[unix-history] / usr / src / sys / vaxmba / ht.c

/*	ht.c	6.2	83/09/26	*/

#include "tu.h"
#if NHT > 0
/*
 * TM03/TU?? tape driver
 *
 * TODO:
 *	cleanup messages on errors
 *	test ioctl's
 *	see how many rewind interrups we get if we kick when not at BOT
 *	fixup rle error on block tape code
 */
#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/htreg.h"

struct	buf	rhtbuf[NHT];
struct	buf	chtbuf[NHT];

short	httypes[] =
	{ MBDT_TM03, MBDT_TE16, MBDT_TU45, MBDT_TU77, 0 };
struct	mba_device *htinfo[NHT];
int	htattach(), htslave(), htustart(), htndtint(), htdtint();
struct	mba_driver htdriver =
    { htattach, htslave, htustart, 0, htdtint, htndtint,
      httypes, "ht", "tu", htinfo };

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

/* bits in minor device */
#define	TUUNIT(dev)	(minor(dev)&03)
#define	H_NOREWIND	04
#define	H_1600BPI	08

#define HTUNIT(dev)	(tutoht[TUUNIT(dev)])

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

struct	tu_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;
} tu_softc[NTU];
short	tutoht[NTU];

/*
 * Bits for sc_flags.
 */
#define	H_WRITTEN 1	/* last operation was a write */
#define H_ERASED  2	/* last write retry was an erase gap */
#define H_REWIND  4	/* last unit start was a rewind */

char	hter_bits[] = HTER_BITS;
char	htds_bits[] = HTDS_BITS;

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

}

htslave(mi, ms, sn)
	struct mba_device *mi;
	struct mba_slave *ms;
	int sn;
{
	register struct tu_softc *sc = &tu_softc[ms->ms_unit];
	register struct htdevice *htaddr = (struct htdevice *)mi->mi_drv;

	htaddr->httc = sn;
	if (htaddr->htdt & HTDT_SPR) {
		sc->sc_mi = mi;
		sc->sc_slave = sn;
		tutoht[ms->ms_unit] = mi->mi_unit;
		return (1);
	} else
		return (0);
}

htopen(dev, flag)
	dev_t dev;
	int flag;
{
	register int tuunit;
	register struct mba_device *mi;
	register struct tu_softc *sc;
	int olddens, dens;

	tuunit = TUUNIT(dev);
	if (tuunit >= NTU || (sc = &tu_softc[tuunit])->sc_openf ||
	    (mi = htinfo[HTUNIT(dev)]) == 0 || mi->mi_alive == 0)
		return (ENXIO);
	olddens = sc->sc_dens;
	dens = sc->sc_dens =
	    ((minor(dev)&H_1600BPI)?HTTC_1600BPI:HTTC_800BPI)|
		HTTC_PDP11|sc->sc_slave;
	htcommand(dev, HT_SENSE, 1);
	sc->sc_dens = olddens;
	if ((sc->sc_dsreg & HTDS_MOL) == 0) {
		uprintf("tu%d: not online\n", tuunit);
		return (EIO);
	}
	if ((flag&FWRITE) && (sc->sc_dsreg&HTDS_WRL)) {
		uprintf("tu%d: no write ring\n", tuunit);
		return (EIO);
	}
	if ((sc->sc_dsreg & HTDS_BOT) == 0 && (flag&FWRITE) &&
	    dens != sc->sc_dens) {
		uprintf("tu%d: can't change density in mid-tape\n", tuunit);
		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);
}

htclose(dev, flag)
	register dev_t dev;
	register flag;
{
	register struct tu_softc *sc = &tu_softc[TUUNIT(dev)];

	if (flag == FWRITE || ((flag&FWRITE) && (sc->sc_flags&H_WRITTEN))) {
		htcommand(dev, HT_WEOF, 1);
		htcommand(dev, HT_WEOF, 1);
		htcommand(dev, HT_SREV, 1);
	}
	if ((minor(dev)&H_NOREWIND) == 0)
		htcommand(dev, HT_REW, 0);
	sc->sc_openf = 0;
}

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

	bp = &chtbuf[HTUNIT(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;
	htstrategy(bp);
	if (count == 0)
		return;
	iowait(bp);
	if (bp->b_flags&B_WANTED)
		wakeup((caddr_t)bp);
	bp->b_flags &= B_ERROR;
}

htstrategy(bp)
	register struct buf *bp;
{
	register struct mba_device *mi = htinfo[HTUNIT(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);
}

htustart(mi)
	register struct mba_device *mi;
{
	register struct htdevice *htaddr =
	    (struct htdevice *)mi->mi_drv;
	register struct buf *bp = mi->mi_tab.b_actf;
	register struct tu_softc *sc = &tu_softc[TUUNIT(bp->b_dev)];
	daddr_t blkno;

