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