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
24 struct floppy_ext_dbt_s diskette_param_table2 VISIBLE16 = {
27 .specify2 = 0x02, // head load time 0000001, DMA used
28 .shutoff_ticks = 0x25,
31 .interblock_len = 0x1B,
38 .max_track = 79, // maximum track
39 .data_rate = 0, // data transfer rate
40 .drive_type = 4, // drive type in cmos
47 if (! CONFIG_FLOPPY_SUPPORT)
49 dprintf(3, "init floppy drives\n");
51 // XXX - disable floppies on coreboot for now.
52 outb_cmos(0, CMOS_FLOPPY_DRIVE_TYPE);
53 u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
65 SET_BDA(floppy_harddisk_info, out);
67 // Update equipment word bits for floppy
68 if (num_floppies == 1)
69 // 1 drive, ready for boot
70 SETBITS_BDA(equipment_list_flags, 0x01);
71 else if (num_floppies == 2)
72 // 2 drives, ready for boot
73 SETBITS_BDA(equipment_list_flags, 0x41);
75 outb(0x02, PORT_DMA1_MASK_REG);
77 // Enable IRQ6 (handle_0e)
78 unmask_pic1(PIC1_IRQ6);
82 set_diskette_current_cyl(u8 drive, u8 cyl)
85 SET_BDA(floppy_track1, cyl);
87 SET_BDA(floppy_track0, cyl);
91 get_drive_type(u8 drive)
93 // check CMOS to see if drive exists
94 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
103 floppy_media_known(u8 drive)
105 if (!(GET_BDA(floppy_recalibration_status) & (1<<drive)))
107 u8 v = GET_BDA(floppy_media_state[drive]);
108 if (!(v & FMS_MEDIA_DRIVE_ESTABLISHED))
114 floppy_reset_controller()
117 u8 val8 = inb(PORT_FD_DOR);
118 outb(val8 & ~0x04, PORT_FD_DOR);
119 outb(val8 | 0x04, PORT_FD_DOR);
121 // Wait for controller to come out of reset
122 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
127 floppy_prepare_controller(u8 drive)
129 CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
131 // turn on motor of selected drive, DMA & int enabled, normal operation
132 u8 prev_reset = inb(PORT_FD_DOR) & 0x04;
138 outb(dor, PORT_FD_DOR);
140 // reset the disk motor timeout value of INT 08
141 SET_BDA(floppy_motor_counter, BX_FLOPPY_ON_CNT);
143 // wait for drive readiness
144 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
147 if (prev_reset == 0) {
151 v = GET_BDA(floppy_recalibration_status);
159 SET_BDA(floppy_recalibration_status, v);
164 floppy_pio(u8 *cmd, u8 cmdlen)
166 floppy_prepare_controller(cmd[1] & 1);
168 // send command to controller
170 for (i=0; i<cmdlen; i++)
171 outb(cmd[i], PORT_FD_DATA);
176 if (!GET_BDA(floppy_motor_counter)) {
178 floppy_reset_controller();
181 v = GET_BDA(floppy_recalibration_status);
189 SET_BDA(floppy_recalibration_status, v);
194 #define floppy_ret(regs, code) \
195 __floppy_ret(__func__, __LINE__, (regs), (code))
198 __floppy_ret(const char *fname, int lineno, struct bregs *regs, u8 code)
200 SET_BDA(floppy_last_status, code);
202 __set_code_fail(fname, lineno, regs, code);
204 set_code_success(regs);
208 floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen)
210 // es:bx = pointer to where to place information from diskette
211 u32 addr = (u32)MAKE_FARPTR(regs->es, regs->bx);
213 // check for 64K boundary overrun
214 u32 last_addr = addr + count;
215 if ((addr >> 16) != (last_addr >> 16)) {
216 floppy_ret(regs, DISK_RET_EBOUNDARY);
220 u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
223 mode_register = 0x46;
225 //DEBUGF("floppy dma c2\n");
226 outb(0x06, PORT_DMA1_MASK_REG);
227 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
228 outb(addr, PORT_DMA_ADDR_2);
229 outb(addr>>8, PORT_DMA_ADDR_2);
230 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
231 outb(count, PORT_DMA_CNT_2);
232 outb(count>>8, PORT_DMA_CNT_2);
234 // port 0b: DMA-1 Mode Register
235 // transfer type=write, channel 2
236 outb(mode_register, PORT_DMA1_MODE_REG);
238 // port 81: DMA-1 Page Register, channel 2
239 outb(addr>>16, PORT_DMA_PAGE_2);
241 outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
243 int ret = floppy_pio(cmd, cmdlen);
245 floppy_ret(regs, DISK_RET_ETIMEOUT);
249 // check port 3f4 for accessibility to status bytes
250 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
251 BX_PANIC("int13_diskette: ctrl not ready\n");
