fd.c revision 1.49
1 /* $NetBSD: fd.c,v 1.49 2002/01/26 13:40:53 aymeric 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(struct device *, struct cfdata *, void *); 189 void fdcattach(struct device *, struct device *, void *); 190 int fdcprint(void *, const char *); 191 int fdmatch(struct device *, struct cfdata *, void *); 192 void fdattach(struct device *, struct device *, void *); 193 194 void fdintr(int); 195 void fdidxintr(void); 196 void fdstrategy(struct buf *); 197 int fdloaddisk(struct fd_softc *); 198 void fdgetdefaultlabel(struct fd_softc *, struct disklabel *, int); 199 int fdgetdisklabel(struct fd_softc *, dev_t); 200 int fdsetdisklabel(struct fd_softc *, struct disklabel *); 201 int fdputdisklabel(struct fd_softc *, dev_t); 202 struct fdtype * fdcgetfdtype(int); 203 void fdmotoroff(void *); 204 void fdsetpos(struct fd_softc *, int, int); 205 void fdselunit(struct fd_softc *); 206 void fdstart(struct fd_softc *); 207 void fdcont(struct fd_softc *); 208 void fddmastart(struct fd_softc *, int); 209 void fdcalibrate(void *); 210 void fddmadone(struct fd_softc *, int); 211 void fddone(struct fd_softc *); 212 void fdfindwork(int); 213 void fdminphys(struct buf *); 214 void fdcachetoraw(struct fd_softc *); 215 void amcachetoraw(struct fd_softc *); 216 int amrawtocache(struct fd_softc *); 217 u_long *fdfindsync(u_long *, u_long *); 218 int fdrawtocache(struct fd_softc *); 219 void mscachetoraw(struct fd_softc *); 220 int msrawtocache(struct fd_softc *); 221 u_long *mfmblkencode(u_long *, u_long *, u_long *, int); 222 u_long *mfmblkdecode(u_long *, u_long *, u_long *, int); 223 u_short *msblkdecode(u_short *, u_char *, int); 224 u_short *msblkencode(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(struct device *pdp, struct cfdata *cfp, 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(struct device *pdp, struct device *dp, void *auxp) 329 { 330 struct fdcargs args; 331 332 printf(": dmabuf pa 0x%x", kvtop(fdc_dmap)); 333 printf(": dmabuf ka %p\n", fdc_dmap); 334 args.unit = 0; 335 args.type = fdcgetfdtype(args.unit); 336 337 fdc_side = -1; 338 config_found(dp, &args, fdcprint); 339 for (args.unit++; args.unit < FDMAXUNITS; args.unit++) { 340 if ((args.type = fdcgetfdtype(args.unit)) == NULL) 341 continue; 342 config_found(dp, &args, fdcprint); 343 } 344 } 345 346 int 347 fdcprint(void *auxp, const char *pnp) 348 { 349 struct fdcargs *fcp; 350 351 fcp = auxp; 352 if (pnp) 353 printf("fd%d at %s unit %d:", fcp->unit, pnp, 354 fcp->type->driveid); 355 return(UNCONF); 356 } 357 358 /*ARGSUSED*/ 359 int 360 fdmatch(struct device *pdp, struct cfdata *cfp, void *auxp) 361 { 362 struct fdcargs *fdap; 363 364 fdap = auxp; 365 if (cfp->cf_loc[FDCCF_UNIT] == fdap->unit || 366 cfp->cf_loc[FDCCF_UNIT] == FDCCF_UNIT_DEFAULT) 367 return(1); 368 369 return(0); 370 } 371 372 void 373 fdattach(struct device *pdp, struct device *dp, void *auxp) 374 { 375 struct fdcargs *ap; 376 struct fd_softc *sc; 377 int i; 378 379 ap = auxp; 380 sc = (struct fd_softc *)dp; 381 382 BUFQ_INIT(&sc->bufq); 383 callout_init(&sc->calibrate_ch); 384 callout_init(&sc->motor_ch); 385 386 sc->curcyl = sc->cachetrk = -1; 387 sc->openpart = -1; 388 sc->type = ap->type; 389 sc->hwunit = ap->unit; 390 sc->unitmask = 1 << (3 + ap->unit); 391 sc->retries = FDRETRIES; 392 sc->stepdelay = FDSTEPDELAY; 393 sc->bytespersec = 512; 394 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 395 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 396 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 397 398 /* 399 * Initialize and attach the disk structure. 400 */ 401 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 402 sc->dkdev.dk_driver = &fddkdriver; 403 disk_attach(&sc->dkdev); 404 405 /* 406 * calibrate the drive 407 */ 408 fdsetpos(sc, 0, 0); 409 fdsetpos(sc, sc->type->ncylinders, 0); 410 fdsetpos(sc, 0, 0); 411 fdmotoroff(sc); 412 413 /* 414 * precalc msdos MFM and CRC 415 */ 416 for (i = 0; i < 128; i++) 417 msdecode[i] = 0xff; 418 for (i = 0; i < 16; i++) 419 msdecode[msencode[i]] = i; 420 for (i = 0; i < 256; i++) { 421 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 422 (0x1021 * (i >> 4)); 423 } 424 425 /* 426 * enable disk related interrupts 427 */ 428 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 429 custom.intena = INTF_SETCLR | INTF_DSKBLK; 430 ciab.icr = CIA_ICR_FLG; 431 } 432 433 /*ARGSUSED*/ 434 int 435 fdopen(dev_t dev, int flags, int devtype, struct proc *p) 436 { 437 struct fd_softc *sc; 438 int wasopen, fwork, error, s; 439 440 error = 0; 441 442 if (FDPART(dev) >= FDMAXPARTS) 443 return(ENXIO); 444 445 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 446 return(ENXIO); 447 if (sc->flags & FDF_NOTRACK0) 448 return(ENXIO); 449 if (sc->cachep == NULL) 450 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 451 452 s = splbio(); 453 /* 454 * if we are sleeping in fdclose(); waiting for a chance to 455 * shut the motor off, do a sleep here also. 456 */ 457 while (sc->flags & FDF_WMOTOROFF) 458 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 459 460 fwork = 0; 461 /* 462 * if not open let user open request type, otherwise 463 * ensure they are trying to open same type. 464 */ 465 if (sc->openpart == FDPART(dev)) 466 wasopen = 1; 467 else if (sc->openpart == -1) { 468 sc->openpart = FDPART(dev); 469 wasopen = 0; 470 } else { 471 wasopen = 1; 472 error = EPERM; 473 goto done; 474 } 475 476 /* 477 * wait for current io to complete if any 478 */ 479 if (fdc_indma) { 480 fwork = 1; 481 fdc_wantwakeup++; 482 tsleep(fdopen, PRIBIO, "fdopen", 0); 483 } 484 if ((error = fdloaddisk(sc)) != 0) 485 