fd.c revision 1.36
1 /* $NetBSD: fd.c,v 1.36 1996/12/23 09:09:59 veego Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Christian E. Hopps 5 * Copyright (c) 1996 Ezra Story 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christian E. Hopps. 19 * This product includes software developed by Ezra Story. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/buf.h> 39 #include <sys/device.h> 40 #include <sys/ioctl.h> 41 #include <sys/fcntl.h> 42 #include <sys/disklabel.h> 43 #include <sys/disk.h> 44 #include <sys/dkbad.h> 45 #include <sys/proc.h> 46 #include <machine/cpu.h> 47 #include <amiga/amiga/device.h> 48 #include <amiga/amiga/custom.h> 49 #include <amiga/amiga/cia.h> 50 #include <amiga/amiga/cc.h> 51 52 #include <sys/conf.h> 53 #include <machine/conf.h> 54 55 enum fdc_bits { FDB_CHANGED = 2, FDB_PROTECT, FDB_CYLZERO, FDB_READY }; 56 /* 57 * partitions in fd represent different format floppies 58 * partition a is 0 etc.. 59 */ 60 enum fd_parttypes { 61 FDAMIGAPART = 0, 62 FDMSDOSPART, 63 FDMAXPARTS 64 }; 65 66 #define FDBBSIZE (8192) 67 #define FDSBSIZE (8192) 68 69 #define b_cylin b_resid 70 #define FDUNIT(dev) DISKUNIT(dev) 71 #define FDPART(dev) DISKPART(dev) 72 #define FDMAKEDEV(m, u, p) MAKEDISKDEV((m), (u), (p)) 73 74 /* that's nice, but we don't want to always use this as an amiga drive 75 bunghole :-) */ 76 #define FDNHEADS (2) /* amiga drives always have 2 heads */ 77 #define FDSECSIZE (512) /* amiga drives always have 512 byte sectors */ 78 #define FDSECLWORDS (128) 79 80 #define FDSETTLEDELAY (18000) /* usec delay after seeking after switch dir */ 81 #define FDSTEPDELAY (3500) /* usec delay after steping */ 82 #define FDPRESIDEDELAY (1000) /* usec delay before writing can occur */ 83 #define FDWRITEDELAY (1300) /* usec delay after write */ 84 85 #define FDSTEPOUT (1) /* decrease track step */ 86 #define FDSTEPIN (0) /* increase track step */ 87 88 #define FDCUNITMASK (0x78) /* mask for all units (bits 6-3) */ 89 90 #define FDRETRIES (2) /* default number of retries */ 91 #define FDMAXUNITS (4) /* maximum number of supported units */ 92 93 #define DISKLEN_READ (0) /* fake mask for reading */ 94 #define DISKLEN_WRITE (1 << 14) /* bit for writing */ 95 #define DISKLEN_DMAEN (1 << 15) /* dma go */ 96 #define DMABUFSZ ((DISKLEN_WRITE - 1) * 2) /* largest dma possible */ 97 98 #define FDMFMSYNC (0x4489) 99 #define FDMFMID (0x5554) 100 #define FDMFMDATA (0x5545) 101 #define FDMFMGAP1 (0x9254) 102 #define FDMFMGAP2 (0xAAAA) 103 #define FDMFMGAP3 (0x9254) 104 #define CRC16POLY (0x1021) /* (x^16) + x^12 + x^5 + x^0 */ 105 106 /* 107 * Msdos-type MFM encode/decode 108 */ 109 static u_char msdecode[128]; 110 static u_char msencode[16] = 111 { 112 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 113 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 114 }; 115 static u_short mscrctab[256]; 116 117 /* 118 5554 aaaa aaaa aaa5 2aa4 4452 aa51 119 00 00 03 02 ac 0d 120 */ 121 122 /* 123 * floppy device type 124 */ 125 struct fdtype { 126 u_int driveid; /* drive identification (from drive) */ 127 u_int ncylinders; /* number of cylinders on drive */ 128 u_int amiga_nsectors; /* number of sectors per amiga track */ 129 u_int msdos_nsectors; /* number of sectors per msdos track */ 130 u_int nreadw; /* number of words (short) read per track */ 131 u_int nwritew; /* number of words (short) written per track */ 132 u_int gap; /* track gap size in long words */ 133 u_int precomp[2]; /* 1st and 2nd precomp values */ 134 char *desc; /* description of drive type (useq) */ 135 }; 136 137 /* 138 * floppy disk device data 139 */ 140 struct fd_softc { 141 struct device sc_dv; /* generic device info; must come first */ 142 struct disk dkdev; /* generic disk info */ 143 struct buf bufq; /* queue of buf's */ 144 struct fdtype *type; 145 void *cachep; /* cached track data (write through) */ 146 int cachetrk; /* cahced track -1 for none */ 147 int hwunit; /* unit for amiga controlling hw */ 148 int unitmask; /* mask for cia select deslect */ 149 int pstepdir; /* previous step direction */ 150 int curcyl; /* current curcyl head positioned on */ 151 int flags; /* misc flags */ 152 int wlabel; 153 int stepdelay; /* useq to delay after seek user setable */ 154 int nsectors; /* number of sectors per track */ 155 int openpart; /* which partition [ab] == [12] is open */ 156 short retries; /* number of times to retry failed io */ 157 short retried; /* number of times current io retried */ 158 int bytespersec; /* number of bytes per sector */ 159 }; 160 161 /* fd_softc->flags */ 162 #define FDF_MOTORON (0x01) /* motor is running */ 163 #define FDF_MOTOROFF (0x02) /* motor is waiting to be turned off */ 164 #define FDF_WMOTOROFF (0x04) /* unit wants a wakeup after off */ 165 #define FDF_DIRTY (0x08) /* track cache needs write */ 166 #define FDF_WRITEWAIT (0x10) /* need to head select delay on next setpos */ 167 #define FDF_HAVELABEL (0x20) /* label is valid */ 168 #define FDF_JUSTFLUSH (0x40) /* don't bother caching track. */ 169 #define FDF_NOTRACK0 (0x80) /* was not able to recalibrate drive */ 170 171 int fdc_wantwakeup; 172 int fdc_side; 173 void *fdc_dmap; 174 struct fd_softc *fdc_indma; 175 int fdc_dmalen; 176 int fdc_dmawrite; 177 178 struct fdcargs { 179 struct fdtype *type; 180 int unit; 181 }; 182 183 int fdcmatch __P((struct device *, struct cfdata *, void *)); 184 void fdcattach __P((struct device *, struct device *, void *)); 185 int fdcprint __P((void *, const char *)); 186 int fdmatch __P((struct device *, struct cfdata *, void *)); 187 void fdattach __P((struct device *, struct device *, void *)); 188 189 void fdintr __P((int)); 190 void fdidxintr __P((void)); 191 void fdstrategy __P((struct buf *)); 192 int fdloaddisk __P((struct fd_softc *)); 193 int fdgetdisklabel __P((struct fd_softc *, dev_t)); 194 int fdsetdisklabel __P((struct fd_softc *, struct disklabel *)); 195 int fdputdisklabel __P((struct fd_softc *, dev_t)); 196 struct fdtype * fdcgetfdtype __P((int)); 197 void fdmotoroff __P((void *)); 198 void fdsetpos __P((struct fd_softc *, int, int)); 199 void fdselunit __P((struct fd_softc *)); 200 void fdstart __P((struct fd_softc *)); 201 void fdcont __P((struct fd_softc *)); 202 void fddmastart __P((struct fd_softc *, int)); 203 void fdcalibrate __P((void *)); 204 void fddmadone __P((struct fd_softc *, int)); 205 void fddone __P((struct fd_softc *)); 206 void fdfindwork __P((int)); 207 void fdminphys __P((struct buf *)); 208 void fdcachetoraw __P((struct fd_softc *)); 209 void amcachetoraw __P((struct fd_softc *)); 210 int amrawtocache __P((struct fd_softc *)); 211 u_long *fdfindsync __P((u_long *, u_long *)); 212 int