1 // 16bit code to access cdrom drives.
3 // Copyright (C) 2008,2009 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 LGPLv3 license.
8 #include "disk.h" // cdrom_13
9 #include "util.h" // memset
10 #include "bregs.h" // struct bregs
11 #include "biosvar.h" // GET_EBDA
12 #include "ata.h" // ATA_CMD_REQUEST_SENSE
15 /****************************************************************
17 ****************************************************************/
19 // read disk drive size
21 cdrom_1315(struct bregs *regs, u8 driveid)
23 disk_ret(regs, DISK_RET_EADDRNOTFOUND);
28 cdrom_134500(struct bregs *regs, u8 driveid)
30 u16 ebda_seg = get_ebda_seg();
31 u8 locks = GET_EBDA2(ebda_seg, cdrom_locks[driveid]);
34 disk_ret(regs, DISK_RET_ETOOMANYLOCKS);
37 SET_EBDA2(ebda_seg, cdrom_locks[driveid], locks + 1);
39 disk_ret(regs, DISK_RET_SUCCESS);
44 cdrom_134501(struct bregs *regs, u8 driveid)
46 u16 ebda_seg = get_ebda_seg();
47 u8 locks = GET_EBDA2(ebda_seg, cdrom_locks[driveid]);
50 disk_ret(regs, DISK_RET_ENOTLOCKED);
54 SET_EBDA2(ebda_seg, cdrom_locks[driveid], locks);
55 regs->al = (locks ? 1 : 0);
56 disk_ret(regs, DISK_RET_SUCCESS);
61 cdrom_134502(struct bregs *regs, u8 driveid)
63 u8 locks = GET_EBDA(cdrom_locks[driveid]);
64 regs->al = (locks ? 1 : 0);
65 disk_ret(regs, DISK_RET_SUCCESS);
69 cdrom_1345XX(struct bregs *regs, u8 driveid)
71 disk_ret(regs, DISK_RET_EPARAM);
74 // IBM/MS lock/unlock drive
76 cdrom_1345(struct bregs *regs, u8 driveid)
79 case 0x00: cdrom_134500(regs, driveid); break;
80 case 0x01: cdrom_134501(regs, driveid); break;
81 case 0x02: cdrom_134502(regs, driveid); break;
82 default: cdrom_1345XX(regs, driveid); break;
88 cdrom_1346(struct bregs *regs, u8 driveid)
90 u8 locks = GET_EBDA(cdrom_locks[driveid]);
92 disk_ret(regs, DISK_RET_ELOCKED);
96 // FIXME should handle 0x31 no media in device
97 // FIXME should handle 0xb5 valid request failed
99 // Call removable media eject
101 memset(&br, 0, sizeof(br));
103 call16_int(0x15, &br);
105 if (br.ah || br.flags & F_CF) {
106 disk_ret(regs, DISK_RET_ELOCKED);
109 disk_ret(regs, DISK_RET_SUCCESS);
112 // IBM/MS extended media change
114 cdrom_1349(struct bregs *regs, u8 driveid)
117 // always send changed ??
