fd.c revision 1.46
1 /* $NetBSD: fd.c,v 1.46 2000/11/20 08:24:09 chs 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/callout.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <sys/buf.h> 40 #include <sys/device.h> 41 #include <sys/ioctl.h> 42 #include <sys/fcntl.h> 43 #include <sys/disklabel.h> 44 #include <sys/disk.h> 45 #include <sys/dkbad.h> 46 #include <sys/proc.h> 47 #include <machine/cpu.h> 48 #include <amiga/amiga/device.h> 49 #include <amiga/amiga/custom.h> 50 #include <amiga/amiga/cia.h> 51 #include <amiga/amiga/cc.h> 52 53 #include <sys/conf.h> 54 #include <machine/conf.h> 55 56 #include "locators.h" 57 58 enum fdc_bits { FDB_CHANGED = 2, FDB_PROTECT, FDB_CYLZERO, FDB_READY }; 59 /* 60 * partitions in fd represent different format floppies 61 * partition a is 0 etc.. 62 */ 63 enum fd_parttypes { 64 FDAMIGAPART = 0, 65 FDMSDOSPART, 66 FDMAXPARTS 67 }; 68 69 #define FDBBSIZE (8192) 70 #define FDSBSIZE (8192) 71 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_queue bufq; /* queue pending I/O operations */ 146 struct buf curbuf; /* state of current I/O operation */ 147 struct callout calibrate_ch; 148 struct callout motor_ch; 149 struct fdtype *type; 150 void *cachep; /* cached track data (write through) */ 151 int cachetrk; /* cahced track -1 for none */ 152 int hwunit; /* unit for amiga controlling hw */ 153 int unitmask; /* mask for cia select deslect */ 154 int pstepdir; /* previous step direction */ 155 int curcyl; /* current curcyl head positioned on */ 156 int flags; /* misc flags */ 157 int wlabel; 158 int stepdelay; /* useq to delay after seek user setable */ 159 int nsectors; /* number of sectors per track */ 160 int openpart; /* which partition [ab] == [12] is open */ 161 short retries; /* number of times to retry failed io */ 162 short retried; /* number of times current io retried */ 163 int bytespersec; /* number of bytes per sector */ 164 }; 165 166 /* fd_softc->flags */ 167 #define FDF_MOTORON (0x01) /* motor is running */ 168 #define FDF_MOTOROFF (0x02) /* motor is waiting to be turned off */ 169 #define FDF_WMOTOROFF (0x04) /* unit wants a wakeup after off */ 170 #define FDF_DIRTY (0x08) /* track cache needs write */ 171 #define FDF_WRITEWAIT (0x10) /* need to head select delay on next setpos */ 172 #define FDF_HAVELABEL (0x20) /* label is valid */ 173 #define FDF_JUSTFLUSH (0x40) /* don't bother caching track. */ 174 #define FDF_NOTRACK0 (0x80) /* was not able to recalibrate drive */ 175 176 int fdc_wantwakeup; 177 int fdc_side; 178 void *fdc_dmap; 179 struct fd_softc *fdc_indma; 180 int fdc_dmalen; 181 int fdc_dmawrite; 182 183 struct fdcargs { 184 struct fdtype *type; 185 int unit; 186 }; 187 188 int fdcmatch __P((struct device *, struct cfdata *, void *)); 189 void fdcattach __P((struct device *, struct device *, void *)); 190 int fdcprint __P((void *, const char *)); 191 int fdmatch __P((struct device *, struct cfdata *, void *)); 192 void fdattach __P((struct device *, struct device *, void *)); 193 194 void fdintr __P((int)); 195 void fdidxintr __P((void)); 196 void fdstrategy __P((struct buf *)); 197 int fdloaddisk __P((struct fd_softc *)); 198 void fdgetdefaultlabel __P((struct fd_softc *, struct disklabel *, int)); 199 int fdgetdisklabel __P((struct fd_softc *, dev_t)); 200 int fdsetdisklabel __P((struct fd_softc *, struct disklabel *)); 201 int fdputdisklabel __P((struct fd_softc *, dev_t)); 202 struct fdtype * fdcgetfdtype __P((int)); 203 void fdmotoroff __P((void *)); 204 void fdsetpos __P((struct fd_softc *, int, int)); 205 void fdselunit __P((struct fd_softc *)); 206 void fdstart __P((struct fd_softc *)); 207 void fdcont __P((struct fd_softc *)); 208 void fddmastart __P((struct fd_softc *, int)); 209 void fdcalibrate __P((void *)); 210 void fddmadone __P((struct fd_softc *, int)); 211 void fddone __P((struct fd_softc *)); 212 void fdfindwork __P((int)); 213 void fdminphys __P((struct buf *)); 214 void fdcachetoraw __P((struct fd_softc *)); 215 void amcachetoraw __P((struct fd_softc *)); 216 int amrawtocache __P((struct fd_softc *)); 217 u_long *fdfindsync __P((u_long *, u_long *)); 218 int fdrawtocache __P((struct fd_softc *)); 219 void mscachetoraw __P((struct fd_softc *)); 220 int msrawtocache __P((struct fd_softc *)); 221 u_long *mfmblkencode __P((u_long *, u_long *, u_long *, int)); 222 u_long *mfmblkdecode __P((u_long *, u_long *, u_long *, int)); 223 u_short *msblkdecode __P((u_short *, u_char *, int)); 224 u_short *msblkencode __P((u_short *, u_char *, int, u_short *)); 225 226 struct dkdriver fddkdriver = { fdstrategy }; 227 228 /* 229 * read size is (nsectors + 1) * mfm secsize + gap bytes + 2 shorts 230 * write size is nsectors * mfm secsize + gap bytes + 3 shorts 231 * the extra shorts are to deal with a dma hw bug in the controller 232 * they are probably too much (I belive the bug is 1 short on write and 233 * 3 bits on read) but there is no need to be cheap here. 234 */ 235 #define MAXTRKSZ (22 * FDSECSIZE) 236 struct fdtype fdtype[] = { 237 { 0x00000000, 80, 11, 9, 7358, 6815, 414, { 80, 161 }, "3.5dd" }, 238 { 0x55555555, 40, 11, 9, 7358, 6815, 414, { 80, 161 }, "5.25dd" }, 239 { 0xAAAAAAAA, 80, 22, 18, 14716, 13630, 828, { 80, 161 }, "3.5hd" } 240 }; 241 int nfdtype = sizeof(fdtype) / sizeof(*fdtype); 242 243 struct cfattach fd_ca = { 244 sizeof(struct fd_softc), fdmatch, fdattach 245 }; 246 247 extern struct cfdriver fd_cd; 248 249 struct cfattach fdc_ca = { 250 sizeof(struct device), fdcmatch, fdcattach 251 }; 252 253 /* 254 * all hw access through macros, this helps to hide the active low 255 * properties 256 */ 257 258 #define FDUNITMASK(unit) (1 << (3 + (unit))) 259 260 /* 261 * select units using mask 262 */ 263 #define FDSELECT(um) do { ciab.prb &= ~(um); } while (0) 264 265 /* 266 * deselect units using mask 267 */ 268 #define FDDESELECT(um) do { ciab.prb |= (um); delay(1); } while (0) 269 270 /* 271 * test hw condition bits 272 */ 273 #define FDTESTC(bit) ((ciaa.pra & (1 << (bit))) == 0) 274 275 /* 276 * set motor for select units, true motor on else off 277 */ 278 #define FDSETMOTOR(on) do { \ 279 if (on) ciab.prb &= ~CIAB_PRB_MTR; else ciab.prb |= CIAB_PRB_MTR; \ 280 } while (0) 281 282 /* 283 * set head for select units 284 */ 285 #define FDSETHEAD(head) do { \ 286 if (head) ciab.prb &= ~CIAB_PRB_SIDE; else ciab.prb |= CIAB_PRB_SIDE; \ 287 delay(1); } while (0) 288 289 /* 290 * select direction, true