fdrawtocache __P((struct fd_softc *)); 213 void mscachetoraw __P((struct fd_softc *)); 214 int msrawtocache __P((struct fd_softc *)); 215 u_long *mfmblkencode __P((u_long *, u_long *, u_long *, int)); 216 u_long *mfmblkdecode __P((u_long *, u_long *, u_long *, int)); 217 u_short *msblkdecode __P((u_short *, u_char *, int)); 218 u_short *msblkencode __P((u_short *, u_char *, int, u_short *)); 219 220 struct dkdriver fddkdriver = { fdstrategy }; 221 222 /* 223 * read size is (nsectors + 1) * mfm secsize + gap bytes + 2 shorts 224 * write size is nsectors * mfm secsize + gap bytes + 3 shorts 225 * the extra shorts are to deal with a dma hw bug in the controller 226 * they are probably too much (I belive the bug is 1 short on write and 227 * 3 bits on read) but there is no need to be cheap here. 228 */ 229 #define MAXTRKSZ (22 * FDSECSIZE) 230 struct fdtype fdtype[] = { 231 { 0x00000000, 80, 11, 9, 7358, 6815, 414, { 80, 161 }, "3.5dd" }, 232 { 0x55555555, 40, 11, 9, 7358, 6815, 414, { 80, 161 }, "5.25dd" }, 233 { 0xAAAAAAAA, 80, 22, 18, 14716, 13630, 828, { 80, 161 }, "3.5hd" } 234 }; 235 int nfdtype = sizeof(fdtype) / sizeof(*fdtype); 236 237 struct cfattach fd_ca = { 238 sizeof(struct fd_softc), fdmatch, fdattach 239 }; 240 241 struct cfdriver fd_cd = { 242 NULL, "fd", DV_DISK, NULL, 0 243 }; 244 245 struct cfattach fdc_ca = { 246 sizeof(struct device), fdcmatch, fdcattach 247 }; 248 249 struct cfdriver fdc_cd = { 250 NULL, "fdc", DV_DULL, NULL, 0 251 }; 252 253 /* 254 * all hw access through macros, this helps to hide the active low 255 * properties 256 */ 257 258 #define FDUNITMASK(unit) (1 << (3 + (unit))) 259 260 /* 261 * select units using mask 262 */ 263 #define FDSELECT(um) do { ciab.prb &= ~(um); } while (0) 264 265 /* 266 * deselect units using mask 267 */ 268 #define FDDESELECT(um) do { ciab.prb |= (um); delay(1); } while (0) 269 270 /* 271 * test hw condition bits 272 */ 273 #define FDTESTC(bit) ((ciaa.pra & (1 << (bit))) == 0) 274 275 /* 276 * set motor for select units, true motor on else off 277 */ 278 #define FDSETMOTOR(on) do { \ 279 if (on) ciab.prb &= ~CIAB_PRB_MTR; else ciab.prb |= CIAB_PRB_MTR; \ 280 } while (0) 281 282 /* 283 * set head for select units 284 */ 285 #define FDSETHEAD(head) do { \ 286 if (head) ciab.prb &= ~CIAB_PRB_SIDE; else ciab.prb |= CIAB_PRB_SIDE; \ 287 delay(1); } while (0) 288 289 /* 290 * select direction, true towards spindle else outwards 291 */ 292 #define FDSETDIR(in) do { \ 293 if (in) ciab.prb &= ~CIAB_PRB_DIR; else ciab.prb |= CIAB_PRB_DIR; \ 294 delay(1); } while (0) 295 296 /* 297 * step the selected units 298 */ 299 #define FDSTEP do { \ 300 ciab.prb &= ~CIAB_PRB_STEP; ciab.prb |= CIAB_PRB_STEP; \ 301 } while (0) 302 303 #define FDDMASTART(len, towrite) do { \ 304 int dmasz = (len) | ((towrite) ? DISKLEN_WRITE : 0) | DISKLEN_DMAEN; \ 305 custom.dsklen = dmasz; custom.dsklen = dmasz; } while (0) 306 307 #define FDDMASTOP do { custom.dsklen = 0; } while (0) 308 309 310 int 311 fdcmatch(pdp, cfp, auxp) 312 struct device *pdp; 313 struct cfdata *cfp; 314 void *auxp; 315 { 316 317 if (matchname("fdc", auxp) == 0 || cfp->cf_unit != 0) 318 return(0); 319 if ((fdc_dmap = alloc_chipmem(DMABUFSZ)) == NULL) { 320 printf("fdc: unable to allocate dma buffer\n"); 321 return(0); 322 } 323 return(1); 324 } 325 326 void 327 fdcattach(pdp, dp, auxp) 328 struct device *pdp, *dp; 329 void *auxp; 330 { 331 struct fdcargs args; 332 333 printf(": dmabuf pa 0x%x", kvtop(fdc_dmap)); 334 printf(": dmabuf ka %p\n", fdc_dmap); 335 args.unit = 0; 336 args.type = fdcgetfdtype(args.unit); 337 338 fdc_side = -1; 339 config_found(dp, &args, fdcprint); 340 for (args.unit++; args.unit < FDMAXUNITS; args.unit++) { 341 if ((args.type = fdcgetfdtype(args.unit)) == NULL) 342 continue; 343 config_found(dp, &args, fdcprint); 344 } 345 } 346 347 int 348 fdcprint(auxp, pnp) 349 void *auxp; 350 const char *pnp; 351 { 352 struct fdcargs *fcp; 353 354 fcp = auxp; 355 if (pnp) 356 printf("fd%d at %s unit %d:", fcp->unit, pnp, 357 fcp->type->driveid); 358 return(UNCONF); 359 } 360 361 /*ARGSUSED*/ 362 int 363 fdmatch(pdp, cfp, auxp) 364 struct device *pdp; 365 struct cfdata *cfp; 366 void *auxp; 367 { 368 369 #define cf_unit cf_loc[0] 370 struct fdcargs *fdap; 371 372 fdap = auxp; 373 if (cfp->cf_unit == fdap->unit || cfp->cf_unit == -1) 374 return(1); 375 return(0); 376 #undef cf_unit 377 } 378 379 void 380 fdattach(pdp, dp, auxp) 381 struct device *pdp, *dp; 382 void *auxp; 383 { 384 struct fdcargs *ap; 385 struct fd_softc *sc; 386 int i; 387 388 ap = auxp; 389 sc = (struct fd_softc *)dp; 390 391 sc->curcyl = sc->cachetrk = -1; 392 sc->openpart = -1; 393 sc->type = ap->type; 394 sc->hwunit = ap->unit; 395 sc->unitmask = 1 << (3 + ap->unit); 396 sc->retries = FDRETRIES; 397 sc->stepdelay = FDSTEPDELAY; 398 sc->bytespersec = 512; 399 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 400 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 401 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 402 403 /* 404 * Initialize and attach the disk structure. 405 */ 406 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 407 sc->dkdev.dk_driver = &fddkdriver; 408 disk_attach(&sc->dkdev); 409 410 /* 411 * calibrate the drive 412 */ 413 fdsetpos(sc, 0, 0); 414 fdsetpos(sc, sc->type->ncylinders, 0); 415 fdsetpos(sc, 0, 0); 416 fdmotoroff(sc); 417 418 /* 419 * precalc msdos MFM and CRC 420 */ 421 for (i = 0; i < 128; i++) 422 msdecode[i] = 0xff; 423 for (i = 0; i < 16; i++) 424 msdecode[msencode[i]] = i; 425 for (i = 0; i < 256; i++) { 426 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 427 (0x1021 * (i >> 4)); 428 } 429 430 /* 431 * enable disk related interrupts 432 */ 433 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 434 custom.intena = INTF_SETCLR | INTF_DSKBLK; 435 ciab.icr = CIA_ICR_FLG; 436 } 437 438 /*ARGSUSED*/ 439 int 440 fdopen(dev, flags, devtype, p) 441 dev_t dev; 442 int flags, devtype; 443 struct proc *p; 444 { 445 struct fd_softc *sc; 446 int wasopen, fwork, error, s; 447 448 error = 0; 449 450 if (FDPART(dev) >= FDMAXPARTS) 451 return(ENXIO); 452 453 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 454 return(ENXIO); 455 if (sc->flags & FDF_NOTRACK0) 456 return(ENXIO); 457 if (sc->cachep == NULL) 458 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 459 460 s = splbio(); 461 /* 462 * if we are sleeping in fdclose(); waiting for a chance to 463 * shut the motor off, do a sleep here also. 464 */ 465 while (sc->flags & FDF_WMOTOROFF) 466 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 467 468 fwork = 0; 469 /* 470 * if not open let user open request type, otherwise 471 * ensure they are trying to open same type. 472 */ 473 if (sc->openpart == FDPART(dev)) 474 wasopen = 1; 475 else if (sc->openpart == -1) { 476 sc->openpart = FDPART(dev); 477 wasopen = 0; 478 } else { 479 wasopen = 1; 480 error = EPERM; 481 goto done; 482 } 483 484 /* 485 * wait for current io to complete if any 486 */ 487 if (fdc_indma) { 488 fwork = 1; 489 fdc_wantwakeup++; 490 tsleep(fdopen, PRIBIO, "fdopen", 0); 491 } 492 if ((error = fdloaddisk(sc)) != 0) 493 goto done; 494 if ((error = fdgetdisklabel(sc, dev)) != 0) 495 goto done; 496 #ifdef FDDEBUG 497 printf(" open successful\n"); 498 #endif 499 done: 500 /* 501 * if we requested that fddone()->fdfindwork() wake us, allow it to 502 * complete its job now 503 */ 504 if (fwork) 505 fdfindwork(FDUNIT(dev)); 506 splx(s); 507 508 /* 509 * if we were not open and we marked us so reverse that. 510 */ 511 if (error && wasopen == 0) 512 sc->openpart = -1; 513 return(error); 514 } 515 516 /*ARGSUSED*/ 517 int 518 fdclose(dev, flags, devtype, p) 519 dev_t dev; 520 int flags, devtype; 521 struct proc *p; 522 { 523 struct fd_softc *sc; 524 int s; 525 526 #ifdef FDDEBUG 527 printf("fdclose()\n"); 528 #endif 529 sc = getsoftc(fd_cd, FDUNIT(dev)); 530 s = splbio(); 531 if (sc->flags & FDF_MOTORON) { 532 sc->flags |= FDF_WMOTOROFF; 533 tsleep(fdmotoroff, PRIBIO, "fdclose", 0); 534 sc->flags &= ~FDF_WMOTOROFF; 535 wakeup(fdmotoroff); 536 } 537 sc->openpart = -1; 538 splx(s); 539 return(0); 540 } 541 542 int 543 fdioctl(dev, cmd, addr, flag, p) 544 dev_t dev; 545 u_long cmd; 546 caddr_t addr; 547 int flag; 548 struct proc *p; 549 { 550 struct fd_softc *sc; 551 int error, wlab; 552 553 sc = getsoftc(fd_cd, FDUNIT(dev)); 554 555 if ((sc->flags & FDF_HAVELABEL) == 0) 556 return(EBADF); 557 558 switch (cmd) { 559 case DIOCSBAD: 560 return(EINVAL); 561 case DIOCSRETRIES: 562 if (*(int *)addr < 0) 563 return(EINVAL); 564 sc->retries = *(int *)addr; 565 return(0); 566 case DIOCSSTEP: 567 if (*(int *)addr < FDSTEPDELAY) 568 return(EINVAL); 569 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 570 return(0); 571 case DIOCGDINFO: 572 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 573 return(0); 574 case DIOCGPART: 575 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 576 ((struct partinfo *)addr)->part = 577 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 578 return(0); 579 case DIOCSDINFO: 580 if ((flag & FWRITE) == 0) 581 return(EBADF); 582 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 583 case DIOCWDINFO: 584 if ((flag & FWRITE) == 0) 585 return(EBADF); 586 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 587 return(error); 588 wlab = sc->wlabel; 589 sc->wlabel = 1; 590 error = fdputdisklabel(sc, dev); 591 sc->wlabel = wlab; 592 return(error); 593 case DIOCWLABEL: 594 if ((flag & FWRITE) == 0) 595 return(EBADF); 596 sc->wlabel = *(int *)addr; 597 return(0); 598 default: 599 return(ENOTTY); 600 } 601 } 602 603 /* 604 * no dumps to floppy disks thank you. 605 */ 606 int 607 fdsize(dev) 608 dev_t dev; 609 { 610 return(-1); 611 } 612 613 int 614 fdread(dev, uio, flags) 615 dev_t dev; 616 struct uio *uio; 617 int flags; 618 { 619 return (physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 620 } 621 622 int 623 fdwrite(dev, uio, flags) 624 dev_t dev; 625 struct uio *uio; 626 int flags; 627 { 628 return (physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 629 } 630 631 632 void 633 fdintr(flag) 634 int flag; 635 { 636 int s; 637 638 s = splbio(); 639 if (fdc_indma) 640 fddmadone(fdc_indma, 0); 641 splx(s); 642 } 643 644 void 645 fdidxintr() 646 { 647 if (fdc_indma && fdc_dmalen) { 648 /* 649 * turn off intr and start actual dma 650 */ 651 ciab.icr = CIA_ICR_FLG; 652 FDDMASTART(fdc_dmalen, fdc_dmawrite); 653 fdc_dmalen = 0; 654 } 655 } 656 657 void 658 fdstrategy(bp) 659 struct buf *bp; 660 { 661 struct disklabel *lp; 662 struct fd_softc *sc; 663 struct buf *dp; 664 int unit, part, s; 665 666 unit = FDUNIT(bp->b_dev); 667 part = FDPART(bp->b_dev); 668 sc = getsoftc(fd_cd, unit); 669 670 #ifdef FDDEBUG 671 printf("fdstrategy: 0x%x\n", bp); 672 #endif 673 /* 674 * check for valid partition and bounds 675 */ 676 lp = sc->dkdev.dk_label; 677 if ((sc->flags & FDF_HAVELABEL) == 0) { 678 bp->b_error = EIO; 679 goto bad; 680 } 681 if (bounds_check_with_label(bp, lp, sc->wlabel) <= 0) 682 goto done; 683 684 /* 685 * trans count of zero or bounds check indicates io is done 686 * we are done. 687 */ 688 if (bp->b_bcount == 0) 689 goto done; 690 691 /* 692 * queue the buf and kick the low level code 693 */ 694 s = splbio(); 695 dp = &sc->bufq; 696 disksort(dp, bp); 697 fdstart(sc); 698 splx(s); 699 return; 700 bad: 701 bp->b_flags |= B_ERROR; 702 done: 703 bp->b_resid = bp->b_bcount; 704 biodone(bp); 705 } 706 707 /* 708 * make sure disk is loaded and label is up-to-date. 709 */ 710 int 711 fdloaddisk(sc) 712 struct fd_softc *sc; 713 { 714 /* 715 * if diskchange is low step drive to 0 then up one then to zero. 716 */ 717 fdselunit(sc); /* make sure the unit is selected */ 718 if (FDTESTC(FDB_CHANGED)) { 719 fdsetpos(sc, 0, 0); 720 sc->cachetrk = -1; /* invalidate the cache */ 721 sc->flags &= ~FDF_HAVELABEL; 722 fdsetpos(sc, FDNHEADS, 0); 723 fdsetpos(sc, 0, 0); 724 if (FDTESTC(FDB_CHANGED)) { 725 fdmotoroff(sc); 726 FDDESELECT(sc->unitmask); 727 return(ENXIO); 728 } 729 } 730 FDDESELECT(sc->unitmask); 731 fdmotoroff(sc); 732 sc->type = fdcgetfdtype(sc->hwunit); 733 if (sc->type == NULL) 734 return(ENXIO); 735 if (sc->openpart == FDMSDOSPART) 736 sc->nsectors = sc->type->msdos_nsectors; 737 else 738 sc->nsectors = sc->type->amiga_nsectors; 739 return(0); 740 } 741 742 /* 743 * read disk label, if present otherwise create one 744 * return a new label if raw part and none found, otherwise err. 745 */ 746 int 747 fdgetdisklabel(sc, dev) 748 struct fd_softc *sc; 749 dev_t dev; 750 { 751 struct disklabel *lp, *dlp; 752 struct cpu_disklabel *clp; 753 struct buf *bp; 754 int error, part; 755 756 if (sc->flags & FDF_HAVELABEL && 757 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 758 return(0); 759 #ifdef FDDEBUG 760 printf("fdgetdisklabel()\n"); 761 #endif 762 part = FDPART(dev); 763 lp = sc->dkdev.dk_label; 764 clp = sc->dkdev.dk_cpulabel; 765 bzero(lp, sizeof(struct disklabel)); 766 bzero(clp, sizeof(struct cpu_disklabel)); 767 768 lp->d_secsize = FDSECSIZE; 769 lp->d_ntracks = FDNHEADS; 770 lp->d_ncylinders = sc->type->ncylinders; 771 lp->d_nsectors = sc->nsectors; 772 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 773 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 774 lp->d_npartitions = part + 1; 775 lp->d_partitions[part].p_size = lp->d_secperunit; 