1 /* $NetBSD: fd.c,v 1.40 1998/01/12 10:39:26 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 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 bp->b_dev = dev; 815 bp->b_blkno = 0; 816 bp->b_cylin = 0; 817 bp->b_bcount = FDSECSIZE; 818 bp->b_flags = B_BUSY | B_READ; 819 fdstrategy(bp); 820 if ((error = biowait(bp)) != 0) 821 goto nolabel; 822 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 823 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 824 dkcksum(dlp)) { 825 error = EINVAL; 826 goto nolabel; 827 } 828 bcopy(dlp, lp, sizeof(struct disklabel)); 829 if (lp->d_trkseek > FDSTEPDELAY) 830 sc->stepdelay = lp->d_trkseek; 831 brelse(bp); 832 return(0); 833 nolabel: 834 fdgetdefaultlabel(sc, lp, part); 835 brelse(bp); 836 return(0); 837 } 838 839 /* 840 * set the incore copy of this units disklabel 841 */ 842 int 843 fdsetdisklabel(sc, lp) 844 struct fd_softc *sc; 845 struct disklabel *lp; 846 { 847 struct disklabel *clp; 848 struct partition *pp; 849 850 /* 851 * must have at least opened raw unit to fetch the 852 * raw_part stuff. 853 */ 854 if ((sc->flags & FDF_HAVELABEL) == 0) 855 return(EINVAL); 856 clp = sc->dkdev.dk_label; 857 /* 858 * make sure things check out and we only have one valid 859 * partition 860 */ 861 #ifdef FDDEBUG 862 printf("fdsetdisklabel\n"); 863 #endif 864 if (lp->d_secsize != FDSECSIZE || 865 lp->d_nsectors != clp->d_nsectors || 866 lp->d_ntracks != FDNHEADS || 867 lp->d_ncylinders != clp->d_ncylinders || 868 lp->d_secpercyl != clp->d_secpercyl || 869 lp->d_secperunit != clp->d_secperunit || 870 lp->d_magic != DISKMAGIC || 871 lp->d_magic2 != DISKMAGIC || 872 lp->d_npartitions == 0 || 873 lp->d_npartitions > FDMAXPARTS || 874 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 875 dkcksum(lp)) 876 return(EINVAL); 877 /* 878 * if any partitions are present make sure they 879 * represent the currently open type 880 */ 881 if ((pp = &lp->d_partitions[0])->p_size) { 882 if ((pp = &lp->d_partitions[1])->p_size == 0) 883 goto done; 884 else if (sc->openpart != 1) 885 return(EINVAL); 886 } else if (sc->openpart != 0) 887 return(EINVAL); 888 /* 889 * make sure selected partition is within bounds 890 * XXX on the second check, its to handle a bug in 891 * XXX the cluster routines as they require mutliples 892 * XXX of CLBYTES currently 893 */ 894 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 895 (pp->p_frag * pp->p_fsize % CLBYTES)) 896 return(EINVAL); 897 done: 898 bcopy(lp, clp, sizeof(struct disklabel)); 899 return(0); 900 } 901 902 /* 903 * write out the incore copy of this units disklabel 904 */ 905 int 906 fdputdisklabel(sc, dev) 907 struct fd_softc *sc; 908 dev_t dev; 909 { 910 struct disklabel *lp, *dlp; 911 struct buf *bp; 912 int error; 913 914 if ((sc->flags & FDF_HAVELABEL) == 0) 915 return(EBADF); 916 #ifdef FDDEBUG 917 printf("fdputdisklabel\n"); 918 #endif 919 /* 920 * get buf and read in sector 0 921 */ 922 lp = sc->dkdev.dk_label; 923 bp = (void *)geteblk((int)lp->d_secsize); 924 bp->b_dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 925 bp->b_blkno = 0; 926 bp->b_cylin = 0; 927 bp->b_bcount = FDSECSIZE; 928 bp->b_flags = B_BUSY | B_READ; 929 fdstrategy(bp); 930 if ((error = biowait(bp)) != 0) 931 goto done; 932 /* 933 * copy disklabel to buf and write it out syncronous 934 */ 935 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 936 bcopy(lp, dlp, sizeof(struct disklabel)); 937 bp->b_blkno = 0; 938 bp->b_cylin = 0; 939 bp->b_flags = B_WRITE; 940 fdstrategy(bp); 941 error = biowait(bp); 942 done: 943 brelse(bp); 944 return(error); 945 } 946 947 /* 948 * figure out drive type or NULL if none. 949 */ 950 struct fdtype * 951 fdcgetfdtype(unit) 952 int unit; 953 { 954 struct fdtype *ftp; 955 u_long id, idb; 956 int cnt, umask; 957 958 id = 0; 959 umask = 1 << (3 + unit); 960 961 FDDESELECT(FDCUNITMASK); 962 963 FDSETMOTOR(1); 964 delay(1); 965 FDSELECT(umask); 966 delay(1); 967 FDDESELECT(umask); 968 969 FDSETMOTOR(0); 970 delay(1); 971 FDSELECT(umask); 972 delay(1); 973 