fd.c revision 1.43
1 /* $NetBSD: fd.c,v 1.43 2000/02/07 20:16:48 thorpej 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 #include "locators.h" 56 57 enum fdc_bits { FDB_CHANGED = 2, FDB_PROTECT, FDB_CYLZERO, FDB_READY }; 58 /* 59 * partitions in fd represent different format floppies 60 * partition a is 0 etc.. 61 */ 62 enum fd_parttypes { 63 FDAMIGAPART = 0, 64 FDMSDOSPART, 65 FDMAXPARTS 66 }; 67 68 #define FDBBSIZE (8192) 69 #define FDSBSIZE (8192) 70 71 #define FDUNIT(dev) DISKUNIT(dev) 72 #define FDPART(dev) DISKPART(dev) 73 #define FDMAKEDEV(m, u, p) MAKEDISKDEV((m), (u), (p)) 74 75 /* that's nice, but we don't want to always use this as an amiga drive 76 bunghole :-) */ 77 #define FDNHEADS (2) /* amiga drives always have 2 heads */ 78 #define FDSECSIZE (512) /* amiga drives always have 512 byte sectors */ 79 #define FDSECLWORDS (128) 80 81 #define FDSETTLEDELAY (18000) /* usec delay after seeking after switch dir */ 82 #define FDSTEPDELAY (3500) /* usec delay after steping */ 83 #define FDPRESIDEDELAY (1000) /* usec delay before writing can occur */ 84 #define FDWRITEDELAY (1300) /* usec delay after write */ 85 86 #define FDSTEPOUT (1) /* decrease track step */ 87 #define FDSTEPIN (0) /* increase track step */ 88 89 #define FDCUNITMASK (0x78) /* mask for all units (bits 6-3) */ 90 91 #define FDRETRIES (2) /* default number of retries */ 92 #define FDMAXUNITS (4) /* maximum number of supported units */ 93 94 #define DISKLEN_READ (0) /* fake mask for reading */ 95 #define DISKLEN_WRITE (1 << 14) /* bit for writing */ 96 #define DISKLEN_DMAEN (1 << 15) /* dma go */ 97 #define DMABUFSZ ((DISKLEN_WRITE - 1) * 2) /* largest dma possible */ 98 99 #define FDMFMSYNC (0x4489) 100 #define FDMFMID (0x5554) 101 #define FDMFMDATA (0x5545) 102 #define FDMFMGAP1 (0x9254) 103 #define FDMFMGAP2 (0xAAAA) 104 #define FDMFMGAP3 (0x9254) 105 #define CRC16POLY (0x1021) /* (x^16) + x^12 + x^5 + x^0 */ 106 107 /* 108 * Msdos-type MFM encode/decode 109 */ 110 static u_char msdecode[128]; 111 static u_char msencode[16] = 112 { 113 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 114 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 115 }; 116 static u_short mscrctab[256]; 117 118 /* 119 5554 aaaa aaaa aaa5 2aa4 4452 aa51 120 00 00 03 02 ac 0d 121 */ 122 123 /* 124 * floppy device type 125 */ 126 struct fdtype { 127 u_int driveid; /* drive identification (from drive) */ 128 u_int ncylinders; /* number of cylinders on drive */ 129 u_int amiga_nsectors; /* number of sectors per amiga track */ 130 u_int msdos_nsectors; /* number of sectors per msdos track */ 131 u_int nreadw; /* number of words (short) read per track */ 132 u_int nwritew; /* number of words (short) written per track */ 133 u_int gap; /* track gap size in long words */ 134 u_int precomp[2]; /* 1st and 2nd precomp values */ 135 char *desc; /* description of drive type (useq) */ 136 }; 137 138 /* 139 * floppy disk device data 140 */ 141 struct fd_softc { 142 struct device sc_dv; /* generic device info; must come first */ 143 struct disk dkdev; /* generic disk info */ 144 struct buf_queue bufq; /* queue pending I/O operations */ 145 struct buf curbuf; /* state of current I/O operation */ 146 struct fdtype *type; 147 void *cachep; /* cached track data (write through) */ 148 int cachetrk; /* cahced track -1 for none */ 149 int hwunit; /* unit for amiga controlling hw */ 150 int unitmask; /* mask for cia select deslect */ 151 int pstepdir; /* previous step direction */ 152 int curcyl; /* current curcyl head positioned on */ 153 int flags; /* misc flags */ 154 int wlabel; 155 int stepdelay; /* useq to delay after seek user setable */ 156 int nsectors; /* number of sectors per track */ 157 int openpart; /* which partition [ab] == [12] is open */ 158 short retries; /* number of times to retry failed io */ 159 short retried; /* number of times current io retried */ 160 int bytespersec; /* number of bytes per sector */ 161 }; 162 163 /* fd_softc->flags */ 164 #define FDF_MOTORON (0x01) /* motor is running */ 165 #define FDF_MOTOROFF (0x02) /* motor is waiting to be turned off */ 166 #define FDF_WMOTOROFF (0x04) /* unit wants a wakeup after off */ 167 #define FDF_DIRTY (0x08) /* track cache needs write */ 168 #define FDF_WRITEWAIT (0x10) /* need to head select delay on next setpos */ 169 #define FDF_HAVELABEL (0x20) /* label is valid */ 170 #define FDF_JUSTFLUSH (0x40) /* don't bother caching track. */ 171 #define FDF_NOTRACK0 (0x80) /* was not able to recalibrate drive */ 172 173 int fdc_wantwakeup; 174 int fdc_side; 175 void *fdc_dmap; 176 struct fd_softc *fdc_indma; 177 int fdc_dmalen; 178 int fdc_dmawrite; 179 180 struct fdcargs { 181 struct fdtype *type; 182 int unit; 183 }; 184 185 int fdcmatch __P((struct device *, struct cfdata *, void *)); 186 void fdcattach __P((struct device *, struct device *, void *)); 187 int fdcprint __P((void *, const char *)); 188 int fdmatch __P((struct device *, struct cfdata *, void *)); 189 void fdattach __P((struct device *, struct device *, void *)); 190 191 void fdintr __P((int)); 192 void fdidxintr __P((void)); 193 void fdstrategy __P((struct buf *)); 194 int fdloaddisk __P((struct fd_softc *)); 195 void fdgetdefaultlabel __P((struct fd_softc *, struct disklabel *, int)); 196 int fdgetdisklabel __P((struct fd_softc *, dev_t)); 197 int fdsetdisklabel __P((struct fd_softc *, struct disklabel *)); 198 int fdputdisklabel __P((struct fd_softc *, dev_t)); 199 struct fdtype * fdcgetfdtype __P((int)); 200 void fdmotoroff __P((void *)); 201 void fdsetpos __P((struct fd_softc *, int, int)); 202 void fdselunit __P((struct fd_softc *)); 203 void fdstart __P((struct fd_softc *)); 204 void fdcont __P((struct fd_softc *)); 205 void fddmastart __P((struct fd_softc *, int)); 206 void fdcalibrate __P((void *)); 207 void fddmadone __P((struct fd_softc *, int)); 208 void fddone __P((struct fd_softc *)); 209 void fdfindwork __P((int)); 210 void fdminphys __P((struct buf *)); 211 void fdcachetoraw __P((struct fd_softc *)); 212 void amcachetoraw __P((struct fd_softc *)); 213 int amrawtocache __P((struct fd_softc *)); 214 u_long *fdfindsync __P((u_long *, u_long *)); 215 int fdrawtocache __P((struct fd_softc *)); 216 void mscachetoraw __P((struct fd_softc *)); 217 int msrawtocache __P((struct fd_softc *)); 218 u_long *mfmblkencode __P((u_long *, u_long *, u_long *, int)); 219 u_long *mfmblkdecode __P((u_long *, u_long *, u_long *, int)); 220 u_short *msblkdecode __P((u_short *, u_char *, int)); 221 u_short *msblkencode __P((u_short *, u_char *, int, u_short *)); 222 223 struct dkdriver fddkdriver = { fdstrategy }; 224 225 /* 226 * read size