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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
11
Kevin O'Connor180a9592008-03-04 22:50:53 -050012#define DEBUGF1(fmt, args...) bprintf(0, fmt , ##args)
13#define DEBUGF(fmt, args...)
14
Kevin O'Connor31d8c8a2008-03-04 19:56:41 -050015
16/****************************************************************
17 * CDROM functions
18 ****************************************************************/
19
20// read disk drive size
21static void
22cdrom_1315(struct bregs *regs, u8 device)
23{
24 disk_ret(regs, DISK_RET_EADDRNOTFOUND);
25}
26
27// lock
28static void
29cdrom_134500(struct bregs *regs, u8 device)
30{
31 u8 locks = GET_EBDA(ata.devices[device].lock);
32 if (locks == 0xff) {
33 regs->al = 1;
34 disk_ret(regs, DISK_RET_ETOOMANYLOCKS);
35 return;
36 }
37 SET_EBDA(ata.devices[device].lock, locks + 1);
38 regs->al = 1;
39 disk_ret(regs, DISK_RET_SUCCESS);
40}
41
42// unlock
43static void
44cdrom_134501(struct bregs *regs, u8 device)
45{
46 u8 locks = GET_EBDA(ata.devices[device].lock);
47 if (locks == 0x00) {
48 regs->al = 0;
49 disk_ret(regs, DISK_RET_ENOTLOCKED);
50 return;
51 }
52 locks--;
53 SET_EBDA(ata.devices[device].lock, locks);
54 regs->al = (locks ? 1 : 0);
55 disk_ret(regs, DISK_RET_SUCCESS);
56}
57
58// status
59static void
60cdrom_134502(struct bregs *regs, u8 device)
61{
62 u8 locks = GET_EBDA(ata.devices[device].lock);
63 regs->al = (locks ? 1 : 0);
64 disk_ret(regs, DISK_RET_SUCCESS);
65}
66
67static void
68cdrom_1345XX(struct bregs *regs, u8 device)
69{
70 disk_ret(regs, DISK_RET_EPARAM);
71}
72
73// IBM/MS lock/unlock drive
74static void
75cdrom_1345(struct bregs *regs, u8 device)
76{
77 switch (regs->al) {
78 case 0x00: cdrom_134500(regs, device); break;
79 case 0x01: cdrom_134501(regs, device); break;
80 case 0x02: cdrom_134502(regs, device); break;
81 default: cdrom_1345XX(regs, device); break;
82 }
83}
84
85// IBM/MS eject media
86static void
87cdrom_1346(struct bregs *regs, u8 device)
88{
89 u8 locks = GET_EBDA(ata.devices[device].lock);
90 if (locks != 0) {
91 disk_ret(regs, DISK_RET_ELOCKED);
92 return;
93 }
94
95 // FIXME should handle 0x31 no media in device
96 // FIXME should handle 0xb5 valid request failed
97
98 // Call removable media eject
99 struct bregs br;
100 memset(&br, 0, sizeof(br));
101 br.ah = 0x52;
102 call16_int(0x15, &br);
103
104 if (br.ah || br.flags & F_CF) {
105 disk_ret(regs, DISK_RET_ELOCKED);
106 return;
107 }
108 disk_ret(regs, DISK_RET_SUCCESS);
109}
110
111// IBM/MS extended media change
112static void
113cdrom_1349(struct bregs *regs, u8 device)
114{
115 // always send changed ??