goto done; 486 if ((error = fdgetdisklabel(sc, dev)) != 0) 487 goto done; 488 #ifdef FDDEBUG 489 printf(" open successful\n"); 490 #endif 491 done: 492 /* 493 * if we requested that fddone()->fdfindwork() wake us, allow it to 494 * complete its job now 495 */ 496 if (fwork) 497 fdfindwork(FDUNIT(dev)); 498 splx(s); 499 500 /* 501 * if we were not open and we marked us so reverse that. 502 */ 503 if (error && wasopen == 0) 504 sc->openpart = -1; 505 return(error); 506 } 507 508 /*ARGSUSED*/ 509 int 510 fdclose(dev_t dev, int flags, int devtype, struct proc *p) 511 { 512 struct fd_softc *sc; 513 int s; 514 515 #ifdef FDDEBUG 516 printf("fdclose()\n"); 517 #endif 518 sc = getsoftc(fd_cd, FDUNIT(dev)); 519 s = splbio(); 520 if (sc->flags & FDF_MOTORON) { 521 sc->flags |= FDF_WMOTOROFF; 522 tsleep(fdmotoroff, PRIBIO, "fdclose", 0); 523 sc->flags &= ~FDF_WMOTOROFF; 524 wakeup(fdmotoroff); 525 } 526 sc->openpart = -1; 527 splx(s); 528 return(0); 529 } 530 531 int 532 fdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 533 { 534 struct fd_softc *sc; 535 int error, wlab; 536 537 sc = getsoftc(fd_cd, FDUNIT(dev)); 538 539 if ((sc->flags & FDF_HAVELABEL) == 0) 540 return(EBADF); 541 542 switch (cmd) { 543 case DIOCSBAD: 544 return(EINVAL); 545 case DIOCSRETRIES: 546 if (*(int *)addr < 0) 547 return(EINVAL); 548 sc->retries = *(int *)addr; 549 return(0); 550 case DIOCSSTEP: 551 if (*(int *)addr < FDSTEPDELAY) 552 return(EINVAL); 553 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 554 return(0); 555 case DIOCGDINFO: 556 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 557 return(0); 558 case DIOCGPART: 559 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 560 ((struct partinfo *)addr)->part = 561 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 562 return(0); 563 case DIOCSDINFO: 564 if ((flag & FWRITE) == 0) 565 return(EBADF); 566 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 567 case DIOCWDINFO: 568 if ((flag & FWRITE) == 0) 569 return(EBADF); 570 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 571 return(error); 572 wlab = sc->wlabel; 573 sc->wlabel = 1; 574 error = fdputdisklabel(sc, dev); 575 sc->wlabel = wlab; 576 return(error); 577 case DIOCWLABEL: 578 if ((flag & FWRITE) == 0) 579 return(EBADF); 580 sc->wlabel = *(int *)addr; 581 return(0); 582 case DIOCGDEFLABEL: 583 fdgetdefaultlabel(sc, (struct disklabel *)addr, FDPART(dev)); 584 return(0); 585 default: 586 return(ENOTTY); 587 } 588 } 589 590 /* 591 * no dumps to floppy disks thank you. 592 */ 593 int 594 fdsize(dev_t dev) 595 { 596 return(-1); 597 } 598 599 int 600 fdread(dev_t dev, struct uio *uio, int flags) 601 { 602 return (physio(fdstrategy, NULL, dev, B_READ, fdminphys, uio)); 603 } 604 605 int 606 fdwrite(dev_t dev, struct uio *uio, int flags) 607 { 608 return (physio(fdstrategy, NULL, dev, B_WRITE, fdminphys, uio)); 609 } 610 611 612 void 613 fdintr(int flag) 614 { 615 int s; 616 617 s = splbio(); 618 if (fdc_indma) 619 fddmadone(fdc_indma, 0); 620 splx(s); 621 } 622 623 void 624 fdidxintr(void) 625 { 626 if (fdc_indma && fdc_dmalen) { 627 /* 628 * turn off intr and start actual dma 629 */ 630 ciab.icr = CIA_ICR_FLG; 631 FDDMASTART(fdc_dmalen, fdc_dmawrite); 632 fdc_dmalen = 0; 633 } 634 } 635 636 void 637 fdstrategy(struct buf *bp) 638 { 639 struct disklabel *lp; 640 struct fd_softc *sc; 641 int unit, part, s; 642 643 unit = FDUNIT(bp->b_dev); 644 part = FDPART(bp->b_dev); 645 sc = getsoftc(fd_cd, unit); 646 647 #ifdef FDDEBUG 648 printf("fdstrategy: 0x%x\n", bp); 649 #endif 650 /* 651 * check for valid partition and bounds 652 */ 653 lp = sc->dkdev.dk_label; 654 if ((sc->flags & FDF_HAVELABEL) == 0) { 655 bp->b_error = EIO; 656 goto bad; 657 } 658 if (bounds_check_with_label(bp, lp, sc->wlabel) <= 0) 659 goto done; 660 661 /* 662 * trans count of zero or bounds check indicates io is done 663 * we are done. 664 */ 665 if (bp->b_bcount == 0) 666 goto done; 667 668 bp->b_rawblkno = bp->b_blkno; 669 670 /* 671 * queue the buf and kick the low level code 672 */ 673 s = splbio(); 674 disksort_cylinder(&sc->bufq, bp); 675 fdstart(sc); 676 splx(s); 677 return; 678 bad: 679 bp->b_flags |= B_ERROR; 680 done: 681 bp->b_resid = bp->b_bcount; 682 biodone(bp); 683 } 684 685 /* 686 * make sure disk is loaded and label is up-to-date. 687 */ 688 int 689 fdloaddisk(struct fd_softc *sc) 690 { 691 /* 692 * if diskchange is low step drive to 0 then up one then to zero. 693 */ 694 fdselunit(sc); /* make sure the unit is selected */ 695 if (FDTESTC(FDB_CHANGED)) { 696 fdsetpos(sc, 0, 0); 697 sc->cachetrk = -1; /* invalidate the cache */ 698 sc->flags &= ~FDF_HAVELABEL; 699 fdsetpos(sc, FDNHEADS, 0); 700 fdsetpos(sc, 0, 0); 701 if (FDTESTC(FDB_CHANGED)) { 702 fdmotoroff(sc); 703 FDDESELECT(sc->unitmask); 704 return(ENXIO); 705 } 706 } 707 FDDESELECT(sc->unitmask); 708 fdmotoroff(sc); 709 sc->type = fdcgetfdtype(sc->hwunit); 710 if (sc->type == NULL) 711 return(ENXIO); 712 if (sc->openpart == FDMSDOSPART) 713 sc->nsectors = sc->type->msdos_nsectors; 714 else 715 sc->nsectors = sc->type->amiga_nsectors; 716 return(0); 717 } 718 719 void 720 fdgetdefaultlabel(struct fd_softc *sc, struct disklabel *lp, int part) 721 /* (variable part) XXX ick */ 722 { 723 724 bzero(lp, sizeof(struct disklabel)); 725 lp->d_secsize = FDSECSIZE; 726 lp->d_ntracks = FDNHEADS; 727 lp->d_ncylinders = sc->type->ncylinders; 728 lp->d_nsectors = sc->nsectors; 729 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 730 lp->d_type = DTYPE_FLOPPY; 731 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 732 lp->d_rpm = 300; /* good guess I suppose. */ 733 lp->d_interleave = 1; /* should change when adding msdos */ 734 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 735 lp->d_bbsize = 0; 736 lp->d_sbsize = 0; 737 lp->d_partitions[part].p_size = lp->d_secperunit; 738 lp->d_partitions[part].p_fstype = FS_UNUSED; 739 lp->d_partitions[part].p_fsize = 1024; 740 lp->d_partitions[part].p_frag = 8; 741 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 742 lp->d_npartitions = part + 1; 743 lp->d_magic = lp->d_magic2 = DISKMAGIC; 744 lp->d_checksum = dkcksum(lp); 745 } 746 747 /* 748 * read disk label, if present otherwise create one 749 * return a new label if raw part and none found, otherwise err. 750 */ 751 int 752 fdgetdisklabel(struct fd_softc *sc, dev_t dev) 753 { 754 struct disklabel *lp, *dlp; 755 struct cpu_disklabel *clp; 756 struct buf *bp; 757 int error, part; 758 759 if (sc->flags & FDF_HAVELABEL && 760 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 761 return(0); 762 #ifdef FDDEBUG 763 printf("fdgetdisklabel()\n"); 764 #endif 765 part = FDPART(dev); 766 lp = sc->dkdev.dk_label; 767 clp = sc->dkdev.dk_cpulabel; 768 bzero(lp, sizeof(struct disklabel)); 769 bzero(clp, sizeof(struct cpu_disklabel)); 770 771 lp->d_secsize = FDSECSIZE; 772 lp->d_ntracks = FDNHEADS; 773 lp->d_ncylinders = sc->type->ncylinders; 774 lp->d_nsectors = sc->nsectors; 775 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 776 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 777 lp->d_npartitions = part + 1; 778 lp->d_partitions[part].p_size = lp->d_secperunit; 779 lp->d_partitions[part].p_fstype = FS_UNUSED; 780 lp->d_partitions[part].p_fsize = 1024; 781 lp->d_partitions[part].p_frag = 8; 782 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 783 784 sc->flags |= FDF_HAVELABEL; 785 786 bp = (void *)geteblk((int)lp->d_secsize); 787 bp->b_dev = dev; 788 bp->b_blkno = 0; 789 bp->b_cylinder = 0; 790 bp->b_bcount = FDSECSIZE; 791 bp->b_flags |= B_READ; 792 fdstrategy(bp); 793 if ((error = biowait(bp)) != 0) 794 goto nolabel; 795 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 796 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 797 dkcksum(dlp)) { 798 error = EINVAL; 799 goto nolabel; 800 } 801 bcopy(dlp, lp, sizeof(struct disklabel)); 802 if (lp->d_trkseek > FDSTEPDELAY) 803 sc->stepdelay = lp->d_trkseek; 804 brelse(bp); 805 return(0); 806 nolabel: 807 fdgetdefaultlabel(sc, lp, part); 808 brelse(bp); 809 return(0); 810 } 811 812 /* 813 * set the incore copy of this units disklabel 814 */ 815 int 816 fdsetdisklabel(struct fd_softc *sc, struct disklabel *lp) 817 { 818 struct disklabel *clp; 819 struct partition *pp; 820 821 /* 822 * must have at least opened raw unit to fetch the 823 * raw_part stuff. 824 */ 825 if ((sc->flags & FDF_HAVELABEL) == 0) 826 return(EINVAL); 827 clp = sc->dkdev.dk_label; 828 /* 829 * make sure things check out and we only have one valid 830 * partition 831 */ 832 #ifdef FDDEBUG 833 printf("fdsetdisklabel\n"); 834 #endif 835 if (lp->d_secsize != FDSECSIZE || 836 lp->d_nsectors != clp->d_nsectors || 837 lp->d_ntracks != FDNHEADS || 838 lp->d_ncylinders != clp->d_ncylinders || 839 lp->d_secpercyl != clp->d_secpercyl || 840 lp->d_secperunit != clp->d_secperunit || 841 lp->d_magic != DISKMAGIC || 842 lp->d_magic2 != DISKMAGIC || 843 lp->d_npartitions == 0 || 844 lp->d_npartitions > FDMAXPARTS || 845 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 846 dkcksum(lp)) 847 return(EINVAL); 848 /* 849 * if any partitions are present make sure they 850 * represent the currently open type 851 */ 852 if ((pp = &lp->d_partitions[0])->p_size) { 853 if ((pp = &lp->d_partitions[1])->p_size == 0) 854 goto done; 855 else if (sc->openpart != 1) 856 return(EINVAL); 857 } else if (sc->openpart != 0) 858 return(EINVAL); 859 /* 860 * make sure selected partition is within bounds 861 * XXX on the second check, its to handle a bug in 862 * XXX the cluster routines as they require mutliples 863 * XXX of NBPG currently 864 */ 865 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 866 (pp->p_frag * pp->p_fsize % NBPG)) 867 return(EINVAL); 868 done: 869 bcopy(lp, clp, sizeof(struct disklabel)); 870 return(0); 871 } 872 873 /* 874 * write out the incore copy of this units disklabel 875 */ 876 int 877 fdputdisklabel(struct fd_softc *sc, dev_t dev) 878 { 879 struct disklabel *lp, *dlp; 880 struct buf *bp; 881 int error; 882 883 if ((sc->flags & FDF_HAVELABEL) == 0) 884 return(EBADF); 885 #ifdef FDDEBUG 886 printf("fdputdisklabel\n"); 887 #endif 888 /* 889 * get buf and read in sector 0 890 */ 891 lp = sc->dkdev.dk_label; 892 bp = geteblk((int)lp->d_secsize); 893 bp->b_dev = FDMAKEDEV(major(dev), FDUNIT(dev), RAW_PART); 894 bp->b_blkno = 0; 895 bp->b_cylinder = 0; 896 bp->b_bcount = FDSECSIZE; 897 bp->b_flags |= B_READ; 898 fdstrategy(bp); 899 if ((error = biowait(bp)) != 0) 900 goto done; 901 /* 902 * copy disklabel to buf and write it out syncronous 903 */ 904 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 905 bcopy(lp, dlp, sizeof(struct disklabel)); 906 bp->b_blkno = 0; 907 bp->b_cylinder = 0; 908 bp->b_flags &= ~(B_READ|B_DONE); 909 bp->b_flags |= B_WRITE; 910 fdstrategy(bp); 911 error = biowait(bp); 912 done: 913 brelse(bp); 914 return(error); 915 } 916 917 /* 918 * figure out drive type or NULL if none. 919 */ 920 struct fdtype * 921 fdcgetfdtype(int unit) 922 { 923 struct fdtype *ftp; 924 u_long id, idb; 925 int cnt, umask; 926 927 id = 0; 928 umask = 1 << (3 + unit); 929 930 FDDESELECT(FDCUNITMASK); 931 932 FDSETMOTOR(1); 933 delay(1); 934 FDSELECT(umask); 935 delay(1); 936 FDDESELECT(umask); 937 938 FDSETMOTOR(0); 939 delay(1); 940 FDSELECT(umask); 941 delay(1); 942 FDDESELECT(umask); 943 944 for (idb = 0x80000000; idb; idb >>= 1) { 945 FDSELECT(umask); 946 delay(1); 947 if (FDTESTC(FDB_READY) == 0) 948 id |= idb; 949 FDDESELECT(umask); 950 delay(1); 951 } 952 #ifdef FDDEBUG 953 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 954 #endif 955 956 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 957 if (ftp->driveid == id) 958 return(ftp); 959 /* 960 * 3.5dd's at unit 0 do not always return id. 961 */ 962 if (unit == 0) 963 return(fdtype); 964 return(NULL); 965 } 966 967 /* 968 * turn motor off if possible otherwise mark as needed and will be done 969 * later. 