towards spindle else outwards 291 */ 292 #define FDSETDIR(in) do { \ 293 if (in) ciab.prb &= ~CIAB_PRB_DIR; else ciab.prb |= CIAB_PRB_DIR; \ 294 delay(1); } while (0) 295 296 /* 297 * step the selected units 298 */ 299 #define FDSTEP do { \ 300 ciab.prb &= ~CIAB_PRB_STEP; ciab.prb |= CIAB_PRB_STEP; \ 301 } while (0) 302 303 #define FDDMASTART(len, towrite) do { \ 304 int dmasz = (len) | ((towrite) ? DISKLEN_WRITE : 0) | DISKLEN_DMAEN; \ 305 custom.dsklen = dmasz; custom.dsklen = dmasz; } while (0) 306 307 #define FDDMASTOP do { custom.dsklen = 0; } while (0) 308 309 310 int 311 fdcmatch(pdp, cfp, auxp) 312 struct device *pdp; 313 struct cfdata *cfp; 314 void *auxp; 315 { 316 static int fdc_matched = 0; 317 318 /* Allow only once instance. */ 319 if (matchname("fdc", auxp) == 0 || fdc_matched) 320 return(0); 321 if ((fdc_dmap = alloc_chipmem(DMABUFSZ)) == NULL) { 322 printf("fdc: unable to allocate dma buffer\n"); 323 return(0); 324 } 325 326 fdc_matched = 1; 327 return(1); 328 } 329 330 void 331 fdcattach(pdp, dp, auxp) 332 struct device *pdp, *dp; 333 void *auxp; 334 { 335 struct fdcargs args; 336 337 printf(": dmabuf pa 0x%x", kvtop(fdc_dmap)); 338 printf(": dmabuf ka %p\n", fdc_dmap); 339 args.unit = 0; 340 args.type = fdcgetfdtype(args.unit); 341 342 fdc_side = -1; 343 config_found(dp, &args, fdcprint); 344 for (args.unit++; args.unit < FDMAXUNITS; args.unit++) { 345 if ((args.type = fdcgetfdtype(args.unit)) == NULL) 346 continue; 347 config_found(dp, &args, fdcprint); 348 } 349 } 350 351 int 352 fdcprint(auxp, pnp) 353 void *auxp; 354 const char *pnp; 355 { 356 struct fdcargs *fcp; 357 358 fcp = auxp; 359 if (pnp) 360 printf("fd%d at %s unit %d:", fcp->unit, pnp, 361 fcp->type->driveid); 362 return(UNCONF); 363 } 364 365 /*ARGSUSED*/ 366 int 367 fdmatch(pdp, cfp, auxp) 368 struct device *pdp; 369 struct cfdata *cfp; 370 void *auxp; 371 { 372 struct fdcargs *fdap; 373 374 fdap = auxp; 375 if (cfp->cf_loc[FDCCF_UNIT] == fdap->unit || 376 cfp->cf_loc[FDCCF_UNIT] == FDCCF_UNIT_DEFAULT) 377 return(1); 378 379 return(0); 380 } 381 382 void 383 fdattach(pdp, dp, auxp) 384 struct device *pdp, *dp; 385 void *auxp; 386 { 387 struct fdcargs *ap; 388 struct fd_softc *sc; 389 int i; 390 391 ap = auxp; 392 sc = (struct fd_softc *)dp; 393 394 BUFQ_INIT(&sc->bufq); 395 callout_init(&sc->calibrate_ch); 396 callout_init(&sc->motor_ch); 397 398 sc->curcyl = sc->cachetrk = -1; 399 sc->openpart = -1; 400 sc->type = ap->type; 401 sc->hwunit = ap->unit; 402 sc->unitmask = 1 << (3 + ap->unit); 403 sc->retries = FDRETRIES; 404 sc->stepdelay = FDSTEPDELAY; 405 sc->bytespersec = 512; 406 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 407 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 408 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 409 410 /* 411 * Initialize and attach the disk structure. 412 */ 413 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 414 sc->dkdev.dk_driver = &fddkdriver; 415 disk_attach(&sc->dkdev); 416 417 /* 418 * calibrate the drive 419 */ 420 fdsetpos(sc, 0, 0); 421 fdsetpos(sc, sc->type->ncylinders, 0); 422 fdsetpos(sc, 0, 0); 423 fdmotoroff(sc); 424 425 /* 426 * precalc msdos MFM and CRC 427 */ 428 for (i = 0; i < 128; i++) 429 msdecode[i] = 0xff; 430 for (i = 0; i < 16; i++) 431 msdecode[msencode[i]] = i; 432 for (i = 0; i < 256; i++) { 433 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 434 (0x1021 * (i >> 4)); 435 } 436 437 /* 438 * enable disk related interrupts 439 */ 440 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 441 custom.intena = INTF_SETCLR | INTF_DSKBLK; 442 ciab.icr = CIA_ICR_FLG; 443 } 444 445 /*ARGSUSED*/ 446 int 447 fdopen(dev, flags, devtype, p) 448 dev_t dev; 449 int flags, devtype; 450 struct proc *p; 451 { 452 struct fd_softc *sc; 453 int wasopen, fwork, error, s; 454 455 error = 0; 456 457 if (FDPART(dev) >= FDMAXPARTS) 458 return(ENXIO); 459 460 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 461 return(ENXIO); 462 if (sc->flags & FDF_NOTRACK0) 463 return(ENXIO); 464 if (sc->cachep == NULL) 465 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 466 467 s = splbio(); 468 /* 469 * if we are sleeping in fdclose(); waiting for a chance to 470 * shut the motor off, do a sleep here also. 471 */ 472 while (sc->flags & FDF_WMOTOROFF) 473 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 474 475 fwork = 0; 476 /* 477 * if not open let user open request type, otherwise 478 * ensure they are trying to open same type. 479 */ 480 if (sc->openpart == FDPART(dev)) 481 wasopen = 1; 482 else if (sc->openpart == -1) { 483 sc->openpart = FDPART(dev); 484 wasopen = 0; 485 } else { 486 wasopen = 1; 487 error = EPERM; 488 goto done; 489 } 490 491 /* 492 * wait for current io to complete if any 493 */ 494 if (fdc_indma) { 495 fwork = 1; 496 fdc_wantwakeup++; 497 tsleep(fdopen, PRIBIO, "fdopen", 0); 498 } 499 if ((error = fdloaddisk(sc)) != 0) 500 goto done; 501 if ((error = fdgetdisklabel(sc, dev)) != 0) 502 goto done; 503 #ifdef FDDEBUG 504 printf(" open successful\n"); 505 #endif 506 done: 507 /* 508 * if we requested that fddone()->fdfindwork() wake us, allow it to 509 * complete its job now 510 */ 511 if (fwork) 512 fdfindwork(FDUNIT(dev)); 513 splx(s); 514 515 /* 516 * if we were not open and we marked us so reverse that. 517 */ 518 if (error && wasopen == 0) 519 sc->openpart = -1; 520 return(error); 521 } 522 523 /*ARGSUSED*/ 524 int 525 fdclose(dev, flags, devtype, p) 526 dev_t dev; 527 int flags, devtype; 528 struct proc *p; 529 { 530 struct fd_softc *sc; 531 int s; 532 533 #ifdef FDDEBUG 534 printf("fdclose()\n"); 535 #endif 536 sc = getsoftc(fd_cd, FDUNIT(dev)); 537 s = splbio(); 538 if (sc->flags & FDF_MOTORON) { 539 sc->flags |= FDF_WMOTOROFF; 540 tsleep(fdmotoroff, PRIBIO, "fdclose", 0); 541 sc->flags &= ~FDF_WMOTOROFF; 542 wakeup(fdmotoroff); 543 } 544 sc->openpart = -1; 545 splx(s); 546 return(0); 547 } 548 549 int 550 fdioctl(dev, cmd, addr, flag, p) 551 dev_t dev; 552 u_long cmd; 553 caddr_t addr; 554 int flag; 555 struct proc *p; 556 { 557 struct fd_softc *sc; 558 int error, wlab; 559 560 sc = getsoftc(fd_cd, FDUNIT(dev)); 561 562 if ((sc->flags & FDF_HAVELABEL) == 0) 563 return(EBADF); 564 565 switch (cmd) { 566 case DIOCSBAD: 567 return(EINVAL); 568 case DIOCSRETRIES: 569 if (*(int *)addr < 0) 570 return(EINVAL); 571 sc->retries = *(int *)addr; 572 return(0); 573 case DIOCSSTEP: 574 if (*(int *)addr < FDSTEPDELAY) 575 return(EINVAL); 576 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 577 return(0); 578 case DIOCGDINFO: 579 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 580 return(0); 581 case DIOCGPART: 582 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 583 ((struct partinfo *)addr)->part = 584 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 585 return(0); 586 case DIOCSDINFO: 587 if ((flag & FWRITE) == 0) 588 return(EBADF); 589 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 590 case DIOCWDINFO: 591 if ((flag & FWRITE) == 0) 592 return(EBADF); 593 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 594 return(error); 595 wlab = sc->wlabel; 596 sc->wlabel = 1; 597 error = fdputdisklabel(sc, dev); 598 sc->wlabel = wlab; 599 return(error); 600 case DIOCWLABEL: 601 if ((flag & FWRITE) == 0) 602 return(EBADF); 603 sc->wlabel = *(int *)addr; 604 return(0); 605 case DIOCGDEFLABEL: 606 fdgetdefaultlabel(sc, (struct disklabel *)addr, FDPART(dev)); 607 return(0); 608 default: 609 return(ENOTTY); 610 } 611 } 612 613 /* 614 * no dumps to floppy disks thank you. 615 */ 616 int 617 fdsize(dev) 618 dev_t dev; 619 { 620 return(-1); 621 } 622 623 int 624 fdread(dev, uio, flags) 625 dev_t dev; 626 struct uio *uio; 627 int flags; 628 { 629 return (physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 630 } 631 632 int 633 fdwrite(dev, uio, flags) 634 dev_t dev; 635 struct uio *uio; 636 int flags; 637 { 638 return (physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 639 } 640 641 642 void 643 fdintr(flag) 644 int flag; 645 { 646 int s; 647 648 s = splbio(); 649 if (fdc_indma) 650 fddmadone(fdc_indma, 0); 651 splx(s); 652 } 653 654 void 655 fdidxintr() 656 { 657 if (fdc_indma && fdc_dmalen) { 658 /* 659 * turn off intr and start actual dma 660 */ 661 ciab.icr = CIA_ICR_FLG; 662 FDDMASTART(fdc_dmalen, fdc_dmawrite); 663 fdc_dmalen = 0; 664 } 665 } 666 667 void 668 fdstrategy(bp) 669 struct buf *bp; 670 { 671 struct disklabel *lp; 672 struct fd_softc *sc; 673 int unit, part, s; 674 675 unit = FDUNIT(bp->b_dev); 676 part = FDPART(bp->b_dev); 677 sc = getsoftc(fd_cd, unit); 678 679 #ifdef FDDEBUG 680 printf("fdstrategy: 0x%x\n", bp); 681 #endif 682 /* 683 * check for valid partition and bounds 684 */ 685 lp = sc->dkdev.dk_label; 686 if ((sc->flags & FDF_HAVELABEL) == 0) { 687 bp->b_error = EIO; 688 goto bad; 689 } 690 if (bounds_check_with_label(bp, lp, sc->wlabel) <= 0) 691 goto done; 692 693 /* 694 * trans count of zero or bounds check indicates io is done 695 * we are done. 696 */ 697 if (bp->b_bcount == 0) 698 goto done; 699 700 bp->b_rawblkno = bp->b_blkno; 701 702 /* 703 * queue the buf and kick the low level code 704 */ 705 s = splbio(); 706 disksort_cylinder(&sc->bufq, bp); 707 fdstart(sc); 708 splx(s); 709 return; 710 bad: 711 bp->b_flags |= B_ERROR; 712 done: 713 bp->b_resid = bp->b_bcount; 714 biodone(bp); 715 } 716 717 /* 718 * make sure disk is loaded and label is up-to-date. 719 */ 720 int 721 fdloaddisk(sc) 722 struct fd_softc *sc; 723 { 724 /* 725 * if diskchange is low step drive to 0 then up one then to zero. 726 */ 727 fdselunit(sc); /* make sure the unit is selected */ 728 if (FDTESTC(FDB_CHANGED)) { 729 fdsetpos(sc, 0, 0); 730 sc->cachetrk = -1; /* invalidate the cache */ 731 sc->flags &= ~FDF_HAVELABEL; 732 fdsetpos(sc, FDNHEADS, 0); 733 fdsetpos(sc, 0, 0); 734 if (FDTESTC(FDB_CHANGED)) { 735 fdmotoroff(sc); 736 FDDESELECT(sc->unitmask); 737 return(ENXIO); 738 } 739 } 740 FDDESELECT(sc->unitmask); 741 fdmotoroff(sc); 742 sc->type = fdcgetfdtype(sc->hwunit); 743 if (sc->type == NULL) 744 return(ENXIO); 745 if (sc->openpart == FDMSDOSPART) 746 sc->nsectors = sc->type->msdos_nsectors; 747 else 748 sc->nsectors = sc->type->amiga_nsectors; 749 return(0); 750 } 751 752 void 753 fdgetdefaultlabel(sc, lp, part) 754 struct fd_softc *sc; 755 struct disklabel *lp; 756 int part; /* XXX ick */ 757 { 758 759 bzero(lp, sizeof(struct disklabel)); 760 lp->d_secsize = FDSECSIZE; 761 lp->d_ntracks = FDNHEADS; 762 lp->d_ncylinders = sc->type->ncylinders; 763 lp->d_nsectors = sc->nsectors; 764 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 765 lp->d_type = DTYPE_FLOPPY; 766 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 767 lp->d_rpm = 300; /* good guess I suppose. */ 768 lp->d_interleave = 1; /* should change when adding msdos */ 769 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 770 lp->d_bbsize = 0; 771 lp->d_sbsize = 0; 772 lp->d_partitions[part].p_size = lp->d_secperunit; 773 lp->d_partitions[part].p_fstype = FS_UNUSED; 774 lp->d_partitions[part].p_fsize = 1024; 775 lp->d_partitions[part].p_frag = 8; 776 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 777 lp->d_npartitions = part + 1; 778 lp->d_magic = lp->d_magic2 = DISKMAGIC; 779 lp->d_checksum = dkcksum(lp); 780 } 781 782 /* 783 * read disk label, if present otherwise create one 784 * return a new label if raw part and none found, otherwise err. 785 */ 786 int 787 fdgetdisklabel(sc, dev) 788 struct fd_softc *sc; 789 dev_t dev; 790 { 791 struct disklabel *lp, *dlp; 792 struct cpu_disklabel *clp; 793 struct buf *bp; 794 int error, part; 795 796 if (sc->flags & FDF_HAVELABEL && 797 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 798 return(0); 799 #ifdef FDDEBUG 800 printf("fdgetdisklabel()\n"); 801 #endif 802 part = FDPART(dev); 803 lp = sc->dkdev.dk_label; 804 clp = sc->dkdev.dk_cpulabel; 805 bzero(lp, sizeof(struct disklabel)); 806 bzero(clp, sizeof(struct cpu_disklabel)); 807 808 lp->d_secsize = FDSECSIZE; 809 lp->d_ntracks = FDNHEADS; 810 lp->d_ncylinders = sc->type->ncylinders; 811 lp->d_nsectors = sc->nsectors; 812 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 813 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 814 lp->d_npartitions = part + 1; 815 lp->d_partitions[part].p_size = lp->d_secperunit; 816 lp->d_partitions[part].p_fstype = FS_UNUSED; 817 lp->d_partitions[part].p_fsize = 1024; 818 lp->d_partitions[part].p_frag = 8; 819 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 820 821 sc->flags |= FDF_HAVELABEL; 822 823 bp = (void *)geteblk((int)lp->d_secsize); 824 bp->b_dev = dev; 825 bp->b_blkno = 0; 826 bp->b_cylinder = 0; 827 bp->b_bcount = FDSECSIZE; 828 bp->b_flags |= B_READ; 829 fdstrategy(bp); 830 if ((error = biowait(bp)) != 0) 831 goto nolabel; 832 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 833 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 834 dkcksum(dlp)) { 835 error = EINVAL; 836 goto nolabel; 837 } 838 bcopy(dlp, lp, sizeof(struct disklabel)); 839 if (lp->d_trkseek > FDSTEPDELAY) 840 sc->stepdelay = lp->d_trkseek; 841 brelse(bp); 842 return(0); 843 nolabel: 844 fdgetdefaultlabel(sc, lp, part); 845 brelse(bp); 846 return(0); 847 } 848 849 /* 850 * set the incore copy of this units disklabel 851 */ 852 int 853 fdsetdisklabel(sc, lp) 854 struct fd_softc *sc; 855 struct disklabel *lp; 856 { 857 struct disklabel *clp; 858 struct partition *pp; 859 860 /* 861 * must have at least opened raw unit to fetch the 862 * raw_part stuff. 