X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/0a51498ead57beb885d7a5f15e32f51563792876..809050756a30fe4d50aa9388e51f189e1cdafee0:/usr/src/sys/vax/uba/tm.c

diff --git a/usr/src/sys/vax/uba/tm.c b/usr/src/sys/vax/uba/tm.c
index 8baf20f0f0..cd5e51af43 100644
--- a/usr/src/sys/vax/uba/tm.c
+++ b/usr/src/sys/vax/uba/tm.c
@@ -1,11 +1,17 @@
-/*	tm.c	4.2	%G%	*/
+/*	tm.c	4.22	%G%	*/
 
-#include "../conf/tm.h"
+#include "te.h"
 #if NTM > 0
+int	tmgapsdcnt;		/* DEBUG */
 /*
- * TM tape driver
+ * TM11/TE10 tape driver
+ *
+ * Todo:
+ *	Test driver with more than one slave
+ *	Test reset code
+ *	Do rewinds without hanging in driver
  */
-
+#define	DELAY(N)		{ register int d = N; while (--d > 0); }
 #include "../h/param.h"
 #include "../h/buf.h"
 #include "../h/dir.h"
@@ -14,168 +20,191 @@
 #include "../h/file.h"
 #include "../h/map.h"
 #include "../h/pte.h"
+#include "../h/vm.h"
 #include "../h/uba.h"
 #include "../h/mtio.h"
 #include "../h/ioctl.h"
-#include "../h/vm.h"
-
-struct device {
-	u_short	tmer;
-	u_short	tmcs;
-	short	tmbc;
-	u_short tmba;
-	short	tmdb;
-	short	tmrd;
-};
+#include "../h/cmap.h"
+#include "../h/cpu.h"
 
-#define	b_repcnt  b_bcount
-#define	b_command b_resid
+#include "../h/tmreg.h"
 
-struct	buf	tmtab;
-struct	buf	ctmbuf;
-struct	buf	rtmbuf;
+struct	buf	ctmbuf[NTE];
+struct	buf	rtmbuf[NTE];
 
-int	tm_ubinfo;
+int	tmprobe(), tmslave(), tmattach(), tmdgo(), tmintr();
+struct	uba_minfo *tmminfo[NTM];
+struct	uba_dinfo *tmdinfo[NTE];
+struct	buf tmutab[NTE];
+#ifdef notyet
+struct	uba_dinfo *tmip[NTM][4];
+#endif
+u_short	tmstd[] = { 0772520, 0 };
+struct	uba_driver tmdriver =
+ { tmprobe, tmslave, tmattach, tmdgo, tmstd, "te", tmdinfo, "tm", tmminfo, 0 };
 
 /* bits in minor device */
+#define	TMUNIT(dev)	(minor(dev)&03)
 #define	T_NOREWIND	04
 #define	T_1600BPI	08
 
 #define	INF	(daddr_t)1000000L
 
 /*
- * Really only handle one tape drive... if you have more than one,
- * you can make all these arrays and change the obvious things, but
- * it is not clear what happens when some drives are transferring while
- * others rewind, so we don't pretend that this driver handles multiple
- * tape drives.
+ * Software state per tape transport.
  */
-char	t_openf;
-daddr_t	t_blkno;
-char	t_flags;
-daddr_t	t_nxrec;
-u_short	t_erreg;
-u_short	t_dsreg;
-short	t_resid;
-
-/* bits in tmcs */
-#define	GO	01
-#define	OFFL	0
-#define	RCOM	02
-#define	WCOM	04
-#define	WEOF	06
-#define	SFORW	010
-#define	SREV	012
-#define	WIRG	014
-#define	REW	016
-#define	IENABLE	0100
-#define	CUR	0200
-#define	NOP	IENABLE
-#define	DCLR	010000
-#define	D800	060000
-#define	ERROR	0100000
-
-/* bits in tmer */
-#define	TUR	1
-#define	RWS	02
-#define	WRL	04
-#define	SDWN	010
-#define	BOT	040
-#define	SELR	0100
-#define	NXM	0200
-#define	TMBTE	0400
-#define	RLE	01000
-#define	EOT	02000
-#define	BGL	04000
-#define	PAE	010000
-#define	CRE	020000
-#define	EOF	040000
-#define	ILC	0100000
-
-#define	HARD    (ILC|EOT)
-#define	SOFT	(CRE|PAE|BGL|RLE|TMBTE|NXM)
+struct	tm_softc {
+	char	sc_openf;	/* lock against multiple opens */
+	char	sc_lastiow;	/* last op was a write */
+	daddr_t	sc_blkno;	/* block number, for block device tape */
+	daddr_t	sc_nxrec;	/* desired block position */
+	u_short	sc_erreg;	/* copy of last erreg */
+	u_short	sc_dsreg;	/* copy of last dsreg */
+	short	sc_resid;	/* copy of last bc */
+#ifdef notdef
+	short	sc_lastcmd;	/* last command to handle direction changes */
+#endif
+} tm_softc[NTM];
 
