# 2.11BSD#431 - /usr/src/sys/pdpuba/tm.c

##### Functions

    tmattach          X
    tmclose           X
    tmcommand         X
    tmintr            X
    tmioctl           X
    tmopen            X
    tmseteof          X
    tmstart           X
    tmstrategy        X
    tmtimer           X

##### Variables

    TMADDR            X
    ctmbuf            X
    te_softc          X
    tmdens            X
    tmtab             X

##### Macros

    INF               X
    SCOM              X
    SIO               X
    SREW              X
    SSEEK             X
    TEDENS            X
    TEUNIT            X
    T_NOREWIND        X

##### struct's

    te_softc          X

       1: /*
       2:  * Copyright (c) 1986 Regents of the University of California.
       3:  * All rights reserved.  The Berkeley software License Agreement
       4:  * specifies the terms and conditions for redistribution.
       5:  *
       6:  *	@(#)tm.c	2.4 (2.11BSD GTE) 1997/4/14
       7:  */
       8:
       9: /*
      10:  * TM11 tape drive
      11:  */
      12:
      13: #include "tm.h"
      14: #if NTM > 0
      15: #include "param.h"
      16: #include "buf.h"
      17: #include "conf.h"
      18: #include "file.h"
      19: #include "user.h"
      20: #include "ioctl.h"
      21: #include "fs.h"
      22: #include "mtio.h"
      23: #include "kernel.h"
      24: #include "systm.h"
      25: #include "tmreg.h"
      26: #include "syslog.h"
      27: #include "map.h"
      28: #include "uba.h"
      29:
      30: struct  tmdevice *TMADDR;
      31:
      32: struct  buf tmtab;
      33: struct  buf ctmbuf;
      34:
      35: /*
      36:  * Software state per tape transport:
      37:  *
      38:  * 1. A tape drive is a unique-open device:  we refuse opens when it is already.
      39:  * 2. We keep track of the current position on a block tape and seek
      40:  *    before operations by forward/back spacing if necessary.
      41:  * 3. We remember if the last operation was a write on a tape, so if a tape
      42:  *    is open read write and the last thing done is a write we can
      43:  *    write a standard end of tape mark (two eofs).
      44:  * 4. We remember the status registers after the last command, using
      45:  *    them internally and returning them to the SENSE ioctl.
      46:  * 5. We remember the last density the tape was used at.  If it is
      47:  *    not a BOT when we start using it and we are writing, we don't
      48:  *    let the density be changed.
      49:  */
      50:
      51: struct te_softc {
      52:     char    sc_openf;
      53:     char    sc_lastiow;
      54:     daddr_t sc_blkno;
      55:     daddr_t sc_nxrec;
      56:     u_short sc_erreg;
      57:     u_short sc_dsreg;
      58:     short   sc_resid;
      59:     u_short sc_dens;
      60:     short   sc_timo;
      61:     short   sc_tact;
      62: } te_softc[NTM];
      63:
      64:
      65: /*
      66:  * States for tmtab.b_active, the state flag.
      67:  * This is used to sequence control in the driver.
      68:  */
      69: #define SSEEK   1
      70: #define SIO 2
      71: #define SCOM    3
      72: #define SREW    4
      73:
      74: /*
      75:  * Bits in minor device.
      76:  */
      77: #define TEUNIT(dev) (minor(dev) & 03)
      78: #define T_NOREWIND  04
      79: #ifdef AVIV
      80: #define TEDENS(dev) ((minor(dev) & 030) >> 3)
      81: #else
      82: #define TEDENS(dev) ((minor(dev) & 010) >> 3)
      83: #endif
      84:
      85: #define INF 32760
      86:
      87: int tmtimer ();
      88:
      89: #ifdef  SOFUB_MAP
      90:     static  int tmsoftmap = -1; /* -1 = OK to check for softmap
      91: 					 *  0 = Never use softmap
      92: 					 *  1 = Always use softmap
      93: 					*/
      94: #endif
      95:
      96: tmattach(addr, unit)
      97: struct tmdevice *addr;
      98: int unit;
      99: {
     100:     /*
     101: 	 * This driver supports only one controller.
     102: 	 */
     103:     if  (unit)
     104:         return(0);
     105: #ifdef  SOFUB_MAP
     106:     if  (!ubmap && tmsoftmap == -1)