970 */ 971 void 972 fdmotoroff(void *arg) 973 { 974 struct fd_softc *sc; 975 int s; 976 977 sc = arg; 978 s = splbio(); 979 980 #ifdef FDDEBUG 981 printf("fdmotoroff: unit %d\n", sc->hwunit); 982 #endif 983 if ((sc->flags & FDF_MOTORON) == 0) 984 goto done; 985 /* 986 * if we have a timeout on a dma operation let fddmadone() 987 * deal with it. 988 */ 989 if (fdc_indma == sc) { 990 fddmadone(sc, 1); 991 goto done; 992 } 993 #ifdef FDDEBUG 994 printf(" motor was on, turning off\n"); 995 #endif 996 997 /* 998 * flush cache if needed 999 */ 1000 if (sc->flags & FDF_DIRTY) { 1001 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1002 #ifdef FDDEBUG 1003 printf(" flushing dirty buffer first\n"); 1004 #endif 1005 /* 1006 * if dma'ing done for now, fddone() will call us again 1007 */ 1008 if (fdc_indma) 1009 goto done; 1010 fddmastart(sc, sc->cachetrk); 1011 goto done; 1012 } 1013 1014 /* 1015 * if controller is busy just schedule us to be called back 1016 */ 1017 if (fdc_indma) { 1018 /* 1019 * someone else has the controller now 1020 * just set flag and let fddone() call us again. 1021 */ 1022 sc->flags |= FDF_MOTOROFF; 1023 goto done; 1024 } 1025 1026 #ifdef FDDEBUG 1027 printf(" hw turning unit off\n"); 1028 #endif 1029 1030 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1031 FDDESELECT(FDCUNITMASK); 1032 FDSETMOTOR(0); 1033 delay(1); 1034 FDSELECT(sc->unitmask); 1035 delay(4); 1036 FDDESELECT(sc->unitmask); 1037 delay(1); 1038 if (sc->flags & FDF_WMOTOROFF) 1039 wakeup(fdmotoroff); 1040 done: 1041 splx(s); 1042 } 1043 1044 /* 1045 * select drive seek to track exit with motor on. 1046 * fdsetpos(x, 0, 0) does calibrates the drive. 1047 */ 1048 void 1049 fdsetpos(struct fd_softc *sc, int trk, int towrite) 1050 { 1051 int nstep, sdir, ondly, ncyl, nside; 1052 1053 FDDESELECT(FDCUNITMASK); 1054 FDSETMOTOR(1); 1055 delay(1); 1056 FDSELECT(sc->unitmask); 1057 delay(1); 1058 if ((sc->flags & FDF_MOTORON) == 0) { 1059 ondly = 0; 1060 while (FDTESTC(FDB_READY) == 0) { 1061 delay(1000); 1062 if (++ondly >= 1000) 1063 break; 1064 } 1065 } 1066 sc->flags |= FDF_MOTORON; 1067 1068 ncyl = trk / FDNHEADS; 1069 nside = trk % FDNHEADS; 1070 1071 if (sc->curcyl == ncyl && fdc_side == nside) 1072 return; 1073 1074 if (towrite) 1075 sc->flags |= FDF_WRITEWAIT; 1076 1077 #ifdef FDDEBUG 1078 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1079 trk % FDNHEADS, towrite); 1080 #endif 1081 nstep = ncyl - sc->curcyl; 1082 if (nstep) { 1083 /* 1084 * figure direction 1085 */ 1086 if (nstep > 0 && ncyl != 0) { 1087 sdir = FDSTEPIN; 1088 FDSETDIR(1); 1089 } else { 1090 nstep = -nstep; 1091 sdir = FDSTEPOUT; 1092 FDSETDIR(0); 1093 } 1094 if (ncyl == 0) { 1095 /* 1096 * either just want cylinder 0 or doing 1097 * a calibrate. 1098 */ 1099 nstep = 256; 1100 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1101 FDSTEP; 1102 delay(sc->stepdelay); 1103 } 1104 if (nstep < 0) 1105 sc->flags |= FDF_NOTRACK0; 1106 } else { 1107 /* 1108 * step the needed amount amount. 1109 */ 1110 while (nstep--) { 1111 FDSTEP; 1112 delay(sc->stepdelay); 1113 } 1114 } 1115 /* 1116 * if switched directions 1117 * allow drive to settle. 1118 */ 1119 if (sc->pstepdir != sdir) 1120 delay(FDSETTLEDELAY); 1121 sc->pstepdir = sdir; 1122 sc->curcyl = ncyl; 1123 } 1124 if (nside == fdc_side) 1125 return; 1126 /* 1127 * select side 1128 */ 1129 fdc_side = nside; 1130 FDSETHEAD(nside); 1131 delay(FDPRESIDEDELAY); 1132 } 1133 1134 void 1135 fdselunit(struct fd_softc *sc) 1136 { 1137 FDDESELECT(FDCUNITMASK); /* deselect all */ 1138 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1139 delay(1); 1140 FDSELECT(sc->unitmask); /* select unit */ 1141 delay(1); 1142 } 1143 1144 /* 1145 * process next buf on device queue. 1146 * normall sequence of events: 1147 * fdstart() -> fddmastart(); 1148 * fdidxintr(); 1149 * fdintr() -> fddmadone() -> fddone(); 1150 * if the track is in the cache then fdstart() will short-circuit 1151 * to fddone() else if the track cache is dirty it will flush. If 1152 * the buf is not an entire track it will cache the requested track. 1153 */ 1154 void 1155 fdstart(struct fd_softc *sc) 1156 { 1157 int trk, error, write; 1158 struct buf *bp, *dp; 1159 int changed; 1160 1161 #ifdef FDDEBUG 1162 printf("fdstart: unit %d\n", sc->hwunit); 1163 #endif 1164 1165 /* 1166 * if dma'ing just return. we must have been called from fdstartegy. 1167 */ 1168 if (fdc_indma) 1169 return; 1170 1171 /* 1172 * get next buf if there. 1173 */ 1174 dp = &sc->curbuf; 1175 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) { 1176 #ifdef FDDEBUG 1177 printf(" nothing to do\n"); 1178 #endif 1179 return; 1180 } 1181 1182 /* 1183 * Mark us as busy now, in case fddone() gets called in one 1184 * of the cases below. 