253 // read 7 return status bytes from controller
255 for (i=0; i<7; i++) {
256 u8 v = inb(PORT_FD_DATA);
258 SET_BDA(floppy_return_status[i], v);
265 floppy_drive_recal(u8 drive)
267 // send Recalibrate command (2 bytes) to controller
269 data[0] = 0x07; // 07: Recalibrate
270 data[1] = drive; // 0=drive0, 1=drive1
273 SETBITS_BDA(floppy_recalibration_status, 1<<drive);
274 set_diskette_current_cyl(drive, 0);
278 floppy_media_sense(u8 drive)
281 u8 config_data, media_state;
283 floppy_drive_recal(drive);
285 // for now cheat and get drive type from CMOS,
286 // assume media is same as drive type
289 // Bitfields for diskette media control:
290 // Bit(s) Description (Table M0028)
291 // 7-6 last data rate set by controller
292 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
293 // 5-4 last diskette drive step rate selected
294 // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
295 // 3-2 {data rate at start of operation}
299 // Bitfields for diskette drive media state:
300 // Bit(s) Description (Table M0030)
302 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
303 // 5 double stepping required (e.g. 360kB in 1.2MB)
304 // 4 media type established
305 // 3 drive capable of supporting 4MB media
306 // 2-0 on exit from BIOS, contains
307 // 000 trying 360kB in 360kB
308 // 001 trying 360kB in 1.2MB
309 // 010 trying 1.2MB in 1.2MB
310 // 011 360kB in 360kB established
311 // 100 360kB in 1.2MB established
312 // 101 1.2MB in 1.2MB established
314 // 111 all other formats/drives
316 switch (get_drive_type(drive)) {
319 config_data = 0x00; // 0000 0000
320 media_state = 0x25; // 0010 0101
324 // 1.2 MB 5.25" drive
325 config_data = 0x00; // 0000 0000
326 media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5)
331 config_data = 0x00; // 0000 0000 ???
332 media_state = 0x17; // 0001 0111
336 // 1.44 MB 3.5" drive
337 config_data = 0x00; // 0000 0000
338 media_state = 0x17; // 0001 0111
342 // 2.88 MB 3.5" drive
343 config_data = 0xCC; // 1100 1100
344 media_state = 0xD7; // 1101 0111
348 // Extended floppy size uses special cmos setting
351 config_data = 0x00; // 0000 0000
352 media_state = 0x27; // 0010 0111
357 config_data = 0x00; // 0000 0000
358 media_state = 0x27; // 0010 0111
363 config_data = 0x00; // 0000 0000
364 media_state = 0x27; // 0010 0111
369 config_data = 0x00; // 0000 0000
370 media_state = 0x00; // 0000 0000
374 SET_BDA(floppy_last_data_rate, config_data);
375 SET_BDA(floppy_media_state[drive], media_state);
380 check_drive(struct bregs *regs, u8 drive)
382 // see if drive exists
383 if (drive > 1 || !get_drive_type(drive)) {
384 // XXX - return type doesn't match
385 floppy_ret(regs, DISK_RET_ETIMEOUT);
389 // see if media in drive, and type is known
390 if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) {
391 floppy_ret(regs, DISK_RET_EMEDIA);
397 // diskette controller reset
399 floppy_1300(struct bregs *regs, u8 drive)
402 floppy_ret(regs, DISK_RET_EPARAM);
405 if (!get_drive_type(drive)) {
406 floppy_ret(regs, DISK_RET_ETIMEOUT);
409 set_diskette_current_cyl(drive, 0); // current cylinder
410 floppy_ret(regs, DISK_RET_SUCCESS);
413 // Read Diskette Status
415 floppy_1301(struct bregs *regs, u8 drive)
417 u8 v = GET_BDA(floppy_last_status);
422 // Read Diskette Sectors
424 floppy_1302(struct bregs *regs, u8 drive)
426 if (check_drive(regs, drive))
429 u8 num_sectors = regs->al;
431 u8 sector = regs->cl;
434 if (head > 1 || sector == 0 || num_sectors == 0
435 || track > 79 || num_sectors > 72) {
436 floppy_ret(regs, DISK_RET_EPARAM);
440 // send read-normal-data command (9 bytes) to controller
442 data[0] = 0xe6; // e6: read normal data
443 data[1] = (head << 2) | drive; // HD DR1 DR2
447 data[5] = 2; // 512 byte sector size
448 data[6] = sector + num_sectors - 1; // last sector to read on track
449 data[7] = 0; // Gap length
450 data[8] = 0xff; // Gap length
452 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
456 if (data[0] & 0xc0) {
457 floppy_ret(regs, DISK_RET_ECONTROLLER);
461 // ??? should track be new val from return_status[3] ?
