fd.c revision 1.47.2.2
1 /* $NetBSD: fd.c,v 1.47.2.2 2001/10/10 11:55:49 fvdl 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 <sys/vnode.h> 48 #include <machine/cpu.h> 49 #include <amiga/amiga/device.h> 50 #include <amiga/amiga/custom.h> 51 #include <amiga/amiga/cia.h> 52 #include <amiga/amiga/cc.h> 53 54 #include <sys/conf.h> 55 #include <machine/conf.h> 56 57 #include "locators.h" 58 59 enum fdc_bits { FDB_CHANGED = 2, FDB_PROTECT, FDB_CYLZERO, FDB_READY }; 60 /* 61 * partitions in fd represent different format floppies 62 * partition a is 0 etc.. 63 */ 64 enum fd_parttypes { 65 FDAMIGAPART = 0, 66 FDMSDOSPART, 67 FDMAXPARTS 68 }; 69 70 #define FDBBSIZE (8192) 71 #define FDSBSIZE (8192) 72 73 #define FDUNIT(dev) DISKUNIT(dev) 74 #define FDPART(dev) DISKPART(dev) 75 #define FDMAKEDEV(m, u, p) MAKEDISKDEV((m), (u), (p)) 76 77 /* that's nice, but we don't want to always use this as an amiga drive 78 bunghole :-) */ 79 #define FDNHEADS (2) /* amiga drives always have 2 heads */ 80 #define FDSECSIZE (512) /* amiga drives always have 512 byte sectors */ 81 #define FDSECLWORDS (128) 82 83 #define FDSETTLEDELAY (18000) /* usec delay after seeking after switch dir */ 84 #define FDSTEPDELAY (3500) /* usec delay after steping */ 85 #define FDPRESIDEDELAY (1000) /* usec delay before writing can occur */ 86 #define FDWRITEDELAY (1300) /* usec delay after write */ 87 88 #define FDSTEPOUT (1) /* decrease track step */ 89 #define FDSTEPIN (0) /* increase track step */ 90 91 #define FDCUNITMASK (0x78) /* mask for all units (bits 6-3) */ 92 93 #define FDRETRIES (2) /* default number of retries */ 94 #define FDMAXUNITS (4) /* maximum number of supported units */ 95 96 #define DISKLEN_READ (0) /* fake mask for reading */ 97 #define DISKLEN_WRITE (1 << 14) /* bit for writing */ 98 #define DISKLEN_DMAEN (1 << 15) /* dma go */ 99 #define DMABUFSZ ((DISKLEN_WRITE - 1) * 2) /* largest dma possible */ 100 101 #define FDMFMSYNC (0x4489) 102 #define FDMFMID (0x5554) 103 #define FDMFMDATA (0x5545) 104 #define FDMFMGAP1 (0x9254) 105 #define FDMFMGAP2 (0xAAAA) 106 #define FDMFMGAP3 (0x9254) 107 #define CRC16POLY (0x1021) /* (x^16) + x^12 + x^5 + x^0 */ 108 109 /* 110 * Msdos-type MFM encode/decode 111 */ 112 static u_char msdecode[128]; 113 static u_char msencode[16] = 114 { 115 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, 116 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 117 }; 118 static u_short mscrctab[256]; 119 120 /* 121 5554 aaaa aaaa aaa5 2aa4 4452 aa51 122 00 00 03 02 ac 0d 123 */ 124 125 /* 126 * floppy device type 127 */ 128 struct fdtype { 129 u_int driveid; /* drive identification (from drive) */ 130 u_int ncylinders; /* number of cylinders on drive */ 131 u_int amiga_nsectors; /* number of sectors per amiga track */ 132 u_int msdos_nsectors; /* number of sectors per msdos track */ 133 u_int nreadw; /* number of words (short) read per track */ 134 u_int nwritew; /* number of words (short) written per track */ 135 u_int gap; /* track gap size in long words */ 136 u_int precomp[2]; /* 1st and 2nd precomp values */ 137 char *desc; /* description of drive type (useq) */ 138 }; 139 140 /* 141 * floppy disk device data 142 */ 143 struct fd_softc { 144 struct device sc_dv; /* generic device info; must come first */ 145 struct disk dkdev; /* generic disk info */ 146 struct buf_queue bufq; /* queue pending I/O operations */ 147 struct buf curbuf; /* state of current I/O operation */ 148 struct callout calibrate_ch; 149 struct callout motor_ch; 150 struct fdtype *type; 151 void *cachep; /* cached track data (write through) */ 152 int cachetrk; /* cahced track -1 for none */ 153 int hwunit; /* unit for amiga controlling hw */ 154 int unitmask; /* mask for cia select deslect */ 155 int pstepdir; /* previous step direction */ 156 int curcyl; /* current curcyl head positioned on */ 157 int flags; /* misc flags */ 158 int wlabel; 159 int stepdelay; /* useq to delay after seek user setable */ 160 int nsectors; /* number of sectors per track */ 161 int openpart; /* which partition [ab] == [12] is open */ 162 short retries; /* number of times to retry failed io */ 163 short retried; /* number of times current io retried */ 164 int bytespersec; /* number of bytes per sector */ 165 }; 166 167 /* fd_softc->flags */ 168 #define FDF_MOTORON (0x01) /* motor is running */ 169 #define FDF_MOTOROFF (0x02) /* motor is waiting to be turned off */ 170 #define FDF_WMOTOROFF (0x04) /* unit wants a wakeup after off */ 171 #define FDF_DIRTY (0x08) /* track cache needs write */ 172 #define FDF_WRITEWAIT (0x10) /* need to head select delay on next setpos */ 173 #define FDF_HAVELABEL (0x20) /* label is valid */ 174 #define FDF_JUSTFLUSH (0x40) /* don't bother caching track. */ 175 #define FDF_NOTRACK0 (0x80) /* was not able to recalibrate drive */ 176 177 int fdc_wantwakeup; 178 int fdc_side; 179 void *fdc_dmap; 180 struct fd_softc *fdc_indma; 181 int fdc_dmalen; 182 int fdc_dmawrite; 183 184 struct fdcargs { 185 struct fdtype *type; 186 int unit; 187 }; 188 189 int fdcmatch __P((struct device *, struct cfdata *, void *)); 190 void fdcattach __P((struct device *, struct device *, void *)); 191 int fdcprint __P((void *, const char *)); 192 int fdmatch __P((struct device *, struct cfdata *, void *)); 193 void fdattach __P((struct device *, struct device *, void *)); 194 195 void fdintr __P((int)); 196 void fdidxintr __P((void)); 197 void fdstrategy __P((struct buf *)); 198 int fdloaddisk __P((struct fd_softc *)); 199 void fdgetdefaultlabel __P((struct fd_softc *, struct disklabel *, int)); 200 int fdgetdisklabel __P((struct fd_softc *, struct vnode *)); 201 int fdsetdisklabel __P((struct fd_softc *, struct disklabel *)); 202 int fdputdisklabel __P((struct fd_softc *, struct vnode *)); 203 struct fdtype * fdcgetfdtype __P((int)); 204 void fdmotoroff __P((void *)); 205 void fdsetpos __P((struct fd_softc *, int, int)); 206 void fdselunit __P((struct fd_softc *)); 207 void fdstart __P((struct fd_softc *)); 208 void fdcont __P((struct fd_softc *)); 209 void fddmastart __P((struct fd_softc *, int)); 210 void fdcalibrate __P((void *)); 211 void fddmadone __P((struct fd_softc *, int)); 212 void fddone __P((struct fd_softc *)); 213 void fdfindwork __P((int)); 214 void fdminphys __P((struct buf *)); 215 void fdcachetoraw __P((struct fd_softc *)); 216 void amcachetoraw __P((struct fd_softc *)); 217 int amrawtocache __P((struct fd_softc *)); 218 u_long *fdfindsync __P((u_long *, u_long *)); 219 int fdrawtocache __P((struct fd_softc *)); 220 void mscachetoraw __P((struct fd_softc *)); 221 int msrawtocache __P((struct fd_softc *)); 222 u_long *mfmblkencode __P((u_long *, u_long *, u_long *, int)); 223 u_long *mfmblkdecode __P((u_long *, u_long *, u_long *, int)); 224 u_short *msblkdecode __P((u_short *, u_char *, int)); 225 u_short *msblkencode __P((u_short *, u_char *, int, u_short *)); 226 227 struct dkdriver fddkdriver = { fdstrategy }; 228 229 /* 230 * read size is (nsectors + 1) * mfm secsize + gap bytes + 2 shorts 231 * write size is nsectors * mfm secsize + gap bytes + 3 shorts 232 * the extra shorts are to deal with a dma hw bug in the controller 233 * they are probably too much (I belive the bug is 1 short on write and 234 * 3 bits on read) but there is no need to be cheap here. 235 */ 236 #define MAXTRKSZ (22 * FDSECSIZE) 237 struct fdtype fdtype[] = { 238 { 0x00000000, 80, 11, 9, 7358, 6815, 414, { 80, 161 }, "3.5dd" }, 239 { 0x55555555, 40, 11, 9, 7358, 6815, 414, { 80, 161 }, "5.25dd" }, 240 { 0xAAAAAAAA, 80, 22, 18, 14716, 13630, 828, { 80, 161 }, "3.5hd" } 241 }; 242 int nfdtype = sizeof(fdtype) / sizeof(*fdtype); 243 244 struct cfattach fd_ca = { 245 sizeof(struct fd_softc), fdmatch, fdattach 246 }; 247 248 extern struct cfdriver fd_cd; 249 250 struct cfattach fdc_ca = { 251 sizeof(struct device), fdcmatch, fdcattach 252 }; 253 254 /* 255 * all hw access through macros, this helps to hide the active low 256 * properties 257 */ 258 259 #define FDUNITMASK(unit) (1 << (3 + (unit))) 260 261 /* 262 * select units using mask 263 */ 264 #define FDSELECT(um) do { ciab.prb &= ~(um); } while (0) 265 266 /* 267 * deselect units using mask 268 */ 269 #define FDDESELECT(um) do { ciab.prb |= (um); delay(1); } while (0) 270 271 /* 272 * test hw condition bits 273 */ 274 #define FDTESTC(bit) ((ciaa.pra & (1 << (bit))) == 0) 275 276 /* 277 * set motor for select units, true motor on else off 278 */ 279 #define FDSETMOTOR(on) do { \ 280 if (on) ciab.prb &= ~CIAB_PRB_MTR; else ciab.prb |= CIAB_PRB_MTR; \ 281 } while (0) 282 283 /* 284 * set head for select units 285 */ 286 #define FDSETHEAD(head) do { \ 287 if (head) ciab.prb &= ~CIAB_PRB_SIDE; else ciab.prb |= CIAB_PRB_SIDE; \ 288 delay(1); } while (0) 289 290 /* 291 * select direction, true towards spindle else outwards 292 */ 293 #define FDSETDIR(in) do { \ 294 if (in) ciab.prb &= ~CIAB_PRB_DIR; else ciab.prb |= CIAB_PRB_DIR; \ 295 delay(1); } while (0) 296 297 /* 298 * step the selected units 299 */ 300 #define FDSTEP do { \ 301 ciab.prb &= ~CIAB_PRB_STEP; ciab.prb |= CIAB_PRB_STEP; \ 302 } while (0) 303 304 #define FDDMASTART(len, towrite) do { \ 305 int dmasz = (len) | ((towrite) ? DISKLEN_WRITE : 0) | DISKLEN_DMAEN; \ 306 custom.dsklen = dmasz; custom.dsklen = dmasz; } while (0) 307 308 #define FDDMASTOP do { custom.dsklen = 0; } while (0) 309 310 311 int 312 fdcmatch(pdp, cfp, auxp) 313 struct device *pdp; 314 struct cfdata *cfp; 315 void *auxp; 316 { 317 static int fdc_matched = 0; 318 319 /* Allow only once instance. */ 320 if (matchname("fdc", auxp) == 0 || fdc_matched) 321 return(0); 322 if ((fdc_dmap = alloc_chipmem(DMABUFSZ)) == NULL) { 323 printf("fdc: unable to allocate dma buffer\n"); 324 return(0); 325 } 326 327 fdc_matched = 1; 328 return(1); 329 } 330 331 void 332 fdcattach(pdp, dp, auxp) 333 struct device *pdp, *dp; 334 void *auxp; 335 { 336 struct fdcargs args; 337 338 printf(": dmabuf pa 0x%x", kvtop(fdc_dmap)); 339 printf(": dmabuf ka %p\n", fdc_dmap); 340 args.unit = 0; 341 args.type = fdcgetfdtype(args.unit); 342 343 fdc_side = -1; 344 config_found(dp, &args, fdcprint); 345 for (args.unit++; args.unit < FDMAXUNITS; args.unit++) { 346 if ((args.type = fdcgetfdtype(args.unit)) == NULL) 347 continue; 348 config_found(dp, &args, fdcprint); 349 } 350 } 351 352 int 353 fdcprint(auxp, pnp) 354 void *auxp; 355 const char *pnp; 356 { 357 struct fdcargs *fcp; 358 359 fcp = auxp; 360 if (pnp) 361 printf("fd%d at %s unit %d:", fcp->unit, pnp, 362 fcp->type->driveid); 363 return(UNCONF); 364 } 365 366 /*ARGSUSED*/ 367 int 368 fdmatch(pdp, cfp, auxp) 369 struct device *pdp; 370 struct cfdata *cfp; 371 void *auxp; 372 { 373 struct fdcargs *fdap; 374 375 fdap = auxp; 376 if (cfp->cf_loc[FDCCF_UNIT] == fdap->unit || 377 cfp->cf_loc[FDCCF_UNIT] == FDCCF_UNIT_DEFAULT) 378 return(1); 379 380 return(0); 381 } 382 383 void 384 fdattach(pdp, dp, auxp) 385 struct device *pdp, *dp; 386 void *auxp; 387 { 388 struct fdcargs *ap; 389 struct fd_softc *sc; 390 int i; 391 392 ap = auxp; 393 sc = (struct fd_softc *)dp; 394 395 BUFQ_INIT(&sc->bufq); 396 callout_init(&sc->calibrate_ch); 397 callout_init(&sc->motor_ch); 398 399 sc->curcyl = sc->cachetrk = -1; 400 sc->openpart = -1; 401 sc->type = ap->type; 402 sc->hwunit = ap->unit; 403 sc->unitmask = 1 << (3 + ap->unit); 404 sc->retries = FDRETRIES; 405 sc->stepdelay = FDSTEPDELAY; 406 sc->bytespersec = 512; 407 printf(" unit %d: %s %d cyl, %d head, %d sec [%d sec], 512 bytes/sec\n", 408 sc->hwunit, sc->type->desc, sc->type->ncylinders, FDNHEADS, 409 sc->type->amiga_nsectors, sc->type->msdos_nsectors); 410 411 /* 412 * Initialize and attach the disk structure. 413 */ 414 sc->dkdev.dk_name = sc->sc_dv.dv_xname; 415 sc->dkdev.dk_driver = &fddkdriver; 416 disk_attach(&sc->dkdev); 417 418 /* 419 * calibrate the drive 420 */ 421 fdsetpos(sc, 0, 0); 422 fdsetpos(sc, sc->type->ncylinders, 0); 423 fdsetpos(sc, 0, 0); 424 fdmotoroff(sc); 425 426 /* 427 * precalc msdos MFM and CRC 428 */ 429 for (i = 0; i < 128; i++) 430 msdecode[i] = 0xff; 431 for (i = 0; i < 16; i++) 432 msdecode[msencode[i]] = i; 433 for (i = 0; i < 256; i++) { 434 mscrctab[i] = (0x1021 * (i & 0xf0)) ^ (0x1021 * (i & 0x0f)) ^ 435 (0x1021 * (i >> 4)); 436 } 437 438 /* 439 * enable disk related interrupts 440 */ 441 custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_DISK; 442 custom.intena = INTF_SETCLR | INTF_DSKBLK; 443 ciab.icr = CIA_ICR_FLG; 444 } 445 446 /*ARGSUSED*/ 447 int 448 fdopen(devvp, flags, devtype, p) 449 struct vnode *devvp; 450 int flags, devtype; 451 struct proc *p; 452 { 453 struct fd_softc *sc; 454 int wasopen, fwork, error, s; 455 dev_t dev; 456 457 error = 0; 458 459 dev = vdev_rdev(devvp); 460 if (FDPART(dev) >= FDMAXPARTS) 461 return(ENXIO); 462 463 if ((sc = getsoftc(fd_cd, FDUNIT(dev))) == NULL) 464 return(ENXIO); 465 if (sc->flags & FDF_NOTRACK0) 466 return(ENXIO); 467 if (sc->cachep == NULL) 468 sc->cachep = malloc(MAXTRKSZ, M_DEVBUF, M_WAITOK); 469 470 s = splbio(); 471 /* 472 * if we are sleeping in fdclose(); waiting for a chance to 473 * shut the motor off, do a sleep here also. 474 */ 475 while (sc->flags & FDF_WMOTOROFF) 476 tsleep(fdmotoroff, PRIBIO, "fdopen", 0); 477 478 fwork = 0; 479 /* 480 * if not open let user open request type, otherwise 481 * ensure they are trying to open same type. 482 */ 483 if (sc->openpart == FDPART(dev)) 484 wasopen = 1; 485 else if (sc->openpart == -1) { 486 sc->openpart = FDPART(dev); 487 wasopen = 0; 488 } else { 489 wasopen = 1; 490 error = EPERM; 491 goto done; 492 } 493 494 /* 495 * wait for current io to complete if any 496 */ 497 if (fdc_indma) { 498 fwork = 1; 499 fdc_wantwakeup++; 500 tsleep(fdopen, PRIBIO, "fdopen", 0); 501 } 502 if ((error = fdloaddisk(sc)) != 0) 503 goto done; 504 if ((error = fdgetdisklabel(sc, devvp)) != 0) 505 goto done; 506 #ifdef FDDEBUG 507 printf(" open successful\n"); 508 #endif 509 done: 510 /* 511 * if we requested that fddone()->fdfindwork() wake us, allow it to 512 * complete its job now 513 */ 514 if (fwork) 515 fdfindwork(FDUNIT(vdev_rdev(devvp))); 516 splx(s); 517 518 vdev_setprivdata(devvp, sc); 519 520 /* 521 * if we were not open and we marked us so reverse that. 522 */ 523 if (error && wasopen == 0) 524 sc->openpart = -1; 525 return(error); 526 } 527 528 /*ARGSUSED*/ 529 int 530 fdclose(devvp, flags, devtype, p) 531 struct vnode *devvp; 532 int flags, devtype; 533 struct proc *p; 534 { 535 struct fd_softc *sc; 536 int s; 537 538 #ifdef FDDEBUG 539 printf("fdclose()\n"); 540 #endif 541 sc = vdev_privdata(devvp); 542 543 s = splbio(); 544 if (sc->flags & FDF_MOTORON) { 545 sc->flags |= FDF_WMOTOROFF; 546 tsleep(fdmotoroff, PRIBIO, "fdclose", 0); 547 sc->flags &= ~FDF_WMOTOROFF; 548 wakeup(fdmotoroff); 549 } 550 sc->openpart = -1; 551 splx(s); 552 return(0); 553 } 554 555 int 556 fdioctl(devvp, cmd, addr, flag, p) 557 struct vnode *devvp; 558 u_long cmd; 559 caddr_t addr; 560 int flag; 561 struct proc *p; 562 { 563 struct fd_softc *sc; 564 int error, wlab; 565 dev_t dev; 566 567 sc = vdev_privdata(devvp); 568 dev = vdev_rdev(devvp); 569 570 if ((sc->flags & FDF_HAVELABEL) == 0) 571 return(EBADF); 572 573 switch (cmd) { 574 case DIOCSBAD: 575 return(EINVAL); 576 case DIOCSRETRIES: 577 if (*(int *)addr < 0) 578 return(EINVAL); 579 sc->retries = *(int *)addr; 580 return(0); 581 case DIOCSSTEP: 582 if (*(int *)addr < FDSTEPDELAY) 583 return(EINVAL); 584 sc->dkdev.dk_label->d_trkseek = sc->stepdelay = *(int *)addr; 585 return(0); 586 case DIOCGDINFO: 587 *(struct disklabel *)addr = *(sc->dkdev.dk_label); 588 return(0); 589 case DIOCGPART: 590 ((struct partinfo *)addr)->disklab = sc->dkdev.dk_label; 591 ((struct partinfo *)addr)->part = 592 &sc->dkdev.dk_label->d_partitions[FDPART(dev)]; 593 return(0); 594 case DIOCSDINFO: 595 if ((flag & FWRITE) == 0) 596 return(EBADF); 597 return(fdsetdisklabel(sc, (struct disklabel *)addr)); 598 case DIOCWDINFO: 599 if ((flag & FWRITE) == 0) 600 return(EBADF); 601 if ((error = fdsetdisklabel(sc, (struct disklabel *)addr)) != 0) 602 return(error); 603 wlab = sc->wlabel; 604 sc->wlabel = 1; 605 error = fdputdisklabel(sc, devvp); 606 sc->wlabel = wlab; 607 return(error); 608 case DIOCWLABEL: 609 if ((flag & FWRITE) == 0) 610 return(EBADF); 611 sc->wlabel = *(int *)addr; 612 return(0); 613 case DIOCGDEFLABEL: 614 fdgetdefaultlabel(sc, (struct disklabel *)addr, FDPART(dev)); 615 return(0); 616 default: 617 return(ENOTTY); 618 } 619 } 620 621 /* 622 * no dumps to floppy disks thank you. 623 */ 624 int 625 fdsize(dev) 626 dev_t dev; 627 { 628 return(-1); 629 } 630 631 int 632 fdread(devvp, uio, flags) 633 struct vnode *devvp; 634 struct uio *uio; 635 int flags; 636 { 637 return (physio(fdstrategy, NULL, devvp, B_READ, fdminphys, uio)); 638 } 639 640 int 641 fdwrite(devvp, uio, flags) 642 struct vnode *devvp; 643 struct uio *uio; 644 int flags; 645 { 646 return (physio(fdstrategy, NULL, devvp, B_WRITE, fdminphys, uio)); 647 } 648 649 650 void 651 fdintr(flag) 652 int flag; 653 { 654 int s; 655 656 s = splbio(); 657 if (fdc_indma) 658 fddmadone(fdc_indma, 0); 659 splx(s); 660 } 661 662 void 663 fdidxintr() 664 { 665 if (fdc_indma && fdc_dmalen) { 666 /* 667 * turn off intr and start actual dma 668 */ 669 ciab.icr = CIA_ICR_FLG; 670 FDDMASTART(fdc_dmalen, fdc_dmawrite); 671 fdc_dmalen = 0; 672 } 673 } 674 675 void 676 fdstrategy(bp) 677 struct buf *bp; 678 { 679 struct disklabel *lp; 680 struct fd_softc *sc; 681 int unit, part, s; 682 dev_t dev; 683 684 dev = vdev_rdev(bp->b_devvp); 685 unit = FDUNIT(dev); 686 part = FDPART(dev); 687 688 sc = vdev_privdata(bp->b_devvp); 689 690 #ifdef FDDEBUG 691 printf("fdstrategy: 0x%x\n", bp); 692 #endif 693 /* 694 * check for valid partition and bounds 695 */ 696 lp = sc->dkdev.dk_label; 697 if ((sc->flags & FDF_HAVELABEL) == 0) { 698 bp->b_error = EIO; 699 goto bad; 700 } 701 if (bounds_check_with_label(bp, lp, sc->wlabel) <= 0) 702 goto done; 703 704 /* 705 * trans count of zero or bounds check indicates io is done 706 * we are done. 707 */ 708 if (bp->b_bcount == 0) 709 goto done; 710 711 bp->b_rawblkno = bp->b_blkno; 712 713 /* 714 * queue the buf and kick the low level code 715 */ 716 s = splbio(); 717 disksort_cylinder(&sc->bufq, bp); 718 fdstart(sc); 719 splx(s); 720 return; 721 bad: 722 bp->b_flags |= B_ERROR; 723 done: 724 bp->b_resid = bp->b_bcount; 725 biodone(bp); 726 } 727 728 /* 729 * make sure disk is loaded and label is up-to-date. 730 */ 731 int 732 fdloaddisk(sc) 733 struct fd_softc *sc; 734 { 735 /* 736 * if diskchange is low step drive to 0 then up one then to zero. 737 */ 738 fdselunit(sc); /* make sure the unit is selected */ 739 if (FDTESTC(FDB_CHANGED)) { 740 fdsetpos(sc, 0, 0); 741 sc->cachetrk = -1; /* invalidate the cache */ 742 sc->flags &= ~FDF_HAVELABEL; 743 fdsetpos(sc, FDNHEADS, 0); 744 fdsetpos(sc, 0, 0); 745 if (FDTESTC(FDB_CHANGED)) { 746 fdmotoroff(sc); 747 FDDESELECT(sc->unitmask); 748 return(ENXIO); 749 } 750 } 751 FDDESELECT(sc->unitmask); 752 fdmotoroff(sc); 753 sc->type = fdcgetfdtype(sc->hwunit); 754 if (sc->type == NULL) 755 return(ENXIO); 756 if (sc->openpart == FDMSDOSPART) 757 sc->nsectors = sc->type->msdos_nsectors; 758 else 759 sc->nsectors = sc->type->amiga_nsectors; 760 return(0); 761 } 762 763 void 764 fdgetdefaultlabel(sc, lp, part) 765 struct fd_softc *sc; 766 struct disklabel *lp; 767 int part; /* XXX ick */ 768 { 769 770 bzero(lp, sizeof(struct disklabel)); 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_type = DTYPE_FLOPPY; 777 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 778 lp->d_rpm = 300; /* good guess I suppose. */ 779 lp->d_interleave = 1; /* should change when adding msdos */ 780 sc->stepdelay = lp->d_trkseek = FDSTEPDELAY; 781 lp->d_bbsize = 0; 782 lp->d_sbsize = 0; 783 lp->d_partitions[part].p_size = lp->d_secperunit; 784 lp->d_partitions[part].p_fstype = FS_UNUSED; 785 lp->d_partitions[part].p_fsize = 1024; 786 lp->d_partitions[part].p_frag = 8; 787 lp->d_partitions[part].p_cpg = 2; /* adosfs: reserved blocks */ 788 lp->d_npartitions = part + 1; 789 lp->d_magic = lp->d_magic2 = DISKMAGIC; 790 lp->d_checksum = dkcksum(lp); 791 } 792 793 /* 794 * read disk