FDDESELECT(umask); 974 975 for (idb = 0x80000000; idb; idb >>= 1) { 976 FDSELECT(umask); 977 delay(1); 978 if (FDTESTC(FDB_READY) == 0) 979 id |= idb; 980 FDDESELECT(umask); 981 delay(1); 982 } 983 #ifdef FDDEBUG 984 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 985 #endif 986 987 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 988 if (ftp->driveid == id) 989 return(ftp); 990 /* 991 * 3.5dd's at unit 0 do not always return id. 992 */ 993 if (unit == 0) 994 return(fdtype); 995 return(NULL); 996 } 997 998 /* 999 * turn motor off if possible otherwise mark as needed and will be done 1000 * later. 1001 */ 1002 void 1003 fdmotoroff(arg) 1004 void *arg; 1005 { 1006 struct fd_softc *sc; 1007 int s; 1008 1009 sc = arg; 1010 s = splbio(); 1011 1012 #ifdef FDDEBUG 1013 printf("fdmotoroff: unit %d\n", sc->hwunit); 1014 #endif 1015 if ((sc->flags & FDF_MOTORON) == 0) 1016 goto done; 1017 /* 1018 * if we have a timeout on a dma operation let fddmadone() 1019 * deal with it. 1020 */ 1021 if (fdc_indma == sc) { 1022 fddmadone(sc, 1); 1023 goto done; 1024 } 1025 #ifdef FDDEBUG 1026 printf(" motor was on, turning off\n"); 1027 #endif 1028 1029 /* 1030 * flush cache if needed 1031 */ 1032 if (sc->flags & FDF_DIRTY) { 1033 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1034 #ifdef FDDEBUG 1035 printf(" flushing dirty buffer first\n"); 1036 #endif 1037 /* 1038 * if dma'ing done for now, fddone() will call us again 1039 */ 1040 if (fdc_indma) 1041 goto done; 1042 fddmastart(sc, sc->cachetrk); 1043 goto done; 1044 } 1045 1046 /* 1047 * if controller is busy just schedule us to be called back 1048 */ 1049 if (fdc_indma) { 1050 /* 1051 * someone else has the controller now 1052 * just set flag and let fddone() call us again. 1053 */ 1054 sc->flags |= FDF_MOTOROFF; 1055 goto done; 1056 } 1057 1058 #ifdef FDDEBUG 1059 printf(" hw turning unit off\n"); 1060 #endif 1061 1062 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1063 FDDESELECT(FDCUNITMASK); 1064 FDSETMOTOR(0); 1065 delay(1); 1066 FDSELECT(sc->unitmask); 1067 delay(4); 1068 FDDESELECT(sc->unitmask); 1069 delay(1); 1070 if (sc->flags & FDF_WMOTOROFF) 1071 wakeup(fdmotoroff); 1072 done: 1073 splx(s); 1074 } 1075 1076 /* 1077 * select drive seek to track exit with motor on. 1078 * fdsetpos(x, 0, 0) does calibrates the drive. 1079 */ 1080 void 1081 fdsetpos(sc, trk, towrite) 1082 struct fd_softc *sc; 1083 int trk, towrite; 1084 { 1085 int nstep, sdir, ondly, ncyl, nside; 1086 1087 FDDESELECT(FDCUNITMASK); 1088 FDSETMOTOR(1); 1089 delay(1); 1090 FDSELECT(sc->unitmask); 1091 delay(1); 1092 if ((sc->flags & FDF_MOTORON) == 0) { 1093 ondly = 0; 1094 while (FDTESTC(FDB_READY) == 0) { 1095 delay(1000); 1096 if (++ondly >= 1000) 1097 break; 1098 } 1099 } 1100 sc->flags |= FDF_MOTORON; 1101 1102 ncyl = trk / FDNHEADS; 1103 nside = trk % FDNHEADS; 1104 1105 if (sc->curcyl == ncyl && fdc_side == nside) 1106 return; 1107 1108 if (towrite) 1109 sc->flags |= FDF_WRITEWAIT; 1110 1111 #ifdef FDDEBUG 1112 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1113 trk % FDNHEADS, towrite); 1114 #endif 1115 nstep = ncyl - sc->curcyl; 1116 if (nstep) { 1117 /* 1118 * figure direction 1119 */ 1120 if (nstep > 0 && ncyl != 0) { 1121 sdir = FDSTEPIN; 1122 FDSETDIR(1); 1123 } else { 1124 nstep = -nstep; 1125 sdir = FDSTEPOUT; 1126 FDSETDIR(0); 1127 } 1128 if (ncyl == 0) { 1129 /* 1130 * either just want cylinder 0 or doing 1131 * a calibrate. 1132 */ 1133 nstep = 256; 1134 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1135 FDSTEP; 1136 delay(sc->stepdelay); 1137 } 1138 if (nstep < 0) 1139 sc->flags |= FDF_NOTRACK0; 1140 } else { 1141 /* 1142 * step the needed amount amount. 1143 */ 1144 while (nstep--) { 1145 FDSTEP; 1146 delay(sc->stepdelay); 1147 } 1148 } 1149 /* 1150 * if switched directions 1151 * allow drive to settle. 