+/* tm.c 6.3 83/09/25 */
+
+#include "te.h"
+#include "ts.h"
+#if NTE > 0
+/*
+ * TM11/TE10 tape driver
+ *
+ * TODO:
+ * test driver with more than one slave
+ * test driver with more than one controller
+ * test reset code
+ * what happens if you offline tape during rewind?
+ * test using file system on tape
+ */
+#include "../machine/pte.h"
+
+#include "../h/param.h"
+#include "../h/systm.h"
+#include "../h/buf.h"
+#include "../h/dir.h"
+#include "../h/conf.h"
+#include "../h/user.h"
+#include "../h/file.h"
+#include "../h/map.h"
+#include "../h/vm.h"
+#include "../h/ioctl.h"
+#include "../h/mtio.h"
+#include "../h/cmap.h"
+#include "../h/uio.h"
+#include "../h/kernel.h"
+
+#include "../vax/cpu.h"
+#include "../vaxuba/ubareg.h"
+#include "../vaxuba/ubavar.h"
+#include "../vaxuba/tmreg.h"
+
+/*
+ * There is a ctmbuf per tape controller.
+ * It is used as the token to pass to the internal routines
+ * to execute tape ioctls, and also acts as a lock on the slaves
+ * on the controller, since there is only one per controller.
+ * In particular, when the tape is rewinding on close we release
+ * the user process but any further attempts to use the tape drive
+ * before the rewind completes will hang waiting for ctmbuf.
+ */
+struct buf ctmbuf[NTM];
+
+/*
+ * Raw tape operations use rtmbuf. The driver
+ * notices when rtmbuf is being used and allows the user
+ * program to continue after errors and read records
+ * not of the standard length (BSIZE).
+ */
+struct buf rtmbuf[NTM];
+
+/*
+ * Driver unibus interface routines and variables.
+ */
+int tmprobe(), tmslave(), tmattach(), tmdgo(), tmintr();
+struct uba_ctlr *tmminfo[NTM];
+struct uba_device *tedinfo[NTE];
+struct buf teutab[NTE];
+short tetotm[NTE];
+u_short tmstd[] = { 0772520, 0 };
+struct uba_driver tmdriver =
+ { tmprobe, tmslave, tmattach, tmdgo, tmstd, "te", tedinfo, "tm", tmminfo, 0 };
+
+/* bits in minor device */
+#define TEUNIT(dev) (minor(dev)&03)
+#define TMUNIT(dev) (tetotm[TEUNIT(dev)])
+#define T_NOREWIND 04
+#define T_1600BPI 08
+
+#define INF (daddr_t)1000000L
+
+/*
+ * Software state per tape transport.
+ *
+ * 1. A tape drive is a unique-open device; we refuse opens when it is already.
+ * 2. We keep track of the current position on a block tape and seek
+ * before operations by forward/back spacing if necessary.
+ * 3. We remember if the last operation was a write on a tape, so if a tape
+ * is open read write and the last thing done is a write we can
+ * write a standard end of tape mark (two eofs).
+ * 4. We remember the status registers after the last command, using
+ * then internally and returning them to the SENSE ioctl.
+ * 5. We remember the last density the tape was used at. If it is
+ * not a BOT when we start using it and we are writing, we don't
+ * let the density be changed.
+ */
+struct te_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; /* position of end of tape, if known */
+ u_short sc_erreg; /* copy of last erreg */
+ u_short sc_dsreg; /* copy of last dsreg */
+ short sc_resid; /* copy of last bc */
+#ifdef unneeded
+ short sc_lastcmd; /* last command to handle direction changes */
+#endif
+ u_short sc_dens; /* prototype command with density info */
+ daddr_t sc_timo; /* time until timeout expires */
+ short sc_tact; /* timeout is active */
+} te_softc[NTE];
+#ifdef unneeded
+int tmgapsdcnt; /* DEBUG */
+#endif
+
+/*
+ * States for um->um_tab.b_active, the per controller state flag.
+ * This is used to sequence control in the driver.