	htaddr->httc = sc->sc_dens;
#ifdef	notdef
	/* unneeded, may hang controller */
	if (bp == &chtbuf[HTUNIT(bp->b_dev)] && bp->b_command == HT_SENSE) {
		htaddr->htcs1 = HT_SENSE|HT_GO;
		mbclrattn(mi);
	}
#endif
	sc->sc_dsreg = htaddr->htds;
	sc->sc_erreg = htaddr->hter;
	sc->sc_resid = htaddr->htfc;
	sc->sc_flags &= ~(H_WRITTEN|H_REWIND);
	if ((htaddr->htdt & HTDT_SPR) == 0 || (htaddr->htds & HTDS_MOL) == 0)
		if (sc->sc_openf > 0)
			sc->sc_openf = -1;
	if (sc->sc_openf < 0) {
		bp->b_flags |= B_ERROR;
		return (MBU_NEXT);
	}
	if (bp != &chtbuf[HTUNIT(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 {
		if (bp->b_command == HT_SENSE)
			return (MBU_NEXT);
		if (bp->b_command == HT_REW)
			sc->sc_flags |= H_REWIND;
		else
			htaddr->htfc = -bp->b_bcount;
		htaddr->htcs1 = bp->b_command|HT_GO;
		return (MBU_STARTED);
	}
	if ((blkno = sc->sc_blkno) == bdbtofsb(bp->b_blkno)) {
		htaddr->htfc = -bp->b_bcount;
		if ((bp->b_flags&B_READ) == 0) {
			if (mi->mi_tab.b_errcnt) {
				if ((sc->sc_flags & H_ERASED) == 0) {
					sc->sc_flags |= H_ERASED;
					htaddr->htcs1 = HT_ERASE | HT_GO;
					return (MBU_STARTED);
				}
				sc->sc_flags &= ~H_ERASED;
			}
			if (htaddr->htds & HTDS_EOT) {
				bp->b_resid = bp->b_bcount;
				bp->b_flags |= B_ERROR;
				return (MBU_NEXT);
			}
		}
		return (MBU_DODATA);
	}
	if (blkno < bdbtofsb(bp->b_blkno)) {
		htaddr->htfc = blkno - bdbtofsb(bp->b_blkno);
		htaddr->htcs1 = HT_SFORW|HT_GO;
	} else {
		htaddr->htfc = bdbtofsb(bp->b_blkno) - blkno;
		htaddr->htcs1 = HT_SREV|HT_GO;
	}
	return (MBU_STARTED);
}

htdtint(mi, mbsr)
	register struct mba_device *mi;
	int mbsr;
{
	register struct htdevice *htaddr = (struct htdevice *)mi->mi_drv;
	register struct buf *bp = mi->mi_tab.b_actf;
	register struct tu_softc *sc;
	int ds, er, mbs;

	sc = &tu_softc[TUUNIT(bp->b_dev)];
	ds = sc->sc_dsreg = MASKREG(htaddr->htds);
	er = sc->sc_erreg = MASKREG(htaddr->hter);
	sc->sc_resid = MASKREG(htaddr->htfc);
	mbs = mbsr;
	sc->sc_blkno++;
	if((bp->b_flags & B_READ) == 0)
		sc->sc_flags |= H_WRITTEN;
	if ((ds&(HTDS_ERR|HTDS_MOL)) != HTDS_MOL || mbs & MBSR_EBITS) {
		htaddr->htcs1 = HT_DCLR|HT_GO;
		mbclrattn(mi);
		if (bp == &rhtbuf[HTUNIT(bp->b_dev)]) {
			er &= ~HTER_FCE;
			mbs &= ~(MBSR_DTABT|MBSR_MBEXC);
		}
		if (bp->b_flags & B_READ && ds & HTDS_PES)
			er &= ~(HTER_CSITM|HTER_CORCRC);
		if (er&HTER_HARD || mbs&MBSR_EBITS || (ds&HTDS_MOL) == 0 ||
		    er && ++mi->mi_tab.b_errcnt >= 7) {
			if ((ds & HTDS_MOL) == 0 && sc->sc_openf > 0)
				sc->sc_openf = -1;
			if ((er&HTER_HARD) == HTER_FCE &&
			    (mbs&MBSR_EBITS) == (MBSR_DTABT|MBSR_MBEXC) &&
			    (ds&HTDS_MOL))
				goto noprint;
			printf("tu%d: hard error bn%d mbsr=%b er=%b ds=%b\n",
			    TUUNIT(bp->b_dev), bp->b_blkno,
			    mbsr, mbsr_bits,
			    sc->sc_erreg, hter_bits,
			    sc->sc_dsreg, htds_bits);
noprint:
			bp->b_flags |= B_ERROR;
			return (MBD_DONE);
		}
		if (er)
			return (MBD_RETRY);
	}
	bp->b_resid = 0;
	if (bp->b_flags & B_READ)
		if (ds&HTDS_TM) {		/* must be a read, right? */
			bp->b_resid = bp->b_bcount;
			sc->sc_nxrec = bdbtofsb(bp->b_blkno);
		} else if(bp->b_bcount > MASKREG(htaddr->htfc))
			bp->b_resid = bp->b_bcount - MASKREG(htaddr->htfc);
	return (MBD_DONE);
}

