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Kevin O'Connorf076a3e2008-02-25 22:25:15 -05001// 16bit code to access floppy drives.
2//
3// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4// Copyright (C) 2002 MandrakeSoft S.A.
5//
6// This file may be distributed under the terms of the GNU GPLv3 license.
7
8#include "types.h" // u8
9#include "disk.h" // DISK_RET_SUCCESS
10#include "config.h" // CONFIG_FLOPPY_SUPPORT
11#include "biosvar.h" // struct bregs
12#include "util.h" // irq_disable
13#include "cmos.h" // inb_cmos
14
Kevin O'Connorc65a3802008-03-02 13:58:23 -050015#define DEBUGF1(fmt, args...) bprintf(0, fmt , ##args)
16#define DEBUGF(fmt, args...)
17
Kevin O'Connorf076a3e2008-02-25 22:25:15 -050018#define BX_FLOPPY_ON_CNT 37 /* 2 seconds */
19
Kevin O'Connorf076a3e2008-02-25 22:25:15 -050020// New diskette parameter table adding 3 parameters from IBM
21// Since no provisions are made for multiple drive types, most
22// values in this table are ignored. I set parameters for 1.44M
23// floppy here
Kevin O'Connor44c631d2008-03-02 11:24:36 -050024struct floppy_ext_dbt_s diskette_param_table2 VISIBLE = {
25 .dbt = {
26 .specify1 = 0xAF,
27 .specify2 = 0x02, // head load time 0000001, DMA used
28 .shutoff_ticks = 0x25,
29 .bps_code = 0x02,
30 .sectors = 18,
31 .interblock_len = 0x1B,
32 .data_len = 0xFF,
33 .gap_len = 0x6C,
34 .fill_byte = 0xF6,
35 .settle_time = 0x0F,
36 .startup_time = 0x08,
37 },
38 .max_track = 79, // maximum track
39 .data_rate = 0, // data transfer rate
40 .drive_type = 4, // drive type in cmos
Kevin O'Connorf076a3e2008-02-25 22:25:15 -050041};
42
43// Oddities:
44// Return codes vary greatly - AL not cleared consistenlty, BDA return
45// status not set consistently, sometimes panics.
46// Extra outb(0x000a, 0x02) in read?
47// Does not disable interrupts on failure paths.
48// numfloppies used before set in int_1308
49// int_1305 verifies track but doesn't use it?
50
51static inline void
52set_diskette_current_cyl(u8 drive, u8 cyl)
53{
54 if (drive)
55 SET_BDA(floppy_track1, cyl);
56 else
57 SET_BDA(floppy_track0, cyl);
58}
59
60static u16
61get_drive_type(u8 drive)
62{
63 // check CMOS to see if drive exists
64 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
65 if (drive == 0)
66 drive_type >>= 4;
67 else
68 drive_type &= 0x0f;
69 return drive_type;
70}
71
72static u16
73floppy_media_known(u8 drive)
74{
75 if (!(GET_BDA(floppy_recalibration_status) & (1<<drive)))
76 return 0;
77 u8 v = GET_BDA(floppy_media_state[drive]);
78 if (!(v & FMS_MEDIA_DRIVE_ESTABLISHED))
79 return 0;
80 return 1;
81}
82
83static void
84floppy_reset_controller()
85{
86 // Reset controller
87 u8 val8 = inb(PORT_FD_DOR);
88 outb(val8 & ~0x04, PORT_FD_DOR);
89 outb(val8 | 0x04, PORT_FD_DOR);
90
91 // Wait for controller to come out of reset
92 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
93 ;
94}
95
96static void
97floppy_prepare_controller(u8 drive)
98{
99 CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
100
101 // turn on motor of selected drive, DMA & int enabled, normal operation
102 u8 prev_reset = inb(PORT_FD_DOR) & 0x04;
103 u8 dor = 0x10;
104 if (drive)
105 dor = 0x20;
106 dor |= 0x0c;
107 dor |= drive;
108 outb(dor, PORT_FD_DOR);
109
110 // reset the disk motor timeout value of INT 08
111 SET_BDA(floppy_motor_counter, BX_FLOPPY_ON_CNT);
112
113 // wait for drive readiness