+ */
+#define SSEEK 1 /* seeking */
+#define SIO 2 /* doing seq i/o */
+#define SCOM 3 /* sending control command */
+#define SREW 4 /* sending a drive rewind */
+
+/*
+ * 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; /* must be r11,r10; value-result */
+
+#ifdef lint
+ br = 0; cvec = br; br = cvec;
+ tmintr(0);
+#endif
+ ((struct tmdevice *)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((caddr_t)&((struct tmdevice *)reg)->tmrd, 2))
+ return (0);
+ return (sizeof (struct tmdevice));
+}
+
+/*
+ * 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_device *ui;
+ caddr_t reg;
+{
+
+ return (1);
+}
+
+/*
+ * Record attachment of the unit to the controller.
+ */
+/*ARGSUSED*/
+tmattach(ui)
+ struct uba_device *ui;
+{
+ /*
+ * Tetotm is used in TMUNIT to index the ctmbuf and rtmbuf
+ * arrays given a te unit number.
+ */
+ tetotm[ui->ui_unit] = ui->ui_mi->um_ctlr;
+}
+
+int tmtimer();
+/*
+ * 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; if you want to wait
+ * for a tape you should timeout in user code.
+ */
+tmopen(dev, flag)
+ dev_t dev;
+ int flag;
+{
+ register int teunit;
+ register struct uba_device *ui;
+ register struct te_softc *sc;
+ int olddens, dens;
+ int s;
+
+ teunit = TEUNIT(dev);
+ if (teunit>=NTE || (sc = &te_softc[teunit])->sc_openf ||
+ (ui = tedinfo[teunit]) == 0 || ui->ui_alive == 0)
+ return (ENXIO);
+ olddens = sc->sc_dens;
+ dens = TM_IE | TM_GO | (ui->ui_slave << 8);
+ if ((minor(dev) & T_1600BPI) == 0)
+ dens |= TM_D800;
+ sc->sc_dens = dens;
+get:
+ tmcommand(dev, TM_SENSE, 1);
+ if (sc->sc_erreg&TMER_SDWN) {
+ sleep((caddr_t)&lbolt, PZERO+1);
+ goto get;
+ }
+ sc->sc_dens = olddens;
+ if ((sc->sc_erreg&(TMER_SELR|TMER_TUR)) != (TMER_SELR|TMER_TUR)) {
+ uprintf("te%d: not online\n", teunit);
+ return (EIO);
+ }
+ if ((flag&FWRITE) && (sc->sc_erreg&TMER_WRL)) {
+ uprintf("te%d: no write ring\n", teunit);
+ return (EIO);
+ }
+ if ((sc->sc_erreg&TMER_BOT) == 0 && (flag&FWRITE) &&
+ dens != sc->sc_dens) {
+ uprintf("te%d: can't change density in mid-tape\n", teunit);
+ return (EIO);
+ }
+ sc->sc_openf = 1;
+ sc->sc_blkno = (daddr_t)0;
+ sc->sc_nxrec = INF;
+ sc->sc_lastiow = 0;
+ sc->sc_dens = dens;
+ s = spl6();
+ if (sc->sc_tact == 0) {
+ sc->sc_timo = INF;
+ sc->sc_tact = 1;
+ timeout(tmtimer, (caddr_t)dev, 5*hz);
+ }
+ splx(s);
+ return (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 te_softc *sc = &te_softc[TEUNIT(dev)];
+
+ 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)
+ /*
+ * 0 count means don't hang waiting for rewind complete
+ * rather ctmbuf stays busy until the operation completes
+ * preventing further opens from completing by
+ * preventing a TM_SENSE from completing.
+ */
+ tmcommand(dev, TM_REW, 0);
+ sc->sc_openf = 0;
+}
+
+/*
+ * 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;
+ register int s;
+
+ bp = &ctmbuf[TMUNIT(dev)];
+ s = spl5();
+ while (bp->b_flags&B_BUSY) {
+ /*
+ * This special check is because B_BUSY never
+ * gets cleared in the non-waiting rewind case.
+ */
+ 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_repcnt = -count;
+ bp->b_command = com;
+ bp->b_blkno = 0;
+ tmstrategy(bp);
+ /*
+ * In case of rewind from close, don't wait.
+ * This is the only case where count can be 0.
