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Kevin O'Connor31d8c8a2008-03-04 19:56:41 -05001// 16bit code to access cdrom 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 "disk.h" // cdrom_13
9#include "util.h" // memset
10#include "ata.h" // ATA_CMD_READ_SECTORS
Kevin O'Connor9521e262008-07-04 13:04:29 -040011#include "bregs.h" // struct bregs
12#include "biosvar.h" // GET_EBDA
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -050013
14
15/****************************************************************
16 * CDROM functions
17 ****************************************************************/
18
19// read disk drive size
20static void
21cdrom_1315(struct bregs *regs, u8 device)
22{
23 disk_ret(regs, DISK_RET_EADDRNOTFOUND);
24}
25
26// lock
27static void
28cdrom_134500(struct bregs *regs, u8 device)
29{
30 u8 locks = GET_EBDA(ata.devices[device].lock);
31 if (locks == 0xff) {
32 regs->al = 1;
33 disk_ret(regs, DISK_RET_ETOOMANYLOCKS);
34 return;
35 }
36 SET_EBDA(ata.devices[device].lock, locks + 1);
37 regs->al = 1;
38 disk_ret(regs, DISK_RET_SUCCESS);
39}
40
41// unlock
42static void
43cdrom_134501(struct bregs *regs, u8 device)
44{
45 u8 locks = GET_EBDA(ata.devices[device].lock);
46 if (locks == 0x00) {
47 regs->al = 0;
48 disk_ret(regs, DISK_RET_ENOTLOCKED);
49 return;
50 }
51 locks--;
52 SET_EBDA(ata.devices[device].lock, locks);
53 regs->al = (locks ? 1 : 0);
54 disk_ret(regs, DISK_RET_SUCCESS);
55}
56
57// status
58static void
59cdrom_134502(struct bregs *regs, u8 device)
60{
61 u8 locks = GET_EBDA(ata.devices[device].lock);
62 regs->al = (locks ? 1 : 0);
63 disk_ret(regs, DISK_RET_SUCCESS);
64}
65
66static void
67cdrom_1345XX(struct bregs *regs, u8 device)
68{
69 disk_ret(regs, DISK_RET_EPARAM);
70}
71
72// IBM/MS lock/unlock drive
73static void
74cdrom_1345(struct bregs *regs, u8 device)
75{
76 switch (regs->al) {
77 case 0x00: cdrom_134500(regs, device); break;
78 case 0x01: cdrom_134501(regs, device); break;
79 case 0x02: cdrom_134502(regs, device); break;
80 default: cdrom_1345XX(regs, device); break;
81 }
82}
83
84// IBM/MS eject media
85static void
86cdrom_1346(struct bregs *regs, u8 device)
87{
88 u8 locks = GET_EBDA(ata.devices[device].lock);
89 if (locks != 0) {
90 disk_ret(regs, DISK_RET_ELOCKED);
91 return;
92 }
93
94 // FIXME should handle 0x31 no media in device
95 // FIXME should handle 0xb5 valid request failed
96
97 // Call removable media eject
98 struct bregs br;
99 memset(&br, 0, sizeof(br));
100 br.ah = 0x52;
101 call16_int(0x15, &br);
102
103 if (br.ah || br.flags & F_CF) {
104 disk_ret(regs, DISK_RET_ELOCKED);
105 return;
106 }
107 disk_ret(regs, DISK_RET_SUCCESS);
108}
109
110// IBM/MS extended media change
111static void
112cdrom_1349(struct bregs *regs, u8 device)
113{
Kevin O'Connor6c781222008-03-09 12:19:23 -0400114 set_fail(regs);
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -0500115 // always send changed ??
