fd.c revision 1.44
1 /* $NetBSD: fd.c,v 1.44 2000/03/16 16:37:20 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Christian E. Hopps 5 * Copyright (c) 1996 Ezra Story 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christian E. Hopps. 19 * This product includes software developed by Ezra Story. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/buf.h> 39 #include <sys/device.h> 40 #include <sys/ioctl.h> 41 #include <sys/fcntl.h> 42 #include <sys/disklabel.h> 43 #include <sys/disk.h> 44 #include <sys/dkbad.h> 45 #include <sys/proc.h> 46 #include <machine/cpu.h> 47 #include <amiga/amiga/device.h> 48 #include <amiga/amiga/custom.h> 49 #include <amiga/amiga/cia.h> 50 #include <amiga/amiga/cc.h> 51 52 #include <sys/conf.h> 53 #include <machine/conf.h> 54 55 #include "locators.h" 56 57 enum fdc_bits { FDB_CHANGED = 2, FDB_PROTECT, FDB_CYLZERO, FDB_READY }; 58 /* 59 * partitions in fd represent different format floppies 60 * partition a is 0 etc.. 61 */ 62 enum fd_parttypes { 63 FDAMIGAPART = 0, 64 FDMSDOSPART, 65 FDMAXPARTS 66 }; 67 68 #define FDBBSIZE (8192) 69 #define FDSBSIZE (8192) 70 71 #define FDUNIT(dev) DISKUNIT(dev) 72 #define FDPART(dev) DISKPART(dev) 73 #define FDMAKEDEV(m, u, p) MAKEDISKDEV((m), (u), (p)) 74 75 /* that's nice, but we don't want to always use this as an amiga drive 76 bunghole :-) */ 77 #define FDNHEADS (2) /* amiga drives always have 2 heads */ 78 #define FDSECSIZE (512) /* amiga drives always have 512 byte sectors */ 79 #define FDSECLWORDS (128) 80 81 #define FDSETTLEDELAY (18000) /* usec delay after seeking after switch dir */ 82 #define FDSTEPDELAY (3500) /* usec delay after steping */ 83 #define FDPRESIDEDELAY (1000) /* usec delay before writing can occur */ 84 #define FDWRITEDELAY (1300) /* usec delay after write */ 85 86 #define FDSTEPOUT (1) /* decrease track step */ 87 #define FDSTEPIN (0) /* increase track step */ 88 89 #define FDCUNITMASK (0x78) /* mask for all units (bits 6-3) */ 90 91 #define FDRETRIES (2) /* default number of retries */ 92 #define FDMAXUNITS (4) /* maximum number of supported units */ 93 94 #define DISKLEN_READ (0) /* fake mask for reading */ 95 #define DISKLEN_WRITE (1 << 14) /* bit for writing */ 96 #define DISKLEN_DMAEN (1 << 15) /* dma go */ 97 #define DMABUFSZ ((DISKLEN_WRITE - 1) * 2) /* largest dma possible */ 98 99 #define FDMFMSYNC (0x4489) 100 #define FDMFMID (0x5554) 101 #define FDMFMDATA (0x5545) 102 #define FDMFMGAP1 (0x9254) 103 #define FDMFMGAP2 (0xAAAA) 104 #define FDMFMGAP3 (0x9254) 105 #define CRC16POLY (0x1021) /* (x^16) + x^12 + x^5 + x^0 */ 106 107 /* 108 * Msdos-type MFM encode/decode 109 */ 110 static u_char msdecode[128]; 111 static u_char msencode[16] = 112 { 113 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 114 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 115 }; 116 static u_short mscrctab[256]; 117 118 /* 119 5554 aaaa aaaa aaa5 2aa4 4452 aa51 120 00 00 03 02 ac 0d 121 */ 122 123 /* 124 * floppy device type 125 */ 126 struct fdtype { 127 u_int driveid; /* drive identification (from drive) */ 128 u_int ncylinders; /* number of cylinders on drive */ 129 u_int amiga_nsectors; /* number of sectors per amiga track */ 130 u_int msdos_nsectors; /* number of sectors per msdos track */ 131 u_int nreadw; /* number of words (short) read per track */ 132 u_int nwritew; /* number of words (short) written per track */ 133 u_int gap; /* track gap size in long words */ 134 u_int precomp[2]; /* 1st and 2nd precomp values */ 135 char *desc; /* description of drive type (useq) */ 136 }; 137 138 /* 139 * floppy disk device data 140 */ 141 struct fd_softc { 142 struct device sc_dv; /* generic device info; must come first */ 143 struct disk dkdev; /* generic disk info */ 144 struct buf_queue bufq; /* queue pending I/O operations */ 145 struct buf curbuf; /* state of current I/O operation */ 146 struct fdtype *type; 147 void *cachep; /* cached track data (write through) */ 148 int cachetrk; /* cahced track -1 for none */ 149 int hwunit; /* unit for amiga controlling hw */ 150 int unitmask; /* mask for cia select deslect */ 151 int pstepdir; /* previous step direction */ 152 int curcyl; /* current curcyl head positioned on */ 153 int flags; /* misc flags */ 154 int wlabel; 155 int stepdelay; /* useq to delay after seek user setable */ 156 int nsectors; /* number of sectors per track */ 157 int openpart; /* which partition [ab] == [12] is open */ 158 short retries; /* number of times to retry failed io */ 159 short retried; /* number of times current io retried */ 160 int bytespersec; /* number of bytes per sector */ 161 }; 162 163 /* fd_softc->flags */ 164 #define FDF_MOTORON (0x01) /* motor is running */ 165 #define FDF_MOTOROFF (0x02) /* motor is waiting to be turned off */ 166 #define FDF_WMOTOROFF (0x04) /* unit wants a wakeup after off */ 167 #define FDF_DIRTY (0x08) /* track cache needs write */ 168 #define FDF_WRITEWAIT (0x10) /* need to head select delay on next setpos */ 169 #define FDF_HAVELABEL (0x20) /* label is valid */ 170 #define FDF_JUSTFLUSH (0x40) /* don't bother caching track. */ 171 #define FDF_NOTRACK0 (0x80) /* was not able to recalibrate drive */ 172 173 int fdc_wantwakeup; 174 int fdc_side; 175 void *fdc_dmap; 176 struct fd_softc *fdc_indma; 177 int fdc_dmalen; 178 int fdc_dmawrite; 179 180 struct fdcargs { 181 struct fdtype *type; 182 int unit; 183 }; 184 185 int fdcmatch __P((struct device *, struct cfdata *, void *)); 186 void fdcattach __P((struct device *, struct device *, void *)); 187 int fdcprint __P((void *, const char *)); 188 int fdmatch __P((struct device *, struct cfdata *, void *)); 189 void fdattach __P((struct device *, struct device *, void *)); 190 191 void fdintr __P((int)); 192 void fdidxintr __P((void)); 193 void fdstrategy __P((struct buf *)); 194 int fdloaddisk __P((struct fd_softc *)); 195 void fdgetdefaultlabel __P((struct fd_softc *, struct disklabel *, int)); 196 int fdgetdisklabel __P((struct fd_softc *, dev_t)); 197 int fdsetdisklabel __P((struct fd_softc *, struct disklabel *)); 198 int fdputdisklabel __P((struct fd_softc *, dev_t)); 199 struct fdtype * fdcgetfdtype __P((int)); 200 void fdmotoroff __P((void *)); 201 void fdsetpos __P((struct fd_softc *, int, int)); 202 void fdselunit __P((struct fd_softc *)); 203 void fdstart __P((struct fd_softc *)); 204 void fdcont __P((struct fd_softc *)); 205 void fddmastart __P((struct fd_softc *, int)); 206 void fdcalibrate __P((void *)); 207 void fddmadone __P((struct fd_softc *, int)); 208 void fddone __P((struct fd_softc *)); 209 void fdfindwork __P((int)); 210 void fdminphys __P((struct buf *)); 211 void fdcachetoraw __P((struct fd_softc *)); 212 void amcachetoraw __P((struct fd_softc *)); 213 int amrawtocache __P((struct fd_softc *)); 214 u_long *fdfindsync __P((u_long *, u_long *)); 215 int fdrawtocache __P((struct fd_softc *)); 216 void mscachetoraw __P((struct fd_softc *)); 217 int msrawtocache __P((struct fd_softc *)); 218 u_long *mfmblkencode __P((u_long *, u_long *, u_long *, int)); 219 u_long *mfmblkdecode __P((u_long *, u_long *, u_long *, int)); 220 u_short *msblkdecode __P((u_short *, u_char *, int)); 221 u_short *msblkencode __P((u_short *, u_char *, int, u_short *)); 222 223 struct dkdriver fddkdriver = { fdstrategy }; 224 225 /* 226 * read size is (nsectors + 1) * mfm secsize + gap bytes + 2 shorts 227 * write size is nsectors * mfm secsize + gap bytes + 3 shorts 228 * the extra shorts are to deal with a dma hw bug in the controller 229 * they are probably too much (I belive the bug is 1 short on write and 230 * 3 bits on read) but there is no need to be cheap here. 231 */ 232 #define MAXTRKSZ (22 * FDSECSIZE) 233 struct fdtype fdtype[] = { 234 { 0x00000000, 80, 11, 9, 7358, 6815, 414, { 80, 161 }, "3.5dd" }, 235 { 0x55555555, 40, 11, 9, 7358, 6815, 414, { 80, 161 }, "5.25dd" }, 236 { 0xAAAAAAAA, 80, 22, 18, 14716, 13630, 828, { 80, 161 }, "3.5hd" } 237 }; 238 int nfdtype = sizeof(fdtype) / sizeof(*fdtype); 239 240 struct cfattach fd_ca = { 241 sizeof(struct fd_softc), fdmatch, fdattach 242 }; 243 244 extern struct cfdriver fd_cd; 245 246 struct cfattach fdc_ca = { 247 sizeof(struct device), fdcmatch, fdcattach 248 }; 249 250 /* 251 * all hw access through macros, this helps to hide the active low 252 * properties 253 */ 254 255 #define FDUNITMASK(unit) (1 << (3 + (unit))) 256 257 /* 258 * select units using mask 259 */ 260 #define FDSELECT(um) do { ciab.prb &= ~(um); } while (0) 261 262 /* 263 * deselect units using mask 264 */ 265 #define FDDESELECT(um) do { ciab.prb |= (um); delay(1); } while (0) 266 267 /* 268 * test hw condition bits 269 */ 270 #define FDTESTC(bit) ((ciaa.pra & (1 << (bit))) == 0) 271 272 /* 273 * set motor for select units, true motor on else off 274 */ 275 #define FDSETMOTOR(on) do { \ 276 if (on) ciab.prb &= ~CIAB_PRB_MTR; else ciab.prb |= CIAB_PRB_MTR; \ 277 } while (0) 278 279 /* 280 * set head for select units 281 */ 282 #define FDSETHEAD(head) do { \ 283 if (head) ciab.prb &= ~CIAB_PRB_SIDE; else ciab.prb |= CIAB_PRB_SIDE; \ 284 delay(1); } while (0) 285 286 /* 287 * select direction, true towards spindle else outwards 288 */ 289 #define FDSETDIR(in) do { \ 290 if (in) ciab.prb &= ~CIAB_PRB_DIR; else ciab.prb |= CIAB_PRB_DIR; \ 291 delay(1); } while (0) 292 293 /* 294 * step the selected units 295 */ 296 #define FDSTEP do { \ 297 ciab.prb &= ~CIAB_PRB_STEP; ciab.prb |= CIAB_PRB_STEP; \ 298 } while (0) 299 300 #define FDDMASTART(len, towrite) do { \ 301 int dmasz = (len) | ((towrite) ? DISKLEN_WRITE : 0) | DISKLEN_DMAEN; \ 302 custom.dsklen = dmasz; custom.dsklen = dmasz; } while (0) 303 304 #define FDDMASTOP do { custom.dsklen = 0; } while (0) 305 306 307 int 308 fdcmatch(pdp, cfp, auxp) 309 struct device *pdp; 310 struct cfdata *cfp; 311 void *auxp; 312 { 313 static int fdc_matched = 0; 314 315 /* Allow only once instance. */ 316 if (matchname("fdc", auxp) == 0 || fdc_matched) 317 return(0); 318 if ((fdc_dmap = alloc_chipmem(DMABUFSZ)) == NULL) { 319 printf("fdc: unable to allocate dma buffer\n"); 320 return(0); 321 } 322 323 fdc_matched = 1; 324 return(1); 325 } 326 327 void 328 fdcattach(pdp, dp, auxp) 329 struct device *pdp, *dp; 330 void *auxp; 331 { 332 struct fdcargs args; 333 334 printf(": dmabuf pa 0x%x", kvtop(fdc_dmap)); 335 printf(": dmabuf ka %p\n", fdc_dmap); 336 args.unit = 0; 337 args.type = fdcgetfdtype(args.unit); 338 339 fdc_side = -1; 340 config_found(dp, &args, fdcprint); 341 for (args.unit++; args.unit < FDMAXUNITS; args.unit++) { 342 if ((args.type = fdcgetfdtype(args.unit)) == NULL) 343 continue; 344 config_found(dp, &args, fdcprint); 345 } 346 } 347 348 int 349 fdcprint(auxp, pnp) 350 void *auxp; 351 const char *pnp; 352 { 353 struct fdcargs *fcp; 354 355 fcp = auxp; 356 if (pnp) 357 printf("fd%d at %s unit %d:", fcp->unit, pnp, 358 fcp->type->driveid); 359 return(UNCONF); 360 } 361 362 /*ARGSUSED*/ 363 int 364 fdmatch(pdp, cfp, auxp) 365 struct device *pdp; 366 struct cfdata *cfp; 367 void *auxp; 368 { 369 struct fdcargs *fdap; 370 371 fdap = auxp; 372 if (cfp->cf_loc[FDCCF_UNIT] == fdap->unit || 373 cfp->cf_loc[FDCCF_UNIT] == FDCCF_UNIT_DEFAULT) 374 return(1); 375 376 return(0); 377 } 378 379 void 380 fdattach(pdp, dp, auxp) 381 struct device *pdp, *dp; 382 void *auxp; 383 { 384 struct fdcargs *ap; 385 struct fd_softc *sc; 386 int i; 387 388 ap = auxp; 389 sc = (struct fd_softc *)dp; 390 391 BUFQ_INIT(&sc->bufq); 392 393 sc->curcyl = sc->cachetrk = -1; 394 sc->openpart = -1; 395 sc->type = ap->type; 396 sc->hwunit = ap->unit; 397 sc->unitmask = 1 << (3 + ap->unit); 398 sc->retries = FDRETRIES; 399 sc->stepdelay = FDSTEPDELAY; 400 sc->bytespersec = 512; 401 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 402 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 403 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 404 405 /* 406 * Initialize and attach the disk structure. 407 */ 408 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 409 sc->dkdev.dk_driver = &fddkdriver; 410 disk_attach(&sc->dkdev); 411 412 /* 413 * calibrate the drive 414 */ 415 fdsetpos(sc, 0, 0); 416 fdsetpos(sc, sc->type->ncylinders, 0); 417 fdsetpos(sc, 0, 0); 418 fdmotoroff(sc); 419 420 /* 421 * precalc msdos MFM and CRC 422 */ 423 for (i = 0; i < 128; i++) 424 msdecode[i] = 0xff; 425 for (i = 0; i < 16; i++) 426 msdecode[msencode[i]] = i; 427 for (i = 0; i < 256; i++) { 428 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 429 (0x1021 * (i >> 4)); 430 } 431 432 /* 433 * enable disk related interrupts 434 */ 435 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 436 custom.intena = INTF_SETCLR | INTF_DSKBLK; 437 ciab.icr = CIA_ICR_FLG; 438 } 439 440 /*ARGSUSED*/ 441 int 442 fdopen(dev, flags, devtype, p) 443 dev_t dev; 444 int flags, devtype; 445 struct proc *p; 446 { 447 struct fd_softc *sc; 448 int wasopen, fwork, error, s; 449 450 error = 0; 451 452 if (FDPART(dev) >= FDMAXPARTS) 453 return(ENXIO); 454 455 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 456 return(ENXIO); 457 if (sc->flags & FDF_NOTRACK0) 458 return(ENXIO); 459 if (sc->cachep == NULL) 460 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 461 462 s = splbio(); 463 /* 464 * if we are sleeping in fdclose(); waiting for a chance to 465 * shut the motor off, do a sleep here also. 466 */ 467 while (sc->flags & FDF_WMOTOROFF) 468 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 469 470 fwork = 0; 471 /* 472 * if not open let user open request type, otherwise 