776 lp->d_partitions[part].p_fstype = FS_UNUSED; 777 lp->d_partitions[part].p_fsize = 1024; 778 lp->d_partitions[part].p_frag = 8; 779 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 780 781 sc->flags |= FDF_HAVELABEL; 782 783 bp = (void *)geteblk((int)lp->d_secsize); 784 bp->b_dev = dev; 785 bp->b_blkno = 0; 786 bp->b_cylin = 0; 787 bp->b_bcount = FDSECSIZE; 788 bp->b_flags = B_BUSY | B_READ; 789 fdstrategy(bp); 790 if ((error = biowait(bp)) != 0) 791 goto nolabel; 792 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 793 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 794 dkcksum(dlp)) { 795 error = EINVAL; 796 goto nolabel; 797 } 798 bcopy(dlp, lp, sizeof(struct disklabel)); 799 if (lp->d_trkseek > FDSTEPDELAY) 800 sc->stepdelay = lp->d_trkseek; 801 brelse(bp); 802 return(0); 803 nolabel: 804 bzero(lp, sizeof(struct disklabel)); 805 lp->d_secsize = FDSECSIZE; 806 lp->d_ntracks = FDNHEADS; 807 lp->d_ncylinders = sc->type->ncylinders; 808 lp->d_nsectors = sc->nsectors; 809 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 810 lp->d_type = DTYPE_FLOPPY; 811 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 812 lp->d_rpm = 300; /* good guess I suppose. */ 813 lp->d_interleave = 1; /* should change when adding msdos */ 814 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 815 lp->d_bbsize = 0; 816 lp->d_sbsize = 0; 817 lp->d_partitions[part].p_size = lp->d_secperunit; 818 lp->d_partitions[part].p_fstype = FS_UNUSED; 819 lp->d_partitions[part].p_fsize = 1024; 820 lp->d_partitions[part].p_frag = 8; 821 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 822 lp->d_npartitions = part + 1; 823 lp->d_magic = lp->d_magic2 = DISKMAGIC; 824 lp->d_checksum = dkcksum(lp); 825 brelse(bp); 826 return(0); 827 } 828 829 /* 830 * set the incore copy of this units disklabel 831 */ 832 int 833 fdsetdisklabel(sc, lp) 834 struct fd_softc *sc; 835 struct disklabel *lp; 836 { 837 struct disklabel *clp; 838 struct partition *pp; 839 840 /* 841 * must have at least opened raw unit to fetch the 842 * raw_part stuff. 843 */ 844 if ((sc->flags & FDF_HAVELABEL) == 0) 845 return(EINVAL); 846 clp = sc->dkdev.dk_label; 847 /* 848 * make sure things check out and we only have one valid 849 * partition 850 */ 851 #ifdef FDDEBUG 852 printf("fdsetdisklabel\n"); 853 #endif 854 if (lp->d_secsize != FDSECSIZE || 855 lp->d_nsectors != clp->d_nsectors || 856 lp->d_ntracks != FDNHEADS || 857 lp->d_ncylinders != clp->d_ncylinders || 858 lp->d_secpercyl != clp->d_secpercyl || 859 lp->d_secperunit != clp->d_secperunit || 860 lp->d_magic != DISKMAGIC || 861 lp->d_magic2 != DISKMAGIC || 862 lp->d_npartitions == 0 || 863 lp->d_npartitions > FDMAXPARTS || 864 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 865 dkcksum(lp)) 866 return(EINVAL); 867 /* 868 * if any partitions are present make sure they 869 * represent the currently open type 870 */ 871 if ((pp = &lp->d_partitions[0])->p_size) { 872 if ((pp = &lp->d_partitions[1])->p_size == 0) 873 goto done; 874 else if (sc->openpart != 1) 875 return(EINVAL); 876 } else if (sc->openpart != 0) 877 return(EINVAL); 878 /* 879 * make sure selected partition is within bounds 880 * XXX on the second check, its to handle a bug in 881 * XXX the cluster routines as they require mutliples 882 * XXX of CLBYTES currently 883 */ 884 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 885 (pp->p_frag * pp->p_fsize % CLBYTES)) 886 return(EINVAL); 887 done: 888 bcopy(lp, clp, sizeof(struct disklabel)); 889 return(0); 890 } 891 892 /* 893 * write out the incore copy of this units disklabel 894 */ 895 int 896 fdputdisklabel(sc, dev) 897 struct fd_softc *sc; 898 dev_t dev; 899 { 900 struct disklabel *lp, *dlp; 901 struct buf *bp; 902 int error; 903 904 if ((sc->flags & FDF_HAVELABEL) == 0) 905 return(EBADF); 906 #ifdef FDDEBUG 907 printf("fdputdisklabel\n"); 908 #endif 909 /* 910 * get buf and read in sector 0 911 */ 912 lp = sc->dkdev.dk_label; 913 bp = (void *)geteblk((int)lp->d_secsize); 914 bp->b_dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 915 bp->b_blkno = 0; 916 bp->b_cylin = 0; 917 bp->b_bcount = FDSECSIZE; 918 bp->b_flags = B_BUSY | B_READ; 919 fdstrategy(bp); 920 if ((error = biowait(bp)) != 0) 921 goto done; 922 /* 923 * copy disklabel to buf and write it out syncronous 924 */ 925 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 926 bcopy(lp, dlp, sizeof(struct disklabel)); 927 bp->b_blkno = 0; 928 bp->b_cylin = 0; 929 bp->b_flags = B_WRITE; 930 fdstrategy(bp); 931 error = biowait(bp); 932 done: 933 brelse(bp); 934 return(error); 935 } 936 937 /* 938 * figure out drive type or NULL if none. 939 */ 940 struct fdtype * 941 fdcgetfdtype(unit) 942 int unit; 943 { 944 struct fdtype *ftp; 945 u_long id, idb; 946 int cnt, umask; 947 948 id = 0; 949 umask = 1 << (3 + unit); 950 951 FDDESELECT(FDCUNITMASK); 952 953 FDSETMOTOR(1); 954 delay(1); 955 FDSELECT(umask); 956 delay(1); 957 FDDESELECT(umask); 958 959 FDSETMOTOR(0); 960 delay(1); 961 FDSELECT(umask); 962 delay(1); 963 FDDESELECT(umask); 964 965 for (idb = 0x80000000; idb; idb >>= 1) { 966 FDSELECT(umask); 967 delay(1); 968 if (FDTESTC(FDB_READY) == 0) 969 id |= idb; 970 FDDESELECT(umask); 971 delay(1); 972 } 973 #ifdef FDDEBUG 974 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 975 #endif 976 977 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 978 if (ftp->driveid == id) 979 return(ftp); 980 /* 981 * 3.5dd's at unit 0 do not always return id. 982 */ 983 if (unit == 0) 984 return(fdtype); 985 return(NULL); 986 } 987 988 /* 989 * turn motor off if possible otherwise mark as needed and will be done 990 * later. 991 */ 992 void 993 fdmotoroff(arg) 994 void *arg; 995 { 996 struct fd_softc *sc; 997 int s; 998 999 sc = arg; 1000 s = splbio(); 1001 1002 #ifdef FDDEBUG 1003 printf("fdmotoroff: unit %d\n", sc->hwunit); 1004 #endif 1005 if ((sc->flags & FDF_MOTORON) == 0) 1006 goto done; 1007 /* 1008 * if we have a timeout on a dma operation let fddmadone() 1009 * deal with it. 1010 */ 1011 if (fdc_indma == sc) { 1012 fddmadone(sc, 1); 1013 goto done; 1014 } 1015 #ifdef FDDEBUG 1016 printf(" motor was on, turning off\n"); 1017 #endif 1018 1019 /* 1020 * flush cache if needed 1021 */ 1022 if (sc->flags & FDF_DIRTY) { 1023 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1024 #ifdef FDDEBUG 1025 printf(" flushing dirty buffer first\n"); 1026 #endif 1027 /* 1028 * if dma'ing done for now, fddone() will call us again 1029 */ 1030 if (fdc_indma) 1031 goto done; 1032 fddmastart(sc, sc->cachetrk); 1033 goto done; 1034 } 1035 1036 /* 1037 * if controller is busy just schedule us to be called back 1038 */ 1039 if (fdc_indma) { 1040 /* 1041 * someone else has the controller now 1042 * just set flag and let fddone() call us again. 