htndtint(mi)
	register struct mba_device *mi;
{
	register struct htdevice *htaddr = (struct htdevice *)mi->mi_drv;
	register struct buf *bp = mi->mi_tab.b_actf;
	register struct tu_softc *sc;
	int er, ds, fc;

	ds = MASKREG(htaddr->htds);
	er = MASKREG(htaddr->hter);
	fc = MASKREG(htaddr->htfc);
	if (er) {
		htaddr->htcs1 = HT_DCLR|HT_GO;
		mbclrattn(mi);
	}
	if (bp == 0)
		return (MBN_SKIP);
	sc = &tu_softc[TUUNIT(bp->b_dev)];
	sc->sc_dsreg = ds;
	sc->sc_erreg = er;
	sc->sc_resid = fc;
	if (bp == &chtbuf[HTUNIT(bp->b_dev)]) {
		switch (bp->b_command) {
		case HT_REWOFFL:
			/* offline is on purpose; don't do anything special */
			ds |= HTDS_MOL;	
			break;
		case HT_SREV:
			/* if backspace file hit bot, its not an error */
		        if (er == (HTER_NEF|HTER_FCE) && ds&HTDS_BOT &&
			    bp->b_repcnt == INF)
				er &= ~HTER_NEF;
			break;
		}
		er &= ~HTER_FCE;
		if (er == 0)
			ds &= ~HTDS_ERR;
	}
	if ((ds & (HTDS_ERR|HTDS_MOL)) != HTDS_MOL) {
		if ((ds & HTDS_MOL) == 0 && sc->sc_openf > 0)
			sc->sc_openf = -1;
		printf("tu%d: hard error bn%d er=%b ds=%b\n",
		    TUUNIT(bp->b_dev), bp->b_blkno,
		    sc->sc_erreg, hter_bits, sc->sc_dsreg, htds_bits);
		bp->b_flags |= B_ERROR;
		return (MBN_DONE);
	}
	if (bp == &chtbuf[HTUNIT(bp->b_dev)]) {
		if (sc->sc_flags & H_REWIND)
			return (ds & HTDS_BOT ? MBN_DONE : MBN_RETRY);
		bp->b_resid = -sc->sc_resid;
		return (MBN_DONE);
	}
	if (ds & HTDS_TM)
		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;
		}
	else
		sc->sc_blkno = bdbtofsb(bp->b_blkno);
	return (MBN_RETRY);
}

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

	errno = htphys(dev, uio);
	if (errno)
		return (errno);
	return (physio(htstrategy, &rhtbuf[HTUNIT(dev)], dev, B_READ, minphys, uio));
}

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

	errno = htphys(dev, uio);
	if (errno)
		return (errno);
	return (physio(htstrategy, &rhtbuf[HTUNIT(dev)], dev, B_WRITE, minphys, uio));
}

htphys(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	register int htunit;
	register struct tu_softc *sc;
	register struct mba_device *mi;
	daddr_t a;

	htunit = HTUNIT(dev);
	if (htunit >= NHT || (mi = htinfo[htunit]) == 0 || mi->mi_alive == 0)
		return (ENXIO);
	a = uio->uio_offset >> 9;
	sc = &tu_softc[TUUNIT(dev)];
	sc->sc_blkno = bdbtofsb(a);
	sc->sc_nxrec = bdbtofsb(a)+1;
	return (0);
}

/*ARGSUSED*/
htioctl(dev, cmd, data, flag)
	dev_t dev;
	int cmd;
	caddr_t data;
	int flag;
{
	register struct tu_softc *sc = &tu_softc[TUUNIT(dev)];
	register struct buf *bp = &chtbuf[HTUNIT(dev)];
	register callcount;
	int fcount;
	struct mtop *mtop;
	struct mtget *mtget;
	/* we depend of the values and order of the MT codes here */
	static htops[] =
   {HT_WEOF,HT_SFORW,HT_SREV,HT_SFORW,HT_SREV,HT_REW,HT_REWOFFL,HT_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 = INF;
			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);
		while (--callcount >= 0) {
			htcommand(dev, htops[mtop->mt_op], fcount);
			if ((mtop->mt_op == MTFSR || mtop->mt_op == MTBSR) &&
			    bp->b_resid)
				return (EIO);
			if ((bp->b_flags&B_ERROR) || sc->sc_dsreg&HTDS_BOT)
				break;
		}
		return (geterror(bp));	

	case MTIOCGET:
		mtget = (struct mtget *)data;
		mtget->mt_dsreg = sc->sc_dsreg;
		mtget->mt_erreg = sc->sc_erreg;
		mtget->mt_resid = sc->sc_resid;
		mtget->mt_type = MT_ISHT;
		break;