     107:         tmsoftmap = 1;
     108: #endif
     109:     TMADDR = addr;
     110:     return(1);
     111: }
     112:
     113: /*
     114:  * Open the device.  Tapes are unique open
     115:  * devices so we refuse if it is already open.
     116:  * We also check that the tape is available and
     117:  * don't block waiting here:  if you want to wait
     118:  * for a tape you should timeout in user code.
     119:  */
     120:
     121: u_short tmdens[4] = { TM_D800, TM_D1600, TM_D6250, TM_D800 };
     122:
     123: tmopen(dev, flag)
     124: register dev_t dev;
     125: {
     126:     int s;
     127:     u_short olddens, dens;
     128:     register teunit = TEUNIT(dev);
     129:     register struct te_softc *sc = &te_softc[teunit];
     130:
     131:     if (teunit >= NTM || TMADDR == (struct tmdevice *) NULL)
     132:         return(ENXIO);
     133:     else if (sc->sc_openf)
     134:         return(EBUSY);
     135:     olddens = sc->sc_dens;
     136:     dens = TM_IE | TM_GO | (teunit << 8) | tmdens[TEDENS(dev)];
     137:     sc->sc_dens = dens;
     138:
     139:     tmtab.b_flags |= B_TAPE;
     140: get:
     141:     tmcommand(dev, TM_SENSE, 1);
     142:     if (sc->sc_erreg & TMER_SDWN) {
     143:         sleep ((caddr_t) &lbolt, PZERO+1);
     144:         goto get;
     145:     }
     146:     sc->sc_dens = olddens;
     147:
     148:     if ((sc->sc_erreg & (TMER_SELR | TMER_TUR)) != (TMER_SELR | TMER_TUR)) {
     149:         uprintf("te%d: not online\n", teunit);
     150:         return(EIO);
     151:     }
     152:     if ((flag & FWRITE) && (sc->sc_erreg & TMER_WRL)) {
     153:         uprintf("te%d: no write ring\n", teunit);
     154:         return(EIO);
     155:     }
     156:     if ((sc->sc_erreg & TMER_BOT) == 0 && (flag & FWRITE) && dens != sc->sc_dens) {
     157:         uprintf("te%d: can't change density in mid-tape\n", teunit);
     158:         return(EIO);
     159:     }
     160:     sc->sc_openf = 1;
     161:     sc->sc_blkno = (daddr_t) 0;
     162:     sc->sc_nxrec = (daddr_t) 65535;
     163:     sc->sc_lastiow = 0;
     164:     sc->sc_dens = dens;
     165:     s = splclock();
     166:     if (sc->sc_tact == 0) {
     167:         sc->sc_timo = INF;
     168:         sc->sc_tact = 1;
     169:         timeout(tmtimer, (caddr_t) dev, 5 * hz);
     170:     }
     171:     splx(s);
     172:     return(0);
     173: }
     174:
     175: /*
     176:  * Close tape device.
     177:  *
     178:  * If tape was open for writing or last operation was
     179:  * a write, then write two EOF's and backspace over the last one.
     180:  * Unless this is a non-rewinding special file, rewind the tape.
     181:  * Make the tape available to others.
     182:  */
     183: tmclose(dev, flag)
     184: register dev_t dev;
     185: register flag;
     186: {
     187:     register struct te_softc *sc = &te_softc[TEUNIT(dev)];
     188:
     189:     if (flag == FWRITE || (flag & FWRITE) && sc->sc_lastiow) {
     190:         tmcommand(dev, TM_WEOF, 1);
     191:         tmcommand(dev, TM_WEOF, 1);
     192:         tmcommand(dev, TM_SREV, 1);
     193:     }
     194:     if ((minor(dev) & T_NOREWIND) == 0)
     195:         /*
     196: 		 * 0 count means don't hang waiting for rewind complete.
     197: 		 * Rather ctmbuf stays busy until the operation completes
     198: 		 * preventing further opens from completing by
     199: 		 * preventing a TM_SENSE from completing.
     200: 		 */
     201:         tmcommand(dev, TM_REW, 0);
     202:     sc->sc_openf = 0;
     203: }
     204:
     205: /*
     206:  * Execute a command on the tape drive
     207:  * a specified number of times.
     208:  */
     209: tmcommand(dev, com, count)
     210: register dev_t dev;
     211: register u_short count;
     212: {
     213:     int s;
     214:     register struct buf *bp;
     215:
     216:     bp = &ctmbuf;
     217:     s = splbio();
     218:     while (bp->b_flags & B_BUSY) {
     219:         /*
     220: 		 * This special check is because B_BUSY never
     221: 		 * gets cleared in the non-waiting rewind case.
     222: 		 */