473 * ensure they are trying to open same type. 474 */ 475 if (sc->openpart == FDPART(dev)) 476 wasopen = 1; 477 else if (sc->openpart == -1) { 478 sc->openpart = FDPART(dev); 479 wasopen = 0; 480 } else { 481 wasopen = 1; 482 error = EPERM; 483 goto done; 484 } 485 486 /* 487 * wait for current io to complete if any 488 */ 489 if (fdc_indma) { 490 fwork = 1; 491 fdc_wantwakeup++; 492 tsleep(fdopen, PRIBIO, "fdopen", 0); 493 } 494 if ((error = fdloaddisk(sc)) != 0) 495 goto done; 496 if ((error = fdgetdisklabel(sc, dev)) != 0) 497 goto done; 498 #ifdef FDDEBUG 499 printf(" open successful\n"); 500 #endif 501 done: 502 /* 503 * if we requested that fddone()->fdfindwork() wake us, allow it to 504 * complete its job now 505 */ 506 if (fwork) 507 fdfindwork(FDUNIT(dev)); 508 splx(s); 509 510 /* 511 * if we were not open and we marked us so reverse that. 512 */ 513 if (error && wasopen == 0) 514 sc->openpart = -1; 515 return(error); 516 } 517 518 /*ARGSUSED*/ 519 int 520 fdclose(dev, flags, devtype, p) 521 dev_t dev; 522 int flags, devtype; 523 struct proc *p; 524 { 525 struct fd_softc *sc; 526 int s; 527 528 #ifdef FDDEBUG 529 printf("fdclose()\n"); 530 #endif 531 sc = getsoftc(fd_cd, FDUNIT(dev)); 532 s = splbio(); 533 if (sc->flags & FDF_MOTORON) { 534 sc->flags |= FDF_WMOTOROFF; 535 tsleep(fdmotoroff, PRIBIO, "fdclose", 0); 536 sc->flags &= ~FDF_WMOTOROFF; 537 wakeup(fdmotoroff); 538 } 539 sc->openpart = -1; 540 splx(s); 541 return(0); 542 } 543 544 int 545 fdioctl(dev, cmd, addr, flag, p) 546 dev_t dev; 547 u_long cmd; 548 caddr_t addr; 549 int flag; 550 struct proc *p; 551 { 552 struct fd_softc *sc; 553 int error, wlab; 554 555 sc = getsoftc(fd_cd, FDUNIT(dev)); 556 557 if ((sc->flags & FDF_HAVELABEL) == 0) 558 return(EBADF); 559 560 switch (cmd) { 561 case DIOCSBAD: 562 return(EINVAL); 563 case DIOCSRETRIES: 564 if (*(int *)addr < 0) 565 return(EINVAL); 566 sc->retries = *(int *)addr; 567 return(0); 568 case DIOCSSTEP: 569 if (*(int *)addr < FDSTEPDELAY) 570 return(EINVAL); 571 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 572 return(0); 573 case DIOCGDINFO: 574 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 575 return(0); 576 case DIOCGPART: 577 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 578 ((struct partinfo *)addr)->part = 579 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 580 return(0); 581 case DIOCSDINFO: 582 if ((flag & FWRITE) == 0) 583 return(EBADF); 584 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 585 case DIOCWDINFO: 586 if ((flag & FWRITE) == 0) 587 return(EBADF); 588 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 589 return(error); 590 wlab = sc->wlabel; 591 sc->wlabel = 1; 592 error = fdputdisklabel(sc, dev); 593 sc->wlabel = wlab; 594 return(error); 595 case DIOCWLABEL: 596 if ((flag & FWRITE) == 0) 597 return(EBADF); 598 sc->wlabel = *(int *)addr; 599 return(0); 600 case DIOCGDEFLABEL: 601 fdgetdefaultlabel(sc, (struct disklabel *)addr, FDPART(dev)); 602 return(0); 603 default: 604 return(ENOTTY); 605 } 606 } 607 608 /* 609 * no dumps to floppy disks thank you. 610 */ 611 int 612 fdsize(dev) 613 dev_t dev; 614 { 615 return(-1); 616 } 617 618 int 619 fdread(dev, uio, flags) 620 dev_t dev; 621 struct uio *uio; 622 int flags; 623 { 624 return (physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 625 } 626 627 int 628 fdwrite(dev, uio, flags) 629 dev_t dev; 630 struct uio *uio; 631 int flags; 632 { 633 return (physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 634 } 635 636 637 void 638 fdintr(flag) 639 int flag; 640 { 641 int s; 642 643 s = splbio(); 644 if (fdc_indma) 645 fddmadone(fdc_indma, 0); 646 splx(s); 647 } 648 649 void 650 fdidxintr() 651 { 652 if (fdc_indma && fdc_dmalen) { 653 /* 654 * turn off intr and start actual dma 655 */ 656 ciab.icr = CIA_ICR_FLG; 657 FDDMASTART(fdc_dmalen, fdc_dmawrite); 658 fdc_dmalen = 0; 659 } 660 } 661 662 void 663 fdstrategy(bp) 664 struct buf *bp; 665 { 666 struct disklabel *lp; 667 struct fd_softc *sc; 668 int unit, part, s; 669 670 unit = FDUNIT(bp->b_dev); 671 part = FDPART(bp->b_dev); 672 sc = getsoftc(fd_cd, unit); 673 674 #ifdef FDDEBUG 675 printf("fdstrategy: 0x%x\n", bp); 676 #endif 677 /* 678 * check for valid partition and bounds 679 */ 680 lp = sc->dkdev.dk_label; 681 if ((sc->flags & FDF_HAVELABEL) == 0) { 682 bp->b_error = EIO; 683 goto bad; 684 } 685 if (bounds_check_with_label(bp, lp, sc->wlabel) <= 0) 686 goto done; 687 688 /* 689 * trans count of zero or bounds check indicates io is done 690 * we are done. 691 */ 692 if (bp->b_bcount == 0) 693 goto done; 694 695 bp->b_rawblkno = bp->b_blkno; 696 697 /* 698 * queue the buf and kick the low level code 699 */ 700 s = splbio(); 701 disksort_cylinder(&sc->bufq, bp); 702 fdstart(sc); 703 splx(s); 704 return; 705 bad: 706 bp->b_flags |= B_ERROR; 707 done: 708 bp->b_resid = bp->b_bcount; 709 biodone(bp); 710 } 711 712 /* 713 * make sure disk is loaded and label is up-to-date. 714 */ 715 int 716 fdloaddisk(sc) 717 struct fd_softc *sc; 718 { 719 /* 720 * if diskchange is low step drive to 0 then up one then to zero. 721 */ 722 fdselunit(sc); /* make sure the unit is selected */ 723 if (FDTESTC(FDB_CHANGED)) { 724 fdsetpos(sc, 0, 0); 725 sc->cachetrk = -1; /* invalidate the cache */ 726 sc->flags &= ~FDF_HAVELABEL; 727 fdsetpos(sc, FDNHEADS, 0); 728 fdsetpos(sc, 0, 0); 729 if (FDTESTC(FDB_CHANGED)) { 730 fdmotoroff(sc); 731 FDDESELECT(sc->unitmask); 732 return(ENXIO); 733 } 734 } 735 FDDESELECT(sc->unitmask); 736 fdmotoroff(sc); 737 sc->type = fdcgetfdtype(sc->hwunit); 738 if (sc->type == NULL) 739 return(ENXIO); 740 if (sc->openpart == FDMSDOSPART) 741 sc->nsectors = sc->type->msdos_nsectors; 742 else 743 sc->nsectors = sc->type->amiga_nsectors; 744 return(0); 745 } 746 747 void 748 fdgetdefaultlabel(sc, lp, part) 749 struct fd_softc *sc; 750 struct disklabel *lp; 751 int part; /* XXX ick */ 752 { 753 754 bzero(lp, sizeof(struct disklabel)); 755 lp->d_secsize = FDSECSIZE; 756 lp->d_ntracks = FDNHEADS; 757 lp->d_ncylinders = sc->type->ncylinders; 758 lp->d_nsectors = sc->nsectors; 759 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 760 lp->d_type = DTYPE_FLOPPY; 761 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 762 lp->d_rpm = 300; /* good guess I suppose. */ 763 lp->d_interleave = 1; /* should change when adding msdos */ 764 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 765 lp->d_bbsize = 0; 766 lp->d_sbsize = 0; 767 lp->d_partitions[part].p_size = lp->d_secperunit; 768 lp->d_partitions[part].p_fstype = FS_UNUSED; 769 lp->d_partitions[part].p_fsize = 1024; 770 lp->d_partitions[part].p_frag = 8; 771 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 772 lp->d_npartitions = part + 1; 773 