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

#define	DBSIZE	20

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

	start = 0;
	num = maxfree;
#define	phys(a,b)		((b)((int)(a)&0x7fffffff))
	if (htinfo[0] == 0)
		return (ENXIO);
	mi = phys(htinfo[0], struct mba_device *);
	mp = phys(mi->mi_hd, struct mba_hd *)->mh_physmba;
	mp->mba_cr = MBCR_IE;
	htaddr = (struct htdevice *)&mp->mba_drv[mi->mi_drive];
	htaddr->httc = HTTC_PDP11|HTTC_1600BPI;
	htaddr->htcs1 = HT_DCLR|HT_GO;
	while (num > 0) {
		blk = num > DBSIZE ? DBSIZE : num;
		htdwrite(start, blk, htaddr, mp);
		start += blk;
		num -= blk;
	}
	hteof(htaddr);
	hteof(htaddr);
	htwait(htaddr);
	if (htaddr->htds&HTDS_ERR)
		return (EIO);
	htaddr->htcs1 = HT_REW|HT_GO;
	return (0);
}

htdwrite(dbuf, num, htaddr, mp)
	register dbuf, num;
	register struct htdevice *htaddr;
	struct mba_regs *mp;
{
	register struct pte *io;
	register int i;

	htwait(htaddr);
	io = mp->mba_map;
	for (i = 0; i < num; i++)
		*(int *)io++ = dbuf++ | PG_V;
	htaddr->htfc = -(num*NBPG);
	mp->mba_sr = -1;
	mp->mba_bcr = -(num*NBPG);
	mp->mba_var = 0;
	htaddr->htcs1 = HT_WCOM|HT_GO;
}

htwait(htaddr)
	struct htdevice *htaddr;
{
	register s;