114 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
115 ;
116
117 if (prev_reset == 0) {
118 irq_enable();
119 u8 v;
120 do {
121 v = GET_BDA(floppy_recalibration_status);
122 } while ((v & FRS_TIMEOUT) == 0);
123 irq_disable();
124
125 v &= ~FRS_TIMEOUT;
126 SET_BDA(floppy_recalibration_status, v);
127 }
128}
129
130static u8
131floppy_pio(u8 *cmd, u8 cmdlen)
132{
133 floppy_prepare_controller(cmd[1] & 1);
134
135 // send command to controller
136 u8 i;
137 for (i=0; i<cmdlen; i++)
138 outb(cmd[i], PORT_FD_DATA);
139
140 irq_enable();
141 u8 v;
142 do {
143 if (!GET_BDA(floppy_motor_counter)) {
144 irq_disable();
145 floppy_reset_controller();
146 return DISK_RET_ETIMEOUT;
147 }
148 v = GET_BDA(floppy_recalibration_status);
149 } while (!(v & FRS_TIMEOUT));
150 irq_disable();
151
152 v &= ~FRS_TIMEOUT;
153 SET_BDA(floppy_recalibration_status, v);
154
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500155 return 0;
156}
157
158static u8
159floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen)
160{
161 // es:bx = pointer to where to place information from diskette
162 // port 04: DMA-1 base and current address, channel 2
163 // port 05: DMA-1 base and current count, channel 2
164 u16 page = regs->es >> 12; // upper 4 bits
165 u16 base_es = regs->es << 4; // lower 16bits contributed by ES
166 u16 base_address = base_es + regs->bx; // lower 16 bits of address
167 // contributed by ES:BX
168 if (base_address < base_es)
169 // in case of carry, adjust page by 1
170 page++;
171
172 // check for 64K boundary overrun
173 u16 last_addr = base_address + count;
174 if (last_addr < base_address)
175 return DISK_RET_EBOUNDARY;
176
177 u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
178 if (cmd[0] == 0xe6)
179 // read
180 mode_register = 0x46;
181
Kevin O'Connor44c631d2008-03-02 11:24:36 -0500182 //DEBUGF("floppy dma c2\n");
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500183 outb(0x06, PORT_DMA1_MASK_REG);
184 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
185 outb(base_address, PORT_DMA_ADDR_2);
186 outb(base_address>>8, PORT_DMA_ADDR_2);
187 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
188 outb(count, PORT_DMA_CNT_2);
189 outb(count>>8, PORT_DMA_CNT_2);
190
191 // port 0b: DMA-1 Mode Register
192 // transfer type=write, channel 2
193 outb(mode_register, PORT_DMA1_MODE_REG);
194
195 // port 81: DMA-1 Page Register, channel 2
196 outb(page, PORT_DMA_PAGE_2);
197
198 outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
199
200 u8 ret = floppy_pio(cmd, cmdlen);
201 if (ret)
202 return ret;
203
Kevin O'Connorc65a3802008-03-02 13:58:23 -0500204 // check port 3f4 for accessibility to status bytes
205 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
206 BX_PANIC("int13_diskette: ctrl not ready\n");
207
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500208 // read 7 return status bytes from controller
209 u8 i;
210 for (i=0; i<7; i++) {
211 u8 v = inb(PORT_FD_DATA);
212 cmd[i] = v;
213 SET_BDA(floppy_return_status[i], v);
214 }
215
216 return 0;
217}
218
219static void
220floppy_drive_recal(u8 drive)
221{
222 // send Recalibrate command (2 bytes) to controller
223 u8 data[12];
224 data[0] = 0x07; // 07: Recalibrate
225 data[1] = drive; // 0=drive0, 1=drive1
226 floppy_pio(data, 2);
227
228 SETBITS_BDA(floppy_recalibration_status, 1<<drive);
229 set_diskette_current_cyl(drive, 0);
