![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to floppy.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Qemu by Fabrice Bellard] / qemu / roms / seabios / src|
Return to floppy.c CVS log | Up to [Qemu by Fabrice Bellard] / qemu / roms / seabios / src |
1.1 root 1: // 16bit code to access floppy drives.
2: //
3: // Copyright (C) 2008,2009 Kevin O'Connor <[email protected]>
4: // Copyright (C) 2002 MandrakeSoft S.A.
5: //
6: // This file may be distributed under the terms of the GNU LGPLv3 license.
7:
8: #include "types.h" // u8
9: #include "disk.h" // DISK_RET_SUCCESS
10: #include "config.h" // CONFIG_FLOPPY
11: #include "biosvar.h" // SET_BDA
12: #include "util.h" // wait_irq
13: #include "cmos.h" // inb_cmos
14: #include "pic.h" // eoi_pic1
15: #include "bregs.h" // struct bregs
1.1.1.5 root 16: #include "boot.h" // boot_add_floppy
17: #include "pci.h" // pci_to_bdf
18: #include "pci_ids.h" // PCI_CLASS_BRIDGE_ISA
1.1 root 19:
20: #define FLOPPY_SIZE_CODE 0x02 // 512 byte sectors
21: #define FLOPPY_DATALEN 0xff // Not used - because size code is 0x02
22: #define FLOPPY_MOTOR_TICKS 37 // ~2 seconds
23: #define FLOPPY_FILLBYTE 0xf6
24: #define FLOPPY_GAPLEN 0x1B
25: #define FLOPPY_FORMAT_GAPLEN 0x6c
26:
27: // New diskette parameter table adding 3 parameters from IBM
28: // Since no provisions are made for multiple drive types, most
29: // values in this table are ignored. I set parameters for 1.44M
30: // floppy here
31: struct floppy_ext_dbt_s diskette_param_table2 VAR16VISIBLE = {
32: .dbt = {
33: .specify1 = 0xAF, // step rate 12ms, head unload 240ms
34: .specify2 = 0x02, // head load time 4ms, DMA used
35: .shutoff_ticks = FLOPPY_MOTOR_TICKS, // ~2 seconds
36: .bps_code = FLOPPY_SIZE_CODE,
37: .sectors = 18,
38: .interblock_len = FLOPPY_GAPLEN,
39: .data_len = FLOPPY_DATALEN,
40: .gap_len = FLOPPY_FORMAT_GAPLEN,
41: .fill_byte = FLOPPY_FILLBYTE,
42: .settle_time = 0x0F, // 15ms
43: .startup_time = 0x08, // 1 second
44: },
45: .max_track = 79, // maximum track
46: .data_rate = 0, // data transfer rate
47: .drive_type = 4, // drive type in cmos
48: };
49:
50: // Since no provisions are made for multiple drive types, most
51: // values in this table are ignored. I set parameters for 1.44M
52: // floppy here
53: struct floppy_dbt_s diskette_param_table VAR16FIXED(0xefc7) = {
54: .specify1 = 0xAF,
55: .specify2 = 0x02,
56: .shutoff_ticks = FLOPPY_MOTOR_TICKS,
57: .bps_code = FLOPPY_SIZE_CODE,
58: .sectors = 18,
59: .interblock_len = FLOPPY_GAPLEN,
60: .data_len = FLOPPY_DATALEN,
61: .gap_len = FLOPPY_FORMAT_GAPLEN,
62: .fill_byte = FLOPPY_FILLBYTE,
63: .settle_time = 0x0F,
64: .startup_time = 0x08,
65: };
66:
67: struct floppyinfo_s {
68: struct chs_s chs;
69: u8 config_data;
70: u8 media_state;
71: };
72:
73: struct floppyinfo_s FloppyInfo[] VAR16VISIBLE = {
74: // Unknown
75: { {0, 0, 0}, 0x00, 0x00},
76: // 1 - 360KB, 5.25" - 2 heads, 40 tracks, 9 sectors
77: { {2, 40, 9}, 0x00, 0x25},
78: // 2 - 1.2MB, 5.25" - 2 heads, 80 tracks, 15 sectors
79: { {2, 80, 15}, 0x00, 0x25},
80: // 3 - 720KB, 3.5" - 2 heads, 80 tracks, 9 sectors
81: { {2, 80, 9}, 0x00, 0x17},
82: // 4 - 1.44MB, 3.5" - 2 heads, 80 tracks, 18 sectors
83: { {2, 80, 18}, 0x00, 0x17},
84: // 5 - 2.88MB, 3.5" - 2 heads, 80 tracks, 36 sectors
85: { {2, 80, 36}, 0xCC, 0xD7},
86: // 6 - 160k, 5.25" - 1 heads, 40 tracks, 8 sectors