+ */
+ if (count == 0)
+ return;
+ iowait(bp);
+ if (bp->b_flags&B_WANTED)
+ wakeup((caddr_t)bp);
+ bp->b_flags &= B_ERROR;
+}
+
+/*
+ * Queue a tape operation.
+ */
+tmstrategy(bp)
+ register struct buf *bp;
+{
+ int teunit = TEUNIT(bp->b_dev);
+ register struct uba_ctlr *um;
+ register struct buf *dp;
+ int s;
+
+ /*
+ * Put transfer at end of unit queue
+ */
+ dp = &teutab[teunit];
+ bp->av_forw = NULL;
+ s = spl5();
+ um = tedinfo[teunit]->ui_mi;
+ if (dp->b_actf == NULL) {
+ dp->b_actf = bp;
+ /*
+ * Transport not already active...
+ * put at end of controller queue.
+ */
+ 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;
+ } 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);
+ splx(s);
+}
+
+/*
+ * Start activity on a tm controller.
+ */
+tmstart(um)
+ register struct uba_ctlr *um;
+{
+ register struct buf *bp, *dp;
+ register struct tmdevice *addr = (struct tmdevice *)um->um_addr;
+ register struct te_softc *sc;
+ register struct uba_device *ui;
+ int teunit, cmd;
+ daddr_t blkno;
+
+ /*
+ * Look for an idle transport on the controller.
+ */
+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;
+ }
+ teunit = TEUNIT(bp->b_dev);
+ ui = tedinfo[teunit];
+ /*
+ * Record pre-transfer status (e.g. for TM_SENSE)
+ */
+ sc = &te_softc[teunit];
+ addr = (struct tmdevice *)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 = 0;
+ if (sc->sc_openf < 0 || (addr->tmcs&TM_CUR) == 0) {
+ /*
+ * Have had a hard error on a non-raw tape
+ * or the tape unit is now unavailable
+ * (e.g. taken off line).
+ */
+ bp->b_flags |= B_ERROR;
+ goto next;
+ }
+ if (bp == &ctmbuf[TMUNIT(bp->b_dev)]) {
+ /*
+ * Execute control operation with the specified count.
+ */
+ if (bp->b_command == TM_SENSE)
+ goto next;
+ /*
+ * Set next state; give 5 minutes to complete
+ * rewind, or 10 seconds per iteration (minimum 60
+ * seconds and max 5 minutes) to complete other ops.
+ */
+ if (bp->b_command == TM_REW) {
+ um->um_tab.b_active = SREW;
+ sc->sc_timo = 5 * 60;
+ } else {
+ um->um_tab.b_active = SCOM;
+ sc->sc_timo =
+ imin(imax(10*(int)-bp->b_repcnt,60),5*60);
+ }
+ if (bp->b_command == TM_SFORW || bp->b_command == TM_SREV)
+ addr->tmbc = bp->b_repcnt;
+ goto dobpcmd;
+ }
+ /*
+ * The following checks handle boundary cases for operation
+ * on non-raw tapes. On raw tapes the initialization of
+ * sc->sc_nxrec by tmphys causes them to be skipped normally
+ * (except in the case of retries).
+ */
+ if (bdbtofsb(bp->b_blkno) > sc->sc_nxrec) {
+ /*
+ * Can't read past known end-of-file.
+ */
+ bp->b_flags |= B_ERROR;
+ bp->b_error = ENXIO;
+ goto next;
+ }
+ if (bdbtofsb(bp->b_blkno) == sc->sc_nxrec &&
+ bp->b_flags&B_READ) {
+ /*
+ * Reading at end of file returns 0 bytes.
+ */
+ bp->b_resid = bp->b_bcount;
+ clrbuf(bp);
+ goto next;
+ }
+ if ((bp->b_flags&B_READ) == 0)
+ /*
+ * Writing sets EOF
+ */
+ sc->sc_nxrec = bdbtofsb(bp->b_blkno) + 1;
+ /*
+ * 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) == bdbtofsb(bp->b_blkno)) {
+ addr->tmbc = -bp->b_bcount;
+ if ((bp->b_flags&B_READ) == 0) {
+ if (um->um_tab.b_errcnt)
+ cmd = TM_WIRG;
+ else
+ cmd = TM_WCOM;
+ } else
+ cmd = TM_RCOM;
+ um->um_tab.b_active = SIO;
+ um->um_cmd = sc->sc_dens|cmd;
+#ifdef notdef
+ if (tmreverseop(sc->sc_lastcmd))
+ while (addr->tmer & TMER_SDWN)
+ tmgapsdcnt++;
+ sc->sc_lastcmd = TM_RCOM; /* will serve */
+#endif
+ sc->sc_timo = 60; /* premature, but should serve */
+ (void) ubago(ui);
+ return;
+ }
+ /*
+ * Tape positioned incorrectly;
+ * set to seek forwards or backwards to the correct spot.