is (nsectors + 1) * mfm secsize + gap bytes + 2 shorts 227 * write size is nsectors * mfm secsize + gap bytes + 3 shorts 228 * the extra shorts are to deal with a dma hw bug in the controller 229 * they are probably too much (I belive the bug is 1 short on write and 230 * 3 bits on read) but there is no need to be cheap here. 231 */ 232 #define MAXTRKSZ (22 * FDSECSIZE) 233 struct fdtype fdtype[] = { 234 { 0x00000000, 80, 11, 9, 7358, 6815, 414, { 80, 161 }, "3.5dd" }, 235 { 0x55555555, 40, 11, 9, 7358, 6815, 414, { 80, 161 }, "5.25dd" }, 236 { 0xAAAAAAAA, 80, 22, 18, 14716, 13630, 828, { 80, 161 }, "3.5hd" } 237 }; 238 int nfdtype = sizeof(fdtype) / sizeof(*fdtype); 239 240 struct cfattach fd_ca = { 241 sizeof(struct fd_softc), fdmatch, fdattach 242 }; 243 244 extern struct cfdriver fd_cd; 245 246 struct cfattach fdc_ca = { 247 sizeof(struct device), fdcmatch, fdcattach 248 }; 249 250 /* 251 * all hw access through macros, this helps to hide the active low 252 * properties 253 */ 254 255 #define FDUNITMASK(unit) (1 << (3 + (unit))) 256 257 /* 258 * select units using mask 259 */ 260 #define FDSELECT(um) do { ciab.prb &= ~(um); } while (0) 261 262 /* 263 * deselect units using mask 264 */ 265 #define FDDESELECT(um) do { ciab.prb |= (um); delay(1); } while (0) 266 267 /* 268 * test hw condition bits 269 */ 270 #define FDTESTC(bit) ((ciaa.pra & (1 << (bit))) == 0) 271 272 /* 273 * set motor for select units, true motor on else off 274 */ 275 #define FDSETMOTOR(on) do { \ 276 if (on) ciab.prb &= ~CIAB_PRB_MTR; else ciab.prb |= CIAB_PRB_MTR; \ 277 } while (0) 278 279 /* 280 * set head for select units 281 */ 282 #define FDSETHEAD(head) do { \ 283 if (head) ciab.prb &= ~CIAB_PRB_SIDE; else ciab.prb |= CIAB_PRB_SIDE; \ 284 delay(1); } while (0) 285 286 /* 287 * select direction, true towards spindle else outwards 288 */ 289 #define FDSETDIR(in) do { \ 290 if (in) ciab.prb &= ~CIAB_PRB_DIR; else ciab.prb |= CIAB_PRB_DIR; \ 291 delay(1); } while (0) 292 293 /* 294 * step the selected units 295 */ 296 #define FDSTEP do { \ 297 ciab.prb &= ~CIAB_PRB_STEP; ciab.prb |= CIAB_PRB_STEP; \ 298 } while (0) 299 300 #define FDDMASTART(len, towrite) do { \ 301 int dmasz = (len) | ((towrite) ? DISKLEN_WRITE : 0) | DISKLEN_DMAEN; \ 302 custom.dsklen = dmasz; custom.dsklen = dmasz; } while (0) 303 304 #define FDDMASTOP do { custom.dsklen = 0; } while (0) 305 306 307 int 308 fdcmatch(pdp, cfp, auxp) 309 struct device *pdp; 310 struct cfdata *cfp; 311 void *auxp; 312 { 313 314 if (matchname("fdc", auxp) == 0 || cfp->cf_unit != 0) 315 return(0); 316 if ((fdc_dmap = alloc_chipmem(DMABUFSZ)) == NULL) { 317 printf("fdc: unable to allocate dma buffer\n"); 318 return(0); 319 } 320 return(1); 321 } 322 323 void 324 fdcattach(pdp, dp, auxp) 325 struct device *pdp, *dp; 326 void *auxp; 327 { 328 struct fdcargs args; 329 330 printf(": dmabuf pa 0x%x", kvtop(fdc_dmap)); 331 printf(": dmabuf ka %p\n", fdc_dmap); 332 args.unit = 0; 333 args.type = fdcgetfdtype(args.unit); 334 335 fdc_side = -1; 336 config_found(dp, &args, fdcprint); 337 for (args.unit++; args.unit < FDMAXUNITS; args.unit++) { 338 if ((args.type = fdcgetfdtype(args.unit)) == NULL) 339 continue; 340 config_found(dp, &args, fdcprint); 341 } 342 } 343 344 int 345 fdcprint(auxp, pnp) 346 void *auxp; 347 const char *pnp; 348 { 349 struct fdcargs *fcp; 350 351 fcp = auxp; 352 if (pnp) 353 printf("fd%d at %s unit %d:", fcp->unit, pnp, 354 fcp->type->driveid); 355 return(UNCONF); 356 } 357 358 /*ARGSUSED*/ 359 int 360 fdmatch(pdp, cfp, auxp) 361 struct device *pdp; 362 struct cfdata *cfp; 363 void *auxp; 364 { 365 366 #define cf_unit cf_loc[FDCCF_UNIT] 367 struct fdcargs *fdap; 368 369 fdap = auxp; 370 if (cfp->cf_unit == fdap->unit || cfp->cf_unit == FDCCF_UNIT_DEFAULT) 371 return(1); 372 return(0); 373 #undef cf_unit 374 } 375 376 void 377 fdattach(pdp, dp, auxp) 378 struct device *pdp, *dp; 379 void *auxp; 380 { 381 struct fdcargs *ap; 382 struct fd_softc *sc; 383 int i; 384 385 ap = auxp; 386 sc = (struct fd_softc *)dp; 387 388 BUFQ_INIT(&sc->bufq); 389 390 sc->curcyl = sc->cachetrk = -1; 391 sc->openpart = -1; 392 sc->type = ap->type; 393 sc->hwunit = ap->unit; 394 sc->unitmask = 1 << (3 + ap->unit); 395 sc->retries = FDRETRIES; 396 sc->stepdelay = FDSTEPDELAY; 397 sc->bytespersec = 512; 398 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 399 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 400 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 401 402 /* 403 * Initialize and attach the disk structure. 404 */ 405 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 406 sc->dkdev.dk_driver = &fddkdriver; 407 disk_attach(&sc->dkdev); 408 409 /* 410 * calibrate the drive 411 */ 412 fdsetpos(sc, 0, 0); 413 fdsetpos(sc, sc->type->ncylinders, 0); 414 fdsetpos(sc, 0, 0); 415 fdmotoroff(sc); 416 417 /* 418 * precalc msdos MFM and CRC 419 */ 420 for (i = 0; i < 128; i++) 421 msdecode[i] = 0xff; 422 for (i = 0; i < 16; i++) 423 msdecode[msencode[i]] = i; 424 for (i = 0; i < 256; i++) { 425 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 426 (0x1021 * (i >> 4)); 427 } 428 429 /* 430 * enable disk related interrupts 431 */ 432 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 433 custom.intena = INTF_SETCLR | INTF_DSKBLK; 434 ciab.icr = CIA_ICR_FLG; 435 } 436 437 /*ARGSUSED*/ 438 int 439 fdopen(dev, flags, devtype, p) 440 dev_t dev; 441 int flags, devtype; 442 struct proc *p; 443 { 444 struct fd_softc *sc; 445 int wasopen, fwork, error, s; 446 447 error = 0; 448 449 if (FDPART(dev) >= FDMAXPARTS) 450 return(ENXIO); 451 452 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 453 return(ENXIO); 454 if (sc->flags & FDF_NOTRACK0) 455 return(ENXIO); 456 if (sc->cachep == NULL) 457 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 458 459 s = splbio(); 460 /* 461 * if we are sleeping in fdclose(); waiting for a chance to 462 * shut the motor off, do a sleep here also. 463 */ 464 while (sc->flags & FDF_WMOTOROFF) 465 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 466 467 fwork = 0; 468 /* 469 * if not open let user open request type, otherwise 470 * ensure they are trying to open same type. 471 */ 472 if (sc->openpart == FDPART(dev)) 473 wasopen = 1; 474 else if (sc->openpart == -1) { 475 sc->openpart = FDPART(dev); 476 wasopen = 0; 477 } else { 478 wasopen = 1; 479 error = EPERM; 480 goto done; 481 } 482 483 /* 484 * wait for current io to complete if any 485 */ 486 if (fdc_indma) { 487 fwork = 1; 488 fdc_wantwakeup++; 489 tsleep(fdopen, PRIBIO, "fdopen", 0); 490 } 491 if ((error = fdloaddisk(sc)) != 0) 492 goto done; 493 if ((error = fdgetdisklabel(sc, dev)) != 