1 // 16bit code to access floppy drives.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU GPLv3 license.
8 #include "types.h" // u8
9 #include "disk.h" // DISK_RET_SUCCESS
10 #include "config.h" // CONFIG_FLOPPY_SUPPORT
11 #include "biosvar.h" // SET_BDA
12 #include "util.h" // irq_disable
13 #include "cmos.h" // inb_cmos
14 #include "pic.h" // unmask_pic1
15 #include "bregs.h" // struct bregs
17 #define BX_FLOPPY_ON_CNT 37 /* 2 seconds */
19 // New diskette parameter table adding 3 parameters from IBM
20 // Since no provisions are made for multiple drive types, most
21 // values in this table are ignored. I set parameters for 1.44M
23 struct floppy_ext_dbt_s diskette_param_table2 VISIBLE16 = {
26 .specify2 = 0x02, // head load time 0000001, DMA used
27 .shutoff_ticks = 0x25,
30 .interblock_len = 0x1B,
37 .max_track = 79, // maximum track
38 .data_rate = 0, // data transfer rate
39 .drive_type = 4, // drive type in cmos
45 if (! CONFIG_FLOPPY_SUPPORT)
47 dprintf(3, "init floppy drives\n");
48 u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
60 SET_BDA(floppy_harddisk_info, out);
62 // Update equipment word bits for floppy
63 if (num_floppies == 1)
64 // 1 drive, ready for boot
65 SETBITS_BDA(equipment_list_flags, 0x01);
66 else if (num_floppies == 2)
67 // 2 drives, ready for boot
68 SETBITS_BDA(equipment_list_flags, 0x41);
70 outb(0x02, PORT_DMA1_MASK_REG);
72 // Enable IRQ6 (handle_0e)
73 unmask_pic1(PIC1_IRQ6);
77 set_diskette_current_cyl(u8 drive, u8 cyl)
80 SET_BDA(floppy_track1, cyl);
82 SET_BDA(floppy_track0, cyl);
86 get_drive_type(u8 drive)
88 // check CMOS to see if drive exists
89 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
98 floppy_media_known(u8 drive)
100 if (!(GET_BDA(floppy_recalibration_status) & (1<<drive)))
102 u8 v = GET_BDA(floppy_media_state[drive]);
103 if (!(v & FMS_MEDIA_DRIVE_ESTABLISHED))
109 floppy_reset_controller()
112 u8 val8 = inb(PORT_FD_DOR);
113 outb(val8 & ~0x04, PORT_FD_DOR);
114 outb(val8 | 0x04, PORT_FD_DOR);
116 // Wait for controller to come out of reset
117 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
122 floppy_prepare_controller(u8 drive)
124 CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
126 // turn on motor of selected drive, DMA & int enabled, normal operation
127 u8 prev_reset = inb(PORT_FD_DOR) & 0x04;
133 outb(dor, PORT_FD_DOR);
135 // reset the disk motor timeout value of INT 08
136 SET_BDA(floppy_motor_counter, BX_FLOPPY_ON_CNT);
138 // wait for drive readiness
139 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
142 if (prev_reset == 0) {
146 v = GET_BDA(floppy_recalibration_status);
154 SET_BDA(floppy_recalibration_status, v);
159 floppy_pio(u8 *cmd, u8 cmdlen)
161 floppy_prepare_controller(cmd[1] & 1);
163 // send command to controller
165 for (i=0; i<cmdlen; i++)
166 outb(cmd[i], PORT_FD_DATA);
171 if (!GET_BDA(floppy_motor_counter)) {
173 floppy_reset_controller();
176 v = GET_BDA(floppy_recalibration_status);
184 SET_BDA(floppy_recalibration_status, v);
189 #define floppy_ret(regs, code) \
190 __floppy_ret(__func__, __LINE__, (regs), (code))
193 __floppy_ret(const char *fname, int lineno, struct bregs *regs, u8 code)