	do
		s = htaddr->htds;
	while ((s & HTDS_DRY) == 0);
}

hteof(htaddr)
	struct htdevice *htaddr;
{

	htwait(htaddr);
	htaddr->htcs1 = HT_WEOF|HT_GO;
}
#endif
Commit	Line	Data
fb6eeb38 C	1	/* ht.c 6.2 83/09/26 */
	2
	3	#include "tu.h"
	4	#if NHT > 0
	5	/*
	6	* TM03/TU?? tape driver
	7	*
	8	* TODO:
	9	* cleanup messages on errors
	10	* test ioctl's
	11	* see how many rewind interrups we get if we kick when not at BOT
	12	* fixup rle error on block tape code
	13	*/
	14	#include "../machine/pte.h"
	15
	16	#include "../h/param.h"
	17	#include "../h/systm.h"
	18	#include "../h/buf.h"
	19	#include "../h/conf.h"
	20	#include "../h/dir.h"
	21	#include "../h/file.h"
	22	#include "../h/user.h"
	23	#include "../h/map.h"
	24	#include "../h/ioctl.h"
	25	#include "../h/mtio.h"
	26	#include "../h/cmap.h"
	27	#include "../h/uio.h"
	28
	29	#include "../vax/cpu.h"
	30	#include "../vaxmba/mbareg.h"
	31	#include "../vaxmba/mbavar.h"
	32	#include "../vaxmba/htreg.h"
	33
	34	struct buf rhtbuf[NHT];
	35	struct buf chtbuf[NHT];
	36
	37	short httypes[] =
	38	{ MBDT_TM03, MBDT_TE16, MBDT_TU45, MBDT_TU77, 0 };
	39	struct mba_device *htinfo[NHT];
	40	int htattach(), htslave(), htustart(), htndtint(), htdtint();
	41	struct mba_driver htdriver =
	42	{ htattach, htslave, htustart, 0, htdtint, htndtint,
	43	httypes, "ht", "tu", htinfo };
	44
	45	#define MASKREG(r) ((r) & 0xffff)
	46
	47	/* bits in minor device */
	48	#define TUUNIT(dev) (minor(dev)&03)
	49	#define H_NOREWIND 04
	50	#define H_1600BPI 08
	51
	52	#define HTUNIT(dev) (tutoht[TUUNIT(dev)])
	53
	54	#define INF (daddr_t)1000000L /* a block number that wont exist */
	55
	56	struct tu_softc {
	57	char sc_openf;
	58	char sc_flags;
	59	daddr_t sc_blkno;
	60	daddr_t sc_nxrec;
	61	u_short sc_erreg;
	62	u_short sc_dsreg;
	63	short sc_resid;
	64	short sc_dens;
65	struct mba_device *sc_mi;
66	int sc_slave;
67	} tu_softc[NTU];
68	short tutoht[NTU];
69
70	/*
71	* Bits for sc_flags.
72	*/
73	#define H_WRITTEN 1 /* last operation was a write */
74	#define H_ERASED 2 /* last write retry was an erase gap */
75	#define H_REWIND 4 /* last unit start was a rewind */
76
77	char hter_bits[] = HTER_BITS;
78	char htds_bits[] = HTDS_BITS;
79
80	/ARGSUSED/
81	htattach(mi)
82	struct mba_device *mi;
83	{
84
85	}
86
87	htslave(mi, ms, sn)
88	struct mba_device *mi;
89	struct mba_slave *ms;
90	int sn;
91	{
92	register struct tu_softc *sc = &tu_softc[ms->ms_unit];
93	register struct htdevice htaddr = (struct htdevice )mi->mi_drv;
94
95	htaddr->httc = sn;
96	if (htaddr->htdt & HTDT_SPR) {
97	sc->sc_mi = mi;
98	sc->sc_slave = sn;
99	tutoht[ms->ms_unit] = mi->mi_unit;
100	return (1);
101	} else
102	return (0);
103	}
104
105	htopen(dev, flag)
106	dev_t dev;
107	int flag;
108	{
109	register int tuunit;
110	register struct mba_device *mi;
111	register struct tu_softc *sc;
112	int olddens, dens;
113
114	tuunit = TUUNIT(dev);
115	if (tuunit >= NTU \|\| (sc = &tu_softc[tuunit])->sc_openf \|\|
116	(mi = htinfo[HTUNIT(dev)]) == 0 \|\| mi->mi_alive == 0)
117	return (ENXIO);
118	olddens = sc->sc_dens;
119	dens = sc->sc_dens =
120	((minor(dev)&H_1600BPI)?HTTC_1600BPI:HTTC_800BPI)\|
121	HTTC_PDP11\|sc->sc_slave;
122	htcommand(dev, HT_SENSE, 1);
123	sc->sc_dens = olddens;
124	if ((sc->sc_dsreg & HTDS_MOL) == 0) {
125	uprintf("tu%d: not online\n", tuunit);
126	return (EIO);
127	}
128	if ((flag&FWRITE) && (sc->sc_dsreg&HTDS_WRL)) {
129	uprintf("tu%d: no write ring\n", tuunit);
130	return (EIO);
131	}
132	if ((sc->sc_dsreg & HTDS_BOT) == 0 && (flag&FWRITE) &&
133	dens != sc->sc_dens) {
134	uprintf("tu%d: can't change density in mid-tape\n", tuunit);
135	return (EIO);
136	}
137	sc->sc_openf = 1;
138	sc->sc_blkno = (daddr_t)0;
