ide: atapi: assert that the buffer pointer is in range
[qemu.git] / hw / ide / atapi.c
1 /*
2 * QEMU ATAPI Emulation
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 * Copyright (c) 2006 Openedhand Ltd.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25
26 #include "qemu/osdep.h"
27 #include "hw/ide/internal.h"
28 #include "hw/scsi/scsi.h"
29 #include "sysemu/block-backend.h"
30 #include "trace.h"
31
32 #define ATAPI_SECTOR_BITS (2 + BDRV_SECTOR_BITS)
33 #define ATAPI_SECTOR_SIZE (1 << ATAPI_SECTOR_BITS)
34
35 static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret);
36
37 static void padstr8(uint8_t *buf, int buf_size, const char *src)
38 {
39 int i;
40 for(i = 0; i < buf_size; i++) {
41 if (*src)
42 buf[i] = *src++;
43 else
44 buf[i] = ' ';
45 }
46 }
47
48 static void lba_to_msf(uint8_t *buf, int lba)
49 {
50 lba += 150;
51 buf[0] = (lba / 75) / 60;
52 buf[1] = (lba / 75) % 60;
53 buf[2] = lba % 75;
54 }
55
56 static inline int media_present(IDEState *s)
57 {
58 return !s->tray_open && s->nb_sectors > 0;
59 }
60
61 /* XXX: DVDs that could fit on a CD will be reported as a CD */
62 static inline int media_is_dvd(IDEState *s)
63 {
64 return (media_present(s) && s->nb_sectors > CD_MAX_SECTORS);
65 }
66
67 static inline int media_is_cd(IDEState *s)
68 {
69 return (media_present(s) && s->nb_sectors <= CD_MAX_SECTORS);
70 }
71
72 static void cd_data_to_raw(uint8_t *buf, int lba)
73 {
74 /* sync bytes */
75 buf[0] = 0x00;
76 memset(buf + 1, 0xff, 10);
77 buf[11] = 0x00;
78 buf += 12;
79 /* MSF */
80 lba_to_msf(buf, lba);
81 buf[3] = 0x01; /* mode 1 data */
82 buf += 4;
83 /* data */
84 buf += 2048;
85 /* XXX: ECC not computed */
86 memset(buf, 0, 288);
87 }
88
89 static int
90 cd_read_sector_sync(IDEState *s)
91 {
92 int ret;
93 block_acct_start(blk_get_stats(s->blk), &s->acct,
94 ATAPI_SECTOR_SIZE, BLOCK_ACCT_READ);
95
96 trace_cd_read_sector_sync(s->lba);
97
98 switch (s->cd_sector_size) {
99 case 2048:
100 ret = blk_pread(s->blk, (int64_t)s->lba << ATAPI_SECTOR_BITS,
101 s->io_buffer, ATAPI_SECTOR_SIZE);
102 break;
103 case 2352:
104 ret = blk_pread(s->blk, (int64_t)s->lba << ATAPI_SECTOR_BITS,
105 s->io_buffer + 16, ATAPI_SECTOR_SIZE);
106 if (ret >= 0) {
107 cd_data_to_raw(s->io_buffer, s->lba);
108 }
109 break;
110 default:
111 block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_READ);
112 return -EIO;
113 }
114
115 if (ret < 0) {
116 block_acct_failed(blk_get_stats(s->blk), &s->acct);
117 } else {
118 block_acct_done(blk_get_stats(s->blk), &s->acct);
119 s->lba++;
120 s->io_buffer_index = 0;
121 }
122
123 return ret;
124 }
125
126 static void cd_read_sector_cb(void *opaque, int ret)
127 {
128 IDEState *s = opaque;
129
130 trace_cd_read_sector_cb(s->lba, ret);
131
132 if (ret < 0) {
133 block_acct_failed(blk_get_stats(s->blk), &s->acct);
134 ide_atapi_io_error(s, ret);
135 return;
136 }
137
138 block_acct_done(blk_get_stats(s->blk), &s->acct);
139
140 if (s->cd_sector_size == 2352) {
141 cd_data_to_raw(s->io_buffer, s->lba);
142 }
143
144 s->lba++;
145 s->io_buffer_index = 0;
146 s->status &= ~BUSY_STAT;
147
148 ide_atapi_cmd_reply_end(s);
149 }
150
151 static int cd_read_sector(IDEState *s)
152 {
153 void *buf;
154
155 if (s->cd_sector_size != 2048 && s->cd_sector_size != 2352) {
156 block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_READ);
157 return -EINVAL;
158 }
159
160 buf = (s->cd_sector_size == 2352) ? s->io_buffer + 16 : s->io_buffer;
161 qemu_iovec_init_buf(&s->qiov, buf, ATAPI_SECTOR_SIZE);
162
163 trace_cd_read_sector(s->lba);
164
165 block_acct_start(blk_get_stats(s->blk), &s->acct,
166 ATAPI_SECTOR_SIZE, BLOCK_ACCT_READ);
167
168 ide_buffered_readv(s, (int64_t)s->lba << 2, &s->qiov, 4,
169 cd_read_sector_cb, s);
170
171 s->status |= BUSY_STAT;
172 return 0;
173 }
174
175 void ide_atapi_cmd_ok(IDEState *s)
176 {
177 s->error = 0;
178 s->status = READY_STAT | SEEK_STAT;
179 s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
180 ide_transfer_stop(s);
181 ide_set_irq(s->bus);
182 }
183
184 void ide_atapi_cmd_error(IDEState *s, int sense_key, int asc)
185 {
186 trace_ide_atapi_cmd_error(s, sense_key, asc);
187 s->error = sense_key << 4;
188 s->status = READY_STAT | ERR_STAT;
189 s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
190 s->sense_key = sense_key;
191 s->asc = asc;
192 ide_transfer_stop(s);
193 ide_set_irq(s->bus);
194 }
195
196 void ide_atapi_io_error(IDEState *s, int ret)
197 {
198 /* XXX: handle more errors */
199 if (ret == -ENOMEDIUM) {
200 ide_atapi_cmd_error(s, NOT_READY,
201 ASC_MEDIUM_NOT_PRESENT);
202 } else {
203 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
204 ASC_LOGICAL_BLOCK_OOR);
205 }
206 }
207
208 static uint16_t atapi_byte_count_limit(IDEState *s)