87: { {1, 40, 8}, 0x00, 0x27},
88: // 7 - 180k, 5.25" - 1 heads, 40 tracks, 9 sectors
89: { {1, 40, 9}, 0x00, 0x27},
90: // 8 - 320k, 5.25" - 2 heads, 40 tracks, 8 sectors
91: { {2, 40, 8}, 0x00, 0x27},
92: };
93:
94: struct drive_s *
1.1.1.5 root 95: init_floppy(int floppyid, int ftype)
1.1 root 96: {
97: if (ftype <= 0 || ftype >= ARRAY_SIZE(FloppyInfo)) {
98: dprintf(1, "Bad floppy type %d\n", ftype);
99: return NULL;
100: }
101:
1.1.1.3 root 102: struct drive_s *drive_g = malloc_fseg(sizeof(*drive_g));
1.1.1.5 root 103: if (!drive_g) {
1.1.1.3 root 104: warn_noalloc();
1.1 root 105: return NULL;
1.1.1.3 root 106: }
107: memset(drive_g, 0, sizeof(*drive_g));
1.1 root 108: drive_g->cntl_id = floppyid;
1.1.1.5 root 109: drive_g->type = DTYPE_FLOPPY;
1.1 root 110: drive_g->blksize = DISK_SECTOR_SIZE;
111: drive_g->floppy_type = ftype;
112: drive_g->sectors = (u64)-1;
113:
114: memcpy(&drive_g->lchs, &FloppyInfo[ftype].chs
115: , sizeof(FloppyInfo[ftype].chs));
116: return drive_g;
117: }
118:
1.1.1.5 root 119: static void
120: addFloppy(int floppyid, int ftype)
121: {
122: struct drive_s *drive_g = init_floppy(floppyid, ftype);
123: if (!drive_g)
124: return;
125: char *desc = znprintf(MAXDESCSIZE, "Floppy [drive %c]", 'A' + floppyid);
1.1.1.6 ! root 126: struct pci_device *pci = pci_find_class(PCI_CLASS_BRIDGE_ISA); /* isa-to-pci bridge */
! 127: int prio = bootprio_find_fdc_device(pci, PORT_FD_BASE, floppyid);
1.1.1.5 root 128: boot_add_floppy(drive_g, desc, prio);
129: }
130:
1.1 root 131: void
1.1.1.2 root 132: floppy_setup(void)
1.1 root 133: {
134: if (! CONFIG_FLOPPY)
135: return;
136: dprintf(3, "init floppy drives\n");
137:
138: if (CONFIG_COREBOOT) {
139: // XXX - disable floppies on coreboot for now.
140: } else {
141: u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
142: if (type & 0xf0)
1.1.1.5 root 143: addFloppy(0, type >> 4);
1.1 root 144: if (type & 0x0f)
1.1.1.5 root 145: addFloppy(1, type & 0x0f);
1.1 root 146: }
147:
148: outb(0x02, PORT_DMA1_MASK_REG);
149:
1.1.1.4 root 150: enable_hwirq(6, FUNC16(entry_0e));
1.1 root 151: }
152:
153: // Find a floppy type that matches a given image size.
154: int
155: find_floppy_type(u32 size)
156: {
157: int i;
158: for (i=1; i<ARRAY_SIZE(FloppyInfo); i++) {
159: struct chs_s *c = &FloppyInfo[i].chs;
160: if (c->cylinders * c->heads * c->spt * DISK_SECTOR_SIZE == size)
161: return i;
162: }
163: return -1;
164: }
165:
166:
167: /****************************************************************
168: * Low-level floppy IO
169: ****************************************************************/
170:
171: static void
1.1.1.2 root 172: floppy_reset_controller(void)
1.1 root 173: {
174: // Reset controller
175: u8 val8 = inb(PORT_FD_DOR);
176: outb(val8 & ~0x04, PORT_FD_DOR);
177: outb(val8 | 0x04, PORT_FD_DOR);
178:
179: // Wait for controller to come out of reset
180: while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
181: ;
182: }
183:
184: static int
1.1.1.2 root 185: wait_floppy_irq(void)
1.1 root 186: {
187: ASSERT16();
188: u8 v;
189: for (;;) {
190: if (!GET_BDA(floppy_motor_counter))
191: return -1;
192: v = GET_BDA(floppy_recalibration_status);
193: if (v & FRS_TIMEOUT)
194: break;
1.1.1.3 root 195: // Could use wait_irq() here, but that causes issues on
196: // bochs, so use yield() instead.