863 */ 864 if ((sc->flags & FDF_HAVELABEL) == 0) 865 return(EINVAL); 866 clp = sc->dkdev.dk_label; 867 /* 868 * make sure things check out and we only have one valid 869 * partition 870 */ 871 #ifdef FDDEBUG 872 printf("fdsetdisklabel\n"); 873 #endif 874 if (lp->d_secsize != FDSECSIZE || 875 lp->d_nsectors != clp->d_nsectors || 876 lp->d_ntracks != FDNHEADS || 877 lp->d_ncylinders != clp->d_ncylinders || 878 lp->d_secpercyl != clp->d_secpercyl || 879 lp->d_secperunit != clp->d_secperunit || 880 lp->d_magic != DISKMAGIC || 881 lp->d_magic2 != DISKMAGIC || 882 lp->d_npartitions == 0 || 883 lp->d_npartitions > FDMAXPARTS || 884 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 885 dkcksum(lp)) 886 return(EINVAL); 887 /* 888 * if any partitions are present make sure they 889 * represent the currently open type 890 */ 891 if ((pp = &lp->d_partitions[0])->p_size) { 892 if ((pp = &lp->d_partitions[1])->p_size == 0) 893 goto done; 894 else if (sc->openpart != 1) 895 return(EINVAL); 896 } else if (sc->openpart != 0) 897 return(EINVAL); 898 /* 899 * make sure selected partition is within bounds 900 * XXX on the second check, its to handle a bug in 901 * XXX the cluster routines as they require mutliples 902 * XXX of NBPG currently 903 */ 904 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 905 (pp->p_frag * pp->p_fsize % NBPG)) 906 return(EINVAL); 907 done: 908 bcopy(lp, clp, sizeof(struct disklabel)); 909 return(0); 910 } 911 912 /* 913 * write out the incore copy of this units disklabel 914 */ 915 int 916 fdputdisklabel(sc, dev) 917 struct fd_softc *sc; 918 dev_t dev; 919 { 920 struct disklabel *lp, *dlp; 921 struct buf *bp; 922 int error; 923 924 if ((sc->flags & FDF_HAVELABEL) == 0) 925 return(EBADF); 926 #ifdef FDDEBUG 927 printf("fdputdisklabel\n"); 928 #endif 929 /* 930 * get buf and read in sector 0 931 */ 932 lp = sc->dkdev.dk_label; 933 bp = geteblk((int)lp->d_secsize); 934 bp->b_dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 935 bp->b_blkno = 0; 936 bp->b_cylinder = 0; 937 bp->b_bcount = FDSECSIZE; 938 bp->b_flags |= B_READ; 939 fdstrategy(bp); 940 if ((error = biowait(bp)) != 0) 941 goto done; 942 /* 943 * copy disklabel to buf and write it out syncronous 944 */ 945 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 946 bcopy(lp, dlp, sizeof(struct disklabel)); 947 bp->b_blkno = 0; 948 bp->b_cylinder = 0; 949 bp->b_flags &= ~(B_READ|B_DONE) 950 bp->b_flags |= B_WRITE; 951 fdstrategy(bp); 952 error = biowait(bp); 953 done: 954 brelse(bp); 955 return(error); 956 } 957 958 /* 959 * figure out drive type or NULL if none. 960 */ 961 struct fdtype * 962 fdcgetfdtype(unit) 963 int unit; 964 { 965 struct fdtype *ftp; 966 u_long id, idb; 967 int cnt, umask; 968 969 id = 0; 970 umask = 1 << (3 + unit); 971 972 FDDESELECT(FDCUNITMASK); 973 974 FDSETMOTOR(1); 975 delay(1); 976 FDSELECT(umask); 977 delay(1); 978 FDDESELECT(umask); 979 980 FDSETMOTOR(0); 981 delay(1); 982 FDSELECT(umask); 983 delay(1); 984 FDDESELECT(umask); 985 986 for (idb = 0x80000000; idb; idb >>= 1) { 987 FDSELECT(umask); 988 delay(1); 989 if (FDTESTC(FDB_READY) == 0) 990 id |= idb; 991 FDDESELECT(umask); 992 delay(1); 993 } 994 #ifdef FDDEBUG 995 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 996 #endif 997 998 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 999 if (ftp->driveid == id) 1000 return(ftp); 1001 /* 1002 * 3.5dd's at unit 0 do not always return id. 1003 */ 1004 if (unit == 0) 1005 return(fdtype); 1006 return(NULL); 1007 } 1008 1009 /* 1010 * turn motor off if possible otherwise mark as needed and will be done 1011 * later. 1012 */ 1013 void 1014 fdmotoroff(arg) 1015 void *arg; 1016 { 1017 struct fd_softc *sc; 1018 int s; 1019 1020 sc = arg; 1021 s = splbio(); 1022 1023 #ifdef FDDEBUG 1024 printf("fdmotoroff: unit %d\n", sc->hwunit); 1025 #endif 1026 if ((sc->flags & FDF_MOTORON) == 0) 1027 goto done; 1028 /* 1029 * if we have a timeout on a dma operation let fddmadone() 1030 * deal with it. 1031 */ 1032 if (fdc_indma == sc) { 1033 fddmadone(sc, 1); 1034 goto done; 1035 } 1036 #ifdef FDDEBUG 1037 printf(" motor was on, turning off\n"); 1038 #endif 1039 1040 /* 1041 * flush cache if needed 1042 */ 1043 if (sc->flags & FDF_DIRTY) { 1044 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1045 #ifdef FDDEBUG 1046 printf(" flushing dirty buffer first\n"); 1047 #endif 1048 /* 1049 * if dma'ing done for now, fddone() will call us again 1050 */ 1051 if (fdc_indma) 1052 goto done; 1053 fddmastart(sc, sc->cachetrk); 1054 goto done; 1055 } 1056 1057 /* 1058 * if controller is busy just schedule us to be called back 1059 */ 1060 if (fdc_indma) { 1061 /* 1062 * someone else has the controller now 1063 * just set flag and let fddone() call us again. 1064 */ 1065 sc->flags |= FDF_MOTOROFF; 1066 goto done; 1067 } 1068 1069 #ifdef FDDEBUG 1070 printf(" hw turning unit off\n"); 1071 #endif 1072 1073 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1074 FDDESELECT(FDCUNITMASK); 1075 FDSETMOTOR(0); 1076 delay(1); 1077 FDSELECT(sc->unitmask); 1078 delay(4); 1079 FDDESELECT(sc->unitmask); 1080 delay(1); 1081 if (sc->flags & FDF_WMOTOROFF) 1082 wakeup(fdmotoroff); 1083 done: 1084 splx(s); 1085 } 1086 1087 /* 1088 * select drive seek to track exit with motor on. 1089 * fdsetpos(x, 0, 0) does calibrates the drive. 