1152 */ 1153 if (sc->pstepdir != sdir) 1154 delay(FDSETTLEDELAY); 1155 sc->pstepdir = sdir; 1156 sc->curcyl = ncyl; 1157 } 1158 if (nside == fdc_side) 1159 return; 1160 /* 1161 * select side 1162 */ 1163 fdc_side = nside; 1164 FDSETHEAD(nside); 1165 delay(FDPRESIDEDELAY); 1166 } 1167 1168 void 1169 fdselunit(sc) 1170 struct fd_softc *sc; 1171 { 1172 FDDESELECT(FDCUNITMASK); /* deselect all */ 1173 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1174 delay(1); 1175 FDSELECT(sc->unitmask); /* select unit */ 1176 delay(1); 1177 } 1178 1179 /* 1180 * process next buf on device queue. 1181 * normall sequence of events: 1182 * fdstart() -> fddmastart(); 1183 * fdidxintr(); 1184 * fdintr() -> fddmadone() -> fddone(); 1185 * if the track is in the cache then fdstart() will short-circuit 1186 * to fddone() else if the track cache is dirty it will flush. If 1187 * the buf is not an entire track it will cache the requested track. 1188 */ 1189 void 1190 fdstart(sc) 1191 struct fd_softc *sc; 1192 { 1193 int trk, error, write; 1194 struct buf *bp, *dp; 1195 int changed; 1196 1197 #ifdef FDDEBUG 1198 printf("fdstart: unit %d\n", sc->hwunit); 1199 #endif 1200 1201 /* 1202 * if dma'ing just return. we must have been called from fdstartegy. 1203 */ 1204 if (fdc_indma) 1205 return; 1206 1207 /* 1208 * get next buf if there. 1209 */ 1210 dp = &sc->bufq; 1211 if ((bp = dp->b_actf) == NULL) { 1212 #ifdef FDDEBUG 1213 printf(" nothing to do\n"); 1214 #endif 1215 return; 1216 } 1217 1218 /* 1219 * Mark us as busy now, in case fddone() gets called in one 1220 * of the cases below. 1221 */ 1222 disk_busy(&sc->dkdev); 1223 1224 /* 1225 * make sure same disk is loaded 1226 */ 1227 fdselunit(sc); 1228 changed = FDTESTC(FDB_CHANGED); 1229 FDDESELECT(sc->unitmask); 1230 if (changed) { 1231 /* 1232 * disk missing, invalidate all future io on 1233 * this unit until re-open()'ed also invalidate 1234 * all current io 1235 */ 1236 printf("fdstart: disk changed\n"); 1237 #ifdef FDDEBUG 1238 printf(" disk was removed invalidating all io\n"); 1239 #endif 1240 sc->flags &= ~FDF_HAVELABEL; 1241 for (;;) { 1242 bp->b_flags |= B_ERROR; 1243 bp->b_error = EIO; 1244 if (bp->b_actf == NULL) 1245 break; 1246 biodone(bp); 1247 bp = bp->b_actf; 1248 } 1249 /* 1250 * do fddone() on last buf to allow other units to start. 1251 */ 1252 dp->b_actf = bp; 1253 fddone(sc); 1254 return; 1255 } 1256 1257 /* 1258 * we have a valid buf, setup our local version 1259 * we use this count to allow reading over multiple tracks. 1260 * into a single buffer 1261 */ 1262 dp->b_bcount = bp->b_bcount; 1263 dp->b_blkno = bp->b_blkno; 1264 dp->b_data = bp->b_data; 1265 dp->b_flags = bp->b_flags; 1266 dp->b_resid = 0; 1267 1268 if (bp->b_flags & B_READ) 1269 write = 0; 1270 else if (FDTESTC(FDB_PROTECT) == 0) 1271 write = 1; 1272 else { 1273 error = EPERM; 1274 goto bad; 1275 } 1276 1277 /* 1278 * figure trk given blkno 1279 */ 1280 trk = bp->b_blkno / sc->nsectors; 1281 1282 /* 1283 * check to see if same as currently cached track 1284 * if so we need to do no dma read. 1285 */ 1286 if (trk == sc->cachetrk) { 1287 fddone(sc); 1288 return; 1289 } 1290 1291 /* 1292 * if we will be overwriting the entire cache, don't bother to 1293 * fetch it. 1294 */ 1295 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1296 bp->b_blkno % sc->nsectors == 0) { 1297 if (sc->flags & FDF_DIRTY) 1298 sc->flags |= FDF_JUSTFLUSH; 1299 else { 1300 sc->cachetrk = trk; 1301 fddone(sc); 1302 return; 1303 } 1304 } 1305 1306 /* 1307 * start dma read of `trk' 1308 */ 1309 fddmastart(sc, trk); 1310 return; 1311 bad: 1312 bp->b_flags |= B_ERROR; 1313 bp->b_error = error; 1314 fddone(sc); 1315 } 1316 1317 /* 1318 * continue a started operation on next track. always begin at 1319 * sector 0 on the next track. 