1043 */ 1044 sc->flags |= FDF_MOTOROFF; 1045 goto done; 1046 } 1047 1048 #ifdef FDDEBUG 1049 printf(" hw turning unit off\n"); 1050 #endif 1051 1052 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1053 FDDESELECT(FDCUNITMASK); 1054 FDSETMOTOR(0); 1055 delay(1); 1056 FDSELECT(sc->unitmask); 1057 delay(4); 1058 FDDESELECT(sc->unitmask); 1059 delay(1); 1060 if (sc->flags & FDF_WMOTOROFF) 1061 wakeup(fdmotoroff); 1062 done: 1063 splx(s); 1064 } 1065 1066 /* 1067 * select drive seek to track exit with motor on. 1068 * fdsetpos(x, 0, 0) does calibrates the drive. 1069 */ 1070 void 1071 fdsetpos(sc, trk, towrite) 1072 struct fd_softc *sc; 1073 int trk, towrite; 1074 { 1075 int nstep, sdir, ondly, ncyl, nside; 1076 1077 FDDESELECT(FDCUNITMASK); 1078 FDSETMOTOR(1); 1079 delay(1); 1080 FDSELECT(sc->unitmask); 1081 delay(1); 1082 if ((sc->flags & FDF_MOTORON) == 0) { 1083 ondly = 0; 1084 while (FDTESTC(FDB_READY) == 0) { 1085 delay(1000); 1086 if (++ondly >= 1000) 1087 break; 1088 } 1089 } 1090 sc->flags |= FDF_MOTORON; 1091 1092 ncyl = trk / FDNHEADS; 1093 nside = trk % FDNHEADS; 1094 1095 if (sc->curcyl == ncyl && fdc_side == nside) 1096 return; 1097 1098 if (towrite) 1099 sc->flags |= FDF_WRITEWAIT; 1100 1101 #ifdef FDDEBUG 1102 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1103 trk % FDNHEADS, towrite); 1104 #endif 1105 nstep = ncyl - sc->curcyl; 1106 if (nstep) { 1107 /* 1108 * figure direction 1109 */ 1110 if (nstep > 0 && ncyl != 0) { 1111 sdir = FDSTEPIN; 1112 FDSETDIR(1); 1113 } else { 1114 nstep = -nstep; 1115 sdir = FDSTEPOUT; 1116 FDSETDIR(0); 1117 } 1118 if (ncyl == 0) { 1119 /* 1120 * either just want cylinder 0 or doing 1121 * a calibrate. 1122 */ 1123 nstep = 256; 1124 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1125 FDSTEP; 1126 delay(sc->stepdelay); 1127 } 1128 if (nstep < 0) 1129 sc->flags |= FDF_NOTRACK0; 1130 } else { 1131 /* 1132 * step the needed amount amount. 1133 */ 1134 while (nstep--) { 1135 FDSTEP; 1136 delay(sc->stepdelay); 1137 } 1138 } 1139 /* 1140 * if switched directions 1141 * allow drive to settle. 1142 */ 1143 if (sc->pstepdir != sdir) 1144 delay(FDSETTLEDELAY); 1145 sc->pstepdir = sdir; 1146 sc->curcyl = ncyl; 1147 } 1148 if (nside == fdc_side) 1149 return; 1150 /* 1151 * select side 1152 */ 1153 fdc_side = nside; 1154 FDSETHEAD(nside); 1155 delay(FDPRESIDEDELAY); 1156 } 1157 1158 void 1159 fdselunit(sc) 1160 struct fd_softc *sc; 1161 { 1162 FDDESELECT(FDCUNITMASK); /* deselect all */ 1163 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1164 delay(1); 1165 FDSELECT(sc->unitmask); /* select unit */ 1166 delay(1); 1167 } 1168 1169 /* 1170 * process next buf on device queue. 1171 * normall sequence of events: 1172 * fdstart() -> fddmastart(); 1173 * fdidxintr(); 1174 * fdintr() -> fddmadone() -> fddone(); 1175 * if the track is in the cache then fdstart() will short-circuit 1176 * to fddone() else if the track cache is dirty it will flush. If 1177 * the buf is not an entire track it will cache the requested track. 1178 */ 1179 void 1180 fdstart(sc) 1181 struct fd_softc *sc; 1182 { 1183 int trk, error, write; 1184 struct buf *bp, *dp; 1185 int changed; 1186 1187 #ifdef FDDEBUG 1188 printf("fdstart: unit %d\n", sc->hwunit); 1189 #endif 1190 1191 /* 1192 * if dma'ing just return. we must have been called from fdstartegy. 1193 */ 1194 if (fdc_indma) 1195 return; 1196 1197 /* 1198 * get next buf if there. 1199 */ 1200 dp = &sc->bufq; 1201 if ((bp = dp->b_actf) == NULL) { 1202 #ifdef FDDEBUG 1203 printf(" nothing to do\n"); 1204 #endif 1205 return; 1206 } 1207 1208 /* 1209 * Mark us as busy now, in case fddone() gets called in one 1210 * of the cases below. 1211 */ 1212 disk_busy(&sc->dkdev); 1213 1214 /* 1215 * make sure same disk is loaded 1216 */ 1217 fdselunit(sc); 1218 changed = FDTESTC(FDB_CHANGED); 1219 FDDESELECT(sc->unitmask); 1220 if (changed) { 1221 /* 1222 * disk missing, invalidate all future io on 1223 * this unit until re-open()'ed also invalidate 1224 * all current io 1225 */ 1226 printf("fdstart: disk changed\n"); 1227 #ifdef FDDEBUG 1228 printf(" disk was removed invalidating all io\n"); 1229 #endif 1230 sc->flags &= ~FDF_HAVELABEL; 1231 for (;;) { 1232 bp->b_flags |= B_ERROR; 1233 bp->b_error = EIO; 1234 if (bp->b_actf == NULL) 1235 break; 1236 biodone(bp); 1237 bp = bp->b_actf; 1238 } 1239 /* 1240 * do fddone() on last buf to allow other units to start. 1241 */ 1242 dp->b_actf = bp; 1243 fddone(sc); 1244 return; 1245 } 1246 1247 /* 1248 * we have a valid buf, setup our local version 1249 * we use this count to allow reading over multiple tracks. 1250 * into a single buffer 1251 */ 1252 dp->b_bcount = bp->b_bcount; 1253 dp->b_blkno = bp->b_blkno; 1254 dp->b_data = bp->b_data; 1255 dp->b_flags = bp->b_flags; 1256 dp->b_resid = 0; 1257 1258 if (bp->b_flags & B_READ) 1259 write = 0; 1260 else if (FDTESTC(FDB_PROTECT) == 0) 1261 write = 1; 1262 else { 1263 error = EPERM; 1264 goto bad; 1265 } 1266 1267 /* 1268 * figure trk given blkno 1269 */ 1270 trk = bp->b_blkno / sc->nsectors; 1271 1272 /* 1273 * check to see if same as currently cached track 1274 * if so we need to do no dma read. 1275 */ 1276 if (trk == sc->cachetrk) { 1277 fddone(sc); 1278 return; 1279 } 1280 1281 /* 1282 * if we will be overwriting the entire cache, don't bother to 1283 * fetch it. 1284 */ 1285 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1286 bp->b_blkno % sc->nsectors == 0) { 1287 if (sc->flags & FDF_DIRTY) 1288 sc->flags |= FDF_JUSTFLUSH; 1289 else { 1290 sc->cachetrk = trk; 1291 fddone(sc); 1292 return; 1293 } 1294 } 1295 1296 /* 1297 * start dma read of `trk' 1298 */ 1299 fddmastart(sc, trk); 1300 return; 1301 bad: 1302 bp->b_flags |= B_ERROR; 1303 bp->b_error = error; 1304 fddone(sc); 1305 } 1306 1307 /* 1308 * continue a started operation on next track. always begin at 1309 * sector 0 on the next track. 1310 */ 1311 void 1312 fdcont(sc) 1313 struct fd_softc *sc; 1314 { 1315 struct buf *dp, *bp; 1316 int trk, write; 1317 1318 dp = &sc->bufq; 1319 bp = dp->b_actf; 1320 dp->b_data += (dp->b_bcount - bp->b_resid); 1321 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1322 dp->b_bcount = bp->b_resid; 1323 1324 /* 1325 * figure trk given blkno 1326 */ 1327 trk = dp->b_blkno / sc->nsectors; 1328 #ifdef DEBUG 1329 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1330 panic("fdcont: confused"); 1331 #endif 1332 if (dp->b_flags & B_READ) 1333 write = 0; 1334 else 1335 write = 1; 1336 /* 1337 * if we will be overwriting the entire cache, don't bother to 1338 * fetch it. 1339 */ 1340 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1341 if (sc->flags & FDF_DIRTY) 1342 sc->flags |= FDF_JUSTFLUSH; 1343 else { 1344 sc->cachetrk = trk; 1345 fddone(sc); 1346 return; 1347 } 1348 } 1349 /* 1350 * start dma read of `trk' 1351 */ 1352 fddmastart(sc, trk); 1353 return; 1354 } 1355 1356 void 1357 fddmastart(sc, trk) 1358 struct fd_softc *sc; 1359 int trk; 1360 { 1361 int adkmask, ndmaw, write, dmatrk; 1362 1363 #ifdef FDDEBUG 1364 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1365 trk / FDNHEADS, trk % FDNHEADS); 1366 #endif 1367 /* 1368 * flush the cached track if dirty else read requested track. 