     223:         if (bp->b_repcnt == 0 && (bp->b_flags & B_DONE))
     224:             break;
     225:         bp->b_flags |= B_WANTED;
     226:         sleep((caddr_t)bp, PRIBIO);
     227:     }
     228:     bp->b_flags = B_BUSY | B_READ;
     229:     splx(s);
     230:     bp->b_dev = dev;
     231:     bp->b_repcnt = -count;
     232:     bp->b_command = com;
     233:     bp->b_blkno = (daddr_t) 0;
     234:     tmstrategy(bp);
     235:     /*
     236: 	 * In case of rewind from close, don't wait.
     237: 	 * This is the only case where count can be 0.
     238: 	 */
     239:     if (count == 0)
     240:         return;
     241:     iowait(bp);
     242:     if (bp->b_flags & B_WANTED)
     243:         wakeup((caddr_t)bp);
     244:     bp->b_flags &= B_ERROR;
     245: }
     246:
     247: /*
     248:  * Queue a tape operation.
     249:  */
     250: tmstrategy(bp)
     251: register struct buf *bp;
     252: {
     253:     register s;
     254:     register struct te_softc *sc = &te_softc[TEUNIT(bp->b_dev)];
     255:
     256: #ifdef  SOFUB_MAP
     257: /*
     258:  * The 'soft' map must be allocated here because the transfer may be (although
     259:  * it very rarely is) going to the buffer cache rather than a user process.
     260:  * This has the side effect that a rewinding tape can keep the 'soft' map busy
     261:  * for a fairly long time.  In practice this is not much of a problem since
     262:  * the main use of 18 bit TM controllers on a 22 bit system is with a PDP-11
     263:  * simulator - in which case there's no tape to wait for.
     264: */
     265:     if  (tmsoftmap == 1)
     266:         {
     267:         if  (sofub_alloc(bp) == 0)
     268:             return;
     269:         }
     270: #endif
     271:     if (bp->b_flags & B_PHYS) {
     272: #ifdef  SOFUB_MAP
     273:         if  (tmsoftmap <= 0)
     274: #endif
     275:         mapalloc(bp);
     276:         sc->sc_blkno = sc->sc_nxrec = dbtofsb(bp->b_blkno);
     277:         sc->sc_nxrec++;
     278:     }
     279:     bp->av_forw = NULL;
     280:     s = splbio();
     281:     if (tmtab.b_actf == NULL)
     282:         tmtab.b_actf = bp;
     283:     else
     284:         tmtab.b_actl->av_forw = bp;
     285:     tmtab.b_actl = bp;
     286:     /*
     287: 	 * If the controller is not busy, get
     288: 	 * it going.
     289: 	 */
     290:     if (tmtab.b_active == 0)
     291:         tmstart();
     292:     splx(s);
     293: }
     294:
     295: tmstart()
     296: {
     297:     daddr_t blkno;
     298:     int cmd, teunit;
     299:     register struct tmdevice *tmaddr = TMADDR;
     300:     register struct buf *bp;
     301:     register struct te_softc *sc;
     302:
     303: loop:
     304:     if ((bp = tmtab.b_actf) == NULL)
     305:         return;
     306:     teunit = TEUNIT(bp->b_dev);
     307:     /*
     308: 	 * Record pre-transfer status (e.g. for TM_SENSE).
     309: 	 */
     310:     sc = &te_softc[teunit];
     311:     tmaddr->tmcs = teunit << 8;
     312:     sc->sc_erreg = tmaddr->tmer;
     313:     sc->sc_dsreg = tmaddr->tmcs;
     314:     sc->sc_resid = tmaddr->tmbc;
     315:     /*
     316: 	 * Default is that the last command was NOT a write command;
     317: 	 * if we do a write command we will notice this in tmintr().
     318: 	 */
     319:     sc->sc_lastiow = 0;
     320:     if (sc->sc_openf < 0 || (tmaddr->tmcs & TM_CUR) == 0) {
     321:         /*
     322: 		 * Have had a hard error on a non-raw tape
     323: 		 * or the tape unit is now unavailable
     324: 		 * (e.g. taken off line).
     325: 		 */
     326:         bp->b_flags |= B_ERROR;
     327:         goto next;
     328:     }
     329:     if (bp == &ctmbuf) {
     330:         /*
     331: 		 * Execute control operation with the specified count.
     332: 		 */
     333:         if (bp->b_command == TM_SENSE) {
     334:             goto next;
     335:         }
     336:         /*
     337: 		 * Set next state; give 5 minutes to complete
     338: 		 * rewind or 10 seconds per iteration (minimum 60