230}
231
232static u16
233floppy_media_sense(u8 drive)
234{
235 u16 rv;
236 u8 config_data, media_state;
237
238 floppy_drive_recal(drive);
239
240 // for now cheat and get drive type from CMOS,
241 // assume media is same as drive type
242
243 // ** config_data **
244 // Bitfields for diskette media control:
245 // Bit(s) Description (Table M0028)
246 // 7-6 last data rate set by controller
247 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
248 // 5-4 last diskette drive step rate selected
249 // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
250 // 3-2 {data rate at start of operation}
251 // 1-0 reserved
252
253 // ** media_state **
254 // Bitfields for diskette drive media state:
255 // Bit(s) Description (Table M0030)
256 // 7-6 data rate
257 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
258 // 5 double stepping required (e.g. 360kB in 1.2MB)
259 // 4 media type established
260 // 3 drive capable of supporting 4MB media
261 // 2-0 on exit from BIOS, contains
262 // 000 trying 360kB in 360kB
263 // 001 trying 360kB in 1.2MB
264 // 010 trying 1.2MB in 1.2MB
265 // 011 360kB in 360kB established
266 // 100 360kB in 1.2MB established
267 // 101 1.2MB in 1.2MB established
268 // 110 reserved
269 // 111 all other formats/drives
270
271 switch (get_drive_type(drive)) {
272 case 1:
273 // 360K 5.25" drive
274 config_data = 0x00; // 0000 0000
275 media_state = 0x25; // 0010 0101
276 rv = 1;
277 break;
278 case 2:
279 // 1.2 MB 5.25" drive
280 config_data = 0x00; // 0000 0000
281 media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5)
282 rv = 1;
283 break;
284 case 3:
285 // 720K 3.5" drive
286 config_data = 0x00; // 0000 0000 ???
287 media_state = 0x17; // 0001 0111
288 rv = 1;
289 break;
290 case 4:
291 // 1.44 MB 3.5" drive
292 config_data = 0x00; // 0000 0000
293 media_state = 0x17; // 0001 0111
294 rv = 1;
295 break;
296 case 5:
297 // 2.88 MB 3.5" drive
298 config_data = 0xCC; // 1100 1100
299 media_state = 0xD7; // 1101 0111
300 rv = 1;
301 break;
302 //
303 // Extended floppy size uses special cmos setting
304 case 6:
305 // 160k 5.25" drive
306 config_data = 0x00; // 0000 0000
307 media_state = 0x27; // 0010 0111
308 rv = 1;
309 break;
310 case 7:
311 // 180k 5.25" drive
312 config_data = 0x00; // 0000 0000
313 media_state = 0x27; // 0010 0111
314 rv = 1;
315 break;
316 case 8:
317 // 320k 5.25" drive
318 config_data = 0x00; // 0000 0000
319 media_state = 0x27; // 0010 0111
320 rv = 1;
321 break;
322 default:
323 // not recognized
324 config_data = 0x00; // 0000 0000
325 media_state = 0x00; // 0000 0000
326 rv = 0;
327 }
328
329 SET_BDA(floppy_last_data_rate, config_data);
330 SET_BDA(floppy_media_state[drive], media_state);
331 return rv;
332}
333
334static inline void
335floppy_ret(struct bregs *regs, u8 code)
336{
337 regs->ah = code;
338 SET_BDA(floppy_last_status, code);
339 set_cf(regs, code);
340}
341
342static inline void
343floppy_fail(struct bregs *regs, u8 code)
344{
345 regs->al = 0; // no sectors read
346 floppy_ret(regs, code);
347}
348
349static u16
350check_drive(struct bregs *regs, u8 drive)
351{
352 // see if drive exists
353 if (drive > 1 || !get_drive_type(drive)) {
Kevin O'Connorc65a3802008-03-02 13:58:23 -0500354 // XXX - return type doesn't match
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500355 floppy_fail(regs, DISK_RET_ETIMEOUT);