195 SET_BDA(floppy_last_status, code);
197 __set_code_fail(fname, lineno, regs, code);
199 set_code_success(regs);
203 floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen)
205 // es:bx = pointer to where to place information from diskette
206 u32 addr = (u32)MAKE_FARPTR(regs->es, regs->bx);
208 // check for 64K boundary overrun
209 u32 last_addr = addr + count;
210 if ((addr >> 16) != (last_addr >> 16)) {
211 floppy_ret(regs, DISK_RET_EBOUNDARY);
215 u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
218 mode_register = 0x46;
220 //DEBUGF("floppy dma c2\n");
221 outb(0x06, PORT_DMA1_MASK_REG);
222 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
223 outb(addr, PORT_DMA_ADDR_2);
224 outb(addr>>8, PORT_DMA_ADDR_2);
225 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
226 outb(count, PORT_DMA_CNT_2);
227 outb(count>>8, PORT_DMA_CNT_2);
229 // port 0b: DMA-1 Mode Register
230 // transfer type=write, channel 2
231 outb(mode_register, PORT_DMA1_MODE_REG);
233 // port 81: DMA-1 Page Register, channel 2
234 outb(addr>>16, PORT_DMA_PAGE_2);
236 outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
238 int ret = floppy_pio(cmd, cmdlen);
240 floppy_ret(regs, DISK_RET_ETIMEOUT);
244 // check port 3f4 for accessibility to status bytes
245 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
246 BX_PANIC("int13_diskette: ctrl not ready\n");
248 // read 7 return status bytes from controller
250 for (i=0; i<7; i++) {
251 u8 v = inb(PORT_FD_DATA);
253 SET_BDA(floppy_return_status[i], v);
260 floppy_drive_recal(u8 drive)
262 // send Recalibrate command (2 bytes) to controller
264 data[0] = 0x07; // 07: Recalibrate
265 data[1] = drive; // 0=drive0, 1=drive1
268 SETBITS_BDA(floppy_recalibration_status, 1<<drive);
269 set_diskette_current_cyl(drive, 0);
273 floppy_media_sense(u8 drive)
276 u8 config_data, media_state;
278 floppy_drive_recal(drive);
280 // for now cheat and get drive type from CMOS,
281 // assume media is same as drive type
284 // Bitfields for diskette media control:
285 // Bit(s) Description (Table M0028)
286 // 7-6 last data rate set by controller
287 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
288 // 5-4 last diskette drive step rate selected
289 // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
290 // 3-2 {data rate at start of operation}
294 // Bitfields for diskette drive media state:
295 // Bit(s) Description (Table M0030)
297 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
298 // 5 double stepping required (e.g. 360kB in 1.2MB)
299 // 4 media type established
300 // 3 drive capable of supporting 4MB media
301 // 2-0 on exit from BIOS, contains
302 // 000 trying 360kB in 360kB
303 // 001 trying 360kB in 1.2MB
304 // 010 trying 1.2MB in 1.2MB
305 // 011 360kB in 360kB established
306 // 100 360kB in 1.2MB established
307 // 101 1.2MB in 1.2MB established
309 // 111 all other formats/drives
311 switch (get_drive_type(drive)) {
314 config_data = 0x00; // 0000 0000
315 media_state = 0x25; // 0010 0101
319 // 1.2 MB 5.25" drive
320 config_data = 0x00; // 0000 0000
321 media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5)
326 config_data = 0x00; // 0000 0000 ???