1320 */ 1321 void 1322 fdcont(sc) 1323 struct fd_softc *sc; 1324 { 1325 struct buf *dp, *bp; 1326 int trk, write; 1327 1328 dp = &sc->bufq; 1329 bp = dp->b_actf; 1330 dp->b_data += (dp->b_bcount - bp->b_resid); 1331 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1332 dp->b_bcount = bp->b_resid; 1333 1334 /* 1335 * figure trk given blkno 1336 */ 1337 trk = dp->b_blkno / sc->nsectors; 1338 #ifdef DEBUG 1339 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1340 panic("fdcont: confused"); 1341 #endif 1342 if (dp->b_flags & B_READ) 1343 write = 0; 1344 else 1345 write = 1; 1346 /* 1347 * if we will be overwriting the entire cache, don't bother to 1348 * fetch it. 1349 */ 1350 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1351 if (sc->flags & FDF_DIRTY) 1352 sc->flags |= FDF_JUSTFLUSH; 1353 else { 1354 sc->cachetrk = trk; 1355 fddone(sc); 1356 return; 1357 } 1358 } 1359 /* 1360 * start dma read of `trk' 1361 */ 1362 fddmastart(sc, trk); 1363 return; 1364 } 1365 1366 void 1367 fddmastart(sc, trk) 1368 struct fd_softc *sc; 1369 int trk; 1370 { 1371 int adkmask, ndmaw, write, dmatrk; 1372 1373 #ifdef FDDEBUG 1374 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1375 trk / FDNHEADS, trk % FDNHEADS); 1376 #endif 1377 /* 1378 * flush the cached track if dirty else read requested track. 1379 */ 1380 if (sc->flags & FDF_DIRTY) { 1381 fdcachetoraw(sc); 1382 ndmaw = sc->type->nwritew; 1383 dmatrk = sc->cachetrk; 1384 write = 1; 1385 } else { 1386 ndmaw = sc->type->nreadw; 1387 dmatrk = trk; 1388 write = 0; 1389 } 1390 1391 #ifdef FDDEBUG 1392 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1393 #endif 1394 sc->cachetrk = trk; 1395 fdc_indma = sc; 1396 fdsetpos(sc, dmatrk, write); 1397 1398 /* 1399 * setup dma stuff 1400 */ 1401 if (write == 0) { 1402 custom.adkcon = ADKF_MSBSYNC; 1403 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1404 custom.dsksync = FDMFMSYNC; 1405 } else { 1406 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1407 ADKF_MSBSYNC; 1408 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1409 if (dmatrk >= sc->type->precomp[0]) 1410 adkmask |= ADKF_PRECOMP0; 1411 if (dmatrk >= sc->type->precomp[1]) 1412 adkmask |= ADKF_PRECOMP1; 1413 custom.adkcon = adkmask; 1414 } 1415 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1416 1417 /* 1418 * If writing an MSDOS track, activate disk index pulse 1419 * interrupt, dma will be started in the intr routine fdidxintr() 1420 * Otherwise, start the DMA here. 1421 */ 1422 if (write && sc->openpart == FDMSDOSPART) { 1423 fdc_dmalen = ndmaw; 1424 fdc_dmawrite = write; 1425 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1426 } else { 1427 FDDMASTART(ndmaw, write); 1428 fdc_dmalen = 0; 1429 } 1430 1431 #ifdef FDDEBUG 1432 printf(" dma started\n"); 1433 #endif 1434 } 1435 1436 /* 1437 * recalibrate the drive 1438 */ 1439 void 1440 fdcalibrate(arg) 1441 void *arg; 1442 { 1443 struct fd_softc *sc; 1444 static int loopcnt; 1445 1446 sc = arg; 1447 1448 if (loopcnt == 0) { 1449 /* 1450 * seek cyl 0 1451 */ 1452 fdc_indma = sc; 1453 sc->stepdelay += 900; 1454 if (sc->cachetrk > 1) 1455 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1456 sc->stepdelay -= 900; 1457 } 1458 if (loopcnt++ & 1) 1459 fdsetpos(sc, sc->cachetrk, 0); 1460 else 1461 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1462 /* 1463 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1464 */ 1465 if (loopcnt < 8) 1466 timeout(fdcalibrate, sc, hz / 8); 1467 else { 1468 loopcnt = 0; 1469 fdc_indma = NULL; 1470 timeout(fdmotoroff, sc, 3 * hz / 2); 1471 fddmastart(sc, sc->cachetrk); 1472 } 1473 } 1474 1475 void 1476 fddmadone(sc, timeo) 1477 struct fd_softc *sc; 1478 int timeo; 1479 { 1480 #ifdef FDDEBUG 1481 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1482 #endif 1483 fdc_indma = NULL; 1484 untimeout(fdmotoroff, sc); 1485 FDDMASTOP; 1486 1487 /* 1488 * guarantee the drive has been at current head and cyl 1489 * for at least FDWRITEDELAY after a write. 1490 */ 1491 if (sc->flags & FDF_WRITEWAIT) { 1492 delay(FDWRITEDELAY); 1493 sc->flags &= ~FDF_WRITEWAIT; 1494 } 1495 1496 if ((sc->flags & FDF_MOTOROFF) == 0) { 1497 /* 1498 * motor runs for 1.5 seconds after last dma 1499 */ 1500 timeout(fdmotoroff, sc, 3 * hz / 2); 1501 } 1502 if (sc->flags & FDF_DIRTY) { 1503 /* 1504 * if buffer dirty, the last dma cleaned it 1505 */ 1506 sc->flags &= ~FDF_DIRTY; 1507 if (timeo) 1508 printf("%s: write of track cache timed out.