| 1 | /* mt.c 4.1 81/11/04 */ |
| 2 | |
| 3 | #include "mu.h" |
| 4 | #if NMT > 0 |
| 5 | /* |
| 6 | * TM78/TU78 tape driver |
| 7 | * |
| 8 | * Behavior in complex error situations is uncertain... |
| 9 | * |
| 10 | * TODO: |
| 11 | * test error recovery |
| 12 | * add odd byte count kludge from VMS driver |
| 13 | * write dump routine |
| 14 | */ |
| 15 | #include "../h/param.h" |
| 16 | #include "../h/systm.h" |
| 17 | #include "../h/buf.h" |
| 18 | #include "../h/conf.h" |
| 19 | #include "../h/dir.h" |
| 20 | #include "../h/file.h" |
| 21 | #include "../h/user.h" |
| 22 | #include "../h/map.h" |
| 23 | #include "../h/pte.h" |
| 24 | #include "../h/mbareg.h" |
| 25 | #include "../h/mbavar.h" |
| 26 | #include "../h/mtio.h" |
| 27 | #include "../h/ioctl.h" |
| 28 | #include "../h/cmap.h" |
| 29 | #include "../h/cpu.h" |
| 30 | |
| 31 | #include "../h/mtreg.h" |
| 32 | |
| 33 | struct buf rmtbuf[NMT]; |
| 34 | struct buf cmtbuf[NMT]; |
| 35 | |
| 36 | short mttypes[] = |
| 37 | { MBDT_TU78, 0 }; |
| 38 | struct mba_device *mtinfo[NMT]; |
| 39 | int mtattach(), mtslave(), mtustart(), mtstart(), mtndtint(), mtdtint(); |
| 40 | struct mba_driver mtdriver = |
| 41 | { mtattach, mtslave, mtustart, mtstart, mtdtint, mtndtint, |
| 42 | mttypes, "mt", "mu", mtinfo }; |
| 43 | |
| 44 | #define MASKREG(r) ((r) & 0xffff) |
| 45 | |
| 46 | /* bits in minor device */ |
| 47 | #define MUUNIT(dev) (minor(dev)&03) |
| 48 | #define H_NOREWIND 04 |
| 49 | #define H_6250BPI 08 |
| 50 | |
| 51 | #define MTUNIT(dev) (mutomt[MUUNIT(dev)]) |
| 52 | |
| 53 | #define INF (daddr_t)1000000L /* a block number that wont exist */ |
| 54 | |
| 55 | struct mu_softc { |
| 56 | char sc_openf; |
| 57 | char sc_flags; |
| 58 | daddr_t sc_blkno; |
| 59 | daddr_t sc_nxrec; |
| 60 | u_short sc_erreg; |
| 61 | u_short sc_dsreg; |
| 62 | short sc_resid; |
| 63 | short sc_dens; |
| 64 | struct mba_device *sc_mi; |
| 65 | int sc_slave; |
| 66 | } mu_softc[NMU]; |
| 67 | short mutomt[NMU]; |
| 68 | |
| 69 | /* |
| 70 | * Bits for sc_flags. |
| 71 | */ |
| 72 | #define H_WRITTEN 1 /* last operation was a write */ |
| 73 | |
| 74 | char mtds_bits[] = MTDS_BITS; |
| 75 | |
| 76 | /*ARGSUSED*/ |
| 77 | mtattach(mi) |
| 78 | struct mba_device *mi; |
| 79 | { |
| 80 | |
| 81 | } |
| 82 | |
| 83 | mtslave(mi, ms) |
| 84 | struct mba_device *mi; |
| 85 | struct mba_slave *ms; |
| 86 | { |
| 87 | register struct mu_softc *sc = &mu_softc[ms->ms_unit]; |
| 88 | register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv; |
| 89 | int s = spl7(), rtn = 0; |
| 90 | |
| 91 | mtaddr->mtas = -1; |
| 92 | mtaddr->mtncs[ms->ms_slave] = MT_SENSE|MT_GO; |
| 93 | while (mtaddr->mtas == 0) |
| 94 | ; |
| 95 | if ((mtaddr->mtner & MTER_INTCODE) == MTER_DONE && |
| 96 | (mtaddr->mtds & MTDS_PRES)) { |
| 97 | sc->sc_mi = mi; |