     339: 		 * seconds and max 5 minutes) to complete other ops.
     340: 		 */
     341:         if (bp->b_command == TM_REW) {
     342:             tmtab.b_active = SREW;
     343:             sc->sc_timo = 5 * 60;
     344:         } else {
     345:             tmtab.b_active = SCOM;
     346:             sc->sc_timo = MIN(MAX(10 * bp->b_repcnt, 60), 5 * 60);
     347:         }
     348:         if (bp->b_command == TM_SFORW || bp->b_command == TM_SREV)
     349:             tmaddr->tmbc = bp->b_repcnt;
     350:         goto dobpcmd;
     351:     }
     352:     /*
     353: 	 * The following checks handle boundary cases for operation
     354: 	 * on non-raw tapes.  On raw tapes the initialization of
     355: 	 * sc->sc_nxrec on entry causes them to be skipped normally
     356: 	 * (except in the case of retries).
     357: 	 */
     358:     if (dbtofsb(bp->b_blkno) > sc->sc_nxrec) {
     359:         /*
     360: 		 * Can't read past known end-of-file.
     361: 		 */
     362:         bp->b_flags |= B_ERROR;
     363:         bp->b_error = ENXIO;
     364:         goto next;
     365:     }
     366:     if (dbtofsb(bp->b_blkno) == sc->sc_nxrec && bp->b_flags & B_READ) {
     367:         /*
     368: 		 * Reading at end of file returns 0 bytes.
     369: 		 * Buffer will be cleared (if written) in rwip.
     370: 		 */
     371:         bp->b_resid = bp->b_bcount;
     372:         goto next;
     373:     }
     374:     if ((bp->b_flags & B_READ) == 0)
     375:         /*
     376: 		 * Writing sets EOF.
     377: 		 */
     378:         sc->sc_nxrec = dbtofsb(bp->b_blkno) + (daddr_t) 1;
     379:     /*
     380: 	 * If the data transfer command is in the correct place,
     381: 	 * set up all registers and do the transfer.
     382: 	 */
     383:     if ((blkno = sc->sc_blkno) == dbtofsb(bp->b_blkno)) {
     384:         tmaddr->tmbc = -bp->b_bcount;
     385:         if ((bp->b_flags & B_READ) == 0) {
     386:             if (tmtab.b_errcnt)
     387:                 cmd = TM_WIRG;
     388:             else
     389:                 cmd = TM_WCOM;
     390:         } else
     391:             cmd = TM_RCOM;
     392:         tmtab.b_active = SIO;
     393:         tmaddr->tmba = bp->b_un.b_addr;
     394:         cmd = sc->sc_dens | ((bp->b_xmem & 03) << 4) | cmd;
     395:         sc->sc_timo = 60;   /* premature, but should serve */
     396:         tmaddr->tmcs = cmd;
     397:         return;
     398:     }
     399:     /*
     400: 	 * Tape positioned incorrectly;
     401: 	 * set to seek forward or backward to the correct spot.
     402: 	 * This happens for raw tapes only on error retries.
     403: 	 */
     404:     tmtab.b_active = SSEEK;
     405:     if (blkno < dbtofsb(bp->b_blkno)) {
     406:         bp->b_command = TM_SFORW;
     407:         tmaddr->tmbc = (short) (blkno - dbtofsb(bp->b_blkno));
     408:     } else {
     409:         bp->b_command = TM_SREV;
     410:         tmaddr->tmbc = (short) (dbtofsb(bp->b_blkno) - blkno);
     411:     }
     412:     sc->sc_timo = MIN(MAX(10 * -tmaddr->tmbc, 60), 5 * 60);
     413:
     414: dobpcmd:
     415:     /*
     416: 	 * Do the command in bp.
     417: 	 */
     418:     tmaddr->tmcs = (sc->sc_dens | bp->b_command);
     419:     return;
     420:
     421: next:
     422:     /*
     423: 	 * Done with this operation due to error or
     424: 	 * the fact that it doesn't do anything.
     425: 	 * Dequeue the transfer and continue processing.
     426: 	 */
     427:     tmtab.b_errcnt = 0;
     428:     tmtab.b_actf = bp->av_forw;
     429: #ifdef  SOFUB_MAP
     430:     if  (tmsoftmap == 1)
     431:         sofub_relse(bp, bp->b_bcount - bp->b_resid);
     432: #endif
     433:     iodone(bp);
     434:     goto loop;
     435: }
     436:
     437: /*
     438:  * The interrupt routine.
     439:  */
     440: tmintr()
     441: {
     442:     register struct tmdevice *tmaddr = TMADDR;
     443:     register struct buf *bp;
     444:     int teunit;
     445:     int state;
     446:     register struct te_softc *sc;
     447:
     448:     if ((bp = tmtab.b_actf) == NULL)
     449:         return;