label, if present otherwise create one 795 * return a new label if raw part and none found, otherwise err. 796 */ 797 int 798 fdgetdisklabel(sc, devvp) 799 struct fd_softc *sc; 800 struct vnode *devvp; 801 { 802 struct disklabel *lp, *dlp; 803 struct cpu_disklabel *clp; 804 struct buf *bp; 805 int error, part; 806 dev_t dev; 807 808 dev = vdev_rdev(devvp); 809 if (sc->flags & FDF_HAVELABEL && 810 sc->dkdev.dk_label->d_npartitions == (FDPART(dev) + 1)) 811 return(0); 812 #ifdef FDDEBUG 813 printf("fdgetdisklabel()\n"); 814 #endif 815 part = FDPART(dev); 816 lp = sc->dkdev.dk_label; 817 clp = sc->dkdev.dk_cpulabel; 818 bzero(lp, sizeof(struct disklabel)); 819 bzero(clp, sizeof(struct cpu_disklabel)); 820 821 lp->d_secsize = FDSECSIZE; 822 lp->d_ntracks = FDNHEADS; 823 lp->d_ncylinders = sc->type->ncylinders; 824 lp->d_nsectors = sc->nsectors; 825 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 826 lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders; 827 lp->d_npartitions = part + 1; 828 lp->d_partitions[part].p_size = lp->d_secperunit; 829 lp->d_partitions[part].p_fstype = FS_UNUSED; 830 lp->d_partitions[part].p_fsize = 1024; 831 lp->d_partitions[part].p_frag = 8; 832 lp->d_partitions[part].p_cpg = 2; /* for adosfs: reserved blks */ 833 834 sc->flags |= FDF_HAVELABEL; 835 836 bp = (void *)geteblk((int)lp->d_secsize); 837 bp->b_devvp = devvp; 838 bp->b_blkno = 0; 839 bp->b_cylinder = 0; 840 bp->b_bcount = FDSECSIZE; 841 bp->b_flags |= B_READ; 842 fdstrategy(bp); 843 if ((error = biowait(bp)) != 0) 844 goto nolabel; 845 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 846 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC || 847 dkcksum(dlp)) { 848 error = EINVAL; 849 goto nolabel; 850 } 851 bcopy(dlp, lp, sizeof(struct disklabel)); 852 if (lp->d_trkseek > FDSTEPDELAY) 853 sc->stepdelay = lp->d_trkseek; 854 brelse(bp); 855 return(0); 856 nolabel: 857 fdgetdefaultlabel(sc, lp, part); 858 brelse(bp); 859 return(0); 860 } 861 862 /* 863 * set the incore copy of this units disklabel 864 */ 865 int 866 fdsetdisklabel(sc, lp) 867 struct fd_softc *sc; 868 struct disklabel *lp; 869 { 870 struct disklabel *clp; 871 struct partition *pp; 872 873 /* 874 * must have at least opened raw unit to fetch the 875 * raw_part stuff. 876 */ 877 if ((sc->flags & FDF_HAVELABEL) == 0) 878 return(EINVAL); 879 clp = sc->dkdev.dk_label; 880 /* 881 * make sure things check out and we only have one valid 882 * partition 883 */ 884 #ifdef FDDEBUG 885 printf("fdsetdisklabel\n"); 886 #endif 887 if (lp->d_secsize != FDSECSIZE || 888 lp->d_nsectors != clp->d_nsectors || 889 lp->d_ntracks != FDNHEADS || 890 lp->d_ncylinders != clp->d_ncylinders || 891 lp->d_secpercyl != clp->d_secpercyl || 892 lp->d_secperunit != clp->d_secperunit || 893 lp->d_magic != DISKMAGIC || 894 lp->d_magic2 != DISKMAGIC || 895 lp->d_npartitions == 0 || 896 lp->d_npartitions > FDMAXPARTS || 897 (lp->d_partitions[0].p_offset && lp->d_partitions[1].p_offset) || 898 dkcksum(lp)) 899 return(EINVAL); 900 /* 901 * if any partitions are present make sure they 902 * represent the currently open type 903 */ 904 if ((pp = &lp->d_partitions[0])->p_size) { 905 if ((pp = &lp->d_partitions[1])->p_size == 0) 906 goto done; 907 else if (sc->openpart != 1) 908 return(EINVAL); 909 } else if (sc->openpart != 0) 910 return(EINVAL); 911 /* 912 * make sure selected partition is within bounds 913 * XXX on the second check, its to handle a bug in 914 * XXX the cluster routines as they require mutliples 915 * XXX of NBPG currently 916 */ 917 if ((pp->p_offset + pp->p_size >= lp->d_secperunit) || 918 (pp->p_frag * pp->p_fsize % NBPG)) 919 return(EINVAL); 920 done: 921 bcopy(lp, clp, sizeof(struct disklabel)); 922 return(0); 923 } 924 925 /* 926 * write out the incore copy of this units disklabel 927 */ 928 int 929 fdputdisklabel(sc, devvp) 930 struct fd_softc *sc; 931 struct vnode *devvp; 932 { 933 struct disklabel *lp, *dlp; 934 struct buf *bp; 935 int error; 936 937 if ((sc->flags & FDF_HAVELABEL) == 0) 938 return(EBADF); 939 #ifdef FDDEBUG 940 printf("fdputdisklabel\n"); 941 #endif 942 /* 943 * get buf and read in sector 0 944 */ 945 lp = sc->dkdev.dk_label; 946 bp = geteblk((int)lp->d_secsize); 947 bp->b_devvp = devvp; 948 bp->b_blkno = 0; 949 bp->b_cylinder = 0; 950 bp->b_bcount = FDSECSIZE; 951 bp->b_flags |= B_READ; 952 fdstrategy(bp); 953 if ((error = biowait(bp)) != 0) 954 goto done; 955 /* 956 * copy disklabel to buf and write it out syncronous 957 */ 958 dlp = (struct disklabel *)(bp->b_data + LABELOFFSET); 959 bcopy(lp, dlp, sizeof(struct disklabel)); 960 bp->b_blkno = 0; 961 bp->b_cylinder = 0; 962 bp->b_flags &= ~(B_READ|B_DONE); 963 bp->b_flags |= B_WRITE; 964 fdstrategy(bp); 965 error = biowait(bp); 966 done: 967 brelse(bp); 968 return(error); 969 } 970 971 /* 972 * figure out drive type or NULL if none. 973 */ 974 struct fdtype * 975 fdcgetfdtype(unit) 976 int unit; 977 { 978 struct fdtype *ftp; 979 u_long id, idb; 980 int cnt, umask; 981 982 id = 0; 983 umask = 1 << (3 + unit); 984 985 FDDESELECT(FDCUNITMASK); 986 987 FDSETMOTOR(1); 988 delay(1); 989 FDSELECT(umask); 990 delay(1); 991 FDDESELECT(umask); 992 993 FDSETMOTOR(0); 994 delay(1); 995 FDSELECT(umask); 996 delay(1); 997 FDDESELECT(umask); 998 999 for (idb = 0x80000000; idb; idb >>= 1) { 1000 FDSELECT(umask); 1001 delay(1); 1002 if (FDTESTC(FDB_READY) == 0) 1003 id |= idb; 1004 FDDESELECT(umask); 1005 delay(1); 1006 } 1007 #ifdef FDDEBUG 1008 printf("fdcgettype unit %d id 0x%lx\n", unit, id); 1009 #endif 1010 1011 for (cnt = 0, ftp = fdtype; cnt < nfdtype; ftp++, cnt++) 1012 if (ftp->driveid == id) 1013 return(ftp); 1014 /* 1015 * 3.5dd's at unit 0 do not always return id. 1016 */ 1017 if (unit == 0) 1018 return(fdtype); 1019 return(NULL); 1020 } 1021 1022 /* 1023 * turn motor off if possible otherwise mark as needed and will be done 1024 * later. 1025 */ 1026 void 1027 fdmotoroff(arg) 1028 void *arg; 1029 { 1030 struct fd_softc *sc; 1031 int s; 1032 1033 sc = arg; 1034 s = splbio(); 1035 1036 #ifdef FDDEBUG 1037 printf("fdmotoroff: unit %d\n", sc->hwunit); 1038 #endif 1039 if ((sc->flags & FDF_MOTORON) == 0) 1040 goto done; 1041 /* 1042 * if we have a timeout on a dma operation let fddmadone() 1043 * deal with it. 1044 */ 1045 if (fdc_indma == sc) { 1046 fddmadone(sc, 1); 1047 goto done; 1048 } 1049 #ifdef FDDEBUG 1050 printf(" motor was on, turning off\n"); 1051 #endif 1052 1053 /* 1054 * flush cache if needed 1055 */ 1056 if (sc->flags & FDF_DIRTY) { 1057 sc->flags |= FDF_JUSTFLUSH | FDF_MOTOROFF; 1058 #ifdef FDDEBUG 1059 printf(" flushing dirty buffer first\n"); 1060 #endif 1061 /* 1062 * if dma'ing done for now, fddone() will call us again 1063 */ 1064 if (fdc_indma) 1065 goto done; 1066 fddmastart(sc, sc->cachetrk); 1067 goto done; 1068 } 1069 1070 /* 1071 * if controller is busy just schedule us to be called back 1072 */ 1073 if (fdc_indma) { 1074 /* 1075 * someone else has the controller now 1076 * just set flag and let fddone() call us again. 