use shorts to move data

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

diff --git a/usr/src/sys/vax/mba/ht.c b/usr/src/sys/vax/mba/ht.c
index 443ac16..7cd25ba 100644 (file)
--- a/usr/src/sys/vax/mba/ht.c
+++ b/usr/src/sys/vax/mba/ht.c
@@ -1,9 +1,16 @@
-/*     ht.c    3.3     %H%     */
+/*     ht.c    4.22    82/05/12        */

 
 

+#include "tu.h"
+#if NHT > 0

 /*
 /*

- * TJU16 tape driver
+ * 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 "../h/param.h"
 #include "../h/systm.h"
 #include "../h/buf.h"
 #include "../h/param.h"
 #include "../h/systm.h"
 #include "../h/buf.h"


@@ -12,339 +19,577 @@
 #include "../h/file.h"
 #include "../h/user.h"
 #include "../h/map.h"
 #include "../h/file.h"
 #include "../h/user.h"
 #include "../h/map.h"

-#include "../h/mba.h"
+#include "../h/pte.h"
+#include "../h/mbareg.h"
+#include "../h/mbavar.h"
+#include "../h/mtio.h"
+#include "../h/ioctl.h"
+#include "../h/cmap.h"
+#include "../h/cpu.h"
+
+#include "../h/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 */

 
 

-struct device
+char   hter_bits[] = HTER_BITS;
+char   htds_bits[] = HTDS_BITS;
+
+/*ARGSUSED*/
+htattach(mi)
+       struct mba_device *mi;

 {
 {

-       int     htcs1;
-       int     htds;
-       int     hter;
-       int     htmr;
-       int     htas;
-       int     htfc;
-       int     htdt;
-       int     htck;
-       int     htsn;
-       int     httc;
-};
-
-struct buf     httab;
-struct buf     rhtbuf;
-struct buf     chtbuf;
-
-#define        NUNIT   1
-#define        BUNIT   2
-#define        INF     1000000
-
-char   h_openf[NUNIT];
-daddr_t        h_blkno[NUNIT];
-char   h_flags[NUNIT];
-daddr_t        h_nxrec[NUNIT];
-
-#define        HTADDR  ((struct device *)(MBA1 + MBA_ERB))
-
-#define        GO      01
-#define        WCOM    060
-#define        RCOM    070
-#define        NOP     0
-#define        WEOF    026
-#define        SFORW   030
-#define        SREV    032
-#define        ERASE   024
-#define        REW     06
-#define        DCLR    010
-#define        P800    01700           /* 800 + pdp11 mode */
-#define        P1600   02300           /* 1600 + pdp11 mode */
-#define        IENABLE 0100
-#define        RDY     0200
-#define        TM      04
-#define        DRY     0200
-#define        EOT     02000
-#define        CS      02000
-#define        COR     0100000
-#define        PES     040
-#define        WRL     04000
-#define        MOL     010000
-#define        ERR     040000
-#define        FCE     01000
-#define        TRE     040000
-#define        HARD    064023  /* UNS|OPI|NEF|FMT|RMR|ILR|ILF */
-
-#define        SIO     1
-#define        SSFOR   2
-#define        SSREV   3
-#define        SRETRY  4
-#define        SCOM    5
-#define        SOK     6
-
-#define        H_WRITTEN 1

 
 

-htopen(dev, flag)
+}
+
+htslave(mi, ms)
+       struct mba_device *mi;
+       struct mba_slave *ms;

 {
 {

-       register unit, ds;
+       register struct tu_softc *sc = &tu_softc[ms->ms_unit];
+       register struct htdevice *htaddr = (struct htdevice *)mi->mi_drv;
+
+       htaddr->httc = ms->ms_slave;
+       if (htaddr->htdt & HTDT_SPR) {
+               sc->sc_mi = mi;
+               sc->sc_slave = ms->ms_slave;
+               tutoht[ms->ms_unit] = mi->mi_unit;
+               return (1);
+       } else
+               return (0);
+}

 
 