116 regs->ah = DISK_RET_ECHANGED;
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -0500117}
118
119static void
120cdrom_ok(struct bregs *regs, u8 device)
121{
122 disk_ret(regs, DISK_RET_SUCCESS);
123}
124
125static void
126cdrom_wp(struct bregs *regs, u8 device)
127{
128 disk_ret(regs, DISK_RET_EWRITEPROTECT);
129}
130
131void
132cdrom_13(struct bregs *regs, u8 device)
133{
134 //debug_stub(regs);
135
136 switch (regs->ah) {
137 case 0x15: cdrom_1315(regs, device); break;
138 case 0x45: cdrom_1345(regs, device); break;
139 case 0x46: cdrom_1346(regs, device); break;
140 case 0x49: cdrom_1349(regs, device); break;
141
142 // These functions are the same as for hard disks
143 case 0x01:
144 case 0x41:
145 case 0x42:
146 case 0x44:
147 case 0x47:
148 case 0x48:
149 case 0x4e:
150 disk_13(regs, device);
151 break;
152
153 // all these functions return SUCCESS
154 case 0x00: // disk controller reset
155 case 0x09: // initialize drive parameters
156 case 0x0c: // seek to specified cylinder
157 case 0x0d: // alternate disk reset
158 case 0x10: // check drive ready
159 case 0x11: // recalibrate
160 case 0x14: // controller internal diagnostic
161 case 0x16: // detect disk change
162 cdrom_ok(regs, device);
163 break;
164
165 // all these functions return disk write-protected
166 case 0x03: // write disk sectors
167 case 0x05: // format disk track
168 case 0x43: // IBM/MS extended write
169 cdrom_wp(regs, device);
170 break;
171
172 default: disk_13XX(regs, device); break;
173 }
174}
175
176
177/****************************************************************
178 * CD emulation
179 ****************************************************************/
180
Kevin O'Connoraa2590c2008-03-22 23:13:24 -0400181// Read a series of 512 byte sectors from the cdrom starting at the
182// image offset.
Kevin O'Connoree55c762008-05-13 00:18:20 -0400183__always_inline int
Kevin O'Connoraa2590c2008-03-22 23:13:24 -0400184cdrom_read_emu(u16 biosid, u32 vlba, u32 count, void *far_buffer)
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -0500185{
Kevin O'Connoraa2590c2008-03-22 23:13:24 -0400186 u32 ilba = GET_EBDA(cdemu.ilba);
187 return cdrom_read_512(biosid, ilba * 4 + vlba, count, far_buffer);
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -0500188}
189
190// read disk drive parameters
191static void
192cdemu_1308(struct bregs *regs, u8 device)
193{
194 u16 nlc = GET_EBDA(cdemu.vdevice.cylinders) - 1;
195 u16 nlh = GET_EBDA(cdemu.vdevice.heads) - 1;
196 u16 nlspt = GET_EBDA(cdemu.vdevice.spt);
197
198 regs->al = 0x00;
199 regs->bl = 0x00;
200 regs->ch = nlc & 0xff;
201 regs->cl = ((nlc >> 2) & 0xc0) | (nlspt & 0x3f);
202 regs->dh = nlh;
203 // FIXME ElTorito Various. should send the real count of drives 1 or 2
204 // FIXME ElTorito Harddisk. should send the HD count
205 regs->dl = 0x02;
206 u8 media = GET_EBDA(cdemu.media);
207 if (media <= 3)
208 regs->bl = media * 2;
209
210 regs->es = SEG_BIOS;
Kevin O'Connor117fc212008-04-13 18:17:02 -0400211 regs->di = (u32)&diskette_param_table2;
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -0500212
213 disk_ret(regs, DISK_RET_SUCCESS);
214}
215
216void
217cdemu_13(struct bregs *regs)
218{
219 //debug_stub(regs);
220
221 u8 device = GET_EBDA(cdemu.controller_index) * 2;
222 device += GET_EBDA(cdemu.device_spec);
223
224 switch (regs->ah) {
Kevin O'Connoraa2590c2008-03-22 23:13:24 -0400225 // These functions are the same as for hard disks
226 case 0x02:
227 case 0x04:
228 disk_13(regs, device);
229 break;
230
Kevin O'Connoraa7ddd72008-03-22 23:58:26 -0400231 // These functions are the same as standard CDROM.