+/*
+ * States for um->um_tab.b_active, the
+ * per controller state flag.
+ */
 #define	SSEEK	1		/* seeking */
 #define	SIO	2		/* doing seq i/o */
 #define	SCOM	3		/* sending control command */
+#define	SREW	4		/* sending a drive rewind */
 
-#define	LASTIOW 1		/* last op was a write */
-#define	WAITREW	2		/* someone is waiting for a rewind */
+/* WE CURRENTLY HANDLE REWINDS PRIMITIVELY, BUSYING OUT THE CONTROLLER */
+/* DURING THE REWIND... IF WE EVER GET TWO TRANSPORTS, WE CAN DEBUG MORE */
+/* SOPHISTICATED LOGIC... THIS SIMPLE CODE AT LEAST MAY WORK. */
+
+/*
+ * Determine if there is a controller for
+ * a tm at address reg.  Our goal is to make the
+ * device interrupt.
+ */
+tmprobe(reg)
+	caddr_t reg;
+{
+	register int br, cvec;
+
+#ifdef lint
+	br = 0; br = cvec; cvec = br;
+#endif
+	((struct device *)reg)->tmcs = TM_IE;
+	/*
+	 * If this is a tm11, it ought to have interrupted
+	 * by now, if it isn't (ie: it is a ts04) then we just
+	 * hope that it didn't interrupt, so autoconf will ignore it.
+	 * Just in case, we will reference one
+	 * of the more distant registers, and hope for a machine
+	 * check, or similar disaster if this is a ts.
+	 *
+	 * Note: on an 11/780, badaddr will just generate
+	 * a uba error for a ts; but our caller will notice that
+	 * so we won't check for it.
+	 */
+	if (badaddr(&((struct device *)reg)->tmrd, 2))
+		return (0);
+	return (1);
+}
+
+/*
+ * Due to a design flaw, we cannot ascertain if the tape
+ * exists or not unless it is on line - ie: unless a tape is
+ * mounted. This is too servere a restriction to bear,
+ * so all units are assumed to exist.
+ */
+/*ARGSUSED*/
+tmslave(ui, reg)
+	struct uba_dinfo *ui;
+	caddr_t reg;
+{
+
+	return (1);
+}
+
+/*
+ * Record attachment of the unit to the controller port.
+ */
+/*ARGSUSED*/
+tmattach(ui)
+	struct uba_dinfo *ui;
+{
+
+#ifdef notyet
+	tmip[ui->ui_ctlr][ui->ui_slave] = ui;
+#endif
+}
 
+/*
+ * Open the device.  Tapes are unique open
+ * devices, so we refuse if it is already open.
+ * We also check that a tape is available, and
+ * don't block waiting here.
+ */
 tmopen(dev, flag)
 	dev_t dev;
 	int flag;
 {
-	register ds, unit;
+	register int unit;
+	register struct uba_dinfo *ui;
+	register struct tm_softc *sc;
 
-	tmtab.b_flags |= B_TAPE;
-	unit = minor(dev)&03;
-	if (unit >= NTM || t_openf) {
-		u.u_error = ENXIO;		/* out of range or open */
-		return;
-	}
-	tcommand(dev, NOP, 1);
-	if ((t_erreg&SELR) == 0) {
-		u.u_error = EIO;		/* offline */
+	unit = TMUNIT(dev);
+	if (unit>=NTE || (sc = &tm_softc[unit])->sc_openf ||
+	    (ui = tmdinfo[unit]) == 0 || ui->ui_alive == 0) {
+		u.u_error = ENXIO;
 		return;
 	}
-	t_openf = 1;
-	if (t_erreg&RWS)
-		tmwaitrws(dev);			/* wait for rewind complete */
-	while (t_erreg&SDWN)
-		tcommand(dev, NOP, 1);		/* await settle down */
-	if ((t_erreg&TUR)==0 ||
-	    ((flag&(FREAD|FWRITE)) == FWRITE && (t_erreg&WRL))) {
-		TMADDR->tmcs = DCLR|GO;
-		u.u_error = EIO;		/* offline or write protect */
-	}
-	if (u.u_error != 0) {
-		t_openf = 0;
+	tmcommand(dev, TM_SENSE, 1);
+	if ((sc->sc_erreg&(TM_SELR|TM_TUR)) != (TM_SELR|TM_TUR) ||
+	    (flag&(FREAD|FWRITE)) == FWRITE && sc->sc_erreg&TM_WRL) {
+		u.u_error = EIO;
 		return;
 	}
-	t_blkno = (daddr_t)0;
-	t_nxrec = INF;
-	t_flags = 0;
-	t_openf = 1;
-}
-
-tmwaitrws(dev)
-	register dev;
-{
-
-	spl5();
-	for (;;) {
-		if ((TMADDR->tmer&RWS) == 0) {
-			spl0();		/* rewind complete */
-			return;
-		}
-		t_flags |= WAITREW;
-		sleep((caddr_t)&t_flags, PRIBIO);
-	}
+	sc->sc_openf = 1;
+	sc->sc_blkno = (daddr_t)0;
+	sc->sc_nxrec = INF;
+	sc->sc_lastiow = 0;
 }
 