lp->d_magic = lp->d_magic2 = DISKMAGIC; 774 lp->d_checksum = dkcksum(lp); 775 } 776 777 /* 778 * read disk label, if present otherwise create one 779 * return a new label if raw part and none found, otherwise err. 780 */ 781 int 782 fdgetdisklabel(sc, dev) 783 struct fd_softc *sc; 784 dev_t dev; 785 { 786 struct disklabel *lp, *dlp; 787 struct cpu_disklabel *clp; 788 struct buf *bp; 789 int error, part; 790 791 if (sc->flags & FDF_HAVELABEL && 792 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 793 return(0); 794 #ifdef FDDEBUG 795 printf("fdgetdisklabel()\n"); 796 #endif 797 part = FDPART(dev); 798 lp = sc->dkdev.dk_label; 799 clp = sc->dkdev.dk_cpulabel; 800 bzero(lp, sizeof(struct disklabel)); 801 bzero(clp, sizeof(struct cpu_disklabel)); 802 803 lp->d_secsize = FDSECSIZE; 804 lp->d_ntracks = FDNHEADS; 805 lp->d_ncylinders = sc->type->ncylinders; 806 lp->d_nsectors = sc->nsectors; 807 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 808 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 809 lp->d_npartitions = part + 1; 810 lp->d_partitions[part].p_size = lp->d_secperunit; 811 lp->d_partitions[part].p_fstype = FS_UNUSED; 812 lp->d_partitions[part].p_fsize = 1024; 813 lp->d_partitions[part].p_frag = 8; 814 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 815 816 sc->flags |= FDF_HAVELABEL; 817 818 bp = (void *)geteblk((int)lp->d_secsize); 819 bp->b_dev = dev; 820 bp->b_blkno = 0; 821 bp->b_cylinder = 0; 822 bp->b_bcount = FDSECSIZE; 823 bp->b_flags = B_BUSY | B_READ; 824 fdstrategy(bp); 825 if ((error = biowait(bp)) != 0) 826 goto nolabel; 827 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 828 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 829 dkcksum(dlp)) { 830 error = EINVAL; 831 goto nolabel; 832 } 833 bcopy(dlp, lp, sizeof(struct disklabel)); 834 if (lp->d_trkseek > FDSTEPDELAY) 835 sc->stepdelay = lp->d_trkseek; 836 brelse(bp); 837 return(0); 838 nolabel: 839 fdgetdefaultlabel(sc, lp, part); 840 brelse(bp); 841 return(0); 842 } 843 844 /* 845 * set the incore copy of this units disklabel 846 */ 847 int 848 fdsetdisklabel(sc, lp) 849 struct fd_softc *sc; 850 struct disklabel *lp; 851 { 852 struct disklabel *clp; 853 struct partition *pp; 854 855 /* 856 * must have at least opened raw unit to fetch the 857 * raw_part stuff. 858 */ 859 if ((sc->flags & FDF_HAVELABEL) == 0) 860 return(EINVAL); 861 clp = sc->dkdev.dk_label; 862 /* 863 * make sure things check out and we only have one valid 864 * partition 865 */ 866 #ifdef FDDEBUG 867 printf("fdsetdisklabel\n"); 868 #endif 869 if (lp->d_secsize != FDSECSIZE || 870 lp->d_nsectors != clp->d_nsectors || 871 lp->d_ntracks != FDNHEADS || 872 lp->d_ncylinders != clp->d_ncylinders || 873 lp->d_secpercyl != clp->d_secpercyl || 874 lp->d_secperunit != clp->d_secperunit || 875 lp->d_magic != DISKMAGIC || 876 lp->d_magic2 != DISKMAGIC || 877 lp->d_npartitions == 0 || 878 lp->d_npartitions > FDMAXPARTS || 879 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 880 dkcksum(lp)) 881 return(EINVAL); 882 /* 883 * if any partitions are present make sure they 884 * represent the currently open type 885 */ 886 if ((pp = &lp->d_partitions[0])->p_size) { 887 if ((pp = &lp->d_partitions[1])->p_size == 0) 888 goto done; 889 else if (sc->openpart != 1) 890 return(EINVAL); 891 } else if (sc->openpart != 0) 892 return(EINVAL); 893 /* 894 * make sure selected partition is within bounds 895 * XXX on the second check, its to handle a bug in 896 * XXX the cluster routines as they require mutliples 897 * XXX of NBPG currently 898 */ 899 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 900 (pp->p_frag * pp->p_fsize % NBPG)) 901 return(EINVAL); 902 done: 903 bcopy(lp, clp, sizeof(struct disklabel)); 904 return(0); 905 } 906 907 /* 908 * write out the incore copy of this units disklabel 909 */ 910 int 911 fdputdisklabel(sc, dev) 912 struct fd_softc *sc; 913 dev_t dev; 914 { 915 struct disklabel *lp, *dlp; 916 struct buf *bp; 917 int error; 918 919 if ((sc->flags & FDF_HAVELABEL) == 0) 920 return(EBADF); 921 #ifdef FDDEBUG 922 printf("fdputdisklabel\n"); 923 #endif 924 /* 925 * get buf and read in sector 0 926 */ 927 lp = sc->dkdev.dk_label; 928 bp = (void *)geteblk((int)lp->d_secsize); 929 bp->b_dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 930 bp->b_blkno = 0; 931 bp->b_cylinder = 0; 932 bp->b_bcount = FDSECSIZE; 933 bp->b_flags = B_BUSY | B_READ; 934 fdstrategy(bp); 935 if ((error = biowait(bp)) != 0) 936 goto done; 937 /* 938 * copy disklabel to buf and write it out syncronous 939 */ 940 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 941 bcopy(lp, dlp, sizeof(struct disklabel)); 942 bp->b_blkno = 0; 943 bp->b_cylinder = 0; 944 bp->b_flags = B_WRITE; 945 fdstrategy(bp); 946 error = biowait(bp); 947 done: 948 brelse(bp); 949 return(error); 950 } 951 952 /* 953 * figure out drive type or NULL if none. 954 */ 955 struct fdtype * 956 fdcgetfdtype(unit) 957 int unit; 958 { 959 struct fdtype *ftp; 960 u_long id, idb; 961 int cnt, umask; 962 963 id = 0; 964 umask = 1 << (3 + unit); 965 966 FDDESELECT(FDCUNITMASK); 967 968 FDSETMOTOR(1); 969 delay(1); 970 FDSELECT(umask); 971 delay(1); 972 FDDESELECT(umask); 973 974 FDSETMOTOR(0); 975 delay(1); 976 FDSELECT(umask); 977 delay(1); 978 FDDESELECT(umask); 979 980 for (idb = 0x80000000; idb; idb >>= 1) { 981 FDSELECT(umask); 982 delay(1); 983 if (FDTESTC(FDB_READY) == 0) 984 id |= idb; 985 FDDESELECT(umask); 986 delay(1); 987 } 988 #ifdef FDDEBUG 989 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 990 #endif 991 992 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 993 if (ftp->driveid == id) 994 return(ftp); 995 /* 996 * 3.5dd's at unit 0 do not always return id. 997 */ 998 if (unit == 0) 999 return(fdtype); 1000 return(NULL); 1001 } 1002 1003 /* 1004 * turn motor off if possible otherwise mark as needed and will be done 1005 * later. 1006 */ 1007 void 1008 fdmotoroff(arg) 1009 void *arg; 1010 { 1011 struct fd_softc *sc; 1012 int s; 1013 1014 sc = arg; 1015 s = splbio(); 1016 1017 #ifdef FDDEBUG 1018 printf("fdmotoroff: unit %d\n", sc->hwunit); 1019 #endif 1020 if ((sc->flags & FDF_MOTORON) == 0) 1021 goto done; 1022 /* 1023 * if we have a timeout on a dma operation let fddmadone() 1024 * deal with it. 1025 */ 1026 if (fdc_indma == sc) { 1027 fddmadone(sc, 1); 1028 goto done; 1029 } 1030 #ifdef FDDEBUG 1031 printf(" motor was on, turning off\n"); 1032 #endif 1033 1034 /* 1035 * flush cache if needed 1036 */ 1037 if (sc->flags & FDF_DIRTY) { 1038 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1039 #ifdef FDDEBUG 1040 printf(" flushing dirty buffer first\n"); 1041 #endif 1042 /* 1043 * if dma'ing done for now, fddone() will call us again 1044 */ 1045 if (fdc_indma) 1046 goto done; 1047 fddmastart(sc, sc->cachetrk); 1048 goto done; 1049 } 1050 1051 /* 1052 * if controller is busy just schedule us to be called back 1053 */ 1054 if (fdc_indma) { 1055 /* 1056 * someone else has the controller now 1057 * just set flag and let fddone() call us again. 