1077 */ 1078 sc->flags |= FDF_MOTOROFF; 1079 goto done; 1080 } 1081 1082 #ifdef FDDEBUG 1083 printf(" hw turning unit off\n"); 1084 #endif 1085 1086 sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF); 1087 FDDESELECT(FDCUNITMASK); 1088 FDSETMOTOR(0); 1089 delay(1); 1090 FDSELECT(sc->unitmask); 1091 delay(4); 1092 FDDESELECT(sc->unitmask); 1093 delay(1); 1094 if (sc->flags & FDF_WMOTOROFF) 1095 wakeup(fdmotoroff); 1096 done: 1097 splx(s); 1098 } 1099 1100 /* 1101 * select drive seek to track exit with motor on. 1102 * fdsetpos(x, 0, 0) does calibrates the drive. 1103 */ 1104 void 1105 fdsetpos(sc, trk, towrite) 1106 struct fd_softc *sc; 1107 int trk, towrite; 1108 { 1109 int nstep, sdir, ondly, ncyl, nside; 1110 1111 FDDESELECT(FDCUNITMASK); 1112 FDSETMOTOR(1); 1113 delay(1); 1114 FDSELECT(sc->unitmask); 1115 delay(1); 1116 if ((sc->flags & FDF_MOTORON) == 0) { 1117 ondly = 0; 1118 while (FDTESTC(FDB_READY) == 0) { 1119 delay(1000); 1120 if (++ondly >= 1000) 1121 break; 1122 } 1123 } 1124 sc->flags |= FDF_MOTORON; 1125 1126 ncyl = trk / FDNHEADS; 1127 nside = trk % FDNHEADS; 1128 1129 if (sc->curcyl == ncyl && fdc_side == nside) 1130 return; 1131 1132 if (towrite) 1133 sc->flags |= FDF_WRITEWAIT; 1134 1135 #ifdef FDDEBUG 1136 printf("fdsetpos: cyl %d head %d towrite %d\n", trk / FDNHEADS, 1137 trk % FDNHEADS, towrite); 1138 #endif 1139 nstep = ncyl - sc->curcyl; 1140 if (nstep) { 1141 /* 1142 * figure direction 1143 */ 1144 if (nstep > 0 && ncyl != 0) { 1145 sdir = FDSTEPIN; 1146 FDSETDIR(1); 1147 } else { 1148 nstep = -nstep; 1149 sdir = FDSTEPOUT; 1150 FDSETDIR(0); 1151 } 1152 if (ncyl == 0) { 1153 /* 1154 * either just want cylinder 0 or doing 1155 * a calibrate. 1156 */ 1157 nstep = 256; 1158 while (FDTESTC(FDB_CYLZERO) == 0 && nstep--) { 1159 FDSTEP; 1160 delay(sc->stepdelay); 1161 } 1162 if (nstep < 0) 1163 sc->flags |= FDF_NOTRACK0; 1164 } else { 1165 /* 1166 * step the needed amount amount. 1167 */ 1168 while (nstep--) { 1169 FDSTEP; 1170 delay(sc->stepdelay); 1171 } 1172 } 1173 /* 1174 * if switched directions 1175 * allow drive to settle. 1176 */ 1177 if (sc->pstepdir != sdir) 1178 delay(FDSETTLEDELAY); 1179 sc->pstepdir = sdir; 1180 sc->curcyl = ncyl; 1181 } 1182 if (nside == fdc_side) 1183 return; 1184 /* 1185 * select side 1186 */ 1187 fdc_side = nside; 1188 FDSETHEAD(nside); 1189 delay(FDPRESIDEDELAY); 1190 } 1191 1192 void 1193 fdselunit(sc) 1194 struct fd_softc *sc; 1195 { 1196 FDDESELECT(FDCUNITMASK); /* deselect all */ 1197 FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */ 1198 delay(1); 1199 FDSELECT(sc->unitmask); /* select unit */ 1200 delay(1); 1201 } 1202 1203 /* 1204 * process next buf on device queue. 1205 * normall sequence of events: 1206 * fdstart() -> fddmastart(); 1207 * fdidxintr(); 1208 * fdintr() -> fddmadone() -> fddone(); 1209 * if the track is in the cache then fdstart() will short-circuit 1210 * to fddone() else if the track cache is dirty it will flush. If 1211 * the buf is not an entire track it will cache the requested track. 1212 */ 1213 void 1214 fdstart(sc) 1215 struct fd_softc *sc; 1216 { 1217 int trk, error, write; 1218 struct buf *bp, *dp; 1219 int changed; 1220 1221 #ifdef FDDEBUG 1222 printf("fdstart: unit %d\n", sc->hwunit); 1223 #endif 1224 1225 /* 1226 * if dma'ing just return. we must have been called from fdstartegy. 1227 */ 1228 if (fdc_indma) 1229 return; 1230 1231 /* 1232 * get next buf if there. 1233 */ 1234 dp = &sc->curbuf; 1235 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) { 1236 #ifdef FDDEBUG 1237 printf(" nothing to do\n"); 1238 #endif 1239 return; 1240 } 1241 1242 /* 1243 * Mark us as busy now, in case fddone() gets called in one 1244 * of the cases below. 1245 */ 1246 disk_busy(&sc->dkdev); 1247 1248 /* 1249 * make sure same disk is loaded 1250 */ 1251 fdselunit(sc); 1252 changed = FDTESTC(FDB_CHANGED); 1253 FDDESELECT(sc->unitmask); 1254 if (changed) { 1255 /* 1256 * disk missing, invalidate all future io on 1257 * this unit until re-open()'ed also invalidate 1258 * all current io 1259 */ 1260 printf("fdstart: disk changed\n"); 1261 #ifdef FDDEBUG 1262 printf(" disk was removed invalidating all io\n"); 1263 #endif 1264 sc->flags &= ~FDF_HAVELABEL; 1265 for (;;) { 1266 bp->b_flags |= B_ERROR; 1267 bp->b_error = EIO; 1268 if (BUFQ_NEXT(bp) == NULL) 1269 break; 1270 biodone(bp); 1271 bp = BUFQ_NEXT(bp); 1272 } 1273 /* 1274 * do fddone() on last buf to allow other units to start. 1275 */ 1276 BUFQ_INSERT_HEAD(&sc->bufq, bp); 1277 fddone(sc); 1278 return; 1279 } 1280 1281 /* 1282 * we have a valid buf, setup our local version 1283 * we use this count to allow reading over multiple tracks. 1284 * into a single buffer 1285 */ 1286 dp->b_bcount = bp->b_bcount; 1287 dp->b_blkno = bp->b_blkno; 1288 dp->b_data = bp->b_data; 1289 dp->b_flags = bp->b_flags; 1290 dp->b_resid = 0; 1291 1292 if (bp->b_flags & B_READ) 1293 write = 0; 1294 else if (FDTESTC(FDB_PROTECT) == 0) 1295 write = 1; 1296 else { 1297 error = EPERM; 1298 goto bad; 1299 } 1300 1301 /* 1302 * figure trk given blkno 1303 */ 1304 trk = bp->b_blkno / sc->nsectors; 1305 1306 /* 1307 * check to see if same as currently cached track 1308 * if so we need to do no dma read. 1309 */ 1310 if (trk == sc->cachetrk) { 1311 fddone(sc); 1312 return; 1313 } 1314 1315 /* 1316 * if we will be overwriting the entire cache, don't bother to 1317 * fetch it. 1318 */ 1319 if (bp->b_bcount == (sc->nsectors * FDSECSIZE) && write && 1320 bp->b_blkno % sc->nsectors == 0) { 1321 if (sc->flags & FDF_DIRTY) 1322 sc->flags |= FDF_JUSTFLUSH; 1323 else { 1324 sc->cachetrk = trk; 1325 fddone(sc); 1326 return; 1327 } 1328 } 1329 1330 /* 1331 * start dma read of `trk' 1332 */ 1333 fddmastart(sc, trk); 1334 return; 1335 bad: 1336 bp->b_flags |= B_ERROR; 1337 bp->b_error = error; 1338 fddone(sc); 1339 } 1340 1341 /* 1342 * continue a started operation on next track. always begin at 1343 * sector 0 on the next track. 