fd.c revision 1.40.20.1
1 /* $NetBSD: fd.c,v 1.40.20.1 1999/12/21 23:15:54 wrstuden 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 b_cylin b_resid 72 #define FDUNIT(dev) DISKUNIT(dev) 73 #define FDPART(dev) DISKPART(dev) 74 #define FDMAKEDEV(m, u, p) MAKEDISKDEV((m), (u), (p)) 75 76 /* that's nice, but we don't want to always use this as an amiga drive 77 bunghole :-) */ 78 #define FDNHEADS (2) /* amiga drives always have 2 heads */ 79 #define FDSECSIZE (512) /* amiga drives always have 512 byte sectors */ 80 #define FDSECLWORDS (128) 81 82 #define FDSETTLEDELAY (18000) /* usec delay after seeking after switch dir */ 83 #define FDSTEPDELAY (3500) /* usec delay after steping */ 84 #define FDPRESIDEDELAY (1000) /* usec delay before writing can occur */ 85 #define FDWRITEDELAY (1300) /* usec delay after write */ 86 87 #define FDSTEPOUT (1) /* decrease track step */ 88 #define FDSTEPIN (0) /* increase track step */ 89 90 #define FDCUNITMASK (0x78) /* mask for all units (bits 6-3) */ 91 92 #define FDRETRIES (2) /* default number of retries */ 93 #define FDMAXUNITS (4) /* maximum number of supported units */ 94 95 #define DISKLEN_READ (0) /* fake mask for reading */ 96 #define DISKLEN_WRITE (1 << 14) /* bit for writing */ 97 #define DISKLEN_DMAEN (1 << 15) /* dma go */ 98 #define DMABUFSZ ((DISKLEN_WRITE - 1) * 2) /* largest dma possible */ 99 100 #define FDMFMSYNC (0x4489) 101 #define FDMFMID (0x5554) 102 #define FDMFMDATA (0x5545) 103 #define FDMFMGAP1 (0x9254) 104 #define FDMFMGAP2 (0xAAAA) 105 #define FDMFMGAP3 (0x9254) 106 #define CRC16POLY (0x1021) /* (x^16) + x^12 + x^5 + x^0 */ 107 108 /* 109 * Msdos-type MFM encode/decode 110 */ 111 static u_char msdecode[128]; 112 static u_char msencode[16] = 113 { 114 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 115 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 116 }; 117 static u_short mscrctab[256]; 118 119 /* 120 5554 aaaa aaaa aaa5 2aa4 4452 aa51 121 00 00 03 02 ac 0d 122 */ 123 124 /* 125 * floppy device type 126 */ 127 struct fdtype { 128 u_int driveid; /* drive identification (from drive) */ 129 u_int ncylinders; /* number of cylinders on drive */ 130 u_int amiga_nsectors; /* number of sectors per amiga track */ 131 u_int msdos_nsectors; /* number of sectors per msdos track */ 132 u_int nreadw; /* number of words (short) read per track */ 133 u_int nwritew; /* number of words (short) written per track */ 134 u_int gap; /* track gap size in long words */ 135 u_int precomp[2]; /* 1st and 2nd precomp values */ 136 char *desc; /* description of drive type (useq) */ 137 }; 138 139 /* 140 * floppy disk device data 141 */ 142 struct fd_softc { 143 struct device sc_dv; /* generic device info; must come first */ 144 struct disk dkdev; /* generic disk info */ 145 struct buf bufq; /* queue of buf's */ 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 sc->curcyl = sc->cachetrk = -1; 389 sc->openpart = -1; 390 sc->type = ap->type; 391 sc->hwunit = ap->unit; 392 sc->unitmask = 1 << (3 + ap->unit); 393 sc->retries = FDRETRIES; 394 sc->stepdelay = FDSTEPDELAY; 395 sc->bytespersec = 512; 396 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 397 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 398 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 399 400 /* 401 * Initialize and attach the disk structure. 402 */ 403 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 404 sc->dkdev.dk_driver = &fddkdriver; 405 disk_attach(&sc->dkdev); 406 407 /* 408 * calibrate the drive 409 */ 410 fdsetpos(sc, 0, 0); 411 fdsetpos(sc, sc->type->ncylinders, 0); 412 fdsetpos(sc, 0, 0); 413 fdmotoroff(sc); 414 415 /* 416 * precalc msdos MFM and CRC 417 */ 418 for (i = 0; i < 128; i++) 419 msdecode[i] = 0xff; 420 for (i = 0; i < 16; i++) 421 msdecode[msencode[i]] = i; 422 for (i = 0; i < 256; i++) { 423 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 424 (0x1021 * (i >> 4)); 425 } 426 427 /* 428 * enable disk related interrupts 429 */ 430 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 431 custom.intena = INTF_SETCLR | INTF_DSKBLK; 432 ciab.icr = CIA_ICR_FLG; 433 } 434 435 /*ARGSUSED*/ 436 int 437 fdopen(dev, flags, devtype, p) 438 dev_t dev; 439 int flags, devtype; 440 struct proc *p; 441 { 442 struct fd_softc *sc; 443 int wasopen, fwork, error, s; 444 445 error = 0; 446 447 if (FDPART(dev) >= FDMAXPARTS) 448 return(ENXIO); 449 450 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 451 return(ENXIO); 452 if (sc->flags & FDF_NOTRACK0) 453 return(ENXIO); 454 if (sc->cachep == NULL) 455 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 456 457 s = splbio(); 458 /* 459 * if we are sleeping in fdclose(); waiting for a chance to 460 * shut the motor off, do a sleep here also. 461 */ 462 while (sc->flags & FDF_WMOTOROFF) 463 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 464 465 fwork = 0; 466 /* 467 * if not open let user open request type, otherwise 468 * ensure they are trying to open same type. 469 */ 470 if (sc->openpart == FDPART(dev)) 471 wasopen = 1; 472 else if (sc->openpart == -1) { 473 sc->openpart = FDPART(dev); 474 wasopen = 0; 475 } else { 476 wasopen = 1; 477 error = EPERM; 478 goto done; 479 } 480 481 /* 482 * wait for current io to complete if any 483 */ 484 if (fdc_indma) { 485 fwork = 1; 486 fdc_wantwakeup++; 