-       httab.b_flags |= B_TAPE;
-       unit = minor(dev) & 03;
-       if (unit >= NUNIT || h_openf[unit]) {
+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) {

                u.u_error = ENXIO;
                return;
        }
                u.u_error = ENXIO;
                return;
        }

-       h_blkno[unit] = 0;
-       h_nxrec[unit] = INF;
-       h_flags[unit] = 0;
-       ds = hcommand(dev, NOP);
-       if ((ds&MOL)==0 || (flag && (ds&WRL)))
-               u.u_error = ENXIO;
-       if (u.u_error==0)
-               h_openf[unit]++;
+       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);
+               u.u_error = EIO;
+               return;
+       }
+       if ((flag&FWRITE) && (sc->sc_dsreg&HTDS_WRL)) {
+               uprintf("tu%d: no write ring\n", tuunit);
+               u.u_error = EIO;
+               return;
+       }
+       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);
+               u.u_error = EIO;
+               return;
+       }
+       sc->sc_openf = 1;
+       sc->sc_blkno = (daddr_t)0;
+       sc->sc_nxrec = INF;
+       sc->sc_flags = 0;
+       sc->sc_dens = dens;

 }
 
 htclose(dev, flag)
 }
 
 htclose(dev, flag)

+       register dev_t dev;
+       register flag;

 {
 {

-       register int unit;
+       register struct tu_softc *sc = &tu_softc[TUUNIT(dev)];

 
 

-       unit = minor(dev) & 03;
-       if (flag == FWRITE || ((flag&FWRITE) && (h_flags[unit]&H_WRITTEN))) {
-               (void) hcommand(dev, WEOF);
-               (void) hcommand(dev, WEOF);
-               (void) hcommand(dev, SREV);
+       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)&4) == 0) /* no 4 -> rewind */
-               (void) hcommand(dev, REW);
-       h_openf[unit] = 0;
+       if ((minor(dev)&H_NOREWIND) == 0)
+               htcommand(dev, HT_REW, 0);
+       sc->sc_openf = 0;

 }
 
 }
 

-hcommand(dev, com)
+htcommand(dev, com, count)
+       dev_t dev;
+       int com, count;

 {
        register struct buf *bp;
 {
        register struct buf *bp;

+       register int s;

 
 

-       bp = &chtbuf;
-       (void) spl5();
-       while(bp->b_flags&B_BUSY) {
+       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_WANTED;
                sleep((caddr_t)bp, PRIBIO);
        }

-       (void) spl0();
+       bp->b_flags = B_BUSY|B_READ;
+       splx(s);

        bp->b_dev = dev;
        bp->b_dev = dev;

-       bp->b_resid = com;
+       bp->b_command = com;
+       bp->b_repcnt = count;

        bp->b_blkno = 0;
        bp->b_blkno = 0;

-       bp->b_flags = B_BUSY|B_READ;

        htstrategy(bp);
        htstrategy(bp);

+       if (count == 0)
+               return;

        iowait(bp);
        iowait(bp);

-       if(bp->b_flags&B_WANTED)
+       if (bp->b_flags&B_WANTED)

                wakeup((caddr_t)bp);
                wakeup((caddr_t)bp);

-       bp->b_flags = 0;
-       return(bp->b_resid);
+       bp->b_flags &= B_ERROR;

 }
 
 htstrategy(bp)
 }
 
 htstrategy(bp)

-register struct buf *bp;
+       register struct buf *bp;

 {
 {

-       register daddr_t *p;
+       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);
+}

 
 

-       if(bp != &chtbuf) {
-               p = &h_nxrec[minor(bp->b_dev)&03];
-               if(dbtofsb(bp->b_blkno) > *p) {
+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;
+       if (bp == &chtbuf[HTUNIT(bp->b_dev)] && bp->b_command == HT_SENSE) {
+               htaddr->htcs1 = HT_SENSE|HT_GO;
+               mbclrattn(mi);
+       }
+       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 (dbtofsb(bp->b_blkno) > sc->sc_nxrec) {

                        bp->b_flags |= B_ERROR;
                        bp->b_error = ENXIO;
                        bp->b_flags |= B_ERROR;
                        bp->b_error = ENXIO;