118 regs->ah = DISK_RET_ECHANGED;
122 cdrom_ok(struct bregs *regs, u8 driveid)
124 disk_ret(regs, DISK_RET_SUCCESS);
128 cdrom_wp(struct bregs *regs, u8 driveid)
130 disk_ret(regs, DISK_RET_EWRITEPROTECT);
134 cdrom_13(struct bregs *regs, u8 driveid)
139 case 0x15: cdrom_1315(regs, driveid); break;
140 case 0x45: cdrom_1345(regs, driveid); break;
141 case 0x46: cdrom_1346(regs, driveid); break;
142 case 0x49: cdrom_1349(regs, driveid); break;
144 // These functions are the same as for hard disks
152 disk_13(regs, driveid);
155 // all these functions return SUCCESS
156 case 0x00: // disk controller reset
157 case 0x09: // initialize drive parameters
158 case 0x0c: // seek to specified cylinder
159 case 0x0d: // alternate disk reset
160 case 0x10: // check drive ready
161 case 0x11: // recalibrate
162 case 0x14: // controller internal diagnostic
163 case 0x16: // detect disk change
164 cdrom_ok(regs, driveid);
167 // all these functions return disk write-protected
168 case 0x03: // write disk sectors
169 case 0x05: // format disk track
170 case 0x43: // IBM/MS extended write
171 cdrom_wp(regs, driveid);
174 default: disk_13XX(regs, driveid); break;
179 /****************************************************************
181 ****************************************************************/
184 cdemu_1302(struct bregs *regs, u8 driveid)
186 cdemu_access(regs, driveid, CMD_READ);
190 cdemu_1304(struct bregs *regs, u8 driveid)
192 cdemu_access(regs, driveid, CMD_VERIFY);
195 // read disk drive parameters
197 cdemu_1308(struct bregs *regs, u8 driveid)
199 u16 ebda_seg = get_ebda_seg();
200 u16 nlc = GET_EBDA2(ebda_seg, cdemu.lchs.cylinders) - 1;
201 u16 nlh = GET_EBDA2(ebda_seg, cdemu.lchs.heads) - 1;
202 u16 nlspt = GET_EBDA2(ebda_seg, cdemu.lchs.spt);
206 regs->ch = nlc & 0xff;
207 regs->cl = ((nlc >> 2) & 0xc0) | (nlspt & 0x3f);
209 // FIXME ElTorito Various. should send the real count of drives 1 or 2
210 // FIXME ElTorito Harddisk. should send the HD count
212 u8 media = GET_EBDA2(ebda_seg, cdemu.media);
214 regs->bl = media * 2;
217 regs->di = (u32)&diskette_param_table2;
219 disk_ret(regs, DISK_RET_SUCCESS);
223 cdemu_13(struct bregs *regs)
227 u16 ebda_seg = get_ebda_seg();
228 u8 driveid = GET_EBDA2(ebda_seg, cdemu.controller_index) * 2;
229 driveid += GET_EBDA2(ebda_seg, cdemu.device_spec);
232 case 0x02: cdemu_1302(regs, driveid); break;
233 case 0x04: cdemu_1304(regs, driveid); break;
234 case 0x08: cdemu_1308(regs, driveid); break;
236 // These functions are the same as standard CDROM.
249 cdrom_13(regs, driveid);
252 default: disk_13XX(regs, driveid); break;
271 #define SET_INT13ET(regs,var,val) \
272 SET_FARVAR((regs)->ds, ((struct eltorito_s*)((regs)->si+0))->var, (val))
274 // ElTorito - Terminate disk emu
276 cdemu_134b(struct bregs *regs)
278 // FIXME ElTorito Hardcoded
279 u16 ebda_seg = get_ebda_seg();
280 SET_INT13ET(regs, size, 0x13);
281 SET_INT13ET(regs, media, GET_EBDA2(ebda_seg, cdemu.media));