209 {
210 uint16_t bcl;
211
212 bcl = s->lcyl | (s->hcyl << 8);
213 if (bcl == 0xffff) {
214 return 0xfffe;
215 }
216 return bcl;
217 }
218
219 /* The whole ATAPI transfer logic is handled in this function */
220 void ide_atapi_cmd_reply_end(IDEState *s)
221 {
222 int byte_count_limit, size, ret;
223 while (s->packet_transfer_size > 0) {
224 trace_ide_atapi_cmd_reply_end(s, s->packet_transfer_size,
225 s->elementary_transfer_size,
226 s->io_buffer_index);
227
228 /* see if a new sector must be read */
229 if (s->lba != -1 && s->io_buffer_index >= s->cd_sector_size) {
230 if (!s->elementary_transfer_size) {
231 ret = cd_read_sector(s);
232 if (ret < 0) {
233 ide_atapi_io_error(s, ret);
234 }
235 return;
236 } else {
237 /* rebuffering within an elementary transfer is
238 * only possible with a sync request because we
239 * end up with a race condition otherwise */
240 ret = cd_read_sector_sync(s);
241 if (ret < 0) {
242 ide_atapi_io_error(s, ret);
243 return;
244 }
245 }
246 }
247 if (s->elementary_transfer_size > 0) {
248 /* there are some data left to transmit in this elementary
249 transfer */
250 size = s->cd_sector_size - s->io_buffer_index;
251 if (size > s->elementary_transfer_size)
252 size = s->elementary_transfer_size;
253 } else {
254 /* a new transfer is needed */
255 s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO;
256 ide_set_irq(s->bus);
257 byte_count_limit = atapi_byte_count_limit(s);
258 trace_ide_atapi_cmd_reply_end_bcl(s, byte_count_limit);
259 size = s->packet_transfer_size;
260 if (size > byte_count_limit) {
261 /* byte count limit must be even if this case */
262 if (byte_count_limit & 1)
263 byte_count_limit--;
264 size = byte_count_limit;
265 }
266 s->lcyl = size;
267 s->hcyl = size >> 8;
268 s->elementary_transfer_size = size;
269 /* we cannot transmit more than one sector at a time */
270 if (s->lba != -1) {
271 if (size > (s->cd_sector_size - s->io_buffer_index))
272 size = (s->cd_sector_size - s->io_buffer_index);
273 }
274 trace_ide_atapi_cmd_reply_end_new(s, s->status);
275 }
276 s->packet_transfer_size -= size;
277 s->elementary_transfer_size -= size;
278 s->io_buffer_index += size;
279 assert(size <= s->io_buffer_total_len);
280 assert(s->io_buffer_index <= s->io_buffer_total_len);
281
282 /* Some adapters process PIO data right away. In that case, we need
283 * to avoid mutual recursion between ide_transfer_start
284 * and ide_atapi_cmd_reply_end.
285 */
286 if (!ide_transfer_start_norecurse(s,
287 s->io_buffer + s->io_buffer_index - size,
288 size, ide_atapi_cmd_reply_end)) {
289 return;
290 }
291 }
292
293 /* end of transfer */
294 trace_ide_atapi_cmd_reply_end_eot(s, s->status);
295 ide_atapi_cmd_ok(s);
296 ide_set_irq(s->bus);
297 }
298
299 /* send a reply of 'size' bytes in s->io_buffer to an ATAPI command */
300 static void ide_atapi_cmd_reply(IDEState *s, int size, int max_size)
301 {
302 if (size > max_size)
303 size = max_size;
304 s->lba = -1; /* no sector read */
305 s->packet_transfer_size = size;
306 s->io_buffer_size = size; /* dma: send the reply data as one chunk */
307 s->elementary_transfer_size = 0;
308
309 if (s->atapi_dma) {
310 block_acct_start(blk_get_stats(s->blk), &s->acct, size,
311 BLOCK_ACCT_READ);
312 s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
313 ide_start_dma(s, ide_atapi_cmd_read_dma_cb);
314 } else {
315 s->status = READY_STAT | SEEK_STAT;
316 s->io_buffer_index = 0;
317 ide_atapi_cmd_reply_end(s);
318 }
319 }
320
321 /* start a CD-CDROM read command */
322 static void ide_atapi_cmd_read_pio(IDEState *s, int lba, int nb_sectors,
323 int sector_size)
324 {
325 s->lba = lba;
326 s->packet_transfer_size = nb_sectors * sector_size;
327 s->elementary_transfer_size = 0;
328 s->io_buffer_index = sector_size;
329 s->cd_sector_size = sector_size;
330
331 ide_atapi_cmd_reply_end(s);
332 }
333
334 static void ide_atapi_cmd_check_status(IDEState *s)
335 {
336 trace_ide_atapi_cmd_check_status(s);
337 s->error = MC_ERR | (UNIT_ATTENTION << 4);
338 s->status = ERR_STAT;
339 s->nsector = 0;
340 ide_set_irq(s->bus);
341 }
342 /* ATAPI DMA support */
343
344 static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
345 {
346 IDEState *s = opaque;
347 int data_offset, n;
348
349 if (ret < 0) {
350 if (ide_handle_rw_error(s, -ret, ide_dma_cmd_to_retry(s->dma_cmd))) {
351 if (s->bus->error_status) {
352 s->bus->dma->aiocb = NULL;
353 return;
354 }
355 goto eot;
356 }
357 }
358
359 if (s->io_buffer_size > 0) {
360 /*
361 * For a cdrom read sector command (s->lba != -1),
362 * adjust the lba for the next s->io_buffer_size chunk
363 * and dma the current chunk.
364 * For a command != read (s->lba == -1), just transfer
365 * the reply data.