139	sc->sc_nxrec = INF;
140	sc->sc_flags = 0;
141	sc->sc_dens = dens;
142	return (0);
143	}
144
145	htclose(dev, flag)
146	register dev_t dev;
147	register flag;
148	{
149	register struct tu_softc *sc = &tu_softc[TUUNIT(dev)];
150
151	if (flag == FWRITE \|\| ((flag&FWRITE) && (sc->sc_flags&H_WRITTEN))) {
152	htcommand(dev, HT_WEOF, 1);
153	htcommand(dev, HT_WEOF, 1);
154	htcommand(dev, HT_SREV, 1);
155	}
156	if ((minor(dev)&H_NOREWIND) == 0)
157	htcommand(dev, HT_REW, 0);
158	sc->sc_openf = 0;
159	}
160
161	htcommand(dev, com, count)
162	dev_t dev;
163	int com, count;
164	{
165	register struct buf *bp;
166	register int s;
167
168	bp = &chtbuf[HTUNIT(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	htstrategy(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	htstrategy(bp)
192	register struct buf *bp;
193	{
194	register struct mba_device *mi = htinfo[HTUNIT(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	htustart(mi)
212	register struct mba_device *mi;
213	{
214	register struct htdevice *htaddr =
215	(struct htdevice *)mi->mi_drv;
216	register struct buf *bp = mi->mi_tab.b_actf;
217	register struct tu_softc *sc = &tu_softc[TUUNIT(bp->b_dev)];
218	daddr_t blkno;
219
220	htaddr->httc = sc->sc_dens;
221	#ifdef notdef
222	/* unneeded, may hang controller */
223	if (bp == &chtbuf[HTUNIT(bp->b_dev)] && bp->b_command == HT_SENSE) {
224	htaddr->htcs1 = HT_SENSE\|HT_GO;
225	mbclrattn(mi);
226	}
227	#endif
228	sc->sc_dsreg = htaddr->htds;
229	sc->sc_erreg = htaddr->hter;
230	sc->sc_resid = htaddr->htfc;
231	sc->sc_flags &= ~(H_WRITTEN\|H_REWIND);
232	if ((htaddr->htdt & HTDT_SPR) == 0 \|\| (htaddr->htds & HTDS_MOL) == 0)
233	if (sc->sc_openf > 0)
234	sc->sc_openf = -1;
235	if (sc->sc_openf < 0) {
236	bp->b_flags \|= B_ERROR;
237	return (MBU_NEXT);
238	}
239	if (bp != &chtbuf[HTUNIT(bp->b_dev)]) {
240	if (bdbtofsb(bp->b_blkno) > sc->sc_nxrec) {
241	bp->b_flags \|= B_ERROR;
242	bp->b_error = ENXIO;
243	return (MBU_NEXT);
244	}
245	if (bdbtofsb(bp->b_blkno) == sc->sc_nxrec &&
246	bp->b_flags&B_READ) {
247	bp->b_resid = bp->b_bcount;
248	clrbuf(bp);
249	return (MBU_NEXT);
250	}
251	if ((bp->b_flags&B_READ)==0)
252	sc->sc_nxrec = bdbtofsb(bp->b_blkno) + 1;
253	} else {
254	if (bp->b_command == HT_SENSE)
255	return (MBU_NEXT);
256	if (bp->b_command == HT_REW)
257	sc->sc_flags \|= H_REWIND;
258	else
259	htaddr->htfc = -bp->b_bcount;
260	htaddr->htcs1 = bp->b_command\|HT_GO;
261	return (MBU_STARTED);
262	}
263	if ((blkno = sc->sc_blkno) == bdbtofsb(bp->b_blkno)) {
264	htaddr->htfc = -bp->b_bcount;
265	if ((bp->b_flags&B_READ) == 0) {
266	if (mi->mi_tab.b_errcnt) {
267	if ((sc->sc_flags & H_ERASED) == 0) {
268	sc->sc_flags \|= H_ERASED;
269	htaddr->htcs1 = HT_ERASE \| HT_GO;
270	return (MBU_STARTED);
271	}
272	sc->sc_flags &= ~H_ERASED;
273	}
274	if (htaddr->htds & HTDS_EOT) {
275	bp->b_resid = bp->b_bcount;
276	bp->b_flags \|= B_ERROR;
277	return (MBU_NEXT);
278	}
279	}
280	return (MBU_DODATA);
281	}
282	if (blkno < bdbtofsb(bp->b_blkno)) {
283	htaddr->htfc = blkno - bdbtofsb(bp->b_blkno);
284	htaddr->htcs1 = HT_SFORW\|HT_GO;
285	} else {
286	htaddr->htfc = bdbtofsb(bp->b_blkno) - blkno;
287	htaddr->htcs1 = HT_SREV\|HT_GO;
288	}
289	return (MBU_STARTED);
290	}
291
292	htdtint(mi, mbsr)
293	register struct mba_device *mi;
294	int mbsr;
295	{
296	register struct htdevice htaddr = (struct htdevice )mi->mi_drv;
297	register struct buf *bp = mi->mi_tab.b_actf;
298	register struct tu_softc *sc;
299	int ds, er, mbs;
300
301	sc = &tu_softc[TUUNIT(bp->b_dev)];
302	ds = sc->sc_dsreg = MASKREG(htaddr->htds);
303	er = sc->sc_erreg = MASKREG(htaddr->hter);
304	sc->sc_resid = MASKREG(htaddr->htfc);
305	mbs = mbsr;
