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1 /*
2 * QEMU Floppy disk emulator (Intel 82078)
3 *
4 * Copyright (c) 2003, 2007 Jocelyn Mayer
5 * Copyright (c) 2008 Hervé Poussineau
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25 /*
26 * The controller is used in Sun4m systems in a slightly different
27 * way. There are changes in DOR register and DMA is not available.
28 */
29
30 #include "qemu/osdep.h"
31 #include "hw/block/fdc.h"
32 #include "qapi/error.h"
33 #include "qemu/error-report.h"
34 #include "qemu/timer.h"
35 #include "qemu/memalign.h"
36 #include "hw/core/irq.h"
37 #include "hw/isa/isa.h"
38 #include "hw/core/qdev-properties.h"
39 #include "hw/core/qdev-properties-system.h"
40 #include "migration/vmstate.h"
41 #include "hw/block/block.h"
42 #include "system/block-backend.h"
43 #include "system/blockdev.h"
44 #include "system/system.h"
45 #include "qemu/log.h"
46 #include "qemu/main-loop.h"
47 #include "qemu/module.h"
48 #include "trace.h"
49 #include "qom/object.h"
50 #include "fdc-internal.h"
51
52 /********************************************************/
53 /* debug Floppy devices */
54
55 #define DEBUG_FLOPPY 0
56
57 #define FLOPPY_DPRINTF(fmt, ...) \
58 do { \
59 if (DEBUG_FLOPPY) { \
60 fprintf(stderr, "FLOPPY: " fmt , ## __VA_ARGS__); \
61 } \
62 } while (0)
63
64
65 /* Anonymous BlockBackend for empty drive */
66 static BlockBackend *blk_create_empty_drive(void)
67 {
68 return blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
69 }
70
71 /********************************************************/
72 /* qdev floppy bus */
73
74 #define TYPE_FLOPPY_BUS "floppy-bus"
75 OBJECT_DECLARE_SIMPLE_TYPE(FloppyBus, FLOPPY_BUS)
76
77 static FDrive *get_drv(FDCtrl *fdctrl, int unit);
78
79 static const TypeInfo floppy_bus_info = {
80 .name = TYPE_FLOPPY_BUS,
81 .parent = TYPE_BUS,
82 .instance_size = sizeof(FloppyBus),
83 };
84
85 static void floppy_bus_create(FDCtrl *fdc, FloppyBus *bus, DeviceState *dev)
86 {
87 qbus_init(bus, sizeof(FloppyBus), TYPE_FLOPPY_BUS, dev, NULL);
88 bus->fdc = fdc;
89 }
90
91
92 /********************************************************/
93 /* Floppy drive emulation */
94
95 /* In many cases, the total sector size of a format is enough to uniquely
96 * identify it. However, there are some total sector collisions between
97 * formats of different physical size, and these are noted below by
98 * highlighting the total sector size for entries with collisions. */
99 const FDFormat fd_formats[] = {
100 /* First entry is default format */
101 /* 1.44 MB 3"1/2 floppy disks */
102 { FLOPPY_DRIVE_TYPE_144, 18, 80, 1, FDRIVE_RATE_500K, }, /* 3.5" 2880 */
103 { FLOPPY_DRIVE_TYPE_144, 20, 80, 1, FDRIVE_RATE_500K, }, /* 3.5" 3200 */
104 { FLOPPY_DRIVE_TYPE_144, 21, 80, 1, FDRIVE_RATE_500K, },
105 { FLOPPY_DRIVE_TYPE_144, 21, 82, 1, FDRIVE_RATE_500K, },
106 { FLOPPY_DRIVE_TYPE_144, 21, 83, 1, FDRIVE_RATE_500K, },
107 { FLOPPY_DRIVE_TYPE_144, 22, 80, 1, FDRIVE_RATE_500K, },
108 { FLOPPY_DRIVE_TYPE_144, 23, 80, 1, FDRIVE_RATE_500K, },
109 { FLOPPY_DRIVE_TYPE_144, 24, 80, 1, FDRIVE_RATE_500K, },
110 /* 2.88 MB 3"1/2 floppy disks */
111 { FLOPPY_DRIVE_TYPE_288, 36, 80, 1, FDRIVE_RATE_1M, },
112 { FLOPPY_DRIVE_TYPE_288, 39, 80, 1, FDRIVE_RATE_1M, },
113 { FLOPPY_DRIVE_TYPE_288, 40, 80, 1, FDRIVE_RATE_1M, },
114 { FLOPPY_DRIVE_TYPE_288, 44, 80, 1, FDRIVE_RATE_1M, },
115 { FLOPPY_DRIVE_TYPE_288, 48, 80, 1, FDRIVE_RATE_1M, },
116 /* 720 kB 3"1/2 floppy disks */
117 { FLOPPY_DRIVE_TYPE_144, 9, 80, 1, FDRIVE_RATE_250K, }, /* 3.5" 1440 */
118 { FLOPPY_DRIVE_TYPE_144, 10, 80, 1, FDRIVE_RATE_250K, },
119 { FLOPPY_DRIVE_TYPE_144, 10, 82, 1, FDRIVE_RATE_250K, },
120 { FLOPPY_DRIVE_TYPE_144, 10, 83, 1, FDRIVE_RATE_250K, },
121 { FLOPPY_DRIVE_TYPE_144, 13, 80, 1, FDRIVE_RATE_250K, },
122 { FLOPPY_DRIVE_TYPE_144, 14, 80, 1, FDRIVE_RATE_250K, },
123 /* 1.2 MB 5"1/4 floppy disks */
124 { FLOPPY_DRIVE_TYPE_120, 15, 80, 1, FDRIVE_RATE_500K, },
125 { FLOPPY_DRIVE_TYPE_120, 18, 80, 1, FDRIVE_RATE_500K, }, /* 5.25" 2880 */
126 { FLOPPY_DRIVE_TYPE_120, 18, 82, 1, FDRIVE_RATE_500K, },
127 { FLOPPY_DRIVE_TYPE_120, 18, 83, 1, FDRIVE_RATE_500K, },
128 { FLOPPY_DRIVE_TYPE_120, 20, 80, 1, FDRIVE_RATE_500K, }, /* 5.25" 3200 */
129 /* 720 kB 5"1/4 floppy disks */
130 { FLOPPY_DRIVE_TYPE_120, 9, 80, 1, FDRIVE_RATE_250K, }, /* 5.25" 1440 */
131 { FLOPPY_DRIVE_TYPE_120, 11, 80, 1, FDRIVE_RATE_250K, },
132 /* 360 kB 5"1/4 floppy disks */
133 { FLOPPY_DRIVE_TYPE_120, 9, 40, 1, FDRIVE_RATE_300K, }, /* 5.25" 720 */
134 { FLOPPY_DRIVE_TYPE_120, 9, 40, 0, FDRIVE_RATE_300K, },
135 { FLOPPY_DRIVE_TYPE_120, 10, 41, 1, FDRIVE_RATE_300K, },
136 { FLOPPY_DRIVE_TYPE_120, 10, 42, 1, FDRIVE_RATE_300K, },
137 /* 320 kB 5"1/4 floppy disks */
138 { FLOPPY_DRIVE_TYPE_120, 8, 40, 1, FDRIVE_RATE_250K, },
139 { FLOPPY_DRIVE_TYPE_120, 8, 40, 0, FDRIVE_RATE_250K, },
140 /* 360 kB must match 5"1/4 better than 3"1/2... */
141 { FLOPPY_DRIVE_TYPE_144, 9, 80, 0, FDRIVE_RATE_250K, }, /* 3.5" 720 */
142 /* end */
143 { FLOPPY_DRIVE_TYPE_NONE, -1, -1, 0, 0, },
144 };
145
146 static FDriveSize drive_size(FloppyDriveType drive)
147 {
148 switch (drive) {
149 case FLOPPY_DRIVE_TYPE_120:
150 return FDRIVE_SIZE_525;
151 case FLOPPY_DRIVE_TYPE_144:
152 case FLOPPY_DRIVE_TYPE_288:
153 return FDRIVE_SIZE_350;
154 default:
155 return FDRIVE_SIZE_UNKNOWN;
156 }
157 }
158
159 #define GET_CUR_DRV(fdctrl) ((fdctrl)->cur_drv)
160 #define SET_CUR_DRV(fdctrl, drive) ((fdctrl)->cur_drv = (drive))
161
162 /* Will always be a fixed parameter for us */
163 #define FD_SECTOR_LEN 512
164 #define FD_SECTOR_SC 2 /* Sector size code */
165 #define FD_RESET_SENSEI_COUNT 4 /* Number of sense interrupts on RESET */
166
167
168 static FloppyDriveType get_fallback_drive_type(FDrive *drv);
169
170 /* Hack: FD_SEEK is expected to work on empty drives. However, QEMU
171 * currently goes through some pains to keep seeks within the bounds
172 * established by last_sect and max_track. Correcting this is difficult,
173 * as refactoring FDC code tends to expose nasty bugs in the Linux kernel.
174 *
175 * For now: allow empty drives to have large bounds so we can seek around,
176 * with the understanding that when a diskette is inserted, the bounds will
177 * properly tighten to match the geometry of that inserted medium.
178 */
179 static void fd_empty_seek_hack(FDrive *drv)
180 {
181 drv->last_sect = 0xFF;
182 drv->max_track = 0xFF;
183 }
184
185 static void fd_init(FDrive *drv)
186 {
187 /* Drive */
188 drv->perpendicular = 0;
189 /* Disk */
190 drv->disk = FLOPPY_DRIVE_TYPE_NONE;
191 drv->last_sect = 0;
192 drv->max_track = 0;
193 drv->ro = true;
194 drv->media_changed = 1;
195 }
196
197 #define NUM_SIDES(drv) ((drv)->flags & FDISK_DBL_SIDES ? 2 : 1)
198
199 /* Is a diskette present in the drive? */
200 static bool fd_media_present(FDrive *drv)
201 {
202 return drv->blk != NULL && blk_is_inserted(drv->blk);
203 }
204
205 static int fd_sector_calc(uint8_t head, uint8_t track, uint8_t sect,
206 uint8_t last_sect, uint8_t num_sides)
207 {
208 return (((track * num_sides) + head) * last_sect) + sect - 1;
209 }
210
211 /* Returns current position, in sectors, for given drive */
212 static int fd_sector(FDrive *drv)
213 {
214 return fd_sector_calc(drv->head, drv->track, drv->sect, drv->last_sect,
215 NUM_SIDES(drv));
216 }
217
218 /* Returns current position, in bytes, for given drive */
219 static int fd_offset(FDrive *drv)
220 {
221 g_assert(fd_sector(drv) < INT_MAX >> BDRV_SECTOR_BITS);
222 return fd_sector(drv) << BDRV_SECTOR_BITS;
223 }
224
225 /* Seek to a new position:
226 * returns 0 if already on right track
227 * returns 1 if track changed
228 * returns 2 if track is invalid
229 * returns 3 if sector is invalid
230 * returns 4 if seek is disabled
231 * returns 5 if no floppy is inserted
232 */
233 static int fd_seek(FDrive *drv, uint8_t head, uint8_t track, uint8_t sect,
234 int enable_seek)
235 {
236 uint32_t sector;
237 int ret;
238
239 if (track > drv->max_track ||
240 (head != 0 && (drv->flags & FDISK_DBL_SIDES) == 0)) {
241 FLOPPY_DPRINTF("try to read %d %02x %02x (max=%d %d %02x %02x)\n",
242 head, track, sect, 1,
243 (drv->flags & FDISK_DBL_SIDES) == 0 ? 0 : 1,
244 drv->max_track, drv->last_sect);
245 return 2;
246 }
247 if (sect > drv->last_sect) {
248 FLOPPY_DPRINTF("try to read %d %02x %02x (max=%d %d %02x %02x)\n",
249 head, track, sect, 1,
250 (drv->flags & FDISK_DBL_SIDES) == 0 ? 0 : 1,
251 drv->max_track, drv->last_sect);
252 return 3;
253 }
254 sector = fd_sector_calc(head, track, sect, drv->last_sect, NUM_SIDES(drv));
255 ret = 0;
256 if (sector != fd_sector(drv)) {
257 #if 0
258 if (!enable_seek) {
259 FLOPPY_DPRINTF("error: no implicit seek %d %02x %02x"
260 " (max=%d %02x %02x)\n",
261 head, track, sect, 1, drv->max_track,
262 drv->last_sect);
263 return 4;
264 }
265 #endif
266 drv->head = head;
267 if (drv->track != track) {
268 if (fd_media_present(drv)) {
269 drv->media_changed = 0;
270 }
271 ret = 1;
272 }
273 drv->track = track;
274 drv->sect = sect;
275 }
276
277 if (!fd_media_present(drv)) {
278 ret = 5;
279 }
280
281 return ret;
282 }
283
284 /* Set drive back to track 0 */
285 static void fd_recalibrate(FDrive *drv)
286 {
287 FLOPPY_DPRINTF("recalibrate\n");
288 fd_seek(drv, 0, 0, 1, 1);
289 }
290
291 /**
292 * Determine geometry based on inserted diskette.
