/buf.h"
#include "../h/conf.h"
#include "../h/dir.h"
#include "../h/file.h"
#include "../h/user.h"
#include "../h/map.h"
#include "../h/ioctl.h"
#include "../h/mtio.h"
#include "../h/cmap.h"
#include "../h/uio.h"

#include "../vax/cpu.h"
#include "../vaxmba/mbareg.h"
#include "../vaxmba/mbavar.h"
#include "../vaxmba/mtreg.h"

struct	buf	rmtbuf[NMT];
struct	buf	cmtbuf[NMT];

short	mttypes[] =
	{ MBDT_TU78, 0 };
struct	mba_device *mtinfo[NMT];
int	mtattach(), mtslave(), mtustart(), mtstart(), mtndtint(), mtdtint();
struct	mba_driver mtdriver =
    { mtattach, mtslave, mtustart, mtstart, mtdtint, mtndtint,
      mttypes, "mt", "mu", mtinfo };

#define MASKREG(r)	((r) & 0xffff)

/* bits in minor device */
#define	MUUNIT(dev)	(minor(dev)&03)
#define	H_NOREWIND	04
#define	H_6250BPI	08

#define MTUNIT(dev)	(mutomt[MUUNIT(dev)])

#define	INF	(daddr_t)1000000L	/* a block number that wont exist */

struct	mu_softc {
	char	sc_openf;
	char	sc_flags;
	daddr_t	sc_blkno;
	daddr_t	sc_nxrec;
	u_short	sc_erreg;
	u_short	sc_dsreg;
	short	sc_resid;
	short	sc_dens;
	struct	mba_device *sc_mi;
	int	sc_slave;
} mu_softc[NMU];
short	mutomt[NMU];

/*
 * Bits for sc_flags.
 */
#define	H_WRITTEN 1	/* last operation was a write */

char	mtds_bits[] = MTDS_BITS;

/*ARGSUSED*/
mtattach(mi)
	struct mba_device *mi;
{

}

mtslave(mi, ms, sn)
	struct mba_device *mi;
	struct mba_slave *ms;
	int sn;
{
	register struct mu_softc *sc = &mu_softc[ms->ms_unit];
	register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv;
	int s = spl7(), rtn = 0;

	mtaddr->mtas = -1;
	mtaddr->mtncs[sn] = MT_SENSE|MT_GO;
	while (mtaddr->mtas == 0)
		;
	if ((mtaddr->mtner & MTER_INTCODE) == MTER_DONE &&
	    (mtaddr->mtds & MTDS_PRES)) {
		sc->sc_mi = mi;
		sc->sc_slave = sn;
		mutomt[ms->ms_unit] = mi->mi_unit;
		rtn = 1;
	}
	mtaddr->mtas = mtaddr->mtas;
	splx(s);
	return (rtn);
}

mtopen(dev, flag)
	dev_t dev;
	int flag;
{
	register int muunit;
	register struct mba_device *mi;
	register struct mu_softc *sc;
	int olddens, dens;

	muunit = MUUNIT(dev);
	if (muunit >= NMU || (sc = &mu_softc[muunit])->sc_openf ||
	    (mi = mtinfo[MTUNIT(dev)]) == 0 || mi->mi_alive == 0)
		return (ENXIO);
	olddens = sc->sc_dens;
	dens = sc->sc_dens = (minor(dev)&H_6250BPI) ? MT_GCR : 0;
	mtcommand(dev, MT_SENSE, 1);
	sc->sc_dens = olddens;
	if ((sc->sc_dsreg & MTDS_ONL) == 0) {
		uprintf("mu%d: not online\n", muunit);
		return (EIO);
	}
	if ((flag&FWRITE) && (sc->sc_dsreg&MTDS_FPT)) {
		uprintf("mu%d: no write ring\n", muunit);
		return (EIO);
	}
	if ((sc->sc_dsreg & MTDS_BOT) == 0 && (flag&FWRITE) &&
	    dens != sc->sc_dens) {
		uprintf("mu%d: can't change density in mid-tape\n", muunit);
		return (EIO);
	}
	sc->sc_openf = 1;
	sc->sc_blkno = (daddr_t)0;
	sc->sc_nxrec = INF;
	sc->sc_flags = 0;
	sc->sc_dens = dens;
	return (0);
}

mtclose(dev, flag)
	register dev_t dev;
	register flag;
{
	register struct mu_softc *sc = &mu_softc[MUUNIT(dev)];

	if (flag == FWRITE || ((flag&FWRITE) && (sc->sc_flags&H_WRITTEN)))
		mtcommand(dev, MT_CLS|sc->sc_dens, 1);
	if ((minor(dev)&H_NOREWIND) == 0)
		mtcommand(dev, MT_REW, 0);
	sc->sc_openf = 0;
}

mtcommand(dev, com, count)
	dev_t dev;
	int com, count;
{
	register struct buf *bp;
	register int s;

	bp = &cmtbuf[MTUNIT(dev)];
	s = spl5();
	while (bp->b_flags&B_BUSY) {
		if(bp->b_repcnt == 0 && (bp->b_flags&B_DONE))
			break;
		bp->b_flags |= B_WANTED;
		sleep((caddr_t)bp, PRIBIO);
	}
	bp->b_flags = B_BUSY|B_READ;
	splx(s);
	bp->b_dev = dev;
	bp->b_command = com;
	bp->b_repcnt = count;
	bp->b_blkno = 0;
	mtstrategy(bp);
	if (count == 0)
		return;
	iowait(bp);
	if (bp->b_flags&B_WANTED)
		wakeup((caddr_t)bp);
	bp->b_flags &= B_ERROR;
}