+/*
+ * Close tape device.
+ *
+ * If tape was open for writing or last operation was
+ * a write, then write two EOF's and backspace over the last one.
+ * Unless this is a non-rewinding special file, rewind the tape.
+ * Make the tape available to others.
+ */
 tmclose(dev, flag)
 	register dev_t dev;
 	register flag;
 {
+	register struct tm_softc *sc = &tm_softc[TMUNIT(dev)];
 
-	if (flag == FWRITE || ((flag&FWRITE) && (t_flags&LASTIOW))) {
-		tcommand(dev, WEOF, 1);
-		tcommand(dev, WEOF, 1);
-		tcommand(dev, SREV, 1);
+	if (flag == FWRITE || (flag&FWRITE) && sc->sc_lastiow) {
+		tmcommand(dev, TM_WEOF, 1);
+		tmcommand(dev, TM_WEOF, 1);
+		tmcommand(dev, TM_SREV, 1);
 	}
 	if ((minor(dev)&T_NOREWIND) == 0)
-		tcommand(dev, REW, 1);
-	t_openf = 0;
+		tmcommand(dev, TM_REW, 1);
+	sc->sc_openf = 0;
 }
 
-tcommand(dev, com, count)
+/*
+ * Execute a command on the tape drive
+ * a specified number of times.
+ */
+tmcommand(dev, com, count)
 	dev_t dev;
 	int com, count;
 {
 	register struct buf *bp;
 
-	bp = &ctmbuf;
+	bp = &ctmbuf[TMUNIT(dev)];
 	(void) spl5();
 	while (bp->b_flags&B_BUSY) {
 		bp->b_flags |= B_WANTED;
@@ -194,245 +223,465 @@ tcommand(dev, com, count)
 	bp->b_flags &= B_ERROR;
 }
 
+/*
+ * Decipher a tape operation and do what is needed
+ * to see that it happens.
+ */
 tmstrategy(bp)
 	register struct buf *bp;
 {
-	register daddr_t *p;
-
-	tmwaitrws(bp->b_dev);
-	if (bp != &ctmbuf) {
-		p = &t_nxrec;
-		if (dbtofsb(bp->b_blkno) > *p) {
-			bp->b_flags |= B_ERROR;
-			bp->b_error = ENXIO;		/* past EOF */
-			iodone(bp);
-			return;
-		} else if (dbtofsb(bp->b_blkno) == *p && bp->b_flags&B_READ) {
-			bp->b_resid = bp->b_bcount;
-			clrbuf(bp);			/* at EOF */
-			iodone(bp);
-			return;
-		} else if ((bp->b_flags&B_READ) == 0)
-			*p = dbtofsb(bp->b_blkno) + 1;	/* write sets EOF */
-	}
+	int unit = TMUNIT(bp->b_dev);
+	register struct uba_minfo *um;
+	register struct buf *dp;
+	register struct tm_softc *sc = &tm_softc[unit];
+
+	/*
+	 * Put transfer at end of unit queue
+	 */
+	dp = &tmutab[unit];
 	bp->av_forw = NULL;
 	(void) spl5();
-	if (tmtab.b_actf == NULL)
-		tmtab.b_actf = bp;
-	else
-		tmtab.b_actl->av_forw = bp;
-	tmtab.b_actl = bp;
-	if (tmtab.b_active == 0)
-		tmstart();
+	if (dp->b_actf == NULL) {
+		dp->b_actf = bp;
+		/*
+		 * Transport not already active...
+		 * put at end of controller queue.
+		 */
+		dp->b_forw = NULL;
+		um = tmdinfo[unit]->ui_mi;
+		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;
+	} else
+		dp->b_actl->av_forw = bp;
+	dp->b_actl = bp;
+	/*
+	 * If the controller is not busy, get
+	 * it going.
+	 */
+	if (um->um_tab.b_active == 0)
+		tmstart(um);
 	(void) spl0();
 }
 