366 */
367 if (s->lba != -1) {
368 if (s->cd_sector_size == 2352) {
369 n = 1;
370 cd_data_to_raw(s->io_buffer, s->lba);
371 } else {
372 n = s->io_buffer_size >> 11;
373 }
374 s->lba += n;
375 }
376 s->packet_transfer_size -= s->io_buffer_size;
377 if (s->bus->dma->ops->rw_buf(s->bus->dma, 1) == 0)
378 goto eot;
379 }
380
381 if (s->packet_transfer_size <= 0) {
382 s->status = READY_STAT | SEEK_STAT;
383 s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
384 ide_set_irq(s->bus);
385 goto eot;
386 }
387
388 s->io_buffer_index = 0;
389 if (s->cd_sector_size == 2352) {
390 n = 1;
391 s->io_buffer_size = s->cd_sector_size;
392 data_offset = 16;
393 } else {
394 n = s->packet_transfer_size >> 11;
395 if (n > (IDE_DMA_BUF_SECTORS / 4))
396 n = (IDE_DMA_BUF_SECTORS / 4);
397 s->io_buffer_size = n * 2048;
398 data_offset = 0;
399 }
400 trace_ide_atapi_cmd_read_dma_cb_aio(s, s->lba, n);
401 qemu_iovec_init_buf(&s->bus->dma->qiov, s->io_buffer + data_offset,
402 n * ATAPI_SECTOR_SIZE);
403
404 s->bus->dma->aiocb = ide_buffered_readv(s, (int64_t)s->lba << 2,
405 &s->bus->dma->qiov, n * 4,
406 ide_atapi_cmd_read_dma_cb, s);
407 return;
408
409 eot:
410 if (ret < 0) {
411 block_acct_failed(blk_get_stats(s->blk), &s->acct);
412 } else {
413 block_acct_done(blk_get_stats(s->blk), &s->acct);
414 }
415 ide_set_inactive(s, false);
416 }
417
418 /* start a CD-CDROM read command with DMA */
419 /* XXX: test if DMA is available */
420 static void ide_atapi_cmd_read_dma(IDEState *s, int lba, int nb_sectors,
421 int sector_size)
422 {
423 s->lba = lba;
424 s->packet_transfer_size = nb_sectors * sector_size;
425 s->io_buffer_size = 0;
426 s->cd_sector_size = sector_size;
427
428 block_acct_start(blk_get_stats(s->blk), &s->acct, s->packet_transfer_size,
429 BLOCK_ACCT_READ);
430
431 /* XXX: check if BUSY_STAT should be set */
432 s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT;
433 ide_start_dma(s, ide_atapi_cmd_read_dma_cb);
434 }
435
436 static void ide_atapi_cmd_read(IDEState *s, int lba, int nb_sectors,
437 int sector_size)
438 {
439 trace_ide_atapi_cmd_read(s, s->atapi_dma ? "dma" : "pio",
440 lba, nb_sectors);
441 if (s->atapi_dma) {
442 ide_atapi_cmd_read_dma(s, lba, nb_sectors, sector_size);
443 } else {
444 ide_atapi_cmd_read_pio(s, lba, nb_sectors, sector_size);
445 }
446 }
447
448 void ide_atapi_dma_restart(IDEState *s)
449 {
450 /*
451 * At this point we can just re-evaluate the packet command and start over.
452 * The presence of ->dma_cb callback in the pre_save ensures that the packet
453 * command has been completely sent and we can safely restart command.
454 */
455 s->unit = s->bus->retry_unit;
456 s->bus->dma->ops->restart_dma(s->bus->dma);
457 ide_atapi_cmd(s);
458 }
459
460 static inline uint8_t ide_atapi_set_profile(uint8_t *buf, uint8_t *index,
461 uint16_t profile)
462 {
463 uint8_t *buf_profile = buf + 12; /* start of profiles */
464
465 buf_profile += ((*index) * 4); /* start of indexed profile */
466 stw_be_p(buf_profile, profile);
467 buf_profile[2] = ((buf_profile[0] == buf[6]) && (buf_profile[1] == buf[7]));
468
469 /* each profile adds 4 bytes to the response */
470 (*index)++;
471 buf[11] += 4; /* Additional Length */
472
473 return 4;
474 }
475
476 static int ide_dvd_read_structure(IDEState *s, int format,
477 const uint8_t *packet, uint8_t *buf)
478 {
479 switch (format) {
480 case 0x0: /* Physical format information */
481 {
482 int layer = packet[6];
483 uint64_t total_sectors;
484
485 if (layer != 0)
486 return -ASC_INV_FIELD_IN_CMD_PACKET;
487
488 total_sectors = s->nb_sectors >> 2;
489 if (total_sectors == 0) {
490 return -ASC_MEDIUM_NOT_PRESENT;
491 }
492
493 buf[4] = 1; /* DVD-ROM, part version 1 */
494 buf[5] = 0xf; /* 120mm disc, minimum rate unspecified */
495 buf[6] = 1; /* one layer, read-only (per MMC-2 spec) */
496 buf[7] = 0; /* default densities */
497
498 /* FIXME: 0x30000 per spec? */
499 stl_be_p(buf + 8, 0); /* start sector */
500 stl_be_p(buf + 12, total_sectors - 1); /* end sector */
501 stl_be_p(buf + 16, total_sectors - 1); /* l0 end sector */
502
503 /* Size of buffer, not including 2 byte size field */
504 stw_be_p(buf, 2048 + 2);
505
506 /* 2k data + 4 byte header */
507 return (2048 + 4);
508 }
509
510 case 0x01: /* DVD copyright information */
511 buf[4] = 0; /* no copyright data */
512 buf[5] = 0; /* no region restrictions */
513
514 /* Size of buffer, not including 2 byte size field */
515 stw_be_p(buf, 4 + 2);
516
517 /* 4 byte header + 4 byte data */
518 return (4 + 4);
519
520 case 0x03: /* BCA information - invalid field for no BCA info */
521 return -ASC_INV_FIELD_IN_CMD_PACKET;
522
523 case 0x04: /* DVD disc manufacturing information */
524 /* Size of buffer, not including 2 byte size field */
525 stw_be_p(buf, 2048 + 2);
526
527 /* 2k data + 4 byte header */
528 return (2048 + 4);
529
530 case 0xff:
531 /*
532 * This lists all the command capabilities above. Add new ones
533 * in order and update the length and buffer return values.