-                       iodone(bp);
-                       return;
+                       return (MBU_NEXT);

                }
                }

-               if(dbtofsb(bp->b_blkno) == *p && bp->b_flags&B_READ) {
+               if (dbtofsb(bp->b_blkno) == sc->sc_nxrec &&
+                   bp->b_flags&B_READ) {

                        bp->b_resid = bp->b_bcount;
                        clrbuf(bp);
                        bp->b_resid = bp->b_bcount;
                        clrbuf(bp);

-                       iodone(bp);
-                       return;
+                       return (MBU_NEXT);

                }
                }

-               if ((bp->b_flags&B_READ)==0) {
-                       *p = dbtofsb(bp->b_blkno) + 1;
-                       h_flags[minor(bp->b_dev)&03] |=  H_WRITTEN;
+               if ((bp->b_flags&B_READ)==0)
+                       sc->sc_nxrec = dbtofsb(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) == dbtofsb(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);

        }
        }

-       bp->av_forw = NULL;
-       (void) spl5();
-       if (httab.b_actf == NULL)
-               httab.b_actf = bp;
-       else
-               httab.b_actl->av_forw = bp;
-       httab.b_actl = bp;
-       if (httab.b_active==0)
-               htstart();
-       (void) spl0();
+       if (blkno < dbtofsb(bp->b_blkno)) {
+               htaddr->htfc = blkno - dbtofsb(bp->b_blkno);
+               htaddr->htcs1 = HT_SFORW|HT_GO;
+       } else {
+               htaddr->htfc = dbtofsb(bp->b_blkno) - blkno;
+               htaddr->htcs1 = HT_SREV|HT_GO;
+       }
+       return (MBU_STARTED);

 }
 
 }
 

-htstart()
+htdtint(mi, mbsr)
+       register struct mba_device *mi;
+       int mbsr;

 {
 {

-       register struct buf *bp;
-       register unit, den;
-       daddr_t blkno;
+       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 = dbtofsb(bp->b_blkno);
+               } else if(bp->b_bcount > MASKREG(htaddr->htfc))
+                       bp->b_resid = bp->b_bcount - MASKREG(htaddr->htfc);
+       return (MBD_DONE);
+}

 
 

-    loop:
-       if ((bp = httab.b_actf) == NULL)
-               return;
-       unit = minor(bp->b_dev);
-       den = P800 | (unit&03);
-       if(unit >= 8)
-               den = P1600 | (unit&03);
-       if((HTADDR->httc&03777) != den)
-               HTADDR->httc = den;
-       unit &= 03;
-       blkno = h_blkno[unit];
-       if (bp == &chtbuf) {
-               if (bp->b_resid==NOP) {
-                       bp->b_resid = HTADDR->htds & 0xffff;
-                       goto next;
+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;

                }
                }

-               httab.b_active = SCOM;
-               HTADDR->htfc = 0;
-               HTADDR->htcs1 = bp->b_resid|GO;
-               return;
+               er &= ~HTER_FCE;
+               if (er == 0)
+                       ds &= ~HTDS_ERR;

        }
        }

-       if (h_openf[unit] < 0 || dbtofsb(bp->b_blkno) > h_nxrec[unit])
-               goto abort;
-       if (blkno == dbtofsb(bp->b_blkno)) {
-               httab.b_active = SIO;
-               HTADDR->htfc = -bp->b_bcount;
-               mbastart(bp, (int *)HTADDR);
-       } else {
-               if (blkno < dbtofsb(bp->b_blkno)) {
-                       httab.b_active = SSFOR;
-                       HTADDR->htfc = blkno - dbtofsb(bp->b_blkno);
-                       HTADDR->htcs1 = SFORW|GO;
+       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 > dbtofsb(bp->b_blkno)) {
+                       sc->sc_nxrec = dbtofsb(bp->b_blkno) - fc;
+                       sc->sc_blkno = sc->sc_nxrec;