116 regs->ah = DISK_RET_ECHANGED;
117 set_cf(regs, 1);
118}
119
120static void
121cdrom_ok(struct bregs *regs, u8 device)
122{
123 disk_ret(regs, DISK_RET_SUCCESS);
124}
125
126static void
127cdrom_wp(struct bregs *regs, u8 device)
128{
129 disk_ret(regs, DISK_RET_EWRITEPROTECT);
130}
131
132void
133cdrom_13(struct bregs *regs, u8 device)
134{
135 //debug_stub(regs);
136
137 switch (regs->ah) {
138 case 0x15: cdrom_1315(regs, device); break;
139 case 0x45: cdrom_1345(regs, device); break;
140 case 0x46: cdrom_1346(regs, device); break;
141 case 0x49: cdrom_1349(regs, device); break;
142
143 // These functions are the same as for hard disks
144 case 0x01:
145 case 0x41:
146 case 0x42:
147 case 0x44:
148 case 0x47:
149 case 0x48:
150 case 0x4e:
151 disk_13(regs, device);
152 break;
153
154 // all these functions return SUCCESS
155 case 0x00: // disk controller reset
156 case 0x09: // initialize drive parameters
157 case 0x0c: // seek to specified cylinder
158 case 0x0d: // alternate disk reset
159 case 0x10: // check drive ready
160 case 0x11: // recalibrate
161 case 0x14: // controller internal diagnostic
162 case 0x16: // detect disk change
163 cdrom_ok(regs, device);
164 break;
165
166 // all these functions return disk write-protected
167 case 0x03: // write disk sectors
168 case 0x05: // format disk track
169 case 0x43: // IBM/MS extended write
170 cdrom_wp(regs, device);
171 break;
172
173 default: disk_13XX(regs, device); break;
174 }
175}
176
177
178/****************************************************************
179 * CD emulation
180 ****************************************************************/
181
182// read disk sectors
183static void
184cdemu_1302(struct bregs *regs, u8 device)
185{
186 emu_access(regs, device, ATA_CMD_READ_SECTORS);
187}
188
189// verify disk sectors
190static void
191cdemu_1304(struct bregs *regs, u8 device)
192{
193 emu_access(regs, device, 0);
194}
195
196// read disk drive parameters
197static void
198cdemu_1308(struct bregs *regs, u8 device)
199{
200 u16 nlc = GET_EBDA(cdemu.vdevice.cylinders) - 1;
201 u16 nlh = GET_EBDA(cdemu.vdevice.heads) - 1;
202 u16 nlspt = GET_EBDA(cdemu.vdevice.spt);
203
204 regs->al = 0x00;
205 regs->bl = 0x00;
206 regs->ch = nlc & 0xff;
207 regs->cl = ((nlc >> 2) & 0xc0) | (nlspt & 0x3f);
208 regs->dh = nlh;
209 // FIXME ElTorito Various. should send the real count of drives 1 or 2
210 // FIXME ElTorito Harddisk. should send the HD count
211 regs->dl = 0x02;
212 u8 media = GET_EBDA(cdemu.media);
213 if (media <= 3)
214 regs->bl = media * 2;
215
216 regs->es = SEG_BIOS;
217 regs->di = (u16)&diskette_param_table2;
218
219 disk_ret(regs, DISK_RET_SUCCESS);
220}
221
222void
223cdemu_13(struct bregs *regs)
224{
225 //debug_stub(regs);
226
227 u8 device = GET_EBDA(cdemu.controller_index) * 2;
228 device += GET_EBDA(cdemu.device_spec);
229
230 switch (regs->ah) {
231 case 0x02: cdemu_1302(regs, device); break;
232 case 0x04: cdemu_1304(regs, device); break;
233 case 0x08: cdemu_1308(regs, device); break;
234 // XXX - All other calls get passed to standard CDROM functions.
235 default: cdrom_13(regs, device); break;
236 }
237}
238
239struct eltorito_s {
240 u8 size;
241 u8 media;
242 u8 emulated_drive;
243 u8 controller_index;
244 u32 ilba;
245 u16 device_spec;
246 u16 buffer_segment;
247 u16 load_segment;
248 u16 sector_count;
249 u8 cylinders;
250 u8 sectors;
251 u8 heads;
252};
253
254#define SET_INT13ET(regs,var,val) \
255 SET_FARVAR((regs)->ds, ((struct eltorito_s*)((regs)->si+0))->var, (val))
256
257// ElTorito - Terminate disk emu
258void
259cdemu_134b(struct bregs *regs)
260{
261 // FIXME ElTorito Hardcoded
262 SET_INT13ET(regs, size, 0x13);
263 SET_INT13ET(regs, media, GET_EBDA(cdemu.media));
264 SET_INT13ET(regs, emulated_drive, GET_EBDA(cdemu.emulated_drive));
265 SET_INT13ET(regs, controller_index, GET_EBDA(cdemu.controller_index));