| 98 | sc->sc_slave = ms->ms_slave; |
| 99 | mutomt[ms->ms_unit] = mi->mi_unit; |
| 100 | rtn = 1; |
| 101 | } |
| 102 | mtaddr->mtas = mtaddr->mtas; |
| 103 | splx(s); |
| 104 | return (rtn); |
| 105 | } |
| 106 | |
| 107 | mtopen(dev, flag) |
| 108 | dev_t dev; |
| 109 | int flag; |
| 110 | { |
| 111 | register int muunit; |
| 112 | register struct mba_device *mi; |
| 113 | register struct mu_softc *sc; |
| 114 | int olddens, dens; |
| 115 | |
| 116 | muunit = MUUNIT(dev); |
| 117 | if (muunit >= NMU || (sc = &mu_softc[muunit])->sc_openf || |
| 118 | (mi = mtinfo[MTUNIT(dev)]) == 0 || mi->mi_alive == 0) { |
| 119 | u.u_error = ENXIO; |
| 120 | return; |
| 121 | } |
| 122 | olddens = sc->sc_dens; |
| 123 | dens = sc->sc_dens = (minor(dev)&H_6250BPI) ? MT_GCR : 0; |
| 124 | mtcommand(dev, MT_SENSE, 1); |
| 125 | sc->sc_dens = olddens; |
| 126 | if ((sc->sc_dsreg & MTDS_ONL) == 0) { |
| 127 | uprintf("mu%d: not online\n", muunit); |
| 128 | u.u_error = EIO; |
| 129 | return; |
| 130 | } |
| 131 | if ((flag&FWRITE) && (sc->sc_dsreg&MTDS_FPT)) { |
| 132 | uprintf("mu%d: no write ring\n", muunit); |
| 133 | u.u_error = EIO; |
| 134 | return; |
| 135 | } |
| 136 | if ((sc->sc_dsreg & MTDS_BOT) == 0 && (flag&FWRITE) && |
| 137 | dens != sc->sc_dens) { |
| 138 | uprintf("mu%d: can't change density in mid-tape\n", muunit); |
| 139 | u.u_error = EIO; |
| 140 | return; |
| 141 | } |
| 142 | sc->sc_openf = 1; |
| 143 | sc->sc_blkno = (daddr_t)0; |
| 144 | sc->sc_nxrec = INF; |
| 145 | sc->sc_flags = 0; |
| 146 | sc->sc_dens = dens; |
| 147 | } |
| 148 | |
| 149 | mtclose(dev, flag) |
| 150 | register dev_t dev; |
| 151 | register flag; |
| 152 | { |
| 153 | register struct mu_softc *sc = &mu_softc[MUUNIT(dev)]; |
| 154 | |
| 155 | if (flag == FWRITE || ((flag&FWRITE) && (sc->sc_flags&H_WRITTEN))) |
| 156 | mtcommand(dev, MT_CLS|sc->sc_dens, 1); |
| 157 | if ((minor(dev)&H_NOREWIND) == 0) |
| 158 | mtcommand(dev, MT_REW, 0); |
| 159 | sc->sc_openf = 0; |
| 160 | } |
| 161 | |
| 162 | mtcommand(dev, com, count) |
| 163 | dev_t dev; |
| 164 | int com, count; |
| 165 | { |
| 166 | register struct buf *bp; |
| 167 | |
| 168 | bp = &cmtbuf[MTUNIT(dev)]; |
| 169 | (void) spl5(); |
| 170 | while (bp->b_flags&B_BUSY) { |
| 171 | if(bp->b_repcnt == 0 && (bp->b_flags&B_DONE)) |
| 172 | break; |
| 173 | bp->b_flags |= B_WANTED; |
| 174 | sleep((caddr_t)bp, PRIBIO); |
| 175 | } |
| 176 | bp->b_flags = B_BUSY|B_READ; |
| 177 | (void) spl0(); |
| 178 | bp->b_dev = dev; |
| 179 | bp->b_command = com; |
| 180 | bp->b_repcnt = count; |
| 181 | bp->b_blkno = 0; |
| 182 | mtstrategy(bp); |
| 183 | if (count == 0) |
| 184 | return; |
| 185 | iowait(bp); |
| 186 | if (bp->b_flags&B_WANTED) |
| 187 | wakeup((caddr_t)bp); |
| 188 | bp->b_flags &= B_ERROR; |
| 189 | } |
| 190 | |