356 return 1;
357 }
358
359 // see if media in drive, and type is known
360 if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) {
361 floppy_fail(regs, DISK_RET_EMEDIA);
362 return 1;
363 }
364 return 0;
365}
366
367// diskette controller reset
368static void
369floppy_1300(struct bregs *regs, u8 drive)
370{
371 if (drive > 1) {
372 floppy_ret(regs, DISK_RET_EPARAM);
373 return;
374 }
375 if (!get_drive_type(drive)) {
376 floppy_ret(regs, DISK_RET_ETIMEOUT);
377 return;
378 }
379 set_diskette_current_cyl(drive, 0); // current cylinder
380 floppy_ret(regs, DISK_RET_SUCCESS);
381}
382
383// Read Diskette Status
384static void
385floppy_1301(struct bregs *regs, u8 drive)
386{
387 u8 v = GET_BDA(floppy_last_status);
388 regs->ah = v;
389 set_cf(regs, v);
390}
391
392// Read Diskette Sectors
393static void
394floppy_1302(struct bregs *regs, u8 drive)
395{
396 if (check_drive(regs, drive))
397 return;
398
399 u8 num_sectors = regs->al;
400 u8 track = regs->ch;
401 u8 sector = regs->cl;
402 u8 head = regs->dh;
403
404 if (head > 1 || sector == 0 || num_sectors == 0
405 || track > 79 || num_sectors > 72) {
406 BX_INFO("int13_diskette: read/write/verify: parameter out of range\n");
407 floppy_fail(regs, DISK_RET_EPARAM);
408 return;
409 }
410
411 // send read-normal-data command (9 bytes) to controller
412 u8 data[12];
413 data[0] = 0xe6; // e6: read normal data
414 data[1] = (head << 2) | drive; // HD DR1 DR2
415 data[2] = track;
416 data[3] = head;
417 data[4] = sector;
418 data[5] = 2; // 512 byte sector size
419 data[6] = sector + num_sectors - 1; // last sector to read on track
420 data[7] = 0; // Gap length
421 data[8] = 0xff; // Gap length
422
423 u16 ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
424 if (ret) {
425 floppy_fail(regs, ret);
426 return;
427 }
428
429 if (data[0] & 0xc0) {
430 floppy_fail(regs, DISK_RET_ECONTROLLER);
431 return;
432 }
433
434 // ??? should track be new val from return_status[3] ?
435 set_diskette_current_cyl(drive, track);
436 // AL = number of sectors read (same value as passed)
437 floppy_ret(regs, DISK_RET_SUCCESS);
438}
439
440// Write Diskette Sectors
441static void
442floppy_1303(struct bregs *regs, u8 drive)
443{
444 if (check_drive(regs, drive))
445 return;
446
447 u8 num_sectors = regs->al;
448 u8 track = regs->ch;
449 u8 sector = regs->cl;
450 u8 head = regs->dh;
451
452 if (head > 1 || sector == 0 || num_sectors == 0
453 || track > 79 || num_sectors > 72) {
454 BX_INFO("int13_diskette: read/write/verify: parameter out of range\n");
455 floppy_fail(regs, DISK_RET_EPARAM);
456 return;
457 }
458
459 // send write-normal-data command (9 bytes) to controller
460 u8 data[12];
461 data[0] = 0xc5; // c5: write normal data
462 data[1] = (head << 2) | drive; // HD DR1 DR2
463 data[2] = track;
464 data[3] = head;
465 data[4] = sector;
466 data[5] = 2; // 512 byte sector size
467 data[6] = sector + num_sectors - 1; // last sector to write on track
468 data[7] = 0; // Gap length
469 data[8] = 0xff; // Gap length
470
471 u8 ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
472 if (ret) {
473 floppy_fail(regs, ret);
474 return;
475 }
476
477 if (data[0] & 0xc0) {
478 if (data[1] & 0x02) {
479 regs->ax = 0x0300;
480 set_cf(regs, 1);
481 return;
482 }
483 BX_PANIC("int13_diskette_function: read error\n");
484 }
485
486 // ??? should track be new val from return_status[3] ?