-tmstart()
+/*
+ * Start activity on a tm controller.
+ */
+tmstart(um)
+	register struct uba_minfo *um;
 {
-	register struct buf *bp;
-	register cmd;
-	register daddr_t blkno;
-
+	register struct buf *bp, *dp;
+	register struct device *addr = (struct device *)um->um_addr;
+	register struct tm_softc *sc;
+	register struct uba_dinfo *ui;
+	int unit, cmd;
+	daddr_t blkno;
+
+	/*
+	 * Look for an idle transport on the controller.
+	 */
 loop:
-	if ((bp = tmtab.b_actf) == 0)
+	if ((dp = um->um_tab.b_actf) == NULL)
 		return;
-	t_dsreg = TMADDR->tmcs;
-	t_erreg = TMADDR->tmer;
-	t_resid = TMADDR->tmbc;
-	t_flags &= ~LASTIOW;
-	if (t_openf < 0 || (TMADDR->tmcs&CUR) == 0) {
-		/* t_openf = -1; ??? */
-		bp->b_flags |= B_ERROR;		/* hard error'ed or !SELR */
+	if ((bp = dp->b_actf) == NULL) {
+		um->um_tab.b_actf = dp->b_forw;
+		goto loop;
+	}
+	unit = TMUNIT(bp->b_dev);
+	ui = tmdinfo[unit];
+	/*
+	 * Record pre-transfer status (e.g. for TM_SENSE)
+	 */
+	sc = &tm_softc[unit];
+	addr = (struct device *)um->um_addr;
+	addr->tmcs = (ui->ui_slave << 8);
+	sc->sc_dsreg = addr->tmcs;
+	sc->sc_erreg = addr->tmer;
+	sc->sc_resid = addr->tmbc;
+	/*
+	 * Default is that last command was NOT a write command;
+	 * if we do a write command we will notice this in tmintr().
+	 */
+	sc->sc_lastiow = 1;
+	if (sc->sc_openf < 0 || (addr->tmcs&TM_CUR) == 0) {
+		/*
+		 * Have had a hard error on this (non-raw) tape,
+		 * or the tape unit is now unavailable (e.g. taken off
+		 * line).
+		 */
+		bp->b_flags |= B_ERROR;
 		goto next;
 	}
-	cmd = IENABLE | GO;
-	if ((minor(bp->b_dev) & T_1600BPI) == 0)
-		cmd |= D800;
-	if (bp == &ctmbuf) {
-		if (bp->b_command == NOP)
-			goto next;		/* just get status */
-		else {
-			cmd |= bp->b_command;
-			tmtab.b_active = SCOM;
-			if (bp->b_command == SFORW || bp->b_command == SREV)
-				TMADDR->tmbc = bp->b_repcnt;
-			TMADDR->tmcs = cmd;
-			return;
+	/*
+	 * If operation is not a control operation,
+	 * check for boundary conditions.
+	 */
+	if (bp != &ctmbuf[unit]) {
+		if (dbtofsb(bp->b_blkno) > sc->sc_nxrec) {
+			bp->b_flags |= B_ERROR;
+			bp->b_error = ENXIO;		/* past EOF */
+			goto next;
+		}
+		if (dbtofsb(bp->b_blkno) == sc->sc_nxrec &&
+		    bp->b_flags&B_READ) {
+			bp->b_resid = bp->b_bcount;
+			clrbuf(bp);			/* at EOF */
+			goto next;
 		}
+		if ((bp->b_flags&B_READ) == 0)
+			/* write sets EOF */
+			sc->sc_nxrec = dbtofsb(bp->b_blkno) + 1;
 	}
-	if ((blkno = t_blkno) == dbtofsb(bp->b_blkno)) {
-		TMADDR->tmbc = -bp->b_bcount;
-		if (tm_ubinfo == 0)
-			tm_ubinfo = ubasetup(bp,1);
+	/*
+	 * Set up the command, and then if this is a mt ioctl,
+	 * do the operation using, for TM_SFORW and TM_SREV, the specified
+	 * operation count.
+	 */
+	cmd = TM_IE | TM_GO | (ui->ui_slave << 8);
+	if ((minor(bp->b_dev) & T_1600BPI) == 0)
+		cmd |= TM_D800;
+	if (bp == &ctmbuf[unit]) {
+		if (bp->b_command == TM_SENSE)
+			goto next;
+		um->um_tab.b_active =
+		    bp->b_command == TM_REW ? SREW : SCOM;
+		if (bp->b_command == TM_SFORW || bp->b_command == TM_SREV)
+			addr->tmbc = bp->b_repcnt;
+		goto dobpcmd;
+	}
+	/*
+	 * If the data transfer command is in the correct place,
+	 * set up all the registers except the csr, and give
+	 * control over to the UNIBUS adapter routines, to
+	 * wait for resources to start the i/o.
+	 */
+	if ((blkno = sc->sc_blkno) == dbtofsb(bp->b_blkno)) {
+		addr->tmbc = -bp->b_bcount;
 		if ((bp->b_flags&B_READ) == 0) {
-			if (tmtab.b_errcnt)
-				cmd |= WIRG;
+			if (um->um_tab.b_errcnt)
+				cmd |= TM_WIRG;
 			else
-				cmd |= WCOM;
+				cmd |= TM_WCOM;
 		} else
-			cmd |= RCOM;
-		cmd |= (tm_ubinfo >> 12) & 0x30;
-		tmtab.b_active = SIO;
-		TMADDR->tmba = tm_ubinfo;
-		TMADDR->tmcs = cmd; 
+			cmd |= TM_RCOM;
+		um->um_tab.b_active = SIO;
+		um->um_cmd = cmd;
+#ifdef notdef
+		if (tmreverseop(sc->sc_lastcmd))
+			while (addr->tmer & TM_SDWN)
+				tmgapsdcnt++;
+		sc->sc_lastcmd = TM_RCOM;		/* will serve */
+#endif
+		ubago(ui);
 		return;
 	}
-	tmtab.b_active = SSEEK;
+	/*
+	 * Block tape positioned incorrectly;
+	 * seek forwards or backwards to the correct spot.
+	 */
+	um->um_tab.b_active = SSEEK;
 	if (blkno < dbtofsb(bp->b_blkno)) {
-		cmd |= SFORW;
-		TMADDR->tmbc = blkno - dbtofsb(bp->b_blkno);
+		bp->b_command = TM_SFORW;
+		addr->tmbc = blkno - dbtofsb(bp->b_blkno);
 	} else {
-		cmd |= SREV;
-		TMADDR->tmbc = dbtofsb(bp->b_blkno) - blkno;
+		bp->b_command = TM_SREV;
+		addr->tmbc = dbtofsb(bp->b_blkno) - blkno;
 	}
-	TMADDR->tmcs = cmd;
+dobpcmd:
+#ifdef notdef
+	if (tmreverseop(sc->sc_lastcmd) != tmreverseop(bp->b_command))
+		while (addr->tmer & TM_SDWN)
+			tmgapsdcnt++;
+	sc->sc_lastcmd = bp->b_command;
+#endif
+	addr->tmcs = (cmd | bp->b_command);
 	return;
 