1344 */ 1345 void 1346 fdcont(sc) 1347 struct fd_softc *sc; 1348 { 1349 struct buf *dp, *bp; 1350 int trk, write; 1351 1352 dp = &sc->curbuf; 1353 bp = BUFQ_FIRST(&sc->bufq); 1354 dp->b_data += (dp->b_bcount - bp->b_resid); 1355 dp->b_blkno += (dp->b_bcount - bp->b_resid) / FDSECSIZE; 1356 dp->b_bcount = bp->b_resid; 1357 1358 /* 1359 * figure trk given blkno 1360 */ 1361 trk = dp->b_blkno / sc->nsectors; 1362 #ifdef DEBUG 1363 if (trk != sc->cachetrk + 1 || dp->b_blkno % sc->nsectors != 0) 1364 panic("fdcont: confused"); 1365 #endif 1366 if (dp->b_flags & B_READ) 1367 write = 0; 1368 else 1369 write = 1; 1370 /* 1371 * if we will be overwriting the entire cache, don't bother to 1372 * fetch it. 1373 */ 1374 if (dp->b_bcount == (sc->nsectors * FDSECSIZE) && write) { 1375 if (sc->flags & FDF_DIRTY) 1376 sc->flags |= FDF_JUSTFLUSH; 1377 else { 1378 sc->cachetrk = trk; 1379 fddone(sc); 1380 return; 1381 } 1382 } 1383 /* 1384 * start dma read of `trk' 1385 */ 1386 fddmastart(sc, trk); 1387 return; 1388 } 1389 1390 void 1391 fddmastart(sc, trk) 1392 struct fd_softc *sc; 1393 int trk; 1394 { 1395 int adkmask, ndmaw, write, dmatrk; 1396 1397 #ifdef FDDEBUG 1398 printf("fddmastart: unit %d cyl %d head %d", sc->hwunit, 1399 trk / FDNHEADS, trk % FDNHEADS); 1400 #endif 1401 /* 1402 * flush the cached track if dirty else read requested track. 1403 */ 1404 if (sc->flags & FDF_DIRTY) { 1405 fdcachetoraw(sc); 1406 ndmaw = sc->type->nwritew; 1407 dmatrk = sc->cachetrk; 1408 write = 1; 1409 } else { 1410 ndmaw = sc->type->nreadw; 1411 dmatrk = trk; 1412 write = 0; 1413 } 1414 1415 #ifdef FDDEBUG 1416 printf(" %s", write ? " flushing cache\n" : " loading cache\n"); 1417 #endif 1418 sc->cachetrk = trk; 1419 fdc_indma = sc; 1420 fdsetpos(sc, dmatrk, write); 1421 1422 /* 1423 * setup dma stuff 1424 */ 1425 if (write == 0) { 1426 custom.adkcon = ADKF_MSBSYNC; 1427 custom.adkcon = ADKF_SETCLR | ADKF_WORDSYNC | ADKF_FAST; 1428 custom.dsksync = FDMFMSYNC; 1429 } else { 1430 custom.adkcon = ADKF_PRECOMP1 | ADKF_PRECOMP0 | ADKF_WORDSYNC | 1431 ADKF_MSBSYNC; 1432 adkmask = ADKF_SETCLR | ADKF_FAST | ADKF_MFMPREC; 1433 if (dmatrk >= sc->type->precomp[0]) 1434 adkmask |= ADKF_PRECOMP0; 1435 if (dmatrk >= sc->type->precomp[1]) 1436 adkmask |= ADKF_PRECOMP1; 1437 custom.adkcon = adkmask; 1438 } 1439 custom.dskpt = (u_char *)kvtop(fdc_dmap); 1440 1441 /* 1442 * If writing an MSDOS track, activate disk index pulse 1443 * interrupt, dma will be started in the intr routine fdidxintr() 1444 * Otherwise, start the DMA here. 1445 */ 1446 if (write && sc->openpart == FDMSDOSPART) { 1447 fdc_dmalen = ndmaw; 1448 fdc_dmawrite = write; 1449 ciab.icr = CIA_ICR_IR_SC | CIA_ICR_FLG; 1450 } else { 1451 FDDMASTART(ndmaw, write); 1452 fdc_dmalen = 0; 1453 } 1454 1455 #ifdef FDDEBUG 1456 printf(" dma started\n"); 1457 #endif 1458 } 1459 1460 /* 1461 * recalibrate the drive 1462 */ 1463 void 1464 fdcalibrate(arg) 1465 void *arg; 1466 { 1467 struct fd_softc *sc; 1468 static int loopcnt; 1469 1470 sc = arg; 1471 1472 if (loopcnt == 0) { 1473 /* 1474 * seek cyl 0 1475 */ 1476 fdc_indma = sc; 1477 sc->stepdelay += 900; 1478 if (sc->cachetrk > 1) 1479 fdsetpos(sc, sc->cachetrk % FDNHEADS, 0); 1480 sc->stepdelay -= 900; 1481 } 1482 if (loopcnt++ & 1) 1483 fdsetpos(sc, sc->cachetrk, 0); 1484 else 1485 fdsetpos(sc, sc->cachetrk + FDNHEADS, 0); 1486 /* 1487 * trk++, trk, trk++, trk, trk++, trk, trk++, trk and dma 1488 */ 1489 if (loopcnt < 8) 1490 callout_reset(&sc->calibrate_ch, hz / 8, fdcalibrate, sc); 1491 else { 1492 loopcnt = 0; 1493 fdc_indma = NULL; 1494 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1495 fddmastart(sc, sc->cachetrk); 1496 } 1497 } 1498 1499 void 1500 fddmadone(sc, timeo) 1501 struct fd_softc *sc; 1502 int timeo; 1503 { 1504 #ifdef FDDEBUG 1505 printf("fddmadone: unit %d, timeo %d\n", sc->hwunit, timeo); 1506 #endif 1507 fdc_indma = NULL; 1508 callout_stop(&sc->motor_ch); 1509 FDDMASTOP; 1510 1511 /* 1512 * guarantee the drive has been at current head and cyl 1513 * for at least FDWRITEDELAY after a write. 1514 */ 1515 if (sc->flags & FDF_WRITEWAIT) { 1516 delay(FDWRITEDELAY); 1517 sc->flags &= ~FDF_WRITEWAIT; 1518 } 1519 1520 if ((sc->flags & FDF_MOTOROFF) == 0) { 1521 /* 1522 * motor runs for 1.5 seconds after last dma 1523 */ 1524 callout_reset(&sc->motor_ch, 3 * hz / 2, fdmotoroff, sc); 1525 } 1526 if (sc->flags & FDF_DIRTY) { 1527 /* 1528 * if buffer dirty, the last dma cleaned it 1529 */ 1530 sc->flags &= ~FDF_DIRTY; 1531 if (timeo) 1532 printf("%s: write of track cache timed out.\n", 1533 sc->sc_dv.dv_xname); 1534 if (sc->flags & FDF_JUSTFLUSH) { 1535 sc->flags &= ~FDF_JUSTFLUSH; 1536 /* 1537 * we are done dma'ing 1538 */ 1539 fddone(sc); 1540 return; 1541 } 1542 /* 1543 * load the cache 1544 */ 1545 fddmastart(sc, sc->cachetrk); 1546 return; 1547 } 1548 #ifdef FDDEBUG 1549 else if (sc->flags & FDF_MOTOROFF) 1550 panic("fddmadone: FDF_MOTOROFF with no FDF_DIRTY"); 1551 #endif 1552 1553 /* 1554 * cache loaded decode it into cache buffer 1555 */ 1556 if (timeo == 0 && fdrawtocache(sc) == 0) 1557 sc->retried = 0; 1558 else { 1559 #ifdef FDDEBUG 1560 if (timeo) 1561 printf("%s: fddmadone: cache load timed out.\n", 1562 sc->sc_dv.dv_xname); 1563 #endif 1564 if (sc->retried >= sc->retries) { 1565 sc->retried = 0; 1566 sc->cachetrk = -1; 1567 } else { 1568 sc->retried++; 1569 /* 1570 * this will be restarted at end of calibrate loop. 1571 */ 1572 callout_stop(&sc->motor_ch); 1573 fdcalibrate(sc); 1574 return; 1575 } 1576 } 1577 fddone(sc); 1578 } 1579 1580 void 1581 fddone(sc) 1582 struct fd_softc *sc; 1583 { 1584 struct buf *dp, *bp; 1585 char *data; 1586 int sz; 1587 1588 #ifdef FDDEBUG 1589 printf("fddone: unit %d\n", sc->hwunit); 1590 #endif 1591 /* 1592 * check to see if unit is just flushing the cache, 1593 * that is we have no io queued. 1594 */ 1595 if (sc->flags & FDF_MOTOROFF) 1596 goto nobuf; 1597 1598 dp = &sc->curbuf; 1599 if ((bp = BUFQ_FIRST(&sc->bufq)) == NULL) 1600 panic ("fddone"); 1601 /* 1602 * check for an error that may have occurred 1603 * while getting the track. 1604 */ 1605 if (sc->cachetrk == -1) { 1606 sc->retried = 0; 1607 bp->b_flags |= B_ERROR; 1608 bp->b_error = EIO; 1609 } else if ((bp->b_flags & B_ERROR) == 0) { 1610 data = sc->cachep; 1611 /* 1612 * get offset of data in track cache and limit 1613 * the copy size to not exceed the cache's end. 1614 */ 1615 data += (dp->b_blkno % sc->nsectors) * FDSECSIZE; 1616 sz = sc->nsectors - dp->b_blkno % sc->nsectors; 1617 sz *= FDSECSIZE; 1618 sz = min(dp->b_bcount, sz); 1619 if (bp->b_flags & B_READ) 1620 bcopy(data, dp->b_data, sz); 1621 else { 1622 bcopy(dp->b_data, data, sz); 1623 sc->flags |= FDF_DIRTY; 1624 } 1625 bp->b_resid = dp->b_bcount - sz; 1626 if (bp->b_resid == 0) { 1627 bp->b_error = 0; 1628 } else { 1629 /* 1630 * not done yet need to read next track 1631 */ 1632 fdcont(sc); 1633 return; 1634 } 1635 } 1636 /* 1637 * remove from queue. 