306	sc->sc_blkno++;
307	if((bp->b_flags & B_READ) == 0)
308	sc->sc_flags \|= H_WRITTEN;
309	if ((ds&(HTDS_ERR\|HTDS_MOL)) != HTDS_MOL \|\| mbs & MBSR_EBITS) {
310	htaddr->htcs1 = HT_DCLR\|HT_GO;
311	mbclrattn(mi);
312	if (bp == &rhtbuf[HTUNIT(bp->b_dev)]) {
313	er &= ~HTER_FCE;
314	mbs &= ~(MBSR_DTABT\|MBSR_MBEXC);
315	}
316	if (bp->b_flags & B_READ && ds & HTDS_PES)
317	er &= ~(HTER_CSITM\|HTER_CORCRC);
318	if (er&HTER_HARD \|\| mbs&MBSR_EBITS \|\| (ds&HTDS_MOL) == 0 \|\|
319	er && ++mi->mi_tab.b_errcnt >= 7) {
320	if ((ds & HTDS_MOL) == 0 && sc->sc_openf > 0)
321	sc->sc_openf = -1;
322	if ((er&HTER_HARD) == HTER_FCE &&
323	(mbs&MBSR_EBITS) == (MBSR_DTABT\|MBSR_MBEXC) &&
324	(ds&HTDS_MOL))
325	goto noprint;
326	printf("tu%d: hard error bn%d mbsr=%b er=%b ds=%b\n",
327	TUUNIT(bp->b_dev), bp->b_blkno,
328	mbsr, mbsr_bits,
329	sc->sc_erreg, hter_bits,
330	sc->sc_dsreg, htds_bits);
331	noprint:
332	bp->b_flags \|= B_ERROR;
333	return (MBD_DONE);
334	}
335	if (er)
336	return (MBD_RETRY);
337	}
338	bp->b_resid = 0;
339	if (bp->b_flags & B_READ)
340	if (ds&HTDS_TM) { /* must be a read, right? */
341	bp->b_resid = bp->b_bcount;
342	sc->sc_nxrec = bdbtofsb(bp->b_blkno);
343	} else if(bp->b_bcount > MASKREG(htaddr->htfc))
344	bp->b_resid = bp->b_bcount - MASKREG(htaddr->htfc);
345	return (MBD_DONE);
346	}
347
348	htndtint(mi)
349	register struct mba_device *mi;
350	{
351	register struct htdevice htaddr = (struct htdevice )mi->mi_drv;
352	register struct buf *bp = mi->mi_tab.b_actf;
353	register struct tu_softc *sc;
354	int er, ds, fc;
355
356	ds = MASKREG(htaddr->htds);
357	er = MASKREG(htaddr->hter);
358	fc = MASKREG(htaddr->htfc);
359	if (er) {
360	htaddr->htcs1 = HT_DCLR\|HT_GO;
361	mbclrattn(mi);
362	}
363	if (bp == 0)
364	return (MBN_SKIP);
365	sc = &tu_softc[TUUNIT(bp->b_dev)];
366	sc->sc_dsreg = ds;
367	sc->sc_erreg = er;
368	sc->sc_resid = fc;
369	if (bp == &chtbuf[HTUNIT(bp->b_dev)]) {
370	switch (bp->b_command) {
371	case HT_REWOFFL:
372	/* offline is on purpose; don't do anything special */
373	ds \|= HTDS_MOL;
374	break;
375	case HT_SREV:
376	/* if backspace file hit bot, its not an error */
377	if (er == (HTER_NEF\|HTER_FCE) && ds&HTDS_BOT &&
378	bp->b_repcnt == INF)
379	er &= ~HTER_NEF;
380	break;
381	}
382	er &= ~HTER_FCE;
383	if (er == 0)
384	ds &= ~HTDS_ERR;
385	}
386	if ((ds & (HTDS_ERR\|HTDS_MOL)) != HTDS_MOL) {
387	if ((ds & HTDS_MOL) == 0 && sc->sc_openf > 0)
388	sc->sc_openf = -1;
389	printf("tu%d: hard error bn%d er=%b ds=%b\n",
390	TUUNIT(bp->b_dev), bp->b_blkno,
391	sc->sc_erreg, hter_bits, sc->sc_dsreg, htds_bits);
392	bp->b_flags \|= B_ERROR;
393	return (MBN_DONE);
394	}
395	if (bp == &chtbuf[HTUNIT(bp->b_dev)]) {
396	if (sc->sc_flags & H_REWIND)
397	return (ds & HTDS_BOT ? MBN_DONE : MBN_RETRY);
398	bp->b_resid = -sc->sc_resid;
399	return (MBN_DONE);
400	}
401	if (ds & HTDS_TM)
402	if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) {
403	sc->sc_nxrec = bdbtofsb(bp->b_blkno) - fc;
404	sc->sc_blkno = sc->sc_nxrec;
405	} else {
406	sc->sc_blkno = bdbtofsb(bp->b_blkno) + fc;
407	sc->sc_nxrec = sc->sc_blkno - 1;
408	}
409	else
410	sc->sc_blkno = bdbtofsb(bp->b_blkno);
411	return (MBN_RETRY);
412	}
413
414	htread(dev, uio)
415	dev_t dev;
416	struct uio *uio;
417	{
418	int errno;
419
420	errno = htphys(dev, uio);
421	if (errno)
422	return (errno);
423	return (physio(htstrategy, &rhtbuf[HTUNIT(dev)], dev, B_READ, minphys, uio));
424	}
425
426	htwrite(dev, uio)
427	dev_t dev;
428	struct uio *uio;
429	{
430	int errno;
431
432	errno = htphys(dev, uio);
433	if (errno)
434	return (errno);
435	return (physio(htstrategy, &rhtbuf[HTUNIT(dev)], dev, B_WRITE, minphys, uio));
436	}
437