0) 494 goto done; 495 #ifdef FDDEBUG 496 printf(" open successful\n"); 497 #endif 498 done: 499 /* 500 * if we requested that fddone()->fdfindwork() wake us, allow it to 501 * complete its job now 502 */ 503 if (fwork) 504 fdfindwork(FDUNIT(dev)); 505 splx(s); 506 507 /* 508 * if we were not open and we marked us so reverse that. 509 */ 510 if (error && wasopen == 0) 511 sc->openpart = -1; 512 return(error); 513 } 514 515 /*ARGSUSED*/ 516 int 517 fdclose(dev, flags, devtype, p) 518 dev_t dev; 519 int flags, devtype; 520 struct proc *p; 521 { 522 struct fd_softc *sc; 523 int s; 524 525 #ifdef FDDEBUG 526 printf("fdclose()\n"); 527 #endif 528 sc = getsoftc(fd_cd, FDUNIT(dev)); 529 s = splbio(); 530 if (sc->flags & FDF_MOTORON) { 531 sc->flags |= FDF_WMOTOROFF; 532 tsleep(fdmotoroff, PRIBIO, "fdclose", 0); 533 sc->flags &= ~FDF_WMOTOROFF; 534 wakeup(fdmotoroff); 535 } 536 sc->openpart = -1; 537 splx(s); 538 return(0); 539 } 540 541 int 542 fdioctl(dev, cmd, addr, flag, p) 543 dev_t dev; 544 u_long cmd; 545 caddr_t addr; 546 int flag; 547 struct proc *p; 548 { 549 struct fd_softc *sc; 550 int error, wlab; 551 552 sc = getsoftc(fd_cd, FDUNIT(dev)); 553 554 if ((sc->flags & FDF_HAVELABEL) == 0) 555 return(EBADF); 556 557 switch (cmd) { 558 case DIOCSBAD: 559 return(EINVAL); 560 case DIOCSRETRIES: 561 if (*(int *)addr < 0) 562 return(EINVAL); 563 sc->retries = *(int *)addr; 564 return(0); 565 case DIOCSSTEP: 566 if (*(int *)addr < FDSTEPDELAY) 567 return(EINVAL); 568 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 569 return(0); 570 case DIOCGDINFO: 571 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 572 return(0); 573 case DIOCGPART: 574 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 575 ((struct partinfo *)addr)->part = 576 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 577 return(0); 578 case DIOCSDINFO: 579 if ((flag & FWRITE) == 0) 580 return(EBADF); 581 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 582 case DIOCWDINFO: 583 if ((flag & FWRITE) == 0) 584 return(EBADF); 585 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 586 return(error); 587 wlab = sc->wlabel; 588 sc->wlabel = 1; 589 error = fdputdisklabel(sc, dev); 590 sc->wlabel = wlab; 591 return(error); 592 case DIOCWLABEL: 593 if ((flag & FWRITE) == 0) 594 return(EBADF); 595 sc->wlabel = *(int *)addr; 596 return(0); 597 case DIOCGDEFLABEL: 598 fdgetdefaultlabel(sc, (struct disklabel *)addr, FDPART(dev)); 599 return(0); 600 default: 601 return(ENOTTY); 602 } 603 } 604 605 /* 606 * no dumps to floppy disks thank you. 607 */ 608 int 609 fdsize(dev) 610 dev_t dev; 611 { 612 return(-1); 613 } 614 615 int 616 fdread(dev, uio, flags) 617 dev_t dev; 618 struct uio *uio; 619 int flags; 620 { 621 return (physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 622 } 623 624 int 625 fdwrite(dev, uio, flags) 626 dev_t dev; 627 struct uio *uio; 628 int flags; 629 { 630 return (physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 631 } 632 633 634 void 635 fdintr(flag) 636 int flag; 637 { 638 int s; 639 640 s = splbio(); 641 if (fdc_indma) 642 fddmadone(fdc_indma, 0); 643 splx(s); 644 } 645 646 void 647 fdidxintr() 648 { 649 if (fdc_indma && fdc_dmalen) { 650 /* 651 * turn off intr and start actual dma 652 */ 653 ciab.icr = CIA_ICR_FLG; 654 FDDMASTART(fdc_dmalen, fdc_dmawrite); 655 fdc_dmalen = 0; 656 } 657 } 658 659 void 660 fdstrategy(bp) 661 struct buf *bp; 662 { 663 struct disklabel *lp; 664 struct fd_softc *sc; 665 int unit, part, s; 666 667 unit = FDUNIT(bp->b_dev); 668 part = FDPART(bp->b_dev); 669 sc = getsoftc(fd_cd, unit); 670 671 #ifdef FDDEBUG 672 printf("fdstrategy: 0x%x\n", bp); 673 #endif 674 /* 675 * check for valid partition and bounds 676 */ 677 lp = sc->dkdev.dk_label; 678 if ((sc->flags & FDF_HAVELABEL) == 0) { 679 bp->b_error = EIO; 680 goto bad; 681 } 682 if (bounds_check_with_label(bp, lp, sc->wlabel) <= 0) 683 goto done; 684 685 /* 686 * trans count of zero or bounds check indicates io is done 687 * we are done. 688 */ 689 if (bp->b_bcount == 0) 690 goto done; 691 692 bp->b_rawblkno = bp->b_blkno; 693 694 /* 695 * queue the buf and kick the low level code 696 */ 697 s = splbio(); 698 disksort_cylinder(&sc->bufq, bp); 699 fdstart(sc); 700 splx(s); 701 return; 702 bad: 703 bp->b_flags |= B_ERROR; 704 done: 705 bp->b_resid = bp->b_bcount; 706 biodone(bp); 707 } 708 709 /* 710 * make sure disk is loaded and label is up-to-date. 711 */ 712 int 713 fdloaddisk(sc) 714 struct fd_softc *sc; 715 { 716 /* 717 * if diskchange is low step drive to 0 then up one then to zero. 718 */ 719 fdselunit(sc); /* make sure the unit is selected */ 720 if (FDTESTC(FDB_CHANGED)) { 721 fdsetpos(sc, 0, 0); 722 sc->cachetrk = -1; /* invalidate the cache */ 723 sc->flags &= ~FDF_HAVELABEL; 724 fdsetpos(sc, FDNHEADS, 0); 725 fdsetpos(sc, 0, 0); 726 if (FDTESTC(FDB_CHANGED)) { 727 fdmotoroff(sc); 728 FDDESELECT(sc->unitmask); 729 return(ENXIO); 730 } 731 } 732 FDDESELECT(sc->unitmask); 733 fdmotoroff(sc); 734 sc->type = fdcgetfdtype(sc->hwunit); 735 if (sc->type == NULL) 736 return(ENXIO); 737 if (sc->openpart == FDMSDOSPART) 738 sc->nsectors = sc->type->msdos_nsectors; 739 else 740 sc->nsectors = sc->type->amiga_nsectors; 741 return(0); 742 } 743 744 void 745 fdgetdefaultlabel(sc, lp, part) 746 struct fd_softc *sc; 747 struct disklabel *lp; 748 int part; /* XXX ick */ 749 { 750 751 bzero(lp, sizeof(struct disklabel)); 752 lp->d_secsize = FDSECSIZE; 753 lp->d_ntracks = FDNHEADS; 754 lp->d_ncylinders = sc->type->ncylinders; 755 lp->d_nsectors = sc->nsectors; 756 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 757 lp->d_type = DTYPE_FLOPPY; 758 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 759 lp->d_rpm = 300; /* good guess I suppose. */ 760 lp->d_interleave = 1; /* should change when adding msdos */ 761 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 762 lp->d_bbsize = 0; 763 lp->d_sbsize = 0; 764 lp->d_partitions[part].p_size = lp->d_secperunit; 765 lp->d_partitions[part].p_fstype = FS_UNUSED; 766 lp->d_partitions[part].p_fsize = 1024; 767 lp->d_partitions[part].p_frag = 8; 768 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 769 lp->d_npartitions = part + 1; 770 lp->d_magic = lp->d_magic2 = DISKMAGIC; 771 lp->d_checksum = dkcksum(lp); 772 } 773 774 /* 775 * read disk label, if present otherwise create one 776 * return a new label if raw part and none found, otherwise err. 777 */ 778 int 779 fdgetdisklabel(sc, dev) 780 struct fd_softc *sc; 781 dev_t dev; 782 { 783 struct disklabel *lp, *dlp; 784 struct cpu_disklabel *clp; 785 struct buf *bp; 786 int error, part; 787 788 if (sc->flags & FDF_HAVELABEL && 789 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 790 return(0); 791 #ifdef FDDEBUG 792 printf("fdgetdisklabel()\n"); 793 #endif 794 part = FDPART(dev); 795 lp = sc->dkdev.dk_label; 796 clp = sc->dkdev.dk_cpulabel; 797 bzero(lp, sizeof(struct disklabel)); 798 bzero(clp, sizeof(struct cpu_disklabel)); 799 800 lp->d_secsize = FDSECSIZE; 801 lp->d_ntracks = FDNHEADS; 802 lp->d_ncylinders = sc->type->ncylinders; 803 lp->d_nsectors = sc->nsectors; 804 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 805 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 806 lp->d_npartitions = part + 1; 807 lp->d_partitions[part].p_size = lp->d_secperunit; 808 lp->d_partitions[part].p_fstype = FS_UNUSED; 809 lp->d_partitions[part].p_fsize = 1024; 810 lp->d_partitions[part].p_frag = 8; 811 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 812 813 sc->flags |= FDF_HAVELABEL; 814 815 bp = (void *)geteblk((int)lp->d_secsize); 816 bp->b_dev = dev; 817 bp->b_blkno = 0; 818 bp->b_cylinder = 0; 819 bp->b_bcount = FDSECSIZE; 820 bp->b_flags = B_BUSY | B_READ; 821 fdstrategy(bp); 822 if ((error = biowait(bp)) != 0) 823 goto nolabel; 824 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 825 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 826 dkcksum(dlp)) { 827 error = EINVAL; 828 goto nolabel; 829 } 830 bcopy(dlp, lp, sizeof(struct disklabel)); 831 if (lp->d_trkseek > FDSTEPDELAY) 832 sc->stepdelay = lp->d_trkseek; 833 brelse(bp); 834 return(0); 835 nolabel: 836 fdgetdefaultlabel(sc, lp, part); 837 brelse(bp); 838 return(0); 839 } 840 841 /* 842 * set the incore copy of this units disklabel 843 */ 844 int 845 fdsetdisklabel(sc, lp) 846 struct fd_softc *sc; 847 struct disklabel *lp; 848 { 849 struct disklabel *clp; 850 struct partition *pp; 851 852 /* 853 * must have at least opened raw unit to fetch the 854 * raw_part stuff. 855 */ 856 if ((sc->flags & FDF_HAVELABEL) == 0) 857 return(EINVAL); 858 clp = sc->dkdev.dk_label; 859 /* 860 * make sure things check out and we only have one valid 861 * partition 862 */ 863 #ifdef FDDEBUG 864 printf("fdsetdisklabel\n"); 865 #endif 866 if (lp->d_secsize != FDSECSIZE || 867 lp->d_nsectors != clp->d_nsectors || 868 lp->d_ntracks != FDNHEADS || 869 lp->d_ncylinders != clp->d_ncylinders || 870 lp->d_secpercyl != clp->d_secpercyl || 871 lp->d_secperunit != clp->d_secperunit || 872 lp->d_magic != DISKMAGIC || 873 lp->d_magic2 != DISKMAGIC || 874 lp->d_npartitions == 0 || 875 lp->d_npartitions > FDMAXPARTS || 876 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 877 dkcksum(lp)) 878 return(EINVAL); 879 /* 880 * if any partitions are present make sure they 881 * represent the currently open type 882 */ 883 if ((pp = &lp->d_partitions[0])->p_size) { 884 if ((pp = &lp->d_partitions[1])->p_size == 0) 885 goto done; 886 else if (sc->openpart != 1) 887 return(EINVAL); 888 } else if (sc->openpart != 0) 889 return(EINVAL); 890 /* 891 * make sure selected partition is within bounds 892 * XXX on the second check, its to handle a bug in 893 * XXX the cluster routines as they require mutliples 894 * XXX of NBPG currently 895 */ 896 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 897 (pp->p_frag * pp->p_fsize % NBPG)) 898 return(EINVAL); 899 done: 900 bcopy(lp, clp, sizeof(struct disklabel)); 901 return(0); 902 } 903 904 /* 905 * write out the incore copy of this units disklabel 906 */ 907 int 908 fdputdisklabel(sc, dev) 909 struct fd_softc *sc; 910 dev_t dev; 911 { 912 struct disklabel *lp, *dlp; 913 struct buf *bp; 914 int error; 915 916 if ((sc->flags & FDF_HAVELABEL) == 0) 917 return(EBADF); 918 #ifdef FDDEBUG 919 printf("fdputdisklabel\n"); 920 #endif 921 /* 922 * get buf and read in sector 0 923 */ 924 lp = sc->dkdev.dk_label; 925 bp = (void *)geteblk((int)lp->d_secsize); 926 bp->b_dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 927 bp->b_blkno = 0; 928 bp->b_cylinder = 0; 929 bp->b_bcount = FDSECSIZE; 930 bp->b_flags = B_BUSY | B_READ; 931 fdstrategy(bp); 932 if ((error = biowait(bp)) != 0) 933 goto done; 934 /* 935 * copy disklabel to buf and write it out syncronous 936 */ 937 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 938 bcopy(lp, dlp, sizeof(struct disklabel)); 939 bp->b_blkno = 0; 940 bp->b_cylinder = 0; 941 bp->b_flags = B_WRITE; 942 fdstrategy(bp); 943 error = biowait(bp); 944 done: 945 brelse(bp); 946 return(error); 947 } 948 949 /* 950 * figure out drive type or NULL if none. 951 */ 952 struct fdtype * 953 fdcgetfdtype(unit) 954 int unit; 955 { 956 struct fdtype *ftp; 957 u_long id, idb; 958 int cnt, umask; 959 960 id = 0; 961 umask = 1 << (3 + unit); 962 963 FDDESELECT(FDCUNITMASK); 964 965 FDSETMOTOR(1); 966 delay(1); 967 FDSELECT(umask); 968 delay(1); 969 FDDESELECT(umask); 970 971 FDSETMOTOR(0); 972 delay(1); 973 FDSELECT(umask); 974 delay(1); 975 FDDESELECT(umask); 976 977 for (idb = 0x80000000; idb; idb >>= 1) { 978 FDSELECT(umask); 979 delay(1); 980 if (FDTESTC(FDB_READY) == 0) 981 id |= idb; 982 FDDESELECT(umask); 983 delay(1); 984 } 985 #ifdef FDDEBUG 986 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 987 #endif 988 989 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 990 if (ftp->driveid == id) 991 return(ftp); 992 /* 993 * 3.5dd's at unit 0 do not always return id. 994 */ 995 if (unit == 0) 996 return(fdtype); 997 return(NULL); 998 } 999 1000 /* 1001 * turn motor off if possible otherwise mark as needed and will be done 1002 * later. 1003 */ 1004 void 1005 fdmotoroff(arg) 1006 void *arg; 1007 { 1008 struct fd_softc *sc; 1009 int s; 1010 1011 sc = arg; 1012 s = splbio(); 1013 1014 #ifdef FDDEBUG 1015 printf("fdmotoroff: unit %d\n", sc->hwunit); 1016 #endif 1017 if ((sc->flags & FDF_MOTORON) == 0) 1018 goto done; 1019 /* 1020 * if we have a timeout on a dma operation let fddmadone() 1021 * deal with it. 1022 */ 1023 if (fdc_indma == sc) { 1024 fddmadone(sc, 1); 1025 goto done; 1026 } 1027 #ifdef FDDEBUG 1028 printf(" motor was on, turning off\n"); 1029 #endif 1030 1031 /* 1032 * flush cache if needed 1033 */ 1034 if (sc->flags & FDF_DIRTY) { 1035 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1036 #ifdef FDDEBUG 1037 printf(" flushing dirty buffer first\n"); 1038 #endif 1039 /* 1040 * if dma'ing done for now, fddone() will call us again 1041 */ 1042 if (fdc_indma) 1043 goto done; 1044 fddmastart(sc, sc->cachetrk); 1045 goto done; 1046 } 1047 1048 /* 1049 * if controller is busy just schedule us to be called back 1050 */ 1051 if (fdc_indma) { 1052 /* 1053 * someone else has the controller now 1054 * just set flag and let fddone() call us again. 