232 case 0x00:
233 case 0x01:
234 case 0x03:
235 case 0x05:
236 case 0x09:
237 case 0x0c:
238 case 0x0d:
239 case 0x10:
240 case 0x11:
241 case 0x14:
242 case 0x15:
243 case 0x16:
244 cdrom_13(regs, device);
245 break;
246
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -0500247 case 0x08: cdemu_1308(regs, device); break;
Kevin O'Connoraa2590c2008-03-22 23:13:24 -0400248
Kevin O'Connoraa7ddd72008-03-22 23:58:26 -0400249 default: disk_13XX(regs, device); break;
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -0500250 }
251}
252
253struct eltorito_s {
254 u8 size;
255 u8 media;
256 u8 emulated_drive;
257 u8 controller_index;
258 u32 ilba;
259 u16 device_spec;
260 u16 buffer_segment;
261 u16 load_segment;
262 u16 sector_count;
263 u8 cylinders;
264 u8 sectors;
265 u8 heads;
266};
267
268#define SET_INT13ET(regs,var,val) \
269 SET_FARVAR((regs)->ds, ((struct eltorito_s*)((regs)->si+0))->var, (val))
270
271// ElTorito - Terminate disk emu
272void
273cdemu_134b(struct bregs *regs)
274{
275 // FIXME ElTorito Hardcoded
276 SET_INT13ET(regs, size, 0x13);
277 SET_INT13ET(regs, media, GET_EBDA(cdemu.media));
278 SET_INT13ET(regs, emulated_drive, GET_EBDA(cdemu.emulated_drive));
279 SET_INT13ET(regs, controller_index, GET_EBDA(cdemu.controller_index));
280 SET_INT13ET(regs, ilba, GET_EBDA(cdemu.ilba));
281 SET_INT13ET(regs, device_spec, GET_EBDA(cdemu.device_spec));
282 SET_INT13ET(regs, buffer_segment, GET_EBDA(cdemu.buffer_segment));
283 SET_INT13ET(regs, load_segment, GET_EBDA(cdemu.load_segment));
284 SET_INT13ET(regs, sector_count, GET_EBDA(cdemu.sector_count));
285 SET_INT13ET(regs, cylinders, GET_EBDA(cdemu.vdevice.cylinders));
286 SET_INT13ET(regs, sectors, GET_EBDA(cdemu.vdevice.spt));
287 SET_INT13ET(regs, heads, GET_EBDA(cdemu.vdevice.heads));
288
289 // If we have to terminate emulation
290 if (regs->al == 0x00) {
291 // FIXME ElTorito Various. Should be handled accordingly to spec
292 SET_EBDA(cdemu.active, 0x00); // bye bye
293 }
294
295 disk_ret(regs, DISK_RET_SUCCESS);
296}
Kevin O'Connor180a9592008-03-04 22:50:53 -0500297
298
299/****************************************************************
300 * CD booting
301 ****************************************************************/
302
303// Request SENSE
Kevin O'Connora05223c2008-06-28 12:15:57 -0400304static int
Kevin O'Connor180a9592008-03-04 22:50:53 -0500305atapi_get_sense(u16 device, u8 *asc, u8 *ascq)
306{
307 u8 buffer[18];
308 u8 atacmd[12];
309 memset(atacmd, 0, sizeof(atacmd));
310 atacmd[0] = ATA_CMD_REQUEST_SENSE;
311 atacmd[4] = sizeof(buffer);
Kevin O'Connora05223c2008-06-28 12:15:57 -0400312 int ret = ata_cmd_packet(device, atacmd, sizeof(atacmd), sizeof(buffer)
Kevin O'Connor070231b2008-03-22 20:44:37 -0400313 , MAKE_FARPTR(GET_SEG(SS), (u32)buffer));
Kevin O'Connor180a9592008-03-04 22:50:53 -0500314 if (ret != 0)
Kevin O'Connora05223c2008-06-28 12:15:57 -0400315 return ret;
Kevin O'Connor180a9592008-03-04 22:50:53 -0500316
317 *asc = buffer[12];
318 *ascq = buffer[13];
319
320 return 0;
321}
322
Kevin O'Connora05223c2008-06-28 12:15:57 -0400323static int