534 */
535
536 buf[4] = 0x00; /* Physical format */
537 buf[5] = 0x40; /* Not writable, is readable */
538 stw_be_p(buf + 6, 2048 + 4);
539
540 buf[8] = 0x01; /* Copyright info */
541 buf[9] = 0x40; /* Not writable, is readable */
542 stw_be_p(buf + 10, 4 + 4);
543
544 buf[12] = 0x03; /* BCA info */
545 buf[13] = 0x40; /* Not writable, is readable */
546 stw_be_p(buf + 14, 188 + 4);
547
548 buf[16] = 0x04; /* Manufacturing info */
549 buf[17] = 0x40; /* Not writable, is readable */
550 stw_be_p(buf + 18, 2048 + 4);
551
552 /* Size of buffer, not including 2 byte size field */
553 stw_be_p(buf, 16 + 2);
554
555 /* data written + 4 byte header */
556 return (16 + 4);
557
558 default: /* TODO: formats beyond DVD-ROM requires */
559 return -ASC_INV_FIELD_IN_CMD_PACKET;
560 }
561 }
562
563 static unsigned int event_status_media(IDEState *s,
564 uint8_t *buf)
565 {
566 uint8_t event_code, media_status;
567
568 media_status = 0;
569 if (s->tray_open) {
570 media_status = MS_TRAY_OPEN;
571 } else if (blk_is_inserted(s->blk)) {
572 media_status = MS_MEDIA_PRESENT;
573 }
574
575 /* Event notification descriptor */
576 event_code = MEC_NO_CHANGE;
577 if (media_status != MS_TRAY_OPEN) {
578 if (s->events.new_media) {
579 event_code = MEC_NEW_MEDIA;
580 s->events.new_media = false;
581 } else if (s->events.eject_request) {
582 event_code = MEC_EJECT_REQUESTED;
583 s->events.eject_request = false;
584 }
585 }
586
587 buf[4] = event_code;
588 buf[5] = media_status;
589
590 /* These fields are reserved, just clear them. */
591 buf[6] = 0;
592 buf[7] = 0;
593
594 return 8; /* We wrote to 4 extra bytes from the header */
595 }
596
597 /*
598 * Before transferring data or otherwise signalling acceptance of a command
599 * marked CONDDATA, we must check the validity of the byte_count_limit.
600 */
601 static bool validate_bcl(IDEState *s)
602 {
603 /* TODO: Check IDENTIFY data word 125 for defacult BCL (currently 0) */
604 if (s->atapi_dma || atapi_byte_count_limit(s)) {
605 return true;
606 }
607
608 /* TODO: Move abort back into core.c and introduce proper error flow between
609 * ATAPI layer and IDE core layer */
610 ide_abort_command(s);
611 return false;
612 }
613
614 static void cmd_get_event_status_notification(IDEState *s,
615 uint8_t *buf)
616 {
617 const uint8_t *packet = buf;
618
619 struct {
620 uint8_t opcode;
621 uint8_t polled; /* lsb bit is polled; others are reserved */
622 uint8_t reserved2[2];
623 uint8_t class;
624 uint8_t reserved3[2];
625 uint16_t len;
626 uint8_t control;
627 } QEMU_PACKED *gesn_cdb;
628
629 struct {
630 uint16_t len;
631 uint8_t notification_class;
632 uint8_t supported_events;
633 } QEMU_PACKED *gesn_event_header;
634 unsigned int max_len, used_len;
635
636 gesn_cdb = (void *)packet;
637 gesn_event_header = (void *)buf;
638
639 max_len = be16_to_cpu(gesn_cdb->len);
640
641 /* It is fine by the MMC spec to not support async mode operations */
642 if (!(gesn_cdb->polled & 0x01)) { /* asynchronous mode */
643 /* Only polling is supported, asynchronous mode is not. */
644 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
645 ASC_INV_FIELD_IN_CMD_PACKET);
646 return;
647 }
648
649 /* polling mode operation */
650
651 /*
652 * These are the supported events.
653 *
654 * We currently only support requests of the 'media' type.
655 * Notification class requests and supported event classes are bitmasks,
656 * but they are build from the same values as the "notification class"
657 * field.
658 */
659 gesn_event_header->supported_events = 1 << GESN_MEDIA;
660
661 /*
662 * We use |= below to set the class field; other bits in this byte
663 * are reserved now but this is useful to do if we have to use the
664 * reserved fields later.
665 */
666 gesn_event_header->notification_class = 0;
667
668 /*
669 * Responses to requests are to be based on request priority. The
670 * notification_class_request_type enum above specifies the
671 * priority: upper elements are higher prio than lower ones.
672 */
673 if (gesn_cdb->class & (1 << GESN_MEDIA)) {
674 gesn_event_header->notification_class |= GESN_MEDIA;
675 used_len = event_status_media(s, buf);
676 } else {
677 gesn_event_header->notification_class = 0x80; /* No event available */
678 used_len = sizeof(*gesn_event_header);
679 }
680 gesn_event_header->len = cpu_to_be16(used_len
681 - sizeof(*gesn_event_header));
682 ide_atapi_cmd_reply(s, used_len, max_len);
683 }
684
685 static void cmd_request_sense(IDEState *s, uint8_t *buf)
686 {
687 int max_len = buf[4];
688
689 memset(buf, 0, 18);
690 buf[0] = 0x70 | (1 << 7);
691 buf[2] = s->sense_key;
692 buf[7] = 10;
693 buf[12] = s->asc;
694
695 if (s->sense_key == UNIT_ATTENTION) {
696 s->sense_key = NO_SENSE;
697 }
698
699 ide_atapi_cmd_reply(s, 18, max_len);
700 }
701
702 static void cmd_inquiry(IDEState *s, uint8_t *buf)
703 {
704 uint8_t page_code = buf[2];
705 int max_len = buf[4];
706
707 unsigned idx = 0;
708 unsigned size_idx;
709 unsigned preamble_len;
710
711 /* If the EVPD (Enable Vital Product Data) bit is set in byte 1,
712 * we are being asked for a specific page of info indicated by byte 2. */
713 if (buf[1] & 0x01) {
714 preamble_len = 4;
715 size_idx = 3;
716
717 buf[idx++] = 0x05; /* CD-ROM */
718 buf[idx++] = page_code; /* Page Code */
719 buf[idx++] = 0x00; /* reserved */
720 idx++; /* length (set later) */
721
722 switch (page_code) {
723 case 0x00:
724 /* Supported Pages: List of supported VPD responses. */
725 buf[idx++] = 0x00; /* 0x00: Supported Pages, and: */
726 buf[idx++] = 0x83; /* 0x83: Device Identification. */
727 break;
728
729 case 0x83:
730 /* Device Identification. Each entry is optional, but the entries
731 * included here are modeled after libata's VPD responses.