293 * Will not operate on an empty drive.
294 *
295 * @return: 0 on success, -1 if the drive is empty.
296 */
297 static int pick_geometry(FDrive *drv)
298 {
299 BlockBackend *blk = drv->blk;
300 const FDFormat *parse;
301 uint64_t nb_sectors, size;
302 int i;
303 int match, size_match, type_match;
304 bool magic = drv->drive == FLOPPY_DRIVE_TYPE_AUTO;
305
306 /* We can only pick a geometry if we have a diskette. */
307 if (!drv->blk || !blk_is_inserted(drv->blk) ||
308 drv->drive == FLOPPY_DRIVE_TYPE_NONE)
309 {
310 return -1;
311 }
312
313 /* We need to determine the likely geometry of the inserted medium.
314 * In order of preference, we look for:
315 * (1) The same drive type and number of sectors,
316 * (2) The same diskette size and number of sectors,
317 * (3) The same drive type.
318 *
319 * In all cases, matches that occur higher in the drive table will take
320 * precedence over matches that occur later in the table.
321 */
322 blk_get_geometry(blk, &nb_sectors);
323 match = size_match = type_match = -1;
324 for (i = 0; ; i++) {
325 parse = &fd_formats[i];
326 if (parse->drive == FLOPPY_DRIVE_TYPE_NONE) {
327 break;
328 }
329 size = (parse->max_head + 1) * parse->max_track * parse->last_sect;
330 if (nb_sectors == size) {
331 if (magic || parse->drive == drv->drive) {
332 /* (1) perfect match -- nb_sectors and drive type */
333 goto out;
334 } else if (drive_size(parse->drive) == drive_size(drv->drive)) {
335 /* (2) size match -- nb_sectors and physical medium size */
336 match = (match == -1) ? i : match;
337 } else {
338 /* This is suspicious -- Did the user misconfigure? */
339 size_match = (size_match == -1) ? i : size_match;
340 }
341 } else if (type_match == -1) {
342 if ((parse->drive == drv->drive) ||
343 (magic && (parse->drive == get_fallback_drive_type(drv)))) {
344 /* (3) type match -- nb_sectors mismatch, but matches the type
345 * specified explicitly by the user, or matches the fallback
346 * default type when using the drive autodetect mechanism */
347 type_match = i;
348 }
349 }
350 }
351
352 /* No exact match found */
353 if (match == -1) {
354 if (size_match != -1) {
355 parse = &fd_formats[size_match];
356 FLOPPY_DPRINTF("User requested floppy drive type '%s', "
357 "but inserted medium appears to be a "
358 "%"PRId64" sector '%s' type\n",
359 FloppyDriveType_str(drv->drive),
360 nb_sectors,
361 FloppyDriveType_str(parse->drive));
362 }
363 assert(type_match != -1 && "misconfigured fd_format");
364 match = type_match;
365 }
366 parse = &(fd_formats[match]);
367
368 out:
369 if (parse->max_head == 0) {
370 drv->flags &= ~FDISK_DBL_SIDES;
371 } else {
372 drv->flags |= FDISK_DBL_SIDES;
373 }
374 drv->max_track = parse->max_track;
375 drv->last_sect = parse->last_sect;
376 drv->disk = parse->drive;
377 drv->media_rate = parse->rate;
378 return 0;
379 }
380
381 static void pick_drive_type(FDrive *drv)
382 {
383 if (drv->drive != FLOPPY_DRIVE_TYPE_AUTO) {
384 return;
385 }
386
387 if (pick_geometry(drv) == 0) {
388 drv->drive = drv->disk;
389 } else {
390 drv->drive = get_fallback_drive_type(drv);
391 }
392
393 g_assert(drv->drive != FLOPPY_DRIVE_TYPE_AUTO);
394 }
395
396 /* Revalidate a disk drive after a disk change */
397 static void fd_revalidate(FDrive *drv)
398 {
399 int rc;
400
401 FLOPPY_DPRINTF("revalidate\n");
402 if (drv->blk != NULL) {
403 drv->ro = !blk_is_writable(drv->blk);
404 if (!blk_is_inserted(drv->blk)) {
405 FLOPPY_DPRINTF("No disk in drive\n");
406 drv->disk = FLOPPY_DRIVE_TYPE_NONE;
407 fd_empty_seek_hack(drv);
408 } else if (!drv->media_validated) {
409 rc = pick_geometry(drv);
410 if (rc) {
411 FLOPPY_DPRINTF("Could not validate floppy drive media");
412 } else {
413 drv->media_validated = true;
414 FLOPPY_DPRINTF("Floppy disk (%d h %d t %d s) %s\n",
415 (drv->flags & FDISK_DBL_SIDES) ? 2 : 1,
416 drv->max_track, drv->last_sect,
417 drv->ro ? "ro" : "rw");
418 }
419 }
420 } else {
421 FLOPPY_DPRINTF("No drive connected\n");
422 drv->last_sect = 0;
423 drv->max_track = 0;
424 drv->flags &= ~FDISK_DBL_SIDES;
425 drv->drive = FLOPPY_DRIVE_TYPE_NONE;
426 drv->disk = FLOPPY_DRIVE_TYPE_NONE;
427 }
428 }
429
430 static void fd_change_cb(void *opaque, bool load, Error **errp)
431 {
432 FDrive *drive = opaque;
433
434 if (!load) {
435 blk_set_perm(drive->blk, 0, BLK_PERM_ALL, &error_abort);
436 } else {
437 if (!blkconf_apply_backend_options(drive->conf,
438 !blk_supports_write_perm(drive->blk),
439 false, errp)) {
440 return;
441 }
442 }
443
444 drive->media_changed = 1;
445 drive->media_validated = false;
446 fd_revalidate(drive);
447 }
448
449 static const BlockDevOps fd_block_ops = {
450 .change_media_cb = fd_change_cb,
451 };
452
453
454 #define TYPE_FLOPPY_DRIVE "floppy"
455 OBJECT_DECLARE_SIMPLE_TYPE(FloppyDrive, FLOPPY_DRIVE)
456
457 struct FloppyDrive {
458 DeviceState qdev;
459 uint32_t unit;
460 BlockConf conf;
461 FloppyDriveType type;
462 };
463
464 static const Property floppy_drive_properties[] = {
465 DEFINE_PROP_UINT32("unit", FloppyDrive, unit, -1),
466 DEFINE_BLOCK_PROPERTIES(FloppyDrive, conf),
467 DEFINE_PROP_SIGNED("drive-type", FloppyDrive, type,
468 FLOPPY_DRIVE_TYPE_AUTO, qdev_prop_fdc_drive_type,
469 FloppyDriveType),
470 };
471
472 static void floppy_drive_realize(DeviceState *qdev, Error **errp)
473 {
474 FloppyDrive *dev = FLOPPY_DRIVE(qdev);
475 FloppyBus *bus = FLOPPY_BUS(qdev->parent_bus);
476 FDrive *drive;
477 bool read_only;
478 int ret;
479
480 if (dev->unit == -1) {
481 for (dev->unit = 0; dev->unit < MAX_FD; dev->unit++) {
482 drive = get_drv(bus->fdc, dev->unit);
483 if (!drive->blk) {
484 break;
485 }
486 }
487 }
488
489 if (dev->unit >= MAX_FD) {
490 error_setg(errp, "Can't create floppy unit %d, bus supports "
491 "only %d units", dev->unit, MAX_FD);
492 return;
493 }
494
495 drive = get_drv(bus->fdc, dev->unit);
496 if (drive->blk) {
497 error_setg(errp, "Floppy unit %d is in use", dev->unit);
498 return;
499 }
500
501 if (!dev->conf.blk) {
502 dev->conf.blk = blk_create_empty_drive();
503 ret = blk_attach_dev(dev->conf.blk, qdev);
504 assert(ret == 0);
505
506 /* Don't take write permissions on an empty drive to allow attaching a
507 * read-only node later */
508 read_only = true;
509 } else {
510 read_only = !blk_bs(dev->conf.blk) ||
511 !blk_supports_write_perm(dev->conf.blk);
512 }
513
514 if (!blkconf_blocksizes(&dev->conf, errp)) {
515 return;
516 }
517
518 if (dev->conf.logical_block_size != 512 ||
519 dev->conf.physical_block_size != 512)
520 {
521 error_setg(errp, "Physical and logical block size must "
522 "be 512 for floppy");
523 return;
524 }
525
526 /* rerror/werror aren't supported by fdc and therefore not even registered
527 * with qdev. So set the defaults manually before they are used in
528 * blkconf_apply_backend_options(). */
529 dev->conf.rerror = BLOCKDEV_ON_ERROR_AUTO;
530 dev->conf.werror = BLOCKDEV_ON_ERROR_AUTO;
531
532 if (!blkconf_apply_backend_options(&dev->conf, read_only, false, errp)) {
533 return;
534 }
535
536 /* 'enospc' is the default for -drive, 'report' is what blk_new() gives us
537 * for empty drives. */
538 if (blk_get_on_error(dev->conf.blk, 0) != BLOCKDEV_ON_ERROR_ENOSPC &&
539 blk_get_on_error(dev->conf.blk, 0) != BLOCKDEV_ON_ERROR_REPORT) {
540 error_setg(errp, "fdc doesn't support drive option werror");
541 return;
542 }
543 if (blk_get_on_error(dev->conf.blk, 1) != BLOCKDEV_ON_ERROR_REPORT) {
544 error_setg(errp, "fdc doesn't support drive option rerror");
545 return;
546 }
547
548 drive->conf = &dev->conf;
549 drive->blk = dev->conf.blk;
550 drive->fdctrl = bus->fdc;
551
552 fd_init(drive);
553 blk_set_dev_ops(drive->blk, &fd_block_ops, drive);
554
555 /* Keep 'type' qdev property and FDrive->drive in sync */
556 drive->drive = dev->type;
557 pick_drive_type(drive);
558 dev->type = drive->drive;
559
560 fd_revalidate(drive);
561 }
562
563 static void floppy_drive_class_init(ObjectClass *klass, const void *data)
564 {
565 DeviceClass *k = DEVICE_CLASS(klass);
566 k->realize = floppy_drive_realize;
567 set_bit(DEVICE_CATEGORY_STORAGE, k->categories);
568 k->bus_type = TYPE_FLOPPY_BUS;
569 device_class_set_props(k, floppy_drive_properties);
570 k->desc = "virtual floppy drive";
571 }
572
573 static const TypeInfo floppy_drive_info = {
574 .name = TYPE_FLOPPY_DRIVE,
575 .parent = TYPE_DEVICE,
576 .instance_size = sizeof(FloppyDrive),
577 .class_init = floppy_drive_class_init,
578 };
579
580 /********************************************************/
581 /* Intel 82078 floppy disk controller emulation */
582
583 static void fdctrl_to_command_phase(FDCtrl *fdctrl);
584 static void fdctrl_raise_irq(FDCtrl *fdctrl);
585 static FDrive *get_cur_drv(FDCtrl *fdctrl);
586
587 static uint32_t fdctrl_read_statusA(FDCtrl *fdctrl);
588 static uint32_t fdctrl_read_statusB(FDCtrl *fdctrl);