1058 */ 1059 sc->flags |= FDF_MOTOROFF; 1060 goto done; 1061 } 1062 1063 #ifdef FDDEBUG 1064 printf(" hw turning unit off\n"); 1065 #endif 1066 1067 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1068 FDDESELECT(FDCUNITMASK); 1069 FDSETMOTOR(0); 1070 delay(1); 1071 FDSELECT(sc->unitmask); 1072 delay(4); 1073 FDDESELECT(sc->unitmask); 1074 delay(1); 1075 if (sc->flags & FDF_WMOTOROFF) 1076 wakeup(fdmotoroff); 1077 done: 1078 splx(s); 1079 } 1080 1081 /* 1082 * select drive seek to track exit with motor on. 1083 * fdsetpos(x, 0, 0) does calibrates the drive. 1084 */ 1085 void 1086 fdsetpos(sc, trk, towrite) 1087 struct fd_softc *sc; 1088 int trk, towrite; 1089 { 1090 int nstep, sdir, ondly, ncyl, nside; 1091 1092 FDDESELECT(FDCUNITMASK); 1093 FDSETMOTOR(1); 1094 delay(1); 1095 FDSELECT(sc->unitmask); 1096 delay(1); 1097 if ((sc->flags & FDF_MOTORON) == 0) { 1098 ondly = 0; 1099 while (FDTESTC(FDB_READY) == 0) { 1100 delay(1000); 1101 if (++ondly >= 1000) 1102 break; 1103 } 1104 } 1105 sc->flags |= FDF_MOTORON; 1106 1107 ncyl = trk / FDNHEADS; 1108 nside = trk % FDNHEADS; 1109 1110 if (sc->curcyl == ncyl && fdc_side == nside) 1111 return; 1112 1113 if (towrite) 1114 sc->flags |= FDF_WRITEWAIT; 1115 1116 #ifdef FDDEBUG 1117 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1118 trk % FDNHEADS, towrite); 1119 #endif 1120 nstep = ncyl - sc->curcyl; 1121 if (nstep) { 1122 /* 1123 * figure direction 1124 */ 1125 if (nstep > 0 && ncyl != 0) { 1126 sdir = FDSTEPIN; 1127 FDSETDIR(1); 1128 } else { 1129 nstep = -nstep; 1130 sdir = FDSTEPOUT; 1131 FDSETDIR(0); 1132 } 1133 if (ncyl == 0) { 1134 /* 1135 * either just want cylinder 0 or doing 1136 * a calibrate. 1137 */ 1138 nstep = 256; 1139 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1140 FDSTEP; 1141 delay(sc->stepdelay); 1142 } 1143 if (nstep < 0) 1144 sc->flags |= FDF_NOTRACK0; 1145 } else { 1146 /* 1147 * step the needed amount amount. 1148 */ 1149 while (nstep--) { 1150 FDSTEP; 1151 delay(sc->stepdelay); 1152 } 1153 } 1154 /* 1155 * if switched directions 1156 * allow drive to settle. 1157 */ 1158 if (sc->pstepdir != sdir) 1159 delay(FDSETTLEDELAY); 1160 sc->pstepdir = sdir; 1161 sc->curcyl = ncyl; 1162 } 1163 if (nside == fdc_side) 1164 return; 1165 /* 1166 * select side 1167 */ 1168 fdc_side = nside; 1169 FDSETHEAD(nside); 1170 delay(FDPRESIDEDELAY); 1171 } 1172 1173 void 1174 fdselunit(sc) 1175 struct fd_softc *sc; 1176 { 1177 FDDESELECT(FDCUNITMASK); /* deselect all */ 1178 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1179 delay(1); 1180 FDSELECT(sc->unitmask); /* select unit */ 1181 delay(1); 1182 } 1183 1184 /* 1185 * process next buf on device queue. 1186 * normall sequence of events: 1187 * fdstart() -> fddmastart(); 1188 * fdidxintr(); 1189 * fdintr() -> fddmadone() -> fddone(); 1190 * if the track is in the cache then fdstart() will short-circuit 1191 * to fddone() else if the track cache is dirty it will flush. If 1192 * the buf is not an entire track it will cache the requested track. 1193 */ 1194 void 1195 fdstart(sc) 1196 struct fd_softc *sc; 1197 { 1198 int trk, error, write; 1199 struct buf *bp, *dp; 1200 int changed; 1201 1202 #ifdef FDDEBUG 1203 printf("fdstart: unit %d\n", sc->hwunit); 1204 #endif 1205 1206 /* 1207 * if dma'ing just return. we must have been called from fdstartegy. 1208 */ 1209 if (fdc_indma) 1210 return; 1211 1212 /* 1213 * get next buf if there. 1214 */ 1215 dp = &sc->curbuf; 1216 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) { 1217 #ifdef FDDEBUG 1218 printf(" nothing to do\n"); 1219 #endif 1220 return; 1221 } 1222 1223 /* 1224 * Mark us as busy now, in case fddone() gets called in one 1225 * of the cases below. 1226 */ 1227 disk_busy(&sc->dkdev); 1228 1229 /* 1230 * make sure same disk is loaded 1231 */ 1232 fdselunit(sc); 1233 changed = FDTESTC(FDB_CHANGED); 1234 FDDESELECT(sc->unitmask); 1235 if (changed) { 1236 /* 1237 * disk missing, invalidate all future io on 1238 * this unit until re-open()'ed also invalidate 1239 * all current io 1240 */ 1241 printf("fdstart: disk changed\n"); 1242 #ifdef FDDEBUG 1243 printf(" disk was removed invalidating all io\n"); 1244 #endif 1245 sc->flags &= ~FDF_HAVELABEL; 1246 for (;;) { 1247 bp->b_flags |= B_ERROR; 1248 bp->b_error = EIO; 1249 if (BUFQ_NEXT(bp) == NULL) 1250 break; 1251 biodone(bp); 1252 bp = BUFQ_NEXT(bp); 1253 } 1254 /* 1255 * do fddone() on last buf to allow other units to start. 1256 */ 1257 BUFQ_INSERT_HEAD(&sc->bufq, bp); 1258 fddone(sc); 1259 return; 1260 } 1261 1262 /* 1263 * we have a valid buf, setup our local version 1264 * we use this count to allow reading over multiple tracks. 1265 * into a single buffer 1266 */ 1267 dp->b_bcount = bp->b_bcount; 1268 dp->b_blkno = bp->b_blkno; 1269 dp->b_data = bp->b_data; 1270 dp->b_flags = bp->b_flags; 1271 dp->b_resid = 0; 1272 1273 if (bp->b_flags & B_READ) 1274 write = 0; 1275 else if (FDTESTC(FDB_PROTECT) == 0) 1276 write = 1; 1277 else { 1278 error = EPERM; 1279 goto bad; 1280 } 1281 1282 /* 1283 * figure trk given blkno 1284 */ 1285 trk = bp->b_blkno / sc->nsectors; 1286 1287 /* 1288 * check to see if same as currently cached track 1289 * if so we need to do no dma read. 1290 */ 1291 if (trk == sc->cachetrk) { 1292 fddone(sc); 1293 return; 1294 } 1295 1296 /* 1297 * if we will be overwriting the entire cache, don't bother to 1298 * fetch it. 1299 */ 1300 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1301 bp->b_blkno % sc->nsectors == 0) { 1302 if (sc->flags & FDF_DIRTY) 1303 sc->flags |= FDF_JUSTFLUSH; 1304 else { 1305 sc->cachetrk = trk; 1306 fddone(sc); 1307 return; 1308 } 1309 } 1310 1311 /* 1312 * start dma read of `trk' 1313 */ 1314 fddmastart(sc, trk); 1315 return; 1316 bad: 1317 bp->b_flags |= B_ERROR; 1318 bp->b_error = error; 1319 fddone(sc); 1320 } 1321 1322 /* 1323 * continue a started operation on next track. always begin at 1324 * sector 0 on the next track. 