487 tsleep(fdopen, PRIBIO, "fdopen", 0); 488 } 489 if ((error = fdloaddisk(sc)) != 0) 490 goto done; 491 if ((error = fdgetdisklabel(sc, dev)) != 0) 492 goto done; 493 #ifdef FDDEBUG 494 printf(" open successful\n"); 495 #endif 496 done: 497 /* 498 * if we requested that fddone()->fdfindwork() wake us, allow it to 499 * complete its job now 500 */ 501 if (fwork) 502 fdfindwork(FDUNIT(dev)); 503 splx(s); 504 505 /* 506 * if we were not open and we marked us so reverse that. 507 */ 508 if (error && wasopen == 0) 509 sc->openpart = -1; 510 return(error); 511 } 512 513 /*ARGSUSED*/ 514 int 515 fdclose(dev, flags, devtype, p) 516 dev_t dev; 517 int flags, devtype; 518 struct proc *p; 519 { 520 struct fd_softc *sc; 521 int s; 522 523 #ifdef FDDEBUG 524 printf("fdclose()\n"); 525 #endif 526 sc = getsoftc(fd_cd, FDUNIT(dev)); 527 s = splbio(); 528 if (sc->flags & FDF_MOTORON) { 529 sc->flags |= FDF_WMOTOROFF; 530 tsleep(fdmotoroff, PRIBIO, "fdclose", 0); 531 sc->flags &= ~FDF_WMOTOROFF; 532 wakeup(fdmotoroff); 533 } 534 sc->openpart = -1; 535 splx(s); 536 return(0); 537 } 538 539 int 540 fdioctl(dev, cmd, addr, flag, p) 541 dev_t dev; 542 u_long cmd; 543 caddr_t addr; 544 int flag; 545 struct proc *p; 546 { 547 struct fd_softc *sc; 548 int error, wlab; 549 550 sc = getsoftc(fd_cd, FDUNIT(dev)); 551 552 if ((sc->flags & FDF_HAVELABEL) == 0) 553 return(EBADF); 554 555 switch (cmd) { 556 case DIOCSBAD: 557 return(EINVAL); 558 case DIOCSRETRIES: 559 if (*(int *)addr < 0) 560 return(EINVAL); 561 sc->retries = *(int *)addr; 562 return(0); 563 case DIOCSSTEP: 564 if (*(int *)addr < FDSTEPDELAY) 565 return(EINVAL); 566 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 567 return(0); 568 case DIOCGDINFO: 569 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 570 return(0); 571 case DIOCGPART: 572 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 573 ((struct partinfo *)addr)->part = 574 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 575 return(0); 576 case DIOCSDINFO: 577 if ((flag & FWRITE) == 0) 578 return(EBADF); 579 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 580 case DIOCWDINFO: 581 if ((flag & FWRITE) == 0) 582 return(EBADF); 583 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 584 return(error); 585 wlab = sc->wlabel; 586 sc->wlabel = 1; 587 error = fdputdisklabel(sc, dev); 588 sc->wlabel = wlab; 589 return(error); 590 case DIOCWLABEL: 591 if ((flag & FWRITE) == 0) 592 return(EBADF); 593 sc->wlabel = *(int *)addr; 594 return(0); 595 case DIOCGDEFLABEL: 596 fdgetdefaultlabel(sc, (struct disklabel *)addr, FDPART(dev)); 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 void 743 fdgetdefaultlabel(sc, lp, part) 744 struct fd_softc *sc; 745 struct disklabel *lp; 746 int part; /* XXX ick */ 747 { 748 749 bzero(lp, sizeof(struct disklabel)); 750 lp->d_secsize = FDSECSIZE; 751 lp->d_ntracks = FDNHEADS; 752 lp->d_ncylinders = sc->type->ncylinders; 753 lp->d_nsectors = sc->nsectors; 754 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 755 lp->d_type = DTYPE_FLOPPY; 756 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 757 lp->d_rpm = 300; /* good guess I suppose. */ 758 lp->d_interleave = 1; /* should change when adding msdos */ 759 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 760 lp->d_bbsize = 0; 761 lp->d_sbsize = 0; 762 lp->d_partitions[part].p_size = lp->d_secperunit; 763 lp->d_partitions[part].p_fstype = FS_UNUSED; 764 lp->d_partitions[part].p_fsize = 1024; 765 lp->d_partitions[part].p_frag = 8; 766 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 767 lp->d_npartitions = part + 1; 768 lp->d_magic = lp->d_magic2 = DISKMAGIC; 769 lp->d_checksum = dkcksum(lp); 770 } 771 772 /* 773 * read disk label, if present otherwise create one 774 * return a new label if raw part and none found, otherwise err. 775 */ 776 int 777 fdgetdisklabel(sc, dev) 778 struct fd_softc *sc; 779 dev_t dev; 780 { 781 struct disklabel *lp, *dlp; 782 struct cpu_disklabel *clp; 783 struct buf *bp; 784 int error, part; 785 786 if (sc->flags & FDF_HAVELABEL && 787 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 788 return(0); 789 #ifdef FDDEBUG 790 printf("fdgetdisklabel()\n"); 791 #endif 792 part = FDPART(dev); 793 lp = sc->dkdev.dk_label; 794 clp = sc->dkdev.dk_cpulabel; 795 bzero(lp, sizeof(struct disklabel)); 796 bzero(clp, sizeof(struct cpu_disklabel)); 797 798 lp->d_secsize = FDSECSIZE; 799 lp->d_ntracks = FDNHEADS; 800 lp->d_ncylinders = sc->type->ncylinders; 801 lp->d_nsectors = sc->nsectors; 802 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 803 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 804 lp->d_npartitions = part + 1; 805 lp->d_partitions[part].p_size = lp->d_secperunit; 806 lp->d_partitions[part].p_fstype = FS_UNUSED; 807 lp->d_partitions[part].p_fsize = 1024; 808 lp->d_partitions[part].p_frag = 8; 809 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 810 811 sc->flags |= FDF_HAVELABEL; 812 813 bp = (void *)geteblk((int)lp->d_secsize); 814 if (bp->b_bshift < 0) 815 goto nolabel; 816 bp->b_dev = dev; 817 bp->b_bshift = intlog2(FDSECSIZE); 818 bp->b_bsize = FDSECSIZE; 819 bp->b_blkno = 0; 820 bp->b_cylin = 0; 821 bp->b_bcount = FDSECSIZE; 822 bp->b_flags = B_BUSY | B_READ; 823 fdstrategy(bp); 824 if ((error = biowait(bp)) != 0) 825 goto nolabel; 826 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 827 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 828 dkcksum(dlp)) { 829 error = EINVAL; 830 return(0); 831 } 832 833 /* 834 * set the incore copy of this units disklabel 835 */ 836 int 837 fdsetdisklabel(sc, lp) 838 struct fd_softc *sc; 839 struct disklabel *lp; 840 { 841 struct disklabel *clp; 842 struct partition *pp; 843 844 /* 845 * must have at least opened raw unit to fetch the 846 * raw_part stuff. 