462 set_diskette_current_cyl(drive, track);
463 // AL = number of sectors read (same value as passed)
464 floppy_ret(regs, DISK_RET_SUCCESS);
467 regs->al = 0; // no sectors read
470 // Write Diskette Sectors
472 floppy_1303(struct bregs *regs, u8 drive)
474 if (check_drive(regs, drive))
477 u8 num_sectors = regs->al;
479 u8 sector = regs->cl;
482 if (head > 1 || sector == 0 || num_sectors == 0
483 || track > 79 || num_sectors > 72) {
484 floppy_ret(regs, DISK_RET_EPARAM);
488 // send write-normal-data command (9 bytes) to controller
490 data[0] = 0xc5; // c5: write normal data
491 data[1] = (head << 2) | drive; // HD DR1 DR2
495 data[5] = 2; // 512 byte sector size
496 data[6] = sector + num_sectors - 1; // last sector to write on track
497 data[7] = 0; // Gap length
498 data[8] = 0xff; // Gap length
500 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
504 if (data[0] & 0xc0) {
505 if (data[1] & 0x02) {
506 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
509 BX_PANIC("int13_diskette_function: read error\n");
512 // ??? should track be new val from return_status[3] ?
513 set_diskette_current_cyl(drive, track);
514 // AL = number of sectors read (same value as passed)
515 floppy_ret(regs, DISK_RET_SUCCESS);
518 regs->al = 0; // no sectors read
521 // Verify Diskette Sectors
523 floppy_1304(struct bregs *regs, u8 drive)
525 if (check_drive(regs, drive))
528 u8 num_sectors = regs->al;
530 u8 sector = regs->cl;
533 if (head > 1 || sector == 0 || num_sectors == 0
534 || track > 79 || num_sectors > 72) {
535 floppy_ret(regs, DISK_RET_EPARAM);
539 // ??? should track be new val from return_status[3] ?