327 media_state = 0x17; // 0001 0111
331 // 1.44 MB 3.5" drive
332 config_data = 0x00; // 0000 0000
333 media_state = 0x17; // 0001 0111
337 // 2.88 MB 3.5" drive
338 config_data = 0xCC; // 1100 1100
339 media_state = 0xD7; // 1101 0111
343 // Extended floppy size uses special cmos setting
346 config_data = 0x00; // 0000 0000
347 media_state = 0x27; // 0010 0111
352 config_data = 0x00; // 0000 0000
353 media_state = 0x27; // 0010 0111
358 config_data = 0x00; // 0000 0000
359 media_state = 0x27; // 0010 0111
364 config_data = 0x00; // 0000 0000
365 media_state = 0x00; // 0000 0000
369 SET_BDA(floppy_last_data_rate, config_data);
370 SET_BDA(floppy_media_state[drive], media_state);
375 check_drive(struct bregs *regs, u8 drive)
377 // see if drive exists
378 if (drive > 1 || !get_drive_type(drive)) {
379 // XXX - return type doesn't match
380 floppy_ret(regs, DISK_RET_ETIMEOUT);
384 // see if media in drive, and type is known
385 if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) {
386 floppy_ret(regs, DISK_RET_EMEDIA);
392 // diskette controller reset
394 floppy_1300(struct bregs *regs, u8 drive)
397 floppy_ret(regs, DISK_RET_EPARAM);
400 if (!get_drive_type(drive)) {
401 floppy_ret(regs, DISK_RET_ETIMEOUT);
404 set_diskette_current_cyl(drive, 0); // current cylinder
405 floppy_ret(regs, DISK_RET_SUCCESS);
408 // Read Diskette Status
410 floppy_1301(struct bregs *regs, u8 drive)
412 u8 v = GET_BDA(floppy_last_status);
417 // Read Diskette Sectors
419 floppy_1302(struct bregs *regs, u8 drive)
421 if (check_drive(regs, drive))
424 u8 num_sectors = regs->al;
426 u8 sector = regs->cl;
429 if (head > 1 || sector == 0 || num_sectors == 0
430 || track > 79 || num_sectors > 72) {
431 floppy_ret(regs, DISK_RET_EPARAM);
435 // send read-normal-data command (9 bytes) to controller
437 data[0] = 0xe6; // e6: read normal data
438 data[1] = (head << 2) | drive; // HD DR1 DR2
442 data[5] = 2; // 512 byte sector size
443 data[6] = sector + num_sectors - 1; // last sector to read on track
444 data[7] = 0; // Gap length
445 data[8] = 0xff; // Gap length
447 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
451 if (data[0] & 0xc0) {
452 floppy_ret(regs, DISK_RET_ECONTROLLER);
456 // ??? should track be new val from return_status[3] ?
457 set_diskette_current_cyl(drive, track);
458 // AL = number of sectors read (same value as passed)
459 floppy_ret(regs, DISK_RET_SUCCESS);
462 regs->al = 0; // no sectors read
465 // Write Diskette Sectors
467 floppy_1303(struct bregs *regs, u8 drive)
469 if (check_drive(regs, drive))
472 u8 num_sectors = regs->al;
474 u8 sector = regs->cl;
477 if (head > 1 || sector == 0 || num_sectors == 0
478 || track > 79 || num_sectors > 72) {
479 floppy_ret(regs, DISK_RET_EPARAM);
483 // send write-normal-data command (9 bytes) to controller
485 data[0] = 0xc5; // c5: write normal data
486 data[1] = (head << 2) | drive; // HD DR1 DR2
490 data[5] = 2; // 512 byte sector size
491 data[6] = sector + num_sectors - 1; // last sector to write on track
492 data[7] = 0; // Gap length
493 data[8] = 0xff; // Gap length
495 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
499 if (data[0] & 0xc0) {
500 if (data[1] & 0x02) {
501 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
504 BX_PANIC("int13_diskette_function: read error\n");
507 // ??? should track be new val from return_status[3] ?
508 set_diskette_current_cyl(drive, track);
509 // AL = number of sectors read (same value as passed)
510 floppy_ret(regs, DISK_RET_SUCCESS);
513 regs->al = 0; // no sectors read
516 // Verify Diskette Sectors
518 floppy_1304(struct bregs *regs, u8 drive)
520 if (check_drive(regs, drive))
523 u8 num_sectors = regs->al;
525 u8 sector = regs->cl;
528 if (head > 1 || sector == 0 || num_sectors == 0
529 || track > 79 || num_sectors > 72) {
530 floppy_ret(regs, DISK_RET_EPARAM);
534 // ??? should track be new val from return_status[3] ?