1638 */ 1639 BUFQ_REMOVE(&sc->bufq, bp); 1640 1641 disk_unbusy(&sc->dkdev, (bp->b_bcount - bp->b_resid)); 1642 1643 biodone(bp); 1644 nobuf: 1645 fdfindwork(sc->sc_dv.dv_unit); 1646 } 1647 1648 void 1649 fdfindwork(unit) 1650 int unit; 1651 { 1652 struct fd_softc *ssc, *sc; 1653 int i, last; 1654 1655 /* 1656 * first see if we have any fdopen()'s waiting 1657 */ 1658 if (fdc_wantwakeup) { 1659 wakeup(fdopen); 1660 fdc_wantwakeup--; 1661 return; 1662 } 1663 1664 /* 1665 * start next available unit, linear search from the next unit 1666 * wrapping and finally this unit. 1667 */ 1668 last = 0; 1669 ssc = NULL; 1670 for (i = unit + 1; last == 0; i++) { 1671 if (i == unit) 1672 last = 1; 1673 if (i >= fd_cd.cd_ndevs) { 1674 i = -1; 1675 continue; 1676 } 1677 if ((sc = fd_cd.cd_devs[i]) == NULL) 1678 continue; 1679 1680 /* 1681 * if unit has requested to be turned off 1682 * and it has no buf's queued do it now 1683 */ 1684 if (sc->flags & FDF_MOTOROFF) { 1685 if (BUFQ_FIRST(&sc->bufq) == NULL) 1686 fdmotoroff(sc); 1687 else { 1688 /* 1689 * we gained a buf request while 1690 * we waited, forget the motoroff 1691 */ 1692 sc->flags &= ~FDF_MOTOROFF; 1693 } 1694 /* 1695 * if we now have dma unit must have needed 1696 * flushing, quit 1697 */ 1698 if (fdc_indma) 1699 return; 1700 } 1701 /* 1702 * if we have no start unit and the current unit has 1703 * io waiting choose this unit to start. 1704 */ 1705 if (ssc == NULL && BUFQ_FIRST(&sc->bufq) != NULL) 1706 ssc = sc; 1707 } 1708 if (ssc) 1709 fdstart(ssc); 1710 } 1711 1712 /* 1713 * min byte count to whats left of the track in question 1714 */ 1715 void 1716 fdminphys(bp) 1717 struct buf *bp; 1718 { 1719 struct fd_softc *sc; 1720 int trk, sec, toff, tsz; 1721 1722 sc = vdev_privdata(bp->b_devvp); 1723 1724 trk = bp->b_blkno / sc->nsectors; 1725 sec = bp->b_blkno % sc->nsectors; 1726 1727 toff = sec * FDSECSIZE; 1728 tsz = sc->nsectors * FDSECSIZE; 1729 #ifdef FDDEBUG 1730 printf("fdminphys: before %d", bp->b_bcount); 1731 #endif 1732 bp->b_bcount = min(bp->b_bcount, tsz - toff); 1733 #ifdef FDDEBUG 1734 printf(" after %d\n", bp->b_bcount); 1735 #endif 1736 minphys(bp); 1737 } 1738 1739 /* 1740 * encode the track cache into raw MFM ready for dma 1741 * when we go to multiple disk formats, this will call type dependent 1742 * functions 1743 */ 1744 void fdcachetoraw(sc) 1745 struct fd_softc *sc; 1746 { 1747 if (sc->openpart == FDMSDOSPART) 1748 mscachetoraw(sc); 1749 else 1750 amcachetoraw(sc); 1751 } 1752 1753 /* 1754 * decode raw MFM from dma into units track cache. 1755 * when we go to multiple disk formats, this will call type dependent 1756 * functions 1757 */ 1758 int 1759 fdrawtocache(sc) 1760 struct fd_softc *sc; 1761 { 1762 1763 if (sc->openpart == FDMSDOSPART) 1764 return(msrawtocache(sc)); 1765 else 1766 return(amrawtocache(sc)); 1767 } 1768 1769 void 1770 amcachetoraw(sc) 1771 struct fd_softc *sc; 1772 { 1773 static u_long mfmnull[4]; 1774 u_long *rp, *crp, *dp, hcksum, dcksum, info, zero; 1775 int sec, i; 1776 1777 rp = fdc_dmap; 1778 1779 /* 1780 * not yet one sector (- 1 long) gap. 1781 * for now use previous drivers values 1782 */ 1783 for (i = 0; i < sc->type->gap; i++) 1784 *rp++ = 0xaaaaaaaa; 1785 /* 1786 * process sectors 1787 */ 1788 dp = sc->cachep; 1789 zero = 0; 1790 info = 0xff000000 | (sc->cachetrk << 16) | sc->nsectors; 1791 for (sec = 0; sec < sc->nsectors; sec++, info += (1 << 8) - 1) { 1792 hcksum = dcksum = 0; 1793 /* 1794 * sector format 1795 * offset description 1796 *----------------------------------- 1797 * 0 null 1798 * 1 sync 1799 * oddbits evenbits 1800 *---------------------- 1801 * 2 3 [0xff]b [trk]b [sec]b [togap]b 1802 * 4-7 8-11 null 1803 * 12 13 header cksum [2-11] 1804 * 14 15 data cksum [16-271] 1805 * 16-143 144-271 data 1806 */ 1807 *rp = 0xaaaaaaaa; 1808 if (*(rp - 1) & 0x1) 1809 *rp &= 0x7fffffff; /* clock bit correction */ 1810 rp++; 1811 *rp++ = (FDMFMSYNC << 16) | FDMFMSYNC; 1812 rp = mfmblkencode(&info, rp, &hcksum, 1); 1813 rp = mfmblkencode(mfmnull, rp, &hcksum, 4); 1814 rp = mfmblkencode(&hcksum, rp, NULL, 1); 1815 1816 crp = rp; 1817 rp = mfmblkencode(dp, rp + 2, &dcksum, FDSECLWORDS); 1818 dp += FDSECLWORDS; 1819 crp = mfmblkencode(&dcksum, crp, NULL, 1); 1820 if (*(crp - 1) & 0x1) 1821 *crp &= 0x7fffffff; /* clock bit correction */ 1822 else if ((*crp & 0x40000000) == 0) 1823 *crp |= 0x80000000; 1824 } 1825 *rp = 0xaaa80000; 1826 if (*(rp - 1) & 0x1) 1827 *rp &= 0x7fffffff; 1828 } 1829 1830 u_long * 1831 fdfindsync(rp, ep) 1832 u_long *rp, *ep; 1833 { 1834 u_short *sp; 1835 1836 sp = (u_short *)rp; 1837 while ((u_long *)sp < ep && *sp != FDMFMSYNC) 1838 sp++; 1839 while ((u_long *)sp < ep && *sp == FDMFMSYNC) 1840 sp++; 1841 if ((u_long *)sp < ep) 1842 return((u_long *)sp); 1843 return(NULL); 1844 } 1845 1846 int 1847 amrawtocache(sc) 1848 struct fd_softc *sc; 1849 { 1850 u_long mfmnull[4]; 1851 u_long *dp, *rp, *erp, *crp, *srp, hcksum, dcksum, info, cktmp; 1852 int cnt, doagain; 1853 1854 doagain = 1; 1855 srp = rp = fdc_dmap; 1856 erp = (u_long *)((u_short *)rp + sc->type->nreadw); 1857 cnt = 0; 1858 again: 1859 if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) { 1860 #ifdef DIAGNOSTIC 1861 printf("%s: corrupted track (%d) data.\n", 1862 sc->sc_dv.dv_xname, sc->cachetrk); 1863 #endif 1864 return(-1); 1865 } 1866 1867 /* 1868 * process sectors 1869 */ 1870 for (; cnt < sc->nsectors; cnt++) { 1871 hcksum = dcksum = 0; 1872 rp = mfmblkdecode(rp, &info, &hcksum, 1); 1873 rp = mfmblkdecode(rp, mfmnull, &hcksum, 4); 1874 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1875 if (cktmp != hcksum) { 1876 #ifdef FDDEBUG 1877 printf(" info 0x%x hchksum 0x%x trkhcksum 0x%x\n", 1878 info, hcksum, cktmp); 1879 #endif 1880 goto again; 1881 } 1882 if (((info >> 16) & 0xff) != sc->cachetrk) { 1883 #ifdef DEBUG 1884 printf("%s: incorrect track found: 0x%lx %d\n", 1885 sc->sc_dv.dv_xname, info, sc->cachetrk); 1886 #endif 1887 goto again; 1888 } 1889 #ifdef FDDEBUG 1890 printf(" info 0x%x\n", info); 1891 #endif 1892 1893 rp = mfmblkdecode(rp, &cktmp, NULL, 1); 1894 dp = sc->cachep; 1895 dp += FDSECLWORDS * ((info >> 8) & 0xff); 1896 crp = mfmblkdecode(rp, dp, &dcksum, FDSECLWORDS); 1897 if (cktmp != dcksum) { 1898 #ifdef FDDEBUG 1899 printf(" info 0x%x dchksum 0x%x trkdcksum 0x%x\n", 1900 info, dcksum, cktmp); 1901 #endif 1902 goto again; 1903 } 1904 1905 /* 1906 * if we are at gap then we can no longer be sure 1907 * of correct sync marks 1908 */ 1909 if ((info && 0xff) == 1) 1910 doagain = 1; 1911 else 1912 doagain = 0; 1913 srp = rp = fdfindsync(crp, erp); 1914 } 1915 return(0); 1916 } 1917 1918 void 1919 mscachetoraw(sc) 1920 struct fd_softc *sc; 1921 { 1922 u_short *rp, *erp, crc; 1923 u_char *cp, tb[5]; 1924 int sec, i; 1925 1926 rp = (u_short *)fdc_dmap; 1927 erp = rp + sc->type->nwritew; 1928 cp = sc->cachep; 1929 1930 /* 1931 * initial track filler (828 * GAP1) 1932 */ 1933 for (i = 0; i < sc->type->gap; i++) { 1934 *rp++ = FDMFMGAP1; 1935 *rp++ = FDMFMGAP1; 1936 } 1937 1938 for (sec = 0; sec < sc->nsectors; sec++) { 1939 1940 /* 1941 * leading sector gap 1942 * (12 * GAP2) + (3 * SYNC) 1943 */ 1944 for (i = 0; i < 12; i++) 1945 *rp++ = FDMFMGAP2; 1946 *rp++ = FDMFMSYNC; 1947 *rp++ = FDMFMSYNC; 1948 *rp++ = FDMFMSYNC; 1949 1950 /* 1951 * sector information 1952 * (ID) + track + side + sector + sector size + CRC16 1953 */ 1954 *rp++ = FDMFMID; 1955 tb[0] = sc->cachetrk / FDNHEADS; 1956 tb[1] = sc->cachetrk % FDNHEADS; 1957 tb[2] = sec + 1; 1958 i = sc->bytespersec; 1959 tb[3] = i < 256 ? 