1185 */ 1186 disk_busy(&sc->dkdev); 1187 1188 /* 1189 * make sure same disk is loaded 1190 */ 1191 fdselunit(sc); 1192 changed = FDTESTC(FDB_CHANGED); 1193 FDDESELECT(sc->unitmask); 1194 if (changed) { 1195 /* 1196 * disk missing, invalidate all future io on 1197 * this unit until re-open()'ed also invalidate 1198 * all current io 1199 */ 1200 printf("fdstart: disk changed\n"); 1201 #ifdef FDDEBUG 1202 printf(" disk was removed invalidating all io\n"); 1203 #endif 1204 sc->flags &= ~FDF_HAVELABEL; 1205 for (;;) { 1206 bp->b_flags |= B_ERROR; 1207 bp->b_error = EIO; 1208 if (BUFQ_NEXT(bp) == NULL) 1209 break; 1210 biodone(bp); 1211 bp = BUFQ_NEXT(bp); 1212 } 1213 /* 1214 * do fddone() on last buf to allow other units to start. 1215 */ 1216 BUFQ_INSERT_HEAD(&sc->bufq, bp); 1217 fddone(sc); 1218 return; 1219 } 1220 1221 /* 1222 * we have a valid buf, setup our local version 1223 * we use this count to allow reading over multiple tracks. 1224 * into a single buffer 1225 */ 1226 dp->b_bcount = bp->b_bcount; 1227 dp->b_blkno = bp->b_blkno; 1228 dp->b_data = bp->b_data; 1229 dp->b_flags = bp->b_flags; 1230 dp->b_resid = 0; 1231 1232 if (bp->b_flags & B_READ) 1233 write = 0; 1234 else if (FDTESTC(FDB_PROTECT) == 0) 1235 write = 1; 1236 else { 1237 error = EPERM; 1238 goto bad; 1239 } 1240 1241 /* 1242 * figure trk given blkno 1243 */ 1244 trk = bp->b_blkno / sc->nsectors; 1245 1246 /* 1247 * check to see if same as currently cached track 1248 * if so we need to do no dma read. 1249 */ 1250 if (trk == sc->cachetrk) { 1251 fddone(sc); 1252 return; 1253 } 1254 1255 /* 1256 * if we will be overwriting the entire cache, don't bother to 1257 * fetch it. 1258 */ 1259 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1260 bp->b_blkno % sc->nsectors == 0) { 1261 if (sc->flags & FDF_DIRTY) 1262 sc->flags |= FDF_JUSTFLUSH; 1263 else { 1264 sc->cachetrk = trk; 1265 fddone(sc); 1266 return; 1267 } 1268 } 1269 1270 /* 1271 * start dma read of `trk' 1272 */ 1273 fddmastart(sc, trk); 1274 return; 1275 bad: 1276 bp->b_flags |= B_ERROR; 1277 bp->b_error = error; 1278 fddone(sc); 1279 } 1280 1281 /* 1282 * continue a started operation on next track. always begin at 1283 * sector 0 on the next track. 1284 */ 1285 void 1286 fdcont(struct fd_softc *sc) 1287 { 1288 struct buf *dp, *bp; 1289 int trk, write; 1290 1291 dp = &sc->curbuf; 1292 bp = BUFQ_FIRST(&sc->bufq); 1293 dp->b_data += (dp->b_bcount - bp->b_resid); 1294 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1295 dp->b_bcount = bp->b_resid; 1296 1297 /* 1298 * figure trk given blkno 1299 */ 1300 trk = dp->b_blkno / sc->nsectors; 1301 #ifdef DEBUG 1302 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1303 panic("fdcont: confused"); 1304 #endif 1305 if (dp->b_flags & B_READ) 1306 write = 0; 1307 else 1308 write = 1; 1309 /* 1310 * if we will be overwriting the entire cache, don't bother to 1311 * fetch it. 1312 */ 1313 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1314 if (sc->flags & FDF_DIRTY) 1315 sc->flags |= FDF_JUSTFLUSH; 1316 else { 1317 sc->cachetrk = trk; 1318 fddone(sc); 1319 return; 1320 } 1321 } 1322 /* 1323 * start dma read of `trk' 1324 */ 1325 fddmastart(sc, trk); 1326 return; 1327 } 1328 1329 void 1330 fddmastart(struct fd_softc *sc, int trk) 1331 { 1332 int adkmask, ndmaw, write, dmatrk; 1333 1334 #ifdef FDDEBUG 1335 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1336 trk / FDNHEADS, trk % FDNHEADS); 1337 #endif 1338 /* 1339 * flush the cached track if dirty else read requested track. 1340 */ 1341 if (sc->flags & FDF_DIRTY) { 1342 fdcachetoraw(sc); 1343 ndmaw = sc->type->nwritew; 1344 dmatrk = sc->cachetrk; 1345 write = 1; 1346 } else { 1347 ndmaw = sc->type->nreadw; 1348 dmatrk = trk; 1349 write = 0; 1350 } 1351 1352 #ifdef FDDEBUG 1353 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1354 #endif 1355 sc->cachetrk = trk; 1356 fdc_indma = sc; 1357 fdsetpos(sc, dmatrk, write); 1358 1359 /* 1360 * setup dma stuff 1361 */ 1362 if (write == 0) { 1363 custom.adkcon = ADKF_MSBSYNC; 1364 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1365 custom.dsksync = FDMFMSYNC; 1366 } else { 1367 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1368 ADKF_MSBSYNC; 1369 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1370 if (dmatrk >= sc->type->precomp[0]) 1371 adkmask |= ADKF_PRECOMP0; 1372 if (dmatrk >= sc->type->precomp[1]) 1373 adkmask |= ADKF_PRECOMP1; 1374 custom.adkcon = adkmask; 1375 } 1376 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1377 1378 /* 1379 * If writing an MSDOS track, activate disk index pulse 1380 * interrupt, dma will be started in the intr routine fdidxintr() 1381 * Otherwise, start the DMA here. 1382 */ 1383 if (write && sc->openpart == FDMSDOSPART) { 1384 fdc_dmalen = ndmaw; 1385 fdc_dmawrite = write; 1386 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1387 } else { 1388 FDDMASTART(ndmaw, write); 1389 fdc_dmalen = 0; 1390 } 1391 1392 #ifdef FDDEBUG 1393 printf(" dma started\n"); 1394 #endif 1395 } 1396 1397 /* 1398 * recalibrate the drive 1399 */ 1400 void 1401 fdcalibrate(void *arg) 1402 { 1403 struct fd_softc *sc; 1404 static int loopcnt; 1405 1406 sc = arg; 1407 1408 if (loopcnt == 0) { 1409 /* 1410 * seek cyl 0 1411 */ 1412 fdc_indma = sc; 1413 sc->stepdelay += 900; 1414 if (sc->cachetrk > 1) 1415 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1416 sc->stepdelay -= 900; 1417 } 1418 if (loopcnt++ & 1) 1419 fdsetpos(sc, sc->cachetrk, 0); 1420 else 1421 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1422 /* 1423 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1424 */ 1425 if (loopcnt < 8) 1426 callout_reset(&sc->calibrate_ch, hz / 8, fdcalibrate, sc); 1427 else { 1428 loopcnt = 0; 1429 fdc_indma = NULL; 1430 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1431 fddmastart(sc, sc->cachetrk); 1432 } 1433 } 1434 1435 void 1436 fddmadone(struct fd_softc *sc, int timeo) 1437 { 1438 #ifdef FDDEBUG 1439 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1440 #endif 1441 fdc_indma = NULL; 1442 callout_stop(&sc->motor_ch); 1443 FDDMASTOP; 1444 1445 /* 1446 * guarantee the drive has been at current head and cyl 1447 * for at least FDWRITEDELAY after a write. 