589 static uint32_t fdctrl_read_dor(FDCtrl *fdctrl);
590 static void fdctrl_write_dor(FDCtrl *fdctrl, uint32_t value);
591 static uint32_t fdctrl_read_tape(FDCtrl *fdctrl);
592 static void fdctrl_write_tape(FDCtrl *fdctrl, uint32_t value);
593 static uint32_t fdctrl_read_main_status(FDCtrl *fdctrl);
594 static void fdctrl_write_rate(FDCtrl *fdctrl, uint32_t value);
595 static uint32_t fdctrl_read_data(FDCtrl *fdctrl);
596 static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value);
597 static uint32_t fdctrl_read_dir(FDCtrl *fdctrl);
598 static void fdctrl_write_ccr(FDCtrl *fdctrl, uint32_t value);
599
600 enum {
601 FD_DIR_WRITE = 0,
602 FD_DIR_READ = 1,
603 FD_DIR_SCANE = 2,
604 FD_DIR_SCANL = 3,
605 FD_DIR_SCANH = 4,
606 FD_DIR_VERIFY = 5,
607 };
608
609 enum {
610 FD_STATE_MULTI = 0x01, /* multi track flag */
611 FD_STATE_FORMAT = 0x02, /* format flag */
612 };
613
614 enum {
615 FD_REG_SRA = 0x00,
616 FD_REG_SRB = 0x01,
617 FD_REG_DOR = 0x02,
618 FD_REG_TDR = 0x03,
619 FD_REG_MSR = 0x04,
620 FD_REG_DSR = 0x04,
621 FD_REG_FIFO = 0x05,
622 FD_REG_DIR = 0x07,
623 FD_REG_CCR = 0x07,
624 };
625
626 enum {
627 FD_CMD_READ_TRACK = 0x02,
628 FD_CMD_SPECIFY = 0x03,
629 FD_CMD_SENSE_DRIVE_STATUS = 0x04,
630 FD_CMD_WRITE = 0x05,
631 FD_CMD_READ = 0x06,
632 FD_CMD_RECALIBRATE = 0x07,
633 FD_CMD_SENSE_INTERRUPT_STATUS = 0x08,
634 FD_CMD_WRITE_DELETED = 0x09,
635 FD_CMD_READ_ID = 0x0a,
636 FD_CMD_READ_DELETED = 0x0c,
637 FD_CMD_FORMAT_TRACK = 0x0d,
638 FD_CMD_DUMPREG = 0x0e,
639 FD_CMD_SEEK = 0x0f,
640 FD_CMD_VERSION = 0x10,
641 FD_CMD_SCAN_EQUAL = 0x11,
642 FD_CMD_PERPENDICULAR_MODE = 0x12,
643 FD_CMD_CONFIGURE = 0x13,
644 FD_CMD_LOCK = 0x14,
645 FD_CMD_VERIFY = 0x16,
646 FD_CMD_POWERDOWN_MODE = 0x17,
647 FD_CMD_PART_ID = 0x18,
648 FD_CMD_SCAN_LOW_OR_EQUAL = 0x19,
649 FD_CMD_SCAN_HIGH_OR_EQUAL = 0x1d,
650 FD_CMD_SAVE = 0x2e,
651 FD_CMD_OPTION = 0x33,
652 FD_CMD_RESTORE = 0x4e,
653 FD_CMD_DRIVE_SPECIFICATION_COMMAND = 0x8e,
654 FD_CMD_RELATIVE_SEEK_OUT = 0x8f,
655 FD_CMD_FORMAT_AND_WRITE = 0xcd,
656 FD_CMD_RELATIVE_SEEK_IN = 0xcf,
657 };
658
659 enum {
660 FD_CONFIG_PRETRK = 0xff, /* Pre-compensation set to track 0 */
661 FD_CONFIG_FIFOTHR = 0x0f, /* FIFO threshold set to 1 byte */
662 FD_CONFIG_POLL = 0x10, /* Poll enabled */
663 FD_CONFIG_EFIFO = 0x20, /* FIFO disabled */
664 FD_CONFIG_EIS = 0x40, /* No implied seeks */
665 };
666
667 enum {
668 FD_SR0_DS0 = 0x01,
669 FD_SR0_DS1 = 0x02,
670 FD_SR0_HEAD = 0x04,
671 FD_SR0_EQPMT = 0x10,
672 FD_SR0_SEEK = 0x20,
673 FD_SR0_ABNTERM = 0x40,
674 FD_SR0_INVCMD = 0x80,
675 FD_SR0_RDYCHG = 0xc0,
676 };
677
678 enum {
679 FD_SR1_MA = 0x01, /* Missing address mark */
680 FD_SR1_NW = 0x02, /* Not writable */
681 FD_SR1_EC = 0x80, /* End of cylinder */
682 };
683
684 enum {
685 FD_SR2_SNS = 0x04, /* Scan not satisfied */
686 FD_SR2_SEH = 0x08, /* Scan equal hit */
687 };
688
689 enum {
690 FD_SRA_DIR = 0x01,
691 FD_SRA_nWP = 0x02,
692 FD_SRA_nINDX = 0x04,
693 FD_SRA_HDSEL = 0x08,
694 FD_SRA_nTRK0 = 0x10,
695 FD_SRA_STEP = 0x20,
696 FD_SRA_nDRV2 = 0x40,
697 FD_SRA_INTPEND = 0x80,
698 };
699
700 enum {
701 FD_SRB_MTR0 = 0x01,
702 FD_SRB_MTR1 = 0x02,
703 FD_SRB_WGATE = 0x04,
704 FD_SRB_RDATA = 0x08,
705 FD_SRB_WDATA = 0x10,
706 FD_SRB_DR0 = 0x20,
707 };
708
709 enum {
710 #if MAX_FD == 4
711 FD_DOR_SELMASK = 0x03,
712 #else
713 FD_DOR_SELMASK = 0x01,
714 #endif
715 FD_DOR_nRESET = 0x04,
716 FD_DOR_DMAEN = 0x08,
717 FD_DOR_MOTEN0 = 0x10,
718 FD_DOR_MOTEN1 = 0x20,
719 FD_DOR_MOTEN2 = 0x40,
720 FD_DOR_MOTEN3 = 0x80,
721 };
722
723 enum {
724 #if MAX_FD == 4
725 FD_TDR_BOOTSEL = 0x0c,
726 #else
727 FD_TDR_BOOTSEL = 0x04,
728 #endif
729 };
730
731 enum {
732 FD_DSR_DRATEMASK= 0x03,
733 FD_DSR_PWRDOWN = 0x40,
734 FD_DSR_SWRESET = 0x80,
735 };
736
737 enum {
738 FD_MSR_DRV0BUSY = 0x01,
739 FD_MSR_DRV1BUSY = 0x02,
740 FD_MSR_DRV2BUSY = 0x04,
741 FD_MSR_DRV3BUSY = 0x08,
742 FD_MSR_CMDBUSY = 0x10,
743 FD_MSR_NONDMA = 0x20,
744 FD_MSR_DIO = 0x40,
745 FD_MSR_RQM = 0x80,
746 };
747
748 enum {
749 FD_DIR_DSKCHG = 0x80,
750 };
751
752 /*
753 * See chapter 5.0 "Controller phases" of the spec:
754 *
755 * Command phase:
756 * The host writes a command and its parameters into the FIFO. The command
757 * phase is completed when all parameters for the command have been supplied,
758 * and execution phase is entered.
759 *
760 * Execution phase:
761 * Data transfers, either DMA or non-DMA. For non-DMA transfers, the FIFO
762 * contains the payload now, otherwise it's unused. When all bytes of the
763 * required data have been transferred, the state is switched to either result
764 * phase (if the command produces status bytes) or directly back into the
765 * command phase for the next command.
766 *
767 * Result phase:
768 * The host reads out the FIFO, which contains one or more result bytes now.
769 */
770 enum {
771 /* Only for migration: reconstruct phase from registers like qemu 2.3 */
772 FD_PHASE_RECONSTRUCT = 0,
773
774 FD_PHASE_COMMAND = 1,
775 FD_PHASE_EXECUTION = 2,
776 FD_PHASE_RESULT = 3,
777 };
778
779 #define FD_MULTI_TRACK(state) ((state) & FD_STATE_MULTI)
780 #define FD_FORMAT_CMD(state) ((state) & FD_STATE_FORMAT)
781
782 static FloppyDriveType get_fallback_drive_type(FDrive *drv)
783 {
784 return drv->fdctrl->fallback;
785 }
786
787 uint32_t fdctrl_read(void *opaque, uint32_t reg)
788 {
789 FDCtrl *fdctrl = opaque;
790 uint32_t retval;
791
792 reg &= 7;
793 switch (reg) {
794 case FD_REG_SRA:
795 retval = fdctrl_read_statusA(fdctrl);
796 break;
797 case FD_REG_SRB:
798 retval = fdctrl_read_statusB(fdctrl);
799 break;
800 case FD_REG_DOR:
801 retval = fdctrl_read_dor(fdctrl);
802 break;
803 case FD_REG_TDR:
804 retval = fdctrl_read_tape(fdctrl);
805 break;
806 case FD_REG_MSR:
807 retval = fdctrl_read_main_status(fdctrl);
808 break;
809 case FD_REG_FIFO:
810 retval = fdctrl_read_data(fdctrl);
811 break;
812 case FD_REG_DIR:
813 retval = fdctrl_read_dir(fdctrl);
814 break;
815 default:
816 retval = (uint32_t)(-1);
817 break;
818 }
819 trace_fdc_ioport_read(reg, retval);
820
821 return retval;
822 }
823
824 void fdctrl_write(void *opaque, uint32_t reg, uint32_t value)
825 {
826 FDCtrl *fdctrl = opaque;
827
828 reg &= 7;
829 trace_fdc_ioport_write(reg, value);
830 switch (reg) {
831 case FD_REG_DOR:
832 fdctrl_write_dor(fdctrl, value);
833 break;
834 case FD_REG_TDR:
835 fdctrl_write_tape(fdctrl, value);
836 break;
837 case FD_REG_DSR:
838 fdctrl_write_rate(fdctrl, value);
839 break;
840 case FD_REG_FIFO:
841 fdctrl_write_data(fdctrl, value);
842 break;
843 case FD_REG_CCR:
844 fdctrl_write_ccr(fdctrl, value);
845 break;
846 default:
847 break;
848 }
849 }
850
851 static bool fdrive_media_changed_needed(void *opaque)
852 {
853 FDrive *drive = opaque;
854
855 return (drive->blk != NULL && drive->media_changed != 1);
856 }
857
858 static const VMStateDescription vmstate_fdrive_media_changed = {
859 .name = "fdrive/media_changed",
860 .version_id = 1,
861 .minimum_version_id = 1,
862 .needed = fdrive_media_changed_needed,
863 .fields = (const VMStateField[]) {
864 VMSTATE_UINT8(media_changed, FDrive),
865 VMSTATE_END_OF_LIST()
866 }
867 };
868
869 static const VMStateDescription vmstate_fdrive_media_rate = {
870 .name = "fdrive/media_rate",
871 .version_id = 1,
872 .minimum_version_id = 1,
873 .fields = (const VMStateField[]) {
874 VMSTATE_UINT8(media_rate, FDrive),
875 VMSTATE_END_OF_LIST()
876 }
877 };
878
879 static bool fdrive_perpendicular_needed(void *opaque)
880 {
881 FDrive *drive = opaque;
882
883 return drive->perpendicular != 0;
884 }
885
886 static const VMStateDescription vmstate_fdrive_perpendicular = {
887 .name = "fdrive/perpendicular",
888 .version_id = 1,
889 .minimum_version_id = 1,
890 .needed = fdrive_perpendicular_needed,
891 .fields = (const VMStateField[]) {
892 VMSTATE_UINT8(perpendicular, FDrive),
893 VMSTATE_END_OF_LIST()
894 }
895 };
896
897 static int fdrive_post_load(void *opaque, int version_id)
898 {
899 fd_revalidate(opaque);
900 return 0;
901 }
902
903 static const VMStateDescription vmstate_fdrive = {
904 .name = "fdrive",
905 .version_id = 1,
906 .minimum_version_id = 1,
907 .post_load = fdrive_post_load,
908 .fields = (const VMStateField[]) {
909 VMSTATE_UINT8(head, FDrive),
910 VMSTATE_UINT8(track, FDrive),
911 VMSTATE_UINT8(sect, FDrive),
912 VMSTATE_END_OF_LIST()
913 },
914 .subsections = (const VMStateDescription * const []) {
915 &vmstate_fdrive_media_changed,
916 &vmstate_fdrive_media_rate,
917 &vmstate_fdrive_perpendicular,
918 NULL
919 }
920 };
921
922 /*
923 * Reconstructs the phase from register values according to the logic that was
924 * implemented in qemu 2.3. This is the default value that is used if the phase
925 * subsection is not present on migration.
926 *
927 * Don't change this function to reflect newer qemu versions, it is part of
928 * the migration ABI.