847 */ 848 if ((sc->flags & FDF_HAVELABEL) == 0) 849 return(EINVAL); 850 clp = sc->dkdev.dk_label; 851 /* 852 * make sure things check out and we only have one valid 853 * partition 854 */ 855 #ifdef FDDEBUG 856 printf("fdsetdisklabel\n"); 857 #endif 858 if (lp->d_secsize != FDSECSIZE || 859 lp->d_nsectors != clp->d_nsectors || 860 lp->d_ntracks != FDNHEADS || 861 lp->d_ncylinders != clp->d_ncylinders || 862 lp->d_secpercyl != clp->d_secpercyl || 863 lp->d_secperunit != clp->d_secperunit || 864 lp->d_magic != DISKMAGIC || 865 lp->d_magic2 != DISKMAGIC || 866 lp->d_npartitions == 0 || 867 lp->d_npartitions > FDMAXPARTS || 868 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 869 dkcksum(lp)) 870 return(EINVAL); 871 /* 872 * if any partitions are present make sure they 873 * represent the currently open type 874 */ 875 if ((pp = &lp->d_partitions[0])->p_size) { 876 if ((pp = &lp->d_partitions[1])->p_size == 0) 877 goto done; 878 else if (sc->openpart != 1) 879 return(EINVAL); 880 } else if (sc->openpart != 0) 881 return(EINVAL); 882 /* 883 * make sure selected partition is within bounds 884 * XXX on the second check, its to handle a bug in 885 * XXX the cluster routines as they require mutliples 886 * XXX of CLBYTES currently 887 */ 888 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 889 (pp->p_frag * pp->p_fsize % CLBYTES)) 890 return(EINVAL); 891 done: 892 bcopy(lp, clp, sizeof(struct disklabel)); 893 return(0); 894 } 895 896 /* 897 * write out the incore copy of this units disklabel 898 */ 899 int 900 fdputdisklabel(sc, dev) 901 struct fd_softc *sc; 902 dev_t dev; 903 { 904 struct disklabel *lp, *dlp; 905 struct buf *bp; 906 int error; 907 908 if ((sc->flags & FDF_HAVELABEL) == 0) 909 return(EBADF); 910 #ifdef FDDEBUG 911 printf("fdputdisklabel\n"); 912 #endif 913 /* 914 * get buf and read in sector 0 915 */ 916 dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 917 lp = sc->dkdev.dk_label; 918 bp = (void *)geteblk((int)lp->d_secsize); 919 if (bp->b_bshift < 0) 920 goto done; 921 bp->b_dev = dev; 922 bp->b_bshift = intlog2(FDSECSIZE); 923 bp->b_bsize = FDSECSIZE; 924 bp->b_blkno = 0; 925 bp->b_cylin = 0; 926 bp->b_bcount = FDSECSIZE; 927 bp->b_flags = B_BUSY | B_READ; 928 fdstrategy(bp); 929 if ((error = biowait(bp)) != 0) 930 goto done; 931 /* 932 * copy disklabel to buf and write it out syncronous 933 */ 934 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 935 bcopy(lp, dlp, sizeof(struct disklabel)); 936 bp->b_blkno = 0; 937 bp->b_cylin = 0; 938 bp->b_flags = B_WRITE; 939 fdstrategy(bp); 940 error = biowait(bp); 941 done: 942 brelse(bp); 943 return(error); 944 } 945 946 /* 947 * figure out drive type or NULL if none. 948 */ 949 struct fdtype * 950 fdcgetfdtype(unit) 951 int unit; 952 { 953 struct fdtype *ftp; 954 u_long id, idb; 955 int cnt, umask; 956 957 id = 0; 958 umask = 1 << (3 + unit); 959 960 FDDESELECT(FDCUNITMASK); 961 962 FDSETMOTOR(1); 963 delay(1); 964 FDSELECT(umask); 965 delay(1); 966 FDDESELECT(umask); 967 968 FDSETMOTOR(0); 969 delay(1); 970 FDSELECT(umask); 971 delay(1); 972 FDDESELECT(umask); 973 974 for (idb = 0x80000000; idb; idb >>= 1) { 975 FDSELECT(umask); 976 delay(1); 977 if (FDTESTC(FDB_READY) == 0) 978 id |= idb; 979 FDDESELECT(umask); 980 delay(1); 981 } 982 #ifdef FDDEBUG 983 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 984 #endif 985 986 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 987 if (ftp->driveid == id) 988 return(ftp); 989 /* 990 * 3.5dd's at unit 0 do not always return id. 991 */ 992 if (unit == 0) 993 return(fdtype); 994 return(NULL); 995 } 996 997 /* 998 * turn motor off if possible otherwise mark as needed and will be done 999 * later. 1000 */ 1001 void 1002 fdmotoroff(arg) 1003 void *arg; 1004 { 1005 struct fd_softc *sc; 1006 int s; 1007 1008 sc = arg; 1009 s = splbio(); 1010 1011 #ifdef FDDEBUG 1012 printf("fdmotoroff: unit %d\n", sc->hwunit); 1013 #endif 1014 if ((sc->flags & FDF_MOTORON) == 0) 1015 goto done; 1016 /* 1017 * if we have a timeout on a dma operation let fddmadone() 1018 * deal with it. 1019 */ 1020 if (fdc_indma == sc) { 1021 fddmadone(sc, 1); 1022 goto done; 1023 } 1024 #ifdef FDDEBUG 1025 printf(" motor was on, turning off\n"); 1026 #endif 1027 1028 /* 1029 * flush cache if needed 1030 */ 1031 if (sc->flags & FDF_DIRTY) { 1032 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1033 #ifdef FDDEBUG 1034 printf(" flushing dirty buffer first\n"); 1035 #endif 1036 /* 1037 * if dma'ing done for now, fddone() will call us again 1038 */ 1039 if (fdc_indma) 1040 goto done; 1041 fddmastart(sc, sc->cachetrk); 1042 goto done; 1043 } 1044 1045 /* 1046 * if controller is busy just schedule us to be called back 1047 */ 1048 if (fdc_indma) { 1049 /* 1050 * someone else has the controller now 1051 * just set flag and let fddone() call us again. 