 next:
-	if (tm_ubinfo != 0) {
-		ubafree(tm_ubinfo);
-		tm_ubinfo = 0;
-	}
-	tmtab.b_actf = bp->av_forw;
+	/*
+	 * Done with this operation due to error or
+	 * the fact that it doesn't do anything.
+	 * Release UBA resources (if any), dequeue
+	 * the transfer and continue processing this slave.
+	 */
+	if (um->um_ubinfo)
+		ubadone(um);
+	um->um_tab.b_errcnt = 0;
+	dp->b_actf = bp->av_forw;
 	iodone(bp);
 	goto loop;
 }
 
-tmintr()
+/*
+ * The UNIBUS resources we needed have been
+ * allocated to us; start the device.
+ */
+tmdgo(um)
+	register struct uba_minfo *um;
+{
+	register struct device *addr = (struct device *)um->um_addr;
+
+	addr->tmba = um->um_ubinfo;
+	addr->tmcs = um->um_cmd | ((um->um_ubinfo >> 12) & 0x30);
+}
+
+/*
+ * Tm interrupt routine.
+ */
+/*ARGSUSED*/
+tmintr(tm11)
+	int tm11;
 {
+	struct buf *dp;
 	register struct buf *bp;
+	register struct uba_minfo *um = tmminfo[tm11];
+	register struct device *addr = (struct device *)tmdinfo[tm11]->ui_addr;
+	register struct tm_softc *sc;
+	int unit;
 	register state;
 
-	if (t_flags&WAITREW && (TMADDR->tmer&RWS) == 0) {
-		t_flags &= ~WAITREW;
-		wakeup((caddr_t)&t_flags);
+	/*
+	 * If last command was a rewind, and tape is still
+	 * rewinding, wait for the rewind complete interrupt.
+	 */
+	if (um->um_tab.b_active == SREW) {
+		um->um_tab.b_active = SCOM;
+		if (addr->tmer&TM_RWS)
+			return;
 	}
-	if ((bp = tmtab.b_actf) == NULL)
+	/*
+	 * An operation completed... record status
+	 */
+	if ((dp = um->um_tab.b_actf) == NULL)
 		return;
-	t_dsreg = TMADDR->tmcs;
-	t_erreg = TMADDR->tmer;
-	t_resid = TMADDR->tmbc;
+	bp = dp->b_actf;
+	unit = TMUNIT(bp->b_dev);
+	sc = &tm_softc[unit];
+	sc->sc_dsreg = addr->tmcs;
+	sc->sc_erreg = addr->tmer;
+	sc->sc_resid = addr->tmbc;
 	if ((bp->b_flags & B_READ) == 0)
-		t_flags |= LASTIOW;
-	state = tmtab.b_active;
-	tmtab.b_active = 0;
-	if (TMADDR->tmcs&ERROR) {
-		while(TMADDR->tmer & SDWN)
+		sc->sc_lastiow = 1;
+	state = um->um_tab.b_active;
+	um->um_tab.b_active = 0;
+	/*
+	 * Check for errors.
+	 */
+	if (addr->tmcs&TM_ERR) {
+		while (addr->tmer & TM_SDWN)
 			;			/* await settle down */
-		if (TMADDR->tmer&EOF) {
-			tmseteof(bp);	/* set blkno and nxrec */
-			state = SCOM;
-			TMADDR->tmbc = -bp->b_bcount;
-			goto errout;
+		/*
+		 * If we hit the end of the tape update our position.
+		 */
+		if (addr->tmer&TM_EOF) {
+			tmseteof(bp);		/* set blkno and nxrec */
+			state = SCOM;		/* force completion */
+			/*
+			 * Stuff bc so it will be unstuffed correctly
+			 * later to get resid.
+			 */
+			addr->tmbc = -bp->b_bcount;
+			goto opdone;
 		}
-		if ((bp->b_flags&B_READ) && (TMADDR->tmer&(HARD|SOFT)) == RLE)
-			goto out;
-		if ((TMADDR->tmer&HARD)==0 && state==SIO) {
-			if (++tmtab.b_errcnt < 7) {
-				if((TMADDR->tmer&SOFT) == NXM)
-					printf("TM UBA late error\n");
-				else
-					t_blkno += 2;		/* ???????? */
-				if (tm_ubinfo) {
-					ubafree(tm_ubinfo);
-					tm_ubinfo = 0;
-				}
-				tmstart();
-				return;
+		/*
+		 * If we were reading and the only error was that the
+		 * record was to long, then we don't consider this an error.
+		 */
+		if ((bp->b_flags&B_READ) &&
+		    (addr->tmer&(TM_HARD|TM_SOFT)) == TM_RLE)
+			goto ignoreerr;
+		/*
+		 * If error is not hard, and this was an i/o operation
+		 * retry up to 8 times.
+		 */
+		if ((addr->tmer&TM_HARD)==0 && state==SIO) {
+			if (++um->um_tab.b_errcnt < 7) {
+				sc->sc_blkno++;
+				ubadone(um);
+				goto opcont;
 			}
-		} else if (t_openf>0 && bp != &rtmbuf)
-			t_openf = -1;
-		deverror(bp, t_erreg, t_dsreg);
+		} else
+			/*
+			 * Hard or non-i/o errors on non-raw tape
+			 * cause it to close.
+			 */
+			if (sc->sc_openf>0 && bp != &rtmbuf[unit])
+				sc->sc_openf = -1;
+		/*
+		 * Couldn't recover error
+		 */
+		printf("te%d: hard error bn%d er=%b\n", minor(bp->b_dev)&03,
+		    bp->b_blkno, sc->sc_erreg, TMEREG_BITS);
 		bp->b_flags |= B_ERROR;
-		state = SIO;
+		goto opdone;
 	}
-out:
+	/*
+	 * Advance tape control FSM.
+	 */
+ignoreerr:
 	switch (state) {
 