1090 */ 1091 void 1092 fdsetpos(sc, trk, towrite) 1093 struct fd_softc *sc; 1094 int trk, towrite; 1095 { 1096 int nstep, sdir, ondly, ncyl, nside; 1097 1098 FDDESELECT(FDCUNITMASK); 1099 FDSETMOTOR(1); 1100 delay(1); 1101 FDSELECT(sc->unitmask); 1102 delay(1); 1103 if ((sc->flags & FDF_MOTORON) == 0) { 1104 ondly = 0; 1105 while (FDTESTC(FDB_READY) == 0) { 1106 delay(1000); 1107 if (++ondly >= 1000) 1108 break; 1109 } 1110 } 1111 sc->flags |= FDF_MOTORON; 1112 1113 ncyl = trk / FDNHEADS; 1114 nside = trk % FDNHEADS; 1115 1116 if (sc->curcyl == ncyl && fdc_side == nside) 1117 return; 1118 1119 if (towrite) 1120 sc->flags |= FDF_WRITEWAIT; 1121 1122 #ifdef FDDEBUG 1123 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1124 trk % FDNHEADS, towrite); 1125 #endif 1126 nstep = ncyl - sc->curcyl; 1127 if (nstep) { 1128 /* 1129 * figure direction 1130 */ 1131 if (nstep > 0 && ncyl != 0) { 1132 sdir = FDSTEPIN; 1133 FDSETDIR(1); 1134 } else { 1135 nstep = -nstep; 1136 sdir = FDSTEPOUT; 1137 FDSETDIR(0); 1138 } 1139 if (ncyl == 0) { 1140 /* 1141 * either just want cylinder 0 or doing 1142 * a calibrate. 1143 */ 1144 nstep = 256; 1145 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1146 FDSTEP; 1147 delay(sc->stepdelay); 1148 } 1149 if (nstep < 0) 1150 sc->flags |= FDF_NOTRACK0; 1151 } else { 1152 /* 1153 * step the needed amount amount. 1154 */ 1155 while (nstep--) { 1156 FDSTEP; 1157 delay(sc->stepdelay); 1158 } 1159 } 1160 /* 1161 * if switched directions 1162 * allow drive to settle. 1163 */ 1164 if (sc->pstepdir != sdir) 1165 delay(FDSETTLEDELAY); 1166 sc->pstepdir = sdir; 1167 sc->curcyl = ncyl; 1168 } 1169 if (nside == fdc_side) 1170 return; 1171 /* 1172 * select side 1173 */ 1174 fdc_side = nside; 1175 FDSETHEAD(nside); 1176 delay(FDPRESIDEDELAY); 1177 } 1178 1179 void 1180 fdselunit(sc) 1181 struct fd_softc *sc; 1182 { 1183 FDDESELECT(FDCUNITMASK); /* deselect all */ 1184 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1185 delay(1); 1186 FDSELECT(sc->unitmask); /* select unit */ 1187 delay(1); 1188 } 1189 1190 /* 1191 * process next buf on device queue. 1192 * normall sequence of events: 1193 * fdstart() -> fddmastart(); 1194 * fdidxintr(); 1195 * fdintr() -> fddmadone() -> fddone(); 1196 * if the track is in the cache then fdstart() will short-circuit 1197 * to fddone() else if the track cache is dirty it will flush. If 1198 * the buf is not an entire track it will cache the requested track. 1199 */ 1200 void 1201 fdstart(sc) 1202 struct fd_softc *sc; 1203 { 1204 int trk, error, write; 1205 struct buf *bp, *dp; 1206 int changed; 1207 1208 #ifdef FDDEBUG 1209 printf("fdstart: unit %d\n", sc->hwunit); 1210 #endif 1211 1212 /* 1213 * if dma'ing just return. we must have been called from fdstartegy. 1214 */ 1215 if (fdc_indma) 1216 return; 1217 1218 /* 1219 * get next buf if there. 1220 */ 1221 dp = &sc->curbuf; 1222 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) { 1223 #ifdef FDDEBUG 1224 printf(" nothing to do\n"); 1225 #endif 1226 return; 1227 } 1228 1229 /* 1230 * Mark us as busy now, in case fddone() gets called in one 1231 * of the cases below. 1232 */ 1233 disk_busy(&sc->dkdev); 1234 1235 /* 1236 * make sure same disk is loaded 1237 */ 1238 fdselunit(sc); 1239 changed = FDTESTC(FDB_CHANGED); 1240 FDDESELECT(sc->unitmask); 1241 if (changed) { 1242 /* 1243 * disk missing, invalidate all future io on 1244 * this unit until re-open()'ed also invalidate 1245 * all current io 1246 */ 1247 printf("fdstart: disk changed\n"); 1248 #ifdef FDDEBUG 1249 printf(" disk was removed invalidating all io\n"); 1250 #endif 1251 sc->flags &= ~FDF_HAVELABEL; 1252 for (;;) { 1253 bp->b_flags |= B_ERROR; 1254 bp->b_error = EIO; 1255 if (BUFQ_NEXT(bp) == NULL) 1256 break; 1257 biodone(bp); 1258 bp = BUFQ_NEXT(bp); 1259 } 1260 /* 1261 * do fddone() on last buf to allow other units to start. 1262 */ 1263 BUFQ_INSERT_HEAD(&sc->bufq, bp); 1264 fddone(sc); 1265 return; 1266 } 1267 1268 /* 1269 * we have a valid buf, setup our local version 1270 * we use this count to allow reading over multiple tracks. 1271 * into a single buffer 1272 */ 1273 dp->b_bcount = bp->b_bcount; 1274 dp->b_blkno = bp->b_blkno; 1275 dp->b_data = bp->b_data; 1276 dp->b_flags = bp->b_flags; 1277 dp->b_resid = 0; 1278 1279 if (bp->b_flags & B_READ) 1280 write = 0; 1281 else if (FDTESTC(FDB_PROTECT) == 0) 1282 write = 1; 1283 else { 1284 error = EPERM; 1285 goto bad; 1286 } 1287 1288 /* 1289 * figure trk given blkno 1290 */ 1291 trk = bp->b_blkno / sc->nsectors; 1292 1293 /* 1294 * check to see if same as currently cached track 1295 * if so we need to do no dma read. 1296 */ 1297 if (trk == sc->cachetrk) { 1298 fddone(sc); 1299 return; 1300 } 1301 1302 /* 1303 * if we will be overwriting the entire cache, don't bother to 1304 * fetch it. 1305 */ 1306 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1307 bp->b_blkno % sc->nsectors == 0) { 1308 if (sc->flags & FDF_DIRTY) 1309 sc->flags |= FDF_JUSTFLUSH; 1310 else { 1311 sc->cachetrk = trk; 1312 fddone(sc); 1313 return; 1314 } 1315 } 1316 1317 /* 1318 * start dma read of `trk' 1319 */ 1320 fddmastart(sc, trk); 1321 return; 1322 bad: 1323 bp->b_flags |= B_ERROR; 1324 bp->b_error = error; 1325 fddone(sc); 1326 } 1327 1328 /* 1329 * continue a started operation on next track. always begin at 1330 * sector 0 on the next track. 1331 */ 1332 void 1333 fdcont(sc) 1334 struct fd_softc *sc; 1335 { 1336 struct buf *dp, *bp; 1337 int trk, write; 1338 1339 dp = &sc->curbuf; 1340 bp = BUFQ_FIRST(&sc->bufq); 1341 dp->b_data += (dp->b_bcount - bp->b_resid); 1342 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1343 dp->b_bcount = bp->b_resid; 1344 1345 /* 1346 * figure trk given blkno 1347 */ 1348 trk = dp->b_blkno / sc->nsectors; 1349 #ifdef DEBUG 1350 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1351 panic("fdcont: confused"); 1352 #endif 1353 if (dp->b_flags & B_READ) 1354 write = 0; 1355 else 1356 write = 1; 1357 /* 1358 * if we will be overwriting the entire cache, don't bother to 1359 * fetch it. 1360 */ 1361 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1362 if (sc->flags & FDF_DIRTY) 1363 sc->flags |= FDF_JUSTFLUSH; 1364 else { 1365 sc->cachetrk = trk; 1366 fddone(sc); 1367 return; 1368 } 1369 } 1370 /* 1371 * start dma read of `trk' 1372 */ 1373 fddmastart(sc, trk); 1374 return; 1375 } 1376 1377 void 1378 fddmastart(sc, trk) 1379 struct fd_softc *sc; 1380 int trk; 1381 { 1382 int adkmask, ndmaw, write, dmatrk; 1383 1384 #ifdef FDDEBUG 1385 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1386 trk / FDNHEADS, trk % FDNHEADS); 1387 #endif 1388 /* 1389 * flush the cached track if dirty else read requested track. 