1369 */ 1370 if (sc->flags & FDF_DIRTY) { 1371 fdcachetoraw(sc); 1372 ndmaw = sc->type->nwritew; 1373 dmatrk = sc->cachetrk; 1374 write = 1; 1375 } else { 1376 ndmaw = sc->type->nreadw; 1377 dmatrk = trk; 1378 write = 0; 1379 } 1380 1381 #ifdef FDDEBUG 1382 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1383 #endif 1384 sc->cachetrk = trk; 1385 fdc_indma = sc; 1386 fdsetpos(sc, dmatrk, write); 1387 1388 /* 1389 * setup dma stuff 1390 */ 1391 if (write == 0) { 1392 custom.adkcon = ADKF_MSBSYNC; 1393 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1394 custom.dsksync = FDMFMSYNC; 1395 } else { 1396 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1397 ADKF_MSBSYNC; 1398 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1399 if (dmatrk >= sc->type->precomp[0]) 1400 adkmask |= ADKF_PRECOMP0; 1401 if (dmatrk >= sc->type->precomp[1]) 1402 adkmask |= ADKF_PRECOMP1; 1403 custom.adkcon = adkmask; 1404 } 1405 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1406 1407 /* 1408 * If writing an MSDOS track, activate disk index pulse 1409 * interrupt, dma will be started in the intr routine fdidxintr() 1410 * Otherwise, start the DMA here. 1411 */ 1412 if (write && sc->openpart == FDMSDOSPART) { 1413 fdc_dmalen = ndmaw; 1414 fdc_dmawrite = write; 1415 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1416 } else { 1417 FDDMASTART(ndmaw, write); 1418 fdc_dmalen = 0; 1419 } 1420 1421 #ifdef FDDEBUG 1422 printf(" dma started\n"); 1423 #endif 1424 } 1425 1426 /* 1427 * recalibrate the drive 1428 */ 1429 void 1430 fdcalibrate(arg) 1431 void *arg; 1432 { 1433 struct fd_softc *sc; 1434 static int loopcnt; 1435 1436 sc = arg; 1437 1438 if (loopcnt == 0) { 1439 /* 1440 * seek cyl 0 1441 */ 1442 fdc_indma = sc; 1443 sc->stepdelay += 900; 1444 if (sc->cachetrk > 1) 1445 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1446 sc->stepdelay -= 900; 1447 } 1448 if (loopcnt++ & 1) 1449 fdsetpos(sc, sc->cachetrk, 0); 1450 else 1451 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1452 /* 1453 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1454 */ 1455 if (loopcnt < 8) 1456 timeout(fdcalibrate, sc, hz / 8); 1457 else { 1458 loopcnt = 0; 1459 fdc_indma = NULL; 1460 timeout(fdmotoroff, sc, 3 * hz / 2); 1461 fddmastart(sc, sc->cachetrk); 1462 } 1463 } 1464 1465 void 1466 fddmadone(sc, timeo) 1467 struct fd_softc *sc; 1468 int timeo; 1469 { 1470 #ifdef FDDEBUG 1471 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1472 #endif 1473 fdc_indma = NULL; 1474 untimeout(fdmotoroff, sc); 1475 FDDMASTOP; 1476 1477 /* 1478 * guarantee the drive has been at current head and cyl 1479 * for at least FDWRITEDELAY after a write. 1480 */ 1481 if (sc->flags & FDF_WRITEWAIT) { 1482 delay(FDWRITEDELAY); 1483 sc->flags &= ~FDF_WRITEWAIT; 1484 } 1485 1486 if ((sc->flags & FDF_MOTOROFF) == 0) { 1487 /* 1488 * motor runs for 1.5 seconds after last dma 1489 */ 1490 timeout(fdmotoroff, sc, 3 * hz / 2); 1491 } 1492 if (sc->flags & FDF_DIRTY) { 1493 /* 1494 * if buffer dirty, the last dma cleaned it 1495 */ 1496 sc->flags &= ~FDF_DIRTY; 1497 if (timeo) 1498 printf("%s: write of track cache timed out.\n", 1499 sc->sc_dv.dv_xname); 1500 if (sc->flags & FDF_JUSTFLUSH) { 1501 sc->flags &= ~FDF_JUSTFLUSH; 1502 /* 1503 * we are done dma'ing 1504 */ 1505 fddone(sc); 1506 return; 1507 } 1508 /* 1509 * load the cache 1510 */ 1511 fddmastart(sc, sc->cachetrk); 1512 return; 1513 } 1514 #ifdef FDDEBUG 1515 else if (sc->flags & FDF_MOTOROFF) 1516 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1517 #endif 1518 1519 /* 1520 * cache loaded decode it into cache buffer 1521 */ 1522 if (timeo == 0 && fdrawtocache(sc) == 0) 1523 sc->retried = 0; 1524 else { 1525 #ifdef FDDEBUG 1526 if (timeo) 1527 printf("%s: fddmadone: cache load timed out.\n", 1528 sc->sc_dv.dv_xname); 1529 #endif 1530 if (sc->retried >= sc->retries) { 1531 sc->retried = 0; 1532 sc->cachetrk = -1; 1533 } else { 1534 sc->retried++; 1535 /* 1536 * this will be restarted at end of calibrate loop. 1537 */ 1538 untimeout(fdmotoroff, sc); 1539 fdcalibrate(sc); 1540 return; 1541 } 1542 } 1543 fddone(sc); 1544 } 1545 1546 void 1547 fddone(sc) 1548 struct fd_softc *sc; 1549 { 1550 struct buf *dp, *bp; 1551 char *data; 1552 int sz; 1553 1554 #ifdef FDDEBUG 1555 printf("fddone: unit %d\n", sc->hwunit); 1556 #endif 1557 /* 1558 * check to see if unit is just flushing the cache, 1559 * that is we have no io queued. 1560 */ 1561 if (sc->flags & FDF_MOTOROFF) 1562 goto nobuf; 1563 1564 dp = &sc->bufq; 1565 if ((bp = dp->b_actf) == NULL) 1566 panic ("fddone"); 1567 /* 1568 * check for an error that may have occured 1569 * while getting the track. 1570 */ 1571 if (sc->cachetrk == -1) { 1572 sc->retried = 0; 1573 bp->b_flags |= B_ERROR; 1574 bp->b_error = EIO; 1575 } else if ((bp->b_flags & B_ERROR) == 0) { 1576 data = sc->cachep; 1577 /* 1578 * get offset of data in track cache and limit 1579 * the copy size to not exceed the cache's end. 1580 */ 1581 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1582 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1583 sz *= FDSECSIZE; 1584 sz = min(dp->b_bcount, sz); 1585 if (bp->b_flags & B_READ) 1586 bcopy(data, dp->b_data, sz); 1587 else { 1588 bcopy(dp->b_data, data, sz); 1589 sc->flags |= FDF_DIRTY; 1590 } 1591 bp->b_resid = dp->b_bcount - sz; 1592 if (bp->b_resid == 0) { 1593 bp->b_error = 0; 1594 } else { 1595 /* 1596 * not done yet need to read next track 1597 */ 1598 fdcont(sc); 1599 return; 1600 } 1601 } 1602 /* 1603 * remove from queue. 