1055 */ 1056 sc->flags |= FDF_MOTOROFF; 1057 goto done; 1058 } 1059 1060 #ifdef FDDEBUG 1061 printf(" hw turning unit off\n"); 1062 #endif 1063 1064 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1065 FDDESELECT(FDCUNITMASK); 1066 FDSETMOTOR(0); 1067 delay(1); 1068 FDSELECT(sc->unitmask); 1069 delay(4); 1070 FDDESELECT(sc->unitmask); 1071 delay(1); 1072 if (sc->flags & FDF_WMOTOROFF) 1073 wakeup(fdmotoroff); 1074 done: 1075 splx(s); 1076 } 1077 1078 /* 1079 * select drive seek to track exit with motor on. 1080 * fdsetpos(x, 0, 0) does calibrates the drive. 1081 */ 1082 void 1083 fdsetpos(sc, trk, towrite) 1084 struct fd_softc *sc; 1085 int trk, towrite; 1086 { 1087 int nstep, sdir, ondly, ncyl, nside; 1088 1089 FDDESELECT(FDCUNITMASK); 1090 FDSETMOTOR(1); 1091 delay(1); 1092 FDSELECT(sc->unitmask); 1093 delay(1); 1094 if ((sc->flags & FDF_MOTORON) == 0) { 1095 ondly = 0; 1096 while (FDTESTC(FDB_READY) == 0) { 1097 delay(1000); 1098 if (++ondly >= 1000) 1099 break; 1100 } 1101 } 1102 sc->flags |= FDF_MOTORON; 1103 1104 ncyl = trk / FDNHEADS; 1105 nside = trk % FDNHEADS; 1106 1107 if (sc->curcyl == ncyl && fdc_side == nside) 1108 return; 1109 1110 if (towrite) 1111 sc->flags |= FDF_WRITEWAIT; 1112 1113 #ifdef FDDEBUG 1114 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1115 trk % FDNHEADS, towrite); 1116 #endif 1117 nstep = ncyl - sc->curcyl; 1118 if (nstep) { 1119 /* 1120 * figure direction 1121 */ 1122 if (nstep > 0 && ncyl != 0) { 1123 sdir = FDSTEPIN; 1124 FDSETDIR(1); 1125 } else { 1126 nstep = -nstep; 1127 sdir = FDSTEPOUT; 1128 FDSETDIR(0); 1129 } 1130 if (ncyl == 0) { 1131 /* 1132 * either just want cylinder 0 or doing 1133 * a calibrate. 1134 */ 1135 nstep = 256; 1136 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1137 FDSTEP; 1138 delay(sc->stepdelay); 1139 } 1140 if (nstep < 0) 1141 sc->flags |= FDF_NOTRACK0; 1142 } else { 1143 /* 1144 * step the needed amount amount. 1145 */ 1146 while (nstep--) { 1147 FDSTEP; 1148 delay(sc->stepdelay); 1149 } 1150 } 1151 /* 1152 * if switched directions 1153 * allow drive to settle. 1154 */ 1155 if (sc->pstepdir != sdir) 1156 delay(FDSETTLEDELAY); 1157 sc->pstepdir = sdir; 1158 sc->curcyl = ncyl; 1159 } 1160 if (nside == fdc_side) 1161 return; 1162 /* 1163 * select side 1164 */ 1165 fdc_side = nside; 1166 FDSETHEAD(nside); 1167 delay(FDPRESIDEDELAY); 1168 } 1169 1170 void 1171 fdselunit(sc) 1172 struct fd_softc *sc; 1173 { 1174 FDDESELECT(FDCUNITMASK); /* deselect all */ 1175 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1176 delay(1); 1177 FDSELECT(sc->unitmask); /* select unit */ 1178 delay(1); 1179 } 1180 1181 /* 1182 * process next buf on device queue. 1183 * normall sequence of events: 1184 * fdstart() -> fddmastart(); 1185 * fdidxintr(); 1186 * fdintr() -> fddmadone() -> fddone(); 1187 * if the track is in the cache then fdstart() will short-circuit 1188 * to fddone() else if the track cache is dirty it will flush. If 1189 * the buf is not an entire track it will cache the requested track. 1190 */ 1191 void 1192 fdstart(sc) 1193 struct fd_softc *sc; 1194 { 1195 int trk, error, write; 1196 struct buf *bp, *dp; 1197 int changed; 1198 1199 #ifdef FDDEBUG 1200 printf("fdstart: unit %d\n", sc->hwunit); 1201 #endif 1202 1203 /* 1204 * if dma'ing just return. we must have been called from fdstartegy. 1205 */ 1206 if (fdc_indma) 1207 return; 1208 1209 /* 1210 * get next buf if there. 1211 */ 1212 dp = &sc->curbuf; 1213 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) { 1214 #ifdef FDDEBUG 1215 printf(" nothing to do\n"); 1216 #endif 1217 return; 1218 } 1219 1220 /* 1221 * Mark us as busy now, in case fddone() gets called in one 1222 * of the cases below. 1223 */ 1224 disk_busy(&sc->dkdev); 1225 1226 /* 1227 * make sure same disk is loaded 1228 */ 1229 fdselunit(sc); 1230 changed = FDTESTC(FDB_CHANGED); 1231 FDDESELECT(sc->unitmask); 1232 if (changed) { 1233 /* 1234 * disk missing, invalidate all future io on 1235 * this unit until re-open()'ed also invalidate 1236 * all current io 1237 */ 1238 printf("fdstart: disk changed\n"); 1239 #ifdef FDDEBUG 1240 printf(" disk was removed invalidating all io\n"); 1241 #endif 1242 sc->flags &= ~FDF_HAVELABEL; 1243 for (;;) { 1244 bp->b_flags |= B_ERROR; 1245 bp->b_error = EIO; 1246 if (BUFQ_NEXT(bp) == NULL) 1247 break; 1248 biodone(bp); 1249 bp = BUFQ_NEXT(bp); 1250 } 1251 /* 1252 * do fddone() on last buf to allow other units to start. 1253 */ 1254 BUFQ_INSERT_HEAD(&sc->bufq, bp); 1255 fddone(sc); 1256 return; 1257 } 1258 1259 /* 1260 * we have a valid buf, setup our local version 1261 * we use this count to allow reading over multiple tracks. 1262 * into a single buffer 1263 */ 1264 dp->b_bcount = bp->b_bcount; 1265 dp->b_blkno = bp->b_blkno; 1266 dp->b_data = bp->b_data; 1267 dp->b_flags = bp->b_flags; 1268 dp->b_resid = 0; 1269 1270 if (bp->b_flags & B_READ) 1271 write = 0; 1272 else if (FDTESTC(FDB_PROTECT) == 0) 1273 write = 1; 1274 else { 1275 error = EPERM; 1276 goto bad; 1277 } 1278 1279 /* 1280 * figure trk given blkno 1281 */ 1282 trk = bp->b_blkno / sc->nsectors; 1283 1284 /* 1285 * check to see if same as currently cached track 1286 * if so we need to do no dma read. 1287 */ 1288 if (trk == sc->cachetrk) { 1289 fddone(sc); 1290 return; 1291 } 1292 1293 /* 1294 * if we will be overwriting the entire cache, don't bother to 1295 * fetch it. 1296 */ 1297 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1298 bp->b_blkno % sc->nsectors == 0) { 1299 if (sc->flags & FDF_DIRTY) 1300 sc->flags |= FDF_JUSTFLUSH; 1301 else { 1302 sc->cachetrk = trk; 1303 fddone(sc); 1304 return; 1305 } 1306 } 1307 1308 /* 1309 * start dma read of `trk' 1310 */ 1311 fddmastart(sc, trk); 1312 return; 1313 bad: 1314 bp->b_flags |= B_ERROR; 1315 bp->b_error = error; 1316 fddone(sc); 1317 } 1318 1319 /* 1320 * continue a started operation on next track. always begin at 1321 * sector 0 on the next track. 1322 */ 1323 void 1324 fdcont(sc) 1325 struct fd_softc *sc; 1326 { 1327 struct buf *dp, *bp; 1328 int trk, write; 1329 1330 dp = &sc->curbuf; 1331 bp = BUFQ_FIRST(&sc->bufq); 1332 dp->b_data += (dp->b_bcount - bp->b_resid); 1333 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1334 dp->b_bcount = bp->b_resid; 1335 1336 /* 1337 * figure trk given blkno 1338 */ 1339 trk = dp->b_blkno / sc->nsectors; 1340 #ifdef DEBUG 1341 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1342 panic("fdcont: confused"); 1343 #endif 1344 if (dp->b_flags & B_READ) 1345 write = 0; 1346 else 1347 write = 1; 1348 /* 1349 * if we will be overwriting the entire cache, don't bother to 1350 * fetch it. 1351 */ 1352 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1353 if (sc->flags & FDF_DIRTY) 1354 sc->flags |= FDF_JUSTFLUSH; 1355 else { 1356 sc->cachetrk = trk; 1357 fddone(sc); 1358 return; 1359 } 1360 } 1361 /* 1362 * start dma read of `trk' 1363 */ 1364 fddmastart(sc, trk); 1365 return; 1366 } 1367 1368 void 1369 fddmastart(sc, trk) 1370 struct fd_softc *sc; 1371 int trk; 1372 { 1373 int adkmask, ndmaw, write, dmatrk; 1374 1375 #ifdef FDDEBUG 1376 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1377 trk / FDNHEADS, trk % FDNHEADS); 1378 #endif 1379 /* 1380 * flush the cached track if dirty else read requested track. 