Kevin O'Connor180a9592008-03-04 22:50:53 -0500324atapi_is_ready(u16 device)
325{
326 if (GET_EBDA(ata.devices[device].type) != ATA_TYPE_ATAPI) {
327 printf("not implemented for non-ATAPI device\n");
328 return -1;
329 }
330
Kevin O'Connora05223c2008-06-28 12:15:57 -0400331 dprintf(6, "ata_detect_medium: begin\n");
Kevin O'Connor180a9592008-03-04 22:50:53 -0500332 u8 packet[12];
333 memset(packet, 0, sizeof(packet));
334 packet[0] = 0x25; /* READ CAPACITY */
335
336 /* Retry READ CAPACITY 50 times unless MEDIUM NOT PRESENT
337 * is reported by the device. If the device reports "IN PROGRESS",
338 * 30 seconds is added. */
339 u8 buf[8];
340 u32 timeout = 5000;
341 u32 time = 0;
342 u8 in_progress = 0;
343 for (;; time+=100) {
344 if (time >= timeout) {
Kevin O'Connora05223c2008-06-28 12:15:57 -0400345 dprintf(1, "read capacity failed\n");
Kevin O'Connor180a9592008-03-04 22:50:53 -0500346 return -1;
347 }
Kevin O'Connora05223c2008-06-28 12:15:57 -0400348 int ret = ata_cmd_packet(device, packet, sizeof(packet), sizeof(buf)
Kevin O'Connor070231b2008-03-22 20:44:37 -0400349 , MAKE_FARPTR(GET_SEG(SS), (u32)buf));
Kevin O'Connor180a9592008-03-04 22:50:53 -0500350 if (ret == 0)
351 break;
352
353 u8 asc=0, ascq=0;
354 ret = atapi_get_sense(device, &asc, &ascq);
355 if (!ret)
356 continue;
357
358 if (asc == 0x3a) { /* MEDIUM NOT PRESENT */
Kevin O'Connora05223c2008-06-28 12:15:57 -0400359 dprintf(1, "Device reports MEDIUM NOT PRESENT\n");
Kevin O'Connor180a9592008-03-04 22:50:53 -0500360 return -1;
361 }
362
363 if (asc == 0x04 && ascq == 0x01 && !in_progress) {
364 /* IN PROGRESS OF BECOMING READY */
365 printf("Waiting for device to detect medium... ");
366 /* Allow 30 seconds more */
367 timeout = 30000;
368 in_progress = 1;
369 }
370 }
371
372 u32 block_len = (u32) buf[4] << 24
373 | (u32) buf[5] << 16
374 | (u32) buf[6] << 8
375 | (u32) buf[7] << 0;
376
377 if (block_len != 2048 && block_len != 512) {
378 printf("Unsupported sector size %u\n", block_len);
379 return -1;
380 }
381 SET_EBDA(ata.devices[device].blksize, block_len);
382
383 u32 sectors = (u32) buf[0] << 24
384 | (u32) buf[1] << 16
385 | (u32) buf[2] << 8
386 | (u32) buf[3] << 0;
387
Kevin O'Connora05223c2008-06-28 12:15:57 -0400388 dprintf(6, "sectors=%u\n", sectors);
Kevin O'Connor180a9592008-03-04 22:50:53 -0500389 if (block_len == 2048)
390 sectors <<= 2; /* # of sectors in 512-byte "soft" sector */
391 if (sectors != GET_EBDA(ata.devices[device].sectors))
392 printf("%dMB medium detected\n", sectors>>(20-9));
393 SET_EBDA(ata.devices[device].sectors, sectors);
394 return 0;
395}
396
Kevin O'Connora05223c2008-06-28 12:15:57 -0400397static int
Kevin O'Connor180a9592008-03-04 22:50:53 -0500398atapi_is_cdrom(u8 device)
399{
400 if (device >= CONFIG_MAX_ATA_DEVICES)
401 return 0;
402
403 if (GET_EBDA(ata.devices[device].type) != ATA_TYPE_ATAPI)
404 return 0;
405
406 if (GET_EBDA(ata.devices[device].device) != ATA_DEVICE_CDROM)
407 return 0;
408
409 return 1;
410}
411
412// Compare a string on the stack to one in the code segment.