929 */
930 static int reconstruct_phase(FDCtrl *fdctrl)
931 {
932 if (fdctrl->msr & FD_MSR_NONDMA) {
933 return FD_PHASE_EXECUTION;
934 } else if ((fdctrl->msr & FD_MSR_RQM) == 0) {
935 /* qemu 2.3 disabled RQM only during DMA transfers */
936 return FD_PHASE_EXECUTION;
937 } else if (fdctrl->msr & FD_MSR_DIO) {
938 return FD_PHASE_RESULT;
939 } else {
940 return FD_PHASE_COMMAND;
941 }
942 }
943
944 static int fdc_pre_save(void *opaque)
945 {
946 FDCtrl *s = opaque;
947
948 s->dor_vmstate = s->dor | GET_CUR_DRV(s);
949
950 return 0;
951 }
952
953 static int fdc_pre_load(void *opaque)
954 {
955 FDCtrl *s = opaque;
956 s->phase = FD_PHASE_RECONSTRUCT;
957 return 0;
958 }
959
960 static int fdc_post_load(void *opaque, int version_id)
961 {
962 FDCtrl *s = opaque;
963
964 SET_CUR_DRV(s, s->dor_vmstate & FD_DOR_SELMASK);
965 s->dor = s->dor_vmstate & ~FD_DOR_SELMASK;
966
967 if (s->phase == FD_PHASE_RECONSTRUCT) {
968 s->phase = reconstruct_phase(s);
969 }
970
971 return 0;
972 }
973
974 static bool fdc_reset_sensei_needed(void *opaque)
975 {
976 FDCtrl *s = opaque;
977
978 return s->reset_sensei != 0;
979 }
980
981 static const VMStateDescription vmstate_fdc_reset_sensei = {
982 .name = "fdc/reset_sensei",
983 .version_id = 1,
984 .minimum_version_id = 1,
985 .needed = fdc_reset_sensei_needed,
986 .fields = (const VMStateField[]) {
987 VMSTATE_INT32(reset_sensei, FDCtrl),
988 VMSTATE_END_OF_LIST()
989 }
990 };
991
992 static bool fdc_result_timer_needed(void *opaque)
993 {
994 FDCtrl *s = opaque;
995
996 return timer_pending(s->result_timer);
997 }
998
999 static const VMStateDescription vmstate_fdc_result_timer = {
1000 .name = "fdc/result_timer",
1001 .version_id = 1,
1002 .minimum_version_id = 1,
1003 .needed = fdc_result_timer_needed,
1004 .fields = (const VMStateField[]) {
1005 VMSTATE_TIMER_PTR(result_timer, FDCtrl),
1006 VMSTATE_END_OF_LIST()
1007 }
1008 };
1009
1010 static bool fdc_phase_needed(void *opaque)
1011 {
1012 FDCtrl *fdctrl = opaque;
1013
1014 return reconstruct_phase(fdctrl) != fdctrl->phase;
1015 }
1016
1017 static const VMStateDescription vmstate_fdc_phase = {
1018 .name = "fdc/phase",
1019 .version_id = 1,
1020 .minimum_version_id = 1,
1021 .needed = fdc_phase_needed,
1022 .fields = (const VMStateField[]) {
1023 VMSTATE_UINT8(phase, FDCtrl),
1024 VMSTATE_END_OF_LIST()
1025 }
1026 };
1027
1028 const VMStateDescription vmstate_fdc = {
1029 .name = "fdc",
1030 .version_id = 2,
1031 .minimum_version_id = 2,
1032 .pre_save = fdc_pre_save,
1033 .pre_load = fdc_pre_load,
1034 .post_load = fdc_post_load,
1035 .fields = (const VMStateField[]) {
1036 /* Controller State */
1037 VMSTATE_UINT8(sra, FDCtrl),
1038 VMSTATE_UINT8(srb, FDCtrl),
1039 VMSTATE_UINT8(dor_vmstate, FDCtrl),
1040 VMSTATE_UINT8(tdr, FDCtrl),
1041 VMSTATE_UINT8(dsr, FDCtrl),
1042 VMSTATE_UINT8(msr, FDCtrl),
1043 VMSTATE_UINT8(status0, FDCtrl),
1044 VMSTATE_UINT8(status1, FDCtrl),
1045 VMSTATE_UINT8(status2, FDCtrl),
1046 /* Command FIFO */
1047 VMSTATE_VARRAY_INT32(fifo, FDCtrl, fifo_size, 0, vmstate_info_uint8,
1048 uint8_t),
1049 VMSTATE_UINT32(data_pos, FDCtrl),
1050 VMSTATE_UINT32(data_len, FDCtrl),
1051 VMSTATE_UINT8(data_state, FDCtrl),
1052 VMSTATE_UINT8(data_dir, FDCtrl),
1053 VMSTATE_UINT8(eot, FDCtrl),
1054 /* States kept only to be returned back */
1055 VMSTATE_UINT8(timer0, FDCtrl),
1056 VMSTATE_UINT8(timer1, FDCtrl),
1057 VMSTATE_UINT8(precomp_trk, FDCtrl),
1058 VMSTATE_UINT8(config, FDCtrl),
1059 VMSTATE_UINT8(lock, FDCtrl),
1060 VMSTATE_UINT8(pwrd, FDCtrl),
1061 VMSTATE_UINT8_EQUAL(num_floppies, FDCtrl),
1062 VMSTATE_STRUCT_ARRAY(drives, FDCtrl, MAX_FD, 1,
1063 vmstate_fdrive, FDrive),
1064 VMSTATE_END_OF_LIST()
1065 },
1066 .subsections = (const VMStateDescription * const []) {
1067 &vmstate_fdc_reset_sensei,
1068 &vmstate_fdc_result_timer,
1069 &vmstate_fdc_phase,
1070 NULL
1071 }
1072 };
1073
1074 /* Change IRQ state */
1075 static void fdctrl_reset_irq(FDCtrl *fdctrl)
1076 {
1077 fdctrl->status0 = 0;
1078 if (!(fdctrl->sra & FD_SRA_INTPEND))
1079 return;
1080 FLOPPY_DPRINTF("Reset interrupt\n");
1081 qemu_set_irq(fdctrl->irq, 0);
1082 fdctrl->sra &= ~FD_SRA_INTPEND;
1083 }
1084
1085 static void fdctrl_raise_irq(FDCtrl *fdctrl)
1086 {
1087 if (!(fdctrl->sra & FD_SRA_INTPEND)) {
1088 qemu_set_irq(fdctrl->irq, 1);
1089 fdctrl->sra |= FD_SRA_INTPEND;
1090 }
1091
1092 fdctrl->reset_sensei = 0;
1093 FLOPPY_DPRINTF("Set interrupt status to 0x%02x\n", fdctrl->status0);
1094 }
1095
1096 /* Reset controller */
1097 void fdctrl_reset(FDCtrl *fdctrl, int do_irq)
1098 {
1099 int i;
1100
1101 FLOPPY_DPRINTF("reset controller\n");
1102 fdctrl_reset_irq(fdctrl);
1103 /* Initialise controller */
1104 fdctrl->sra = 0;
1105 fdctrl->srb = 0xc0;
1106 if (!fdctrl->drives[1].blk) {
1107 fdctrl->sra |= FD_SRA_nDRV2;
1108 }
1109 fdctrl->cur_drv = 0;
1110 fdctrl->dor = FD_DOR_nRESET;
1111 fdctrl->dor |= (fdctrl->dma_chann != -1) ? FD_DOR_DMAEN : 0;
1112 fdctrl->msr = FD_MSR_RQM;
1113 fdctrl->reset_sensei = 0;
1114 timer_del(fdctrl->result_timer);
1115 /* FIFO state */
1116 fdctrl->data_pos = 0;
1117 fdctrl->data_len = 0;
1118 fdctrl->data_state = 0;
1119 fdctrl->data_dir = FD_DIR_WRITE;
1120 for (i = 0; i < MAX_FD; i++)
1121 fd_recalibrate(&fdctrl->drives[i]);
1122 fdctrl_to_command_phase(fdctrl);
1123 if (do_irq) {
1124 fdctrl->status0 |= FD_SR0_RDYCHG;
1125 fdctrl_raise_irq(fdctrl);
1126 fdctrl->reset_sensei = FD_RESET_SENSEI_COUNT;
1127 }
1128 }
1129
1130 static inline FDrive *drv0(FDCtrl *fdctrl)
1131 {
1132 return &fdctrl->drives[(fdctrl->tdr & FD_TDR_BOOTSEL) >> 2];
1133 }
1134
1135 static inline FDrive *drv1(FDCtrl *fdctrl)
1136 {
1137 if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (1 << 2))
1138 return &fdctrl->drives[1];
1139 else
1140 return &fdctrl->drives[0];
1141 }
1142
1143 #if MAX_FD == 4
1144 static inline FDrive *drv2(FDCtrl *fdctrl)
1145 {
1146 if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (2 << 2))
1147 return &fdctrl->drives[2];
1148 else
1149 return &fdctrl->drives[1];
1150 }
1151
1152 static inline FDrive *drv3(FDCtrl *fdctrl)
1153 {
1154 if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (3 << 2))
1155 return &fdctrl->drives[3];
1156 else
1157 return &fdctrl->drives[2];
1158 }
1159 #endif
1160
1161 static FDrive *get_drv(FDCtrl *fdctrl, int unit)
1162 {
1163 switch (unit) {
1164 case 0: return drv0(fdctrl);
1165 case 1: return drv1(fdctrl);
1166 #if MAX_FD == 4
1167 case 2: return drv2(fdctrl);
1168 case 3: return drv3(fdctrl);
1169 #endif
1170 default: return NULL;
1171 }
1172 }
1173
1174 static FDrive *get_cur_drv(FDCtrl *fdctrl)
1175 {
1176 FDrive *cur_drv = get_drv(fdctrl, fdctrl->cur_drv);
1177
1178 if (!cur_drv->blk) {
1179 /*
1180 * Kludge: empty drive line selected. Create an anonymous
1181 * BlockBackend to avoid NULL deref with various BlockBackend
1182 * API calls within this model (CVE-2021-20196).
1183 * Due to the controller QOM model limitations, we don't
1184 * attach the created to the controller device.
1185 */
1186 cur_drv->blk = blk_create_empty_drive();
1187 }
1188 return cur_drv;
1189 }
1190
1191 /* Status A register : 0x00 (read-only) */
1192 static uint32_t fdctrl_read_statusA(FDCtrl *fdctrl)
1193 {
1194 uint32_t retval = fdctrl->sra;
1195
1196 FLOPPY_DPRINTF("status register A: 0x%02x\n", retval);
1197
1198 return retval;
1199 }
1200
1201 /* Status B register : 0x01 (read-only) */
1202 static uint32_t fdctrl_read_statusB(FDCtrl *fdctrl)
1203 {
1204 uint32_t retval = fdctrl->srb;
1205
1206 FLOPPY_DPRINTF("status register B: 0x%02x\n", retval);
1207
1208 return retval;
1209 }
1210
1211 /* Digital output register : 0x02 */
1212 static uint32_t fdctrl_read_dor(FDCtrl *fdctrl)
1213 {
1214 uint32_t retval = fdctrl->dor;
1215
1216 /* Selected drive */
1217 retval |= fdctrl->cur_drv;
1218 FLOPPY_DPRINTF("digital output register: 0x%02x\n", retval);
1219
1220 return retval;
1221 }
1222
1223 static void fdctrl_write_dor(FDCtrl *fdctrl, uint32_t value)
1224 {
1225 FLOPPY_DPRINTF("digital output register set to 0x%02x\n", value);
1226
1227 /* Motors */
1228 if (value & FD_DOR_MOTEN0)
1229 fdctrl->srb |= FD_SRB_MTR0;
1230 else
1231 fdctrl->srb &= ~FD_SRB_MTR0;
1232 if (value & FD_DOR_MOTEN1)
1233 fdctrl->srb |= FD_SRB_MTR1;
1234 else
1235 fdctrl->srb &= ~FD_SRB_MTR1;
1236
1237 /* Drive */
1238 if (value & 1)
1239 fdctrl->srb |= FD_SRB_DR0;
1240 else
1241 fdctrl->srb &= ~FD_SRB_DR0;
1242
1243 /* Reset */
1244 if (!(value & FD_DOR_nRESET)) {
1245 if (fdctrl->dor & FD_DOR_nRESET) {
1246 FLOPPY_DPRINTF("controller enter RESET state\n");
1247 }
1248 } else {
1249 if (!(fdctrl->dor & FD_DOR_nRESET)) {
1250 FLOPPY_DPRINTF("controller out of RESET state\n");
1251 fdctrl_reset(fdctrl, 1);
1252 fdctrl->dsr &= ~FD_DSR_PWRDOWN;
1253 }
1254 }
1255 /* Selected drive */
1256 fdctrl->cur_drv = value & FD_DOR_SELMASK;
1257
1258 fdctrl->dor = value;
1259 }
1260
1261 /* Tape drive register : 0x03 */
1262 static uint32_t fdctrl_read_tape(FDCtrl *fdctrl)
1263 {
1264 uint32_t retval = fdctrl->tdr;
1265
1266 FLOPPY_DPRINTF("tape drive register: 0x%02x\n", retval);
1267
1268 return retval;
1269 }
1270
1271 static void fdctrl_write_tape(FDCtrl *fdctrl, uint32_t value)
1272 {
1273 /* Reset mode */
1274 if (!(fdctrl->dor & FD_DOR_nRESET)) {
1275 FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
1276 return;
1277 }
1278 FLOPPY_DPRINTF("tape drive register set to 0x%02x\n", value);
1279 /* Disk boot selection indicator */
1280 fdctrl->tdr = value & FD_TDR_BOOTSEL;
1281 /* Tape indicators: never allow */
1282 }
1283
1284 /* Main status register : 0x04 (read) */
1285 static uint32_t fdctrl_read_main_status(FDCtrl *fdctrl)
1286 {
1287 uint32_t retval = fdctrl->msr;
1288
1289 fdctrl->dsr &= ~FD_DSR_PWRDOWN;
1290 fdctrl->dor |= FD_DOR_nRESET;
1291
1292 FLOPPY_DPRINTF("main status register: 0x%02x\n", retval);
1293
1294 return retval;
1295 }
1296
1297 /* Data select rate register : 0x04 (write) */
1298 static void fdctrl_write_rate(FDCtrl *fdctrl, uint32_t value)
1299 {
1300 /* Reset mode */
1301 if (!(fdctrl->dor & FD_DOR_nRESET)) {
1302 FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
1303 return;
1304 }
1305 FLOPPY_DPRINTF("select rate register set to 0x%02x\n", value);
1306 /* Reset: autoclear */
1307 if (value & FD_DSR_SWRESET) {
1308 fdctrl->dor &= ~FD_DOR_nRESET;
1309 fdctrl_reset(fdctrl, 1);
1310 fdctrl->dor |= FD_DOR_nRESET;
1311 }
1312 if (value & FD_DSR_PWRDOWN) {
1313 fdctrl_reset(fdctrl, 1);
1314 }
1315 fdctrl->dsr = value;
1316 }
1317
1318 /* Configuration control register: 0x07 (write) */
1319 static void fdctrl_write_ccr(FDCtrl *fdctrl, uint32_t value)
1320 {
1321 /* Reset mode */
1322 if (!(fdctrl->dor & FD_DOR_nRESET)) {
1323 FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
1324 return;
1325 }
1326 FLOPPY_DPRINTF("configuration control register set to 0x%02x\n", value);
1327
1328 /* Only the rate selection bits used in AT mode, and we
1329 * store those in the DSR.