 	case SIO:
-		t_blkno++;
-		/* fall into ... */
+		/*
+		 * Read/write increments tape block number
+		 */
+		sc->sc_blkno++;
+		goto opdone;
 
 	case SCOM:
-		if (bp == &ctmbuf) {
-			switch (bp->b_command) {
-			case SFORW:
-				t_blkno -= bp->b_repcnt;
-				break;
+		/*
+		 * Unless special operation, op completed.
+		 */
+		if (bp != &ctmbuf[unit])
+			goto opdone;
+		/*
+		 * Operation on block device...
+		 * iterate operations which don't repeat
+		 * for themselves in the hardware; for forward/
+		 * backward space record update the current position.
+		 */
+		switch (bp->b_command) {
+
+		case TM_SFORW:
+			sc->sc_blkno -= bp->b_repcnt;
+			goto opdone;
+
+		case TM_SREV:
+			sc->sc_blkno += bp->b_repcnt;
+			goto opdone;
 
-			case SREV:
-				t_blkno += bp->b_repcnt;
-				break;
-
-			default:
-				if (++bp->b_repcnt < 0) {
-					tmstart();	/* continue */
-					return;
-				}
-			}
-		}
-errout:
-		tmtab.b_errcnt = 0;
-		tmtab.b_actf = bp->av_forw;
-		bp->b_resid = -TMADDR->tmbc;
-		if (tm_ubinfo != 0) {
-			ubafree(tm_ubinfo);
-			tm_ubinfo = 0;
+		default:
+			if (++bp->b_repcnt < 0)
+				goto opcont;
+			goto opdone;
 		}
-		iodone(bp);
-		break;
 
 	case SSEEK:
-		t_blkno = dbtofsb(bp->b_blkno);
-		break;
+		sc->sc_blkno = dbtofsb(bp->b_blkno);
+		goto opcont;
 
 	default:
-		return;
+		panic("tmintr");
+	}
+opdone:
+	/*
+	 * Reset error count and remove
+	 * from device queue.
+	 */
+	um->um_tab.b_errcnt = 0;
+	dp->b_actf = bp->av_forw;
+	bp->b_resid = -addr->tmbc;
+	ubadone(um);
+	iodone(bp);
+	/*
+	 * Circulate slave to end of controller
+	 * queue to give other slaves a chance.
+	 */
+	um->um_tab.b_actf = dp->b_forw;
+	if (dp->b_actf) {
+		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;
 	}
-	tmstart();
+	if (um->um_tab.b_actf == 0)
+		return;
+opcont:
+	tmstart(um);
 }
 
 tmseteof(bp)
 	register struct buf *bp;
 {
+	register int unit = TMUNIT(bp->b_dev);
+	register struct device *addr = 
+	    (struct device *)tmdinfo[unit]->ui_addr;
+	register struct tm_softc *sc = &tm_softc[unit];
 