413static int
414streq_cs(u8 *s1, char *cs_s2)
415{
416 u8 *s2 = (u8*)cs_s2;
417 for (;;) {
418 if (*s1 != GET_VAR(CS, *s2))
419 return 0;
420 if (! *s1)
421 return 1;
422 s1++;
423 s2++;
424 }
425}
426
Kevin O'Connora05223c2008-06-28 12:15:57 -0400427int
Kevin O'Connor180a9592008-03-04 22:50:53 -0500428cdrom_boot()
429{
430 // Find out the first cdrom
431 u8 device;
432 for (device=0; device<CONFIG_MAX_ATA_DEVICES; device++)
433 if (atapi_is_cdrom(device))
434 break;
435
Kevin O'Connora05223c2008-06-28 12:15:57 -0400436 int ret = atapi_is_ready(device);
Kevin O'Connor180a9592008-03-04 22:50:53 -0500437 if (ret)
Kevin O'Connorac8df8c2008-05-24 23:46:33 -0400438 dprintf(1, "ata_is_ready returned %d\n", ret);
Kevin O'Connor180a9592008-03-04 22:50:53 -0500439
440 // if not found
441 if (device >= CONFIG_MAX_ATA_DEVICES)
442 return 2;
443
444 // Read the Boot Record Volume Descriptor
445 u8 buffer[2048];
Kevin O'Connoraa2590c2008-03-22 23:13:24 -0400446 ret = cdrom_read(device, 0x11, 1
447 , MAKE_FARPTR(GET_SEG(SS), (u32)buffer));
Kevin O'Connor180a9592008-03-04 22:50:53 -0500448 if (ret)
449 return 3;
450
451 // Validity checks
452 if (buffer[0])
453 return 4;
454 if (!streq_cs(&buffer[1], "CD001\001EL TORITO SPECIFICATION"))
455 return 5;
456
457 // ok, now we calculate the Boot catalog address
458 u32 lba = *(u32*)&buffer[0x47];
459
460 // And we read the Boot Catalog
Kevin O'Connoraa2590c2008-03-22 23:13:24 -0400461 ret = cdrom_read(device, lba, 1
462 , MAKE_FARPTR(GET_SEG(SS), (u32)buffer));
Kevin O'Connor180a9592008-03-04 22:50:53 -0500463 if (ret)
464 return 7;
465
466 // Validation entry
467 if (buffer[0x00] != 0x01)
468 return 8; // Header
469 if (buffer[0x01] != 0x00)
470 return 9; // Platform
471 if (buffer[0x1E] != 0x55)
472 return 10; // key 1
473 if (buffer[0x1F] != 0xAA)
474 return 10; // key 2
475
476 // Initial/Default Entry
477 if (buffer[0x20] != 0x88)
478 return 11; // Bootable
479
Kevin O'Connordfa16502008-03-22 20:13:08 -0400480 u8 media = buffer[0x21];
481 SET_EBDA(cdemu.media, media);
Kevin O'Connor180a9592008-03-04 22:50:53 -0500482
483 SET_EBDA(cdemu.controller_index, device/2);
484 SET_EBDA(cdemu.device_spec, device%2);
485
486 u16 boot_segment = *(u16*)&buffer[0x22];
487 if (!boot_segment)
488 boot_segment = 0x07C0;
Kevin O'Connordfa16502008-03-22 20:13:08 -0400489 SET_EBDA(cdemu.load_segment, boot_segment);
490 SET_EBDA(cdemu.buffer_segment, 0x0000);
Kevin O'Connor180a9592008-03-04 22:50:53 -0500491
492 u16 nbsectors = *(u16*)&buffer[0x26];
493 SET_EBDA(cdemu.sector_count, nbsectors);
494
495 lba = *(u32*)&buffer[0x28];
496 SET_EBDA(cdemu.ilba, lba);
497
498 // And we read the image in memory
Kevin O'Connoraa2590c2008-03-22 23:13:24 -0400499 ret = cdrom_read_emu(device, 0, nbsectors, MAKE_FARPTR(boot_segment, 0));
Kevin O'Connor180a9592008-03-04 22:50:53 -0500500 if (ret)
501 return 12;
502
Kevin O'Connordfa16502008-03-22 20:13:08 -0400503 if (media == 0) {
504 // No emulation requested - return success.