                } else {
                } else {

-                       httab.b_active = SSREV;
-                       HTADDR->htfc = dbtofsb(bp->b_blkno) - blkno;
-                       HTADDR->htcs1 = SREV|GO;
+                       sc->sc_blkno = dbtofsb(bp->b_blkno) + fc;
+                       sc->sc_nxrec = sc->sc_blkno - 1;

                }
                }

-       }
-       return;
+       else
+               sc->sc_blkno = dbtofsb(bp->b_blkno);
+       return (MBN_RETRY);
+}

 
 

-    abort:
-       bp->b_flags |= B_ERROR;
+htread(dev)
+       dev_t dev;
+{

 
 

-    next:
-       httab.b_actf = bp->av_forw;
-       iodone(bp);
-       goto loop;
+       htphys(dev);
+       if (u.u_error)
+               return;
+       physio(htstrategy, &rhtbuf[HTUNIT(dev)], dev, B_READ, minphys);

 }
 
 }
 

-/*ARGSUSED*/
-htintr(mbastat, as)
+htwrite(dev)

 {
 {

-       register struct buf *bp;
-       register int unit, state;
-       int err;

 
 

-       if ((bp = httab.b_actf)==NULL)
+       htphys(dev);
+       if (u.u_error)

                return;
                return;

-       unit = minor(bp->b_dev) & 03;
-       state = httab.b_active;
-       httab.b_active = 0;
-       if (HTADDR->htds&(ERR|EOT|TM) || mbastat & MBAEBITS) {
-               err = HTADDR->hter & 0xffff;
-               if ((mbastat & MBAEBITS) || (err&HARD))
-                       state = 0;
-               if (bp == &rhtbuf)
-                       err &= ~FCE;
-               if ((bp->b_flags&B_READ) && (HTADDR->htds&PES))
-                       err &= ~(CS|COR);
-               if(HTADDR->htds&EOT || (HTADDR->htds&MOL)==0) {
-                       if(h_openf[unit])
-                               h_openf[unit] = -1;
-               }
-               else if(HTADDR->htds&TM) {
-                       HTADDR->htfc = 0;
-                       h_nxrec[unit] = dbtofsb(bp->b_blkno);
-                       state = SOK;
+       physio(htstrategy, &rhtbuf[HTUNIT(dev)], dev, B_WRITE, minphys);
+}
+
+htphys(dev)
+       dev_t dev;
+{
+       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) {
+               u.u_error = ENXIO;
+               return;
+       }
+       a = u.u_offset >> 9;
+       sc = &tu_softc[TUUNIT(dev)];
+       sc->sc_blkno = dbtofsb(a);
+       sc->sc_nxrec = dbtofsb(a)+1;
+}
+
+/*ARGSUSED*/
+htioctl(dev, cmd, addr, flag)
+       dev_t dev;
+       int cmd;
+       caddr_t addr;
+       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 */
+               if (copyin((caddr_t)addr, (caddr_t)&mtop, sizeof(mtop))) {
+                       u.u_error = EFAULT;
+                       return;

                }
                }

-               else if(state && err == 0)
-                       state = SOK;
-               if(httab.b_errcnt > 4)
-                       deverror(bp, HTADDR->hter, mbastat);
-               ((struct mba_regs *)MBA1)->mba_cr &= ~MBAIE;
-               HTADDR->htcs1 = DCLR|GO;
-               ((struct mba_regs *)MBA1)->mba_cr |= MBAIE;
-               if (state==SIO && ++httab.b_errcnt < 10) {
-                       httab.b_active = SRETRY;
-                       h_blkno[unit]++;
-                       HTADDR->htfc = -1;
-                       HTADDR->htcs1 = SREV|GO;
+               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:
+                       u.u_error = ENXIO;

                        return;
                }
                        return;
                }

-               if (state!=SOK) {
-                       bp->b_flags |= B_ERROR;
-                       state = SIO;
+               if (callcount <= 0 || fcount <= 0) {
+                       u.u_error = ENXIO;
+                       return;