1052 */ 1053 sc->flags |= FDF_MOTOROFF; 1054 goto done; 1055 } 1056 1057 #ifdef FDDEBUG 1058 printf(" hw turning unit off\n"); 1059 #endif 1060 1061 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1062 FDDESELECT(FDCUNITMASK); 1063 FDSETMOTOR(0); 1064 delay(1); 1065 FDSELECT(sc->unitmask); 1066 delay(4); 1067 FDDESELECT(sc->unitmask); 1068 delay(1); 1069 if (sc->flags & FDF_WMOTOROFF) 1070 wakeup(fdmotoroff); 1071 done: 1072 splx(s); 1073 } 1074 1075 /* 1076 * select drive seek to track exit with motor on. 1077 * fdsetpos(x, 0, 0) does calibrates the drive. 1078 */ 1079 void 1080 fdsetpos(sc, trk, towrite) 1081 struct fd_softc *sc; 1082 int trk, towrite; 1083 { 1084 int nstep, sdir, ondly, ncyl, nside; 1085 1086 FDDESELECT(FDCUNITMASK); 1087 FDSETMOTOR(1); 1088 delay(1); 1089 FDSELECT(sc->unitmask); 1090 delay(1); 1091 if ((sc->flags & FDF_MOTORON) == 0) { 1092 ondly = 0; 1093 while (FDTESTC(FDB_READY) == 0) { 1094 delay(1000); 1095 if (++ondly >= 1000) 1096 break; 1097 } 1098 } 1099 sc->flags |= FDF_MOTORON; 1100 1101 ncyl = trk / FDNHEADS; 1102 nside = trk % FDNHEADS; 1103 1104 if (sc->curcyl == ncyl && fdc_side == nside) 1105 return; 1106 1107 if (towrite) 1108 sc->flags |= FDF_WRITEWAIT; 1109 1110 #ifdef FDDEBUG 1111 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1112 trk % FDNHEADS, towrite); 1113 #endif 1114 nstep = ncyl - sc->curcyl; 1115 if (nstep) { 1116 /* 1117 * figure direction 1118 */ 1119 if (nstep > 0 && ncyl != 0) { 1120 sdir = FDSTEPIN; 1121 FDSETDIR(1); 1122 } else { 1123 nstep = -nstep; 1124 sdir = FDSTEPOUT; 1125 FDSETDIR(0); 1126 } 1127 if (ncyl == 0) { 1128 /* 1129 * either just want cylinder 0 or doing 1130 * a calibrate. 1131 */ 1132 nstep = 256; 1133 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1134 FDSTEP; 1135 delay(sc->stepdelay); 1136 } 1137 if (nstep < 0) 1138 sc->flags |= FDF_NOTRACK0; 1139 } else { 1140 /* 1141 * step the needed amount amount. 1142 */ 1143 while (nstep--) { 1144 FDSTEP; 1145 delay(sc->stepdelay); 1146 } 1147 } 1148 /* 1149 * if switched directions 1150 * allow drive to settle. 1151 */ 1152 if (sc->pstepdir != sdir) 1153 delay(FDSETTLEDELAY); 1154 sc->pstepdir = sdir; 1155 sc->curcyl = ncyl; 1156 } 1157 if (nside == fdc_side) 1158 return; 1159 /* 1160 * select side 1161 */ 1162 fdc_side = nside; 1163 FDSETHEAD(nside); 1164 delay(FDPRESIDEDELAY); 1165 } 1166 1167 void 1168 fdselunit(sc) 1169 struct fd_softc *sc; 1170 { 1171 FDDESELECT(FDCUNITMASK); /* deselect all */ 1172 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1173 delay(1); 1174 FDSELECT(sc->unitmask); /* select unit */ 1175 delay(1); 1176 } 1177 1178 /* 1179 * process next buf on device queue. 1180 * normall sequence of events: 1181 * fdstart() -> fddmastart(); 1182 * fdidxintr(); 1183 * fdintr() -> fddmadone() -> fddone(); 1184 * if the track is in the cache then fdstart() will short-circuit 1185 * to fddone() else if the track cache is dirty it will flush. If 1186 * the buf is not an entire track it will cache the requested track. 1187 */ 1188 void 1189 fdstart(sc) 1190 struct fd_softc *sc; 1191 { 1192 int trk, error, write; 1193 struct buf *bp, *dp; 1194 int changed; 1195 1196 #ifdef FDDEBUG 1197 printf("fdstart: unit %d\n", sc->hwunit); 1198 #endif 1199 1200 /* 1201 * if dma'ing just return. we must have been called from fdstartegy. 1202 */ 1203 if (fdc_indma) 1204 return; 1205 1206 /* 1207 * get next buf if there. 1208 */ 1209 dp = &sc->bufq; 1210 if ((bp = dp->b_actf) == NULL) { 1211 #ifdef FDDEBUG 1212 printf(" nothing to do\n"); 1213 #endif 1214 return; 1215 } 1216 1217 /* 1218 * Mark us as busy now, in case fddone() gets called in one 1219 * of the cases below. 1220 */ 1221 disk_busy(&sc->dkdev); 1222 1223 /* 1224 * make sure same disk is loaded 1225 */ 1226 fdselunit(sc); 1227 changed = FDTESTC(FDB_CHANGED); 1228 FDDESELECT(sc->unitmask); 1229 if (changed) { 1230 /* 1231 * disk missing, invalidate all future io on 1232 * this unit until re-open()'ed also invalidate 1233 * all current io 1234 */ 1235 printf("fdstart: disk changed\n"); 1236 #ifdef FDDEBUG 1237 printf(" disk was removed invalidating all io\n"); 1238 #endif 1239 sc->flags &= ~FDF_HAVELABEL; 1240 for (;;) { 1241 bp->b_flags |= B_ERROR; 1242 bp->b_error = EIO; 1243 if (bp->b_actf == NULL) 1244 break; 1245 biodone(bp); 1246 bp = bp->b_actf; 1247 } 1248 /* 1249 * do fddone() on last buf to allow other units to start. 1250 */ 1251 dp->b_actf = bp; 1252 fddone(sc); 1253 return; 1254 } 1255 1256 /* 1257 * we have a valid buf, setup our local version 1258 * we use this count to allow reading over multiple tracks. 1259 * into a single buffer 1260 */ 1261 dp->b_bcount = bp->b_bcount; 1262 dp->b_blkno = bp->b_blkno; 1263 dp->b_data = bp->b_data; 1264 dp->b_flags = bp->b_flags; 1265 dp->b_resid = 0; 1266 1267 if (bp->b_flags & B_READ) 1268 write = 0; 1269 else if (FDTESTC(FDB_PROTECT) == 0) 1270 write = 1; 1271 else { 1272 error = EPERM; 1273 goto bad; 1274 } 1275 1276 /* 1277 * figure trk given blkno 1278 */ 1279 trk = bp->b_blkno / sc->nsectors; 1280 1281 /* 1282 * check to see if same as currently cached track 1283 * if so we need to do no dma read. 1284 */ 1285 if (trk == sc->cachetrk) { 1286 fddone(sc); 1287 return; 1288 } 1289 1290 /* 1291 * if we will be overwriting the entire cache, don't bother to 1292 * fetch it. 1293 */ 1294 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1295 bp->b_blkno % sc->nsectors == 0) { 1296 if (sc->flags & FDF_DIRTY) 1297 sc->flags |= FDF_JUSTFLUSH; 1298 else { 1299 sc->cachetrk = trk; 1300 fddone(sc); 1301 return; 1302 } 1303 } 1304 1305 /* 1306 * start dma read of `trk' 1307 */ 1308 fddmastart(sc, trk); 1309 return; 1310 bad: 1311 bp->b_flags |= B_ERROR; 1312 bp->b_error = error; 1313 fddone(sc); 1314 } 1315 1316 /* 1317 * continue a started operation on next track. always begin at 1318 * sector 0 on the next track. 