540 set_diskette_current_cyl(drive, track);
541 // AL = number of sectors verified (same value as passed)
542 floppy_ret(regs, DISK_RET_SUCCESS);
545 regs->al = 0; // no sectors read
548 // format diskette track
550 floppy_1305(struct bregs *regs, u8 drive)
552 dprintf(3, "floppy f05\n");
554 if (check_drive(regs, drive))
557 u8 num_sectors = regs->al;
560 if (head > 1 || num_sectors == 0 || num_sectors > 18) {
561 floppy_ret(regs, DISK_RET_EPARAM);
565 // send format-track command (6 bytes) to controller
567 data[0] = 0x4d; // 4d: format track
568 data[1] = (head << 2) | drive; // HD DR1 DR2
569 data[2] = 2; // 512 byte sector size
570 data[3] = num_sectors; // number of sectors per track
571 data[4] = 0; // Gap length
572 data[5] = 0xf6; // Fill byte
574 int ret = floppy_cmd(regs, (num_sectors * 4) - 1, data, 6);
578 if (data[0] & 0xc0) {
579 if (data[1] & 0x02) {
580 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
583 BX_PANIC("int13_diskette_function: read error\n");
586 set_diskette_current_cyl(drive, 0);
590 // read diskette drive parameters
592 floppy_1308(struct bregs *regs, u8 drive)
594 dprintf(3, "floppy f08\n");
596 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
598 if (drive_type & 0xf0)
600 if (drive_type & 0x0f)
610 regs->dl = num_floppies;
621 regs->bl = drive_type;
624 regs->dl = num_floppies;
626 switch (drive_type) {
629 regs->dh = 0; // max head #
632 case 1: // 360KB, 5.25"
633 regs->cx = 0x2709; // 40 tracks, 9 sectors
634 regs->dh = 1; // max head #
637 case 2: // 1.2MB, 5.25"
638 regs->cx = 0x4f0f; // 80 tracks, 15 sectors
639 regs->dh = 1; // max head #
642 case 3: // 720KB, 3.5"
643 regs->cx = 0x4f09; // 80 tracks, 9 sectors
644 regs->dh = 1; // max head #
647 case 4: // 1.44MB, 3.5"
648 regs->cx = 0x4f12; // 80 tracks, 18 sectors
649 regs->dh = 1; // max head #
652 case 5: // 2.88MB, 3.5"
653 regs->cx = 0x4f24; // 80 tracks, 36 sectors
654 regs->dh = 1; // max head #
657 case 6: // 160k, 5.25"
658 regs->cx = 0x2708; // 40 tracks, 8 sectors
659 regs->dh = 0; // max head #
662 case 7: // 180k, 5.25"
663 regs->cx = 0x2709; // 40 tracks, 9 sectors
664 regs->dh = 0; // max head #
667 case 8: // 320k, 5.25"
668 regs->cx = 0x2708; // 40 tracks, 8 sectors
669 regs->dh = 1; // max head #
673 BX_PANIC("floppy: int13: bad floppy type\n");
676 /* set es & di to point to 11 byte diskette param table in ROM */
678 regs->di = (u32)&diskette_param_table2;
679 /* disk status not changed upon success */
683 // read diskette drive type
685 floppy_1315(struct bregs *regs, u8 drive)
687 dprintf(6, "floppy f15\n");
690 regs->ah = 0; // only 2 drives supported
691 // set_diskette_ret_status here ???
694 u8 drive_type = get_drive_type(drive);
696 regs->ah = (drive_type != 0);
700 // get diskette change line status
702 floppy_1316(struct bregs *regs, u8 drive)
705 floppy_ret(regs, DISK_RET_EPARAM);
708 floppy_ret(regs, DISK_RET_ECHANGED);
712 floppy_13XX(struct bregs *regs, u8 drive)
714 floppy_ret(regs, DISK_RET_EPARAM);
718 floppy_13(struct bregs *regs, u8 drive)
720 if (! CONFIG_FLOPPY_SUPPORT) {
723 case 0x01: floppy_1301(regs, drive); break;
724 default: floppy_13XX(regs, drive); break;
729 case 0x00: floppy_1300(regs, drive); break;
730 case 0x01: floppy_1301(regs, drive); break;
731 case 0x02: floppy_1302(regs, drive); break;
732 case 0x03: floppy_1303(regs, drive); break;
733 case 0x04: floppy_1304(regs, drive); break;
734 case 0x05: floppy_1305(regs, drive); break;
735 case 0x08: floppy_1308(regs, drive); break;
736 case 0x15: floppy_1315(regs, drive); break;
737 case 0x16: floppy_1316(regs, drive); break;
738 default: floppy_13XX(regs, drive); break;
742 // INT 0Eh Diskette Hardware ISR Entry Point
746 debug_isr(DEBUG_ISR_0e);
747 if (! CONFIG_FLOPPY_SUPPORT)
750 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
751 outb(0x08, PORT_FD_DATA); // sense interrupt status
752 while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
756 } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
758 // diskette interrupt has occurred
759 SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
765 // Called from int08 handler.
769 if (! CONFIG_FLOPPY_SUPPORT)
772 // time to turn off drive(s)?
773 u8 fcount = GET_BDA(floppy_motor_counter);
776 SET_BDA(floppy_motor_counter, fcount);
779 outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);