1330 */
1331 fdctrl->dsr = (fdctrl->dsr & ~FD_DSR_DRATEMASK) |
1332 (value & FD_DSR_DRATEMASK);
1333 }
1334
1335 static int fdctrl_media_changed(FDrive *drv)
1336 {
1337 return drv->media_changed;
1338 }
1339
1340 /* Digital input register : 0x07 (read-only) */
1341 static uint32_t fdctrl_read_dir(FDCtrl *fdctrl)
1342 {
1343 uint32_t retval = 0;
1344
1345 if (fdctrl_media_changed(get_cur_drv(fdctrl))) {
1346 retval |= FD_DIR_DSKCHG;
1347 }
1348 if (retval != 0) {
1349 FLOPPY_DPRINTF("Floppy digital input register: 0x%02x\n", retval);
1350 }
1351
1352 return retval;
1353 }
1354
1355 /* Clear the FIFO and update the state for receiving the next command */
1356 static void fdctrl_to_command_phase(FDCtrl *fdctrl)
1357 {
1358 fdctrl->phase = FD_PHASE_COMMAND;
1359 fdctrl->data_dir = FD_DIR_WRITE;
1360 fdctrl->data_pos = 0;
1361 fdctrl->data_len = 1; /* Accept command byte, adjust for params later */
1362 fdctrl->msr &= ~(FD_MSR_CMDBUSY | FD_MSR_DIO);
1363 fdctrl->msr |= FD_MSR_RQM;
1364 }
1365
1366 /* Update the state to allow the guest to read out the command status.
1367 * @fifo_len is the number of result bytes to be read out. */
1368 static void fdctrl_to_result_phase(FDCtrl *fdctrl, int fifo_len)
1369 {
1370 fdctrl->phase = FD_PHASE_RESULT;
1371 fdctrl->data_dir = FD_DIR_READ;
1372 fdctrl->data_len = fifo_len;
1373 fdctrl->data_pos = 0;
1374 fdctrl->msr |= FD_MSR_CMDBUSY | FD_MSR_RQM | FD_MSR_DIO;
1375 }
1376
1377 /* Set an error: unimplemented/unknown command */
1378 static void fdctrl_unimplemented(FDCtrl *fdctrl, int direction)
1379 {
1380 qemu_log_mask(LOG_UNIMP, "fdc: unimplemented command 0x%02x\n",
1381 fdctrl->fifo[0]);
1382 fdctrl->fifo[0] = FD_SR0_INVCMD;
1383 fdctrl_to_result_phase(fdctrl, 1);
1384 }
1385
1386 /* Seek to next sector
1387 * returns 0 when end of track reached (for DBL_SIDES on head 1)
1388 * otherwise returns 1
1389 */
1390 static int fdctrl_seek_to_next_sect(FDCtrl *fdctrl, FDrive *cur_drv)
1391 {
1392 FLOPPY_DPRINTF("seek to next sector (%d %02x %02x => %d)\n",
1393 cur_drv->head, cur_drv->track, cur_drv->sect,
1394 fd_sector(cur_drv));
1395 /* XXX: cur_drv->sect >= cur_drv->last_sect should be an
1396 error in fact */
1397 uint8_t new_head = cur_drv->head;
1398 uint8_t new_track = cur_drv->track;
1399 uint8_t new_sect = cur_drv->sect;
1400
1401 int ret = 1;
1402
1403 if (new_sect >= cur_drv->last_sect ||
1404 new_sect == fdctrl->eot) {
1405 new_sect = 1;
1406 if (FD_MULTI_TRACK(fdctrl->data_state)) {
1407 if (new_head == 0 &&
1408 (cur_drv->flags & FDISK_DBL_SIDES) != 0) {
1409 new_head = 1;
1410 } else {
1411 new_head = 0;
1412 new_track++;
1413 fdctrl->status0 |= FD_SR0_SEEK;
1414 if ((cur_drv->flags & FDISK_DBL_SIDES) == 0) {
1415 ret = 0;
1416 }
1417 }
1418 } else {
1419 fdctrl->status0 |= FD_SR0_SEEK;
1420 new_track++;
1421 ret = 0;
1422 }
1423 if (ret == 1) {
1424 FLOPPY_DPRINTF("seek to next track (%d %02x %02x => %d)\n",
1425 new_head, new_track, new_sect, fd_sector(cur_drv));
1426 }
1427 } else {
1428 new_sect++;
1429 }
1430 fd_seek(cur_drv, new_head, new_track, new_sect, 1);
1431 return ret;
1432 }
1433
1434 /* Callback for transfer end (stop or abort) */
1435 static void fdctrl_stop_transfer(FDCtrl *fdctrl, uint8_t status0,
1436 uint8_t status1, uint8_t status2)
1437 {
1438 FDrive *cur_drv;
1439 cur_drv = get_cur_drv(fdctrl);
1440
1441 fdctrl->status0 &= ~(FD_SR0_DS0 | FD_SR0_DS1 | FD_SR0_HEAD);
1442 fdctrl->status0 |= GET_CUR_DRV(fdctrl);
1443 if (cur_drv->head) {
1444 fdctrl->status0 |= FD_SR0_HEAD;
1445 }
1446 fdctrl->status0 |= status0;
1447
1448 FLOPPY_DPRINTF("transfer status: %02x %02x %02x (%02x)\n",
1449 status0, status1, status2, fdctrl->status0);
1450 fdctrl->fifo[0] = fdctrl->status0;
1451 fdctrl->fifo[1] = status1;
1452 fdctrl->fifo[2] = status2;
1453 fdctrl->fifo[3] = cur_drv->track;
1454 fdctrl->fifo[4] = cur_drv->head;
1455 fdctrl->fifo[5] = cur_drv->sect;
1456 fdctrl->fifo[6] = FD_SECTOR_SC;
1457 fdctrl->data_dir = FD_DIR_READ;
1458 if (fdctrl->dma_chann != -1 && !(fdctrl->msr & FD_MSR_NONDMA)) {
1459 IsaDmaClass *k = ISADMA_GET_CLASS(fdctrl->dma);
1460 k->release_DREQ(fdctrl->dma, fdctrl->dma_chann);
1461 }
1462 fdctrl->msr |= FD_MSR_RQM | FD_MSR_DIO;
1463 fdctrl->msr &= ~FD_MSR_NONDMA;
1464
1465 fdctrl_to_result_phase(fdctrl, 7);
1466 fdctrl_raise_irq(fdctrl);
1467 }
1468
1469 /* Prepare a data transfer (either DMA or FIFO) */
1470 static void fdctrl_start_transfer(FDCtrl *fdctrl, int direction)
1471 {
1472 FDrive *cur_drv;
1473 uint8_t kh, kt, ks;
1474
1475 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1476 cur_drv = get_cur_drv(fdctrl);
1477 kt = fdctrl->fifo[2];
1478 kh = fdctrl->fifo[3];
1479 ks = fdctrl->fifo[4];
1480 FLOPPY_DPRINTF("Start transfer at %d %d %02x %02x (%d)\n",
1481 GET_CUR_DRV(fdctrl), kh, kt, ks,
1482 fd_sector_calc(kh, kt, ks, cur_drv->last_sect,
1483 NUM_SIDES(cur_drv)));
1484 switch (fd_seek(cur_drv, kh, kt, ks, fdctrl->config & FD_CONFIG_EIS)) {
1485 case 2:
1486 /* track/head out of range */
1487 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1488 fdctrl->fifo[3] = kt;
1489 fdctrl->fifo[4] = kh;
1490 fdctrl->fifo[5] = ks;
1491 return;
1492 case 5:
1493 /*
1494 * No medium: there is no address mark to be found. Guests that tell
1495 * an absent diskette from an unreadable one rely on ST1.MA.
1496 */
1497 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_MA, 0x00);
1498 fdctrl->fifo[3] = kt;
1499 fdctrl->fifo[4] = kh;
1500 fdctrl->fifo[5] = ks;
1501 return;
1502 case 3:
1503 /* sector too big */
1504 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_EC, 0x00);
1505 fdctrl->fifo[3] = kt;
1506 fdctrl->fifo[4] = kh;
1507 fdctrl->fifo[5] = ks;
1508 return;
1509 case 4:
1510 /* No seek enabled */
1511 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1512 fdctrl->fifo[3] = kt;
1513 fdctrl->fifo[4] = kh;
1514 fdctrl->fifo[5] = ks;
1515 return;
1516 case 1:
1517 fdctrl->status0 |= FD_SR0_SEEK;
1518 break;
1519 default:
1520 break;
1521 }
1522
1523 /* Check the data rate. If the programmed data rate does not match
1524 * the currently inserted medium, the operation has to fail. */
1525 if ((fdctrl->dsr & FD_DSR_DRATEMASK) != cur_drv->media_rate) {
1526 FLOPPY_DPRINTF("data rate mismatch (fdc=%d, media=%d)\n",
1527 fdctrl->dsr & FD_DSR_DRATEMASK, cur_drv->media_rate);
1528 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_MA, 0x00);
1529 fdctrl->fifo[3] = kt;
1530 fdctrl->fifo[4] = kh;
1531 fdctrl->fifo[5] = ks;
1532 return;
1533 }
1534
1535 /* Set the FIFO state */
1536 fdctrl->data_dir = direction;
1537 fdctrl->data_pos = 0;
1538 assert(fdctrl->msr & FD_MSR_CMDBUSY);
1539 if (fdctrl->fifo[0] & 0x80)
1540 fdctrl->data_state |= FD_STATE_MULTI;
1541 else
1542 fdctrl->data_state &= ~FD_STATE_MULTI;
1543 if (fdctrl->fifo[5] == 0) {
1544 fdctrl->data_len = fdctrl->fifo[8];
1545 } else {
1546 int tmp;
1547 fdctrl->data_len = 128 << (fdctrl->fifo[5] > 7 ? 7 : fdctrl->fifo[5]);
1548 tmp = (fdctrl->fifo[6] - ks + 1);
1549 if (tmp < 0) {
1550 FLOPPY_DPRINTF("invalid EOT: %d\n", tmp);
1551 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_MA, 0x00);
1552 fdctrl->fifo[3] = kt;
1553 fdctrl->fifo[4] = kh;
1554 fdctrl->fifo[5] = ks;
1555 return;
1556 }
1557 if (fdctrl->fifo[0] & 0x80)
1558 tmp += fdctrl->fifo[6];
1559 fdctrl->data_len *= tmp;
1560 }
1561 fdctrl->eot = fdctrl->fifo[6];
1562 if (fdctrl->dor & FD_DOR_DMAEN) {
1563 /* DMA transfer is enabled. */
1564 IsaDmaClass *k = ISADMA_GET_CLASS(fdctrl->dma);
1565
1566 FLOPPY_DPRINTF("direction=%d (%d - %d)\n",
1567 direction, (128 << fdctrl->fifo[5]) *
1568 (cur_drv->last_sect - ks + 1), fdctrl->data_len);
1569
1570 /* No access is allowed until DMA transfer has completed */
1571 fdctrl->msr &= ~FD_MSR_RQM;
1572 if (direction != FD_DIR_VERIFY) {
1573 /*
1574 * Now, we just have to wait for the DMA controller to
1575 * recall us...