     450:     teunit = TEUNIT(bp->b_dev);
     451:     sc = &te_softc[teunit];
     452:     /*
     453: 	 * If last command was a rewind, and tape is still
     454: 	 * rewinding, wait for the rewind complete interrupt.
     455: 	 */
     456:     if (tmtab.b_active == SREW) {
     457:         tmtab.b_active = SCOM;
     458:         if (tmaddr->tmer & TMER_RWS) {
     459:             sc->sc_timo = 5 * 60;       /* 5 minutes */
     460:             return;
     461:         }
     462:     }
     463:     /*
     464: 	 * An operation completed... record status.
     465: 	 */
     466:     sc->sc_timo = INF;
     467:     sc->sc_erreg = tmaddr->tmer;
     468:     sc->sc_dsreg = tmaddr->tmcs;
     469:     sc->sc_resid = tmaddr->tmbc;
     470:     if ((bp->b_flags & B_READ) == 0)
     471:         sc->sc_lastiow = 1;
     472:     state = tmtab.b_active;
     473:     tmtab.b_active = 0;
     474:     /*
     475: 	 * Check for errors.
     476: 	 */
     477:     if (tmaddr->tmcs & TM_ERR) {
     478:         while(tmaddr->tmer & TMER_SDWN)
     479:             ;           /* await settle down */
     480:         /*
     481: 		 * If we hit the end of the tape file, update our position.
     482: 		 */
     483:         if (tmaddr->tmer & TMER_EOF) {
     484:             tmseteof(bp);       /* set blkno and nxrec */
     485:             state = SCOM;       /* force completion */
     486:             /*
     487: 			 * Stuff bc so it will be unstuffed correctly
     488: 			 * later to get resid.
     489: 			 */
     490:             tmaddr->tmbc = -bp->b_bcount;
     491:             goto opdone;
     492:         }
     493:         /*
     494: 		 * If we were reading raw tape and the only error was that the
     495: 		 * record was too long, then we don't consider this an error.
     496: 		 */
     497:         if ((bp->b_flags & B_PHYS) && (bp->b_flags & B_READ) &&
     498:             (tmaddr->tmer & (TMER_HARD | TMER_SOFT)) == TMER_RLE)
     499:             goto ignoreerr;
     500:         /*
     501: 		 * If error is not hard, and this was an i/o operation
     502: 		 * retry up to 8 times.
     503: 		 */
     504:         if ((tmaddr->tmer & TMER_HARD) == 0 && state == SIO) {
     505:             if (++tmtab.b_errcnt < 7) {
     506:                 sc->sc_blkno++;
     507:                 goto opcont;
     508:             }
     509:         } else
     510:             /*
     511: 			 * Hard or non-i/o errors on non-raw tape
     512: 			 * cause it to close.
     513: 			 */
     514:             if (sc->sc_openf > 0 && !(bp->b_flags & B_PHYS))
     515:                 sc->sc_openf = -1;
     516:         /*
     517: 		 * Couldn't recover error
     518: 		 */
     519:         uprintf("te%d: hard error bn%D er=%b\n",
     520:            teunit, bp->b_blkno, sc->sc_erreg, TMER_BITS);
     521:         bp->b_flags |= B_ERROR;
     522:         goto opdone;
     523:     }
     524:     /*
     525: 	 * Advance tape control finite state machine.
     526: 	 */
     527: ignoreerr:
     528:     switch (state) {
     529:     case SIO:
     530:         /*
     531: 		 * Read/write increments tape block number.
     532: 		 */
     533:         sc->sc_blkno++;
     534:         goto opdone;
     535:     case SCOM:
     536:         /*
     537: 		 * For forward/backward space record update current position.
     538: 		 */
     539:         if (bp == &ctmbuf)
     540:             switch (bp->b_command) {
     541:             case TM_SFORW:
     542:                 sc->sc_blkno -= (daddr_t) (bp->b_repcnt);
     543:                 break;
     544:             case TM_SREV:
     545:                 sc->sc_blkno += (daddr_t) (bp->b_repcnt);
     546:                 break;
     547:             }
     548:         goto opdone;
     549:     case SSEEK:
     550:         sc->sc_blkno = dbtofsb(bp->b_blkno);
     551:         goto opcont;
     552:     default:
     553:         panic("tmintr");
     554:     }
     555: opdone:
     556:     /*
     557: 	 * Reset error count and remove
     558: 	 * from device queue.
     559: 	 */