1390 */ 1391 if (sc->flags & FDF_DIRTY) { 1392 fdcachetoraw(sc); 1393 ndmaw = sc->type->nwritew; 1394 dmatrk = sc->cachetrk; 1395 write = 1; 1396 } else { 1397 ndmaw = sc->type->nreadw; 1398 dmatrk = trk; 1399 write = 0; 1400 } 1401 1402 #ifdef FDDEBUG 1403 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1404 #endif 1405 sc->cachetrk = trk; 1406 fdc_indma = sc; 1407 fdsetpos(sc, dmatrk, write); 1408 1409 /* 1410 * setup dma stuff 1411 */ 1412 if (write == 0) { 1413 custom.adkcon = ADKF_MSBSYNC; 1414 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1415 custom.dsksync = FDMFMSYNC; 1416 } else { 1417 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1418 ADKF_MSBSYNC; 1419 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1420 if (dmatrk >= sc->type->precomp[0]) 1421 adkmask |= ADKF_PRECOMP0; 1422 if (dmatrk >= sc->type->precomp[1]) 1423 adkmask |= ADKF_PRECOMP1; 1424 custom.adkcon = adkmask; 1425 } 1426 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1427 1428 /* 1429 * If writing an MSDOS track, activate disk index pulse 1430 * interrupt, dma will be started in the intr routine fdidxintr() 1431 * Otherwise, start the DMA here. 1432 */ 1433 if (write && sc->openpart == FDMSDOSPART) { 1434 fdc_dmalen = ndmaw; 1435 fdc_dmawrite = write; 1436 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1437 } else { 1438 FDDMASTART(ndmaw, write); 1439 fdc_dmalen = 0; 1440 } 1441 1442 #ifdef FDDEBUG 1443 printf(" dma started\n"); 1444 #endif 1445 } 1446 1447 /* 1448 * recalibrate the drive 1449 */ 1450 void 1451 fdcalibrate(arg) 1452 void *arg; 1453 { 1454 struct fd_softc *sc; 1455 static int loopcnt; 1456 1457 sc = arg; 1458 1459 if (loopcnt == 0) { 1460 /* 1461 * seek cyl 0 1462 */ 1463 fdc_indma = sc; 1464 sc->stepdelay += 900; 1465 if (sc->cachetrk > 1) 1466 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1467 sc->stepdelay -= 900; 1468 } 1469 if (loopcnt++ & 1) 1470 fdsetpos(sc, sc->cachetrk, 0); 1471 else 1472 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1473 /* 1474 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1475 */ 1476 if (loopcnt < 8) 1477 callout_reset(&sc->calibrate_ch, hz / 8, fdcalibrate, sc); 1478 else { 1479 loopcnt = 0; 1480 fdc_indma = NULL; 1481 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1482 fddmastart(sc, sc->cachetrk); 1483 } 1484 } 1485 1486 void 1487 fddmadone(sc, timeo) 1488 struct fd_softc *sc; 1489 int timeo; 1490 { 1491 #ifdef FDDEBUG 1492 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1493 #endif 1494 fdc_indma = NULL; 1495 callout_stop(&sc->motor_ch); 1496 FDDMASTOP; 1497 1498 /* 1499 * guarantee the drive has been at current head and cyl 1500 * for at least FDWRITEDELAY after a write. 1501 */ 1502 if (sc->flags & FDF_WRITEWAIT) { 1503 delay(FDWRITEDELAY); 1504 sc->flags &= ~FDF_WRITEWAIT; 1505 } 1506 1507 if ((sc->flags & FDF_MOTOROFF) == 0) { 1508 /* 1509 * motor runs for 1.5 seconds after last dma 1510 */ 1511 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1512 } 1513 if (sc->flags & FDF_DIRTY) { 1514 /* 1515 * if buffer dirty, the last dma cleaned it 1516 */ 1517 sc->flags &= ~FDF_DIRTY; 1518 if (timeo) 1519 printf("%s: write of track cache timed out.\n", 1520 sc->sc_dv.dv_xname); 1521 if (sc->flags & FDF_JUSTFLUSH) { 1522 sc->flags &= ~FDF_JUSTFLUSH; 1523 /* 1524 * we are done dma'ing 1525 */ 1526 fddone(sc); 1527 return; 1528 } 1529 /* 1530 * load the cache 1531 */ 1532 fddmastart(sc, sc->cachetrk); 1533 return; 1534 } 1535 #ifdef FDDEBUG 1536 else if (sc->flags & FDF_MOTOROFF) 1537 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1538 #endif 1539 1540 /* 1541 * cache loaded decode it into cache buffer 1542 */ 1543 if (timeo == 0 && fdrawtocache(sc) == 0) 1544 sc->retried = 0; 1545 else { 1546 #ifdef FDDEBUG 1547 if (timeo) 1548 printf("%s: fddmadone: cache load timed out.\n", 1549 sc->sc_dv.dv_xname); 1550 #endif 1551 if (sc->retried >= sc->retries) { 1552 sc->retried = 0; 1553 sc->cachetrk = -1; 1554 } else { 1555 sc->retried++; 1556 /* 1557 * this will be restarted at end of calibrate loop. 1558 */ 1559 callout_stop(&sc->motor_ch); 1560 fdcalibrate(sc); 1561 return; 1562 } 1563 } 1564 fddone(sc); 1565 } 1566 1567 void 1568 fddone(sc) 1569 struct fd_softc *sc; 1570 { 1571 struct buf *dp, *bp; 1572 char *data; 1573 int sz; 1574 1575 #ifdef FDDEBUG 1576 printf("fddone: unit %d\n", sc->hwunit); 1577 #endif 1578 /* 1579 * check to see if unit is just flushing the cache, 1580 * that is we have no io queued. 1581 */ 1582 if (sc->flags & FDF_MOTOROFF) 1583 goto nobuf; 1584 1585 dp = &sc->curbuf; 1586 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) 1587 panic ("fddone"); 1588 /* 1589 * check for an error that may have occured 1590 * while getting the track. 1591 */ 1592 if (sc->cachetrk == -1) { 1593 sc->retried = 0; 1594 bp->b_flags |= B_ERROR; 1595 bp->b_error = EIO; 1596 } else if ((bp->b_flags & B_ERROR) == 0) { 1597 data = sc->cachep; 1598 /* 1599 * get offset of data in track cache and limit 1600 * the copy size to not exceed the cache's end. 1601 */ 1602 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1603 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1604 sz *= FDSECSIZE; 1605 sz = min(dp->b_bcount, sz); 1606 if (bp->b_flags & B_READ) 1607 bcopy(data, dp->b_data, sz); 1608 else { 1609 bcopy(dp->b_data, data, sz); 1610 sc->flags |= FDF_DIRTY; 1611 } 1612 bp->b_resid = dp->b_bcount - sz; 1613 if (bp->b_resid == 0) { 1614 bp->b_error = 0; 1615 } else { 1616 /* 1617 * not done yet need to read next track 1618 */ 1619 fdcont(sc); 1620 return; 1621 } 1622 } 1623 /* 1624 * remove from queue. 1625 */ 1626 BUFQ_REMOVE(&sc->bufq, bp); 1627 1628 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1629 1630 biodone(bp); 1631 nobuf: 1632 fdfindwork(sc->sc_dv.dv_unit); 1633 } 1634 1635 void 1636 fdfindwork(unit) 1637 int unit; 1638 { 1639 struct fd_softc *ssc, *sc; 1640 int i, last; 1641 1642 /* 1643 * first see if we have any fdopen()'s waiting 1644 */ 1645 if (fdc_wantwakeup) { 1646 wakeup(fdopen); 1647 fdc_wantwakeup--; 1648 return; 1649 } 1650 1651 /* 1652 * start next available unit, linear search from the next unit 1653 * wrapping and finally this unit. 1654 */ 1655 last = 0; 1656 ssc = NULL; 1657 for (i = unit + 1; last == 0; i++) { 1658 if (i == unit) 1659 last = 1; 1660 if (i >= fd_cd.cd_ndevs) { 1661 i = -1; 1662 continue; 1663 } 1664 if ((sc = fd_cd.cd_devs[i]) == NULL) 1665 continue; 1666 1667 /* 1668 * if unit has requested to be turned off 1669 * and it has no buf's queued do it now 1670 */ 1671 if (sc->flags & FDF_MOTOROFF) { 1672 if (BUFQ_FIRST(&sc->bufq) == NULL) 1673 fdmotoroff(sc); 1674 else { 1675 /* 1676 * we gained a buf request while 1677 * we waited, forget the motoroff 1678 */ 1679 sc->flags &= ~FDF_MOTOROFF; 1680 } 1681 /* 1682 * if we now have dma unit must have needed 1683 * flushing, quit 1684 */ 1685 if (fdc_indma) 1686 return; 1687 } 1688 /* 1689 * if we have no start unit and the current unit has 1690 * io waiting choose this unit to start. 