1319 */ 1320 void 1321 fdcont(sc) 1322 struct fd_softc *sc; 1323 { 1324 struct buf *dp, *bp; 1325 int trk, write; 1326 1327 dp = &sc->bufq; 1328 bp = dp->b_actf; 1329 dp->b_data += (dp->b_bcount - bp->b_resid); 1330 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1331 dp->b_bcount = bp->b_resid; 1332 1333 /* 1334 * figure trk given blkno 1335 */ 1336 trk = dp->b_blkno / sc->nsectors; 1337 #ifdef DEBUG 1338 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1339 panic("fdcont: confused"); 1340 #endif 1341 if (dp->b_flags & B_READ) 1342 write = 0; 1343 else 1344 write = 1; 1345 /* 1346 * if we will be overwriting the entire cache, don't bother to 1347 * fetch it. 1348 */ 1349 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1350 if (sc->flags & FDF_DIRTY) 1351 sc->flags |= FDF_JUSTFLUSH; 1352 else { 1353 sc->cachetrk = trk; 1354 fddone(sc); 1355 return; 1356 } 1357 } 1358 /* 1359 * start dma read of `trk' 1360 */ 1361 fddmastart(sc, trk); 1362 return; 1363 } 1364 1365 void 1366 fddmastart(sc, trk) 1367 struct fd_softc *sc; 1368 int trk; 1369 { 1370 int adkmask, ndmaw, write, dmatrk; 1371 1372 #ifdef FDDEBUG 1373 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1374 trk / FDNHEADS, trk % FDNHEADS); 1375 #endif 1376 /* 1377 * flush the cached track if dirty else read requested track. 1378 */ 1379 if (sc->flags & FDF_DIRTY) { 1380 fdcachetoraw(sc); 1381 ndmaw = sc->type->nwritew; 1382 dmatrk = sc->cachetrk; 1383 write = 1; 1384 } else { 1385 ndmaw = sc->type->nreadw; 1386 dmatrk = trk; 1387 write = 0; 1388 } 1389 1390 #ifdef FDDEBUG 1391 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1392 #endif 1393 sc->cachetrk = trk; 1394 fdc_indma = sc; 1395 fdsetpos(sc, dmatrk, write); 1396 1397 /* 1398 * setup dma stuff 1399 */ 1400 if (write == 0) { 1401 custom.adkcon = ADKF_MSBSYNC; 1402 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1403 custom.dsksync = FDMFMSYNC; 1404 } else { 1405 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1406 ADKF_MSBSYNC; 1407 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1408 if (dmatrk >= sc->type->precomp[0]) 1409 adkmask |= ADKF_PRECOMP0; 1410 if (dmatrk >= sc->type->precomp[1]) 1411 adkmask |= ADKF_PRECOMP1; 1412 custom.adkcon = adkmask; 1413 } 1414 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1415 1416 /* 1417 * If writing an MSDOS track, activate disk index pulse 1418 * interrupt, dma will be started in the intr routine fdidxintr() 1419 * Otherwise, start the DMA here. 1420 */ 1421 if (write && sc->openpart == FDMSDOSPART) { 1422 fdc_dmalen = ndmaw; 1423 fdc_dmawrite = write; 1424 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1425 } else { 1426 FDDMASTART(ndmaw, write); 1427 fdc_dmalen = 0; 1428 } 1429 1430 #ifdef FDDEBUG 1431 printf(" dma started\n"); 1432 #endif 1433 } 1434 1435 /* 1436 * recalibrate the drive 1437 */ 1438 void 1439 fdcalibrate(arg) 1440 void *arg; 1441 { 1442 struct fd_softc *sc; 1443 static int loopcnt; 1444 1445 sc = arg; 1446 1447 if (loopcnt == 0) { 1448 /* 1449 * seek cyl 0 1450 */ 1451 fdc_indma = sc; 1452 sc->stepdelay += 900; 1453 if (sc->cachetrk > 1) 1454 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1455 sc->stepdelay -= 900; 1456 } 1457 if (loopcnt++ & 1) 1458 fdsetpos(sc, sc->cachetrk, 0); 1459 else 1460 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1461 /* 1462 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1463 */ 1464 if (loopcnt < 8) 1465 timeout(fdcalibrate, sc, hz / 8); 1466 else { 1467 loopcnt = 0; 1468 fdc_indma = NULL; 1469 timeout(fdmotoroff, sc, 3 * hz / 2); 1470 fddmastart(sc, sc->cachetrk); 1471 } 1472 } 1473 1474 void 1475 fddmadone(sc, timeo) 1476 struct fd_softc *sc; 1477 int timeo; 1478 { 1479 #ifdef FDDEBUG 1480 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1481 #endif 1482 fdc_indma = NULL; 1483 untimeout(fdmotoroff, sc); 1484 FDDMASTOP; 1485 1486 /* 1487 * guarantee the drive has been at current head and cyl 1488 * for at least FDWRITEDELAY after a write. 1489 */ 1490 if (sc->flags & FDF_WRITEWAIT) { 1491 delay(FDWRITEDELAY); 1492 sc->flags &= ~FDF_WRITEWAIT; 1493 } 1494 1495 if ((sc->flags & FDF_MOTOROFF) == 0) { 1496 /* 1497 * motor runs for 1.5 seconds after last dma 1498 */ 1499 timeout(fdmotoroff, sc, 3 * hz / 2); 1500 } 1501 if (sc->flags & FDF_DIRTY) { 1502 /* 1503 * if buffer dirty, the last dma cleaned it 1504 */ 1505 sc->flags &= ~FDF_DIRTY; 1506 if (timeo) 1507 printf("%s: write of track cache timed out.