\n", 1509 sc->sc_dv.dv_xname); 1510 if (sc->flags & FDF_JUSTFLUSH) { 1511 sc->flags &= ~FDF_JUSTFLUSH; 1512 /* 1513 * we are done dma'ing 1514 */ 1515 fddone(sc); 1516 return; 1517 } 1518 /* 1519 * load the cache 1520 */ 1521 fddmastart(sc, sc->cachetrk); 1522 return; 1523 } 1524 #ifdef FDDEBUG 1525 else if (sc->flags & FDF_MOTOROFF) 1526 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1527 #endif 1528 1529 /* 1530 * cache loaded decode it into cache buffer 1531 */ 1532 if (timeo == 0 && fdrawtocache(sc) == 0) 1533 sc->retried = 0; 1534 else { 1535 #ifdef FDDEBUG 1536 if (timeo) 1537 printf("%s: fddmadone: cache load timed out.\n", 1538 sc->sc_dv.dv_xname); 1539 #endif 1540 if (sc->retried >= sc->retries) { 1541 sc->retried = 0; 1542 sc->cachetrk = -1; 1543 } else { 1544 sc->retried++; 1545 /* 1546 * this will be restarted at end of calibrate loop. 1547 */ 1548 untimeout(fdmotoroff, sc); 1549 fdcalibrate(sc); 1550 return; 1551 } 1552 } 1553 fddone(sc); 1554 } 1555 1556 void 1557 fddone(sc) 1558 struct fd_softc *sc; 1559 { 1560 struct buf *dp, *bp; 1561 char *data; 1562 int sz; 1563 1564 #ifdef FDDEBUG 1565 printf("fddone: unit %d\n", sc->hwunit); 1566 #endif 1567 /* 1568 * check to see if unit is just flushing the cache, 1569 * that is we have no io queued. 1570 */ 1571 if (sc->flags & FDF_MOTOROFF) 1572 goto nobuf; 1573 1574 dp = &sc->bufq; 1575 if ((bp = dp->b_actf) == NULL) 1576 panic ("fddone"); 1577 /* 1578 * check for an error that may have occured 1579 * while getting the track. 1580 */ 1581 if (sc->cachetrk == -1) { 1582 sc->retried = 0; 1583 bp->b_flags |= B_ERROR; 1584 bp->b_error = EIO; 1585 } else if ((bp->b_flags & B_ERROR) == 0) { 1586 data = sc->cachep; 1587 /* 1588 * get offset of data in track cache and limit 1589 * the copy size to not exceed the cache's end. 1590 */ 1591 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1592 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1593 sz *= FDSECSIZE; 1594 sz = min(dp->b_bcount, sz); 1595 if (bp->b_flags & B_READ) 1596 bcopy(data, dp->b_data, sz); 1597 else { 1598 bcopy(dp->b_data, data, sz); 1599 sc->flags |= FDF_DIRTY; 1600 } 1601 bp->b_resid = dp->b_bcount - sz; 1602 if (bp->b_resid == 0) { 1603 bp->b_error = 0; 1604 } else { 1605 /* 1606 * not done yet need to read next track 1607 */ 1608 fdcont(sc); 1609 return; 1610 } 1611 } 1612 /* 1613 * remove from queue. 1614 */ 1615 dp->b_actf = bp->b_actf; 1616 1617 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1618 1619 biodone(bp); 1620 nobuf: 1621 fdfindwork(sc->sc_dv.dv_unit); 1622 } 1623 1624 void 1625 fdfindwork(unit) 1626 int unit; 1627 { 1628 struct fd_softc *ssc, *sc; 1629 int i, last; 1630 1631 /* 1632 * first see if we have any fdopen()'s waiting 1633 */ 1634 if (fdc_wantwakeup) { 1635 wakeup(fdopen); 1636 fdc_wantwakeup--; 1637 return; 1638 } 1639 1640 /* 1641 * start next available unit, linear search from the next unit 1642 * wrapping and finally this unit. 1643 */ 1644 last = 0; 1645 ssc = NULL; 1646 for (i = unit + 1; last == 0; i++) { 1647 if (i == unit) 1648 last = 1; 1649 if (i >= fd_cd.cd_ndevs) { 1650 i = -1; 1651 continue; 1652 } 1653 if ((sc = fd_cd.cd_devs[i]) == NULL) 1654 continue; 1655 1656 /* 1657 * if unit has requested to be turned off 1658 * and it has no buf's queued do it now 1659 */ 1660 if (sc->flags & FDF_MOTOROFF) { 1661 if (sc->bufq.b_actf == NULL) 1662 fdmotoroff(sc); 1663 else { 1664 /* 1665 * we gained a buf request while 1666 * we waited, forget the motoroff 1667 */ 1668 sc->flags &= ~FDF_MOTOROFF; 1669 } 1670 /* 1671 * if we now have dma unit must have needed 1672 * flushing, quit 1673 */ 1674 if (fdc_indma) 1675 return; 1676 } 1677 /* 1678 * if we have no start unit and the current unit has 1679 * io waiting choose this unit to start. 