| 191 | mtstrategy(bp) |
| 192 | register struct buf *bp; |
| 193 | { |
| 194 | register struct mba_device *mi = mtinfo[MTUNIT(bp->b_dev)]; |
| 195 | register struct buf *dp; |
| 196 | |
| 197 | bp->av_forw = NULL; |
| 198 | dp = &mi->mi_tab; |
| 199 | (void) spl5(); |
| 200 | if (dp->b_actf == NULL) |
| 201 | dp->b_actf = bp; |
| 202 | else |
| 203 | dp->b_actl->av_forw = bp; |
| 204 | dp->b_actl = bp; |
| 205 | if (dp->b_active == 0) |
| 206 | mbustart(mi); |
| 207 | (void) spl0(); |
| 208 | } |
| 209 | |
| 210 | mtustart(mi) |
| 211 | register struct mba_device *mi; |
| 212 | { |
| 213 | register struct mtdevice *mtaddr = |
| 214 | (struct mtdevice *)mi->mi_drv; |
| 215 | register struct buf *bp = mi->mi_tab.b_actf; |
| 216 | register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)]; |
| 217 | daddr_t blkno; |
| 218 | |
| 219 | sc->sc_flags &= ~H_WRITTEN; |
| 220 | if (sc->sc_openf < 0) { |
| 221 | bp->b_flags |= B_ERROR; |
| 222 | return (MBU_NEXT); |
| 223 | } |
| 224 | if (bp != &cmtbuf[MTUNIT(bp->b_dev)]) { |
| 225 | if (dbtofsb(bp->b_blkno) > sc->sc_nxrec) { |
| 226 | bp->b_flags |= B_ERROR; |
| 227 | bp->b_error = ENXIO; |
| 228 | return (MBU_NEXT); |
| 229 | } |
| 230 | if (dbtofsb(bp->b_blkno) == sc->sc_nxrec && |
| 231 | bp->b_flags&B_READ) { |
| 232 | bp->b_resid = bp->b_bcount; |
| 233 | clrbuf(bp); |
| 234 | return (MBU_NEXT); |
| 235 | } |
| 236 | if ((bp->b_flags&B_READ)==0) |
| 237 | sc->sc_nxrec = dbtofsb(bp->b_blkno) + 1; |
| 238 | } else { |
| 239 | mtaddr->mtncs[MUUNIT(bp->b_dev)] = |
| 240 | (bp->b_repcnt<<8)|bp->b_command|MT_GO; |
| 241 | return (MBU_STARTED); |
| 242 | } |
| 243 | if ((blkno = sc->sc_blkno) == dbtofsb(bp->b_blkno)) { |
| 244 | if (mi->mi_tab.b_errcnt == 2) { |
| 245 | mtaddr->mtca = MUUNIT(bp->b_dev); |
| 246 | } else { |
| 247 | mtaddr->mtbc = bp->b_bcount; |
| 248 | mtaddr->mtca = (1<<2)|MUUNIT(bp->b_dev); |
| 249 | } |
| 250 | return (MBU_DODATA); |
| 251 | } |
| 252 | if (blkno < dbtofsb(bp->b_blkno)) |
| 253 | mtaddr->mtncs[MUUNIT(bp->b_dev)] = |
| 254 | (min(dbtofsb(bp->b_blkno) - blkno, 0377)<<8)| MT_SFORW|MT_GO; |
| 255 | else |
| 256 | mtaddr->mtncs[MUUNIT(bp->b_dev)] = |
| 257 | (min(blkno - dbtofsb(bp->b_blkno), 0377)<<8)| MT_SREV|MT_GO; |
| 258 | return (MBU_STARTED); |
| 259 | } |
| 260 | |
| 261 | mtstart(mi) |
| 262 | register struct mba_device *mi; |
| 263 | { |
| 264 | register struct buf *bp = mi->mi_tab.b_actf; |
| 265 | register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)]; |
| 266 | |
| 267 | if (bp->b_flags & B_READ) |
| 268 | if (mi->mi_tab.b_errcnt == 2) |
| 269 | return(MT_READREV|MT_GO); |
| 270 | else |
| 271 | return(MT_READ|MT_GO); |
| 272 | else |
| 273 | return(MT_WRITE|sc->sc_dens|MT_GO); |
| 274 | } |
| 275 | |
| 276 | mtdtint(mi, mbsr) |
| 277 | register struct mba_device *mi; |