1381 */ 1382 if (sc->flags & FDF_DIRTY) { 1383 fdcachetoraw(sc); 1384 ndmaw = sc->type->nwritew; 1385 dmatrk = sc->cachetrk; 1386 write = 1; 1387 } else { 1388 ndmaw = sc->type->nreadw; 1389 dmatrk = trk; 1390 write = 0; 1391 } 1392 1393 #ifdef FDDEBUG 1394 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1395 #endif 1396 sc->cachetrk = trk; 1397 fdc_indma = sc; 1398 fdsetpos(sc, dmatrk, write); 1399 1400 /* 1401 * setup dma stuff 1402 */ 1403 if (write == 0) { 1404 custom.adkcon = ADKF_MSBSYNC; 1405 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1406 custom.dsksync = FDMFMSYNC; 1407 } else { 1408 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1409 ADKF_MSBSYNC; 1410 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1411 if (dmatrk >= sc->type->precomp[0]) 1412 adkmask |= ADKF_PRECOMP0; 1413 if (dmatrk >= sc->type->precomp[1]) 1414 adkmask |= ADKF_PRECOMP1; 1415 custom.adkcon = adkmask; 1416 } 1417 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1418 1419 /* 1420 * If writing an MSDOS track, activate disk index pulse 1421 * interrupt, dma will be started in the intr routine fdidxintr() 1422 * Otherwise, start the DMA here. 1423 */ 1424 if (write && sc->openpart == FDMSDOSPART) { 1425 fdc_dmalen = ndmaw; 1426 fdc_dmawrite = write; 1427 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1428 } else { 1429 FDDMASTART(ndmaw, write); 1430 fdc_dmalen = 0; 1431 } 1432 1433 #ifdef FDDEBUG 1434 printf(" dma started\n"); 1435 #endif 1436 } 1437 1438 /* 1439 * recalibrate the drive 1440 */ 1441 void 1442 fdcalibrate(arg) 1443 void *arg; 1444 { 1445 struct fd_softc *sc; 1446 static int loopcnt; 1447 1448 sc = arg; 1449 1450 if (loopcnt == 0) { 1451 /* 1452 * seek cyl 0 1453 */ 1454 fdc_indma = sc; 1455 sc->stepdelay += 900; 1456 if (sc->cachetrk > 1) 1457 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1458 sc->stepdelay -= 900; 1459 } 1460 if (loopcnt++ & 1) 1461 fdsetpos(sc, sc->cachetrk, 0); 1462 else 1463 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1464 /* 1465 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1466 */ 1467 if (loopcnt < 8) 1468 timeout(fdcalibrate, sc, hz / 8); 1469 else { 1470 loopcnt = 0; 1471 fdc_indma = NULL; 1472 timeout(fdmotoroff, sc, 3 * hz / 2); 1473 fddmastart(sc, sc->cachetrk); 1474 } 1475 } 1476 1477 void 1478 fddmadone(sc, timeo) 1479 struct fd_softc *sc; 1480 int timeo; 1481 { 1482 #ifdef FDDEBUG 1483 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1484 #endif 1485 fdc_indma = NULL; 1486 untimeout(fdmotoroff, sc); 1487 FDDMASTOP; 1488 1489 /* 1490 * guarantee the drive has been at current head and cyl 1491 * for at least FDWRITEDELAY after a write. 1492 */ 1493 if (sc->flags & FDF_WRITEWAIT) { 1494 delay(FDWRITEDELAY); 1495 sc->flags &= ~FDF_WRITEWAIT; 1496 } 1497 1498 if ((sc->flags & FDF_MOTOROFF) == 0) { 1499 /* 1500 * motor runs for 1.5 seconds after last dma 1501 */ 1502 timeout(fdmotoroff, sc, 3 * hz / 2); 1503 } 1504 if (sc->flags & FDF_DIRTY) { 1505 /* 1506 * if buffer dirty, the last dma cleaned it 1507 */ 1508 sc->flags &= ~FDF_DIRTY; 1509 if (timeo) 1510 printf("%s: write of track cache timed out.\n", 1511 sc->sc_dv.dv_xname); 1512 if (sc->flags & FDF_JUSTFLUSH) { 1513 sc->flags &= ~FDF_JUSTFLUSH; 1514 /* 1515 * we are done dma'ing 1516 */ 1517 fddone(sc); 1518 return; 1519 } 1520 /* 1521 * load the cache 1522 */ 1523 fddmastart(sc, sc->cachetrk); 1524 return; 1525 } 1526 #ifdef FDDEBUG 1527 else if (sc->flags & FDF_MOTOROFF) 1528 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1529 #endif 1530 1531 /* 1532 * cache loaded decode it into cache buffer 1533 */ 1534 if (timeo == 0 && fdrawtocache(sc) == 0) 1535 sc->retried = 0; 1536 else { 1537 #ifdef FDDEBUG 1538 if (timeo) 1539 printf("%s: fddmadone: cache load timed out.\n", 1540 sc->sc_dv.dv_xname); 1541 #endif 1542 if (sc->retried >= sc->retries) { 1543 sc->retried = 0; 1544 sc->cachetrk = -1; 1545 } else { 1546 sc->retried++; 1547 /* 1548 * this will be restarted at end of calibrate loop. 1549 */ 1550 untimeout(fdmotoroff, sc); 1551 fdcalibrate(sc); 1552 return; 1553 } 1554 } 1555 fddone(sc); 1556 } 1557 1558 void 1559 fddone(sc) 1560 struct fd_softc *sc; 1561 { 1562 struct buf *dp, *bp; 1563 char *data; 1564 int sz; 1565 1566 #ifdef FDDEBUG 1567 printf("fddone: unit %d\n", sc->hwunit); 1568 #endif 1569 /* 1570 * check to see if unit is just flushing the cache, 1571 * that is we have no io queued. 1572 */ 1573 if (sc->flags & FDF_MOTOROFF) 1574 goto nobuf; 1575 1576 dp = &sc->curbuf; 1577 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) 1578 panic ("fddone"); 1579 /* 1580 * check for an error that may have occured 1581 * while getting the track. 1582 */ 1583 if (sc->cachetrk == -1) { 1584 sc->retried = 0; 1585 bp->b_flags |= B_ERROR; 1586 bp->b_error = EIO; 1587 } else if ((bp->b_flags & B_ERROR) == 0) { 1588 data = sc->cachep; 1589 /* 1590 * get offset of data in track cache and limit 1591 * the copy size to not exceed the cache's end. 1592 */ 1593 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1594 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1595 sz *= FDSECSIZE; 1596 sz = min(dp->b_bcount, sz); 1597 if (bp->b_flags & B_READ) 1598 bcopy(data, dp->b_data, sz); 1599 else { 1600 bcopy(dp->b_data, data, sz); 1601 sc->flags |= FDF_DIRTY; 1602 } 1603 bp->b_resid = dp->b_bcount - sz; 1604 if (bp->b_resid == 0) { 1605 bp->b_error = 0; 1606 } else { 1607 /* 1608 * not done yet need to read next track 1609 */ 1610 fdcont(sc); 1611 return; 1612 } 1613 } 1614 /* 1615 * remove from queue. 