732 * If the response is given, at least one entry must be present. */
733
734 /* Entry 1: Serial */
735 if (idx + 24 > max_len) {
736 /* Not enough room for even the first entry: */
737 /* 4 byte header + 20 byte string */
738 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
739 ASC_DATA_PHASE_ERROR);
740 return;
741 }
742 buf[idx++] = 0x02; /* Ascii */
743 buf[idx++] = 0x00; /* Vendor Specific */
744 buf[idx++] = 0x00;
745 buf[idx++] = 20; /* Remaining length */
746 padstr8(buf + idx, 20, s->drive_serial_str);
747 idx += 20;
748
749 /* Entry 2: Drive Model and Serial */
750 if (idx + 72 > max_len) {
751 /* 4 (header) + 8 (vendor) + 60 (model & serial) */
752 goto out;
753 }
754 buf[idx++] = 0x02; /* Ascii */
755 buf[idx++] = 0x01; /* T10 Vendor */
756 buf[idx++] = 0x00;
757 buf[idx++] = 68;
758 padstr8(buf + idx, 8, "ATA"); /* Generic T10 vendor */
759 idx += 8;
760 padstr8(buf + idx, 40, s->drive_model_str);
761 idx += 40;
762 padstr8(buf + idx, 20, s->drive_serial_str);
763 idx += 20;
764
765 /* Entry 3: WWN */
766 if (s->wwn && (idx + 12 <= max_len)) {
767 /* 4 byte header + 8 byte wwn */
768 buf[idx++] = 0x01; /* Binary */
769 buf[idx++] = 0x03; /* NAA */
770 buf[idx++] = 0x00;
771 buf[idx++] = 0x08;
772 stq_be_p(&buf[idx], s->wwn);
773 idx += 8;
774 }
775 break;
776
777 default:
778 /* SPC-3, revision 23 sec. 6.4 */
779 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
780 ASC_INV_FIELD_IN_CMD_PACKET);
781 return;
782 }
783 } else {
784 preamble_len = 5;
785 size_idx = 4;
786
787 buf[0] = 0x05; /* CD-ROM */
788 buf[1] = 0x80; /* removable */
789 buf[2] = 0x00; /* ISO */
790 buf[3] = 0x21; /* ATAPI-2 (XXX: put ATAPI-4 ?) */
791 /* buf[size_idx] set below. */
792 buf[5] = 0; /* reserved */
793 buf[6] = 0; /* reserved */
794 buf[7] = 0; /* reserved */
795 padstr8(buf + 8, 8, "QEMU");
796 padstr8(buf + 16, 16, "QEMU DVD-ROM");
797 padstr8(buf + 32, 4, s->version);
798 idx = 36;
799 }
800
801 out:
802 buf[size_idx] = idx - preamble_len;
803 ide_atapi_cmd_reply(s, idx, max_len);
804 }
805
806 static void cmd_get_configuration(IDEState *s, uint8_t *buf)
807 {
808 uint32_t len;
809 uint8_t index = 0;
810 int max_len;
811
812 /* only feature 0 is supported */
813 if (buf[2] != 0 || buf[3] != 0) {
814 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
815 ASC_INV_FIELD_IN_CMD_PACKET);
816 return;
817 }
818
819 /* XXX: could result in alignment problems in some architectures */
820 max_len = lduw_be_p(buf + 7);
821
822 /*
823 * XXX: avoid overflow for io_buffer if max_len is bigger than
824 * the size of that buffer (dimensioned to max number of
825 * sectors to transfer at once)
826 *
827 * Only a problem if the feature/profiles grow.
828 */
829 if (max_len > BDRV_SECTOR_SIZE) {
830 /* XXX: assume 1 sector */
831 max_len = BDRV_SECTOR_SIZE;
832 }
833
834 memset(buf, 0, max_len);
835 /*
836 * the number of sectors from the media tells us which profile
837 * to use as current. 0 means there is no media
838 */
839 if (media_is_dvd(s)) {
840 stw_be_p(buf + 6, MMC_PROFILE_DVD_ROM);
841 } else if (media_is_cd(s)) {
842 stw_be_p(buf + 6, MMC_PROFILE_CD_ROM);
843 }
844
845 buf[10] = 0x02 | 0x01; /* persistent and current */
846 len = 12; /* headers: 8 + 4 */
847 len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_DVD_ROM);
848 len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_CD_ROM);
849 stl_be_p(buf, len - 4); /* data length */
850
851 ide_atapi_cmd_reply(s, len, max_len);
852 }
853
854 static void cmd_mode_sense(IDEState *s, uint8_t *buf)
855 {
856 int action, code;
857 int max_len;
858
859 max_len = lduw_be_p(buf + 7);
860 action = buf[2] >> 6;
861 code = buf[2] & 0x3f;
862
863 switch(action) {
864 case 0: /* current values */
865 switch(code) {
866 case MODE_PAGE_R_W_ERROR: /* error recovery */
867 stw_be_p(&buf[0], 16 - 2);
868 buf[2] = 0x70;
869 buf[3] = 0;
870 buf[4] = 0;
871 buf[5] = 0;
872 buf[6] = 0;
873 buf[7] = 0;
874
875 buf[8] = MODE_PAGE_R_W_ERROR;
876 buf[9] = 16 - 10;
877 buf[10] = 0x00;
878 buf[11] = 0x05;
879 buf[12] = 0x00;
880 buf[13] = 0x00;
881 buf[14] = 0x00;
882 buf[15] = 0x00;
883 ide_atapi_cmd_reply(s, 16, max_len);
884 break;
885 case MODE_PAGE_AUDIO_CTL:
886 stw_be_p(&buf[0], 24 - 2);
887 buf[2] = 0x70;
888 buf[3] = 0;
889 buf[4] = 0;
890 buf[5] = 0;
891 buf[6] = 0;
892 buf[7] = 0;
893
894 buf[8] = MODE_PAGE_AUDIO_CTL;
895 buf[9] = 24 - 10;
896 /* Fill with CDROM audio volume */
897 buf[17] = 0;
898 buf[19] = 0;