1576 */
1577 k->hold_DREQ(fdctrl->dma, fdctrl->dma_chann);
1578 k->schedule(fdctrl->dma);
1579 } else {
1580 /* Start transfer */
1581 fdctrl_transfer_handler(fdctrl, fdctrl->dma_chann, 0,
1582 fdctrl->data_len);
1583 }
1584 return;
1585 }
1586 FLOPPY_DPRINTF("start non-DMA transfer\n");
1587 fdctrl->msr |= FD_MSR_NONDMA | FD_MSR_RQM;
1588 if (direction != FD_DIR_WRITE)
1589 fdctrl->msr |= FD_MSR_DIO;
1590 /* IO based transfer: calculate len */
1591 fdctrl_raise_irq(fdctrl);
1592 }
1593
1594 /* Prepare a transfer of deleted data */
1595 static void fdctrl_start_transfer_del(FDCtrl *fdctrl, int direction)
1596 {
1597 qemu_log_mask(LOG_UNIMP, "fdctrl_start_transfer_del() unimplemented\n");
1598
1599 /* We don't handle deleted data,
1600 * so we don't return *ANYTHING*
1601 */
1602 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK, 0x00, 0x00);
1603 }
1604
1605 /* handlers for DMA transfers */
1606 int fdctrl_transfer_handler(void *opaque, int nchan, int dma_pos, int dma_len)
1607 {
1608 FDCtrl *fdctrl;
1609 FDrive *cur_drv;
1610 int len, start_pos, rel_pos;
1611 uint8_t status0 = 0x00, status1 = 0x00, status2 = 0x00;
1612 IsaDmaClass *k;
1613
1614 fdctrl = opaque;
1615 if (fdctrl->msr & FD_MSR_RQM) {
1616 FLOPPY_DPRINTF("Not in DMA transfer mode !\n");
1617 return 0;
1618 }
1619 k = ISADMA_GET_CLASS(fdctrl->dma);
1620 cur_drv = get_cur_drv(fdctrl);
1621 if (fdctrl->data_dir == FD_DIR_SCANE || fdctrl->data_dir == FD_DIR_SCANL ||
1622 fdctrl->data_dir == FD_DIR_SCANH)
1623 status2 = FD_SR2_SNS;
1624 if (dma_len > fdctrl->data_len)
1625 dma_len = fdctrl->data_len;
1626 if (cur_drv->blk == NULL) {
1627 if (fdctrl->data_dir == FD_DIR_WRITE)
1628 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK, 0x00, 0x00);
1629 else
1630 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1631 len = 0;
1632 goto transfer_error;
1633 }
1634 rel_pos = fdctrl->data_pos % FD_SECTOR_LEN;
1635 for (start_pos = fdctrl->data_pos; fdctrl->data_pos < dma_len;) {
1636 len = dma_len - fdctrl->data_pos;
1637 if (len + rel_pos > FD_SECTOR_LEN)
1638 len = FD_SECTOR_LEN - rel_pos;
1639 FLOPPY_DPRINTF("copy %d bytes (%d %d %d) %d pos %d %02x "
1640 "(%d-0x%08x 0x%08x)\n", len, dma_len, fdctrl->data_pos,
1641 fdctrl->data_len, GET_CUR_DRV(fdctrl), cur_drv->head,
1642 cur_drv->track, cur_drv->sect, fd_sector(cur_drv),
1643 fd_sector(cur_drv) * FD_SECTOR_LEN);
1644 if (fdctrl->data_dir != FD_DIR_WRITE ||
1645 len < FD_SECTOR_LEN || rel_pos != 0) {
1646 /* READ & SCAN commands and realign to a sector for WRITE */
1647 if (blk_pread(cur_drv->blk, fd_offset(cur_drv), BDRV_SECTOR_SIZE,
1648 fdctrl->fifo, 0) < 0) {
1649 FLOPPY_DPRINTF("Floppy: error getting sector %d\n",
1650 fd_sector(cur_drv));
1651 /* Sure, image size is too small... */
1652 memset(fdctrl->fifo, 0, FD_SECTOR_LEN);
1653 }
1654 }
1655 switch (fdctrl->data_dir) {
1656 case FD_DIR_READ:
1657 /* READ commands */
1658 k->write_memory(fdctrl->dma, nchan, fdctrl->fifo + rel_pos,
1659 fdctrl->data_pos, len);
1660 break;
1661 case FD_DIR_WRITE:
1662 /* WRITE commands */
1663 if (cur_drv->ro) {
1664 /* Handle readonly medium early, no need to do DMA, touch the
1665 * LED or attempt any writes. A real floppy doesn't attempt
1666 * to write to readonly media either. */
1667 fdctrl_stop_transfer(fdctrl,
1668 FD_SR0_ABNTERM | FD_SR0_SEEK, FD_SR1_NW,
1669 0x00);
1670 goto transfer_error;
1671 }
1672
1673 k->read_memory(fdctrl->dma, nchan, fdctrl->fifo + rel_pos,
1674 fdctrl->data_pos, len);
1675 if (blk_pwrite(cur_drv->blk, fd_offset(cur_drv), BDRV_SECTOR_SIZE,
1676 fdctrl->fifo, 0) < 0) {
1677 FLOPPY_DPRINTF("error writing sector %d\n",
1678 fd_sector(cur_drv));
1679 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK, 0x00, 0x00);
1680 goto transfer_error;
1681 }
1682 break;
1683 case FD_DIR_VERIFY:
1684 /* VERIFY commands */
1685 break;
1686 default:
1687 /* SCAN commands */
1688 {
1689 uint8_t tmpbuf[FD_SECTOR_LEN];
1690 int ret;
1691 k->read_memory(fdctrl->dma, nchan, tmpbuf, fdctrl->data_pos,
1692 len);
1693 ret = memcmp(tmpbuf, fdctrl->fifo + rel_pos, len);
1694 if (ret == 0) {
1695 status2 = FD_SR2_SEH;
1696 goto end_transfer;
1697 }
1698 if ((ret < 0 && fdctrl->data_dir == FD_DIR_SCANL) ||
1699 (ret > 0 && fdctrl->data_dir == FD_DIR_SCANH)) {
1700 status2 = 0x00;
1701 goto end_transfer;
1702 }
1703 }
1704 break;
1705 }
1706 fdctrl->data_pos += len;
1707 rel_pos = fdctrl->data_pos % FD_SECTOR_LEN;
1708 if (rel_pos == 0) {
1709 /* Seek to next sector */
1710 if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv))
1711 break;
1712 }
1713 }
1714 end_transfer:
1715 len = fdctrl->data_pos - start_pos;
1716 FLOPPY_DPRINTF("end transfer %d %d %d\n",
1717 fdctrl->data_pos, len, fdctrl->data_len);
1718 if (fdctrl->data_dir == FD_DIR_SCANE ||
1719 fdctrl->data_dir == FD_DIR_SCANL ||
1720 fdctrl->data_dir == FD_DIR_SCANH)
1721 status2 = FD_SR2_SEH;
1722 fdctrl->data_len -= len;
1723 fdctrl_stop_transfer(fdctrl, status0, status1, status2);
1724 transfer_error:
1725
1726 return len;
1727 }
1728
1729 /* Data register : 0x05 */
1730 static uint32_t fdctrl_read_data(FDCtrl *fdctrl)
1731 {
1732 FDrive *cur_drv;
1733 uint32_t retval = 0;
1734 uint32_t pos;
1735
1736 cur_drv = get_cur_drv(fdctrl);
1737 fdctrl->dsr &= ~FD_DSR_PWRDOWN;
1738 if (!(fdctrl->msr & FD_MSR_RQM) || !(fdctrl->msr & FD_MSR_DIO)) {
1739 FLOPPY_DPRINTF("error: controller not ready for reading\n");
1740 return 0;
1741 }
1742
1743 /* If data_len spans multiple sectors, the current position in the FIFO
1744 * wraps around while fdctrl->data_pos is the real position in the whole
1745 * request. */
1746 pos = fdctrl->data_pos;
1747 pos %= FD_SECTOR_LEN;
1748
1749 switch (fdctrl->phase) {
1750 case FD_PHASE_EXECUTION:
1751 assert(fdctrl->msr & FD_MSR_NONDMA);
1752 if (pos == 0) {
1753 if (fdctrl->data_pos != 0)
1754 if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv)) {
1755 FLOPPY_DPRINTF("error seeking to next sector %d\n",
1756 fd_sector(cur_drv));
1757 return 0;
1758 }
1759 if (blk_pread(cur_drv->blk, fd_offset(cur_drv), BDRV_SECTOR_SIZE,
1760 fdctrl->fifo, 0)
1761 < 0) {
1762 FLOPPY_DPRINTF("error getting sector %d\n",
1763 fd_sector(cur_drv));
1764 /* Sure, image size is too small... */
1765 memset(fdctrl->fifo, 0, FD_SECTOR_LEN);
1766 }
1767 }
1768
1769 if (++fdctrl->data_pos == fdctrl->data_len) {
1770 fdctrl->msr &= ~FD_MSR_RQM;
1771 fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00);
1772 }
1773 break;
1774
1775 case FD_PHASE_RESULT:
1776 assert(!(fdctrl->msr & FD_MSR_NONDMA));
1777 if (++fdctrl->data_pos == fdctrl->data_len) {
1778 fdctrl->msr &= ~FD_MSR_RQM;
1779 fdctrl_to_command_phase(fdctrl);
1780 fdctrl_reset_irq(fdctrl);
1781 }
1782 break;
1783
1784 case FD_PHASE_COMMAND:
1785 default:
1786 abort();
1787 }
1788
1789 retval = fdctrl->fifo[pos];
1790 FLOPPY_DPRINTF("data register: 0x%02x\n", retval);
1791
1792 return retval;
1793 }
1794
1795 static void fdctrl_format_sector(FDCtrl *fdctrl)
1796 {
1797 FDrive *cur_drv;
1798 uint8_t kh, kt, ks;
1799
1800 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1801 cur_drv = get_cur_drv(fdctrl);
1802 kt = fdctrl->fifo[6];
1803 kh = fdctrl->fifo[7];
1804 ks = fdctrl->fifo[8];
1805 FLOPPY_DPRINTF("format sector at %d %d %02x %02x (%d)\n",
1806 GET_CUR_DRV(fdctrl), kh, kt, ks,
1807 fd_sector_calc(kh, kt, ks, cur_drv->last_sect,
1808 NUM_SIDES(cur_drv)));
1809 switch (fd_seek(cur_drv, kh, kt, ks, fdctrl->config & FD_CONFIG_EIS)) {
1810 case 2:
1811 /* track/head out of range */
1812 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1813 fdctrl->fifo[3] = kt;
1814 fdctrl->fifo[4] = kh;
1815 fdctrl->fifo[5] = ks;
1816 return;
1817 case 5:
1818 /* no medium */
1819 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_MA, 0x00);
1820 fdctrl->fifo[3] = kt;
1821 fdctrl->fifo[4] = kh;
1822 fdctrl->fifo[5] = ks;
1823 return;
1824 case 3:
1825 /* sector too big */
1826 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_EC, 0x00);
1827 fdctrl->fifo[3] = kt;
1828 fdctrl->fifo[4] = kh;
1829 fdctrl->fifo[5] = ks;
1830 return;
1831 case 4:
1832 /* No seek enabled */
1833 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1834 fdctrl->fifo[3] = kt;
1835 fdctrl->fifo[4] = kh;
1836 fdctrl->fifo[5] = ks;
1837 return;
1838 case 1:
1839 fdctrl->status0 |= FD_SR0_SEEK;
1840 break;
1841 default:
1842 break;
1843 }
1844 memset(fdctrl->fifo, 0, FD_SECTOR_LEN);
1845 if (cur_drv->blk == NULL ||
1846 blk_pwrite(cur_drv->blk, fd_offset(cur_drv), BDRV_SECTOR_SIZE,
1847 fdctrl->fifo, 0) < 0) {
1848 FLOPPY_DPRINTF("error formatting sector %d\n", fd_sector(cur_drv));
1849 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK, 0x00, 0x00);
1850 } else {
1851 if (cur_drv->sect == cur_drv->last_sect) {
1852 fdctrl->data_state &= ~FD_STATE_FORMAT;
1853 /* Last sector done */
1854 fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00);
1855 } else {
1856 /* More to do */
1857 fdctrl->data_pos = 0;
1858 fdctrl->data_len = 4;
1859 }
1860 }
1861 }
1862
1863 static void fdctrl_handle_lock(FDCtrl *fdctrl, int direction)
1864 {
1865 fdctrl->lock = (fdctrl->fifo[0] & 0x80) ? 1 : 0;
1866 fdctrl->fifo[0] = fdctrl->lock << 4;
1867 fdctrl_to_result_phase(fdctrl, 1);
1868 }
1869
1870 static void fdctrl_handle_dumpreg(FDCtrl *fdctrl, int direction)
1871 {
1872 FDrive *cur_drv = get_cur_drv(fdctrl);
1873
1874 /* Drives position */
1875 fdctrl->fifo[0] = drv0(fdctrl)->track;
1876 fdctrl->fifo[1] = drv1(fdctrl)->track;
1877 #if MAX_FD == 4
1878 fdctrl->fifo[2] = drv2(fdctrl)->track;
1879 fdctrl->fifo[3] = drv3(fdctrl)->track;