1325 */ 1326 void 1327 fdcont(sc) 1328 struct fd_softc *sc; 1329 { 1330 struct buf *dp, *bp; 1331 int trk, write; 1332 1333 dp = &sc->curbuf; 1334 bp = BUFQ_FIRST(&sc->bufq); 1335 dp->b_data += (dp->b_bcount - bp->b_resid); 1336 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1337 dp->b_bcount = bp->b_resid; 1338 1339 /* 1340 * figure trk given blkno 1341 */ 1342 trk = dp->b_blkno / sc->nsectors; 1343 #ifdef DEBUG 1344 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1345 panic("fdcont: confused"); 1346 #endif 1347 if (dp->b_flags & B_READ) 1348 write = 0; 1349 else 1350 write = 1; 1351 /* 1352 * if we will be overwriting the entire cache, don't bother to 1353 * fetch it. 1354 */ 1355 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1356 if (sc->flags & FDF_DIRTY) 1357 sc->flags |= FDF_JUSTFLUSH; 1358 else { 1359 sc->cachetrk = trk; 1360 fddone(sc); 1361 return; 1362 } 1363 } 1364 /* 1365 * start dma read of `trk' 1366 */ 1367 fddmastart(sc, trk); 1368 return; 1369 } 1370 1371 void 1372 fddmastart(sc, trk) 1373 struct fd_softc *sc; 1374 int trk; 1375 { 1376 int adkmask, ndmaw, write, dmatrk; 1377 1378 #ifdef FDDEBUG 1379 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1380 trk / FDNHEADS, trk % FDNHEADS); 1381 #endif 1382 /* 1383 * flush the cached track if dirty else read requested track. 1384 */ 1385 if (sc->flags & FDF_DIRTY) { 1386 fdcachetoraw(sc); 1387 ndmaw = sc->type->nwritew; 1388 dmatrk = sc->cachetrk; 1389 write = 1; 1390 } else { 1391 ndmaw = sc->type->nreadw; 1392 dmatrk = trk; 1393 write = 0; 1394 } 1395 1396 #ifdef FDDEBUG 1397 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1398 #endif 1399 sc->cachetrk = trk; 1400 fdc_indma = sc; 1401 fdsetpos(sc, dmatrk, write); 1402 1403 /* 1404 * setup dma stuff 1405 */ 1406 if (write == 0) { 1407 custom.adkcon = ADKF_MSBSYNC; 1408 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1409 custom.dsksync = FDMFMSYNC; 1410 } else { 1411 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1412 ADKF_MSBSYNC; 1413 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1414 if (dmatrk >= sc->type->precomp[0]) 1415 adkmask |= ADKF_PRECOMP0; 1416 if (dmatrk >= sc->type->precomp[1]) 1417 adkmask |= ADKF_PRECOMP1; 1418 custom.adkcon = adkmask; 1419 } 1420 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1421 1422 /* 1423 * If writing an MSDOS track, activate disk index pulse 1424 * interrupt, dma will be started in the intr routine fdidxintr() 1425 * Otherwise, start the DMA here. 1426 */ 1427 if (write && sc->openpart == FDMSDOSPART) { 1428 fdc_dmalen = ndmaw; 1429 fdc_dmawrite = write; 1430 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1431 } else { 1432 FDDMASTART(ndmaw, write); 1433 fdc_dmalen = 0; 1434 } 1435 1436 #ifdef FDDEBUG 1437 printf(" dma started\n"); 1438 #endif 1439 } 1440 1441 /* 1442 * recalibrate the drive 1443 */ 1444 void 1445 fdcalibrate(arg) 1446 void *arg; 1447 { 1448 struct fd_softc *sc; 1449 static int loopcnt; 1450 1451 sc = arg; 1452 1453 if (loopcnt == 0) { 1454 /* 1455 * seek cyl 0 1456 */ 1457 fdc_indma = sc; 1458 sc->stepdelay += 900; 1459 if (sc->cachetrk > 1) 1460 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1461 sc->stepdelay -= 900; 1462 } 1463 if (loopcnt++ & 1) 1464 fdsetpos(sc, sc->cachetrk, 0); 1465 else 1466 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1467 /* 1468 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1469 */ 1470 if (loopcnt < 8) 1471 timeout(fdcalibrate, sc, hz / 8); 1472 else { 1473 loopcnt = 0; 1474 fdc_indma = NULL; 1475 timeout(fdmotoroff, sc, 3 * hz / 2); 1476 fddmastart(sc, sc->cachetrk); 1477 } 1478 } 1479 1480 void 1481 fddmadone(sc, timeo) 1482 struct fd_softc *sc; 1483 int timeo; 1484 { 1485 #ifdef FDDEBUG 1486 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1487 #endif 1488 fdc_indma = NULL; 1489 untimeout(fdmotoroff, sc); 1490 FDDMASTOP; 1491 1492 /* 1493 * guarantee the drive has been at current head and cyl 1494 * for at least FDWRITEDELAY after a write. 1495 */ 1496 if (sc->flags & FDF_WRITEWAIT) { 1497 delay(FDWRITEDELAY); 1498 sc->flags &= ~FDF_WRITEWAIT; 1499 } 1500 1501 if ((sc->flags & FDF_MOTOROFF) == 0) { 1502 /* 1503 * motor runs for 1.5 seconds after last dma 1504 */ 1505 timeout(fdmotoroff, sc, 3 * hz / 2); 1506 } 1507 if (sc->flags & FDF_DIRTY) { 1508 /* 1509 * if buffer dirty, the last dma cleaned it 1510 */ 1511 sc->flags &= ~FDF_DIRTY; 1512 if (timeo) 1513 printf("%s: write of track cache timed out.\n", 1514 sc->sc_dv.dv_xname); 1515 if (sc->flags & FDF_JUSTFLUSH) { 1516 sc->flags &= ~FDF_JUSTFLUSH; 1517 /* 1518 * we are done dma'ing 1519 */ 1520 fddone(sc); 1521 return; 1522 } 1523 /* 1524 * load the cache 1525 */ 1526 fddmastart(sc, sc->cachetrk); 1527 return; 1528 } 1529 #ifdef FDDEBUG 1530 else if (sc->flags & FDF_MOTOROFF) 1531 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1532 #endif 1533 1534 /* 1535 * cache loaded decode it into cache buffer 1536 */ 1537 if (timeo == 0 && fdrawtocache(sc) == 0) 1538 sc->retried = 0; 1539 else { 1540 #ifdef FDDEBUG 1541 if (timeo) 1542 printf("%s: fddmadone: cache load timed out.\n", 1543 sc->sc_dv.dv_xname); 1544 #endif 1545 if (sc->retried >= sc->retries) { 1546 sc->retried = 0; 1547 sc->cachetrk = -1; 1548 } else { 1549 sc->retried++; 1550 /* 1551 * this will be restarted at end of calibrate loop. 1552 */ 1553 untimeout(fdmotoroff, sc); 1554 fdcalibrate(sc); 1555 return; 1556 } 1557 } 1558 fddone(sc); 1559 } 1560 1561 void 1562 fddone(sc) 1563 struct fd_softc *sc; 1564 { 1565 struct buf *dp, *bp; 1566 char *data; 1567 int sz; 1568 1569 #ifdef FDDEBUG 1570 printf("fddone: unit %d\n", sc->hwunit); 1571 #endif 1572 /* 1573 * check to see if unit is just flushing the cache, 1574 * that is we have no io queued. 1575 */ 1576 if (sc->flags & FDF_MOTOROFF) 1577 goto nobuf; 1578 1579 dp = &sc->curbuf; 1580 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) 1581 panic ("fddone"); 1582 /* 1583 * check for an error that may have occured 1584 * while getting the track. 1585 */ 1586 if (sc->cachetrk == -1) { 1587 sc->retried = 0; 1588 bp->b_flags |= B_ERROR; 1589 bp->b_error = EIO; 1590 } else if ((bp->b_flags & B_ERROR) == 0) { 1591 data = sc->cachep; 1592 /* 1593 * get offset of data in track cache and limit 1594 * the copy size to not exceed the cache's end. 1595 */ 1596 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1597 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1598 sz *= FDSECSIZE; 1599 sz = min(dp->b_bcount, sz); 1600 if (bp->b_flags & B_READ) 1601 bcopy(data, dp->b_data, sz); 1602 else { 1603 bcopy(dp->b_data, data, sz); 1604 sc->flags |= FDF_DIRTY; 1605 } 1606 bp->b_resid = dp->b_bcount - sz; 1607 if (bp->b_resid == 0) { 1608 bp->b_error = 0; 1609 } else { 1610 /* 1611 * not done yet need to read next track 1612 */ 1613 fdcont(sc); 1614 return; 1615 } 1616 } 1617 /* 1618 * remove from queue. 