mtstrategy(bp)
	register struct buf *bp;
{
	register struct mba_device *mi = mtinfo[MTUNIT(bp->b_dev)];
	register struct buf *dp;
	register int s;

	bp->av_forw = NULL;
	dp = &mi->mi_tab;
	s = spl5();
	if (dp->b_actf == NULL)
		dp->b_actf = bp;
	else
		dp->b_actl->av_forw = bp;
	dp->b_actl = bp;
	if (dp->b_active == 0)
		mbustart(mi);
	splx(s);
}

mtustart(mi)
	register struct mba_device *mi;
{
	register struct mtdevice *mtaddr =
	    (struct mtdevice *)mi->mi_drv;
	register struct buf *bp = mi->mi_tab.b_actf;
	register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)];
	daddr_t blkno;

	sc->sc_flags &= ~H_WRITTEN;
	if (sc->sc_openf < 0) {
		bp->b_flags |= B_ERROR;
		return (MBU_NEXT);
	}
	if (bp != &cmtbuf[MTUNIT(bp->b_dev)]) {
		if (bdbtofsb(bp->b_blkno) > sc->sc_nxrec) {
			bp->b_flags |= B_ERROR;
			bp->b_error = ENXIO;
			return (MBU_NEXT);
		}
		if (bdbtofsb(bp->b_blkno) == sc->sc_nxrec &&
		    bp->b_flags&B_READ) {
			bp->b_resid = bp->b_bcount;
			clrbuf(bp);
			return (MBU_NEXT);
		}
		if ((bp->b_flags&B_READ)==0)
			sc->sc_nxrec = bdbtofsb(bp->b_blkno) + 1;
	} else {
		mtaddr->mtncs[MUUNIT(bp->b_dev)] =
			(bp->b_repcnt<<8)|bp->b_command|MT_GO;
		return (MBU_STARTED);
	}
	if ((blkno = sc->sc_blkno) == bdbtofsb(bp->b_blkno)) {
		if (mi->mi_tab.b_errcnt == 2) {
			mtaddr->mtca = MUUNIT(bp->b_dev);
		} else {
			mtaddr->mtbc = bp->b_bcount;
			mtaddr->mtca = (1<<2)|MUUNIT(bp->b_dev);
		}
		return (MBU_DODATA);
	}
	if (blkno < bdbtofsb(bp->b_blkno))
		mtaddr->mtncs[MUUNIT(bp->b_dev)] =
		  (min((unsigned)(bdbtofsb(bp->b_blkno) - blkno), 0377) << 8) |
			MT_SFORW|MT_GO;
	else
		mtaddr->mtncs[MUUNIT(bp->b_dev)] =
		  (min((unsigned)(blkno - bdbtofsb(bp->b_blkno)), 0377) << 8) |
			MT_SREV|MT_GO;
	return (MBU_STARTED);
}

mtstart(mi)
	register struct mba_device *mi;
{
	register struct buf *bp = mi->mi_tab.b_actf;
	register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)];

	if (bp->b_flags & B_READ)
		if (mi->mi_tab.b_errcnt == 2)
			return(MT_READREV|MT_GO);
		else
			return(MT_READ|MT_GO);
	else
		return(MT_WRITE|sc->sc_dens|MT_GO);
}

mtdtint(mi, mbsr)
	register struct mba_device *mi;
	int mbsr;
{
	register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv;
	register struct buf *bp = mi->mi_tab.b_actf;
	register struct mu_softc *sc;

	/* I'M NOT SURE IF THIS SHOULD ALWAYS BE THE CASE SO FOR NOW... */
	if ((mtaddr->mtca&3) != MUUNIT(bp->b_dev)) {
		printf("mt: wrong unit!\n");
		mtaddr->mtca = MUUNIT(bp->b_dev);
	}
	sc = &mu_softc[MUUNIT(bp->b_dev)];
	sc->sc_erreg = mtaddr->mter;
	if((bp->b_flags & B_READ) == 0)
		sc->sc_flags |= H_WRITTEN;
	switch (sc->sc_erreg & MTER_INTCODE) {
	case MTER_DONE:
	case MTER_LONGREC:
		if (mi->mi_tab.b_errcnt != 2)
			sc->sc_blkno++;
		bp->b_resid = 0;
		break;

	case MTER_NOTCAP:
		printf("mu%d: blank tape\n", MUUNIT(bp->b_dev));
		goto err;

	case MTER_TM:
	case MTER_EOT:
		sc->sc_blkno++;
	err:
		bp->b_resid = bp->b_bcount;
		sc->sc_nxrec = bdbtofsb(bp->b_blkno);
		break;

	case MTER_SHRTREC:
		sc->sc_blkno++;
		if (bp != &rmtbuf[MTUNIT(bp->b_dev)])
			bp->b_flags |= B_ERROR;
		if (mi->mi_tab.b_errcnt == 2)
			bp->b_bcount = bp->b_resid;	/* restore saved value */
		bp->b_resid = bp->b_bcount - mtaddr->mtbc;
		break;

	case MTER_RDOPP:
		mi->mi_tab.b_errcnt = 2;	/* indicate "read opposite" */
		bp->b_resid = bp->b_bcount;	/* save it */
		bp->b_bcount = mtaddr->mtbc;	/* use this instead */
		return(MBD_RETRY);

	case MTER_RETRY:
		mi->mi_tab.b_errcnt = 1;	/* indicate simple retry */
		return(MBD_RETRY);

	case MTER_OFFLINE:
		if (sc->sc_openf > 0) {
			sc->sc_openf = -1;
			printf("mu%d: offline\n", MUUNIT(bp->b_dev));
		}
		bp->b_flags |= B_ERROR;
		break;