\n", 1508 sc->sc_dv.dv_xname); 1509 if (sc->flags & FDF_JUSTFLUSH) { 1510 sc->flags &= ~FDF_JUSTFLUSH; 1511 /* 1512 * we are done dma'ing 1513 */ 1514 fddone(sc); 1515 return; 1516 } 1517 /* 1518 * load the cache 1519 */ 1520 fddmastart(sc, sc->cachetrk); 1521 return; 1522 } 1523 #ifdef FDDEBUG 1524 else if (sc->flags & FDF_MOTOROFF) 1525 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1526 #endif 1527 1528 /* 1529 * cache loaded decode it into cache buffer 1530 */ 1531 if (timeo == 0 && fdrawtocache(sc) == 0) 1532 sc->retried = 0; 1533 else { 1534 #ifdef FDDEBUG 1535 if (timeo) 1536 printf("%s: fddmadone: cache load timed out.\n", 1537 sc->sc_dv.dv_xname); 1538 #endif 1539 if (sc->retried >= sc->retries) { 1540 sc->retried = 0; 1541 sc->cachetrk = -1; 1542 } else { 1543 sc->retried++; 1544 /* 1545 * this will be restarted at end of calibrate loop. 1546 */ 1547 untimeout(fdmotoroff, sc); 1548 fdcalibrate(sc); 1549 return; 1550 } 1551 } 1552 fddone(sc); 1553 } 1554 1555 void 1556 fddone(sc) 1557 struct fd_softc *sc; 1558 { 1559 struct buf *dp, *bp; 1560 char *data; 1561 int sz; 1562 1563 #ifdef FDDEBUG 1564 printf("fddone: unit %d\n", sc->hwunit); 1565 #endif 1566 /* 1567 * check to see if unit is just flushing the cache, 1568 * that is we have no io queued. 1569 */ 1570 if (sc->flags & FDF_MOTOROFF) 1571 goto nobuf; 1572 1573 dp = &sc->bufq; 1574 if ((bp = dp->b_actf) == NULL) 1575 panic ("fddone"); 1576 /* 1577 * check for an error that may have occured 1578 * while getting the track. 1579 */ 1580 if (sc->cachetrk == -1) { 1581 sc->retried = 0; 1582 bp->b_flags |= B_ERROR; 1583 bp->b_error = EIO; 1584 } else if ((bp->b_flags & B_ERROR) == 0) { 1585 data = sc->cachep; 1586 /* 1587 * get offset of data in track cache and limit 1588 * the copy size to not exceed the cache's end. 1589 */ 1590 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1591 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1592 sz *= FDSECSIZE; 1593 sz = min(dp->b_bcount, sz); 1594 if (bp->b_flags & B_READ) 1595 bcopy(data, dp->b_data, sz); 1596 else { 1597 bcopy(dp->b_data, data, sz); 1598 sc->flags |= FDF_DIRTY; 1599 } 1600 bp->b_resid = dp->b_bcount - sz; 1601 if (bp->b_resid == 0) { 1602 bp->b_error = 0; 1603 } else { 1604 /* 1605 * not done yet need to read next track 1606 */ 1607 fdcont(sc); 1608 return; 1609 } 1610 } 1611 /* 1612 * remove from queue. 1613 */ 1614 dp->b_actf = bp->b_actf; 1615 1616 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1617 1618 biodone(bp); 1619 nobuf: 1620 fdfindwork(sc->sc_dv.dv_unit); 1621 } 1622 1623 void 1624 fdfindwork(unit) 1625 int unit; 1626 { 1627 struct fd_softc *ssc, *sc; 1628 int i, last; 1629 1630 /* 1631 * first see if we have any fdopen()'s waiting 1632 */ 1633 if (fdc_wantwakeup) { 1634 wakeup(fdopen); 1635 fdc_wantwakeup--; 1636 return; 1637 } 1638 1639 /* 1640 * start next available unit, linear search from the next unit 1641 * wrapping and finally this unit. 1642 */ 1643 last = 0; 1644 ssc = NULL; 1645 for (i = unit + 1; last == 0; i++) { 1646 if (i == unit) 1647 last = 1; 1648 if (i >= fd_cd.cd_ndevs) { 1649 i = -1; 1650 continue; 1651 } 1652 if ((sc = fd_cd.cd_devs[i]) == NULL) 1653 continue; 1654 1655 /* 1656 * if unit has requested to be turned off 1657 * and it has no buf's queued do it now 1658 */ 1659 if (sc->flags & FDF_MOTOROFF) { 1660 if (sc->bufq.b_actf == NULL) 1661 fdmotoroff(sc); 1662 else { 1663 /* 1664 * we gained a buf request while 1665 * we waited, forget the motoroff 1666 */ 1667 sc->flags &= ~FDF_MOTOROFF; 1668 } 1669 /* 1670 * if we now have dma unit must have needed 1671 * flushing, quit 1672 */ 1673 if (fdc_indma) 1674 return; 1675 } 1676 /* 1677 * if we have no start unit and the current unit has 1678 * io waiting choose this unit to start. 1679 */ 1680 if (ssc == NULL && sc->bufq.b_actf) 1681 ssc = sc; 1682 } 1683 if (ssc) 1684 fdstart(ssc); 1685 } 1686 1687 /* 1688 * min byte count to whats left of the track in question 1689 */ 1690 void 1691 fdminphys(bp) 1692 struct buf *bp; 1693 { 1694 struct fd_softc *sc; 1695 int trk, sec, toff, tsz; 1696 1697 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1698 panic("fdminphys: couldn't get softc"); 1699 1700 trk = bp->b_blkno / sc->nsectors; 1701 sec = bp->b_blkno % sc->nsectors; 1702 1703 toff = sec * FDSECSIZE; 1704 tsz = sc->nsectors * FDSECSIZE; 1705 #ifdef FDDEBUG 1706 printf("fdminphys: before %d", bp->b_bcount); 1707 #endif 1708 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1709 #ifdef FDDEBUG 1710 printf(" after %d\n", bp->b_bcount); 1711 #endif 1712 minphys(bp); 1713 } 1714 1715 /* 1716 * encode the track cache into raw MFM ready for dma 1717 * when we go to multiple disk formats, this will call type dependent 1718 * functions 1719 */ 1720 void fdcachetoraw(sc) 1721 struct fd_softc *sc; 1722 { 1723 if (sc->openpart == FDMSDOSPART) 1724 mscachetoraw(sc); 1725 else 1726 amcachetoraw(sc); 1727 } 1728 1729 /* 1730 * decode raw MFM from dma into units track cache. 