197: yield();
1.1 root 198: }
199:
200: v &= ~FRS_TIMEOUT;
201: SET_BDA(floppy_recalibration_status, v);
202: return 0;
203: }
204:
205: static void
206: floppy_prepare_controller(u8 floppyid)
207: {
208: CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
209:
210: // turn on motor of selected drive, DMA & int enabled, normal operation
211: u8 prev_reset = inb(PORT_FD_DOR) & 0x04;
212: u8 dor = 0x10;
213: if (floppyid)
214: dor = 0x20;
215: dor |= 0x0c;
216: dor |= floppyid;
217: outb(dor, PORT_FD_DOR);
218:
219: // reset the disk motor timeout value of INT 08
220: SET_BDA(floppy_motor_counter, FLOPPY_MOTOR_TICKS);
221:
222: // wait for drive readiness
223: while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
224: ;
225:
226: if (!prev_reset)
227: wait_floppy_irq();
228: }
229:
230: static int
231: floppy_pio(u8 *cmd, u8 cmdlen)
232: {
233: floppy_prepare_controller(cmd[1] & 1);
234:
235: // send command to controller
236: u8 i;
237: for (i=0; i<cmdlen; i++)
238: outb(cmd[i], PORT_FD_DATA);
239:
240: int ret = wait_floppy_irq();
241: if (ret) {
242: floppy_reset_controller();
243: return -1;
244: }
245:
246: return 0;
247: }
248:
249: static int
250: floppy_cmd(struct disk_op_s *op, u16 count, u8 *cmd, u8 cmdlen)
251: {
252: // es:bx = pointer to where to place information from diskette
253: u32 addr = (u32)op->buf_fl;
254:
255: // check for 64K boundary overrun
256: u16 end = count - 1;
257: u32 last_addr = addr + end;
258: if ((addr >> 16) != (last_addr >> 16))
259: return DISK_RET_EBOUNDARY;
260:
261: u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
262: if (cmd[0] == 0xe6)
263: // read
264: mode_register = 0x46;
265:
266: //DEBUGF("floppy dma c2\n");
267: outb(0x06, PORT_DMA1_MASK_REG);
268: outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
269: outb(addr, PORT_DMA_ADDR_2);
270: outb(addr>>8, PORT_DMA_ADDR_2);
271: outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
272: outb(end, PORT_DMA_CNT_2);
273: outb(end>>8, PORT_DMA_CNT_2);
274:
275: // port 0b: DMA-1 Mode Register
276: // transfer type=write, channel 2
277: outb(mode_register, PORT_DMA1_MODE_REG);
278:
279: // port 81: DMA-1 Page Register, channel 2
280: outb(addr>>16, PORT_DMA_PAGE_2);
281:
282: outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
283:
284: int ret = floppy_pio(cmd, cmdlen);
285: if (ret)
286: return DISK_RET_ETIMEOUT;
287:
288: // check port 3f4 for accessibility to status bytes
289: if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
290: return DISK_RET_ECONTROLLER;
291:
292: // read 7 return status bytes from controller
293: u8 i;
294: for (i=0; i<7; i++) {
295: u8 v = inb(PORT_FD_DATA);
296: cmd[i] = v;
297: SET_BDA(floppy_return_status[i], v);
298: }
299:
300: return DISK_RET_SUCCESS;
301: }
302:
303:
304: /****************************************************************
305: * Floppy media sense
306: ****************************************************************/
307:
308: static inline void
309: set_diskette_current_cyl(u8 floppyid, u8 cyl)
310: {
311: SET_BDA(floppy_track[floppyid], cyl);
312: }
313:
314: static void
315: floppy_drive_recal(u8 floppyid)
316: {
317: // send Recalibrate command (2 bytes) to controller
318: u8 data[12];
319: data[0] = 0x07; // 07: Recalibrate
320: data[1] = floppyid; // 0=drive0, 1=drive1
321: floppy_pio(data, 2);
322:
323: SETBITS_BDA(floppy_recalibration_status, 1<<floppyid);
324: set_diskette_current_cyl(floppyid, 0);
325: }
326:
327: static int
328: floppy_media_sense(struct drive_s *drive_g)
329: {
330: // for now cheat and get drive type from CMOS,
331: // assume media is same as drive type
332:
333: // ** config_data **
334: // Bitfields for diskette media control:
335: // Bit(s) Description (Table M0028)
336: // 7-6 last data rate set by controller
337: // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
338: // 5-4 last diskette drive step rate selected
339: // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
340: // 3-2 {data rate at start of operation}
341: // 1-0 reserved
342:
343: // ** media_state **
344: // Bitfields for diskette drive media state:
345: // Bit(s) Description (Table M0030)
346: // 7-6 data rate
347: // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
348: // 5 double stepping required (e.g. 360kB in 1.2MB)
349: // 4 media type established
350: // 3 drive capable of supporting 4MB media
351: // 2-0 on exit from BIOS, contains
352: // 000 trying 360kB in 360kB
353: // 001 trying 360kB in 1.2MB
354: // 010 trying 1.2MB in 1.2MB
355: // 011 360kB in 360kB established
356: // 100 360kB in 1.2MB established
357: // 101 1.2MB in 1.2MB established
358: // 110 reserved
359: // 111 all other formats/drives
360:
361: u8 ftype = GET_GLOBAL(drive_g->floppy_type);
362: SET_BDA(floppy_last_data_rate, GET_GLOBAL(FloppyInfo[ftype].config_data));
363: u8 floppyid = GET_GLOBAL(drive_g->cntl_id);
364: SET_BDA(floppy_media_state[floppyid]
365: , GET_GLOBAL(FloppyInfo[ftype].media_state));
366: return DISK_RET_SUCCESS;
367: }
368:
369: static int
370: check_recal_drive(struct drive_s *drive_g)
371: {
372: u8 floppyid = GET_GLOBAL(drive_g->cntl_id);
373: if ((GET_BDA(floppy_recalibration_status) & (1<<floppyid))
374: && (GET_BDA(floppy_media_state[floppyid]) & FMS_MEDIA_DRIVE_ESTABLISHED))
375: // Media is known.
376: return DISK_RET_SUCCESS;
377:
378: // Recalibrate drive.
379: floppy_drive_recal(floppyid);
380:
381: // Sense media.
382: return floppy_media_sense(drive_g);
383: }
384:
385:
386: /****************************************************************
387: * Floppy handlers
388: ****************************************************************/
389:
390: static void
391: lba2chs(struct disk_op_s *op, u8 *track, u8 *sector, u8 *head)
392: {
393: u32 lba = op->lba;
394:
395: u32 tmp = lba + 1;
396: u16 nlspt = GET_GLOBAL(op->drive_g->lchs.spt);
397: *sector = tmp % nlspt;
398:
399: tmp /= nlspt;
400: u16 nlh = GET_GLOBAL(op->drive_g->lchs.heads);
401: *head = tmp % nlh;
402:
403: tmp /= nlh;
404: *track = tmp;
405: }
406:
407: // diskette controller reset
408: static int
409: floppy_reset(struct disk_op_s *op)
410: {
411: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
412: set_diskette_current_cyl(floppyid, 0); // current cylinder
413: return DISK_RET_SUCCESS;
414: }
415:
416: // Read Diskette Sectors
417: static int
418: floppy_read(struct disk_op_s *op)
419: {
420: int res = check_recal_drive(op->drive_g);
421: if (res)
422: goto fail;
423:
424: u8 track, sector, head;
425: lba2chs(op, &track, §or, &head);
426:
427: // send read-normal-data command (9 bytes) to controller
428: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
429: u8 data[12];
430: data[0] = 0xe6; // e6: read normal data
431: data[1] = (head << 2) | floppyid; // HD DR1 DR2
432: data[2] = track;
433: data[3] = head;
434: data[4] = sector;
435: data[5] = FLOPPY_SIZE_CODE;
436: data[6] = sector + op->count - 1; // last sector to read on track
437: data[7] = FLOPPY_GAPLEN;
438: data[8] = FLOPPY_DATALEN;
439:
440: res = floppy_cmd(op, op->count * DISK_SECTOR_SIZE, data, 9);
441: if (res)
442: goto fail;
443:
444: if (data[0] & 0xc0) {
445: res = DISK_RET_ECONTROLLER;
446: goto fail;
447: }
448:
449: // ??? should track be new val from return_status[3] ?