| 278 | int mbsr; |
| 279 | { |
| 280 | register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv; |
| 281 | register struct buf *bp = mi->mi_tab.b_actf; |
| 282 | register struct mu_softc *sc; |
| 283 | |
| 284 | /* I'M NOT SURE IF THIS SHOULD ALWAYS BE THE CASE SO FOR NOW... */ |
| 285 | if ((mtaddr->mtca&3) != MUUNIT(bp->b_dev)) { |
| 286 | printf("mt: wrong unit!\n"); |
| 287 | mtaddr->mtca = MUUNIT(bp->b_dev); |
| 288 | } |
| 289 | sc = &mu_softc[MUUNIT(bp->b_dev)]; |
| 290 | sc->sc_erreg = mtaddr->mter; |
| 291 | if((bp->b_flags & B_READ) == 0) |
| 292 | sc->sc_flags |= H_WRITTEN; |
| 293 | switch (sc->sc_erreg & MTER_INTCODE) { |
| 294 | case MTER_DONE: |
| 295 | case MTER_LONGREC: |
| 296 | if (mi->mi_tab.b_errcnt != 2) |
| 297 | sc->sc_blkno++; |
| 298 | bp->b_resid = 0; |
| 299 | break; |
| 300 | |
| 301 | case MTER_NOTCAP: |
| 302 | printf("mu%d: blank tape\n", MUUNIT(bp->b_dev)); |
| 303 | goto err; |
| 304 | |
| 305 | case MTER_TM: |
| 306 | case MTER_EOT: |
| 307 | sc->sc_blkno++; |
| 308 | err: |
| 309 | bp->b_resid = bp->b_bcount; |
| 310 | sc->sc_nxrec = dbtofsb(bp->b_blkno); |
| 311 | break; |
| 312 | |
| 313 | case MTER_SHRTREC: |
| 314 | sc->sc_blkno++; |
| 315 | if (bp != &rmtbuf[MTUNIT(bp->b_dev)]) |
| 316 | bp->b_flags |= B_ERROR; |
| 317 | if (mi->mi_tab.b_errcnt == 2) |
| 318 | bp->b_bcount = bp->b_resid; /* restore saved value */ |
| 319 | bp->b_resid = bp->b_bcount - mtaddr->mtbc; |
| 320 | break; |
| 321 | |
| 322 | case MTER_RDOPP: |
| 323 | mi->mi_tab.b_errcnt = 2; /* indicate "read opposite" */ |
| 324 | bp->b_resid = bp->b_bcount; /* save it */ |
| 325 | bp->b_bcount = mtaddr->mtbc; /* use this instead */ |
| 326 | return(MBD_RETRY); |
| 327 | |
| 328 | case MTER_RETRY: |
| 329 | mi->mi_tab.b_errcnt = 1; /* indicate simple retry */ |
| 330 | return(MBD_RETRY); |
| 331 | |
| 332 | case MTER_OFFLINE: |
| 333 | if (sc->sc_openf > 0) { |
| 334 | sc->sc_openf = -1; |
| 335 | printf("mu%d: offline\n", MUUNIT(bp->b_dev)); |
| 336 | } |
| 337 | bp->b_flags |= B_ERROR; |
| 338 | break; |
| 339 | |
| 340 | case MTER_FPT: |
| 341 | printf("mu%d: no write ring\n", MUUNIT(bp->b_dev)); |
| 342 | bp->b_flags |= B_ERROR; |
| 343 | break; |
| 344 | |
| 345 | default: |
| 346 | printf("mu%d: hard error bn%d mbsr=%b er=%x ds=%b\n", |
| 347 | MUUNIT(bp->b_dev), bp->b_blkno, |
| 348 | mbsr, mbsr_bits, sc->sc_erreg, |
| 349 | sc->sc_dsreg, mtds_bits); |
| 350 | bp->b_flags |= B_ERROR; |
| 351 | mtaddr->mtid = MTID_CLR; /* reset the TM78 */ |
| 352 | DELAY(250); |
| 353 | while ((mtaddr->mtid & MTID_RDY) == 0) /* wait for it */ |
| 354 | ; |
| 355 | return (MBD_DONE); |
| 356 | } |
| 357 | /* CHECK FOR MBA ERROR WHEN NO OTHER ERROR INDICATED? */ |
| 358 | return (MBD_DONE); |
| 359 | } |
| 360 | |
| 361 | mtndtint(mi) |
| 362 | register struct mba_device *mi; |