1731 * when we go to multiple disk formats, this will call type dependent 1732 * functions 1733 */ 1734 int 1735 fdrawtocache(sc) 1736 struct fd_softc *sc; 1737 { 1738 1739 if (sc->openpart == FDMSDOSPART) 1740 return(msrawtocache(sc)); 1741 else 1742 return(amrawtocache(sc)); 1743 } 1744 1745 void 1746 amcachetoraw(sc) 1747 struct fd_softc *sc; 1748 { 1749 static u_long mfmnull[4]; 1750 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1751 int sec, i; 1752 1753 rp = fdc_dmap; 1754 1755 /* 1756 * not yet one sector (- 1 long) gap. 1757 * for now use previous drivers values 1758 */ 1759 for (i = 0; i < sc->type->gap; i++) 1760 *rp++ = 0xaaaaaaaa; 1761 /* 1762 * process sectors 1763 */ 1764 dp = sc->cachep; 1765 zero = 0; 1766 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1767 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1768 hcksum = dcksum = 0; 1769 /* 1770 * sector format 1771 * offset description 1772 *----------------------------------- 1773 * 0 null 1774 * 1 sync 1775 * oddbits evenbits 1776 *---------------------- 1777 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1778 * 4-7 8-11 null 1779 * 12 13 header cksum [2-11] 1780 * 14 15 data cksum [16-271] 1781 * 16-143 144-271 data 1782 */ 1783 *rp = 0xaaaaaaaa; 1784 if (*(rp - 1) & 0x1) 1785 *rp &= 0x7fffffff; /* clock bit correction */ 1786 rp++; 1787 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1788 rp = mfmblkencode(&info, rp, &hcksum, 1); 1789 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1790 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1791 1792 crp = rp; 1793 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1794 dp += FDSECLWORDS; 1795 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1796 if (*(crp - 1) & 0x1) 1797 *crp &= 0x7fffffff; /* clock bit correction */ 1798 else if ((*crp & 0x40000000) == 0) 1799 *crp |= 0x80000000; 1800 } 1801 *rp = 0xaaa80000; 1802 if (*(rp - 1) & 0x1) 1803 *rp &= 0x7fffffff; 1804 } 1805 1806 u_long * 1807 fdfindsync(rp, ep) 1808 u_long *rp, *ep; 1809 { 1810 u_short *sp; 1811 1812 sp = (u_short *)rp; 1813 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1814 sp++; 1815 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1816 sp++; 1817 if ((u_long *)sp < ep) 1818 return((u_long *)sp); 1819 return(NULL); 1820 } 1821 1822 int 1823 amrawtocache(sc) 1824 struct fd_softc *sc; 1825 { 1826 u_long mfmnull[4]; 1827 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1828 int cnt, doagain; 1829 1830 doagain = 1; 1831 srp = rp = fdc_dmap; 1832 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1833 cnt = 0; 1834 again: 1835 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1836 #ifdef DIAGNOSTIC 1837 printf("%s: corrupted track (%d) data.\n", 1838 sc->sc_dv.dv_xname, sc->cachetrk); 1839 #endif 1840 return(-1); 1841 } 1842 1843 /* 1844 * process sectors 1845 */ 1846 for (; cnt < sc->nsectors; cnt++) { 1847 hcksum = dcksum = 0; 1848 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1849 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1850 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1851 if (cktmp != hcksum) { 1852 #ifdef FDDEBUG 1853 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1854 info, hcksum, cktmp); 1855 #endif 1856 goto again; 1857 } 1858 if (((info >> 16) & 0xff) != sc->cachetrk) { 1859 #ifdef DEBUG 1860 printf("%s: incorrect track found: 0x%lx %d\n", 1861 sc->sc_dv.dv_xname, info, sc->cachetrk); 1862 #endif 1863 goto again; 1864 } 1865 #ifdef FDDEBUG 1866 printf(" info 0x%x\n", info); 1867 #endif 1868 1869 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1870 dp = sc->cachep; 1871 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1872 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1873 if (cktmp != dcksum) { 1874 #ifdef FDDEBUG 1875 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1876 info, dcksum, cktmp); 1877 #endif 1878 goto again; 1879 } 1880 1881 /* 1882 * if we are at gap then we can no longer be sure 1883 * of correct sync marks 1884 */ 1885 if ((info && 0xff) == 1) 1886 doagain = 1; 1887 else 1888 doagain = 0; 1889 srp = rp = fdfindsync(crp, erp); 1890 } 1891 return(0); 1892 } 1893 1894 void 1895 mscachetoraw(sc) 1896 struct fd_softc *sc; 1897 { 1898 u_short *rp, *erp, crc; 1899 u_char *cp, tb[5]; 1900 int sec, i; 1901 1902 rp = (u_short *)fdc_dmap; 1903 erp = rp + sc->type->nwritew; 1904 cp = sc->cachep; 1905 1906 /* 1907 * initial track filler (828 * GAP1) 1908 */ 1909 for (i = 0; i < sc->type->gap; i++) { 1910 *rp++ = FDMFMGAP1; 1911 *rp++ = FDMFMGAP1; 1912 } 1913 1914 for (sec = 0; sec < sc->nsectors; sec++) { 1915 1916 /* 1917 * leading sector gap 1918 * (12 * GAP2) + (3 * SYNC) 1919 */ 1920 for (i = 0; i < 12; i++) 1921 *rp++ = FDMFMGAP2; 1922 *rp++ = FDMFMSYNC; 1923 *rp++ = FDMFMSYNC; 1924 *rp++ = FDMFMSYNC; 1925 1926 /* 1927 * sector information 1928 * (ID) + track + side + sector + sector size + CRC16 1929 */ 1930 *rp++ = FDMFMID; 1931 tb[0] = sc->cachetrk / FDNHEADS; 1932 tb[1] = sc->cachetrk % FDNHEADS; 1933 tb[2] = sec + 1; 1934 i = sc->bytespersec; 1935 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1936 rp = msblkencode(rp, tb, 4, &crc); 1937 tb[0] = crc >> 8; 1938 tb[1] = crc & 0xff; 1939 tb[2] = 0x4e; /* GAP1 decoded */ 1940 rp = msblkencode(rp, tb, 3, 0); 1941 1942 /* 1943 * sector info/data gap 1944 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1945 */ 1946 for (i = 0; i < 21; i++) 1947 *rp++ = FDMFMGAP1; 1948 for (i = 0; i < 12; i++) 1949 *rp++ = FDMFMGAP2; 1950 *rp++ = FDMFMSYNC; 1951 *rp++ = FDMFMSYNC; 1952 *rp++ = FDMFMSYNC; 1953 1954 /* 1955 * sector data 1956 * (DATA) + ...data... + CRC16 1957 */ 1958 *rp++ = FDMFMDATA; 1959 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1960 cp += sc->bytespersec; 1961 tb[0] = crc >> 8; 1962 tb[1] = crc & 0xff; 1963 tb[2] = 0x4e; /* GAP3 decoded */ 1964 rp = msblkencode(rp, tb, 3, 0); 1965 1966 /* 1967 * trailing sector gap 1968 * (80 * GAP3) 1969 */ 1970 for (i = 0; i < 79; i++) 1971 *rp++ = FDMFMGAP3; 1972 } 1973 1974 /* 1975 * fill rest of track with GAP3 1976 */ 1977 while (rp != erp) 1978 *rp++ = FDMFMGAP3; 1979 1980 } 1981 1982 int 1983 msrawtocache(sc) 1984 struct fd_softc *sc; 1985 { 1986 u_short *rp, *srp, *erp; 1987 u_char tb[5], *cp; 1988 int ct, sec, retry; 1989 1990 srp = rp = (u_short *)fdc_dmap; 1991 erp = rp + sc->type->nreadw; 1992 cp = sc->cachep; 1993 1994 for (ct = 0; ct < sc->nsectors; ct++) { 1995 retry = 1; 1996 do { 1997 /* 1998 * skip leading gap to sync 1999 */ 2000 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 2001 #ifdef DIAGNOSTIC 2002 printf("%s: corrupted track (%d) data.