535 set_diskette_current_cyl(drive, track);
536 // AL = number of sectors verified (same value as passed)
537 floppy_ret(regs, DISK_RET_SUCCESS);
540 regs->al = 0; // no sectors read
543 // format diskette track
545 floppy_1305(struct bregs *regs, u8 drive)
547 dprintf(3, "floppy f05\n");
549 if (check_drive(regs, drive))
552 u8 num_sectors = regs->al;
555 if (head > 1 || num_sectors == 0 || num_sectors > 18) {
556 floppy_ret(regs, DISK_RET_EPARAM);
560 // send format-track command (6 bytes) to controller
562 data[0] = 0x4d; // 4d: format track
563 data[1] = (head << 2) | drive; // HD DR1 DR2
564 data[2] = 2; // 512 byte sector size
565 data[3] = num_sectors; // number of sectors per track
566 data[4] = 0; // Gap length
567 data[5] = 0xf6; // Fill byte
569 int ret = floppy_cmd(regs, (num_sectors * 4) - 1, data, 6);
573 if (data[0] & 0xc0) {
574 if (data[1] & 0x02) {
575 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
578 BX_PANIC("int13_diskette_function: read error\n");
581 set_diskette_current_cyl(drive, 0);
585 // read diskette drive parameters
587 floppy_1308(struct bregs *regs, u8 drive)
589 dprintf(3, "floppy f08\n");
591 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
593 if (drive_type & 0xf0)
595 if (drive_type & 0x0f)
605 regs->dl = num_floppies;
616 regs->bl = drive_type;
619 regs->dl = num_floppies;
621 switch (drive_type) {
624 regs->dh = 0; // max head #
627 case 1: // 360KB, 5.25"
628 regs->cx = 0x2709; // 40 tracks, 9 sectors
629 regs->dh = 1; // max head #
632 case 2: // 1.2MB, 5.25"
633 regs->cx = 0x4f0f; // 80 tracks, 15 sectors
634 regs->dh = 1; // max head #
637 case 3: // 720KB, 3.5"
638 regs->cx = 0x4f09; // 80 tracks, 9 sectors
639 regs->dh = 1; // max head #
642 case 4: // 1.44MB, 3.5"
643 regs->cx = 0x4f12; // 80 tracks, 18 sectors
644 regs->dh = 1; // max head #
647 case 5: // 2.88MB, 3.5"
648 regs->cx = 0x4f24; // 80 tracks, 36 sectors
649 regs->dh = 1; // max head #
652 case 6: // 160k, 5.25"
653 regs->cx = 0x2708; // 40 tracks, 8 sectors
654 regs->dh = 0; // max head #
657 case 7: // 180k, 5.25"
658 regs->cx = 0x2709; // 40 tracks, 9 sectors
659 regs->dh = 0; // max head #
662 case 8: // 320k, 5.25"
663 regs->cx = 0x2708; // 40 tracks, 8 sectors
664 regs->dh = 1; // max head #
668 BX_PANIC("floppy: int13: bad floppy type\n");
671 /* set es & di to point to 11 byte diskette param table in ROM */
673 regs->di = (u32)&diskette_param_table2;
674 /* disk status not changed upon success */
678 // read diskette drive type
680 floppy_1315(struct bregs *regs, u8 drive)
682 dprintf(6, "floppy f15\n");
685 regs->ah = 0; // only 2 drives supported
686 // set_diskette_ret_status here ???
689 u8 drive_type = get_drive_type(drive);
691 regs->ah = (drive_type != 0);
695 // get diskette change line status
697 floppy_1316(struct bregs *regs, u8 drive)
700 floppy_ret(regs, DISK_RET_EPARAM);
703 floppy_ret(regs, DISK_RET_ECHANGED);
707 floppy_13XX(struct bregs *regs, u8 drive)
709 floppy_ret(regs, DISK_RET_EPARAM);
713 floppy_13(struct bregs *regs, u8 drive)
715 if (! CONFIG_FLOPPY_SUPPORT) {
718 case 0x01: floppy_1301(regs, drive); break;
719 default: floppy_13XX(regs, drive); break;
724 case 0x00: floppy_1300(regs, drive); break;
725 case 0x01: floppy_1301(regs, drive); break;
726 case 0x02: floppy_1302(regs, drive); break;
727 case 0x03: floppy_1303(regs, drive); break;
728 case 0x04: floppy_1304(regs, drive); break;
729 case 0x05: floppy_1305(regs, drive); break;
730 case 0x08: floppy_1308(regs, drive); break;
731 case 0x15: floppy_1315(regs, drive); break;
732 case 0x16: floppy_1316(regs, drive); break;
733 default: floppy_13XX(regs, drive); break;
737 // INT 0Eh Diskette Hardware ISR Entry Point
741 debug_isr(DEBUG_ISR_0e);
742 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
743 outb(0x08, PORT_FD_DATA); // sense interrupt status
744 while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
748 } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
751 // diskette interrupt has occurred
752 SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
755 // Called from int08 handler.
759 // time to turn off drive(s)?
760 u8 fcount = GET_BDA(floppy_motor_counter);
763 SET_BDA(floppy_motor_counter, fcount);
766 outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);