1680 */ 1681 if (ssc == NULL && sc->bufq.b_actf) 1682 ssc = sc; 1683 } 1684 if (ssc) 1685 fdstart(ssc); 1686 } 1687 1688 /* 1689 * min byte count to whats left of the track in question 1690 */ 1691 void 1692 fdminphys(bp) 1693 struct buf *bp; 1694 { 1695 struct fd_softc *sc; 1696 int trk, sec, toff, tsz; 1697 1698 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1699 panic("fdminphys: couldn't get softc"); 1700 1701 trk = bp->b_blkno / sc->nsectors; 1702 sec = bp->b_blkno % sc->nsectors; 1703 1704 toff = sec * FDSECSIZE; 1705 tsz = sc->nsectors * FDSECSIZE; 1706 #ifdef FDDEBUG 1707 printf("fdminphys: before %d", bp->b_bcount); 1708 #endif 1709 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1710 #ifdef FDDEBUG 1711 printf(" after %d\n", bp->b_bcount); 1712 #endif 1713 minphys(bp); 1714 } 1715 1716 /* 1717 * encode the track cache into raw MFM ready for dma 1718 * when we go to multiple disk formats, this will call type dependent 1719 * functions 1720 */ 1721 void fdcachetoraw(sc) 1722 struct fd_softc *sc; 1723 { 1724 if (sc->openpart == FDMSDOSPART) 1725 mscachetoraw(sc); 1726 else 1727 amcachetoraw(sc); 1728 } 1729 1730 /* 1731 * decode raw MFM from dma into units track cache. 1732 * when we go to multiple disk formats, this will call type dependent 1733 * functions 1734 */ 1735 int 1736 fdrawtocache(sc) 1737 struct fd_softc *sc; 1738 { 1739 1740 if (sc->openpart == FDMSDOSPART) 1741 return(msrawtocache(sc)); 1742 else 1743 return(amrawtocache(sc)); 1744 } 1745 1746 void 1747 amcachetoraw(sc) 1748 struct fd_softc *sc; 1749 { 1750 static u_long mfmnull[4]; 1751 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1752 int sec, i; 1753 1754 rp = fdc_dmap; 1755 1756 /* 1757 * not yet one sector (- 1 long) gap. 1758 * for now use previous drivers values 1759 */ 1760 for (i = 0; i < sc->type->gap; i++) 1761 *rp++ = 0xaaaaaaaa; 1762 /* 1763 * process sectors 1764 */ 1765 dp = sc->cachep; 1766 zero = 0; 1767 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1768 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1769 hcksum = dcksum = 0; 1770 /* 1771 * sector format 1772 * offset description 1773 *----------------------------------- 1774 * 0 null 1775 * 1 sync 1776 * oddbits evenbits 1777 *---------------------- 1778 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1779 * 4-7 8-11 null 1780 * 12 13 header cksum [2-11] 1781 * 14 15 data cksum [16-271] 1782 * 16-143 144-271 data 1783 */ 1784 *rp = 0xaaaaaaaa; 1785 if (*(rp - 1) & 0x1) 1786 *rp &= 0x7fffffff; /* clock bit correction */ 1787 rp++; 1788 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1789 rp = mfmblkencode(&info, rp, &hcksum, 1); 1790 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1791 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1792 1793 crp = rp; 1794 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1795 dp += FDSECLWORDS; 1796 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1797 if (*(crp - 1) & 0x1) 1798 *crp &= 0x7fffffff; /* clock bit correction */ 1799 else if ((*crp & 0x40000000) == 0) 1800 *crp |= 0x80000000; 1801 } 1802 *rp = 0xaaa80000; 1803 if (*(rp - 1) & 0x1) 1804 *rp &= 0x7fffffff; 1805 } 1806 1807 u_long * 1808 fdfindsync(rp, ep) 1809 u_long *rp, *ep; 1810 { 1811 u_short *sp; 1812 1813 sp = (u_short *)rp; 1814 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1815 sp++; 1816 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1817 sp++; 1818 if ((u_long *)sp < ep) 1819 return((u_long *)sp); 1820 return(NULL); 1821 } 1822 1823 int 1824 amrawtocache(sc) 1825 struct fd_softc *sc; 1826 { 1827 u_long mfmnull[4]; 1828 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1829 int cnt, doagain; 1830 1831 doagain = 1; 1832 srp = rp = fdc_dmap; 1833 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1834 cnt = 0; 1835 again: 1836 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1837 #ifdef DIAGNOSTIC 1838 printf("%s: corrupted track (%d) data.