+ * This happens for raw tapes only on error retries.
+ */
+ um->um_tab.b_active = SSEEK;
+ if (blkno < bdbtofsb(bp->b_blkno)) {
+ bp->b_command = TM_SFORW;
+ addr->tmbc = blkno - bdbtofsb(bp->b_blkno);
+ } else {
+ bp->b_command = TM_SREV;
+ addr->tmbc = bdbtofsb(bp->b_blkno) - blkno;
+ }
+ sc->sc_timo = imin(imax(10 * -addr->tmbc, 60), 5 * 60);
+dobpcmd:
+#ifdef notdef
+ /*
+ * It is strictly necessary to wait for the tape
+ * to stop before changing directions, but the TC11
+ * handles this for us.
+ */
+ if (tmreverseop(sc->sc_lastcmd) != tmreverseop(bp->b_command))
+ while (addr->tmer & TM_SDWN)
+ tmgapsdcnt++;
+ sc->sc_lastcmd = bp->b_command;
+#endif
+ /*
+ * Do the command in bp.
+ */
+ addr->tmcs = (sc->sc_dens | bp->b_command);
+ return;
+
+next:
+ /*
+ * 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;
+}
+
+/*
+ * The UNIBUS resources we needed have been
+ * allocated to us; start the device.
+ */
+tmdgo(um)
+ register struct uba_ctlr *um;
+{
+ register struct tmdevice *addr = (struct tmdevice *)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_ctlr *um = tmminfo[tm11];
+ register struct tmdevice *addr;
+ register struct te_softc *sc;
+ int teunit;
+ register state;
+
+ if ((dp = um->um_tab.b_actf) == NULL)
+ return;
+ bp = dp->b_actf;
+ teunit = TEUNIT(bp->b_dev);
+ addr = (struct tmdevice *)tedinfo[teunit]->ui_addr;
+ sc = &te_softc[teunit];
+ /*
+ * 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&TMER_RWS) {
+ sc->sc_timo = 5*60; /* 5 minutes */
+ return;
+ }
+ }
+ /*
+ * An operation completed... record status
+ */
+ sc->sc_timo = INF;
+ sc->sc_dsreg = addr->tmcs;
+ sc->sc_erreg = addr->tmer;
+ sc->sc_resid = addr->tmbc;
+ if ((bp->b_flags & B_READ) == 0)
+ 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 & TMER_SDWN)
+ ; /* await settle down */
+ /*
+ * If we hit the end of the tape file, update our position.
+ */
+ if (addr->tmer&TMER_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 we were reading raw tape and the only error was that the
+ * record was too long, then we don't consider this an error.
+ */
+ if (bp == &rtmbuf[TMUNIT(bp->b_dev)] && (bp->b_flags&B_READ) &&
+ (addr->tmer&(TMER_HARD|TMER_SOFT)) == TMER_RLE)
+ goto ignoreerr;
+ /*
+ * If error is not hard, and this was an i/o operation
+ * retry up to 8 times.
+ */
+ if ((addr->tmer&TMER_HARD)==0 && state==SIO) {
+ if (++um->um_tab.b_errcnt < 7) {
+ sc->sc_blkno++;
+ ubadone(um);
+ goto opcont;
+ }
+ } else
+ /*
+ * Hard or non-i/o errors on non-raw tape
+ * cause it to close.
+ */
+ if (sc->sc_openf>0 && bp != &rtmbuf[TMUNIT(bp->b_dev)])
+ 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, TMER_BITS);
+ bp->b_flags |= B_ERROR;
+ goto opdone;
+ }
+ /*
+ * Advance tape control FSM.