266 SET_INT13ET(regs, ilba, GET_EBDA(cdemu.ilba));
267 SET_INT13ET(regs, device_spec, GET_EBDA(cdemu.device_spec));
268 SET_INT13ET(regs, buffer_segment, GET_EBDA(cdemu.buffer_segment));
269 SET_INT13ET(regs, load_segment, GET_EBDA(cdemu.load_segment));
270 SET_INT13ET(regs, sector_count, GET_EBDA(cdemu.sector_count));
271 SET_INT13ET(regs, cylinders, GET_EBDA(cdemu.vdevice.cylinders));
272 SET_INT13ET(regs, sectors, GET_EBDA(cdemu.vdevice.spt));
273 SET_INT13ET(regs, heads, GET_EBDA(cdemu.vdevice.heads));
274
275 // If we have to terminate emulation
276 if (regs->al == 0x00) {
277 // FIXME ElTorito Various. Should be handled accordingly to spec
278 SET_EBDA(cdemu.active, 0x00); // bye bye
279 }
280
281 disk_ret(regs, DISK_RET_SUCCESS);
282}
Kevin O'Connor180a9592008-03-04 22:50:53 -0500283
284
285/****************************************************************
286 * CD booting
287 ****************************************************************/
288
289// Request SENSE
290static u16
291atapi_get_sense(u16 device, u8 *asc, u8 *ascq)
292{
293 u8 buffer[18];
294 u8 atacmd[12];
295 memset(atacmd, 0, sizeof(atacmd));
296 atacmd[0] = ATA_CMD_REQUEST_SENSE;
297 atacmd[4] = sizeof(buffer);
298 u16 ret = ata_cmd_packet(device, atacmd, sizeof(atacmd)
299 , 18L, 0, ATA_DATA_IN, GET_SEG(SS), (u32)buffer);
300 if (ret != 0)
301 return 0x0002;
302
303 *asc = buffer[12];
304 *ascq = buffer[13];
305
306 return 0;
307}
308
309static u16
310atapi_is_ready(u16 device)
311{
312 if (GET_EBDA(ata.devices[device].type) != ATA_TYPE_ATAPI) {
313 printf("not implemented for non-ATAPI device\n");
314 return -1;
315 }
316
317 DEBUGF("ata_detect_medium: begin\n");
318 u8 packet[12];
319 memset(packet, 0, sizeof(packet));
320 packet[0] = 0x25; /* READ CAPACITY */
321
322 /* Retry READ CAPACITY 50 times unless MEDIUM NOT PRESENT
323 * is reported by the device. If the device reports "IN PROGRESS",
324 * 30 seconds is added. */
325 u8 buf[8];
326 u32 timeout = 5000;
327 u32 time = 0;
328 u8 in_progress = 0;
329 for (;; time+=100) {
330 if (time >= timeout) {
331 DEBUGF("read capacity failed\n");
332 return -1;
333 }
334 u16 ret = ata_cmd_packet(device, packet, sizeof(packet)
335 , 0, 8L, ATA_DATA_IN, GET_SEG(SS), (u32)buf);
336 if (ret == 0)
337 break;
338
339 u8 asc=0, ascq=0;
340 ret = atapi_get_sense(device, &asc, &ascq);
341 if (!ret)
342 continue;
343
344 if (asc == 0x3a) { /* MEDIUM NOT PRESENT */
345 DEBUGF("Device reports MEDIUM NOT PRESENT\n");
346 return -1;
347 }
348
349 if (asc == 0x04 && ascq == 0x01 && !in_progress) {
350 /* IN PROGRESS OF BECOMING READY */
351 printf("Waiting for device to detect medium... ");
352 /* Allow 30 seconds more */
353 timeout = 30000;
354 in_progress = 1;
355 }
356 }
357
358 u32 block_len = (u32) buf[4] << 24
359 | (u32) buf[5] << 16
360 | (u32) buf[6] << 8
361 | (u32) buf[7] << 0;
362
363 if (block_len != 2048 && block_len != 512) {
364 printf("Unsupported sector size %u\n", block_len);
365 return -1;
366 }
367 SET_EBDA(ata.devices[device].blksize, block_len);
368
369 u32 sectors = (u32) buf[0] << 24
370 | (u32) buf[1] << 16
371 | (u32) buf[2] << 8
372 | (u32) buf[3] << 0;
373
374 DEBUGF("sectors=%u\n", sectors);
375 if (block_len == 2048)
376 sectors <<= 2; /* # of sectors in 512-byte "soft" sector */
377 if (sectors != GET_EBDA(ata.devices[device].sectors))
378 printf("%dMB medium detected\n", sectors>>(20-9));
379 SET_EBDA(ata.devices[device].sectors, sectors);
380 return 0;
381}
382
383static u16
384atapi_is_cdrom(u8 device)
385{
386 if (device >= CONFIG_MAX_ATA_DEVICES)
387 return 0;
388
389 if (GET_EBDA(ata.devices[device].type) != ATA_TYPE_ATAPI)
390 return 0;
391
392 if (GET_EBDA(ata.devices[device].device) != ATA_DEVICE_CDROM)
393 return 0;
394
395 return 1;
396}
397
398// Compare a string on the stack to one in the code segment.