	case MTER_FPT:
		printf("mu%d: no write ring\n", MUUNIT(bp->b_dev));
		bp->b_flags |= B_ERROR;
		break;

	default:
		printf("mu%d: hard error bn%d mbsr=%b er=%x ds=%b\n",
		    MUUNIT(bp->b_dev), bp->b_blkno,
		    mbsr, mbsr_bits, sc->sc_erreg,
		    sc->sc_dsreg, mtds_bits);
		bp->b_flags |= B_ERROR;
		mtaddr->mtid = MTID_CLR;		/* reset the TM78 */
		DELAY(250);
		while ((mtaddr->mtid & MTID_RDY) == 0)	/* wait for it */
			;
		return (MBD_DONE);
	}
	/* CHECK FOR MBA ERROR WHEN NO OTHER ERROR INDICATED? */
	return (MBD_DONE);
}

mtndtint(mi)
	register struct mba_device *mi;
{
	register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv;
	register struct buf *bp = mi->mi_tab.b_actf;
	register struct mu_softc *sc;
	int er, fc, unit;

	unit = (mtaddr->mtner >> 8) & 3;
	er = MASKREG(mtaddr->mtner);
	/* WILL THIS OCCUR IF ANOTHER DRIVE COMES ONLINE? */
	if (bp == 0 || unit != MUUNIT(bp->b_dev)) {	/* consistency check */
		if ((er & MTER_INTCODE) != MTER_ONLINE)
			printf("mt: unit %d random interrupt\n", unit);
		return (MBN_SKIP);
	}
	if (bp == 0)
		return (MBN_SKIP);
	fc = (mtaddr->mtncs[unit] >> 8) & 0xff;
	sc = &mu_softc[unit];
	sc->sc_erreg = er;
	sc->sc_resid = fc;
	switch (er & MTER_INTCODE) {
	case MTER_DONE:
		if (bp == &cmtbuf[MTUNIT(bp->b_dev)]) {
	done:
			if (bp->b_command == MT_SENSE)
				sc->sc_dsreg = MASKREG(mtaddr->mtds);
			bp->b_resid = fc;
			return (MBN_DONE);
		}
		/* this is UGLY!  (but is it correct?) */
		if ((fc = bdbtofsb(bp->b_blkno) - sc->sc_blkno) < 0)
			sc->sc_blkno -= MIN(0377, -fc);
		else
			sc->sc_blkno += MIN(0377, fc);
		return (MBN_RETRY);

	case MTER_RWDING:
		return (MBN_SKIP);	/* ignore "rewind started" interrupt */

	case MTER_NOTCAP:
		printf("mu%d: blank tape\n", MUUNIT(bp->b_dev));

	case MTER_TM:
	case MTER_EOT:
	case MTER_LEOT:
		if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) {
			sc->sc_nxrec = bdbtofsb(bp->b_blkno) + fc;
			sc->sc_blkno = sc->sc_nxrec;
		} else {
			sc->sc_blkno = bdbtofsb(bp->b_blkno) - fc;
			sc->sc_nxrec = sc->sc_blkno - 1;
		}
		return (MBN_RETRY);

	case MTER_FPT:
		printf("mu%d: no write ring\n", MUUNIT(bp->b_dev));
		bp->b_flags |= B_ERROR;
		return (MBN_DONE);

	case MTER_OFFLINE:
		if (sc->sc_openf > 0) {
			sc->sc_openf = -1;
			printf("mu%d: offline\n", MUUNIT(bp->b_dev));
		}
		bp->b_flags |= B_ERROR;
		return (MBN_DONE);

	case MTER_BOT:
		if (bp == &cmtbuf[MTUNIT(bp->b_dev)])
			goto done;
		/* FALL THROUGH */

	default:
		printf("mu%d: hard error bn%d er=%o ds=%b\n",
		    MUUNIT(bp->b_dev), bp->b_blkno,
		    sc->sc_erreg, sc->sc_dsreg, mtds_bits);
		mtaddr->mtid = MTID_CLR;		/* reset the TM78 */
		DELAY(250);
		while ((mtaddr->mtid & MTID_RDY) == 0)	/* wait for it */
			;
		bp->b_flags |= B_ERROR;
		return (MBN_DONE);
	}
	/* NOTREACHED */
}

mtread(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	int errno;

	errno = mtphys(dev, uio);
	if (errno)
		return (errno);
	return (physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_READ, minphys, uio));
}

mtwrite(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	int errno;

	errno = mtphys(dev, uio);
	if (errno)
		return (errno);
	return (physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_WRITE, minphys, uio));
}

mtphys(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	register int mtunit;
	register struct mu_softc *sc;
	register struct mba_device *mi;
	daddr_t a;

	mtunit = MTUNIT(dev);
	if (mtunit >= NMT || (mi = mtinfo[mtunit]) == 0 || mi->mi_alive == 0)
		return (ENXIO);
	a = uio->uio_offset >> 9;
	sc = &mu_softc[MUUNIT(dev)];
	sc->sc_blkno = bdbtofsb(a);
	sc->sc_nxrec = bdbtofsb(a)+1;
	return (0);
}