+ */
+ignoreerr:
+ switch (state) {
+
+ case SIO:
+ /*
+ * Read/write increments tape block number
+ */
+ sc->sc_blkno++;
+ goto opdone;
+
+ case SCOM:
+ /*
+ * For forward/backward space record update current position.
+ */
+ if (bp == &ctmbuf[TMUNIT(bp->b_dev)])
+ switch (bp->b_command) {
+
+ case TM_SFORW:
+ sc->sc_blkno -= bp->b_repcnt;
+ break;
+
+ case TM_SREV:
+ sc->sc_blkno += bp->b_repcnt;
+ break;
+ }
+ goto opdone;
+
+ case SSEEK:
+ sc->sc_blkno = bdbtofsb(bp->b_blkno);
+ goto opcont;
+
+ default:
+ panic("tmintr");
+ }
+opdone:
+ /*
+ * Reset error count and remove
+ * from device queue.
+ */
+ um->um_tab.b_errcnt = 0;
+ dp->b_actf = bp->av_forw;
+ /*
+ * Check resid; watch out for resid >32767 (tmbc not negative).
+ */
+ bp->b_resid = ((int) -addr->tmbc) & 0xffff;
+ 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;
+ }
+ if (um->um_tab.b_actf == 0)
+ return;
+opcont:
+ tmstart(um);
+}
+
+tmtimer(dev)
+ int dev;
+{
+ register struct te_softc *sc = &te_softc[TEUNIT(dev)];
+ register short x;
+
+ if (sc->sc_timo != INF && (sc->sc_timo -= 5) < 0) {
+ printf("te%d: lost interrupt\n", TEUNIT(dev));
+ sc->sc_timo = INF;
+ x = spl5();
+ tmintr(TMUNIT(dev));
+ (void) splx(x);
+ }
+ timeout(tmtimer, (caddr_t)dev, 5*hz);
+}
+
+tmseteof(bp)
+ register struct buf *bp;
+{
+ register int teunit = TEUNIT(bp->b_dev);
+ register struct tmdevice *addr =
+ (struct tmdevice *)tedinfo[teunit]->ui_addr;
+ register struct te_softc *sc = &te_softc[teunit];
+
+ if (bp == &ctmbuf[TMUNIT(bp->b_dev)]) {
+ if (sc->sc_blkno > bdbtofsb(bp->b_blkno)) {
+ /* reversing */
+ sc->sc_nxrec = bdbtofsb(bp->b_blkno) - addr->tmbc;
+ sc->sc_blkno = sc->sc_nxrec;
+ } else {
+ /* spacing forward */
+ sc->sc_blkno = bdbtofsb(bp->b_blkno) + addr->tmbc;
+ sc->sc_nxrec = sc->sc_blkno - 1;
+ }
+ return;
+ }
+ /* eof on read */
+ sc->sc_nxrec = bdbtofsb(bp->b_blkno);
+}
+
+tmread(dev, uio)
+ dev_t dev;
+ struct uio *uio;
+{
+ int errno;
+
+ errno = tmphys(dev, uio);
+ if (errno)
+ return (errno);
+ return (physio(tmstrategy, &rtmbuf[TMUNIT(dev)], dev, B_READ, minphys, uio));
+}
+
+tmwrite(dev, uio)
+ dev_t dev;
+ struct uio *uio;
+{
+ int errno;
+
+ errno = tmphys(dev, uio);
+ if (errno)
+ return (errno);
+ return (physio(tmstrategy, &rtmbuf[TMUNIT(dev)], dev, B_WRITE, minphys, uio));
+}
+
+/*
+ * Check that a raw device exists.
+ * If it does, set up sc_blkno and sc_nxrec
+ * so that the tape will appear positioned correctly.