1880 #else
1881 fdctrl->fifo[2] = 0;
1882 fdctrl->fifo[3] = 0;
1883 #endif
1884 /* timers */
1885 fdctrl->fifo[4] = fdctrl->timer0;
1886 fdctrl->fifo[5] = (fdctrl->timer1 << 1) | (fdctrl->dor & FD_DOR_DMAEN ? 1 : 0);
1887 fdctrl->fifo[6] = cur_drv->last_sect;
1888 fdctrl->fifo[7] = (fdctrl->lock << 7) |
1889 (cur_drv->perpendicular << 2);
1890 fdctrl->fifo[8] = fdctrl->config;
1891 fdctrl->fifo[9] = fdctrl->precomp_trk;
1892 fdctrl_to_result_phase(fdctrl, 10);
1893 }
1894
1895 static void fdctrl_handle_version(FDCtrl *fdctrl, int direction)
1896 {
1897 /* Controller's version */
1898 fdctrl->fifo[0] = fdctrl->version;
1899 fdctrl_to_result_phase(fdctrl, 1);
1900 }
1901
1902 static void fdctrl_handle_partid(FDCtrl *fdctrl, int direction)
1903 {
1904 fdctrl->fifo[0] = 0x41; /* Stepping 1 */
1905 fdctrl_to_result_phase(fdctrl, 1);
1906 }
1907
1908 static void fdctrl_handle_restore(FDCtrl *fdctrl, int direction)
1909 {
1910 FDrive *cur_drv = get_cur_drv(fdctrl);
1911
1912 /* Drives position */
1913 drv0(fdctrl)->track = fdctrl->fifo[3];
1914 drv1(fdctrl)->track = fdctrl->fifo[4];
1915 #if MAX_FD == 4
1916 drv2(fdctrl)->track = fdctrl->fifo[5];
1917 drv3(fdctrl)->track = fdctrl->fifo[6];
1918 #endif
1919 /* timers */
1920 fdctrl->timer0 = fdctrl->fifo[7];
1921 fdctrl->timer1 = fdctrl->fifo[8];
1922 cur_drv->last_sect = fdctrl->fifo[9];
1923 fdctrl->lock = fdctrl->fifo[10] >> 7;
1924 cur_drv->perpendicular = (fdctrl->fifo[10] >> 2) & 0xF;
1925 fdctrl->config = fdctrl->fifo[11];
1926 fdctrl->precomp_trk = fdctrl->fifo[12];
1927 fdctrl->pwrd = fdctrl->fifo[13];
1928 fdctrl_to_command_phase(fdctrl);
1929 }
1930
1931 static void fdctrl_handle_save(FDCtrl *fdctrl, int direction)
1932 {
1933 FDrive *cur_drv = get_cur_drv(fdctrl);
1934
1935 fdctrl->fifo[0] = 0;
1936 fdctrl->fifo[1] = 0;
1937 /* Drives position */
1938 fdctrl->fifo[2] = drv0(fdctrl)->track;
1939 fdctrl->fifo[3] = drv1(fdctrl)->track;
1940 #if MAX_FD == 4
1941 fdctrl->fifo[4] = drv2(fdctrl)->track;
1942 fdctrl->fifo[5] = drv3(fdctrl)->track;
1943 #else
1944 fdctrl->fifo[4] = 0;
1945 fdctrl->fifo[5] = 0;
1946 #endif
1947 /* timers */
1948 fdctrl->fifo[6] = fdctrl->timer0;
1949 fdctrl->fifo[7] = fdctrl->timer1;
1950 fdctrl->fifo[8] = cur_drv->last_sect;
1951 fdctrl->fifo[9] = (fdctrl->lock << 7) |
1952 (cur_drv->perpendicular << 2);
1953 fdctrl->fifo[10] = fdctrl->config;
1954 fdctrl->fifo[11] = fdctrl->precomp_trk;
1955 fdctrl->fifo[12] = fdctrl->pwrd;
1956 fdctrl->fifo[13] = 0;
1957 fdctrl->fifo[14] = 0;
1958 fdctrl_to_result_phase(fdctrl, 15);
1959 }
1960
1961 static void fdctrl_handle_readid(FDCtrl *fdctrl, int direction)
1962 {
1963 FDrive *cur_drv;
1964
1965 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1966 cur_drv = get_cur_drv(fdctrl);
1967
1968 cur_drv->head = (fdctrl->fifo[1] >> 2) & 1;
1969 timer_mod(fdctrl->result_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
1970 (NANOSECONDS_PER_SECOND / 50));
1971 }
1972
1973 static void fdctrl_handle_format_track(FDCtrl *fdctrl, int direction)
1974 {
1975 FDrive *cur_drv;
1976
1977 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1978 cur_drv = get_cur_drv(fdctrl);
1979 fdctrl->data_state |= FD_STATE_FORMAT;
1980 if (fdctrl->fifo[0] & 0x80)
1981 fdctrl->data_state |= FD_STATE_MULTI;
1982 else
1983 fdctrl->data_state &= ~FD_STATE_MULTI;
1984 cur_drv->bps =
1985 fdctrl->fifo[2] > 7 ? 16384 : 128 << fdctrl->fifo[2];
1986 #if 0
1987 cur_drv->last_sect =
1988 cur_drv->flags & FDISK_DBL_SIDES ? fdctrl->fifo[3] :
1989 fdctrl->fifo[3] / 2;
1990 #else
1991 cur_drv->last_sect = fdctrl->fifo[3];
1992 #endif
1993 /* TODO: implement format using DMA expected by the Bochs BIOS
1994 * and Linux fdformat (read 3 bytes per sector via DMA and fill
1995 * the sector with the specified fill byte
1996 */
1997 fdctrl->data_state &= ~FD_STATE_FORMAT;
1998 fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00);
1999 }
2000
2001 static void fdctrl_handle_specify(FDCtrl *fdctrl, int direction)
2002 {
2003 fdctrl->timer0 = (fdctrl->fifo[1] >> 4) & 0xF;
2004 fdctrl->timer1 = fdctrl->fifo[2] >> 1;
2005 if (fdctrl->fifo[2] & 1)
2006 fdctrl->dor &= ~FD_DOR_DMAEN;
2007 else
2008 fdctrl->dor |= FD_DOR_DMAEN;
2009 /* No result back */
2010 fdctrl_to_command_phase(fdctrl);
2011 }
2012
2013 static void fdctrl_handle_sense_drive_status(FDCtrl *fdctrl, int direction)
2014 {
2015 FDrive *cur_drv;
2016
2017 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
2018 cur_drv = get_cur_drv(fdctrl);
2019 cur_drv->head = (fdctrl->fifo[1] >> 2) & 1;
2020 /* 1 Byte status back */
2021 fdctrl->fifo[0] = (cur_drv->ro << 6) |
2022 (cur_drv->track == 0 ? 0x10 : 0x00) |
2023 (cur_drv->head << 2) |
2024 GET_CUR_DRV(fdctrl) |
2025 0x28;
2026 fdctrl_to_result_phase(fdctrl, 1);
2027 }
2028
2029 static void fdctrl_handle_recalibrate(FDCtrl *fdctrl, int direction)
2030 {
2031 FDrive *cur_drv;
2032
2033 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
2034 cur_drv = get_cur_drv(fdctrl);
2035 fd_recalibrate(cur_drv);
2036 fdctrl_to_command_phase(fdctrl);
2037 /* Raise Interrupt */
2038 fdctrl->status0 |= FD_SR0_SEEK;
2039 fdctrl_raise_irq(fdctrl);
2040 }
2041
2042 static void fdctrl_handle_sense_interrupt_status(FDCtrl *fdctrl, int direction)
2043 {
2044 FDrive *cur_drv = get_cur_drv(fdctrl);
2045
2046 if (fdctrl->reset_sensei > 0) {
2047 fdctrl->fifo[0] =
2048 FD_SR0_RDYCHG + FD_RESET_SENSEI_COUNT - fdctrl->reset_sensei;
2049 fdctrl->reset_sensei--;
2050 } else if (!(fdctrl->sra & FD_SRA_INTPEND)) {
2051 fdctrl->fifo[0] = FD_SR0_INVCMD;
2052 fdctrl_to_result_phase(fdctrl, 1);
2053 return;
2054 } else {
2055 fdctrl->fifo[0] =
2056 (fdctrl->status0 & ~(FD_SR0_HEAD | FD_SR0_DS1 | FD_SR0_DS0))
2057 | GET_CUR_DRV(fdctrl);
2058 }
2059
2060 fdctrl->fifo[1] = cur_drv->track;
2061 fdctrl_to_result_phase(fdctrl, 2);
2062 fdctrl_reset_irq(fdctrl);
2063 fdctrl->status0 = FD_SR0_RDYCHG;
2064 }
2065
2066 static void fdctrl_handle_seek(FDCtrl *fdctrl, int direction)
2067 {
2068 FDrive *cur_drv;
2069
2070 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
2071 cur_drv = get_cur_drv(fdctrl);
2072 fdctrl_to_command_phase(fdctrl);
2073 /* The seek command just sends step pulses to the drive and doesn't care if
2074 * there is a medium inserted of if it's banging the head against the drive.
2075 */
2076 fd_seek(cur_drv, cur_drv->head, fdctrl->fifo[2], cur_drv->sect, 1);
2077 /* Raise Interrupt */
2078 fdctrl->status0 |= FD_SR0_SEEK;
2079 fdctrl_raise_irq(fdctrl);
2080 }
2081
2082 static void fdctrl_handle_perpendicular_mode(FDCtrl *fdctrl, int direction)
2083 {
2084 FDrive *cur_drv = get_cur_drv(fdctrl);
2085
2086 if (fdctrl->fifo[1] & 0x80)
2087 cur_drv->perpendicular = fdctrl->fifo[1] & 0x7;
2088 /* No result back */
2089 fdctrl_to_command_phase(fdctrl);
2090 }
2091
2092 static void fdctrl_handle_configure(FDCtrl *fdctrl, int direction)
2093 {
2094 fdctrl->config = fdctrl->fifo[2];
2095 fdctrl->precomp_trk = fdctrl->fifo[3];
2096 /* No result back */
2097 fdctrl_to_command_phase(fdctrl);
2098 }
2099
2100 static void fdctrl_handle_powerdown_mode(FDCtrl *fdctrl, int direction)
2101 {
2102 fdctrl->pwrd = fdctrl->fifo[1];
2103 fdctrl->fifo[0] = fdctrl->fifo[1];
2104 fdctrl_to_result_phase(fdctrl, 1);
2105 }
2106
2107 static void fdctrl_handle_option(FDCtrl *fdctrl, int direction)
2108 {
2109 /* No result back */
2110 fdctrl_to_command_phase(fdctrl);
2111 }
2112
2113 static void fdctrl_handle_drive_specification_command(FDCtrl *fdctrl, int direction)
2114 {
2115 FDrive *cur_drv = get_cur_drv(fdctrl);
2116 uint32_t pos;
2117
2118 pos = fdctrl->data_pos - 1;
2119 pos %= FD_SECTOR_LEN;
2120 if (fdctrl->fifo[pos] & 0x80) {
2121 /* Command parameters done */
2122 if (fdctrl->fifo[pos] & 0x40) {
2123 fdctrl->fifo[0] = fdctrl->fifo[1];
2124 fdctrl->fifo[2] = 0;
2125 fdctrl->fifo[3] = 0;
2126 fdctrl_to_result_phase(fdctrl, 4);
2127 } else {
2128 fdctrl_to_command_phase(fdctrl);
2129 }
2130 } else if (fdctrl->data_len > 7) {
2131 /* ERROR */
2132 fdctrl->fifo[0] = 0x80 |
2133 (cur_drv->head << 2) | GET_CUR_DRV(fdctrl);
2134 fdctrl_to_result_phase(fdctrl, 1);
2135 }
2136 }
2137
2138 static void fdctrl_handle_relative_seek_in(FDCtrl *fdctrl, int direction)
2139 {
2140 FDrive *cur_drv;
2141
2142 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
2143 cur_drv = get_cur_drv(fdctrl);
2144 if (fdctrl->fifo[2] + cur_drv->track >= cur_drv->max_track) {
2145 fd_seek(cur_drv, cur_drv->head, cur_drv->max_track - 1,
2146 cur_drv->sect, 1);
2147 } else {
2148 fd_seek(cur_drv, cur_drv->head,
2149 cur_drv->track + fdctrl->fifo[2], cur_drv->sect, 1);
2150 }
2151 fdctrl_to_command_phase(fdctrl);
2152 /* Raise Interrupt */
2153 fdctrl->status0 |= FD_SR0_SEEK;
2154 fdctrl_raise_irq(fdctrl);
2155 }
2156
2157 static void fdctrl_handle_relative_seek_out(FDCtrl *fdctrl, int direction)
2158 {
2159 FDrive *cur_drv;
2160
2161 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
2162 cur_drv = get_cur_drv(fdctrl);
2163 if (fdctrl->fifo[2] > cur_drv->track) {
2164 fd_seek(cur_drv, cur_drv->head, 0, cur_drv->sect, 1);
2165 } else {
2166 fd_seek(cur_drv, cur_drv->head,
2167 cur_drv->track - fdctrl->fifo[2], cur_drv->sect, 1);
2168 }
2169 fdctrl_to_command_phase(fdctrl);
2170 /* Raise Interrupt */
2171 fdctrl->status0 |= FD_SR0_SEEK;
2172 fdctrl_raise_irq(fdctrl);
2173 }
2174
2175 /*
2176 * Handlers for the execution phase of each command
2177 */
2178 typedef struct FDCtrlCommand {
2179 uint8_t value;
2180 uint8_t mask;
2181 const char* name;
2182 int parameters;