/*ARGSUSED*/
mtioctl(dev, cmd, data, flag)
	dev_t dev;
	int cmd;
	caddr_t data;
	int flag;
{
	register struct mu_softc *sc = &mu_softc[MUUNIT(dev)];
	register struct buf *bp = &cmtbuf[MTUNIT(dev)];
	register callcount;
	register int op;
	int fcount;
	struct mtop *mtop;
	struct mtget *mtget;
	/* we depend of the values and order of the MT codes here */
	static mtops[] =
	{MT_WTM,MT_SFORWF,MT_SREVF,MT_SFORW,MT_SREV,MT_REW,MT_UNLOAD,MT_SENSE};

	switch (cmd) {

	case MTIOCTOP:	/* tape operation */
		mtop = (struct mtop *)data;
		switch (mtop->mt_op) {

		case MTWEOF:
			callcount = mtop->mt_count;
			fcount = 1;
			break;

		case MTFSF: case MTBSF:
			callcount = mtop->mt_count;
			fcount = 1;
			break;

		case MTFSR: case MTBSR:
			callcount = 1;
			fcount = mtop->mt_count;
			break;

		case MTREW: case MTOFFL:
			callcount = 1;
			fcount = 1;
			break;

		default:
			return (ENXIO);
		}
		if (callcount <= 0 || fcount <= 0)
			return (EINVAL);
		op = mtops[mtop->mt_op];
		if (op == MT_WTM)
			op |= sc->sc_dens;
		while (--callcount >= 0) {
			register int n;

			do {
				n = MIN(fcount, 0xff);
				mtcommand(dev, op, n);
				fcount -= n;
			} while (fcount);
			if ((mtop->mt_op == MTFSR || mtop->mt_op == MTBSR) &&
			    bp->b_resid)
				return (EIO);
			if (bp->b_flags&B_ERROR)
				break;
		}
		return (geterror(bp));

	case MTIOCGET:
		mtget = (struct mtget *)data;
		mtget->mt_erreg = sc->sc_erreg;
		mtget->mt_resid = sc->sc_resid;
		mtcommand(dev, MT_SENSE, 1);	/* update drive status */
		mtget->mt_dsreg = sc->sc_dsreg;
		mtget->mt_type = MT_ISMT;
		break;

	default:
		return (ENXIO);
	}
	return (0);
}

#define	DBSIZE	20

mtdump()
{
	register struct mba_device *mi;
	register struct mba_regs *mp;
	int blk, num;
	int start;

	start = 0;
	num = maxfree;
#define	phys(a,b)		((b)((int)(a)&0x7fffffff))
	if (mtinfo[0] == 0)
		return (ENXIO);
	mi = phys(mtinfo[0], struct mba_device *);
	mp = phys(mi->mi_hd, struct mba_hd *)->mh_physmba;
	mp->mba_cr = MBCR_IE;
#if lint
	blk = 0; num = blk; start = num; blk = start;
	return (0);
#endif
#ifdef notyet
	mtaddr = (struct mtdevice *)&mp->mba_drv[mi->mi_drive];
	mtaddr->mttc = MTTC_PDP11|MTTC_1600BPI;
	mtaddr->mtcs1 = MT_DCLR|MT_GO;
	while (num > 0) {
		blk = num > DBSIZE ? DBSIZE : num;
		mtdwrite(start, blk, mtaddr, mp);
		start += blk;
		num -= blk;
	}
	mteof(mtaddr);
	mteof(mtaddr);
	mtwait(mtaddr);
	if (mtaddr->mtds&MTDS_ERR)
		return (EIO);
	mtaddr->mtcs1 = MT_REW|MT_GO;
	return (0);
}

mtdwrite(dbuf, num, mtaddr, mp)
	register dbuf, num;
	register struct mtdevice *mtaddr;
	struct mba_regs *mp;
{
	register struct pte *io;
	register int i;

	mtwait(mtaddr);
	io = mp->mba_map;
	for (i = 0; i < num; i++)
		*(int *)io++ = dbuf++ | PG_V;
	mtaddr->mtfc = -(num*NBPG);
	mp->mba_sr = -1;
	mp->mba_bcr = -(num*NBPG);
	mp->mba_var = 0;
	mtaddr->mtcs1 = MT_WCOM|MT_GO;
}

mtwait(mtaddr)
	struct mtdevice *mtaddr;
{
	register s;

