Archipelago » qemu

/*

 * QEMU ATAPI Emulation

 *

 * Copyright (c) 2003 Fabrice Bellard

 * Copyright (c) 2006 Openedhand Ltd.

 *

 * 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.

 */

#include "hw/ide/internal.h"

#include "hw/scsi/scsi.h"

static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret);

static void padstr8(uint8_t *buf, int buf_size, const char *src)

{

    int i;

    for(i = 0; i < buf_size; i++) {

        if (*src)

            buf[i] = *src++;

        else

            buf[i] = ' ';

    }

}

static inline void cpu_to_ube16(uint8_t *buf, int val)

{

    buf[0] = val >> 8;

    buf[1] = val & 0xff;

}

static inline void cpu_to_ube32(uint8_t *buf, unsigned int val)

{

    buf[0] = val >> 24;

    buf[1] = val >> 16;

    buf[2] = val >> 8;

    buf[3] = val & 0xff;

}

static inline int ube16_to_cpu(const uint8_t *buf)

{

    return (buf[0] << 8) | buf[1];

}

static inline int ube32_to_cpu(const uint8_t *buf)

{

    return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];

}

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;

}

static inline int media_present(IDEState *s)

{

    return !s->tray_open && s->nb_sectors > 0;

}

/* XXX: DVDs that could fit on a CD will be reported as a CD */

static inline int media_is_dvd(IDEState *s)

{

    return (media_present(s) && s->nb_sectors > CD_MAX_SECTORS);

}

static inline int media_is_cd(IDEState *s)

{

    return (media_present(s) && s->nb_sectors <= CD_MAX_SECTORS);

}

static void cd_data_to_raw(uint8_t *buf, int lba)

{

    /* sync bytes */

    buf[0] = 0x00;

    memset(buf + 1, 0xff, 10);

    buf[11] = 0x00;

    buf += 12;

    /* MSF */

    lba_to_msf(buf, lba);

    buf[3] = 0x01; /* mode 1 data */

    buf += 4;

    /* data */

    buf += 2048;

    /* XXX: ECC not computed */

    memset(buf, 0, 288);

}

static int cd_read_sector(IDEState *s, int lba, uint8_t *buf, int sector_size)

{

    int ret;

    switch(sector_size) {

    case 2048:

        bdrv_acct_start(s->bs, &s->acct, 4 * BDRV_SECTOR_SIZE, BDRV_ACCT_READ);

        ret = bdrv_read(s->bs, (int64_t)lba << 2, buf, 4);

        bdrv_acct_done(s->bs, &s->acct);

        break;

    case 2352:

        bdrv_acct_start(s->bs, &s->acct, 4 * BDRV_SECTOR_SIZE, BDRV_ACCT_READ);

        ret = bdrv_read(s->bs, (int64_t)lba << 2, buf + 16, 4);

        bdrv_acct_done(s->bs, &s->acct);

        if (ret < 0)

            return ret;

        cd_data_to_raw(buf, lba);

        break;

    default:

        ret = -EIO;

        break;

    }

    return ret;

}

void ide_atapi_cmd_ok(IDEState *s)

{

    s->error = 0;

    s->status = READY_STAT | SEEK_STAT;

    s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;

    ide_set_irq(s->bus);

}

void ide_atapi_cmd_error(IDEState *s, int sense_key, int asc)

{

#ifdef DEBUG_IDE_ATAPI

    printf("atapi_cmd_error: sense=0x%x asc=0x%x\n", sense_key, asc);

#endif

    s->error = sense_key << 4;

    s->status = READY_STAT | ERR_STAT;

    s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;

    s->sense_key = sense_key;

    s->asc = asc;

    ide_set_irq(s->bus);

}

void ide_atapi_io_error(IDEState *s, int ret)

{

    /* XXX: handle more errors */

    if (ret == -ENOMEDIUM) {

        ide_atapi_cmd_error(s, NOT_READY,

                            ASC_MEDIUM_NOT_PRESENT);

    } else {

        ide_atapi_cmd_error(s, ILLEGAL_REQUEST,

                            ASC_LOGICAL_BLOCK_OOR);

    }

}

/* The whole ATAPI transfer logic is handled in this function */

void ide_atapi_cmd_reply_end(IDEState *s)

{

    int byte_count_limit, size, ret;

#ifdef DEBUG_IDE_ATAPI

    printf("reply: tx_size=%d elem_tx_size=%d index=%d\n",

           s->packet_transfer_size,

           s->elementary_transfer_size,

           s->io_buffer_index);