438	htphys(dev, uio)
439	dev_t dev;
440	struct uio *uio;
441	{
442	register int htunit;
443	register struct tu_softc *sc;
444	register struct mba_device *mi;
445	daddr_t a;
446
447	htunit = HTUNIT(dev);
448	if (htunit >= NHT \|\| (mi = htinfo[htunit]) == 0 \|\| mi->mi_alive == 0)
449	return (ENXIO);
450	a = uio->uio_offset >> 9;
451	sc = &tu_softc[TUUNIT(dev)];
452	sc->sc_blkno = bdbtofsb(a);
453	sc->sc_nxrec = bdbtofsb(a)+1;
454	return (0);
455	}
456
457	/ARGSUSED/
458	htioctl(dev, cmd, data, flag)
459	dev_t dev;
460	int cmd;
461	caddr_t data;
462	int flag;
463	{
464	register struct tu_softc *sc = &tu_softc[TUUNIT(dev)];
465	register struct buf *bp = &chtbuf[HTUNIT(dev)];
466	register callcount;
467	int fcount;
468	struct mtop *mtop;
469	struct mtget *mtget;
470	/* we depend of the values and order of the MT codes here */
471	static htops[] =
472	{HT_WEOF,HT_SFORW,HT_SREV,HT_SFORW,HT_SREV,HT_REW,HT_REWOFFL,HT_SENSE};
473
474	switch (cmd) {
475
476	case MTIOCTOP: /* tape operation */
477	mtop = (struct mtop *)data;
478	switch (mtop->mt_op) {
479
480	case MTWEOF:
481	callcount = mtop->mt_count;
482	fcount = 1;
483	break;
484
485	case MTFSF: case MTBSF:
486	callcount = mtop->mt_count;
487	fcount = INF;
488	break;
489
490	case MTFSR: case MTBSR:
491	callcount = 1;
492	fcount = mtop->mt_count;
493	break;
494
495	case MTREW: case MTOFFL:
496	callcount = 1;
497	fcount = 1;
498	break;
499
500	default:
501	return (ENXIO);
502	}
503	if (callcount <= 0 \|\| fcount <= 0)
504	return (EINVAL);
505	while (--callcount >= 0) {
506	htcommand(dev, htops[mtop->mt_op], fcount);
507	if ((mtop->mt_op == MTFSR \|\| mtop->mt_op == MTBSR) &&
508	bp->b_resid)
509	return (EIO);
510	if ((bp->b_flags&B_ERROR) \|\| sc->sc_dsreg&HTDS_BOT)
511	break;
512	}
513	return (geterror(bp));
514
515	case MTIOCGET:
516	mtget = (struct mtget *)data;
517	mtget->mt_dsreg = sc->sc_dsreg;
518	mtget->mt_erreg = sc->sc_erreg;
519	mtget->mt_resid = sc->sc_resid;
520	mtget->mt_type = MT_ISHT;
521	break;
522
523	default:
524	return (ENXIO);
525	}
526	return (0);
527	}
528
529	#define DBSIZE 20
530
531	htdump()
532	{
533	register struct mba_device *mi;
534	register struct mba_regs *mp;
535	register struct htdevice *htaddr;
536	int blk, num;
537	int start;
538
539	start = 0;
540	num = maxfree;
541	#define phys(a,b) ((b)((int)(a)&0x7fffffff))
542	if (htinfo[0] == 0)
543	return (ENXIO);
544	mi = phys(htinfo[0], struct mba_device *);
545	mp = phys(mi->mi_hd, struct mba_hd *)->mh_physmba;
546	mp->mba_cr = MBCR_IE;
547	htaddr = (struct htdevice *)&mp->mba_drv[mi->mi_drive];
548	htaddr->httc = HTTC_PDP11\|HTTC_1600BPI;
549	htaddr->htcs1 = HT_DCLR\|HT_GO;
550	while (num > 0) {
551	blk = num > DBSIZE ? DBSIZE : num;
552	htdwrite(start, blk, htaddr, mp);
553	start += blk;
554	num -= blk;
555	}
556	hteof(htaddr);
557	hteof(htaddr);
558	htwait(htaddr);
559	if (htaddr->htds&HTDS_ERR)
560	return (EIO);
561	htaddr->htcs1 = HT_REW\|HT_GO;
562	return (0);
563	}
564
565	htdwrite(dbuf, num, htaddr, mp)
566	register dbuf, num;
567	register struct htdevice *htaddr;
568	struct mba_regs *mp;
569	{
570	register struct pte *io;
571	register int i;
572
573	htwait(htaddr);
574	io = mp->mba_map;
575	for (i = 0; i < num; i++)
576	(int )io++ = dbuf++ \| PG_V;
577	htaddr->htfc = -(num*NBPG);
578	mp->mba_sr = -1;
579	mp->mba_bcr = -(num*NBPG);
580	mp->mba_var = 0;
581	htaddr->htcs1 = HT_WCOM\|HT_GO;
582	}
583
584	htwait(htaddr)
585	struct htdevice *htaddr;
586	{
587	register s;
588
589	do
590	s = htaddr->htds;
591	while ((s & HTDS_DRY) == 0);
592	}
593
594	hteof(htaddr)
595	struct htdevice *htaddr;
596	{
597
598	htwait(htaddr);
599	htaddr->htcs1 = HT_WEOF\|HT_GO;
600	}
601	#endif