	do
		s = mtaddr->mtds;
	while ((s & MTDS_DRY) == 0);
}

mteof(mtaddr)
	struct mtdevice *mtaddr;
{

	mtwait(mtaddr);
	mtaddr->mtcs1 = MT_WEOF|MT_GO;
#endif notyet
}
#endif
Commit	Line	Data
85888457 C	1	/* mt.c 4.15 82/12/17 */
	2
	3	#include "mu.h"
	4	#if NMT > 0
	5	/*
	6	* TM78/TU78 tape driver
	7	*
	8	* Behavior in complex error situations is uncertain...
	9	*
	10	* TODO:
	11	* test error recovery
	12	* add odd byte count kludge from VMS driver
	13	* write dump routine
	14	*/
	15	#include "../machine/pte.h"
	16
	17	#include "../h/param.h"
	18	#include "../h/systm.h"
	19	#include "../h/buf.h"
	20	#include "../h/conf.h"
	21	#include "../h/dir.h"
	22	#include "../h/file.h"
	23	#include "../h/user.h"
	24	#include "../h/map.h"
	25	#include "../h/ioctl.h"
	26	#include "../h/mtio.h"
	27	#include "../h/cmap.h"
	28	#include "../h/uio.h"
	29
	30	#include "../vax/cpu.h"
	31	#include "../vaxmba/mbareg.h"
	32	#include "../vaxmba/mbavar.h"
	33	#include "../vaxmba/mtreg.h"
	34
	35	struct buf rmtbuf[NMT];
	36	struct buf cmtbuf[NMT];
	37
	38	short mttypes[] =
	39	{ MBDT_TU78, 0 };
	40	struct mba_device *mtinfo[NMT];
	41	int mtattach(), mtslave(), mtustart(), mtstart(), mtndtint(), mtdtint();
	42	struct mba_driver mtdriver =
	43	{ mtattach, mtslave, mtustart, mtstart, mtdtint, mtndtint,
	44	mttypes, "mt", "mu", mtinfo };
	45
	46	#define MASKREG(r) ((r) & 0xffff)
	47
	48	/* bits in minor device */
	49	#define MUUNIT(dev) (minor(dev)&03)
	50	#define H_NOREWIND 04
	51	#define H_6250BPI 08
	52
	53	#define MTUNIT(dev) (mutomt[MUUNIT(dev)])
	54
	55	#define INF (daddr_t)1000000L /* a block number that wont exist */
	56
	57	struct mu_softc {
	58	char sc_openf;
	59	char sc_flags;
	60	daddr_t sc_blkno;
	61	daddr_t sc_nxrec;
	62	u_short sc_erreg;
	63	u_short sc_dsreg;
	64	short sc_resid;
65	short sc_dens;
66	struct mba_device *sc_mi;
67	int sc_slave;
68	} mu_softc[NMU];
69	short mutomt[NMU];
70
71	/*
72	* Bits for sc_flags.
73	*/
74	#define H_WRITTEN 1 /* last operation was a write */
75
76	char mtds_bits[] = MTDS_BITS;
77
78	/ARGSUSED/
79	mtattach(mi)
80	struct mba_device *mi;
81	{
82
83	}
84
85	mtslave(mi, ms, sn)
86	struct mba_device *mi;
87	struct mba_slave *ms;
88	int sn;
89	{
90	register struct mu_softc *sc = &mu_softc[ms->ms_unit];
91	register struct mtdevice mtaddr = (struct mtdevice )mi->mi_drv;
92	int s = spl7(), rtn = 0;
93
94	mtaddr->mtas = -1;
95	mtaddr->mtncs[sn] = MT_SENSE\|MT_GO;
96	while (mtaddr->mtas == 0)
97	;
98	if ((mtaddr->mtner & MTER_INTCODE) == MTER_DONE &&
99	(mtaddr->mtds & MTDS_PRES)) {
100	sc->sc_mi = mi;
101	sc->sc_slave = sn;
102	mutomt[ms->ms_unit] = mi->mi_unit;
103	rtn = 1;
104	}
105	mtaddr->mtas = mtaddr->mtas;
106	splx(s);
107	return (rtn);
108	}
109
110	mtopen(dev, flag)
111	dev_t dev;
112	int flag;
113	{
114	register int muunit;
115	register struct mba_device *mi;
116	register struct mu_softc *sc;
117	int olddens, dens;
118
119	muunit = MUUNIT(dev);
120	if (muunit >= NMU \|\| (sc = &mu_softc[muunit])->sc_openf \|\|
121	(mi = mtinfo[MTUNIT(dev)]) == 0 \|\| mi->mi_alive == 0)
122	return (ENXIO);
123	olddens = sc->sc_dens;
124	dens = sc->sc_dens = (minor(dev)&H_6250BPI) ? MT_GCR : 0;
125	mtcommand(dev, MT_SENSE, 1);
126	sc->sc_dens = olddens;
127	if ((sc->sc_dsreg & MTDS_ONL) == 0) {
128	uprintf("mu%d: not online\n", muunit);
129	return (EIO);
130	}
131	if ((flag&FWRITE) && (sc->sc_dsreg&MTDS_FPT)) {
132	uprintf("mu%d: no write ring\n", muunit);
133	return (EIO);
134	}
135	if ((sc->sc_dsreg & MTDS_BOT) == 0 && (flag&FWRITE) &&
136	dens != sc->sc_dens) {
137	uprintf("mu%d: can't change density in mid-tape\n", muunit);
138	return (EIO);
139	}
140	sc->sc_openf = 1;
141	sc->sc_blkno = (daddr_t)0;
142	sc->sc_nxrec = INF;
143	sc->sc_flags = 0;
144	sc->sc_dens = dens;
145	return (0);
146	}
147
148	mtclose(dev, flag)
149	register dev_t dev;
150	register flag;
151	{
152	register struct mu_softc *sc = &mu_softc[MUUNIT(dev)];
153
154	if (flag == FWRITE \|\| ((flag&FWRITE) && (sc->sc_flags&H_WRITTEN)))
155	mtcommand(dev, MT_CLS\|sc->sc_dens, 1);
156	if ((minor(dev)&H_NOREWIND) == 0)
157	mtcommand(dev, MT_REW, 0);