1604 */ 1605 dp->b_actf = bp->b_actf; 1606 1607 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1608 1609 biodone(bp); 1610 nobuf: 1611 fdfindwork(sc->sc_dv.dv_unit); 1612 } 1613 1614 void 1615 fdfindwork(unit) 1616 int unit; 1617 { 1618 struct fd_softc *ssc, *sc; 1619 int i, last; 1620 1621 /* 1622 * first see if we have any fdopen()'s waiting 1623 */ 1624 if (fdc_wantwakeup) { 1625 wakeup(fdopen); 1626 fdc_wantwakeup--; 1627 return; 1628 } 1629 1630 /* 1631 * start next available unit, linear search from the next unit 1632 * wrapping and finally this unit. 1633 */ 1634 last = 0; 1635 ssc = NULL; 1636 for (i = unit + 1; last == 0; i++) { 1637 if (i == unit) 1638 last = 1; 1639 if (i >= fd_cd.cd_ndevs) { 1640 i = -1; 1641 continue; 1642 } 1643 if ((sc = fd_cd.cd_devs[i]) == NULL) 1644 continue; 1645 1646 /* 1647 * if unit has requested to be turned off 1648 * and it has no buf's queued do it now 1649 */ 1650 if (sc->flags & FDF_MOTOROFF) { 1651 if (sc->bufq.b_actf == NULL) 1652 fdmotoroff(sc); 1653 else { 1654 /* 1655 * we gained a buf request while 1656 * we waited, forget the motoroff 1657 */ 1658 sc->flags &= ~FDF_MOTOROFF; 1659 } 1660 /* 1661 * if we now have dma unit must have needed 1662 * flushing, quit 1663 */ 1664 if (fdc_indma) 1665 return; 1666 } 1667 /* 1668 * if we have no start unit and the current unit has 1669 * io waiting choose this unit to start. 1670 */ 1671 if (ssc == NULL && sc->bufq.b_actf) 1672 ssc = sc; 1673 } 1674 if (ssc) 1675 fdstart(ssc); 1676 } 1677 1678 /* 1679 * min byte count to whats left of the track in question 1680 */ 1681 void 1682 fdminphys(bp) 1683 struct buf *bp; 1684 { 1685 struct fd_softc *sc; 1686 int trk, sec, toff, tsz; 1687 1688 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1689 panic("fdminphys: couldn't get softc"); 1690 1691 trk = bp->b_blkno / sc->nsectors; 1692 sec = bp->b_blkno % sc->nsectors; 1693 1694 toff = sec * FDSECSIZE; 1695 tsz = sc->nsectors * FDSECSIZE; 1696 #ifdef FDDEBUG 1697 printf("fdminphys: before %d", bp->b_bcount); 1698 #endif 1699 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1700 #ifdef FDDEBUG 1701 printf(" after %d\n", bp->b_bcount); 1702 #endif 1703 minphys(bp); 1704 } 1705 1706 /* 1707 * encode the track cache into raw MFM ready for dma 1708 * when we go to multiple disk formats, this will call type dependent 1709 * functions 1710 */ 1711 void fdcachetoraw(sc) 1712 struct fd_softc *sc; 1713 { 1714 if (sc->openpart == FDMSDOSPART) 1715 mscachetoraw(sc); 1716 else 1717 amcachetoraw(sc); 1718 } 1719 1720 /* 1721 * decode raw MFM from dma into units track cache. 1722 * when we go to multiple disk formats, this will call type dependent 1723 * functions 1724 */ 1725 int 1726 fdrawtocache(sc) 1727 struct fd_softc *sc; 1728 { 1729 1730 if (sc->openpart == FDMSDOSPART) 1731 return(msrawtocache(sc)); 1732 else 1733 return(amrawtocache(sc)); 1734 } 1735 1736 void 1737 amcachetoraw(sc) 1738 struct fd_softc *sc; 1739 { 1740 static u_long mfmnull[4]; 1741 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1742 int sec, i; 1743 1744 rp = fdc_dmap; 1745 1746 /* 1747 * not yet one sector (- 1 long) gap. 1748 * for now use previous drivers values 1749 */ 1750 for (i = 0; i < sc->type->gap; i++) 1751 *rp++ = 0xaaaaaaaa; 1752 /* 1753 * process sectors 1754 */ 1755 dp = sc->cachep; 1756 zero = 0; 1757 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1758 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1759 hcksum = dcksum = 0; 1760 /* 1761 * sector format 1762 * offset description 1763 *----------------------------------- 1764 * 0 null 1765 * 1 sync 1766 * oddbits evenbits 1767 *---------------------- 1768 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1769 * 4-7 8-11 null 1770 * 12 13 header cksum [2-11] 1771 * 14 15 data cksum [16-271] 1772 * 16-143 144-271 data 1773 */ 1774 *rp = 0xaaaaaaaa; 1775 if (*(rp - 1) & 0x1) 1776 *rp &= 0x7fffffff; /* clock bit correction */ 1777 rp++; 1778 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1779 rp = mfmblkencode(&info, rp, &hcksum, 1); 1780 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1781 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1782 1783 crp = rp; 1784 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1785 dp += FDSECLWORDS; 1786 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1787 if (*(crp - 1) & 0x1) 1788 *crp &= 0x7fffffff; /* clock bit correction */ 1789 else if ((*crp & 0x40000000) == 0) 1790 *crp |= 0x80000000; 1791 } 1792 *rp = 0xaaa80000; 1793 if (*(rp - 1) & 0x1) 1794 *rp &= 0x7fffffff; 1795 } 1796 1797 u_long * 1798 fdfindsync(rp, ep) 1799 u_long *rp, *ep; 1800 { 1801 u_short *sp; 1802 1803 sp = (u_short *)rp; 1804 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1805 sp++; 1806 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1807 sp++; 1808 if ((u_long *)sp < ep) 1809 return((u_long *)sp); 1810 return(NULL); 1811 } 1812 1813 int 1814 amrawtocache(sc) 1815 struct fd_softc *sc; 1816 { 1817 u_long mfmnull[4]; 1818 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1819 int cnt, doagain; 1820 1821 doagain = 1; 1822 srp = rp = fdc_dmap; 1823 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1824 cnt = 0; 1825 again: 1826 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1827 #ifdef DIAGNOSTIC 1828 printf("%s: corrupted track (%d) data.\n", 1829 sc->sc_dv.dv_xname, sc->cachetrk); 1830 #endif 1831 return(-1); 1832 } 1833 1834 /* 1835 * process sectors 1836 */ 1837 for (; cnt < sc->nsectors; cnt++) { 1838 hcksum = dcksum = 0; 1839 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1840 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1841 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1842 if (cktmp != hcksum) { 1843 #ifdef FDDEBUG 1844 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1845 info, hcksum, cktmp); 1846 #endif 1847 goto again; 1848 } 1849 if (((info >> 16) & 0xff) != sc->cachetrk) { 1850 #ifdef DEBUG 1851 printf("%s: incorrect track found: 0x%lx %d\n", 1852 sc->sc_dv.dv_xname, info, sc->cachetrk); 1853 #endif 1854 goto again; 1855 } 1856 #ifdef FDDEBUG 1857 printf(" info 0x%x\n", info); 1858 #endif 1859 1860 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1861 dp = sc->cachep; 1862 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1863 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1864 if (cktmp != dcksum) { 1865 #ifdef FDDEBUG 1866 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1867 info, dcksum, cktmp); 1868 #endif 1869 goto again; 1870 } 1871 1872 /* 1873 * if we are at gap then we can no longer be sure 1874 * of correct sync marks 1875 */ 1876 if ((info && 0xff) == 1) 1877 doagain = 1; 1878 else 1879 doagain = 0; 1880 srp = rp = fdfindsync(crp, erp); 1881 } 1882 return(0); 1883 } 1884 1885 void 1886 mscachetoraw(sc) 1887 struct fd_softc *sc; 1888 { 1889 u_short *rp, *erp, crc; 1890 u_char *cp, tb[5]; 1891 int sec, i; 1892 1893 rp = (u_short *)fdc_dmap; 1894 erp = rp + sc->type->nwritew; 1895 cp = sc->cachep; 1896 1897 /* 1898 * initial track filler (828 * GAP1) 1899 */ 1900 for (i = 0; i < sc->type->gap; i++) { 1901 *rp++ = FDMFMGAP1; 1902 *rp++ = FDMFMGAP1; 