282 SET_INT13ET(regs, emulated_drive, GET_EBDA2(ebda_seg, cdemu.emulated_drive));
283 SET_INT13ET(regs, controller_index
284 , GET_EBDA2(ebda_seg, cdemu.controller_index));
285 SET_INT13ET(regs, ilba, GET_EBDA2(ebda_seg, cdemu.ilba));
286 SET_INT13ET(regs, device_spec, GET_EBDA2(ebda_seg, cdemu.device_spec));
287 SET_INT13ET(regs, buffer_segment, GET_EBDA2(ebda_seg, cdemu.buffer_segment));
288 SET_INT13ET(regs, load_segment, GET_EBDA2(ebda_seg, cdemu.load_segment));
289 SET_INT13ET(regs, sector_count, GET_EBDA2(ebda_seg, cdemu.sector_count));
290 SET_INT13ET(regs, cylinders, GET_EBDA2(ebda_seg, cdemu.lchs.cylinders));
291 SET_INT13ET(regs, sectors, GET_EBDA2(ebda_seg, cdemu.lchs.spt));
292 SET_INT13ET(regs, heads, GET_EBDA2(ebda_seg, cdemu.lchs.heads));
294 // If we have to terminate emulation
295 if (regs->al == 0x00) {
296 // FIXME ElTorito Various. Should be handled accordingly to spec
297 SET_EBDA2(ebda_seg, cdemu.active, 0x00); // bye bye
300 disk_ret(regs, DISK_RET_SUCCESS);
304 /****************************************************************
306 ****************************************************************/
310 atapi_get_sense(int driveid, u8 *asc, u8 *ascq)
312 u8 atacmd[12], buffer[18];
313 memset(atacmd, 0, sizeof(atacmd));
314 atacmd[0] = ATA_CMD_REQUEST_SENSE;
315 atacmd[4] = sizeof(buffer);
316 int ret = ata_cmd_packet(driveid, atacmd, sizeof(atacmd), sizeof(buffer)
317 , MAKE_FLATPTR(GET_SEG(SS), buffer));
329 atapi_read_capacity(int driveid, u32 *blksize, u32 *sectors)
331 u8 packet[12], buf[8];
332 memset(packet, 0, sizeof(packet));
333 packet[0] = 0x25; /* READ CAPACITY */
334 int ret = ata_cmd_packet(driveid, packet, sizeof(packet), sizeof(buf)
335 , MAKE_FLATPTR(GET_SEG(SS), buf));
339 *blksize = (((u32)buf[4] << 24) | ((u32)buf[5] << 16)
340 | ((u32)buf[6] << 8) | ((u32)buf[7] << 0));
341 *sectors = (((u32)buf[0] << 24) | ((u32)buf[1] << 16)
342 | ((u32)buf[2] << 8) | ((u32)buf[3] << 0));
348 atapi_is_ready(u16 driveid)
350 dprintf(6, "atapi_is_ready (driveid=%d)\n", driveid);
352 /* Retry READ CAPACITY for 5 seconds unless MEDIUM NOT PRESENT is
353 * reported by the device. If the device reports "IN PROGRESS",
354 * 30 seconds is added. */
355 u32 blksize, sectors;
357 u64 end = calc_future_tsc(5000);
359 if (rdtscll() > end) {
360 dprintf(1, "read capacity failed\n");
364 int ret = atapi_read_capacity(driveid, &blksize, §ors);
370 ret = atapi_get_sense(driveid, &asc, &ascq);
376 if (asc == 0x3a) { /* MEDIUM NOT PRESENT */
377 dprintf(1, "Device reports MEDIUM NOT PRESENT\n");
381 if (asc == 0x04 && ascq == 0x01 && !in_progress) {
382 /* IN PROGRESS OF BECOMING READY */
383 printf("Waiting for device to detect medium... ");
384 /* Allow 30 seconds more */
385 end = calc_future_tsc(30000);
390 if (blksize != GET_GLOBAL(Drives.drives[driveid].blksize)) {
391 printf("Unsupported sector size %u\n", blksize);
395 dprintf(6, "sectors=%u\n", sectors);
396 printf("%dMB medium detected\n", sectors>>(20-11));
403 // Verify device is a cdrom.
