Archipelago » qemu

/*

 * QEMU ATAPI CD-ROM Emulator

 *

 * Copyright (c) 2006 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

/* ??? Most of the ATAPI emulation is still in ide.c.  It should be moved

   here.  */

#include <vl.h>

static void lba_to_msf(uint8_t *buf, int lba)

{

    lba += 150;

    buf[0] = (lba / 75) / 60;

    buf[1] = (lba / 75) % 60;

    buf[2] = lba % 75;

}

/* same toc as bochs. Return -1 if error or the toc length */

/* XXX: check this */

int cdrom_read_toc(int nb_sectors, uint8_t *buf, int msf, int start_track)

{

    uint8_t *q;

    int len;

    if (start_track > 1 && start_track != 0xaa)

        return -1;

    q = buf + 2;

    *q++ = 1; /* first session */

    *q++ = 1; /* last session */

    if (start_track <= 1) {

        *q++ = 0; /* reserved */

        *q++ = 0x14; /* ADR, control */

        *q++ = 1;    /* track number */

        *q++ = 0; /* reserved */

        if (msf) {

            *q++ = 0; /* reserved */

            lba_to_msf(q, 0);

            q += 3;

        } else {

            /* sector 0 */

            cpu_to_be32wu((uint32_t *)q, 0);

            q += 4;

        }

    }

    /* lead out track */

    *q++ = 0; /* reserved */

    *q++ = 0x16; /* ADR, control */

    *q++ = 0xaa; /* track number */

    *q++ = 0; /* reserved */

    if (msf) {

        *q++ = 0; /* reserved */

        lba_to_msf(q, nb_sectors);

        q += 3;

    } else {

        cpu_to_be32wu((uint32_t *)q, nb_sectors);

        q += 4;

    }

    len = q - buf;

    cpu_to_be16wu((uint16_t *)buf, len - 2);

    return len;

}

/* mostly same info as PearPc */

int cdrom_read_toc_raw(int nb_sectors, uint8_t *buf, int msf, int session_num)

{

    uint8_t *q;

    int len;

    q = buf + 2;

    *q++ = 1; /* first session */

    *q++ = 1; /* last session */

    *q++ = 1; /* session number */

    *q++ = 0x14; /* data track */

    *q++ = 0; /* track number */

    *q++ = 0xa0; /* lead-in */

    *q++ = 0; /* min */

    *q++ = 0; /* sec */

    *q++ = 0; /* frame */

    *q++ = 0;

    *q++ = 1; /* first track */

    *q++ = 0x00; /* disk type */

    *q++ = 0x00;

    *q++ = 1; /* session number */

    *q++ = 0x14; /* data track */

    *q++ = 0; /* track number */

    *q++ = 0xa1;

    *q++ = 0; /* min */

    *q++ = 0; /* sec */

    *q++ = 0; /* frame */

    *q++ = 0;

    *q++ = 1; /* last track */

    *q++ = 0x00;

    *q++ = 0x00;

    *q++ = 1; /* session number */

    *q++ = 0x14; /* data track */

    *q++ = 0; /* track number */

    *q++ = 0xa2; /* lead-out */

    *q++ = 0; /* min */

    *q++ = 0; /* sec */

    *q++ = 0; /* frame */

    if (msf) {

        *q++ = 0; /* reserved */

        lba_to_msf(q, nb_sectors);

        q += 3;

    } else {

        cpu_to_be32wu((uint32_t *)q, nb_sectors);

        q += 4;

    }

    *q++ = 1; /* session number */

    *q++ = 0x14; /* ADR, control */

    *q++ = 0;    /* track number */

    *q++ = 1;    /* point */

    *q++ = 0; /* min */

    *q++ = 0; /* sec */

    *q++ = 0; /* frame */

    if (msf) {

        *q++ = 0;

        lba_to_msf(q, 0);

        q += 3;

    } else {

        *q++ = 0;

        *q++ = 0;

        *q++ = 0;

        *q++ = 0;

    }

    len = q - buf;

    cpu_to_be16wu((uint16_t *)buf, len - 2);

    return len;

}