899 buf[21] = 0;
900 buf[23] = 0;
901
902 ide_atapi_cmd_reply(s, 24, max_len);
903 break;
904 case MODE_PAGE_CAPABILITIES:
905 stw_be_p(&buf[0], 30 - 2);
906 buf[2] = 0x70;
907 buf[3] = 0;
908 buf[4] = 0;
909 buf[5] = 0;
910 buf[6] = 0;
911 buf[7] = 0;
912
913 buf[8] = MODE_PAGE_CAPABILITIES;
914 buf[9] = 30 - 10;
915 buf[10] = 0x3b; /* read CDR/CDRW/DVDROM/DVDR/DVDRAM */
916 buf[11] = 0x00;
917
918 /* Claim PLAY_AUDIO capability (0x01) since some Linux
919 code checks for this to automount media. */
920 buf[12] = 0x71;
921 buf[13] = 3 << 5;
922 buf[14] = (1 << 0) | (1 << 3) | (1 << 5);
923 if (s->tray_locked) {
924 buf[14] |= 1 << 1;
925 }
926 buf[15] = 0x00; /* No volume & mute control, no changer */
927 stw_be_p(&buf[16], 704); /* 4x read speed */
928 buf[18] = 0; /* Two volume levels */
929 buf[19] = 2;
930 stw_be_p(&buf[20], 512); /* 512k buffer */
931 stw_be_p(&buf[22], 704); /* 4x read speed current */
932 buf[24] = 0;
933 buf[25] = 0;
934 buf[26] = 0;
935 buf[27] = 0;
936 buf[28] = 0;
937 buf[29] = 0;
938 ide_atapi_cmd_reply(s, 30, max_len);
939 break;
940 default:
941 goto error_cmd;
942 }
943 break;
944 case 1: /* changeable values */
945 goto error_cmd;
946 case 2: /* default values */
947 goto error_cmd;
948 default:
949 case 3: /* saved values */
950 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
951 ASC_SAVING_PARAMETERS_NOT_SUPPORTED);
952 break;
953 }
954 return;
955
956 error_cmd:
957 ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_INV_FIELD_IN_CMD_PACKET);
958 }
959
960 static void cmd_test_unit_ready(IDEState *s, uint8_t *buf)
961 {
962 /* Not Ready Conditions are already handled in ide_atapi_cmd(), so if we
963 * come here, we know that it's ready. */
964 ide_atapi_cmd_ok(s);
965 }
966
967 static void cmd_prevent_allow_medium_removal(IDEState *s, uint8_t* buf)
968 {
969 s->tray_locked = buf[4] & 1;
970 blk_lock_medium(s->blk, buf[4] & 1);
971 ide_atapi_cmd_ok(s);
972 }
973
974 static void cmd_read(IDEState *s, uint8_t* buf)
975 {
976 int nb_sectors, lba;
977
978 if (buf[0] == GPCMD_READ_10) {
979 nb_sectors = lduw_be_p(buf + 7);
980 } else {
981 nb_sectors = ldl_be_p(buf + 6);
982 }
983
984 lba = ldl_be_p(buf + 2);
985 if (nb_sectors == 0) {
986 ide_atapi_cmd_ok(s);
987 return;
988 }
989
990 ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
991 }
992
993 static void cmd_read_cd(IDEState *s, uint8_t* buf)
994 {
995 int nb_sectors, lba, transfer_request;
996
997 nb_sectors = (buf[6] << 16) | (buf[7] << 8) | buf[8];
998 lba = ldl_be_p(buf + 2);
999
1000 if (nb_sectors == 0) {
1001 ide_atapi_cmd_ok(s);
1002 return;
1003 }
1004
1005 transfer_request = buf[9] & 0xf8;
1006 if (transfer_request == 0x00) {
1007 /* nothing */
1008 ide_atapi_cmd_ok(s);
1009 return;
1010 }
1011
1012 /* Check validity of BCL before transferring data */
1013 if (!validate_bcl(s)) {
1014 return;
1015 }
1016
1017 switch (transfer_request) {
1018 case 0x10:
1019 /* normal read */
1020 ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
1021 break;
1022 case 0xf8:
1023 /* read all data */
1024 ide_atapi_cmd_read(s, lba, nb_sectors, 2352);
1025 break;
1026 default:
1027 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
1028 ASC_INV_FIELD_IN_CMD_PACKET);
1029 break;
1030 }
1031 }
1032
1033 static void cmd_seek(IDEState *s, uint8_t* buf)
1034 {
1035 unsigned int lba;
1036 uint64_t total_sectors = s->nb_sectors >> 2;
1037
1038 lba = ldl_be_p(buf + 2);
1039 if (lba >= total_sectors) {
1040 ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_LOGICAL_BLOCK_OOR);
1041 return;
1042 }
1043
1044 ide_atapi_cmd_ok(s);
1045 }
1046
1047 static void cmd_start_stop_unit(IDEState *s, uint8_t* buf)
1048 {
1049 int sense;
1050 bool start = buf[4] & 1;
1051 bool loej = buf[4] & 2; /* load on start, eject on !start */
1052 int pwrcnd = buf[4] & 0xf0;
1053
1054 if (pwrcnd) {
1055 /* eject/load only happens for power condition == 0 */
1056 ide_atapi_cmd_ok(s);
1057 return;
1058 }
1059
1060 if (loej) {
1061 if (!start && !s->tray_open && s->tray_locked) {
1062 sense = blk_is_inserted(s->blk)
1063 ? NOT_READY : ILLEGAL_REQUEST;
1064 ide_atapi_cmd_error(s, sense, ASC_MEDIA_REMOVAL_PREVENTED);
1065 return;
1066 }
1067
1068 if (s->tray_open != !start) {
1069 blk_eject(s->blk, !start);
1070 s->tray_open = !start;
1071 }
1072 }
1073
1074 ide_atapi_cmd_ok(s);
1075 }
1076
1077 static void cmd_mechanism_status(IDEState *s, uint8_t* buf)
1078 {
1079 int max_len = lduw_be_p(buf + 8);