-	if (bp == &ctmbuf) {
-		if (t_blkno > dbtofsb(bp->b_blkno)) {
+	if (bp == &ctmbuf[unit]) {
+		if (sc->sc_blkno > dbtofsb(bp->b_blkno)) {
 			/* reversing */
-			t_nxrec = dbtofsb(bp->b_blkno) - TMADDR->tmbc;
-			t_blkno = t_nxrec;
+			sc->sc_nxrec = dbtofsb(bp->b_blkno) - addr->tmbc;
+			sc->sc_blkno = sc->sc_nxrec;
 		} else {
 			/* spacing forward */
-			t_blkno = dbtofsb(bp->b_blkno) + TMADDR->tmbc;
-			t_nxrec = t_blkno - 1;
+			sc->sc_blkno = dbtofsb(bp->b_blkno) + addr->tmbc;
+			sc->sc_nxrec = sc->sc_blkno - 1;
 		}
 		return;
 	} 
 	/* eof on read */
-	t_nxrec = dbtofsb(bp->b_blkno);
+	sc->sc_nxrec = dbtofsb(bp->b_blkno);
 }
 
 tmread(dev)
+	dev_t dev;
 {
 
 	tmphys(dev);
-	physio(tmstrategy, &rtmbuf, dev, B_READ, minphys);
+	physio(tmstrategy, &rtmbuf[TMUNIT(dev)], dev, B_READ, minphys);
 }
 
 tmwrite(dev)
+	dev_t dev;
 {
 
 	tmphys(dev);
-	physio(tmstrategy, &rtmbuf, dev, B_WRITE, minphys);
+	physio(tmstrategy, &rtmbuf[TMUNIT(dev)], dev, B_WRITE, minphys);
 }
 
 tmphys(dev)
+	dev_t dev;
 {
 	register daddr_t a;
+	register struct tm_softc *sc = &tm_softc[TMUNIT(dev)];
 
 	a = dbtofsb(u.u_offset >> 9);
-	t_blkno = a;
-	t_nxrec = a + 1;
+	sc->sc_blkno = a;
+	sc->sc_nxrec = a + 1;
+}
+
+tmreset(uban)
+	int uban;
+{
+	register struct uba_minfo *um;
+	register tm11, unit;
+	register struct uba_dinfo *ui;
+	register struct buf *dp;
+
+	for (tm11 = 0; tm11 < NTM; tm11++) {
+		if ((um = tmminfo[tm11]) == 0 || um->um_alive == 0 ||
+		   um->um_ubanum != uban)
+			continue;
+		printf(" tm%d", tm11);
+		um->um_tab.b_active = 0;
+		um->um_tab.b_actf = um->um_tab.b_actl = 0;
+		if (um->um_ubinfo) {
+			printf("<%d>", (um->um_ubinfo>>28)&0xf);
+			ubadone(um);
+		}
+		((struct device *)(um->um_addr))->tmcs = TM_DCLR;
+		for (unit = 0; unit < NTE; unit++) {
+			if ((ui = tmdinfo[unit]) == 0)
+				continue;
+			if (ui->ui_alive == 0)
+				continue;
+			dp = &tmutab[unit];
+			dp->b_active = 0;
+			dp->b_forw = 0;
+			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;
+			tm_softc[unit].sc_openf = -1;
+		}
+		tmstart(um);
+	}
 }
 
 /*ARGSUSED*/
@@ -440,21 +689,29 @@ tmioctl(dev, cmd, addr, flag)
 	caddr_t addr;
 	dev_t dev;
 {
+	int unit = TMUNIT(dev);
+	register struct tm_softc *sc = &tm_softc[unit];
+	register struct buf *bp = &ctmbuf[unit];
 	register callcount;
 	int fcount;
 	struct mtop mtop;
 	struct mtget mtget;
 	/* we depend of the values and order of the MT codes here */
-	static tmops[] = {WEOF, SFORW, SREV, SFORW, SREV, REW, OFFL};
+	static tmops[] =
+	   {TM_WEOF,TM_SFORW,TM_SREV,TM_SFORW,TM_SREV,TM_REW,TM_OFFL,TM_SENSE};
 