| 363 | { |
| 364 | register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv; |
| 365 | register struct buf *bp = mi->mi_tab.b_actf; |
| 366 | register struct mu_softc *sc; |
| 367 | int er, fc, unit; |
| 368 | |
| 369 | unit = (mtaddr->mtner >> 8) & 3; |
| 370 | er = MASKREG(mtaddr->mtner); |
| 371 | /* WILL THIS OCCUR IF ANOTHER DRIVE COMES ONLINE? */ |
| 372 | if (bp == 0 || unit != MUUNIT(bp->b_dev)) { /* consistency check */ |
| 373 | if ((er & MTER_INTCODE) != MTER_ONLINE) |
| 374 | printf("mt: unit %d random interrupt\n", unit); |
| 375 | return (MBN_SKIP); |
| 376 | } |
| 377 | if (bp == 0) |
| 378 | return (MBN_SKIP); |
| 379 | fc = (mtaddr->mtncs[unit] >> 8) & 0xff; |
| 380 | sc = &mu_softc[unit]; |
| 381 | sc->sc_erreg = er; |
| 382 | sc->sc_resid = fc; |
| 383 | switch (er & MTER_INTCODE) { |
| 384 | case MTER_DONE: |
| 385 | if (bp == &cmtbuf[MTUNIT(bp->b_dev)]) { |
| 386 | done: |
| 387 | if (bp->b_command == MT_SENSE) |
| 388 | sc->sc_dsreg = MASKREG(mtaddr->mtds); |
| 389 | bp->b_resid = fc; |
| 390 | return (MBN_DONE); |
| 391 | } |
| 392 | /* this is UGLY! (but is it correct?) */ |
| 393 | if ((fc = dbtofsb(bp->b_blkno) - sc->sc_blkno) < 0) |
| 394 | sc->sc_blkno -= min(0377, -fc); |
| 395 | else |
| 396 | sc->sc_blkno += min(0377, fc); |
| 397 | return (MBN_RETRY); |
| 398 | |
| 399 | case MTER_RWDING: |
| 400 | return (MBN_SKIP); /* ignore "rewind started" interrupt */ |
| 401 | |
| 402 | case MTER_NOTCAP: |
| 403 | printf("mu%d: blank tape\n", MUUNIT(bp->b_dev)); |
| 404 | |
| 405 | case MTER_TM: |
| 406 | case MTER_EOT: |
| 407 | case MTER_LEOT: |
| 408 | if (sc->sc_blkno > dbtofsb(bp->b_blkno)) { |
| 409 | sc->sc_nxrec = dbtofsb(bp->b_blkno) + fc; |
| 410 | sc->sc_blkno = sc->sc_nxrec; |
| 411 | } else { |
| 412 | sc->sc_blkno = dbtofsb(bp->b_blkno) - fc; |
| 413 | sc->sc_nxrec = sc->sc_blkno - 1; |
| 414 | } |
| 415 | return (MBN_RETRY); |
| 416 | |
| 417 | case MTER_FPT: |
| 418 | printf("mu%d: no write ring\n", MUUNIT(bp->b_dev)); |
| 419 | bp->b_flags |= B_ERROR; |
| 420 | return (MBN_DONE); |
| 421 | |
| 422 | case MTER_OFFLINE: |
| 423 | if (sc->sc_openf > 0) { |
| 424 | sc->sc_openf = -1; |
| 425 | printf("mu%d: offline\n", MUUNIT(bp->b_dev)); |
| 426 | } |
| 427 | bp->b_flags |= B_ERROR; |
| 428 | return (MBN_DONE); |
| 429 | |
| 430 | case MTER_BOT: |
| 431 | if (bp == &cmtbuf[MTUNIT(bp->b_dev)]) |
| 432 | goto done; |
| 433 | /* FALL THROUGH */ |
| 434 | |
| 435 | default: |
| 436 | printf("mu%d: hard error bn%d er=%o ds=%b\n", |
| 437 | MUUNIT(bp->b_dev), bp->b_blkno, |
| 438 | sc->sc_erreg, sc->sc_dsreg, mtds_bits); |
| 439 | mtaddr->mtid = MTID_CLR; /* reset the TM78 */ |
| 440 | DELAY(250); |
| 441 | while ((mtaddr->mtid & MTID_RDY) == 0) /* wait for it */ |
| 442 | ; |
| 443 | bp->b_flags |= B_ERROR; |