1448 */ 1449 if (sc->flags & FDF_WRITEWAIT) { 1450 delay(FDWRITEDELAY); 1451 sc->flags &= ~FDF_WRITEWAIT; 1452 } 1453 1454 if ((sc->flags & FDF_MOTOROFF) == 0) { 1455 /* 1456 * motor runs for 1.5 seconds after last dma 1457 */ 1458 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1459 } 1460 if (sc->flags & FDF_DIRTY) { 1461 /* 1462 * if buffer dirty, the last dma cleaned it 1463 */ 1464 sc->flags &= ~FDF_DIRTY; 1465 if (timeo) 1466 printf("%s: write of track cache timed out.\n", 1467 sc->sc_dv.dv_xname); 1468 if (sc->flags & FDF_JUSTFLUSH) { 1469 sc->flags &= ~FDF_JUSTFLUSH; 1470 /* 1471 * we are done dma'ing 1472 */ 1473 fddone(sc); 1474 return; 1475 } 1476 /* 1477 * load the cache 1478 */ 1479 fddmastart(sc, sc->cachetrk); 1480 return; 1481 } 1482 #ifdef FDDEBUG 1483 else if (sc->flags & FDF_MOTOROFF) 1484 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1485 #endif 1486 1487 /* 1488 * cache loaded decode it into cache buffer 1489 */ 1490 if (timeo == 0 && fdrawtocache(sc) == 0) 1491 sc->retried = 0; 1492 else { 1493 #ifdef FDDEBUG 1494 if (timeo) 1495 printf("%s: fddmadone: cache load timed out.\n", 1496 sc->sc_dv.dv_xname); 1497 #endif 1498 if (sc->retried >= sc->retries) { 1499 sc->retried = 0; 1500 sc->cachetrk = -1; 1501 } else { 1502 sc->retried++; 1503 /* 1504 * this will be restarted at end of calibrate loop. 1505 */ 1506 callout_stop(&sc->motor_ch); 1507 fdcalibrate(sc); 1508 return; 1509 } 1510 } 1511 fddone(sc); 1512 } 1513 1514 void 1515 fddone(struct fd_softc *sc) 1516 { 1517 struct buf *dp, *bp; 1518 char *data; 1519 int sz; 1520 1521 #ifdef FDDEBUG 1522 printf("fddone: unit %d\n", sc->hwunit); 1523 #endif 1524 /* 1525 * check to see if unit is just flushing the cache, 1526 * that is we have no io queued. 1527 */ 1528 if (sc->flags & FDF_MOTOROFF) 1529 goto nobuf; 1530 1531 dp = &sc->curbuf; 1532 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) 1533 panic ("fddone"); 1534 /* 1535 * check for an error that may have occurred 1536 * while getting the track. 1537 */ 1538 if (sc->cachetrk == -1) { 1539 sc->retried = 0; 1540 bp->b_flags |= B_ERROR; 1541 bp->b_error = EIO; 1542 } else if ((bp->b_flags & B_ERROR) == 0) { 1543 data = sc->cachep; 1544 /* 1545 * get offset of data in track cache and limit 1546 * the copy size to not exceed the cache's end. 1547 */ 1548 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1549 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1550 sz *= FDSECSIZE; 1551 sz = min(dp->b_bcount, sz); 1552 if (bp->b_flags & B_READ) 1553 bcopy(data, dp->b_data, sz); 1554 else { 1555 bcopy(dp->b_data, data, sz); 1556 sc->flags |= FDF_DIRTY; 1557 } 1558 bp->b_resid = dp->b_bcount - sz; 1559 if (bp->b_resid == 0) { 1560 bp->b_error = 0; 1561 } else { 1562 /* 1563 * not done yet need to read next track 1564 */ 1565 fdcont(sc); 1566 return; 1567 } 1568 } 1569 /* 1570 * remove from queue. 1571 */ 1572 BUFQ_REMOVE(&sc->bufq, bp); 1573 1574 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1575 1576 biodone(bp); 1577 nobuf: 1578 fdfindwork(sc->sc_dv.dv_unit); 1579 } 1580 1581 void 1582 fdfindwork(int unit) 1583 { 1584 struct fd_softc *ssc, *sc; 1585 int i, last; 1586 1587 /* 1588 * first see if we have any fdopen()'s waiting 1589 */ 1590 if (fdc_wantwakeup) { 1591 wakeup(fdopen); 1592 fdc_wantwakeup--; 1593 return; 1594 } 1595 1596 /* 1597 * start next available unit, linear search from the next unit 1598 * wrapping and finally this unit. 1599 */ 1600 last = 0; 1601 ssc = NULL; 1602 for (i = unit + 1; last == 0; i++) { 1603 if (i == unit) 1604 last = 1; 1605 if (i >= fd_cd.cd_ndevs) { 1606 i = -1; 1607 continue; 1608 } 1609 if ((sc = fd_cd.cd_devs[i]) == NULL) 1610 continue; 1611 1612 /* 1613 * if unit has requested to be turned off 1614 * and it has no buf's queued do it now 1615 */ 1616 if (sc->flags & FDF_MOTOROFF) { 1617 if (BUFQ_FIRST(&sc->bufq) == NULL) 1618 fdmotoroff(sc); 1619 else { 1620 /* 1621 * we gained a buf request while 1622 * we waited, forget the motoroff 1623 */ 1624 sc->flags &= ~FDF_MOTOROFF; 1625 } 1626 /* 1627 * if we now have dma unit must have needed 1628 * flushing, quit 1629 */ 1630 if (fdc_indma) 1631 return; 1632 } 1633 /* 1634 * if we have no start unit and the current unit has 1635 * io waiting choose this unit to start. 1636 */ 1637 if (ssc == NULL && BUFQ_FIRST(&sc->bufq) != NULL) 1638 ssc = sc; 1639 } 1640 if (ssc) 1641 fdstart(ssc); 1642 } 1643 1644 /* 1645 * min byte count to whats left of the track in question 1646 */ 1647 void 1648 fdminphys(struct buf *bp) 1649 { 1650 struct fd_softc *sc; 1651 int trk, sec, toff, tsz; 1652 1653 if ((sc = getsoftc(fd_cd, FDUNIT(bp->b_dev))) == NULL) 1654 panic("fdminphys: couldn't get softc"); 1655 1656 trk = bp->b_blkno / sc->nsectors; 1657 sec = bp->b_blkno % sc->nsectors; 1658 1659 toff = sec * FDSECSIZE; 1660 tsz = sc->nsectors * FDSECSIZE; 1661 #ifdef FDDEBUG 1662 printf("fdminphys: before %d", bp->b_bcount); 1663 #endif 1664 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1665 #ifdef FDDEBUG 1666 printf(" after %d\n", bp->b_bcount); 1667 #endif 1668 minphys(bp); 1669 } 1670 1671 /* 1672 * encode the track cache into raw MFM ready for dma 1673 * when we go to multiple disk formats, this will call type dependent 1674 * functions 1675 */ 1676 void fdcachetoraw(struct fd_softc *sc) 1677 { 1678 if (sc->openpart == FDMSDOSPART) 1679 mscachetoraw(sc); 1680 else 1681 amcachetoraw(sc); 1682 } 1683 1684 /* 1685 * decode raw MFM from dma into units track cache. 