     560:     tmtab.b_errcnt = 0;
     561:     tmtab.b_actf = bp->av_forw;
     562:     bp->b_resid = -tmaddr->tmbc;
     563: #ifdef  SOFUB_MAP
     564:     if  (tmsoftmap == 1)
     565:         sofub_relse(bp, bp->b_bcount - bp->b_resid);
     566: #endif
     567:     iodone(bp);
     568:
     569: opcont:
     570:     tmstart();
     571: }
     572:
     573: tmtimer(dev)
     574: register dev_t  dev;
     575: {
     576:     register int s;
     577:     register struct te_softc *sc = &te_softc[TEUNIT(dev)];
     578:
     579:     if (sc->sc_timo != INF && (sc->sc_timo -= 5) < 0) {
     580:         log(LOG_NOTICE, "te%d: lost interrupt\n", TEUNIT(dev));
     581:         sc->sc_timo = INF;
     582:         s = splbio();
     583:         tmintr();
     584:         splx(s);
     585:     }
     586:     timeout(tmtimer, (caddr_t) dev, 5 * hz);
     587: }
     588:
     589: tmseteof(bp)
     590: register struct buf *bp;
     591: {
     592:     register struct tmdevice *tmaddr = TMADDR;
     593:     daddr_t bn = dbtofsb(bp->b_blkno);
     594:     register struct te_softc *sc = &te_softc[TEUNIT(bp->b_dev)];
     595:
     596:     if (bp == &ctmbuf) {
     597:         if (sc->sc_blkno > bn) {
     598:             /* reversing */
     599:             sc->sc_nxrec = bn - (daddr_t) (tmaddr->tmbc);
     600:             sc->sc_blkno = sc->sc_nxrec;
     601:         } else {
     602:             /* spacing forward */
     603:             sc->sc_blkno = bn + (daddr_t) (tmaddr->tmbc);
     604:             sc->sc_nxrec = sc->sc_blkno - (daddr_t) 1;
     605:         }
     606:         return;
     607:     }
     608:     /* eof on read */
     609:     sc->sc_nxrec = bn;
     610: }
     611:
     612: /*ARGSUSED*/
     613: tmioctl(dev, cmd, data, flag)
     614:     dev_t dev;
     615:     u_int cmd;
     616:     caddr_t data;
     617: {
     618:     register struct buf *bp = &ctmbuf;
     619:     register struct te_softc *sc = &te_softc[TEUNIT(dev)];
     620:     register callcount;
     621:     u_short fcount;
     622:     struct mtop *mtop;
     623:     struct mtget *mtget;
     624:     /* we depend on the values and order of the MT codes here */
     625:     static tmops[] = {TM_WEOF,TM_SFORW,TM_SREV,TM_SFORW,TM_SREV,TM_REW,TM_OFFL,TM_SENSE};
     626:
     627:     switch (cmd) {
     628:
     629:     case MTIOCTOP:  /* tape operation */
     630:         mtop = (struct mtop *)data;
     631:         switch(mtop->mt_op) {
     632:         case MTWEOF:
     633:             callcount = mtop->mt_count;
     634:             fcount = 1;
     635:             break;
     636:         case MTFSF: case MTBSF:
     637:             callcount = mtop->mt_count;
     638:             fcount = INF;
     639:             break;
     640:         case MTFSR: case MTBSR:
     641:             callcount = 1;
     642:             fcount = mtop->mt_count;
     643:             break;
     644:         case MTREW: case MTOFFL: case MTNOP:
     645:             callcount = 1;
     646:             fcount = 1;
     647:             break;
     648:         default:
     649:             return (ENXIO);
     650:         }
     651:         if (callcount <= 0 || fcount <= 0)
     652:             return (EINVAL);
     653:         while (--callcount >= 0) {
     654:             tmcommand(dev, tmops[mtop->mt_op], fcount);
     655:             if ((mtop->mt_op == MTFSR || mtop->mt_op == MTBSR) &&
     656:                 bp->b_resid)
     657:                 return (EIO);
     658:             if ((bp->b_flags & B_ERROR) || sc->sc_erreg & TMER_BOT)
     659:                 break;
     660:         }
     661:         return (geterror(bp));
     662:     case MTIOCGET:
     663:         mtget = (struct mtget *)data;
     664:         mtget->mt_dsreg = sc->sc_dsreg;
     665:         mtget->mt_erreg = sc->sc_erreg;
     666:         mtget->mt_resid = sc->sc_resid;
     667:         mtget->mt_type = MT_ISTM;
     668:         break;
     669:     default:
     670:         return (ENXIO);
     671:     }
     672:     return (0);
     673: }
     674: #endif NTM