\n", 2003 sc->sc_dv.dv_xname, sc->cachetrk); 2004 #endif 2005 return(-1); 2006 } 2007 2008 /* 2009 * Grab sector info 2010 */ 2011 if (*rp++ != FDMFMID) 2012 continue; 2013 rp = msblkdecode(rp, tb, 4); 2014 #ifdef FDDEBUG 2015 printf("sector id: sector %d, track %d, side %d," 2016 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 2017 #endif 2018 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 2019 tb[2] > sc->nsectors) 2020 continue; 2021 2022 sec = tb[2]; 2023 sc->bytespersec = 128 << tb[3]; 2024 rp += 2; /* skip CRC-16 */ 2025 2026 /* 2027 * skip gap and read in data 2028 */ 2029 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 2030 return(-1); 2031 if (*rp++ != FDMFMDATA) 2032 continue; 2033 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 2034 sc->bytespersec); 2035 rp += 2; /* skip CRC-16 */ 2036 2037 retry = 0; 2038 } while (retry); 2039 } 2040 return(0); 2041 } 2042 2043 /* 2044 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2045 * this format specified that the odd bits are at current pos and even 2046 * bits at len + current pos 2047 */ 2048 u_long * 2049 mfmblkencode(dp, rp, cp, len) 2050 u_long *dp, *rp, *cp; 2051 int len; 2052 { 2053 u_long *sdp, *edp, d, dtmp, correct; 2054 2055 sdp = dp; 2056 edp = dp + len; 2057 2058 if (*(rp - 1) & 0x1) 2059 correct = 1; 2060 else 2061 correct = 0; 2062 /* 2063 * do odd bits 2064 */ 2065 while (dp < edp) { 2066 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2067 dtmp = d ^ 0x55555555; 2068 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2069 /* 2070 * correct upper clock bit if needed 2071 */ 2072 if (correct) 2073 d &= 0x7fffffff; 2074 if (d & 0x1) 2075 correct = 1; 2076 else 2077 correct = 0; 2078 /* 2079 * do checksums and store in raw buffer 2080 */ 2081 if (cp) 2082 *cp ^= d; 2083 *rp++ = d; 2084 dp++; 2085 } 2086 /* 2087 * do even bits 2088 */ 2089 dp = sdp; 2090 while (dp < edp) { 2091 d = *dp & 0x55555555; /* remove clock bits */ 2092 dtmp = d ^ 0x55555555; 2093 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2094 /* 2095 * correct upper clock bit if needed 2096 */ 2097 if (correct) 2098 d &= 0x7fffffff; 2099 if (d & 0x1) 2100 correct = 1; 2101 else 2102 correct = 0; 2103 /* 2104 * do checksums and store in raw buffer 2105 */ 2106 if (cp) 2107 *cp ^= d; 2108 *rp++ = d; 2109 dp++; 2110 } 2111 if (cp) 2112 *cp &= 0x55555555; 2113 return(rp); 2114 } 2115 2116 /* 2117 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2118 * this format specified that the odd bits are at current pos and even 2119 * bits at len + current pos 2120 */ 2121 u_long * 2122 mfmblkdecode(rp, dp, cp, len) 2123 u_long *rp, *dp, *cp; 2124 int len; 2125 { 2126 u_long o, e; 2127 int cnt; 2128 2129 cnt = len; 2130 while (cnt--) { 2131 o = *rp; 2132 e = *(rp + len); 2133 if (cp) { 2134 *cp ^= o; 2135 *cp ^= e; 2136 } 2137 o &= 0x55555555; 2138 e &= 0x55555555; 2139 *dp++ = (o << 1) | e; 2140 rp++; 2141 } 2142 if (cp) 2143 *cp &= 0x55555555; 2144 return(rp + len); 2145 } 2146 2147 /* 2148 * decode len words in standard MFM format to len bytes 2149 * of data. 2150 */ 2151 u_short * 2152 msblkdecode(rp, cp, len) 2153 u_short *rp; 2154 u_char *cp; 2155 int len; 2156 { 2157 while (len--) { 2158 *cp++ = msdecode[*rp & 0x7f] | 2159 (msdecode[(*rp >> 8) & 0x7f] << 4); 2160 rp++; 2161 } 2162 2163 return(rp); 2164 } 2165 2166 /* 2167 * encode len bytes of data into len words in standard MFM format. 2168 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2169 * as well. 2170 */ 2171 u_short * 2172 msblkencode(rp, cp, len, crc) 2173 u_short *rp; 2174 u_char *cp; 2175 int len; 2176 u_short *crc; 2177 { 2178 u_short td; 2179 u_short mycrc; 2180 2181 /* preload crc for header (4 bytes) 2182 * or data (anything else) 2183 */ 2184 mycrc = (len == 4) ? 0xb230 : 0xe295; 2185 2186 while (len--) { 2187 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2188 2189 /* Check for zeros in top bit of encode and bottom 2190 * bit of previous encode. if so, slap a one in betweem 2191 * them. 2192 */ 2193 if ((td & 0x140) == 0) 2194 td |= 0x80; 2195 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2196 td |= 0x8000; 2197 2198 *rp++ = td; 2199 2200 /* 2201 * calc crc if requested 2202 */ 2203 if (crc) 2204 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2205 2206 cp++; 2207 } 2208 2209 if (crc) 2210 *crc = mycrc; 2211 2212 return(rp); 2213 } 2214 2215 int 2216 fddump(dev, blkno, va, size) 2217 dev_t dev; 2218 daddr_t blkno; 2219 caddr_t va; 2220 size_t size; 2221 { 2222 return (EINVAL); 2223 } 2224
Indexes created Thu Oct 02 14:10:14 GMT 2025