1686 * when we go to multiple disk formats, this will call type dependent 1687 * functions 1688 */ 1689 int 1690 fdrawtocache(struct fd_softc *sc) 1691 { 1692 1693 if (sc->openpart == FDMSDOSPART) 1694 return(msrawtocache(sc)); 1695 else 1696 return(amrawtocache(sc)); 1697 } 1698 1699 void 1700 amcachetoraw(struct fd_softc *sc) 1701 { 1702 static u_long mfmnull[4]; 1703 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1704 int sec, i; 1705 1706 rp = fdc_dmap; 1707 1708 /* 1709 * not yet one sector (- 1 long) gap. 1710 * for now use previous drivers values 1711 */ 1712 for (i = 0; i < sc->type->gap; i++) 1713 *rp++ = 0xaaaaaaaa; 1714 /* 1715 * process sectors 1716 */ 1717 dp = sc->cachep; 1718 zero = 0; 1719 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1720 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1721 hcksum = dcksum = 0; 1722 /* 1723 * sector format 1724 * offset description 1725 *----------------------------------- 1726 * 0 null 1727 * 1 sync 1728 * oddbits evenbits 1729 *---------------------- 1730 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1731 * 4-7 8-11 null 1732 * 12 13 header cksum [2-11] 1733 * 14 15 data cksum [16-271] 1734 * 16-143 144-271 data 1735 */ 1736 *rp = 0xaaaaaaaa; 1737 if (*(rp - 1) & 0x1) 1738 *rp &= 0x7fffffff; /* clock bit correction */ 1739 rp++; 1740 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1741 rp = mfmblkencode(&info, rp, &hcksum, 1); 1742 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1743 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1744 1745 crp = rp; 1746 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1747 dp += FDSECLWORDS; 1748 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1749 if (*(crp - 1) & 0x1) 1750 *crp &= 0x7fffffff; /* clock bit correction */ 1751 else if ((*crp & 0x40000000) == 0) 1752 *crp |= 0x80000000; 1753 } 1754 *rp = 0xaaa80000; 1755 if (*(rp - 1) & 0x1) 1756 *rp &= 0x7fffffff; 1757 } 1758 1759 u_long * 1760 fdfindsync(u_long *rp, u_long *ep) 1761 { 1762 u_short *sp; 1763 1764 sp = (u_short *)rp; 1765 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1766 sp++; 1767 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1768 sp++; 1769 if ((u_long *)sp < ep) 1770 return((u_long *)sp); 1771 return(NULL); 1772 } 1773 1774 int 1775 amrawtocache(struct fd_softc *sc) 1776 { 1777 u_long mfmnull[4]; 1778 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1779 int cnt, doagain; 1780 1781 doagain = 1; 1782 srp = rp = fdc_dmap; 1783 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1784 cnt = 0; 1785 again: 1786 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1787 #ifdef DIAGNOSTIC 1788 printf("%s: corrupted track (%d) data.\n", 1789 sc->sc_dv.dv_xname, sc->cachetrk); 1790 #endif 1791 return(-1); 1792 } 1793 1794 /* 1795 * process sectors 1796 */ 1797 for (; cnt < sc->nsectors; cnt++) { 1798 hcksum = dcksum = 0; 1799 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1800 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1801 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1802 if (cktmp != hcksum) { 1803 #ifdef FDDEBUG 1804 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1805 info, hcksum, cktmp); 1806 #endif 1807 goto again; 1808 } 1809 if (((info >> 16) & 0xff) != sc->cachetrk) { 1810 #ifdef DEBUG 1811 printf("%s: incorrect track found: 0x%lx %d\n", 1812 sc->sc_dv.dv_xname, info, sc->cachetrk); 1813 #endif 1814 goto again; 1815 } 1816 #ifdef FDDEBUG 1817 printf(" info 0x%x\n", info); 1818 #endif 1819 1820 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1821 dp = sc->cachep; 1822 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1823 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1824 if (cktmp != dcksum) { 1825 #ifdef FDDEBUG 1826 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1827 info, dcksum, cktmp); 1828 #endif 1829 goto again; 1830 } 1831 1832 /* 1833 * if we are at gap then we can no longer be sure 1834 * of correct sync marks 1835 */ 1836 if ((info && 0xff) == 1) 1837 doagain = 1; 1838 else 1839 doagain = 0; 1840 srp = rp = fdfindsync(crp, erp); 1841 } 1842 return(0); 1843 } 1844 1845 void 1846 mscachetoraw(struct fd_softc *sc) 1847 { 1848 u_short *rp, *erp, crc; 1849 u_char *cp, tb[5]; 1850 int sec, i; 1851 1852 rp = (u_short *)fdc_dmap; 1853 erp = rp + sc->type->nwritew; 1854 cp = sc->cachep; 1855 1856 /* 1857 * initial track filler (828 * GAP1) 1858 */ 1859 for (i = 0; i < sc->type->gap; i++) { 1860 *rp++ = FDMFMGAP1; 1861 *rp++ = FDMFMGAP1; 1862 } 1863 1864 for (sec = 0; sec < sc->nsectors; sec++) { 1865 1866 /* 1867 * leading sector gap 1868 * (12 * GAP2) + (3 * SYNC) 1869 */ 1870 for (i = 0; i < 12; i++) 1871 *rp++ = FDMFMGAP2; 1872 *rp++ = FDMFMSYNC; 1873 *rp++ = FDMFMSYNC; 1874 *rp++ = FDMFMSYNC; 1875 1876 /* 1877 * sector information 1878 * (ID) + track + side + sector + sector size + CRC16 1879 */ 1880 *rp++ = FDMFMID; 1881 tb[0] = sc->cachetrk / FDNHEADS; 1882 tb[1] = sc->cachetrk % FDNHEADS; 1883 tb[2] = sec + 1; 1884 i = sc->bytespersec; 1885 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1886 rp = msblkencode(rp, tb, 4, &crc); 1887 tb[0] = crc >> 8; 1888 tb[1] = crc & 0xff; 1889 tb[2] = 0x4e; /* GAP1 decoded */ 1890 rp = msblkencode(rp, tb, 3, 0); 1891 1892 /* 1893 * sector info/data gap 1894 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1895 */ 1896 for (i = 0; i < 21; i++) 1897 *rp++ = FDMFMGAP1; 1898 for (i = 0; i < 12; i++) 1899 *rp++ = FDMFMGAP2; 1900 *rp++ = FDMFMSYNC; 1901 *rp++ = FDMFMSYNC; 1902 *rp++ = FDMFMSYNC; 1903 1904 /* 1905 * sector data 1906 * (DATA) + ...data... + CRC16 1907 */ 1908 *rp++ = FDMFMDATA; 1909 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1910 cp += sc->bytespersec; 1911 tb[0] = crc >> 8; 1912 tb[1] = crc & 0xff; 1913 tb[2] = 0x4e; /* GAP3 decoded */ 1914 rp = msblkencode(rp, tb, 3, 0); 1915 1916 /* 1917 * trailing sector gap 1918 * (80 * GAP3) 1919 */ 1920 for (i = 0; i < 79; i++) 1921 *rp++ = FDMFMGAP3; 1922 } 1923 1924 /* 1925 * fill rest of track with GAP3 1926 */ 1927 while (rp != erp) 1928 *rp++ = FDMFMGAP3; 1929 1930 } 1931 1932 int 1933 msrawtocache(struct fd_softc *sc) 1934 { 1935 u_short *rp, *srp, *erp; 1936 u_char tb[5], *cp; 1937 int ct, sec, retry; 1938 1939 srp = rp = (u_short *)fdc_dmap; 1940 erp = rp + sc->type->nreadw; 1941 cp = sc->cachep; 1942 1943 for (ct = 0; ct < sc->nsectors; ct++) { 1944 retry = 1; 1945 do { 1946 /* 1947 * skip leading gap to sync 1948 */ 1949 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 1950 #ifdef DIAGNOSTIC 1951 printf("%s: corrupted track (%d) data.\n", 1952 sc->sc_dv.dv_xname, sc->cachetrk); 1953 #endif 1954 return(-1); 1955 } 1956 1957 /* 1958 * Grab sector info 1959 */ 1960 if (*rp++ != FDMFMID) 1961 continue; 1962 rp = msblkdecode(rp, tb, 4); 1963 #ifdef FDDEBUG 1964 printf("sector id: sector %d, track %d, side %d," 1965 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 1966 #endif 1967 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 1968 tb[2] > sc->nsectors) 1969 continue; 1970 1971 sec = tb[2]; 1972 sc->bytespersec = 128 << tb[3]; 1973 rp += 2; /* skip CRC-16 */ 1974 1975 /* 1976 * skip gap and read in data 1977 */ 1978 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 1979 return(-1); 1980 if (*rp++ != FDMFMDATA) 1981 continue; 1982 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 1983 sc->bytespersec); 1984 rp += 2; /* skip CRC-16 */ 1985 1986 retry = 0; 1987 } while (retry); 1988 } 1989 return(0); 1990 } 1991 1992 /* 1993 * encode len longwords of `dp' data in amiga mfm block format (`rp') 1994 * this format specified that the odd bits are at current pos and even 1995 * bits at len + current pos 1996 */ 1997 u_long * 1998 mfmblkencode(u_long *dp, u_long *rp, u_long *cp, int len) 1999 { 2000 u_long *sdp, *edp, d, dtmp, correct; 2001 2002 sdp = dp; 2003 edp = dp + len; 2004 2005 if (*(rp - 1) & 0x1) 2006 correct = 1; 2007 else 2008 correct = 0; 2009 /* 2010 * do odd bits 2011 */ 2012 while (dp < edp) { 2013 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2014 dtmp = d ^ 0x55555555; 2015 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2016 /* 2017 * correct upper clock bit if needed 2018 */ 2019 if (correct) 2020 d &= 0x7fffffff; 2021 if (d & 0x1) 2022 correct = 1; 2023 else 2024 correct = 0; 2025 /* 2026 * do checksums and store in raw buffer 2027 */ 2028 if (cp) 2029 *cp ^= d; 2030 *rp++ = d; 2031 dp++; 2032 } 2033 /* 2034 * do even bits 2035 */ 2036 dp = sdp; 2037 while (dp < edp) { 2038 d = *dp & 0x55555555; /* remove clock bits */ 2039 dtmp = d ^ 0x55555555; 2040 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2041 /* 2042 * correct upper clock bit if needed 2043 */ 2044 if (correct) 2045 d &= 0x7fffffff; 2046 if (d & 0x1) 2047 correct = 1; 2048 else 2049 correct = 0; 2050 /* 2051 * do checksums and store in raw buffer 2052 */ 2053 if (cp) 2054 *cp ^= d; 2055 *rp++ = d; 2056 dp++; 2057 } 2058 if (cp) 2059 *cp &= 0x55555555; 2060 return(rp); 2061 } 2062 2063 /* 2064 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2065 * this format specified that the odd bits are at current pos and even 2066 * bits at len + current pos 2067 */ 2068 u_long * 2069 mfmblkdecode(u_long *rp, u_long *dp, u_long *cp, int len) 2070 { 2071 u_long o, e; 2072 int cnt; 2073 2074 cnt = len; 2075 while (cnt--) { 2076 o = *rp; 2077 e = *(rp + len); 2078 if (cp) { 2079 *cp ^= o; 2080 *cp ^= e; 2081 } 2082 o &= 0x55555555; 2083 e &= 0x55555555; 2084 *dp++ = (o << 1) | e; 2085 rp++; 2086 } 2087 if (cp) 2088 *cp &= 0x55555555; 2089 return(rp + len); 2090 } 2091 2092 /* 2093 * decode len words in standard MFM format to len bytes 2094 * of data. 2095 */ 2096 u_short * 2097 msblkdecode(u_short *rp, u_char *cp, int len) 2098 { 2099 while (len--) { 2100 *cp++ = msdecode[*rp & 0x7f] | 2101 (msdecode[(*rp >> 8) & 0x7f] << 4); 2102 rp++; 2103 } 2104 2105 return(rp); 2106 } 2107 2108 /* 2109 * encode len bytes of data into len words in standard MFM format. 2110 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2111 * as well. 2112 */ 2113 u_short * 2114 msblkencode(u_short *rp, u_char *cp, int len, u_short *crc) 2115 { 2116 u_short td; 2117 u_short mycrc; 2118 2119 /* preload crc for header (4 bytes) 2120 * or data (anything else) 2121 */ 2122 mycrc = (len == 4) ? 0xb230 : 0xe295; 2123 2124 while (len--) { 2125 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2126 2127 /* Check for zeros in top bit of encode and bottom 2128 * bit of previous encode. if so, slap a one in betweem 2129 * them. 2130 */ 2131 if ((td & 0x140) == 0) 2132 td |= 0x80; 2133 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2134 td |= 0x8000; 2135 2136 *rp++ = td; 2137 2138 /* 2139 * calc crc if requested 2140 */ 2141 if (crc) 2142 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2143 2144 cp++; 2145 } 2146 2147 if (crc) 2148 *crc = mycrc; 2149 2150 return(rp); 2151 } 2152 2153 int 2154 fddump(dev_t dev, daddr_t blkno, caddr_t va, size_t size) 2155 { 2156 return (EINVAL); 2157 } 2158
Indexes created Thu Oct 02 14:10:14 GMT 2025