#endif

    if (s->packet_transfer_size <= 0) {

        /* end of transfer */

        ide_transfer_stop(s);

        s->status = READY_STAT | SEEK_STAT;

        s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;

        ide_set_irq(s->bus);

#ifdef DEBUG_IDE_ATAPI

        printf("status=0x%x\n", s->status);

#endif

    } else {

        /* see if a new sector must be read */

        if (s->lba != -1 && s->io_buffer_index >= s->cd_sector_size) {

            ret = cd_read_sector(s, s->lba, s->io_buffer, s->cd_sector_size);

            if (ret < 0) {

                ide_transfer_stop(s);

                ide_atapi_io_error(s, ret);

                return;

            }

            s->lba++;

            s->io_buffer_index = 0;

        }

        if (s->elementary_transfer_size > 0) {

            /* there are some data left to transmit in this elementary

               transfer */

            size = s->cd_sector_size - s->io_buffer_index;

            if (size > s->elementary_transfer_size)

                size = s->elementary_transfer_size;

            s->packet_transfer_size -= size;

            s->elementary_transfer_size -= size;

            s->io_buffer_index += size;

            ide_transfer_start(s, s->io_buffer + s->io_buffer_index - size,

                               size, ide_atapi_cmd_reply_end);

        } else {

            /* a new transfer is needed */

            s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO;

            byte_count_limit = s->lcyl | (s->hcyl << 8);

#ifdef DEBUG_IDE_ATAPI

            printf("byte_count_limit=%d\n", byte_count_limit);

#endif

            if (byte_count_limit == 0xffff)

                byte_count_limit--;

            size = s->packet_transfer_size;

            if (size > byte_count_limit) {

                /* byte count limit must be even if this case */

                if (byte_count_limit & 1)

                    byte_count_limit--;

                size = byte_count_limit;

            }

            s->lcyl = size;

            s->hcyl = size >> 8;

            s->elementary_transfer_size = size;

            /* we cannot transmit more than one sector at a time */

            if (s->lba != -1) {

                if (size > (s->cd_sector_size - s->io_buffer_index))

                    size = (s->cd_sector_size - s->io_buffer_index);

            }

            s->packet_transfer_size -= size;

            s->elementary_transfer_size -= size;

            s->io_buffer_index += size;

            ide_transfer_start(s, s->io_buffer + s->io_buffer_index - size,

                               size, ide_atapi_cmd_reply_end);

            ide_set_irq(s->bus);

#ifdef DEBUG_IDE_ATAPI

            printf("status=0x%x\n", s->status);

#endif

        }

    }

}

/* send a reply of 'size' bytes in s->io_buffer to an ATAPI command */

static void ide_atapi_cmd_reply(IDEState *s, int size, int max_size)

{

    if (size > max_size)

        size = max_size;

    s->lba = -1; /* no sector read */

    s->packet_transfer_size = size;

    s->io_buffer_size = size;    /* dma: send the reply data as one chunk */

    s->elementary_transfer_size = 0;

    s->io_buffer_index = 0;

    if (s->atapi_dma) {

        bdrv_acct_start(s->bs, &s->acct, size, BDRV_ACCT_READ);

        s->status = READY_STAT | SEEK_STAT | DRQ_STAT;

        s->bus->dma->ops->start_dma(s->bus->dma, s,

                                   ide_atapi_cmd_read_dma_cb);

    } else {

        s->status = READY_STAT | SEEK_STAT;

        ide_atapi_cmd_reply_end(s);

    }

}

/* start a CD-CDROM read command */

static void ide_atapi_cmd_read_pio(IDEState *s, int lba, int nb_sectors,

                                   int sector_size)

{

    s->lba = lba;

    s->packet_transfer_size = nb_sectors * sector_size;

    s->elementary_transfer_size = 0;

    s->io_buffer_index = sector_size;

    s->cd_sector_size = sector_size;

    s->status = READY_STAT | SEEK_STAT;

    ide_atapi_cmd_reply_end(s);

}

static void ide_atapi_cmd_check_status(IDEState *s)

{

#ifdef DEBUG_IDE_ATAPI

    printf("atapi_cmd_check_status\n");

#endif

    s->error = MC_ERR | (UNIT_ATTENTION << 4);

    s->status = ERR_STAT;

    s->nsector = 0;

    ide_set_irq(s->bus);

}

/* ATAPI DMA support */

/* XXX: handle read errors */

static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)

{

    IDEState *s = opaque;

    int data_offset, n;

    if (ret < 0) {

        ide_atapi_io_error(s, ret);

        goto eot;

    }

    if (s->io_buffer_size > 0) {

        /*

         * For a cdrom read sector command (s->lba != -1),

         * adjust the lba for the next s->io_buffer_size chunk

         * and dma the current chunk.