| 444 | return (MBN_DONE); |
| 445 | } |
| 446 | /* NOTREACHED */ |
| 447 | } |
| 448 | |
| 449 | mtread(dev) |
| 450 | dev_t dev; |
| 451 | { |
| 452 | |
| 453 | mtphys(dev); |
| 454 | if (u.u_error) |
| 455 | return; |
| 456 | physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_READ, minphys); |
| 457 | } |
| 458 | |
| 459 | mtwrite(dev) |
| 460 | { |
| 461 | |
| 462 | mtphys(dev); |
| 463 | if (u.u_error) |
| 464 | return; |
| 465 | physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_WRITE, minphys); |
| 466 | } |
| 467 | |
| 468 | mtphys(dev) |
| 469 | dev_t dev; |
| 470 | { |
| 471 | register int mtunit; |
| 472 | register struct mu_softc *sc; |
| 473 | register struct mba_device *mi; |
| 474 | daddr_t a; |
| 475 | |
| 476 | mtunit = MTUNIT(dev); |
| 477 | if (mtunit >= NMT || (mi = mtinfo[mtunit]) == 0 || mi->mi_alive == 0) { |
| 478 | u.u_error = ENXIO; |
| 479 | return; |
| 480 | } |
| 481 | a = u.u_offset >> 9; |
| 482 | sc = &mu_softc[MUUNIT(dev)]; |
| 483 | sc->sc_blkno = dbtofsb(a); |
| 484 | sc->sc_nxrec = dbtofsb(a)+1; |
| 485 | } |
| 486 | |
| 487 | /*ARGSUSED*/ |
| 488 | mtioctl(dev, cmd, addr, flag) |
| 489 | dev_t dev; |
| 490 | int cmd; |
| 491 | caddr_t addr; |
| 492 | int flag; |
| 493 | { |
| 494 | register struct mu_softc *sc = &mu_softc[MUUNIT(dev)]; |
| 495 | register struct buf *bp = &cmtbuf[MTUNIT(dev)]; |
| 496 | register callcount; |
| 497 | register int n, op; |
| 498 | int fcount; |
| 499 | struct mtop mtop; |
| 500 | struct mtget mtget; |
| 501 | /* we depend of the values and order of the MT codes here */ |
| 502 | static mtops[] = |
| 503 | {MT_WTM,MT_SFORWF,MT_SREVF,MT_SFORW,MT_SREV,MT_REW,MT_UNLOAD,MT_SENSE}; |
| 504 | |
| 505 | switch (cmd) { |
| 506 | case MTIOCTOP: /* tape operation */ |
| 507 | if (copyin((caddr_t)addr, (caddr_t)&mtop, sizeof(mtop))) { |
| 508 | u.u_error = EFAULT; |
| 509 | return; |
| 510 | } |
| 511 | switch(mtop.mt_op) { |
| 512 | case MTWEOF: |
| 513 | callcount = mtop.mt_count; |
| 514 | fcount = 1; |
| 515 | break; |
| 516 | case MTFSF: case MTBSF: |
| 517 | callcount = mtop.mt_count; |
| 518 | fcount = 1; |
| 519 | break; |
| 520 | case MTFSR: case MTBSR: |
| 521 | callcount = 1; |
| 522 | fcount = mtop.mt_count; |
| 523 | break; |
| 524 | case MTREW: case MTOFFL: |
| 525 | callcount = 1; |
| 526 | fcount = 1; |
| 527 | break; |
| 528 | default: |
| 529 | u.u_error = ENXIO; |
| 530 | return; |
| 531 | } |
| 532 | if (callcount <= 0 || fcount <= 0) { |
| 533 | u.u_error = ENXIO; |
| 534 | return; |
| 535 | } |
| 536 | op = mtops[mtop.mt_op]; |
| 537 | if (op == MT_WTM) |
| 538 | op |= sc->sc_dens; |
| 539 | while (--callcount >= 0) { |
| 540 | register int n; |
| 541 | |
| 542 | do { |
| 543 | n = min(fcount, 0xff); |
| 544 | mtcommand(dev, op, n); |
| 545 | fcount -= n; |