487 set_diskette_current_cyl(drive, track);
488 // AL = number of sectors read (same value as passed)
489 floppy_ret(regs, DISK_RET_SUCCESS);
490}
491
492// Verify Diskette Sectors
493static void
494floppy_1304(struct bregs *regs, u8 drive)
495{
496 if (check_drive(regs, drive))
497 return;
498
499 u8 num_sectors = regs->al;
500 u8 track = regs->ch;
501 u8 sector = regs->cl;
502 u8 head = regs->dh;
503
504 if (head > 1 || sector == 0 || num_sectors == 0
505 || track > 79 || num_sectors > 72) {
506 BX_INFO("int13_diskette: read/write/verify: parameter out of range\n");
507 floppy_fail(regs, DISK_RET_EPARAM);
508 return;
509 }
510
511 // ??? should track be new val from return_status[3] ?
512 set_diskette_current_cyl(drive, track);
513 // AL = number of sectors verified (same value as passed)
514 floppy_ret(regs, DISK_RET_SUCCESS);
515}
516
517// format diskette track
518static void
519floppy_1305(struct bregs *regs, u8 drive)
520{
521 DEBUGF("floppy f05\n");
522
523 if (check_drive(regs, drive))
524 return;
525
526 u8 num_sectors = regs->al;
527 u8 head = regs->dh;
528
529 if (head > 1 || num_sectors == 0 || num_sectors > 18) {
530 BX_INFO("int13_diskette: read/write/verify: parameter out of range\n");
531 floppy_fail(regs, DISK_RET_EPARAM);
532 return;
533 }
534
535 // send format-track command (6 bytes) to controller
536 u8 data[12];
537 data[0] = 0x4d; // 4d: format track
538 data[1] = (head << 2) | drive; // HD DR1 DR2
539 data[2] = 2; // 512 byte sector size
540 data[3] = num_sectors; // number of sectors per track
541 data[4] = 0; // Gap length
542 data[5] = 0xf6; // Fill byte
543
544 u8 ret = floppy_cmd(regs, (num_sectors * 4) - 1, data, 6);
545 if (ret) {
546 floppy_fail(regs, ret);
547 return;
548 }
549
550 if (data[0] & 0xc0) {
551 if (data[1] & 0x02) {
552 regs->ax = 0x0300;
553 set_cf(regs, 1);
554 return;
555 }
556 BX_PANIC("int13_diskette_function: read error\n");
557 }
558
559 set_diskette_current_cyl(drive, 0);
560 floppy_ret(regs, 0);
561}
562
563// read diskette drive parameters
564static void
565floppy_1308(struct bregs *regs, u8 drive)
566{
567 DEBUGF("floppy f08\n");
568
569 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
570 u8 num_floppies = 0;
571 if (drive_type & 0xf0)
572 num_floppies++;
573 if (drive_type & 0x0f)
574 num_floppies++;
575
576 if (drive > 1) {
577 regs->ax = 0;
578 regs->bx = 0;
579 regs->cx = 0;
580 regs->dx = 0;
581 regs->es = 0;
582 regs->di = 0;
583 regs->dl = num_floppies;
584 set_cf(regs, 0);
585 return;
586 }
587
588 if (drive == 0)
589 drive_type >>= 4;
590 else
591 drive_type &= 0x0f;
592
593 regs->bh = 0;
594 regs->bl = drive_type;
595 regs->ah = 0;
596 regs->al = 0;
597 regs->dl = num_floppies;
598
599 switch (drive_type) {
600 case 0: // none
601 regs->cx = 0;
602 regs->dh = 0; // max head #
603 break;
604
605 case 1: // 360KB, 5.25"
606 regs->cx = 0x2709; // 40 tracks, 9 sectors
607 regs->dh = 1; // max head #
608 break;
609
610 case 2: // 1.2MB, 5.25"
611 regs->cx = 0x4f0f; // 80 tracks, 15 sectors
612 regs->dh = 1; // max head #
613 break;
614
615 case 3: // 720KB, 3.5"
616 regs->cx = 0x4f09; // 80 tracks, 9 sectors
617 regs->dh = 1; // max head #
618 break;
619
620 case 4: // 1.44MB, 3.5"
621 regs->cx = 0x4f12; // 80 tracks, 18 sectors
622 regs->dh = 1; // max head #
623 break;
624
625 case 5: // 2.88MB, 3.5"
626 regs->cx = 0x4f24; // 80 tracks, 36 sectors
627 regs->dh = 1; // max head #
628 break;
629
630 case 6: // 160k, 5.25"
631 regs->cx = 0x2708; // 40 tracks, 8 sectors
632 regs->dh = 0; // max head #
633 break;
634
635 case 7: // 180k, 5.25"
636 regs->cx = 0x2709; // 40 tracks, 9 sectors
637 regs->dh = 0; // max head #
638 break;
639
640 case 8: // 320k, 5.25"
641 regs->cx = 0x2708; // 40 tracks, 8 sectors
642 regs->dh = 1; // max head #
643 break;
644
645 default: // ?