399static int
400streq_cs(u8 *s1, char *cs_s2)
401{
402 u8 *s2 = (u8*)cs_s2;
403 for (;;) {
404 if (*s1 != GET_VAR(CS, *s2))
405 return 0;
406 if (! *s1)
407 return 1;
408 s1++;
409 s2++;
410 }
411}
412
413u16
414cdrom_boot()
415{
416 // Find out the first cdrom
417 u8 device;
418 for (device=0; device<CONFIG_MAX_ATA_DEVICES; device++)
419 if (atapi_is_cdrom(device))
420 break;
421
422 u16 ret = atapi_is_ready(device);
423 if (ret)
424 BX_INFO("ata_is_ready returned %d\n", ret);
425
426 // if not found
427 if (device >= CONFIG_MAX_ATA_DEVICES)
428 return 2;
429
430 // Read the Boot Record Volume Descriptor
431 u8 buffer[2048];
432 ret = cdrom_read(device, 0x11, 2048, GET_SEG(SS), (u32)buffer, 0);
433 if (ret)
434 return 3;
435
436 // Validity checks
437 if (buffer[0])
438 return 4;
439 if (!streq_cs(&buffer[1], "CD001\001EL TORITO SPECIFICATION"))
440 return 5;
441
442 // ok, now we calculate the Boot catalog address
443 u32 lba = *(u32*)&buffer[0x47];
444
445 // And we read the Boot Catalog
446 ret = cdrom_read(device, lba, 2048, GET_SEG(SS), (u32)buffer, 0);
447 if (ret)
448 return 7;
449
450 // Validation entry
451 if (buffer[0x00] != 0x01)
452 return 8; // Header
453 if (buffer[0x01] != 0x00)
454 return 9; // Platform
455 if (buffer[0x1E] != 0x55)
456 return 10; // key 1
457 if (buffer[0x1F] != 0xAA)
458 return 10; // key 2
459
460 // Initial/Default Entry
461 if (buffer[0x20] != 0x88)
462 return 11; // Bootable
463
464 SET_EBDA(cdemu.media,buffer[0x21]);
465 if (buffer[0x21] == 0)
466 // FIXME ElTorito Hardcoded. cdrom is hardcoded as device 0xE0.
467 // Win2000 cd boot needs to know it booted from cd
468 SET_EBDA(cdemu.emulated_drive, 0xE0);
469 else if (buffer[0x21] < 4)
470 SET_EBDA(cdemu.emulated_drive, 0x00);
471 else
472 SET_EBDA(cdemu.emulated_drive, 0x80);
473
474 SET_EBDA(cdemu.controller_index, device/2);
475 SET_EBDA(cdemu.device_spec, device%2);
476
477 u16 boot_segment = *(u16*)&buffer[0x22];
478 if (!boot_segment)
479 boot_segment = 0x07C0;
480
481 SET_EBDA(cdemu.load_segment,boot_segment);
482 SET_EBDA(cdemu.buffer_segment,0x0000);
483
484 u16 nbsectors = *(u16*)&buffer[0x26];
485 SET_EBDA(cdemu.sector_count, nbsectors);
486
487 lba = *(u32*)&buffer[0x28];
488 SET_EBDA(cdemu.ilba, lba);
489
490 // And we read the image in memory
491 ret = cdrom_read(device, lba, nbsectors*512
492 , boot_segment, 0, 0);
493 if (ret)
494 return 12;
495
496 // Remember the media type
497 switch (GET_EBDA(cdemu.media)) {
498 case 0x01: // 1.2M floppy
499 SET_EBDA(cdemu.vdevice.spt, 15);
500 SET_EBDA(cdemu.vdevice.cylinders, 80);
501 SET_EBDA(cdemu.vdevice.heads, 2);
502 break;
503 case 0x02: // 1.44M floppy
504 SET_EBDA(cdemu.vdevice.spt, 18);
505 SET_EBDA(cdemu.vdevice.cylinders, 80);
506 SET_EBDA(cdemu.vdevice.heads, 2);
507 break;
508 case 0x03: // 2.88M floppy
509 SET_EBDA(cdemu.vdevice.spt, 36);
510 SET_EBDA(cdemu.vdevice.cylinders, 80);
511 SET_EBDA(cdemu.vdevice.heads, 2);
512 break;
513 case 0x04: { // Harddrive
514 u16 spt = GET_FARVAR(boot_segment,*(u8*)(446+6));
515 u16 cyl = (spt << 2) + GET_FARVAR(boot_segment,*(u8*)(446+7)) + 1;
516 u16 heads = GET_FARVAR(boot_segment,*(u8*)(446+5)) + 1;
517 SET_EBDA(cdemu.vdevice.spt, spt & 0x3f);
518 SET_EBDA(cdemu.vdevice.cylinders, cyl);
519 SET_EBDA(cdemu.vdevice.heads, heads);
520 break;
521 }
522 }
523
524 if (GET_EBDA(cdemu.media) != 0) {
525 // Increase bios installed hardware number of devices
526 if (GET_EBDA(cdemu.emulated_drive) == 0x00)
527 SETBITS_BDA(equipment_list_flags, 0x41);
528 else
529 SET_EBDA(ata.hdcount, GET_EBDA(ata.hdcount) + 1);
530 }
531
532 // everything is ok, so from now on, the emulation is active
533 if (GET_EBDA(cdemu.media))
534 SET_EBDA(cdemu.active, 0x01);
535
536 return 0;
537}