-	switch(cmd) {
+	switch (cmd) {
 		case MTIOCTOP:	/* tape operation */
 		if (copyin((caddr_t)addr, (caddr_t)&mtop, sizeof(mtop))) {
 			u.u_error = EFAULT;
 			return;
 		}
 		switch(mtop.mt_op) {
-		case MTWEOF: case MTFSF: case MTBSF:
+		case MTWEOF:
+			callcount = mtop.mt_count;
+			fcount = 1;
+			break;
+		case MTFSF: case MTBSF:
 			callcount = mtop.mt_count;
 			fcount = INF;
 			break;
@@ -462,7 +719,7 @@ tmioctl(dev, cmd, addr, flag)
 			callcount = 1;
 			fcount = mtop.mt_count;
 			break;
-		case MTREW: case MTOFFL:
+		case MTREW: case MTOFFL: case MTNOP:
 			callcount = 1;
 			fcount = 1;
 			break;
@@ -470,24 +727,26 @@ tmioctl(dev, cmd, addr, flag)
 			u.u_error = ENXIO;
 			return;
 		}
-		if (callcount <= 0 || fcount <= 0)
+		if (callcount <= 0 || fcount <= 0) {
 			u.u_error = ENXIO;
-		else while (--callcount >= 0) {
-			tcommand(dev, tmops[mtop.mt_op], fcount);
+			return;
+		}
+		while (--callcount >= 0) {
+			tmcommand(dev, tmops[mtop.mt_op], fcount);
 			if ((mtop.mt_op == MTFSR || mtop.mt_op == MTBSR) &&
-			    ctmbuf.b_resid) {
+			    bp->b_resid) {
 				u.u_error = EIO;
 				break;
 			}
-			if ((ctmbuf.b_flags&B_ERROR) || t_erreg&BOT)
+			if ((bp->b_flags&B_ERROR) || sc->sc_erreg&TM_BOT)
 				break;
 		}
-		geterror(&ctmbuf);
+		geterror(bp);
 		return;
 	case MTIOCGET:
-		mtget.mt_dsreg = t_dsreg;
-		mtget.mt_erreg = t_erreg;
-		mtget.mt_resid = t_resid;
+		mtget.mt_dsreg = sc->sc_dsreg;
+		mtget.mt_erreg = sc->sc_erreg;
+		mtget.mt_resid = sc->sc_resid;
 		if (copyout((caddr_t)&mtget, addr, sizeof(mtget)))
 			u.u_error = EFAULT;
 		return;
@@ -498,67 +757,79 @@ tmioctl(dev, cmd, addr, flag)
 
 #define	DBSIZE	20
 
-twall(start, num)
-	int start, num;
+tmdump()
 {
-#if VAX==780
-	register struct uba_regs *up = (struct uba_regs *)PHYSUBA0;
-#endif
-	int blk;
-
-	TMPHYS->tmcs = DCLR | GO;
-#if VAX==780
-	up->uba_cr = ADINIT;
-	up->uba_cr = IFS|BRIE|USEFIE|SUEFIE;
-	while ((up->uba_cnfgr & UBIC) == 0)
-		;
+	register struct uba_dinfo *ui;
+	register struct uba_regs *up;
+	register struct device *addr;
+	int blk, num;
+	int start;
+
+	start = 0;
+	num = maxfree;
+#define	phys(a,b)	((b)((int)(a)&0x7fffffff))
+	if (tmdinfo[0] == 0)
+		return (ENXIO);
+	ui = phys(tmdinfo[0], struct uba_dinfo *);
+	up = phys(ui->ui_hd, struct uba_hd *)->uh_physuba;
+#if VAX780
+	if (cpu == VAX_780)
+		ubainit(up);
 #endif
+	DELAY(1000000);
+	addr = (struct device *)ui->ui_physaddr;
+	tmwait(addr);
+	addr->tmcs = TM_DCLR | TM_GO;
 	while (num > 0) {
 		blk = num > DBSIZE ? DBSIZE : num;
-		tmdwrite(start, blk);
+		tmdwrite(start, blk, addr, up);
 		start += blk;
 		num -= blk;
 	}
-	((struct uba_regs *)PHYSUBA0)->uba_dpr[1] |= BNE;
+	tmeof(addr);
+	tmeof(addr);
+	tmwait(addr);
+	if (addr->tmcs&TM_ERR)
+		return (EIO);
+	addr->tmcs = TM_REW | TM_GO;
+	tmwait(addr);
+	return (0);
 }
 
-tmdwrite(buf, num)
-register buf, num;
+tmdwrite(dbuf, num, addr, up)
+	register dbuf, num;
+	register struct device *addr;
+	struct uba_regs *up;
 {
-	register int *io, npf;
+	register struct pte *io;
+	register int npf;
 
-	tmwait();
-	((struct uba_regs *)PHYSUBA0)->uba_dpr[1] |= BNE;
-	io = (int *)((struct uba_regs *)PHYSUBA0)->uba_map;
+	tmwait(addr);
+	io = up->uba_map;
 	npf = num+1;
 	while (--npf != 0)
-		 *io++ = (int)(buf++ | (1<<21) | MRV);
-	*io = 0;
-	TMPHYS->tmbc = -(num*NBPG);
-	TMPHYS->tmba = 0;
-	TMPHYS->tmcs = WCOM | GO | D800;
+		 *(int *)io++ = (dbuf++ | (1<<UBA_DPSHIFT) | UBA_MRV);
+	*(int *)io = 0;
+	addr->tmbc = -(num*NBPG);
+	addr->tmba = 0;
+	addr->tmcs = TM_WCOM | TM_GO;
 }
 
-tmwait()
+tmwait(addr)
+	register struct device *addr;
 {
 	register s;
 
 	do
-		s = TMPHYS->tmcs;
-	while ((s & CUR) == 0);
-}
-
-tmrewind()
-{
-
-	tmwait();
-	TMPHYS->tmcs = REW | GO;
+		s = addr->tmcs;
+	while ((s & TM_CUR) == 0);
 }
 
-tmeof()
+tmeof(addr)
+	struct device *addr;
 {
 
-	tmwait();
-	TMPHYS->tmcs = WEOF | GO | D800;
+	tmwait(addr);
+	addr->tmcs = TM_WEOF | TM_GO;
 }
 #endif