1080
1081 stw_be_p(buf, 0);
1082 /* no current LBA */
1083 buf[2] = 0;
1084 buf[3] = 0;
1085 buf[4] = 0;
1086 buf[5] = 1;
1087 stw_be_p(buf + 6, 0);
1088 ide_atapi_cmd_reply(s, 8, max_len);
1089 }
1090
1091 static void cmd_read_toc_pma_atip(IDEState *s, uint8_t* buf)
1092 {
1093 int format, msf, start_track, len;
1094 int max_len;
1095 uint64_t total_sectors = s->nb_sectors >> 2;
1096
1097 max_len = lduw_be_p(buf + 7);
1098 format = buf[9] >> 6;
1099 msf = (buf[1] >> 1) & 1;
1100 start_track = buf[6];
1101
1102 switch(format) {
1103 case 0:
1104 len = cdrom_read_toc(total_sectors, buf, msf, start_track);
1105 if (len < 0)
1106 goto error_cmd;
1107 ide_atapi_cmd_reply(s, len, max_len);
1108 break;
1109 case 1:
1110 /* multi session : only a single session defined */
1111 memset(buf, 0, 12);
1112 buf[1] = 0x0a;
1113 buf[2] = 0x01;
1114 buf[3] = 0x01;
1115 ide_atapi_cmd_reply(s, 12, max_len);
1116 break;
1117 case 2:
1118 len = cdrom_read_toc_raw(total_sectors, buf, msf, start_track);
1119 if (len < 0)
1120 goto error_cmd;
1121 ide_atapi_cmd_reply(s, len, max_len);
1122 break;
1123 default:
1124 error_cmd:
1125 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
1126 ASC_INV_FIELD_IN_CMD_PACKET);
1127 }
1128 }
1129
1130 static void cmd_read_cdvd_capacity(IDEState *s, uint8_t* buf)
1131 {
1132 uint64_t total_sectors = s->nb_sectors >> 2;
1133
1134 /* NOTE: it is really the number of sectors minus 1 */
1135 stl_be_p(buf, total_sectors - 1);
1136 stl_be_p(buf + 4, 2048);
1137 ide_atapi_cmd_reply(s, 8, 8);
1138 }
1139
1140 static void cmd_read_disc_information(IDEState *s, uint8_t* buf)
1141 {
1142 uint8_t type = buf[1] & 7;
1143 uint32_t max_len = lduw_be_p(buf + 7);
1144
1145 /* Types 1/2 are only defined for Blu-Ray. */
1146 if (type != 0) {
1147 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
1148 ASC_INV_FIELD_IN_CMD_PACKET);
1149 return;
1150 }
1151
1152 memset(buf, 0, 34);
1153 buf[1] = 32;
1154 buf[2] = 0xe; /* last session complete, disc finalized */
1155 buf[3] = 1; /* first track on disc */
1156 buf[4] = 1; /* # of sessions */
1157 buf[5] = 1; /* first track of last session */
1158 buf[6] = 1; /* last track of last session */
1159 buf[7] = 0x20; /* unrestricted use */
1160 buf[8] = 0x00; /* CD-ROM or DVD-ROM */
1161 /* 9-10-11: most significant byte corresponding bytes 4-5-6 */
1162 /* 12-23: not meaningful for CD-ROM or DVD-ROM */
1163 /* 24-31: disc bar code */
1164 /* 32: disc application code */
1165 /* 33: number of OPC tables */
1166
1167 ide_atapi_cmd_reply(s, 34, max_len);
1168 }
1169
1170 static void cmd_read_dvd_structure(IDEState *s, uint8_t* buf)
1171 {
1172 int max_len;
1173 int media = buf[1];
1174 int format = buf[7];
1175 int ret;
1176
1177 max_len = lduw_be_p(buf + 8);
1178
1179 if (format < 0xff) {
1180 if (media_is_cd(s)) {
1181 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
1182 ASC_INCOMPATIBLE_FORMAT);
1183 return;
1184 } else if (!media_present(s)) {
1185 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
1186 ASC_INV_FIELD_IN_CMD_PACKET);
1187 return;
1188 }
1189 }
1190
1191 memset(buf, 0, max_len > IDE_DMA_BUF_SECTORS * BDRV_SECTOR_SIZE + 4 ?
1192 IDE_DMA_BUF_SECTORS * BDRV_SECTOR_SIZE + 4 : max_len);
1193
1194 switch (format) {
1195 case 0x00 ... 0x7f:
1196 case 0xff:
1197 if (media == 0) {
1198 ret = ide_dvd_read_structure(s, format, buf, buf);
1199
1200 if (ret < 0) {
1201 ide_atapi_cmd_error(s, ILLEGAL_REQUEST, -ret);
1202 } else {
1203 ide_atapi_cmd_reply(s, ret, max_len);
1204 }
1205
1206 break;
1207 }
1208 /* TODO: BD support, fall through for now */
1209
1210 /* Generic disk structures */
1211 case 0x80: /* TODO: AACS volume identifier */
1212 case 0x81: /* TODO: AACS media serial number */
1213 case 0x82: /* TODO: AACS media identifier */
1214 case 0x83: /* TODO: AACS media key block */
1215 case 0x90: /* TODO: List of recognized format layers */
1216 case 0xc0: /* TODO: Write protection status */
1217 default:
1218 ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
1219 ASC_INV_FIELD_IN_CMD_PACKET);
1220 break;
1221 }
1222 }
1223
1224 static void cmd_set_speed(IDEState *s, uint8_t* buf)
1225 {
1226 ide_atapi_cmd_ok(s);
1227 }
1228
1229 enum {
1230 /*
1231 * Only commands flagged as ALLOW_UA are allowed to run under a
1232 * unit attention condition. (See MMC-5, section 4.1.6.1)
1233 */
1234 ALLOW_UA = 0x01,
1235
1236 /*
1237 * Commands flagged with CHECK_READY can only execute if a medium is present.
