hw/cdrom.c

   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 <vl.h>
  29
  30 static void lba_to_msf(uint8_t *buf, int lba)
  31 {
  32     lba += 150;
  33     buf[0] = (lba / 75) / 60;
  34     buf[1] = (lba / 75) % 60;
  35     buf[2] = lba % 75;
  36 }
  37
  38 /* same toc as bochs. Return -1 if error or the toc length */
  39 /* XXX: check this */
  40 int cdrom_read_toc(int nb_sectors, uint8_t *buf, int msf, int start_track)
  41 {
  42     uint8_t *q;
  43     int len;
  44
  45     if (start_track > 1 && start_track != 0xaa)
  46         return -1;
  47     q = buf + 2;
  48     *q++ = 1; /* first session */
  49     *q++ = 1; /* last session */
  50     if (start_track <= 1) {
  51         *q++ = 0; /* reserved */
  52         *q++ = 0x14; /* ADR, control */
  53         *q++ = 1;    /* track number */
  54         *q++ = 0; /* reserved */
  55         if (msf) {
  56             *q++ = 0; /* reserved */
  57             lba_to_msf(q, 0);
  58             q += 3;
  59         } else {
  60             /* sector 0 */
  61             cpu_to_be32wu((uint32_t *)q, 0);
  62             q += 4;
  63         }
  64     }
  65     /* lead out track */
  66     *q++ = 0; /* reserved */
  67     *q++ = 0x16; /* ADR, control */
  68     *q++ = 0xaa; /* track number */
  69     *q++ = 0; /* reserved */
  70     if (msf) {
  71         *q++ = 0; /* reserved */
  72         lba_to_msf(q, nb_sectors);
  73         q += 3;
  74     } else {
  75         cpu_to_be32wu((uint32_t *)q, nb_sectors);
  76         q += 4;
  77     }
  78     len = q - buf;
  79     cpu_to_be16wu((uint16_t *)buf, len - 2);
  80     return len;
  81 }
  82
  83 /* mostly same info as PearPc */
  84 int cdrom_read_toc_raw(int nb_sectors, uint8_t *buf, int msf, int session_num)
  85 {
  86     uint8_t *q;
  87     int len;
  88
  89     q = buf + 2;
  90     *q++ = 1; /* first session */
  91     *q++ = 1; /* last session */
  92
  93     *q++ = 1; /* session number */
  94     *q++ = 0x14; /* data track */
  95     *q++ = 0; /* track number */
  96     *q++ = 0xa0; /* lead-in */
  97     *q++ = 0; /* min */
  98     *q++ = 0; /* sec */
  99     *q++ = 0; /* frame */
 100     *q++ = 0;
 101     *q++ = 1; /* first track */
 102     *q++ = 0x00; /* disk type */
 103     *q++ = 0x00;
 104
 105     *q++ = 1; /* session number */
 106     *q++ = 0x14; /* data track */
 107     *q++ = 0; /* track number */
 108     *q++ = 0xa1;
 109     *q++ = 0; /* min */
 110     *q++ = 0; /* sec */
 111     *q++ = 0; /* frame */
 112     *q++ = 0;
 113     *q++ = 1; /* last track */
 114     *q++ = 0x00;
 115     *q++ = 0x00;
 116
 117     *q++ = 1; /* session number */
 118     *q++ = 0x14; /* data track */
 119     *q++ = 0; /* track number */
 120     *q++ = 0xa2; /* lead-out */
 121     *q++ = 0; /* min */
 122     *q++ = 0; /* sec */
 123     *q++ = 0; /* frame */
 124     if (msf) {
 125         *q++ = 0; /* reserved */
 126         lba_to_msf(q, nb_sectors);
 127         q += 3;
 128     } else {
 129         cpu_to_be32wu((uint32_t *)q, nb_sectors);
 130         q += 4;
 131     }
 132
 133     *q++ = 1; /* session number */
 134     *q++ = 0x14; /* ADR, control */
 135     *q++ = 0;    /* track number */
 136     *q++ = 1;    /* point */
 137     *q++ = 0; /* min */
 138     *q++ = 0; /* sec */
 139     *q++ = 0; /* frame */
 140     if (msf) {
 141         *q++ = 0;
 142         lba_to_msf(q, 0);
 143         q += 3;
 144     } else {
 145         *q++ = 0;
 146         *q++ = 0;
 147         *q++ = 0;
 148         *q++ = 0;
 149     }
 150
 151     len = q - buf;
 152     cpu_to_be16wu((uint16_t *)buf, len - 2);
 153     return len;
 154 }
 155
 156