646 BX_PANIC("floppy: int13: bad floppy type\n");
647 }
648
649 /* set es & di to point to 11 byte diskette param table in ROM */
650 regs->es = SEG_BIOS;
Kevin O'Connor44c631d2008-03-02 11:24:36 -0500651 regs->di = (u16)&diskette_param_table2;
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500652 /* disk status not changed upon success */
653}
654
655// read diskette drive type
656static void
657floppy_1315(struct bregs *regs, u8 drive)
658{
659 DEBUGF("floppy f15\n");
660 if (drive > 1) {
661 regs->ah = 0; // only 2 drives supported
662 // set_diskette_ret_status here ???
663 set_cf(regs, 1);
664 return;
665 }
666 u8 drive_type = get_drive_type(drive);
667
668 regs->ah = (drive_type != 0);
669 set_cf(regs, 0);
670}
671
672// get diskette change line status
673static void
674floppy_1316(struct bregs *regs, u8 drive)
675{
676 DEBUGF("floppy f16\n");
677 if (drive > 1) {
678 floppy_ret(regs, DISK_RET_EPARAM);
679 return;
680 }
681 floppy_ret(regs, DISK_RET_ECHANGED);
682}
683
684static void
685floppy_13XX(struct bregs *regs, u8 drive)
686{
Kevin O'Connorb792b3c2008-02-29 00:20:32 -0500687 BX_INFO("int13_diskette: unsupported AH=%02x\n", regs->ah);
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500688 floppy_ret(regs, DISK_RET_EPARAM);
689}
690
691void
692floppy_13(struct bregs *regs, u8 drive)
693{
Kevin O'Connorb792b3c2008-02-29 00:20:32 -0500694 if (! CONFIG_FLOPPY_SUPPORT) {
695 // Minimal stubs
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500696 switch (regs->ah) {
697 case 0x01: floppy_1301(regs, drive); break;
698 default: floppy_13XX(regs, drive); break;
699 }
Kevin O'Connorb792b3c2008-02-29 00:20:32 -0500700 return;
701 }
702 switch (regs->ah) {
703 case 0x00: floppy_1300(regs, drive); break;
704 case 0x01: floppy_1301(regs, drive); break;
705 case 0x02: floppy_1302(regs, drive); break;
706 case 0x03: floppy_1303(regs, drive); break;
707 case 0x04: floppy_1304(regs, drive); break;
708 case 0x05: floppy_1305(regs, drive); break;
709 case 0x08: floppy_1308(regs, drive); break;
710 case 0x15: floppy_1315(regs, drive); break;
711 case 0x16: floppy_1316(regs, drive); break;
712 default: floppy_13XX(regs, drive); break;
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500713 }
714}
715
716// INT 0Eh Diskette Hardware ISR Entry Point
717void VISIBLE
718handle_0e(struct bregs *regs)
719{
Kevin O'Connorc65a3802008-03-02 13:58:23 -0500720 //debug_isr(regs);
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500721 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
722 outb(0x08, PORT_FD_DATA); // sense interrupt status
723 while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
724 ;
725 do {
726 inb(PORT_FD_DATA);
727 } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
728 }
729 eoi_master_pic();
730 // diskette interrupt has occurred
731 SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
732}
733
734// Called from int08 handler.
735void
736floppy_tick()
737{
738 // time to turn off drive(s)?
739 u8 fcount = GET_BDA(floppy_motor_counter);
740 if (fcount) {
741 fcount--;
742 SET_BDA(floppy_motor_counter, fcount);
743 if (fcount == 0)
744 // turn motor(s) off
745 outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);
746 }
747}