158	sc->sc_openf = 0;
159	}
160
161	mtcommand(dev, com, count)
162	dev_t dev;
163	int com, count;
164	{
165	register struct buf *bp;
166	register int s;
167
168	bp = &cmtbuf[MTUNIT(dev)];
169	s = spl5();
170	while (bp->b_flags&B_BUSY) {
171	if(bp->b_repcnt == 0 && (bp->b_flags&B_DONE))
172	break;
173	bp->b_flags \|= B_WANTED;
174	sleep((caddr_t)bp, PRIBIO);
175	}
176	bp->b_flags = B_BUSY\|B_READ;
177	splx(s);
178	bp->b_dev = dev;
179	bp->b_command = com;
180	bp->b_repcnt = count;
181	bp->b_blkno = 0;
182	mtstrategy(bp);
183	if (count == 0)
184	return;
185	iowait(bp);
186	if (bp->b_flags&B_WANTED)
187	wakeup((caddr_t)bp);
188	bp->b_flags &= B_ERROR;
189	}
190
191	mtstrategy(bp)
192	register struct buf *bp;
193	{
194	register struct mba_device *mi = mtinfo[MTUNIT(bp->b_dev)];
195	register struct buf *dp;
196	register int s;
197
198	bp->av_forw = NULL;
199	dp = &mi->mi_tab;
200	s = spl5();
201	if (dp->b_actf == NULL)
202	dp->b_actf = bp;
203	else
204	dp->b_actl->av_forw = bp;
205	dp->b_actl = bp;
206	if (dp->b_active == 0)
207	mbustart(mi);
208	splx(s);
209	}
210
211	mtustart(mi)
212	register struct mba_device *mi;
213	{
214	register struct mtdevice *mtaddr =
215	(struct mtdevice *)mi->mi_drv;
216	register struct buf *bp = mi->mi_tab.b_actf;
217	register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)];
218	daddr_t blkno;
219
220	sc->sc_flags &= ~H_WRITTEN;
221	if (sc->sc_openf < 0) {
222	bp->b_flags \|= B_ERROR;
223	return (MBU_NEXT);
224	}
225	if (bp != &cmtbuf[MTUNIT(bp->b_dev)]) {
226	if (bdbtofsb(bp->b_blkno) > sc->sc_nxrec) {
227	bp->b_flags \|= B_ERROR;
228	bp->b_error = ENXIO;
229	return (MBU_NEXT);
230	}
231	if (bdbtofsb(bp->b_blkno) == sc->sc_nxrec &&
232	bp->b_flags&B_READ) {
233	bp->b_resid = bp->b_bcount;
234	clrbuf(bp);
235	return (MBU_NEXT);
236	}
237	if ((bp->b_flags&B_READ)==0)
238	sc->sc_nxrec = bdbtofsb(bp->b_blkno) + 1;
239	} else {
240	mtaddr->mtncs[MUUNIT(bp->b_dev)] =
241	(bp->b_repcnt<<8)\|bp->b_command\|MT_GO;
242	return (MBU_STARTED);
243	}
244	if ((blkno = sc->sc_blkno) == bdbtofsb(bp->b_blkno)) {
245	if (mi->mi_tab.b_errcnt == 2) {
246	mtaddr->mtca = MUUNIT(bp->b_dev);
247	} else {
248	mtaddr->mtbc = bp->b_bcount;
249	mtaddr->mtca = (1<<2)\|MUUNIT(bp->b_dev);
250	}
251	return (MBU_DODATA);
252	}
253	if (blkno < bdbtofsb(bp->b_blkno))
254	mtaddr->mtncs[MUUNIT(bp->b_dev)] =
255	(min((unsigned)(bdbtofsb(bp->b_blkno) - blkno), 0377) << 8) \|
256	MT_SFORW\|MT_GO;
257	else
258	mtaddr->mtncs[MUUNIT(bp->b_dev)] =
259	(min((unsigned)(blkno - bdbtofsb(bp->b_blkno)), 0377) << 8) \|
260	MT_SREV\|MT_GO;
261	return (MBU_STARTED);
262	}
263
264	mtstart(mi)
265	register struct mba_device *mi;
266	{
267	register struct buf *bp = mi->mi_tab.b_actf;
268	register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)];
269
270	if (bp->b_flags & B_READ)
271	if (mi->mi_tab.b_errcnt == 2)
272	return(MT_READREV\|MT_GO);
273	else
274	return(MT_READ\|MT_GO);
275	else
276	return(MT_WRITE\|sc->sc_dens\|MT_GO);
277	}
278
279	mtdtint(mi, mbsr)
280	register struct mba_device *mi;
281	int mbsr;
282	{
283	register struct mtdevice mtaddr = (struct mtdevice )mi->mi_drv;
284	register struct buf *bp = mi->mi_tab.b_actf;
285	register struct mu_softc *sc;
286
287	/* I'M NOT SURE IF THIS SHOULD ALWAYS BE THE CASE SO FOR NOW... */
288	if ((mtaddr->mtca&3) != MUUNIT(bp->b_dev)) {
289	printf("mt: wrong unit!\n");
290	mtaddr->mtca = MUUNIT(bp->b_dev);
291	}
292	sc = &mu_softc[MUUNIT(bp->b_dev)];
293	sc->sc_erreg = mtaddr->mter;
294	if((bp->b_flags & B_READ) == 0)
295	sc->sc_flags \|= H_WRITTEN;
296	switch (sc->sc_erreg & MTER_INTCODE) {
297	case MTER_DONE:
298	case MTER_LONGREC:
299	if (mi->mi_tab.b_errcnt != 2)
300	sc->sc_blkno++;
301	bp->b_resid = 0;
302	break;
303
304	case MTER_NOTCAP:
305	printf("mu%d: blank tape\n", MUUNIT(bp->b_dev));
306	goto err;
307
308	case MTER_TM:
309	case MTER_EOT:
310	sc->sc_blkno++;
311	err:
312	bp->b_resid = bp->b_bcount;
313	sc->sc_nxrec = bdbtofsb(bp->b_blkno);
314	break;
315
316	case MTER_SHRTREC:
317	sc->sc_blkno++;
318	if (bp != &rmtbuf[MTUNIT(bp->b_dev)])