1619 */ 1620 BUFQ_REMOVE(&sc->bufq, bp); 1621 1622 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1623 1624 biodone(bp); 1625 nobuf: 1626 fdfindwork(sc->sc_dv.dv_unit); 1627 } 1628 1629 void 1630 fdfindwork(unit) 1631 int unit; 1632 { 1633 struct fd_softc *ssc, *sc; 1634 int i, last; 1635 1636 /* 1637 * first see if we have any fdopen()'s waiting 1638 */ 1639 if (fdc_wantwakeup) { 1640 wakeup(fdopen); 1641 fdc_wantwakeup--; 1642 return; 1643 } 1644 1645 /* 1646 * start next available unit, linear search from the next unit 1647 * wrapping and finally this unit. 1648 */ 1649 last = 0; 1650 ssc = NULL; 1651 for (i = unit + 1; last == 0; i++) { 1652 if (i == unit) 1653 last = 1; 1654 if (i >= fd_cd.cd_ndevs) { 1655 i = -1; 1656 continue; 1657 } 1658 if ((sc = fd_cd.cd_devs[i]) == NULL) 1659 continue; 1660 1661 /* 1662 * if unit has requested to be turned off 1663 * and it has no buf's queued do it now 1664 */ 1665 if (sc->flags & FDF_MOTOROFF) { 1666 if (BUFQ_FIRST(&sc->bufq) == NULL) 1667 fdmotoroff(sc); 1668 else { 1669 /* 1670 * we gained a buf request while 1671 * we waited, forget the motoroff 1672 */ 1673 sc->flags &= ~FDF_MOTOROFF; 1674 } 1675 /* 1676 * if we now have dma unit must have needed 1677 * flushing, quit 1678 */ 1679 if (fdc_indma) 1680 return; 1681 } 1682 /* 1683 * if we have no start unit and the current unit has 1684 * io waiting choose this unit to start. 1685 */ 1686 if (ssc == NULL && BUFQ_FIRST(&sc->bufq) != NULL) 1687 ssc = sc; 1688 } 1689 if (ssc) 1690 fdstart(ssc); 1691 } 1692 1693 /* 1694 * min byte count to whats left of the track in question 1695 */ 1696 void 1697 fdminphys(bp) 1698 struct buf *bp; 1699 { 1700 struct fd_softc *sc; 1701 int trk, sec, toff, tsz; 1702 1703 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1704 panic("fdminphys: couldn't get softc"); 1705 1706 trk = bp->b_blkno / sc->nsectors; 1707 sec = bp->b_blkno % sc->nsectors; 1708 1709 toff = sec * FDSECSIZE; 1710 tsz = sc->nsectors * FDSECSIZE; 1711 #ifdef FDDEBUG 1712 printf("fdminphys: before %d", bp->b_bcount); 1713 #endif 1714 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1715 #ifdef FDDEBUG 1716 printf(" after %d\n", bp->b_bcount); 1717 #endif 1718 minphys(bp); 1719 } 1720 1721 /* 1722 * encode the track cache into raw MFM ready for dma 1723 * when we go to multiple disk formats, this will call type dependent 1724 * functions 1725 */ 1726 void fdcachetoraw(sc) 1727 struct fd_softc *sc; 1728 { 1729 if (sc->openpart == FDMSDOSPART) 1730 mscachetoraw(sc); 1731 else 1732 amcachetoraw(sc); 1733 } 1734 1735 /* 1736 * decode raw MFM from dma into units track cache. 1737 * when we go to multiple disk formats, this will call type dependent 1738 * functions 1739 */ 1740 int 1741 fdrawtocache(sc) 1742 struct fd_softc *sc; 1743 { 1744 1745 if (sc->openpart == FDMSDOSPART) 1746 return(msrawtocache(sc)); 1747 else 1748 return(amrawtocache(sc)); 1749 } 1750 1751 void 1752 amcachetoraw(sc) 1753 struct fd_softc *sc; 1754 { 1755 static u_long mfmnull[4]; 1756 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1757 int sec, i; 1758 1759 rp = fdc_dmap; 1760 1761 /* 1762 * not yet one sector (- 1 long) gap. 1763 * for now use previous drivers values 1764 */ 1765 for (i = 0; i < sc->type->gap; i++) 1766 *rp++ = 0xaaaaaaaa; 1767 /* 1768 * process sectors 1769 */ 1770 dp = sc->cachep; 1771 zero = 0; 1772 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1773 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1774 hcksum = dcksum = 0; 1775 /* 1776 * sector format 1777 * offset description 1778 *----------------------------------- 1779 * 0 null 1780 * 1 sync 1781 * oddbits evenbits 1782 *---------------------- 1783 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1784 * 4-7 8-11 null 1785 * 12 13 header cksum [2-11] 1786 * 14 15 data cksum [16-271] 1787 * 16-143 144-271 data 1788 */ 1789 *rp = 0xaaaaaaaa; 1790 if (*(rp - 1) & 0x1) 1791 *rp &= 0x7fffffff; /* clock bit correction */ 1792 rp++; 1793 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1794 rp = mfmblkencode(&info, rp, &hcksum, 1); 1795 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1796 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1797 1798 crp = rp; 1799 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1800 dp += FDSECLWORDS; 1801 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1802 if (*(crp - 1) & 0x1) 1803 *crp &= 0x7fffffff; /* clock bit correction */ 1804 else if ((*crp & 0x40000000) == 0) 1805 *crp |= 0x80000000; 1806 } 1807 *rp = 0xaaa80000; 1808 if (*(rp - 1) & 0x1) 1809 *rp &= 0x7fffffff; 1810 } 1811 1812 u_long * 1813 fdfindsync(rp, ep) 1814 u_long *rp, *ep; 1815 { 1816 u_short *sp; 1817 1818 sp = (u_short *)rp; 1819 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1820 sp++; 1821 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1822 sp++; 1823 if ((u_long *)sp < ep) 1824 return((u_long *)sp); 1825 return(NULL); 1826 } 1827 1828 int 1829 amrawtocache(sc) 1830 struct fd_softc *sc; 1831 { 1832 u_long mfmnull[4]; 1833 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1834 int cnt, doagain; 1835 1836 doagain = 1; 1837 srp = rp = fdc_dmap; 1838 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1839 cnt = 0; 1840 again: 1841 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1842 #ifdef DIAGNOSTIC 1843 printf("%s: corrupted track (%d) data.\n", 1844 sc->sc_dv.dv_xname, sc->cachetrk); 1845 #endif 1846 return(-1); 1847 } 1848 1849 /* 1850 * process sectors 1851 */ 1852 for (; cnt < sc->nsectors; cnt++) { 1853 hcksum = dcksum = 0; 1854 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1855 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1856 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1857 if (cktmp != hcksum) { 1858 #ifdef FDDEBUG 1859 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1860 info, hcksum, cktmp); 1861 #endif 1862 goto again; 1863 } 1864 if (((info >> 16) & 0xff) != sc->cachetrk) { 1865 #ifdef DEBUG 1866 printf("%s: incorrect track found: 0x%lx %d\n", 1867 sc->sc_dv.dv_xname, info, sc->cachetrk); 1868 #endif 1869 goto again; 1870 } 1871 #ifdef FDDEBUG 1872 printf(" info 0x%x\n", info); 1873 #endif 1874 1875 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1876 dp = sc->cachep; 1877 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1878 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1879 if (cktmp != dcksum) { 1880 #ifdef FDDEBUG 1881 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1882 info, dcksum, cktmp); 1883 #endif 1884 goto again; 1885 } 1886 1887 /* 1888 * if we are at gap then we can no longer be sure 1889 * of correct sync marks 1890 */ 1891 if ((info && 0xff) == 1) 1892 doagain = 1; 1893 else 1894 doagain = 0; 1895 srp = rp = fdfindsync(crp, erp); 1896 } 1897 return(0); 1898 } 1899 1900 void 1901 mscachetoraw(sc) 1902 struct fd_softc *sc; 1903 { 1904 u_short *rp, *erp, crc; 1905 u_char *cp, tb[5]; 1906 int sec, i; 1907 1908 rp = (u_short *)fdc_dmap; 1909 erp = rp + sc->type->nwritew; 1910 cp = sc->cachep; 1911 1912 /* 1913 * initial track filler (828 * GAP1) 1914 */ 1915 for (i = 0; i < sc->type->gap; i++) { 1916 *rp++ = FDMFMGAP1; 1917 *rp++ = FDMFMGAP1; 1918 } 1919 1920 for (sec = 0; sec < sc->nsectors; sec++) { 1921 1922 /* 1923 * leading sector gap 1924 * (12 * GAP2) + (3 * SYNC) 1925 */ 1926 for (i = 0; i < 12; i++) 1927 *rp++ = FDMFMGAP2; 1928 *rp++ = FDMFMSYNC; 1929 *rp++ = FDMFMSYNC; 1930 *rp++ = FDMFMSYNC; 1931 1932 /* 1933 * sector information 1934 * (ID) + track + side + sector + sector size + CRC16 1935 */ 1936 *rp++ = FDMFMID; 1937 tb[0] = sc->cachetrk / FDNHEADS; 1938 tb[1] = sc->cachetrk % FDNHEADS; 1939 tb[2] = sec + 1; 1940 i = sc->bytespersec; 1941 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1942 rp = msblkencode(rp, tb, 4, &crc); 1943 tb[0] = crc >> 8; 1944 tb[1] = crc & 0xff; 1945 tb[2] = 0x4e; /* GAP1 decoded */ 1946 rp = msblkencode(rp, tb, 3, 0); 1947 1948 /* 1949 * sector info/data gap 1950 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1951 */ 1952 for (i = 0; i < 21; i++) 1953 *rp++ = FDMFMGAP1; 1954 for (i = 0; i < 12; i++) 1955 *rp++ = FDMFMGAP2; 1956 *rp++ = FDMFMSYNC; 1957 *rp++ = FDMFMSYNC; 1958 *rp++ = FDMFMSYNC; 1959 1960 /* 1961 * sector data 1962 * (DATA) + ...data... + CRC16 1963 */ 1964 *rp++ = FDMFMDATA; 1965 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1966 cp += sc->bytespersec; 1967 tb[0] = crc >> 8; 1968 tb[1] = crc & 0xff; 1969 tb[2] = 0x4e; /* GAP3 decoded */ 1970 rp = msblkencode(rp, tb, 3, 0); 1971 1972 /* 1973 * trailing sector gap 1974 * (80 * GAP3) 1975 */ 1976 for (i = 0; i < 79; i++) 1977 *rp++ = FDMFMGAP3; 1978 } 1979 1980 /* 1981 * fill rest of track with GAP3 1982 */ 1983 while (rp != erp) 1984 *rp++ = FDMFMGAP3; 1985 1986 } 1987 1988 int 1989 msrawtocache(sc) 1990 struct fd_softc *sc; 1991 { 1992 u_short *rp, *srp, *erp; 1993 u_char tb[5], *cp; 1994 int ct, sec, retry; 1995 1996 srp = rp = (u_short *)fdc_dmap; 1997 erp = rp + sc->type->nreadw; 1998 cp = sc->cachep; 1999 2000 for (ct = 0; ct < sc->nsectors; ct++) { 2001 retry = 1; 2002 do { 2003 /* 2004 * skip leading gap to sync 2005 */ 2006 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 2007 #ifdef DIAGNOSTIC 2008 printf("%s: corrupted track (%d) data.\n", 2009 sc->sc_dv.dv_xname, sc->cachetrk); 2010 #endif 2011 return(-1); 2012 } 2013 2014 /* 2015 * Grab sector info 2016 */ 2017 if (*rp++ != FDMFMID) 2018 continue; 2019 rp = msblkdecode(rp, tb, 4); 2020 #ifdef FDDEBUG 2021 printf("sector id: sector %d, track %d, side %d," 2022 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 2023 #endif 2024 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 2025 tb[2] > sc->nsectors) 2026 continue; 2027 2028 sec = tb[2]; 2029 sc->bytespersec = 128 << tb[3]; 2030 rp += 2; /* skip CRC-16 */ 2031 2032 /* 2033 * skip gap and read in data 2034 */ 2035 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 2036 return(-1); 2037 if (*rp++ != FDMFMDATA) 2038 continue; 2039 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 2040 sc->bytespersec); 2041 rp += 2; /* skip CRC-16 */ 2042 2043 retry = 0; 2044 } while (retry); 2045 } 2046 return(0); 2047 } 2048 2049 /* 2050 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2051 * this format specified that the odd bits are at current pos and even 2052 * bits at len + current pos 2053 */ 2054 u_long * 2055 mfmblkencode(dp, rp, cp, len) 2056 u_long *dp, *rp, *cp; 2057 int len; 2058 { 2059 u_long *sdp, *edp, d, dtmp, correct; 2060 2061 sdp = dp; 2062 edp = dp + len; 2063 2064 if (*(rp - 1) & 0x1) 2065 correct = 1; 2066 else 2067 correct = 0; 2068 /* 2069 * do odd bits 2070 */ 2071 while (dp < edp) { 2072 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2073 dtmp = d ^ 0x55555555; 2074 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2075 /* 2076 * correct upper clock bit if needed 2077 */ 2078 if (correct) 2079 d &= 0x7fffffff; 2080 if (d & 0x1) 2081 correct = 1; 2082 else 2083 correct = 0; 2084 /* 2085 * do checksums and store in raw buffer 2086 */ 2087 if (cp) 2088 *cp ^= d; 2089 *rp++ = d; 2090 dp++; 2091 } 2092 /* 2093 * do even bits 2094 */ 2095 dp = sdp; 2096 while (dp < edp) { 2097 d = *dp & 0x55555555; /* remove clock bits */ 2098 dtmp = d ^ 0x55555555; 2099 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2100 /* 2101 * correct upper clock bit if needed 2102 */ 2103 if (correct) 2104 d &= 0x7fffffff; 2105 if (d & 0x1) 2106 correct = 1; 2107 else 2108 correct = 0; 2109 /* 2110 * do checksums and store in raw buffer 2111 */ 2112 if (cp) 2113 *cp ^= d; 2114 *rp++ = d; 2115 dp++; 2116 } 2117 if (cp) 2118 *cp &= 0x55555555; 2119 return(rp); 2120 } 2121 2122 /* 2123 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2124 * this format specified that the odd bits are at current pos and even 2125 * bits at len + current pos 2126 */ 2127 u_long * 2128 mfmblkdecode(rp, dp, cp, len) 2129 u_long *rp, *dp, *cp; 2130 int len; 2131 { 2132 u_long o, e; 2133 int cnt; 2134 2135 cnt = len; 2136 while (cnt--) { 2137 o = *rp; 2138 e = *(rp + len); 2139 if (cp) { 2140 *cp ^= o; 2141 *cp ^= e; 2142 } 2143 o &= 0x55555555; 2144 e &= 0x55555555; 2145 *dp++ = (o << 1) | e; 2146 rp++; 2147 } 2148 if (cp) 2149 *cp &= 0x55555555; 2150 return(rp + len); 2151 } 2152 2153 /* 2154 * decode len words in standard MFM format to len bytes 2155 * of data. 2156 */ 2157 u_short * 2158 msblkdecode(rp, cp, len) 2159 u_short *rp; 2160 u_char *cp; 2161 int len; 2162 { 2163 while (len--) { 2164 *cp++ = msdecode[*rp & 0x7f] | 2165 (msdecode[(*rp >> 8) & 0x7f] << 4); 2166 rp++; 2167 } 2168 2169 return(rp); 2170 } 2171 2172 /* 2173 * encode len bytes of data into len words in standard MFM format. 2174 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2175 * as well. 2176 */ 2177 u_short * 2178 msblkencode(rp, cp, len, crc) 2179 u_short *rp; 2180 u_char *cp; 2181 int len; 2182 u_short *crc; 2183 { 2184 u_short td; 2185 u_short mycrc; 2186 2187 /* preload crc for header (4 bytes) 2188 * or data (anything else) 2189 */ 2190 mycrc = (len == 4) ? 0xb230 : 0xe295; 2191 2192 while (len--) { 2193 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2194 2195 /* Check for zeros in top bit of encode and bottom 2196 * bit of previous encode. if so, slap a one in betweem 2197 * them. 2198 */ 2199 if ((td & 0x140) == 0) 2200 td |= 0x80; 2201 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2202 td |= 0x8000; 2203 2204 *rp++ = td; 2205 2206 /* 2207 * calc crc if requested 2208 */ 2209 if (crc) 2210 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2211 2212 cp++; 2213 } 2214 2215 if (crc) 2216 *crc = mycrc; 2217 2218 return(rp); 2219 } 2220 2221 int 2222 fddump(dev, blkno, va, size) 2223 dev_t dev; 2224 daddr_t blkno; 2225 caddr_t va; 2226 size_t size; 2227 { 2228 return (EINVAL); 2229 } 2230
Indexes created Thu Oct 02 14:10:14 GMT 2025