1616 */ 1617 BUFQ_REMOVE(&sc->bufq, bp); 1618 1619 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1620 1621 biodone(bp); 1622 nobuf: 1623 fdfindwork(sc->sc_dv.dv_unit); 1624 } 1625 1626 void 1627 fdfindwork(unit) 1628 int unit; 1629 { 1630 struct fd_softc *ssc, *sc; 1631 int i, last; 1632 1633 /* 1634 * first see if we have any fdopen()'s waiting 1635 */ 1636 if (fdc_wantwakeup) { 1637 wakeup(fdopen); 1638 fdc_wantwakeup--; 1639 return; 1640 } 1641 1642 /* 1643 * start next available unit, linear search from the next unit 1644 * wrapping and finally this unit. 1645 */ 1646 last = 0; 1647 ssc = NULL; 1648 for (i = unit + 1; last == 0; i++) { 1649 if (i == unit) 1650 last = 1; 1651 if (i >= fd_cd.cd_ndevs) { 1652 i = -1; 1653 continue; 1654 } 1655 if ((sc = fd_cd.cd_devs[i]) == NULL) 1656 continue; 1657 1658 /* 1659 * if unit has requested to be turned off 1660 * and it has no buf's queued do it now 1661 */ 1662 if (sc->flags & FDF_MOTOROFF) { 1663 if (BUFQ_FIRST(&sc->bufq) == NULL) 1664 fdmotoroff(sc); 1665 else { 1666 /* 1667 * we gained a buf request while 1668 * we waited, forget the motoroff 1669 */ 1670 sc->flags &= ~FDF_MOTOROFF; 1671 } 1672 /* 1673 * if we now have dma unit must have needed 1674 * flushing, quit 1675 */ 1676 if (fdc_indma) 1677 return; 1678 } 1679 /* 1680 * if we have no start unit and the current unit has 1681 * io waiting choose this unit to start. 1682 */ 1683 if (ssc == NULL && BUFQ_FIRST(&sc->bufq) != NULL) 1684 ssc = sc; 1685 } 1686 if (ssc) 1687 fdstart(ssc); 1688 } 1689 1690 /* 1691 * min byte count to whats left of the track in question 1692 */ 1693 void 1694 fdminphys(bp) 1695 struct buf *bp; 1696 { 1697 struct fd_softc *sc; 1698 int trk, sec, toff, tsz; 1699 1700 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1701 panic("fdminphys: couldn't get softc"); 1702 1703 trk = bp->b_blkno / sc->nsectors; 1704 sec = bp->b_blkno % sc->nsectors; 1705 1706 toff = sec * FDSECSIZE; 1707 tsz = sc->nsectors * FDSECSIZE; 1708 #ifdef FDDEBUG 1709 printf("fdminphys: before %d", bp->b_bcount); 1710 #endif 1711 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1712 #ifdef FDDEBUG 1713 printf(" after %d\n", bp->b_bcount); 1714 #endif 1715 minphys(bp); 1716 } 1717 1718 /* 1719 * encode the track cache into raw MFM ready for dma 1720 * when we go to multiple disk formats, this will call type dependent 1721 * functions 1722 */ 1723 void fdcachetoraw(sc) 1724 struct fd_softc *sc; 1725 { 1726 if (sc->openpart == FDMSDOSPART) 1727 mscachetoraw(sc); 1728 else 1729 amcachetoraw(sc); 1730 } 1731 1732 /* 1733 * decode raw MFM from dma into units track cache. 1734 * when we go to multiple disk formats, this will call type dependent 1735 * functions 1736 */ 1737 int 1738 fdrawtocache(sc) 1739 struct fd_softc *sc; 1740 { 1741 1742 if (sc->openpart == FDMSDOSPART) 1743 return(msrawtocache(sc)); 1744 else 1745 return(amrawtocache(sc)); 1746 } 1747 1748 void 1749 amcachetoraw(sc) 1750 struct fd_softc *sc; 1751 { 1752 static u_long mfmnull[4]; 1753 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1754 int sec, i; 1755 1756 rp = fdc_dmap; 1757 1758 /* 1759 * not yet one sector (- 1 long) gap. 1760 * for now use previous drivers values 1761 */ 1762 for (i = 0; i < sc->type->gap; i++) 1763 *rp++ = 0xaaaaaaaa; 1764 /* 1765 * process sectors 1766 */ 1767 dp = sc->cachep; 1768 zero = 0; 1769 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1770 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1771 hcksum = dcksum = 0; 1772 /* 1773 * sector format 1774 * offset description 1775 *----------------------------------- 1776 * 0 null 1777 * 1 sync 1778 * oddbits evenbits 1779 *---------------------- 1780 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1781 * 4-7 8-11 null 1782 * 12 13 header cksum [2-11] 1783 * 14 15 data cksum [16-271] 1784 * 16-143 144-271 data 1785 */ 1786 *rp = 0xaaaaaaaa; 1787 if (*(rp - 1) & 0x1) 1788 *rp &= 0x7fffffff; /* clock bit correction */ 1789 rp++; 1790 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1791 rp = mfmblkencode(&info, rp, &hcksum, 1); 1792 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1793 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1794 1795 crp = rp; 1796 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1797 dp += FDSECLWORDS; 1798 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1799 if (*(crp - 1) & 0x1) 1800 *crp &= 0x7fffffff; /* clock bit correction */ 1801 else if ((*crp & 0x40000000) == 0) 1802 *crp |= 0x80000000; 1803 } 1804 *rp = 0xaaa80000; 1805 if (*(rp - 1) & 0x1) 1806 *rp &= 0x7fffffff; 1807 } 1808 1809 u_long * 1810 fdfindsync(rp, ep) 1811 u_long *rp, *ep; 1812 { 1813 u_short *sp; 1814 1815 sp = (u_short *)rp; 1816 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1817 sp++; 1818 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1819 sp++; 1820 if ((u_long *)sp < ep) 1821 return((u_long *)sp); 1822 return(NULL); 1823 } 1824 1825 int 1826 amrawtocache(sc) 1827 struct fd_softc *sc; 1828 { 1829 u_long mfmnull[4]; 1830 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1831 int cnt, doagain; 1832 1833 doagain = 1; 1834 srp = rp = fdc_dmap; 1835 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1836 cnt = 0; 1837 again: 1838 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1839 #ifdef DIAGNOSTIC 1840 printf("%s: corrupted track (%d) data.\n", 1841 sc->sc_dv.dv_xname, sc->cachetrk); 1842 #endif 1843 return(-1); 1844 } 1845 1846 /* 1847 * process sectors 1848 */ 1849 for (; cnt < sc->nsectors; cnt++) { 1850 hcksum = dcksum = 0; 1851 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1852 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1853 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1854 if (cktmp != hcksum) { 1855 #ifdef FDDEBUG 1856 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1857 info, hcksum, cktmp); 1858 #endif 1859 goto again; 1860 } 1861 if (((info >> 16) & 0xff) != sc->cachetrk) { 1862 #ifdef DEBUG 1863 printf("%s: incorrect track found: 0x%lx %d\n", 1864 sc->sc_dv.dv_xname, info, sc->cachetrk); 1865 #endif 1866 goto again; 1867 } 1868 #ifdef FDDEBUG 1869 printf(" info 0x%x\n", info); 1870 #endif 1871 1872 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1873 dp = sc->cachep; 1874 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1875 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1876 if (cktmp != dcksum) { 1877 #ifdef FDDEBUG 1878 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1879 info, dcksum, cktmp); 1880 #endif 1881 goto again; 1882 } 1883 1884 /* 1885 * if we are at gap then we can no longer be sure 1886 * of correct sync marks 1887 */ 1888 if ((info && 0xff) == 1) 1889 doagain = 1; 1890 else 1891 doagain = 0; 1892 srp = rp = fdfindsync(crp, erp); 1893 } 1894 return(0); 1895 } 1896 1897 void 1898 mscachetoraw(sc) 1899 struct fd_softc *sc; 1900 { 1901 u_short *rp, *erp, crc; 1902 u_char *cp, tb[5]; 1903 int sec, i; 1904 1905 rp = (u_short *)fdc_dmap; 1906 erp = rp + sc->type->nwritew; 1907 cp = sc->cachep; 1908 1909 /* 1910 * initial track filler (828 * GAP1) 1911 */ 1912 for (i = 0; i < sc->type->gap; i++) { 1913 *rp++ = FDMFMGAP1; 1914 *rp++ = FDMFMGAP1; 1915 } 1916 1917 