505
506 // FIXME ElTorito Hardcoded. cdrom is hardcoded as device 0xE0.
507 // Win2000 cd boot needs to know it booted from cd
508 SET_EBDA(cdemu.emulated_drive, 0xE0);
509
510 return 0;
511 }
512
513 // Emulation of a floppy/harddisk requested
514 if (! CONFIG_CDROM_EMU)
515 return 13;
516
517 // Set emulated drive id and increase bios installed hardware
518 // number of devices
519 if (media < 4) {
520 // Floppy emulation
521 SET_EBDA(cdemu.emulated_drive, 0x00);
522 SETBITS_BDA(equipment_list_flags, 0x41);
523 } else {
524 // Harddrive emulation
525 SET_EBDA(cdemu.emulated_drive, 0x80);
526 SET_EBDA(ata.hdcount, GET_EBDA(ata.hdcount) + 1);
527 }
528
Kevin O'Connor180a9592008-03-04 22:50:53 -0500529 // Remember the media type
Kevin O'Connordfa16502008-03-22 20:13:08 -0400530 switch (media) {
Kevin O'Connor180a9592008-03-04 22:50:53 -0500531 case 0x01: // 1.2M floppy
532 SET_EBDA(cdemu.vdevice.spt, 15);
533 SET_EBDA(cdemu.vdevice.cylinders, 80);
534 SET_EBDA(cdemu.vdevice.heads, 2);
535 break;
536 case 0x02: // 1.44M floppy
537 SET_EBDA(cdemu.vdevice.spt, 18);
538 SET_EBDA(cdemu.vdevice.cylinders, 80);
539 SET_EBDA(cdemu.vdevice.heads, 2);
540 break;
541 case 0x03: // 2.88M floppy
542 SET_EBDA(cdemu.vdevice.spt, 36);
543 SET_EBDA(cdemu.vdevice.cylinders, 80);
544 SET_EBDA(cdemu.vdevice.heads, 2);
545 break;
546 case 0x04: { // Harddrive
547 u16 spt = GET_FARVAR(boot_segment,*(u8*)(446+6));
548 u16 cyl = (spt << 2) + GET_FARVAR(boot_segment,*(u8*)(446+7)) + 1;
549 u16 heads = GET_FARVAR(boot_segment,*(u8*)(446+5)) + 1;
550 SET_EBDA(cdemu.vdevice.spt, spt & 0x3f);
551 SET_EBDA(cdemu.vdevice.cylinders, cyl);
552 SET_EBDA(cdemu.vdevice.heads, heads);
553 break;
554 }
555 }
556
Kevin O'Connordfa16502008-03-22 20:13:08 -0400557 // everything is ok, so from now on, the emulation is active
558 SET_EBDA(cdemu.active, 0x01);
Kevin O'Connora05223c2008-06-28 12:15:57 -0400559 dprintf(6, "cdemu media=%d\n", media);
Kevin O'Connor180a9592008-03-04 22:50:53 -0500560
561 return 0;
562}