#### Defined functions

tmattach defined in line 96; never used
tmclose defined in line 183; never used
tmcommand defined in line 209; used 6 times

- in line 141, 190-192(3), 201, 654

tmintr defined in line 440; used 2 times

- in line 583
- in /usr/src/sys/pdp/scb.s line 372

tmioctl defined in line 613; never used
tmopen defined in line 123; never used
tmseteof defined in line 589; used 1 times

- in line 484

tmstart defined in line 295; used 2 times

- in line 291, 570

tmstrategy defined in line 250; used 1 times

- in line 234

tmtimer defined in line 573; used 3 times

- in line 87, 169, 586

#### Defined variables

TMADDR defined in line 30; used 5 times

- in line 109, 131, 299, 442, 592

ctmbuf defined in line 33; used 5 times

- in line 216, 329, 539, 596, 618

te_softc defined in line 62; used 8 times

- in line 129, 187, 254, 310, 451, 577, 594, 619

tmdens defined in line 121; used 1 times

- in line 136

tmsoftmap defined in line 90; used 6 times

- in line 106-107(2), 265, 273, 430, 564

tmtab defined in line 32; used 22 times

- in line 139, 281-290(5), 304, 342-345(2), 386, 392, 404, 427-428(2), 448, 456-457(2), 472-473(2), 505, 560-561(2)

#### Defined struct's

te_softc defined in line 51; used 16 times

- in line 129(2), 187(2), 254(2), 301(2), 446(2), 577(2), 594(2), 619(2)

#### Defined macros

INF defined in line 85; used 5 times

- in line 167, 466, 579-581(2), 638

SCOM defined in line 71; used 3 times

- in line 345, 457, 485

SIO defined in line 70; used 2 times

- in line 392, 504

SREW defined in line 72; used 2 times

- in line 342, 456

SSEEK defined in line 69; used 1 times

- in line 404

TEDENS defined in line 82; used 1 times

- in line 136

TEUNIT defined in line 77; used 9 times

- in line 128, 187, 254, 306, 450, 577-580(2), 594, 619

T_NOREWIND defined in line 78; used 1 times

- in line 194

Last modified: 1997-02-15 Generated: 2016-12-26 | Generated by src2html V0.67 page hit count: 1468 |