319	bp->b_flags \|= B_ERROR;
320	if (mi->mi_tab.b_errcnt == 2)
321	bp->b_bcount = bp->b_resid; /* restore saved value */
322	bp->b_resid = bp->b_bcount - mtaddr->mtbc;
323	break;
324
325	case MTER_RDOPP:
326	mi->mi_tab.b_errcnt = 2; /* indicate "read opposite" */
327	bp->b_resid = bp->b_bcount; /* save it */
328	bp->b_bcount = mtaddr->mtbc; /* use this instead */
329	return(MBD_RETRY);
330
331	case MTER_RETRY:
332	mi->mi_tab.b_errcnt = 1; /* indicate simple retry */
333	return(MBD_RETRY);
334
335	case MTER_OFFLINE:
336	if (sc->sc_openf > 0) {
337	sc->sc_openf = -1;
338	printf("mu%d: offline\n", MUUNIT(bp->b_dev));
339	}
340	bp->b_flags \|= B_ERROR;
341	break;
342
343	case MTER_FPT:
344	printf("mu%d: no write ring\n", MUUNIT(bp->b_dev));
345	bp->b_flags \|= B_ERROR;
346	break;
347
348	default:
349	printf("mu%d: hard error bn%d mbsr=%b er=%x ds=%b\n",
350	MUUNIT(bp->b_dev), bp->b_blkno,
351	mbsr, mbsr_bits, sc->sc_erreg,
352	sc->sc_dsreg, mtds_bits);
353	bp->b_flags \|= B_ERROR;
354	mtaddr->mtid = MTID_CLR; /* reset the TM78 */
355	DELAY(250);
356	while ((mtaddr->mtid & MTID_RDY) == 0) /* wait for it */
357	;
358	return (MBD_DONE);
359	}
360	/* CHECK FOR MBA ERROR WHEN NO OTHER ERROR INDICATED? */
361	return (MBD_DONE);
362	}
363
364	mtndtint(mi)
365	register struct mba_device *mi;
366	{
367	register struct mtdevice mtaddr = (struct mtdevice )mi->mi_drv;
368	register struct buf *bp = mi->mi_tab.b_actf;
369	register struct mu_softc *sc;
370	int er, fc, unit;
371
372	unit = (mtaddr->mtner >> 8) & 3;
373	er = MASKREG(mtaddr->mtner);
374	/* WILL THIS OCCUR IF ANOTHER DRIVE COMES ONLINE? */
375	if (bp == 0 \|\| unit != MUUNIT(bp->b_dev)) { /* consistency check */
376	if ((er & MTER_INTCODE) != MTER_ONLINE)
377	printf("mt: unit %d random interrupt\n", unit);
378	return (MBN_SKIP);
379	}
380	if (bp == 0)
381	return (MBN_SKIP);
382	fc = (mtaddr->mtncs[unit] >> 8) & 0xff;
383	sc = &mu_softc[unit];
384	sc->sc_erreg = er;
385	sc->sc_resid = fc;
386	switch (er & MTER_INTCODE) {
387	case MTER_DONE:
388	if (bp == &cmtbuf[MTUNIT(bp->b_dev)]) {
389	done:
390	if (bp->b_command == MT_SENSE)
391	sc->sc_dsreg = MASKREG(mtaddr->mtds);
392	bp->b_resid = fc;
393	return (MBN_DONE);
394	}
395	/* this is UGLY! (but is it correct?) */
396	if ((fc = bdbtofsb(bp->b_blkno) - sc->sc_blkno) < 0)
397	sc->sc_blkno -= MIN(0377, -fc);
398	else
399	sc->sc_blkno += MIN(0377, fc);
400	return (MBN_RETRY);
401
402	case MTER_RWDING:
403	return (MBN_SKIP); /* ignore "rewind started" interrupt */
404
405	case MTER_NOTCAP:
406	printf("mu%d: blank tape\n", MUUNIT(bp->b_dev));
407
408	case MTER_TM:
409	case MTER_EOT:
410	case MTER_LEOT:
411	if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) {
412	sc->sc_nxrec = bdbtofsb(bp->b_blkno) + fc;
413	sc->sc_blkno = sc->sc_nxrec;
414	} else {
415	sc->sc_blkno = bdbtofsb(bp->b_blkno) - fc;
416	sc->sc_nxrec = sc->sc_blkno - 1;
417	}
418	return (MBN_RETRY);
419
420	case MTER_FPT:
421	printf("mu%d: no write ring\n", MUUNIT(bp->b_dev));
422	bp->b_flags \|= B_ERROR;
423	return (MBN_DONE);
424
425	case MTER_OFFLINE:
426	if (sc->sc_openf > 0) {
427	sc->sc_openf = -1;
428	printf("mu%d: offline\n", MUUNIT(bp->b_dev));
429	}
430	bp->b_flags \|= B_ERROR;
431	return (MBN_DONE);
432
433	case MTER_BOT:
434	if (bp == &cmtbuf[MTUNIT(bp->b_dev)])
435	goto done;
436	/* FALL THROUGH */
437
438	default:
439	printf("mu%d: hard error bn%d er=%o ds=%b\n",
440	MUUNIT(bp->b_dev), bp->b_blkno,
441	sc->sc_erreg, sc->sc_dsreg, mtds_bits);
442	mtaddr->mtid = MTID_CLR; /* reset the TM78 */
443	DELAY(250);
444	while ((mtaddr->mtid & MTID_RDY) == 0) /* wait for it */
445	;
446	bp->b_flags \|= B_ERROR;
447	return (MBN_DONE);
448	}
449	/* NOTREACHED */
450	}
451
452	mtread(dev, uio)
453	dev_t dev;
454	struct uio *uio;
455	{
456	int errno;
457
458	errno = mtphys(dev, uio);
459	if (errno)
460	return (errno);
461	return (physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_READ, minphys, uio));
462	}
463
464	mtwrite(dev, uio)
465	dev_t dev;
466	struct uio *uio;
467	{
468	int errno;
469
470	errno = mtphys(dev, uio);
471	if (errno)