1903 } 1904 1905 for (sec = 0; sec < sc->nsectors; sec++) { 1906 1907 /* 1908 * leading sector gap 1909 * (12 * GAP2) + (3 * SYNC) 1910 */ 1911 for (i = 0; i < 12; i++) 1912 *rp++ = FDMFMGAP2; 1913 *rp++ = FDMFMSYNC; 1914 *rp++ = FDMFMSYNC; 1915 *rp++ = FDMFMSYNC; 1916 1917 /* 1918 * sector information 1919 * (ID) + track + side + sector + sector size + CRC16 1920 */ 1921 *rp++ = FDMFMID; 1922 tb[0] = sc->cachetrk / FDNHEADS; 1923 tb[1] = sc->cachetrk % FDNHEADS; 1924 tb[2] = sec + 1; 1925 i = sc->bytespersec; 1926 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1927 rp = msblkencode(rp, tb, 4, &crc); 1928 tb[0] = crc >> 8; 1929 tb[1] = crc & 0xff; 1930 tb[2] = 0x4e; /* GAP1 decoded */ 1931 rp = msblkencode(rp, tb, 3, 0); 1932 1933 /* 1934 * sector info/data gap 1935 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1936 */ 1937 for (i = 0; i < 21; i++) 1938 *rp++ = FDMFMGAP1; 1939 for (i = 0; i < 12; i++) 1940 *rp++ = FDMFMGAP2; 1941 *rp++ = FDMFMSYNC; 1942 *rp++ = FDMFMSYNC; 1943 *rp++ = FDMFMSYNC; 1944 1945 /* 1946 * sector data 1947 * (DATA) + ...data... + CRC16 1948 */ 1949 *rp++ = FDMFMDATA; 1950 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1951 cp += sc->bytespersec; 1952 tb[0] = crc >> 8; 1953 tb[1] = crc & 0xff; 1954 tb[2] = 0x4e; /* GAP3 decoded */ 1955 rp = msblkencode(rp, tb, 3, 0); 1956 1957 /* 1958 * trailing sector gap 1959 * (80 * GAP3) 1960 */ 1961 for (i = 0; i < 79; i++) 1962 *rp++ = FDMFMGAP3; 1963 } 1964 1965 /* 1966 * fill rest of track with GAP3 1967 */ 1968 while (rp != erp) 1969 *rp++ = FDMFMGAP3; 1970 1971 } 1972 1973 int 1974 msrawtocache(sc) 1975 struct fd_softc *sc; 1976 { 1977 u_short *rp, *srp, *erp; 1978 u_char tb[5], *cp; 1979 int ct, sec, retry; 1980 1981 srp = rp = (u_short *)fdc_dmap; 1982 erp = rp + sc->type->nreadw; 1983 cp = sc->cachep; 1984 1985 for (ct = 0; ct < sc->nsectors; ct++) { 1986 retry = 1; 1987 do { 1988 /* 1989 * skip leading gap to sync 1990 */ 1991 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 1992 #ifdef DIAGNOSTIC 1993 printf("%s: corrupted track (%d) data.\n", 1994 sc->sc_dv.dv_xname, sc->cachetrk); 1995 #endif 1996 return(-1); 1997 } 1998 1999 /* 2000 * Grab sector info 2001 */ 2002 if (*rp++ != FDMFMID) 2003 continue; 2004 rp = msblkdecode(rp, tb, 4); 2005 #ifdef FDDEBUG 2006 printf("sector id: sector %d, track %d, side %d," 2007 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 2008 #endif 2009 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 2010 tb[2] > sc->nsectors) 2011 continue; 2012 2013 sec = tb[2]; 2014 sc->bytespersec = 128 << tb[3]; 2015 rp += 2; /* skip CRC-16 */ 2016 2017 /* 2018 * skip gap and read in data 2019 */ 2020 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 2021 return(-1); 2022 if (*rp++ != FDMFMDATA) 2023 continue; 2024 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 2025 sc->bytespersec); 2026 rp += 2; /* skip CRC-16 */ 2027 2028 retry = 0; 2029 } while (retry); 2030 } 2031 return(0); 2032 } 2033 2034 /* 2035 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2036 * this format specified that the odd bits are at current pos and even 2037 * bits at len + current pos 2038 */ 2039 u_long * 2040 mfmblkencode(dp, rp, cp, len) 2041 u_long *dp, *rp, *cp; 2042 int len; 2043 { 2044 u_long *sdp, *edp, d, dtmp, correct; 2045 2046 sdp = dp; 2047 edp = dp + len; 2048 2049 if (*(rp - 1) & 0x1) 2050 correct = 1; 2051 else 2052 correct = 0; 2053 /* 2054 * do odd bits 2055 */ 2056 while (dp < edp) { 2057 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2058 dtmp = d ^ 0x55555555; 2059 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2060 /* 2061 * correct upper clock bit if needed 2062 */ 2063 if (correct) 2064 d &= 0x7fffffff; 2065 if (d & 0x1) 2066 correct = 1; 2067 else 2068 correct = 0; 2069 /* 2070 * do checksums and store in raw buffer 2071 */ 2072 if (cp) 2073 *cp ^= d; 2074 *rp++ = d; 2075 dp++; 2076 } 2077 /* 2078 * do even bits 2079 */ 2080 dp = sdp; 2081 while (dp < edp) { 2082 d = *dp & 0x55555555; /* remove clock bits */ 2083 dtmp = d ^ 0x55555555; 2084 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2085 /* 2086 * correct upper clock bit if needed 2087 */ 2088 if (correct) 2089 d &= 0x7fffffff; 2090 if (d & 0x1) 2091 correct = 1; 2092 else 2093 correct = 0; 2094 /* 2095 * do checksums and store in raw buffer 2096 */ 2097 if (cp) 2098 *cp ^= d; 2099 *rp++ = d; 2100 dp++; 2101 } 2102 if (cp) 2103 *cp &= 0x55555555; 2104 return(rp); 2105 } 2106 2107 /* 2108 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2109 * this format specified that the odd bits are at current pos and even 2110 * bits at len + current pos 2111 */ 2112 u_long * 2113 mfmblkdecode(rp, dp, cp, len) 2114 u_long *rp, *dp, *cp; 2115 int len; 2116 { 2117 u_long o, e; 2118 int cnt; 2119 2120 cnt = len; 2121 while (cnt--) { 2122 o = *rp; 2123 e = *(rp + len); 2124 if (cp) { 2125 *cp ^= o; 2126 *cp ^= e; 2127 } 2128 o &= 0x55555555; 2129 e &= 0x55555555; 2130 *dp++ = (o << 1) | e; 2131 rp++; 2132 } 2133 if (cp) 2134 *cp &= 0x55555555; 2135 return(rp + len); 2136 } 2137 2138 /* 2139 * decode len words in standard MFM format to len bytes 2140 * of data. 2141 */ 2142 u_short * 2143 msblkdecode(rp, cp, len) 2144 u_short *rp; 2145 u_char *cp; 2146 int len; 2147 { 2148 while (len--) { 2149 *cp++ = msdecode[*rp & 0x7f] | 2150 (msdecode[(*rp >> 8) & 0x7f] << 4); 2151 rp++; 2152 } 2153 2154 return(rp); 2155 } 2156 2157 /* 2158 * encode len bytes of data into len words in standard MFM format. 2159 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2160 * as well. 2161 */ 2162 u_short * 2163 msblkencode(rp, cp, len, crc) 2164 u_short *rp; 2165 u_char *cp; 2166 int len; 2167 u_short *crc; 2168 { 2169 u_short td; 2170 u_short mycrc; 2171 2172 /* preload crc for header (4 bytes) 2173 * or data (anything else) 2174 */ 2175 mycrc = (len == 4) ? 0xb230 : 0xe295; 2176 2177 while (len--) { 2178 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2179 2180 /* Check for zeros in top bit of encode and bottom 2181 * bit of previous encode. if so, slap a one in betweem 2182 * them. 2183 */ 2184 if ((td & 0x140) == 0) 2185 td |= 0x80; 2186 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2187 td |= 0x8000; 2188 2189 *rp++ = td; 2190 2191 /* 2192 * calc crc if requested 2193 */ 2194 if (crc) 2195 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2196 2197 cp++; 2198 } 2199 2200 if (crc) 2201 *crc = mycrc; 2202 2203 return(rp); 2204 } 2205 2206 int 2207 fddump(dev, blkno, va, size) 2208 dev_t dev; 2209 daddr_t blkno; 2210 caddr_t va; 2211 size_t size; 2212 { 2213 return (EINVAL); 2214 } 2215
Indexes created Mon Sep 29 21:09:56 GMT 2025