for (sec = 0; sec < sc->nsectors; sec++) { 1918 1919 /* 1920 * leading sector gap 1921 * (12 * GAP2) + (3 * SYNC) 1922 */ 1923 for (i = 0; i < 12; i++) 1924 *rp++ = FDMFMGAP2; 1925 *rp++ = FDMFMSYNC; 1926 *rp++ = FDMFMSYNC; 1927 *rp++ = FDMFMSYNC; 1928 1929 /* 1930 * sector information 1931 * (ID) + track + side + sector + sector size + CRC16 1932 */ 1933 *rp++ = FDMFMID; 1934 tb[0] = sc->cachetrk / FDNHEADS; 1935 tb[1] = sc->cachetrk % FDNHEADS; 1936 tb[2] = sec + 1; 1937 i = sc->bytespersec; 1938 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1939 rp = msblkencode(rp, tb, 4, &crc); 1940 tb[0] = crc >> 8; 1941 tb[1] = crc & 0xff; 1942 tb[2] = 0x4e; /* GAP1 decoded */ 1943 rp = msblkencode(rp, tb, 3, 0); 1944 1945 /* 1946 * sector info/data gap 1947 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1948 */ 1949 for (i = 0; i < 21; i++) 1950 *rp++ = FDMFMGAP1; 1951 for (i = 0; i < 12; i++) 1952 *rp++ = FDMFMGAP2; 1953 *rp++ = FDMFMSYNC; 1954 *rp++ = FDMFMSYNC; 1955 *rp++ = FDMFMSYNC; 1956 1957 /* 1958 * sector data 1959 * (DATA) + ...data... + CRC16 1960 */ 1961 *rp++ = FDMFMDATA; 1962 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1963 cp += sc->bytespersec; 1964 tb[0] = crc >> 8; 1965 tb[1] = crc & 0xff; 1966 tb[2] = 0x4e; /* GAP3 decoded */ 1967 rp = msblkencode(rp, tb, 3, 0); 1968 1969 /* 1970 * trailing sector gap 1971 * (80 * GAP3) 1972 */ 1973 for (i = 0; i < 79; i++) 1974 *rp++ = FDMFMGAP3; 1975 } 1976 1977 /* 1978 * fill rest of track with GAP3 1979 */ 1980 while (rp != erp) 1981 *rp++ = FDMFMGAP3; 1982 1983 } 1984 1985 int 1986 msrawtocache(sc) 1987 struct fd_softc *sc; 1988 { 1989 u_short *rp, *srp, *erp; 1990 u_char tb[5], *cp; 1991 int ct, sec, retry; 1992 1993 srp = rp = (u_short *)fdc_dmap; 1994 erp = rp + sc->type->nreadw; 1995 cp = sc->cachep; 1996 1997 for (ct = 0; ct < sc->nsectors; ct++) { 1998 retry = 1; 1999 do { 2000 /* 2001 * skip leading gap to sync 2002 */ 2003 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 2004 #ifdef DIAGNOSTIC 2005 printf("%s: corrupted track (%d) data.\n", 2006 sc->sc_dv.dv_xname, sc->cachetrk); 2007 #endif 2008 return(-1); 2009 } 2010 2011 /* 2012 * Grab sector info 2013 */ 2014 if (*rp++ != FDMFMID) 2015 continue; 2016 rp = msblkdecode(rp, tb, 4); 2017 #ifdef FDDEBUG 2018 printf("sector id: sector %d, track %d, side %d," 2019 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 2020 #endif 2021 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 2022 tb[2] > sc->nsectors) 2023 continue; 2024 2025 sec = tb[2]; 2026 sc->bytespersec = 128 << tb[3]; 2027 rp += 2; /* skip CRC-16 */ 2028 2029 /* 2030 * skip gap and read in data 2031 */ 2032 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 2033 return(-1); 2034 if (*rp++ != FDMFMDATA) 2035 continue; 2036 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 2037 sc->bytespersec); 2038 rp += 2; /* skip CRC-16 */ 2039 2040 retry = 0; 2041 } while (retry); 2042 } 2043 return(0); 2044 } 2045 2046 /* 2047 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2048 * this format specified that the odd bits are at current pos and even 2049 * bits at len + current pos 2050 */ 2051 u_long * 2052 mfmblkencode(dp, rp, cp, len) 2053 u_long *dp, *rp, *cp; 2054 int len; 2055 { 2056 u_long *sdp, *edp, d, dtmp, correct; 2057 2058 sdp = dp; 2059 edp = dp + len; 2060 2061 if (*(rp - 1) & 0x1) 2062 correct = 1; 2063 else 2064 correct = 0; 2065 /* 2066 * do odd bits 2067 */ 2068 while (dp < edp) { 2069 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2070 dtmp = d ^ 0x55555555; 2071 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2072 /* 2073 * correct upper clock bit if needed 2074 */ 2075 if (correct) 2076 d &= 0x7fffffff; 2077 if (d & 0x1) 2078 correct = 1; 2079 else 2080 correct = 0; 2081 /* 2082 * do checksums and store in raw buffer 2083 */ 2084 if (cp) 2085 *cp ^= d; 2086 *rp++ = d; 2087 dp++; 2088 } 2089 /* 2090 * do even bits 2091 */ 2092 dp = sdp; 2093 while (dp < edp) { 2094 d = *dp & 0x55555555; /* remove clock bits */ 2095 dtmp = d ^ 0x55555555; 2096 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2097 /* 2098 * correct upper clock bit if needed 2099 */ 2100 if (correct) 2101 d &= 0x7fffffff; 2102 if (d & 0x1) 2103 correct = 1; 2104 else 2105 correct = 0; 2106 /* 2107 * do checksums and store in raw buffer 2108 */ 2109 if (cp) 2110 *cp ^= d; 2111 *rp++ = d; 2112 dp++; 2113 } 2114 if (cp) 2115 *cp &= 0x55555555; 2116 return(rp); 2117 } 2118 2119 /* 2120 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2121 * this format specified that the odd bits are at current pos and even 2122 * bits at len + current pos 2123 */ 2124 u_long * 2125 mfmblkdecode(rp, dp, cp, len) 2126 u_long *rp, *dp, *cp; 2127 int len; 2128 { 2129 u_long o, e; 2130 int cnt; 2131 2132 cnt = len; 2133 while (cnt--) { 2134 o = *rp; 2135 e = *(rp + len); 2136 if (cp) { 2137 *cp ^= o; 2138 *cp ^= e; 2139 } 2140 o &= 0x55555555; 2141 e &= 0x55555555; 2142 *dp++ = (o << 1) | e; 2143 rp++; 2144 } 2145 if (cp) 2146 *cp &= 0x55555555; 2147 return(rp + len); 2148 } 2149 2150 /* 2151 * decode len words in standard MFM format to len bytes 2152 * of data. 2153 */ 2154 u_short * 2155 msblkdecode(rp, cp, len) 2156 u_short *rp; 2157 u_char *cp; 2158 int len; 2159 { 2160 while (len--) { 2161 *cp++ = msdecode[*rp & 0x7f] | 2162 (msdecode[(*rp >> 8) & 0x7f] << 4); 2163 rp++; 2164 } 2165 2166 return(rp); 2167 } 2168 2169 /* 2170 * encode len bytes of data into len words in standard MFM format. 2171 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2172 * as well. 2173 */ 2174 u_short * 2175 msblkencode(rp, cp, len, crc) 2176 u_short *rp; 2177 u_char *cp; 2178 int len; 2179 u_short *crc; 2180 { 2181 u_short td; 2182 u_short mycrc; 2183 2184 /* preload crc for header (4 bytes) 2185 * or data (anything else) 2186 */ 2187 mycrc = (len == 4) ? 0xb230 : 0xe295; 2188 2189 while (len--) { 2190 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2191 2192 /* Check for zeros in top bit of encode and bottom 2193 * bit of previous encode. if so, slap a one in betweem 2194 * them. 2195 */ 2196 if ((td & 0x140) == 0) 2197 td |= 0x80; 2198 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2199 td |= 0x8000; 2200 2201 *rp++ = td; 2202 2203 /* 2204 * calc crc if requested 2205 */ 2206 if (crc) 2207 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2208 2209 cp++; 2210 } 2211 2212 if (crc) 2213 *crc = mycrc; 2214 2215 return(rp); 2216 } 2217 2218 int 2219 fddump(dev, blkno, va, size) 2220 dev_t dev; 2221 daddr_t blkno; 2222 caddr_t va; 2223 size_t size; 2224 { 2225 return (EINVAL); 2226 } 2227
Indexes created Thu Oct 02 14:10:14 GMT 2025