0 : (i < 512 ? 1 : (i < 1024 ? 2 : 3)); 1960 rp = msblkencode(rp, tb, 4, &crc); 1961 tb[0] = crc >> 8; 1962 tb[1] = crc & 0xff; 1963 tb[2] = 0x4e; /* GAP1 decoded */ 1964 rp = msblkencode(rp, tb, 3, 0); 1965 1966 /* 1967 * sector info/data gap 1968 * (22 * GAP1) + (12 * GAP2) + (3 * SYNC) 1969 */ 1970 for (i = 0; i < 21; i++) 1971 *rp++ = FDMFMGAP1; 1972 for (i = 0; i < 12; i++) 1973 *rp++ = FDMFMGAP2; 1974 *rp++ = FDMFMSYNC; 1975 *rp++ = FDMFMSYNC; 1976 *rp++ = FDMFMSYNC; 1977 1978 /* 1979 * sector data 1980 * (DATA) + ...data... + CRC16 1981 */ 1982 *rp++ = FDMFMDATA; 1983 rp = msblkencode(rp, cp, sc->bytespersec, &crc); 1984 cp += sc->bytespersec; 1985 tb[0] = crc >> 8; 1986 tb[1] = crc & 0xff; 1987 tb[2] = 0x4e; /* GAP3 decoded */ 1988 rp = msblkencode(rp, tb, 3, 0); 1989 1990 /* 1991 * trailing sector gap 1992 * (80 * GAP3) 1993 */ 1994 for (i = 0; i < 79; i++) 1995 *rp++ = FDMFMGAP3; 1996 } 1997 1998 /* 1999 * fill rest of track with GAP3 2000 */ 2001 while (rp != erp) 2002 *rp++ = FDMFMGAP3; 2003 2004 } 2005 2006 int 2007 msrawtocache(sc) 2008 struct fd_softc *sc; 2009 { 2010 u_short *rp, *srp, *erp; 2011 u_char tb[5], *cp; 2012 int ct, sec, retry; 2013 2014 srp = rp = (u_short *)fdc_dmap; 2015 erp = rp + sc->type->nreadw; 2016 cp = sc->cachep; 2017 2018 for (ct = 0; ct < sc->nsectors; ct++) { 2019 retry = 1; 2020 do { 2021 /* 2022 * skip leading gap to sync 2023 */ 2024 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) { 2025 #ifdef DIAGNOSTIC 2026 printf("%s: corrupted track (%d) data.\n", 2027 sc->sc_dv.dv_xname, sc->cachetrk); 2028 #endif 2029 return(-1); 2030 } 2031 2032 /* 2033 * Grab sector info 2034 */ 2035 if (*rp++ != FDMFMID) 2036 continue; 2037 rp = msblkdecode(rp, tb, 4); 2038 #ifdef FDDEBUG 2039 printf("sector id: sector %d, track %d, side %d," 2040 "bps %d\n", tb[2], tb[0], tb[1], 128 << tb[3]); 2041 #endif 2042 if ((tb[0] * FDNHEADS + tb[1]) != sc->cachetrk || 2043 tb[2] > sc->nsectors) 2044 continue; 2045 2046 sec = tb[2]; 2047 sc->bytespersec = 128 << tb[3]; 2048 rp += 2; /* skip CRC-16 */ 2049 2050 /* 2051 * skip gap and read in data 2052 */ 2053 if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) 2054 return(-1); 2055 if (*rp++ != FDMFMDATA) 2056 continue; 2057 rp = msblkdecode(rp, cp + ((sec-1) * sc->bytespersec), 2058 sc->bytespersec); 2059 rp += 2; /* skip CRC-16 */ 2060 2061 retry = 0; 2062 } while (retry); 2063 } 2064 return(0); 2065 } 2066 2067 /* 2068 * encode len longwords of `dp' data in amiga mfm block format (`rp') 2069 * this format specified that the odd bits are at current pos and even 2070 * bits at len + current pos 2071 */ 2072 u_long * 2073 mfmblkencode(dp, rp, cp, len) 2074 u_long *dp, *rp, *cp; 2075 int len; 2076 { 2077 u_long *sdp, *edp, d, dtmp, correct; 2078 2079 sdp = dp; 2080 edp = dp + len; 2081 2082 if (*(rp - 1) & 0x1) 2083 correct = 1; 2084 else 2085 correct = 0; 2086 /* 2087 * do odd bits 2088 */ 2089 while (dp < edp) { 2090 d = (*dp >> 1) & 0x55555555; /* remove clock bits */ 2091 dtmp = d ^ 0x55555555; 2092 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2093 /* 2094 * correct upper clock bit if needed 2095 */ 2096 if (correct) 2097 d &= 0x7fffffff; 2098 if (d & 0x1) 2099 correct = 1; 2100 else 2101 correct = 0; 2102 /* 2103 * do checksums and store in raw buffer 2104 */ 2105 if (cp) 2106 *cp ^= d; 2107 *rp++ = d; 2108 dp++; 2109 } 2110 /* 2111 * do even bits 2112 */ 2113 dp = sdp; 2114 while (dp < edp) { 2115 d = *dp & 0x55555555; /* remove clock bits */ 2116 dtmp = d ^ 0x55555555; 2117 d |= ((dtmp >> 1) | 0x80000000) & (dtmp << 1); 2118 /* 2119 * correct upper clock bit if needed 2120 */ 2121 if (correct) 2122 d &= 0x7fffffff; 2123 if (d & 0x1) 2124 correct = 1; 2125 else 2126 correct = 0; 2127 /* 2128 * do checksums and store in raw buffer 2129 */ 2130 if (cp) 2131 *cp ^= d; 2132 *rp++ = d; 2133 dp++; 2134 } 2135 if (cp) 2136 *cp &= 0x55555555; 2137 return(rp); 2138 } 2139 2140 /* 2141 * decode len longwords of `dp' data in amiga mfm block format (`rp') 2142 * this format specified that the odd bits are at current pos and even 2143 * bits at len + current pos 2144 */ 2145 u_long * 2146 mfmblkdecode(rp, dp, cp, len) 2147 u_long *rp, *dp, *cp; 2148 int len; 2149 { 2150 u_long o, e; 2151 int cnt; 2152 2153 cnt = len; 2154 while (cnt--) { 2155 o = *rp; 2156 e = *(rp + len); 2157 if (cp) { 2158 *cp ^= o; 2159 *cp ^= e; 2160 } 2161 o &= 0x55555555; 2162 e &= 0x55555555; 2163 *dp++ = (o << 1) | e; 2164 rp++; 2165 } 2166 if (cp) 2167 *cp &= 0x55555555; 2168 return(rp + len); 2169 } 2170 2171 /* 2172 * decode len words in standard MFM format to len bytes 2173 * of data. 2174 */ 2175 u_short * 2176 msblkdecode(rp, cp, len) 2177 u_short *rp; 2178 u_char *cp; 2179 int len; 2180 { 2181 while (len--) { 2182 *cp++ = msdecode[*rp & 0x7f] | 2183 (msdecode[(*rp >> 8) & 0x7f] << 4); 2184 rp++; 2185 } 2186 2187 return(rp); 2188 } 2189 2190 /* 2191 * encode len bytes of data into len words in standard MFM format. 2192 * If a pointer is supplied for crc, calculate the CRC-16 of the data 2193 * as well. 2194 */ 2195 u_short * 2196 msblkencode(rp, cp, len, crc) 2197 u_short *rp; 2198 u_char *cp; 2199 int len; 2200 u_short *crc; 2201 { 2202 u_short td; 2203 u_short mycrc; 2204 2205 /* preload crc for header (4 bytes) 2206 * or data (anything else) 2207 */ 2208 mycrc = (len == 4) ? 0xb230 : 0xe295; 2209 2210 while (len--) { 2211 td = (msencode[*cp >> 4] << 8) | msencode[*cp & 0x0f]; 2212 2213 /* Check for zeros in top bit of encode and bottom 2214 * bit of previous encode. if so, slap a one in betweem 2215 * them. 2216 */ 2217 if ((td & 0x140) == 0) 2218 td |= 0x80; 2219 if ((td & 0x4000) == 0 && (rp[-1] & 1) == 0) 2220 td |= 0x8000; 2221 2222 *rp++ = td; 2223 2224 /* 2225 * calc crc if requested 2226 */ 2227 if (crc) 2228 mycrc = (mycrc << 8) ^ mscrctab[*cp ^ (mycrc >> 8)]; 2229 2230 cp++; 2231 } 2232 2233 if (crc) 2234 *crc = mycrc; 2235 2236 return(rp); 2237 } 2238 2239 int 2240 fddump(dev, blkno, va, size) 2241 dev_t dev; 2242 daddr_t blkno; 2243 caddr_t va; 2244 size_t size; 2245 { 2246 return (EINVAL); 2247 } 2248
Indexes created Thu Oct 02 14:10:14 GMT 2025