cdrom.c revision 8b23a6c7e1aee255004dd19098d4c2462b61b849 
1/*
2 * QEMU ATAPI CD-ROM Emulator
3 *
4 * Copyright (c) 2006 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25/* ??? Most of the ATAPI emulation is still in ide.c.  It should be moved
26   here.  */
27
28#include "qemu-common.h"
29#include "scsi-disk.h"
30
31static void lba_to_msf(uint8_t *buf, int lba)
32{
33    lba += 150;
34    buf[0] = (lba / 75) / 60;
35    buf[1] = (lba / 75) % 60;
36    buf[2] = lba % 75;
37}
38
39/* same toc as bochs. Return -1 if error or the toc length */
40/* XXX: check this */
41int cdrom_read_toc(int nb_sectors, uint8_t *buf, int msf, int start_track)
42{
43    uint8_t *q;
44    int len;
45
46    if (start_track > 1 && start_track != 0xaa)
47        return -1;
48    q = buf + 2;
49    *q++ = 1; /* first session */
50    *q++ = 1; /* last session */
51    if (start_track <= 1) {
52        *q++ = 0; /* reserved */
53        *q++ = 0x14; /* ADR, control */
54        *q++ = 1;    /* track number */
55        *q++ = 0; /* reserved */
56        if (msf) {
57            *q++ = 0; /* reserved */
58            lba_to_msf(q, 0);
59            q += 3;
60        } else {
61            /* sector 0 */
62            cpu_to_be32wu((uint32_t *)q, 0);
63            q += 4;
64        }
65    }
66    /* lead out track */
67    *q++ = 0; /* reserved */
68    *q++ = 0x16; /* ADR, control */
69    *q++ = 0xaa; /* track number */
70    *q++ = 0; /* reserved */
71    if (msf) {
72        *q++ = 0; /* reserved */
73        lba_to_msf(q, nb_sectors);
74        q += 3;
75    } else {
76        cpu_to_be32wu((uint32_t *)q, nb_sectors);
77        q += 4;
78    }
79    len = q - buf;
80    cpu_to_be16wu((uint16_t *)buf, len - 2);
81    return len;
82}
83
84/* mostly same info as PearPc */
85int cdrom_read_toc_raw(int nb_sectors, uint8_t *buf, int msf, int session_num)
86{
87    uint8_t *q;
88    int len;
89
90    q = buf + 2;
91    *q++ = 1; /* first session */
92    *q++ = 1; /* last session */
93
94    *q++ = 1; /* session number */
95    *q++ = 0x14; /* data track */
96    *q++ = 0; /* track number */
97    *q++ = 0xa0; /* lead-in */
98    *q++ = 0; /* min */
99    *q++ = 0; /* sec */
100    *q++ = 0; /* frame */
101    *q++ = 0;
102    *q++ = 1; /* first track */
103    *q++ = 0x00; /* disk type */
104    *q++ = 0x00;
105
106    *q++ = 1; /* session number */
107    *q++ = 0x14; /* data track */
108    *q++ = 0; /* track number */
109    *q++ = 0xa1;
110    *q++ = 0; /* min */
111    *q++ = 0; /* sec */
112    *q++ = 0; /* frame */
113    *q++ = 0;
114    *q++ = 1; /* last track */
115    *q++ = 0x00;
116    *q++ = 0x00;
117
118    *q++ = 1; /* session number */
119    *q++ = 0x14; /* data track */
120    *q++ = 0; /* track number */
121    *q++ = 0xa2; /* lead-out */
122    *q++ = 0; /* min */
123    *q++ = 0; /* sec */
124    *q++ = 0; /* frame */
125    if (msf) {
126        *q++ = 0; /* reserved */
127        lba_to_msf(q, nb_sectors);
128        q += 3;
129    } else {
130        cpu_to_be32wu((uint32_t *)q, nb_sectors);
131        q += 4;
132    }
133
134    *q++ = 1; /* session number */
135    *q++ = 0x14; /* ADR, control */
136    *q++ = 0;    /* track number */
137    *q++ = 1;    /* point */
138    *q++ = 0; /* min */
139    *q++ = 0; /* sec */
140    *q++ = 0; /* frame */
141    if (msf) {
142        *q++ = 0;
143        lba_to_msf(q, 0);
144        q += 3;
145    } else {
146        *q++ = 0;
147        *q++ = 0;
148        *q++ = 0;
149        *q++ = 0;
150    }
151
152    len = q - buf;
153    cpu_to_be16wu((uint16_t *)buf, len - 2);
154    return len;
155}
156
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