\n", 1839 sc->sc_dv.dv_xname, sc->cachetrk); 1840 #endif 1841 return(-1); 1842 } 1843 1844 /* 1845 * process sectors 1846 */ 1847 for (; cnt < sc->nsectors; cnt++) { 1848 hcksum = dcksum = 0; 1849 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1850 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1851 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1852 if (cktmp != hcksum) { 1853 #ifdef FDDEBUG 1854 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1855 info, hcksum, cktmp); 1856 #endif 1857 goto again; 1858 } 1859 if (((info >> 16) & 0xff) != sc->cachetrk) { 1860 #ifdef DEBUG 1861 printf("%s: incorrect track found: 0x%lx %d\n", 1862 sc->sc_dv.dv_xname, info, sc->cachetrk); 1863 #endif 1864 goto again; 1865 } 1866 #ifdef FDDEBUG 1867 printf(" info 0x%x\n", info); 1868 #endif 1869 1870 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1871 dp = sc->cachep; 1872 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1873 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1874 if (cktmp != dcksum) { 1875 #ifdef FDDEBUG 1876 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1877 info, dcksum, cktmp); 1878 #endif 1879 goto again; 1880 } 1881 1882 /* 1883 * if we are at gap then we can no longer be sure 1884 * of correct sync marks 1885 */ 1886 if ((info && 0xff) == 1) 1887 doagain = 1; 1888 else 1889 doagain = 0; 1890 srp = rp = fdfindsync(crp, erp); 1891 } 1892 return(0); 1893 } 1894 1895 void 1896 mscachetoraw(sc) 1897 struct fd_softc *sc; 1898 { 1899 u_short *rp, *erp, crc; 1900 u_char *cp, tb[5]; 1901 int sec, i; 1902 1903 rp = (u_short *)fdc_dmap; 1904 erp = rp + sc->type->nwritew; 1905 cp = sc->cachep; 1906 1907 /* 1908 * initial track filler (828 * GAP1) 1909 */ 1910 for (i = 0; i < sc->type->gap; i++) { 1911 *rp++ = FDMFMGAP1; 1912 *rp++ = FDMFMGAP1; 1913 } 1914 1915 for (sec = 0; sec < sc->nsectors; sec++) { 1916 1917 /* 1918 * leading sector gap 1919 * (12 * GAP2) + (3 * SYNC) 1920 */ 1921 for (i = 0; i < 12; i++) 1922 *rp++ = FDMFMGAP2; 1923 *rp++ = FDMFMSYNC; 1924 *rp++ = FDMFMSYNC; 1925 *rp++ = FDMFMSYNC; 1926 1927 /* 1928 * sector information 1929 * (ID) + track + side + sector + sector size + CRC16 1930 */ 1931 *rp++ = FDMFMID; 1932 tb[0] = sc->cachetrk / FDNHEADS; 1933 tb[1] = sc->cachetrk % FDNHEADS; 1934 tb[2] = sec + 1; 1935 i = sc->bytespersec; 1936 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1937 rp = msblkencode(rp, tb, 4, &crc); 1938 tb[0] = crc >> 8; 1939 tb[1] = crc & 0xff; 1940 tb[2] = 0x4e; /* GAP1 decoded */ 1941 rp = msblkencode(rp, tb, 3, 0); 1942 1943 /* 1944 * sector info/data gap 1945 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1946 */ 1947 for (i = 0; i < 21; i++) 1948 *rp++ = FDMFMGAP1; 1949 for (i = 0; i < 12; i++) 1950 *rp++ = FDMFMGAP2; 1951 *rp++ = FDMFMSYNC; 1952 *rp++ = FDMFMSYNC; 1953 *rp++ = FDMFMSYNC; 1954 1955 /* 1956 * sector data 1957 * (DATA) + ...data... + CRC16 1958 */ 1959 *rp++ = FDMFMDATA; 1960 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1961 cp += sc->bytespersec; 1962 tb[0] = crc >> 8; 1963 tb[1] = crc & 0xff; 1964 tb[2] = 0x4e; /* GAP3 decoded */ 1965 rp = msblkencode(rp, tb, 3, 0); 1966 1967 /* 1968 * trailing sector gap 1969 * (80 * GAP3) 1970 */ 1971 for (i = 0; i < 79; i++) 1972 *rp++ = FDMFMGAP3; 1973 } 1974 1975 /* 1976 * fill rest of track with GAP3 1977 */ 1978 while (rp != erp) 1979 *rp++ = FDMFMGAP3; 1980 1981 } 1982 1983 int 1984 msrawtocache(sc) 1985 struct fd_softc *sc; 1986 { 1987 u_short *rp, *srp, *erp; 1988 u_char tb[5], *cp; 1989 int ct, sec, retry; 1990 1991 srp = rp = (u_short *)fdc_dmap; 1992 erp = rp + sc->type->nreadw; 1993 cp = sc->cachep; 1994 1995 for (ct = 0; ct < sc->nsectors; ct++) { 1996 retry = 1; 1997 do { 1998 /* 1999 * skip leading gap to sync 2000 */ 2001 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 2002 #ifdef DIAGNOSTIC 2003 printf("%s: corrupted track (%d) data.