                }
                }

-       } else if (HTADDR->htcs1 < 0) { /* SC */
-               if(HTADDR->htds & ERR) {
-                       ((struct mba_regs *)MBA1)->mba_cr &= ~MBAIE;
-                       HTADDR->htcs1 = DCLR|GO;
-                       ((struct mba_regs *)MBA1)->mba_cr |= MBAIE;
+               while (--callcount >= 0) {
+                       htcommand(dev, htops[mtop.mt_op], fcount);
+                       if ((mtop.mt_op == MTFSR || mtop.mt_op == MTBSR) &&
+                           bp->b_resid) {
+                               u.u_error = EIO;
+                               break;
+                       }
+                       if ((bp->b_flags&B_ERROR) || sc->sc_dsreg&HTDS_BOT)
+                               break;

                }
                }

+               geterror(bp);
+               return;
+       case MTIOCGET:
+               mtget.mt_dsreg = sc->sc_dsreg;
+               mtget.mt_erreg = sc->sc_erreg;
+               mtget.mt_resid = sc->sc_resid;
+               mtget.mt_type = MT_ISHT;
+               if (copyout((caddr_t)&mtget, addr, sizeof(mtget)))
+                       u.u_error = EFAULT;
+               return;
+       default:
+               u.u_error = ENXIO;

        }
        }

-       switch(state) {
-       case SIO:
-       case SOK:
-               h_blkno[unit]++;
-
-       case SCOM:
-               httab.b_errcnt = 0;
-               httab.b_actf = bp->av_forw;
-               bp->b_resid = - (HTADDR->htfc & 0xffff);
-               if (bp->b_flags & B_READ)
-                       bp->b_resid += bp->b_bcount;
-               iodone(bp);
-               break;
-
-       case SRETRY:
-               if((bp->b_flags&B_READ)==0) {
-                       httab.b_active = SSFOR;
-                       HTADDR->htcs1 = ERASE|GO;
-                       return;
-               }
+}

 
 

-       case SSFOR:
-       case SSREV:
-#define blk dbtofsb(bp->b_blkno)
-               if(HTADDR->htds & TM) {
-                       if(state == SSREV) {
-                               h_nxrec[unit] = blk - (HTADDR->htfc&0xffff);
-                               h_blkno[unit] = h_nxrec[unit];
-                       } else {
-                               h_nxrec[unit] = blk + (HTADDR->htfc&0xffff) - 1;
-                               h_blkno[unit] = blk + (HTADDR->htfc & 0xffff);
-                       }
-               } else
-                       h_blkno[unit] = blk;
-               break;
+#define        DBSIZE  20

 
 

-       default:
-               return;
+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;

        }
        }

-       htstart();
+       hteof(htaddr);
+       hteof(htaddr);
+       htwait(htaddr);
+       if (htaddr->htds&HTDS_ERR)
+               return (EIO);
+       htaddr->htcs1 = HT_REW|HT_GO;
+       return (0);

 }
 
 }
 

-htread(dev)
+htdwrite(dbuf, num, htaddr, mp)
+       register dbuf, num;
+       register struct htdevice *htaddr;
+       struct mba_regs *mp;

 {
 {

-       htphys(dev);
-       physio(htstrategy, &rhtbuf, dev, B_READ, minphys);
+       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;

 }
 
 }
 

-htwrite(dev)
+htwait(htaddr)
+       struct htdevice *htaddr;

 {
 {

-       htphys(dev);
-       physio(htstrategy, &rhtbuf, dev, B_WRITE, minphys);
+       register s;
+
+       do
+               s = htaddr->htds;
+       while ((s & HTDS_DRY) == 0);

 }
 
 }
 

-htphys(dev)
+hteof(htaddr)
+       struct htdevice *htaddr;

 {
 {

-       register unit;
-       daddr_t a;

 
 

-       unit = minor(dev) & 03;
-       if(unit < NUNIT) {
-               a = u.u_offset >> 9;
-               h_blkno[unit] = dbtofsb(a);
-               h_nxrec[unit] = dbtofsb(a)+1;
-       }
+       htwait(htaddr);
+       htaddr->htcs1 = HT_WEOF|HT_GO;

 }
 }

+#endif