hw/block/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 "qemu/osdep.h"
  29 #include "hw/scsi/scsi.h"
  30
  31 static 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 */
  41 int 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             stl_be_p(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         stl_be_p(q, nb_sectors);
  77         q += 4;
  78     }
  79     len = q - buf;
  80     stw_be_p(buf, len - 2);
  81     return len;
  82 }
  83
  84 /* mostly same info as PearPc */
  85 int 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         stl_be_p(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     stw_be_p(buf, len - 2);
 154     return len;
 155 }