\n", 2004 sc->sc_dv.dv_xname, sc->cachetrk); 2005 #endif 2006 return(-1); 2007 } 2008 2009 /* 2010 * Grab sector info 2011 */ 2012 if (*rp++ != FDMFMID) 2013 continue; 2014 rp = msblkdecode(rp, tb, 4); 2015 #ifdef FDDEBUG 2016 printf("sector id: sector %d, track %d, side %d," 2017 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 2018 #endif 2019 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 2020 tb[2] > sc->nsectors) 2021 continue; 2022 2023 sec = tb[2]; 2024 sc->bytespersec = 128 << tb[3]; 2025 rp += 2; /* skip CRC-16 */ 2026 2027 /* 2028 * skip gap and read in data 2029 */ 2030 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 2031 return(-1); 2032 if (*rp++ != FDMFMDATA) 2033 continue; 2034 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 2035 sc->bytespersec); 2036 rp += 2; /* skip CRC-16 */ 2037 2038 retry = 0; 2039 } while (retry); 2040 } 2041 return(0); 2042 } 2043 2044 /* 2045 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2046 * this format specified that the odd bits are at current pos and even 2047 * bits at len + current pos 2048 */ 2049 u_long * 2050 mfmblkencode(dp, rp, cp, len) 2051 u_long *dp, *rp, *cp; 2052 int len; 2053 { 2054 u_long *sdp, *edp, d, dtmp, correct; 2055 2056 sdp = dp; 2057 edp = dp + len; 2058 2059 if (*(rp - 1) & 0x1) 2060 correct = 1; 2061 else 2062 correct = 0; 2063 /* 2064 * do odd bits 2065 */ 2066 while (dp < edp) { 2067 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2068 dtmp = d ^ 0x55555555; 2069 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2070 /* 2071 * correct upper clock bit if needed 2072 */ 2073 if (correct) 2074 d &= 0x7fffffff; 2075 if (d & 0x1) 2076 correct = 1; 2077 else 2078 correct = 0; 2079 /* 2080 * do checksums and store in raw buffer 2081 */ 2082 if (cp) 2083 *cp ^= d; 2084 *rp++ = d; 2085 dp++; 2086 } 2087 /* 2088 * do even bits 2089 */ 2090 dp = sdp; 2091 while (dp < edp) { 2092 d = *dp & 0x55555555; /* remove clock bits */ 2093 dtmp = d ^ 0x55555555; 2094 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2095 /* 2096 * correct upper clock bit if needed 2097 */ 2098 if (correct) 2099 d &= 0x7fffffff; 2100 if (d & 0x1) 2101 correct = 1; 2102 else 2103 correct = 0; 2104 /* 2105 * do checksums and store in raw buffer 2106 */ 2107 if (cp) 2108 *cp ^= d; 2109 *rp++ = d; 2110 dp++; 2111 } 2112 if (cp) 2113 *cp &= 0x55555555; 2114 return(rp); 2115 } 2116 2117 /* 2118 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2119 * this format specified that the odd bits are at current pos and even 2120 * bits at len + current pos 2121 */ 2122 u_long * 2123 mfmblkdecode(rp, dp, cp, len) 2124 u_long *rp, *dp, *cp; 2125 int len; 2126 { 2127 u_long o, e; 2128 int cnt; 2129 2130 cnt = len; 2131 while (cnt--) { 2132 o = *rp; 2133 e = *(rp + len); 2134 if (cp) { 2135 *cp ^= o; 2136 *cp ^= e; 2137 } 2138 o &= 0x55555555; 2139 e &= 0x55555555; 2140 *dp++ = (o << 1) | e; 2141 rp++; 2142 } 2143 if (cp) 2144 *cp &= 0x55555555; 2145 return(rp + len); 2146 } 2147 2148 /* 2149 * decode len words in standard MFM format to len bytes 2150 * of data. 2151 */ 2152 u_short * 2153 msblkdecode(rp, cp, len) 2154 u_short *rp; 2155 u_char *cp; 2156 int len; 2157 { 2158 while (len--) { 2159 *cp++ = msdecode[*rp & 0x7f] | 2160 (msdecode[(*rp >> 8) & 0x7f] << 4); 2161 rp++; 2162 } 2163 2164 return(rp); 2165 } 2166 2167 /* 2168 * encode len bytes of data into len words in standard MFM format. 2169 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2170 * as well. 2171 */ 2172 u_short * 2173 msblkencode(rp, cp, len, crc) 2174 u_short *rp; 2175 u_char *cp; 2176 int len; 2177 u_short *crc; 2178 { 2179 u_short td; 2180 u_short mycrc; 2181 2182 /* preload crc for header (4 bytes) 2183 * or data (anything else) 2184 */ 2185 mycrc = (len == 4) ? 0xb230 : 0xe295; 2186 2187 while (len--) { 2188 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2189 2190 /* Check for zeros in top bit of encode and bottom 2191 * bit of previous encode. if so, slap a one in betweem 2192 * them. 2193 */ 2194 if ((td & 0x140) == 0) 2195 td |= 0x80; 2196 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2197 td |= 0x8000; 2198 2199 *rp++ = td; 2200 2201 /* 2202 * calc crc if requested 2203 */ 2204 if (crc) 2205 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2206 2207 cp++; 2208 } 2209 2210 if (crc) 2211 *crc = mycrc; 2212 2213 return(rp); 2214 } 2215 2216 int 2217 fddump(dev, blkno, va, size) 2218 dev_t dev; 2219 daddr_t blkno; 2220 caddr_t va; 2221 size_t size; 2222 { 2223 return (EINVAL); 2224 } 2225