404 if (cdid >= Drives.cdcount)
406 int driveid = GET_GLOBAL(Drives.idmap[1][cdid]);
408 int ret = atapi_is_ready(driveid);
410 dprintf(1, "atapi_is_ready returned %d\n", ret);
412 // Read the Boot Record Volume Descriptor
414 struct disk_op_s dop;
415 memset(&dop, 0, sizeof(dop));
416 dop.driveid = driveid;
419 dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer);
420 ret = cdrom_read(&dop);
427 if (strcmp((char*)&buffer[1], "CD001\001EL TORITO SPECIFICATION") != 0)
430 // ok, now we calculate the Boot catalog address
431 u32 lba = *(u32*)&buffer[0x47];
433 // And we read the Boot Catalog
435 ret = cdrom_read(&dop);
440 if (buffer[0x00] != 0x01)
442 if (buffer[0x01] != 0x00)
443 return 9; // Platform
444 if (buffer[0x1E] != 0x55)
446 if (buffer[0x1F] != 0xAA)
449 // Initial/Default Entry
450 if (buffer[0x20] != 0x88)
451 return 11; // Bootable
453 u16 ebda_seg = get_ebda_seg();
454 u8 media = buffer[0x21];
455 SET_EBDA2(ebda_seg, cdemu.media, media);
457 SET_EBDA2(ebda_seg, cdemu.controller_index, driveid/2);
458 SET_EBDA2(ebda_seg, cdemu.device_spec, driveid%2);
460 u16 boot_segment = *(u16*)&buffer[0x22];
462 boot_segment = 0x07C0;
463 SET_EBDA2(ebda_seg, cdemu.load_segment, boot_segment);
464 SET_EBDA2(ebda_seg, cdemu.buffer_segment, 0x0000);
466 u16 nbsectors = *(u16*)&buffer[0x26];
467 SET_EBDA2(ebda_seg, cdemu.sector_count, nbsectors);
469 lba = *(u32*)&buffer[0x28];
470 SET_EBDA2(ebda_seg, cdemu.ilba, lba);
472 // And we read the image in memory
474 dop.count = DIV_ROUND_UP(nbsectors, 4);
475 dop.buf_fl = MAKE_FLATPTR(boot_segment, 0);
476 ret = cdrom_read(&dop);
481 // No emulation requested - return success.
482 SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0xE0 + cdid);
486 // Emulation of a floppy/harddisk requested
487 if (! CONFIG_CDROM_EMU)
490 // Set emulated drive id and increase bios installed hardware
494 SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0x00);
495 SETBITS_BDA(equipment_list_flags, 0x41);
498 case 0x01: // 1.2M floppy
499 SET_EBDA2(ebda_seg, cdemu.lchs.spt, 15);
500 SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
501 SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
503 case 0x02: // 1.44M floppy
504 SET_EBDA2(ebda_seg, cdemu.lchs.spt, 18);
505 SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
506 SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
508 case 0x03: // 2.88M floppy
509 SET_EBDA2(ebda_seg, cdemu.lchs.spt, 36);
510 SET_EBDA2(ebda_seg, cdemu.lchs.cylinders, 80);
511 SET_EBDA2(ebda_seg, cdemu.lchs.heads, 2);
515 // Harddrive emulation
516 SET_EBDA2(ebda_seg, cdemu.emulated_drive, 0x80);
517 SET_BDA(hdcount, GET_BDA(hdcount) + 1);
519 // Peak at partition table to get chs.
520 struct mbr_s *mbr = (void*)0;
521 u8 sptcyl = GET_FARVAR(boot_segment, mbr->partitions[0].last.sptcyl);
522 u8 cyllow = GET_FARVAR(boot_segment, mbr->partitions[0].last.cyllow);
523 u8 heads = GET_FARVAR(boot_segment, mbr->partitions[0].last.heads);
525 SET_EBDA2(ebda_seg, cdemu.lchs.spt, sptcyl & 0x3f);
526 SET_EBDA2(ebda_seg, cdemu.lchs.cylinders
527 , ((sptcyl<<2)&0x300) + cyllow + 1);
528 SET_EBDA2(ebda_seg, cdemu.lchs.heads, heads + 1);
531 // everything is ok, so from now on, the emulation is active
532 SET_EBDA2(ebda_seg, cdemu.active, 0x01);
533 dprintf(6, "cdemu media=%d\n", media);