450: set_diskette_current_cyl(floppyid, track);
451: return DISK_RET_SUCCESS;
452: fail:
453: op->count = 0; // no sectors read
454: return res;
455: }
456:
457: // Write Diskette Sectors
458: static int
459: floppy_write(struct disk_op_s *op)
460: {
461: int res = check_recal_drive(op->drive_g);
462: if (res)
463: goto fail;
464:
465: u8 track, sector, head;
466: lba2chs(op, &track, §or, &head);
467:
468: // send write-normal-data command (9 bytes) to controller
469: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
470: u8 data[12];
471: data[0] = 0xc5; // c5: write normal data
472: data[1] = (head << 2) | floppyid; // HD DR1 DR2
473: data[2] = track;
474: data[3] = head;
475: data[4] = sector;
476: data[5] = FLOPPY_SIZE_CODE;
477: data[6] = sector + op->count - 1; // last sector to write on track
478: data[7] = FLOPPY_GAPLEN;
479: data[8] = FLOPPY_DATALEN;
480:
481: res = floppy_cmd(op, op->count * DISK_SECTOR_SIZE, data, 9);
482: if (res)
483: goto fail;
484:
485: if (data[0] & 0xc0) {
486: if (data[1] & 0x02)
487: res = DISK_RET_EWRITEPROTECT;
488: else
489: res = DISK_RET_ECONTROLLER;
490: goto fail;
491: }
492:
493: // ??? should track be new val from return_status[3] ?
494: set_diskette_current_cyl(floppyid, track);
495: return DISK_RET_SUCCESS;
496: fail:
497: op->count = 0; // no sectors read
498: return res;
499: }
500:
501: // Verify Diskette Sectors
502: static int
503: floppy_verify(struct disk_op_s *op)
504: {
505: int res = check_recal_drive(op->drive_g);
506: if (res)
507: goto fail;
508:
509: u8 track, sector, head;
510: lba2chs(op, &track, §or, &head);
511:
512: // ??? should track be new val from return_status[3] ?
513: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
514: set_diskette_current_cyl(floppyid, track);
515: return DISK_RET_SUCCESS;
516: fail:
517: op->count = 0; // no sectors read
518: return res;
519: }
520:
521: // format diskette track
522: static int
523: floppy_format(struct disk_op_s *op)
524: {
525: int ret = check_recal_drive(op->drive_g);
526: if (ret)
527: return ret;
528:
529: u8 head = op->lba;
530:
531: // send format-track command (6 bytes) to controller
532: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
533: u8 data[12];
534: data[0] = 0x4d; // 4d: format track
535: data[1] = (head << 2) | floppyid; // HD DR1 DR2
536: data[2] = FLOPPY_SIZE_CODE;
537: data[3] = op->count; // number of sectors per track
538: data[4] = FLOPPY_FORMAT_GAPLEN;
539: data[5] = FLOPPY_FILLBYTE;
540:
541: ret = floppy_cmd(op, op->count * 4, data, 6);
542: if (ret)
543: return ret;
544:
545: if (data[0] & 0xc0) {
546: if (data[1] & 0x02)
547: return DISK_RET_EWRITEPROTECT;
548: return DISK_RET_ECONTROLLER;
549: }
550:
551: set_diskette_current_cyl(floppyid, 0);
552: return DISK_RET_SUCCESS;
553: }
554:
555: int
556: process_floppy_op(struct disk_op_s *op)
557: {
558: if (!CONFIG_FLOPPY)
559: return 0;
560:
561: switch (op->command) {
562: case CMD_RESET:
563: return floppy_reset(op);
564: case CMD_READ:
565: return floppy_read(op);
566: case CMD_WRITE:
567: return floppy_write(op);
568: case CMD_VERIFY:
569: return floppy_verify(op);
570: case CMD_FORMAT:
571: return floppy_format(op);
572: default:
573: op->count = 0;
574: return DISK_RET_EPARAM;
575: }
576: }
577:
578:
579: /****************************************************************
580: * HW irqs
581: ****************************************************************/
582:
583: // INT 0Eh Diskette Hardware ISR Entry Point
584: void VISIBLE16
1.1.1.2 root 585: handle_0e(void)
1.1 root 586: {
587: debug_isr(DEBUG_ISR_0e);
588: if (! CONFIG_FLOPPY)
589: goto done;
590:
591: if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
592: outb(0x08, PORT_FD_DATA); // sense interrupt status
593: while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
594: ;
595: do {
596: inb(PORT_FD_DATA);
597: } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
598: }
599: // diskette interrupt has occurred
600: SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
601:
602: done:
603: eoi_pic1();
604: }
605:
606: // Called from int08 handler.
607: void
1.1.1.2 root 608: floppy_tick(void)
1.1 root 609: {
610: if (! CONFIG_FLOPPY)
611: return;
612:
613: // time to turn off drive(s)?
614: u8 fcount = GET_BDA(floppy_motor_counter);
615: if (fcount) {
616: fcount--;
617: SET_BDA(floppy_motor_counter, fcount);
618: if (fcount == 0)
619: // turn motor(s) off
620: outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);
621: }
622: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.