1238 * Otherwise they report the Not Ready Condition. (See MMC-5, section
1239 * 4.1.8)
1240 */
1241 CHECK_READY = 0x02,
1242
1243 /*
1244 * Commands flagged with NONDATA do not in any circumstances return
1245 * any data via ide_atapi_cmd_reply. These commands are exempt from
1246 * the normal byte_count_limit constraints.
1247 * See ATA8-ACS3 "7.21.5 Byte Count Limit"
1248 */
1249 NONDATA = 0x04,
1250
1251 /*
1252 * CONDDATA implies a command that transfers data only conditionally based
1253 * on the presence of suboptions. It should be exempt from the BCL check at
1254 * command validation time, but it needs to be checked at the command
1255 * handler level instead.
1256 */
1257 CONDDATA = 0x08,
1258 };
1259
1260 static const struct AtapiCmd {
1261 void (*handler)(IDEState *s, uint8_t *buf);
1262 int flags;
1263 } atapi_cmd_table[0x100] = {
1264 [ 0x00 ] = { cmd_test_unit_ready, CHECK_READY | NONDATA },
1265 [ 0x03 ] = { cmd_request_sense, ALLOW_UA },
1266 [ 0x12 ] = { cmd_inquiry, ALLOW_UA },
1267 [ 0x1b ] = { cmd_start_stop_unit, NONDATA }, /* [1] */
1268 [ 0x1e ] = { cmd_prevent_allow_medium_removal, NONDATA },
1269 [ 0x25 ] = { cmd_read_cdvd_capacity, CHECK_READY },
1270 [ 0x28 ] = { cmd_read, /* (10) */ CHECK_READY },
1271 [ 0x2b ] = { cmd_seek, CHECK_READY | NONDATA },
1272 [ 0x43 ] = { cmd_read_toc_pma_atip, CHECK_READY },
1273 [ 0x46 ] = { cmd_get_configuration, ALLOW_UA },
1274 [ 0x4a ] = { cmd_get_event_status_notification, ALLOW_UA },
1275 [ 0x51 ] = { cmd_read_disc_information, CHECK_READY },
1276 [ 0x5a ] = { cmd_mode_sense, /* (10) */ 0 },
1277 [ 0xa8 ] = { cmd_read, /* (12) */ CHECK_READY },
1278 [ 0xad ] = { cmd_read_dvd_structure, CHECK_READY },
1279 [ 0xbb ] = { cmd_set_speed, NONDATA },
1280 [ 0xbd ] = { cmd_mechanism_status, 0 },
1281 [ 0xbe ] = { cmd_read_cd, CHECK_READY | CONDDATA },
1282 /* [1] handler detects and reports not ready condition itself */
1283 };
1284
1285 void ide_atapi_cmd(IDEState *s)
1286 {
1287 uint8_t *buf = s->io_buffer;
1288 const struct AtapiCmd *cmd = &atapi_cmd_table[s->io_buffer[0]];
1289
1290 trace_ide_atapi_cmd(s, s->io_buffer[0]);
1291
1292 if (trace_event_get_state_backends(TRACE_IDE_ATAPI_CMD_PACKET)) {
1293 /* Each pretty-printed byte needs two bytes and a space; */
1294 char *ppacket = g_malloc(ATAPI_PACKET_SIZE * 3 + 1);
1295 int i;
1296 for (i = 0; i < ATAPI_PACKET_SIZE; i++) {
1297 sprintf(ppacket + (i * 3), "%02x ", buf[i]);
1298 }
1299 trace_ide_atapi_cmd_packet(s, s->lcyl | (s->hcyl << 8), ppacket);
1300 g_free(ppacket);
1301 }
1302
1303 /*
1304 * If there's a UNIT_ATTENTION condition pending, only command flagged with
1305 * ALLOW_UA are allowed to complete. with other commands getting a CHECK
1306 * condition response unless a higher priority status, defined by the drive
1307 * here, is pending.
1308 */
1309 if (s->sense_key == UNIT_ATTENTION && !(cmd->flags & ALLOW_UA)) {
1310 ide_atapi_cmd_check_status(s);
1311 return;
1312 }
1313 /*
1314 * When a CD gets changed, we have to report an ejected state and
1315 * then a loaded state to guests so that they detect tray
1316 * open/close and media change events. Guests that do not use
1317 * GET_EVENT_STATUS_NOTIFICATION to detect such tray open/close
1318 * states rely on this behavior.
1319 */
1320 if (!(cmd->flags & ALLOW_UA) &&
1321 !s->tray_open && blk_is_inserted(s->blk) && s->cdrom_changed) {
1322
1323 if (s->cdrom_changed == 1) {
1324 ide_atapi_cmd_error(s, NOT_READY, ASC_MEDIUM_NOT_PRESENT);
1325 s->cdrom_changed = 2;
1326 } else {
1327 ide_atapi_cmd_error(s, UNIT_ATTENTION, ASC_MEDIUM_MAY_HAVE_CHANGED);
1328 s->cdrom_changed = 0;
1329 }
1330
1331 return;
1332 }
1333
1334 /* Report a Not Ready condition if appropriate for the command */
1335 if ((cmd->flags & CHECK_READY) &&
1336 (!media_present(s) || !blk_is_inserted(s->blk)))
1337 {
1338 ide_atapi_cmd_error(s, NOT_READY, ASC_MEDIUM_NOT_PRESENT);
1339 return;
1340 }
1341
1342 /* Commands that don't transfer DATA permit the byte_count_limit to be 0.
1343 * If this is a data-transferring PIO command and BCL is 0,
1344 * we abort at the /ATA/ level, not the ATAPI level.
1345 * See ATA8 ACS3 section 7.17.6.49 and 7.21.5 */
1346 if (cmd->handler && !(cmd->flags & (NONDATA | CONDDATA))) {
1347 if (!validate_bcl(s)) {
1348 return;
1349 }
1350 }
1351
1352 /* Execute the command */
1353 if (cmd->handler) {
1354 cmd->handler(s, buf);
1355 return;
1356 }
1357
1358 ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_ILLEGAL_OPCODE);
1359 }