+ */
+tmphys(dev, uio)
+ dev_t dev;
+ struct uio *uio;
+{
+ register int teunit = TEUNIT(dev);
+ register daddr_t a;
+ register struct te_softc *sc;
+ register struct uba_device *ui;
+
+ if (teunit >= NTE || (ui=tedinfo[teunit]) == 0 || ui->ui_alive == 0)
+ return (ENXIO);
+ sc = &te_softc[teunit];
+ a = bdbtofsb(uio->uio_offset >> 9);
+ sc->sc_blkno = a;
+ sc->sc_nxrec = a + 1;
+ return (0);
+}
+
+tmreset(uban)
+ int uban;
+{
+ register struct uba_ctlr *um;
+ register tm11, teunit;
+ register struct uba_device *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);
+ um->um_ubinfo = 0;
+ }
+ ((struct tmdevice *)(um->um_addr))->tmcs = TM_DCLR;
+ for (teunit = 0; teunit < NTE; teunit++) {
+ if ((ui = tedinfo[teunit]) == 0 || ui->ui_mi != um ||
+ ui->ui_alive == 0)
+ continue;
+ dp = &teutab[teunit];
+ 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;
+ if (te_softc[teunit].sc_openf > 0)
+ te_softc[teunit].sc_openf = -1;
+ }
+ tmstart(um);
+ }
+}
+
+/*ARGSUSED*/
+tmioctl(dev, cmd, data, flag)
+ caddr_t data;
+ dev_t dev;
+{
+ int teunit = TEUNIT(dev);
+ register struct te_softc *sc = &te_softc[teunit];
+ register struct buf *bp = &ctmbuf[TMUNIT(dev)];
+ register callcount;
+ int fcount;
+ struct mtop *mtop;
+ struct mtget *mtget;
+ /* we depend of the values and order of the MT codes here */
+ static tmops[] =
+ {TM_WEOF,TM_SFORW,TM_SREV,TM_SFORW,TM_SREV,TM_REW,TM_OFFL,TM_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: case MTNOP:
+ callcount = 1;
+ fcount = 1;
+ break;
+
+ default:
+ return (ENXIO);
+ }
+ if (callcount <= 0 || fcount <= 0)
+ return (EINVAL);
+ while (--callcount >= 0) {
+ tmcommand(dev, tmops[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_erreg&TMER_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_ISTM;
+ break;
+
+ default:
+ return (ENXIO);
+ }
+ return (0);
+}
+
+#define DBSIZE 20
+
+tmdump()
+{
+ register struct uba_device *ui;
+ register struct uba_regs *up;
+ register struct tmdevice *addr;
+ int blk, num;
+ int start;
+
+ start = 0;
+ num = maxfree;
+#define phys(a,b) ((b)((int)(a)&0x7fffffff))
+ if (tedinfo[0] == 0)
+ return (ENXIO);
+ ui = phys(tedinfo[0], struct uba_device *);
+ up = phys(ui->ui_hd, struct uba_hd *)->uh_physuba;
+ ubainit(up);
+ DELAY(1000000);
+ addr = (struct tmdevice *)ui->ui_physaddr;
+ tmwait(addr);
+ addr->tmcs = TM_DCLR | TM_GO;
+ while (num > 0) {
+ blk = num > DBSIZE ? DBSIZE : num;
+ tmdwrite(start, blk, addr, up);
+ start += blk;
+ num -= blk;
+ }
+ tmeof(addr);
+ tmeof(addr);
+ tmwait(addr);
+ if (addr->tmcs&TM_ERR)
+ return (EIO);
+ addr->tmcs = TM_REW | TM_GO;
+ tmwait(addr);
+ return (0);
+}
+
+tmdwrite(dbuf, num, addr, up)
+ register dbuf, num;
+ register struct tmdevice *addr;
+ struct uba_regs *up;
+{
+ register struct pte *io;
+ register int npf;
+
+ tmwait(addr);
+ io = up->uba_map;
+ npf = num+1;
+ while (--npf != 0)
+ *(int *)io++ = (dbuf++ | (1<<UBAMR_DPSHIFT) | UBAMR_MRV);
+ *(int *)io = 0;
+ addr->tmbc = -(num*NBPG);
+ addr->tmba = 0;
+ addr->tmcs = TM_WCOM | TM_GO;
+}
+
+tmwait(addr)
+ register struct tmdevice *addr;
+{
+ register s;
+
+ do
+ s = addr->tmcs;
+ while ((s & TM_CUR) == 0);
+}
+
+tmeof(addr)
+ struct tmdevice *addr;
+{
+
+ tmwait(addr);
+ addr->tmcs = TM_WEOF | TM_GO;
+}
+#endif
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