472	return (errno);
473	return (physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_WRITE, minphys, uio));
474	}
475
476	mtphys(dev, uio)
477	dev_t dev;
478	struct uio *uio;
479	{
480	register int mtunit;
481	register struct mu_softc *sc;
482	register struct mba_device *mi;
483	daddr_t a;
484
485	mtunit = MTUNIT(dev);
486	if (mtunit >= NMT \|\| (mi = mtinfo[mtunit]) == 0 \|\| mi->mi_alive == 0)
487	return (ENXIO);
488	a = uio->uio_offset >> 9;
489	sc = &mu_softc[MUUNIT(dev)];
490	sc->sc_blkno = bdbtofsb(a);
491	sc->sc_nxrec = bdbtofsb(a)+1;
492	return (0);
493	}
494
495	/ARGSUSED/
496	mtioctl(dev, cmd, data, flag)
497	dev_t dev;
498	int cmd;
499	caddr_t data;
500	int flag;
501	{
502	register struct mu_softc *sc = &mu_softc[MUUNIT(dev)];
503	register struct buf *bp = &cmtbuf[MTUNIT(dev)];
504	register callcount;
505	register int op;
506	int fcount;
507	struct mtop *mtop;
508	struct mtget *mtget;
509	/* we depend of the values and order of the MT codes here */
510	static mtops[] =
511	{MT_WTM,MT_SFORWF,MT_SREVF,MT_SFORW,MT_SREV,MT_REW,MT_UNLOAD,MT_SENSE};
512
513	switch (cmd) {
514
515	case MTIOCTOP: /* tape operation */
516	mtop = (struct mtop *)data;
517	switch (mtop->mt_op) {
518
519	case MTWEOF:
520	callcount = mtop->mt_count;
521	fcount = 1;
522	break;
523
524	case MTFSF: case MTBSF:
525	callcount = mtop->mt_count;
526	fcount = 1;
527	break;
528
529	case MTFSR: case MTBSR:
530	callcount = 1;
531	fcount = mtop->mt_count;
532	break;
533
534	case MTREW: case MTOFFL:
535	callcount = 1;
536	fcount = 1;
537	break;
538
539	default:
540	return (ENXIO);
541	}
542	if (callcount <= 0 \|\| fcount <= 0)
543	return (EINVAL);
544	op = mtops[mtop->mt_op];
545	if (op == MT_WTM)
546	op \|= sc->sc_dens;
547	while (--callcount >= 0) {
548	register int n;
549
550	do {
551	n = MIN(fcount, 0xff);
552	mtcommand(dev, op, n);
553	fcount -= n;
554	} while (fcount);
555	if ((mtop->mt_op == MTFSR \|\| mtop->mt_op == MTBSR) &&
556	bp->b_resid)
557	return (EIO);
558	if (bp->b_flags&B_ERROR)
559	break;
560	}
561	return (geterror(bp));
562
563	case MTIOCGET:
564	mtget = (struct mtget *)data;
565	mtget->mt_erreg = sc->sc_erreg;
566	mtget->mt_resid = sc->sc_resid;
567	mtcommand(dev, MT_SENSE, 1); /* update drive status */
568	mtget->mt_dsreg = sc->sc_dsreg;
569	mtget->mt_type = MT_ISMT;
570	break;
571
572	default:
573	return (ENXIO);
574	}
575	return (0);
576	}
577
578	#define DBSIZE 20
579
580	mtdump()
581	{
582	register struct mba_device *mi;
583	register struct mba_regs *mp;
584	int blk, num;
585	int start;
586
587	start = 0;
588	num = maxfree;
589	#define phys(a,b) ((b)((int)(a)&0x7fffffff))
590	if (mtinfo[0] == 0)
591	return (ENXIO);
592	mi = phys(mtinfo[0], struct mba_device *);
593	mp = phys(mi->mi_hd, struct mba_hd *)->mh_physmba;
594	mp->mba_cr = MBCR_IE;
595	#if lint
596	blk = 0; num = blk; start = num; blk = start;
597	return (0);
598	#endif
599	#ifdef notyet
600	mtaddr = (struct mtdevice *)&mp->mba_drv[mi->mi_drive];
601	mtaddr->mttc = MTTC_PDP11\|MTTC_1600BPI;
602	mtaddr->mtcs1 = MT_DCLR\|MT_GO;
603	while (num > 0) {
604	blk = num > DBSIZE ? DBSIZE : num;
605	mtdwrite(start, blk, mtaddr, mp);
606	start += blk;
607	num -= blk;
608	}
609	mteof(mtaddr);
610	mteof(mtaddr);
611	mtwait(mtaddr);
612	if (mtaddr->mtds&MTDS_ERR)
613	return (EIO);
614	mtaddr->mtcs1 = MT_REW\|MT_GO;
615	return (0);
616	}
617
618	mtdwrite(dbuf, num, mtaddr, mp)
619	register dbuf, num;
620	register struct mtdevice *mtaddr;
621	struct mba_regs *mp;
622	{
623	register struct pte *io;
624	register int i;
625
626	mtwait(mtaddr);
627	io = mp->mba_map;
628	for (i = 0; i < num; i++)
629	(int )io++ = dbuf++ \| PG_V;
630	mtaddr->mtfc = -(num*NBPG);
631	mp->mba_sr = -1;
632	mp->mba_bcr = -(num*NBPG);
633	mp->mba_var = 0;
634	mtaddr->mtcs1 = MT_WCOM\|MT_GO;
635	}
636
637	mtwait(mtaddr)
638	struct mtdevice *mtaddr;
639	{
640	register s;
641
642	do
643	s = mtaddr->mtds;
644	while ((s & MTDS_DRY) == 0);
645	}
646
647	mteof(mtaddr)
648	struct mtdevice *mtaddr;
649	{
650
651	mtwait(mtaddr);
652	mtaddr->mtcs1 = MT_WEOF\|MT_GO;
653	#endif notyet
654	}
655	#endif