1691 */ 1692 if (ssc == NULL && BUFQ_FIRST(&sc->bufq) != NULL) 1693 ssc = sc; 1694 } 1695 if (ssc) 1696 fdstart(ssc); 1697 } 1698 1699 /* 1700 * min byte count to whats left of the track in question 1701 */ 1702 void 1703 fdminphys(bp) 1704 struct buf *bp; 1705 { 1706 struct fd_softc *sc; 1707 int trk, sec, toff, tsz; 1708 1709 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1710 panic("fdminphys: couldn't get softc"); 1711 1712 trk = bp->b_blkno / sc->nsectors; 1713 sec = bp->b_blkno % sc->nsectors; 1714 1715 toff = sec * FDSECSIZE; 1716 tsz = sc->nsectors * FDSECSIZE; 1717 #ifdef FDDEBUG 1718 printf("fdminphys: before %d", bp->b_bcount); 1719 #endif 1720 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1721 #ifdef FDDEBUG 1722 printf(" after %d\n", bp->b_bcount); 1723 #endif 1724 minphys(bp); 1725 } 1726 1727 /* 1728 * encode the track cache into raw MFM ready for dma 1729 * when we go to multiple disk formats, this will call type dependent 1730 * functions 1731 */ 1732 void fdcachetoraw(sc) 1733 struct fd_softc *sc; 1734 { 1735 if (sc->openpart == FDMSDOSPART) 1736 mscachetoraw(sc); 1737 else 1738 amcachetoraw(sc); 1739 } 1740 1741 /* 1742 * decode raw MFM from dma into units track cache. 1743 * when we go to multiple disk formats, this will call type dependent 1744 * functions 1745 */ 1746 int 1747 fdrawtocache(sc) 1748 struct fd_softc *sc; 1749 { 1750 1751 if (sc->openpart == FDMSDOSPART) 1752 return(msrawtocache(sc)); 1753 else 1754 return(amrawtocache(sc)); 1755 } 1756 1757 void 1758 amcachetoraw(sc) 1759 struct fd_softc *sc; 1760 { 1761 static u_long mfmnull[4]; 1762 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1763 int sec, i; 1764 1765 rp = fdc_dmap; 1766 1767 /* 1768 * not yet one sector (- 1 long) gap. 1769 * for now use previous drivers values 1770 */ 1771 for (i = 0; i < sc->type->gap; i++) 1772 *rp++ = 0xaaaaaaaa; 1773 /* 1774 * process sectors 1775 */ 1776 dp = sc->cachep; 1777 zero = 0; 1778 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1779 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1780 hcksum = dcksum = 0; 1781 /* 1782 * sector format 1783 * offset description 1784 *----------------------------------- 1785 * 0 null 1786 * 1 sync 1787 * oddbits evenbits 1788 *---------------------- 1789 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1790 * 4-7 8-11 null 1791 * 12 13 header cksum [2-11] 1792 * 14 15 data cksum [16-271] 1793 * 16-143 144-271 data 1794 */ 1795 *rp = 0xaaaaaaaa; 1796 if (*(rp - 1) & 0x1) 1797 *rp &= 0x7fffffff; /* clock bit correction */ 1798 rp++; 1799 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1800 rp = mfmblkencode(&info, rp, &hcksum, 1); 1801 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1802 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1803 1804 crp = rp; 1805 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1806 dp += FDSECLWORDS; 1807 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1808 if (*(crp - 1) & 0x1) 1809 *crp &= 0x7fffffff; /* clock bit correction */ 1810 else if ((*crp & 0x40000000) == 0) 1811 *crp |= 0x80000000; 1812 } 1813 *rp = 0xaaa80000; 1814 if (*(rp - 1) & 0x1) 1815 *rp &= 0x7fffffff; 1816 } 1817 1818 u_long * 1819 fdfindsync(rp, ep) 1820 u_long *rp, *ep; 1821 { 1822 u_short *sp; 1823 1824 sp = (u_short *)rp; 1825 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1826 sp++; 1827 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1828 sp++; 1829 if ((u_long *)sp < ep) 1830 return((u_long *)sp); 1831 return(NULL); 1832 } 1833 1834 int 1835 amrawtocache(sc) 1836 struct fd_softc *sc; 1837 { 1838 u_long mfmnull[4]; 1839 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1840 int cnt, doagain; 1841 1842 doagain = 1; 1843 srp = rp = fdc_dmap; 1844 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1845 cnt = 0; 1846 again: 1847 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1848 #ifdef DIAGNOSTIC 1849 printf("%s: corrupted track (%d) data.\n", 1850 sc->sc_dv.dv_xname, sc->cachetrk); 1851 #endif 1852 return(-1); 1853 } 1854 1855 /* 1856 * process sectors 1857 */ 1858 for (; cnt < sc->nsectors; cnt++) { 1859 hcksum = dcksum = 0; 1860 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1861 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1862 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1863 if (cktmp != hcksum) { 1864 #ifdef FDDEBUG 1865 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1866 info, hcksum, cktmp); 1867 #endif 1868 goto again; 1869 } 1870 if (((info >> 16) & 0xff) != sc->cachetrk) { 1871 #ifdef DEBUG 1872 printf("%s: incorrect track found: 0x%lx %d\n", 1873 sc->sc_dv.dv_xname, info, sc->cachetrk); 1874 #endif 1875 goto again; 1876 } 1877 #ifdef FDDEBUG 1878 printf(" info 0x%x\n", info); 1879 #endif 1880 1881 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1882 dp = sc->cachep; 1883 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1884 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1885 if (cktmp != dcksum) { 1886 #ifdef FDDEBUG 1887 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1888 info, dcksum, cktmp); 1889 #endif 1890 goto again; 1891 } 1892 1893 /* 1894 * if we are at gap then we can no longer be sure 1895 * of correct sync marks 1896 */ 1897 if ((info && 0xff) == 1) 1898 doagain = 1; 1899 else 1900 doagain = 0; 1901 srp = rp = fdfindsync(crp, erp); 1902 } 1903 return(0); 1904 } 1905 1906 void 1907 mscachetoraw(sc) 1908 struct fd_softc *sc; 1909 { 1910 u_short *rp, *erp, crc; 1911 u_char *cp, tb[5]; 1912 int sec, i; 1913 1914 rp = (u_short *)fdc_dmap; 1915 erp = rp + sc->type->nwritew; 1916 cp = sc->cachep; 1917 1918 /* 1919 * initial track filler (828 * GAP1) 1920 */ 1921 for (i = 0; i < sc->type->gap; i++) { 1922 *rp++ = FDMFMGAP1; 1923 *rp++ = FDMFMGAP1; 1924 } 1925 1926 for (sec = 0; sec < sc->nsectors; sec++) { 1927 1928 /* 1929 * leading sector gap 1930 * (12 * GAP2) + (3 * SYNC) 1931 */ 1932 for (i = 0; i < 12; i++) 1933 *rp++ = FDMFMGAP2; 1934 *rp++ = FDMFMSYNC; 1935 *rp++ = FDMFMSYNC; 1936 *rp++ = FDMFMSYNC; 1937 1938 /* 1939 * sector information 1940 * (ID) + track + side + sector + sector size + CRC16 1941 */ 1942 *rp++ = FDMFMID; 1943 tb[0] = sc->cachetrk / FDNHEADS; 1944 tb[1] = sc->cachetrk % FDNHEADS; 1945 tb[2] = sec + 1; 1946 i = sc->bytespersec; 1947 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1948 rp = msblkencode(rp, tb, 4, &crc); 1949 tb[0] = crc >> 8; 1950 tb[1] = crc & 0xff; 1951 tb[2] = 0x4e; /* GAP1 decoded */ 1952 rp = msblkencode(rp, tb, 3, 0); 1953 1954 /* 1955 * sector info/data gap 1956 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1957 */ 1958 for (i = 0; i < 21; i++) 1959 *rp++ = FDMFMGAP1; 1960 for (i = 0; i < 12; i++) 1961 *rp++ = FDMFMGAP2; 1962 *rp++ = FDMFMSYNC; 1963 *rp++ = FDMFMSYNC; 1964 *rp++ = FDMFMSYNC; 1965 1966 /* 1967 * sector data 1968 * (DATA) + ...data... + CRC16 1969 */ 1970 *rp++ = FDMFMDATA; 1971 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1972 cp += sc->bytespersec; 1973 tb[0] = crc >> 8; 1974 tb[1] = crc & 0xff; 1975 tb[2] = 0x4e; /* GAP3 decoded */ 1976 rp = msblkencode(rp, tb, 3, 0); 1977 1978 /* 1979 * trailing sector gap 1980 * (80 * GAP3) 1981 */ 1982 for (i = 0; i < 79; i++) 1983 *rp++ = FDMFMGAP3; 1984 } 1985 1986 /* 1987 * fill rest of track with GAP3 1988 */ 1989 while (rp != erp) 1990 *rp++ = FDMFMGAP3; 1991 1992 } 1993 1994 int 1995 msrawtocache(sc) 1996 struct fd_softc *sc; 1997 { 1998 u_short *rp, *srp, *erp; 1999 u_char tb[5], *cp; 2000 int ct, sec, retry; 2001 2002 srp = rp = (u_short *)fdc_dmap; 2003 erp = rp + sc->type->nreadw; 2004 cp = sc->cachep; 2005 2006 for (ct = 0; ct < sc->nsectors; ct++) { 2007 retry = 1; 2008 do { 2009 /* 2010 * skip leading gap to sync 2011 */ 2012 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 2013 #ifdef DIAGNOSTIC 2014 printf("%s: corrupted track (%d) data.\n", 2015 sc->sc_dv.dv_xname, sc->cachetrk); 2016 #endif 2017 return(-1); 2018 } 2019 2020 /* 2021 * Grab sector info 2022 */ 2023 if (*rp++ != FDMFMID) 2024 continue; 2025 rp = msblkdecode(rp, tb, 4); 2026 #ifdef FDDEBUG 2027 printf("sector id: sector %d, track %d, side %d," 2028 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 2029 #endif 2030 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 2031 tb[2] > sc->nsectors) 2032 continue; 2033 2034 sec = tb[2]; 2035 sc->bytespersec = 128 << tb[3]; 2036 rp += 2; /* skip CRC-16 */ 2037 2038 /* 2039 * skip gap and read in data 2040 */ 2041 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 2042 return(-1); 2043 if (*rp++ != FDMFMDATA) 2044 continue; 2045 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 2046 sc->bytespersec); 2047 rp += 2; /* skip CRC-16 */ 2048 2049 retry = 0; 2050 } while (retry); 2051 } 2052 return(0); 2053 } 2054 2055 /* 2056 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2057 * this format specified that the odd bits are at current pos and even 2058 * bits at len + current pos 2059 */ 2060 u_long * 2061 mfmblkencode(dp, rp, cp, len) 2062 u_long *dp, *rp, *cp; 2063 int len; 2064 { 2065 u_long *sdp, *edp, d, dtmp, correct; 2066 2067 sdp = dp; 2068 edp = dp + len; 2069 2070 if (*(rp - 1) & 0x1) 2071 correct = 1; 2072 else 2073 correct = 0; 2074 /* 2075 * do odd bits 2076 */ 2077 while (dp < edp) { 2078 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2079 dtmp = d ^ 0x55555555; 2080 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2081 /* 2082 * correct upper clock bit if needed 2083 */ 2084 if (correct) 2085 d &= 0x7fffffff; 2086 if (d & 0x1) 2087 correct = 1; 2088 else 2089 correct = 0; 2090 /* 2091 * do checksums and store in raw buffer 2092 */ 2093 if (cp) 2094 *cp ^= d; 2095 *rp++ = d; 2096 dp++; 2097 } 2098 /* 2099 * do even bits 2100 */ 2101 dp = sdp; 2102 while (dp < edp) { 2103 d = *dp & 0x55555555; /* remove clock bits */ 2104 dtmp = d ^ 0x55555555; 2105 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2106 /* 2107 * correct upper clock bit if needed 2108 */ 2109 if (correct) 2110 d &= 0x7fffffff; 2111 if (d & 0x1) 2112 correct = 1; 2113 else 2114 correct = 0; 2115 /* 2116 * do checksums and store in raw buffer 2117 */ 2118 if (cp) 2119 *cp ^= d; 2120 *rp++ = d; 2121 dp++; 2122 } 2123 if (cp) 2124 *cp &= 0x55555555; 2125 return(rp); 2126 } 2127 2128 /* 2129 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2130 * this format specified that the odd bits are at current pos and even 2131 * bits at len + current pos 2132 */ 2133 u_long * 2134 mfmblkdecode(rp, dp, cp, len) 2135 u_long *rp, *dp, *cp; 2136 int len; 2137 { 2138 u_long o, e; 2139 int cnt; 2140 2141 cnt = len; 2142 while (cnt--) { 2143 o = *rp; 2144 e = *(rp + len); 2145 if (cp) { 2146 *cp ^= o; 2147 *cp ^= e; 2148 } 2149 o &= 0x55555555; 2150 e &= 0x55555555; 2151 *dp++ = (o << 1) | e; 2152 rp++; 2153 } 2154 if (cp) 2155 *cp &= 0x55555555; 2156 return(rp + len); 2157 } 2158 2159 /* 2160 * decode len words in standard MFM format to len bytes 2161 * of data. 2162 */ 2163 u_short * 2164 msblkdecode(rp, cp, len) 2165 u_short *rp; 2166 u_char *cp; 2167 int len; 2168 { 2169 while (len--) { 2170 *cp++ = msdecode[*rp & 0x7f] | 2171 (msdecode[(*rp >> 8) & 0x7f] << 4); 2172 rp++; 2173 } 2174 2175 return(rp); 2176 } 2177 2178 /* 2179 * encode len bytes of data into len words in standard MFM format. 2180 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2181 * as well. 2182 */ 2183 u_short * 2184 msblkencode(rp, cp, len, crc) 2185 u_short *rp; 2186 u_char *cp; 2187 int len; 2188 u_short *crc; 2189 { 2190 u_short td; 2191 u_short mycrc; 2192 2193 /* preload crc for header (4 bytes) 2194 * or data (anything else) 2195 */ 2196 mycrc = (len == 4) ? 0xb230 : 0xe295; 2197 2198 while (len--) { 2199 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2200 2201 /* Check for zeros in top bit of encode and bottom 2202 * bit of previous encode. if so, slap a one in betweem 2203 * them. 2204 */ 2205 if ((td & 0x140) == 0) 2206 td |= 0x80; 2207 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2208 td |= 0x8000; 2209 2210 *rp++ = td; 2211 2212 /* 2213 * calc crc if requested 2214 */ 2215 if (crc) 2216 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2217 2218 cp++; 2219 } 2220 2221 if (crc) 2222 *crc = mycrc; 2223 2224 return(rp); 2225 } 2226 2227 int 2228 fddump(dev, blkno, va, size) 2229 dev_t dev; 2230 daddr_t blkno; 2231 caddr_t va; 2232 size_t size; 2233 { 2234 return (EINVAL); 2235 } 2236
Indexes created Thu Oct 02 14:10:14 GMT 2025