2183 void (*handler)(FDCtrl *fdctrl, int direction);
2184 int direction;
2185 } FDCtrlCommand;
2186
2187 static const FDCtrlCommand handlers[] = {
2188 { FD_CMD_READ, 0x1f, "READ", 8, fdctrl_start_transfer, FD_DIR_READ },
2189 { FD_CMD_WRITE, 0x3f, "WRITE", 8, fdctrl_start_transfer, FD_DIR_WRITE },
2190 { FD_CMD_SEEK, 0xff, "SEEK", 2, fdctrl_handle_seek },
2191 { FD_CMD_SENSE_INTERRUPT_STATUS, 0xff, "SENSE INTERRUPT STATUS", 0, fdctrl_handle_sense_interrupt_status },
2192 { FD_CMD_RECALIBRATE, 0xff, "RECALIBRATE", 1, fdctrl_handle_recalibrate },
2193 { FD_CMD_FORMAT_TRACK, 0xbf, "FORMAT TRACK", 5, fdctrl_handle_format_track },
2194 { FD_CMD_READ_TRACK, 0xbf, "READ TRACK", 8, fdctrl_start_transfer, FD_DIR_READ },
2195 { FD_CMD_RESTORE, 0xff, "RESTORE", 17, fdctrl_handle_restore }, /* part of READ DELETED DATA */
2196 { FD_CMD_SAVE, 0xff, "SAVE", 0, fdctrl_handle_save }, /* part of READ DELETED DATA */
2197 { FD_CMD_READ_DELETED, 0x1f, "READ DELETED DATA", 8, fdctrl_start_transfer_del, FD_DIR_READ },
2198 { FD_CMD_SCAN_EQUAL, 0x1f, "SCAN EQUAL", 8, fdctrl_start_transfer, FD_DIR_SCANE },
2199 { FD_CMD_VERIFY, 0x1f, "VERIFY", 8, fdctrl_start_transfer, FD_DIR_VERIFY },
2200 { FD_CMD_SCAN_LOW_OR_EQUAL, 0x1f, "SCAN LOW OR EQUAL", 8, fdctrl_start_transfer, FD_DIR_SCANL },
2201 { FD_CMD_SCAN_HIGH_OR_EQUAL, 0x1f, "SCAN HIGH OR EQUAL", 8, fdctrl_start_transfer, FD_DIR_SCANH },
2202 { FD_CMD_WRITE_DELETED, 0x3f, "WRITE DELETED DATA", 8, fdctrl_start_transfer_del, FD_DIR_WRITE },
2203 { FD_CMD_READ_ID, 0xbf, "READ ID", 1, fdctrl_handle_readid },
2204 { FD_CMD_SPECIFY, 0xff, "SPECIFY", 2, fdctrl_handle_specify },
2205 { FD_CMD_SENSE_DRIVE_STATUS, 0xff, "SENSE DRIVE STATUS", 1, fdctrl_handle_sense_drive_status },
2206 { FD_CMD_PERPENDICULAR_MODE, 0xff, "PERPENDICULAR MODE", 1, fdctrl_handle_perpendicular_mode },
2207 { FD_CMD_CONFIGURE, 0xff, "CONFIGURE", 3, fdctrl_handle_configure },
2208 { FD_CMD_POWERDOWN_MODE, 0xff, "POWERDOWN MODE", 2, fdctrl_handle_powerdown_mode },
2209 { FD_CMD_OPTION, 0xff, "OPTION", 1, fdctrl_handle_option },
2210 { FD_CMD_DRIVE_SPECIFICATION_COMMAND, 0xff, "DRIVE SPECIFICATION COMMAND", 5, fdctrl_handle_drive_specification_command },
2211 { FD_CMD_RELATIVE_SEEK_OUT, 0xff, "RELATIVE SEEK OUT", 2, fdctrl_handle_relative_seek_out },
2212 { FD_CMD_FORMAT_AND_WRITE, 0xff, "FORMAT AND WRITE", 10, fdctrl_unimplemented },
2213 { FD_CMD_RELATIVE_SEEK_IN, 0xff, "RELATIVE SEEK IN", 2, fdctrl_handle_relative_seek_in },
2214 { FD_CMD_LOCK, 0x7f, "LOCK", 0, fdctrl_handle_lock },
2215 { FD_CMD_DUMPREG, 0xff, "DUMPREG", 0, fdctrl_handle_dumpreg },
2216 { FD_CMD_VERSION, 0xff, "VERSION", 0, fdctrl_handle_version },
2217 { FD_CMD_PART_ID, 0xff, "PART ID", 0, fdctrl_handle_partid },
2218 { FD_CMD_WRITE, 0x1f, "WRITE (BeOS)", 8, fdctrl_start_transfer, FD_DIR_WRITE }, /* not in specification ; BeOS 4.5 bug */
2219 { 0, 0, "unknown", 0, fdctrl_unimplemented }, /* default handler */
2220 };
2221 /* Associate command to an index in the 'handlers' array */
2222 static uint8_t command_to_handler[256];
2223
2224 static const FDCtrlCommand *get_command(uint8_t cmd)
2225 {
2226 int idx;
2227
2228 idx = command_to_handler[cmd];
2229 FLOPPY_DPRINTF("%s command\n", handlers[idx].name);
2230 return &handlers[idx];
2231 }
2232
2233 static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value)
2234 {
2235 FDrive *cur_drv;
2236 const FDCtrlCommand *cmd;
2237 uint32_t pos;
2238
2239 /* Reset mode */
2240 if (!(fdctrl->dor & FD_DOR_nRESET)) {
2241 FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
2242 return;
2243 }
2244 if (!(fdctrl->msr & FD_MSR_RQM) || (fdctrl->msr & FD_MSR_DIO)) {
2245 FLOPPY_DPRINTF("error: controller not ready for writing\n");
2246 return;
2247 }
2248 fdctrl->dsr &= ~FD_DSR_PWRDOWN;
2249
2250 FLOPPY_DPRINTF("%s: %02x\n", __func__, value);
2251
2252 /* If data_len spans multiple sectors, the current position in the FIFO
2253 * wraps around while fdctrl->data_pos is the real position in the whole
2254 * request. */
2255 pos = fdctrl->data_pos++;
2256 pos %= FD_SECTOR_LEN;
2257 fdctrl->fifo[pos] = value;
2258
2259 if (fdctrl->data_pos == fdctrl->data_len) {
2260 fdctrl->msr &= ~FD_MSR_RQM;
2261 }
2262
2263 switch (fdctrl->phase) {
2264 case FD_PHASE_EXECUTION:
2265 /* For DMA requests, RQM should be cleared during execution phase, so
2266 * we would have errored out above. */
2267 assert(fdctrl->msr & FD_MSR_NONDMA);
2268
2269 /* FIFO data write */
2270 if (pos == FD_SECTOR_LEN - 1 ||
2271 fdctrl->data_pos == fdctrl->data_len) {
2272 cur_drv = get_cur_drv(fdctrl);
2273 if (blk_pwrite(cur_drv->blk, fd_offset(cur_drv), BDRV_SECTOR_SIZE,
2274 fdctrl->fifo, 0) < 0) {
2275 FLOPPY_DPRINTF("error writing sector %d\n",
2276 fd_sector(cur_drv));
2277 break;
2278 }
2279 if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv)) {
2280 FLOPPY_DPRINTF("error seeking to next sector %d\n",
2281 fd_sector(cur_drv));
2282 break;
2283 }
2284 }
2285
2286 /* Switch to result phase when done with the transfer */
2287 if (fdctrl->data_pos == fdctrl->data_len) {
2288 fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00);
2289 }
2290 break;
2291
2292 case FD_PHASE_COMMAND:
2293 assert(!(fdctrl->msr & FD_MSR_NONDMA));
2294 assert(fdctrl->data_pos < FD_SECTOR_LEN);
2295
2296 if (pos == 0) {
2297 /* The first byte specifies the command. Now we start reading
2298 * as many parameters as this command requires. */
2299 cmd = get_command(value);
2300 fdctrl->data_len = cmd->parameters + 1;
2301 if (cmd->parameters) {
2302 fdctrl->msr |= FD_MSR_RQM;
2303 }
2304 fdctrl->msr |= FD_MSR_CMDBUSY;
2305 }
2306
2307 if (fdctrl->data_pos == fdctrl->data_len) {
2308 /* We have all parameters now, execute the command */
2309 fdctrl->phase = FD_PHASE_EXECUTION;
2310
2311 if (fdctrl->data_state & FD_STATE_FORMAT) {
2312 fdctrl_format_sector(fdctrl);
2313 break;
2314 }
2315
2316 cmd = get_command(fdctrl->fifo[0]);
2317 FLOPPY_DPRINTF("Calling handler for '%s'\n", cmd->name);
2318 cmd->handler(fdctrl, cmd->direction);
2319 }
2320 break;
2321
2322 case FD_PHASE_RESULT:
2323 default:
2324 abort();
2325 }
2326 }
2327
2328 static void fdctrl_result_timer(void *opaque)
2329 {
2330 FDCtrl *fdctrl = opaque;
2331 FDrive *cur_drv = get_cur_drv(fdctrl);
2332
2333 /*
2334 * An empty drive has no address marks to read. Completing READ ID
2335 * successfully, with the made-up sector ID left over from the "spinning"
2336 * emulation below, tells the guest that a diskette is still present after
2337 * it has been ejected. The only error path left was a data rate mismatch,
2338 * and media_rate is never reset when the medium is removed.
2339 */
2340 if (!fd_media_present(cur_drv)) {
2341 FLOPPY_DPRINTF("read id on empty drive\n");
2342 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_MA, 0x00);
2343 return;
2344 }
2345 /* Pretend we are spinning.
2346 * This is needed for Coherent, which uses READ ID to check for
2347 * sector interleaving.
2348 */
2349 if (cur_drv->last_sect != 0) {
2350 cur_drv->sect = (cur_drv->sect % cur_drv->last_sect) + 1;
2351 }
2352 /* READ_ID can't automatically succeed! */
2353 if ((fdctrl->dsr & FD_DSR_DRATEMASK) != cur_drv->media_rate) {
2354 FLOPPY_DPRINTF("read id rate mismatch (fdc=%d, media=%d)\n",
2355 fdctrl->dsr & FD_DSR_DRATEMASK, cur_drv->media_rate);
2356 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_MA, 0x00);
2357 } else {
2358 fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00);
2359 }
2360 }
2361
2362 /* Init functions */
2363
2364 void fdctrl_init_drives(FloppyBus *bus, DriveInfo **fds)
2365 {
2366 DeviceState *dev;
2367 int i;
2368
2369 for (i = 0; i < MAX_FD; i++) {
2370 if (fds[i]) {
2371 dev = qdev_new("floppy");
2372 qdev_prop_set_uint32(dev, "unit", i);
2373 qdev_prop_set_enum(dev, "drive-type", FLOPPY_DRIVE_TYPE_AUTO);
2374 qdev_prop_set_drive_err(dev, "drive", blk_by_legacy_dinfo(fds[i]),
2375 &error_fatal);
2376 qdev_realize_and_unref(dev, &bus->bus, &error_fatal);
2377 }
2378 }
2379 }
2380
2381 void fdctrl_realize_common(DeviceState *dev, FDCtrl *fdctrl, Error **errp)
2382 {
2383 int i, j;
2384 FDrive *drive;
2385 static int command_tables_inited = 0;
2386
2387 if (fdctrl->fallback == FLOPPY_DRIVE_TYPE_AUTO) {
2388 error_setg(errp, "Cannot choose a fallback FDrive type of 'auto'");
2389 return;
2390 }
2391
2392 /* Fill 'command_to_handler' lookup table */
2393 if (!command_tables_inited) {
2394 command_tables_inited = 1;
2395 for (i = ARRAY_SIZE(handlers) - 1; i >= 0; i--) {
2396 for (j = 0; j < sizeof(command_to_handler); j++) {
2397 if ((j & handlers[i].mask) == handlers[i].value) {
2398 command_to_handler[j] = i;
2399 }
2400 }
2401 }
2402 }
2403
2404 FLOPPY_DPRINTF("init controller\n");
2405 fdctrl->fifo = qemu_memalign(512, FD_SECTOR_LEN);
2406 memset(fdctrl->fifo, 0, FD_SECTOR_LEN);
2407 fdctrl->fifo_size = 512;
2408 fdctrl->result_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
2409 fdctrl_result_timer, fdctrl);
2410
2411 fdctrl->version = 0x90; /* Intel 82078 controller */
2412 fdctrl->config = FD_CONFIG_EIS | FD_CONFIG_EFIFO; /* Implicit seek, polling & FIFO enabled */
2413 fdctrl->num_floppies = MAX_FD;
2414
2415 floppy_bus_create(fdctrl, &fdctrl->bus, dev);
2416
2417 for (i = 0; i < MAX_FD; i++) {
2418 drive = &fdctrl->drives[i];
2419 drive->fdctrl = fdctrl;
2420 fd_init(drive);
2421 fd_revalidate(drive);
2422 }
2423 }
2424
2425 static void fdc_register_types(void)
2426 {
2427 type_register_static(&floppy_bus_info);
2428 type_register_static(&floppy_drive_info);
2429 }
2430
2431 type_init(fdc_register_types)