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      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 
     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             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 */
     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         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