| 546 | } while (fcount); |
| 547 | if ((mtop.mt_op == MTFSR || mtop.mt_op == MTBSR) && |
| 548 | bp->b_resid) { |
| 549 | u.u_error = EIO; |
| 550 | break; |
| 551 | } |
| 552 | if (bp->b_flags&B_ERROR) |
| 553 | break; |
| 554 | } |
| 555 | geterror(bp); |
| 556 | return; |
| 557 | case MTIOCGET: |
| 558 | mtget.mt_erreg = sc->sc_erreg; |
| 559 | mtget.mt_resid = sc->sc_resid; |
| 560 | mtcommand(dev, MT_SENSE, 1); /* update drive status */ |
| 561 | mtget.mt_dsreg = sc->sc_dsreg; |
| 562 | mtget.mt_type = MT_ISMT; |
| 563 | if (copyout((caddr_t)&mtget, addr, sizeof(mtget))) |
| 564 | u.u_error = EFAULT; |
| 565 | return; |
| 566 | default: |
| 567 | u.u_error = ENXIO; |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | #define DBSIZE 20 |
| 572 | |
| 573 | mtdump() |
| 574 | { |
| 575 | register struct mba_device *mi; |
| 576 | register struct mba_regs *mp; |
| 577 | register struct mtdevice *mtaddr; |
| 578 | int blk, num; |
| 579 | int start; |
| 580 | |
| 581 | start = 0; |
| 582 | num = maxfree; |
| 583 | #define phys(a,b) ((b)((int)(a)&0x7fffffff)) |
| 584 | if (mtinfo[0] == 0) |
| 585 | return (ENXIO); |
| 586 | mi = phys(mtinfo[0], struct mba_device *); |
| 587 | mp = phys(mi->mi_hd, struct mba_hd *)->mh_physmba; |
| 588 | mp->mba_cr = MBCR_IE; |
| 589 | mtaddr = (struct mtdevice *)&mp->mba_drv[mi->mi_drive]; |
| 590 | #ifdef notyet |
| 591 | mtaddr->mttc = MTTC_PDP11|MTTC_1600BPI; |
| 592 | mtaddr->mtcs1 = MT_DCLR|MT_GO; |
| 593 | while (num > 0) { |
| 594 | blk = num > DBSIZE ? DBSIZE : num; |
| 595 | mtdwrite(start, blk, mtaddr, mp); |
| 596 | start += blk; |
| 597 | num -= blk; |
| 598 | } |
| 599 | mteof(mtaddr); |
| 600 | mteof(mtaddr); |
| 601 | mtwait(mtaddr); |
| 602 | if (mtaddr->mtds&MTDS_ERR) |
| 603 | return (EIO); |
| 604 | mtaddr->mtcs1 = MT_REW|MT_GO; |
| 605 | return (0); |
| 606 | } |
| 607 | |
| 608 | mtdwrite(dbuf, num, mtaddr, mp) |
| 609 | register dbuf, num; |
| 610 | register struct mtdevice *mtaddr; |
| 611 | struct mba_regs *mp; |
| 612 | { |
| 613 | register struct pte *io; |
| 614 | register int i; |
| 615 | |
| 616 | mtwait(mtaddr); |
| 617 | io = mp->mba_map; |
| 618 | for (i = 0; i < num; i++) |
| 619 | *(int *)io++ = dbuf++ | PG_V; |
| 620 | mtaddr->mtfc = -(num*NBPG); |
| 621 | mp->mba_sr = -1; |
| 622 | mp->mba_bcr = -(num*NBPG); |
| 623 | mp->mba_var = 0; |
| 624 | mtaddr->mtcs1 = MT_WCOM|MT_GO; |
| 625 | } |
| 626 | |
| 627 | mtwait(mtaddr) |
| 628 | struct mtdevice *mtaddr; |
| 629 | { |
| 630 | register s; |
| 631 | |
| 632 | do |
| 633 | s = mtaddr->mtds; |
| 634 | while ((s & MTDS_DRY) == 0); |
| 635 | } |
| 636 | |
| 637 | mteof(mtaddr) |
| 638 | struct mtdevice *mtaddr; |
| 639 | { |
| 640 | |
| 641 | mtwait(mtaddr); |
| 642 | mtaddr->mtcs1 = MT_WEOF|MT_GO; |
| 643 | #endif notyet |
| 644 | } |
| 645 | #endif |