         * For a command != read (s->lba == -1), just transfer

         * the reply data.

         */

        if (s->lba != -1) {

            if (s->cd_sector_size == 2352) {

                n = 1;

                cd_data_to_raw(s->io_buffer, s->lba);

            } else {

                n = s->io_buffer_size >> 11;

            }

            s->lba += n;

        }

        s->packet_transfer_size -= s->io_buffer_size;

        if (s->bus->dma->ops->rw_buf(s->bus->dma, 1) == 0)

            goto eot;

    }

    if (s->packet_transfer_size <= 0) {

        s->status = READY_STAT | SEEK_STAT;

        s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;

        ide_set_irq(s->bus);

        goto eot;

    }

    s->io_buffer_index = 0;

    if (s->cd_sector_size == 2352) {

        n = 1;

        s->io_buffer_size = s->cd_sector_size;

        data_offset = 16;

    } else {

        n = s->packet_transfer_size >> 11;

        if (n > (IDE_DMA_BUF_SECTORS / 4))

            n = (IDE_DMA_BUF_SECTORS / 4);

        s->io_buffer_size = n * 2048;

        data_offset = 0;

    }

#ifdef DEBUG_AIO

    printf("aio_read_cd: lba=%u n=%d\n", s->lba, n);

#endif

    s->bus->dma->iov.iov_base = (void *)(s->io_buffer + data_offset);

    s->bus->dma->iov.iov_len = n * 4 * 512;

    qemu_iovec_init_external(&s->bus->dma->qiov, &s->bus->dma->iov, 1);

    s->bus->dma->aiocb = bdrv_aio_readv(s->bs, (int64_t)s->lba << 2,

                                       &s->bus->dma->qiov, n * 4,

                                       ide_atapi_cmd_read_dma_cb, s);

    return;

eot:

    bdrv_acct_done(s->bs, &s->acct);

    s->bus->dma->ops->add_status(s->bus->dma, BM_STATUS_INT);

    ide_set_inactive(s);

}

/* start a CD-CDROM read command with DMA */

/* XXX: test if DMA is available */

static void ide_atapi_cmd_read_dma(IDEState *s, int lba, int nb_sectors,

                                   int sector_size)

{

    s->lba = lba;

    s->packet_transfer_size = nb_sectors * sector_size;

    s->io_buffer_index = 0;

    s->io_buffer_size = 0;

    s->cd_sector_size = sector_size;

    bdrv_acct_start(s->bs, &s->acct, s->packet_transfer_size, BDRV_ACCT_READ);

    /* XXX: check if BUSY_STAT should be set */

    s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT;

    s->bus->dma->ops->start_dma(s->bus->dma, s,

                               ide_atapi_cmd_read_dma_cb);

}

static void ide_atapi_cmd_read(IDEState *s, int lba, int nb_sectors,

                               int sector_size)

{

#ifdef DEBUG_IDE_ATAPI

    printf("read %s: LBA=%d nb_sectors=%d\n", s->atapi_dma ? "dma" : "pio",

        lba, nb_sectors);

#endif

    if (s->atapi_dma) {

        ide_atapi_cmd_read_dma(s, lba, nb_sectors, sector_size);

    } else {

        ide_atapi_cmd_read_pio(s, lba, nb_sectors, sector_size);

    }

}

static inline uint8_t ide_atapi_set_profile(uint8_t *buf, uint8_t *index,

                                            uint16_t profile)

{

    uint8_t *buf_profile = buf + 12; /* start of profiles */

    buf_profile += ((*index) * 4); /* start of indexed profile */

    cpu_to_ube16 (buf_profile, profile);

    buf_profile[2] = ((buf_profile[0] == buf[6]) && (buf_profile[1] == buf[7]));

    /* each profile adds 4 bytes to the response */

    (*index)++;

    buf[11] += 4; /* Additional Length */

    return 4;

}

static int ide_dvd_read_structure(IDEState *s, int format,

                                  const uint8_t *packet, uint8_t *buf)

{

    switch (format) {

        case 0x0: /* Physical format information */

            {

                int layer = packet[6];

                uint64_t total_sectors;

                if (layer != 0)

                    return -ASC_INV_FIELD_IN_CMD_PACKET;

                total_sectors = s->nb_sectors >> 2;

                if (total_sectors == 0) {

                    return -ASC_MEDIUM_NOT_PRESENT;

                }

                buf[4] = 1;   /* DVD-ROM, part version 1 */

                buf[5] = 0xf; /* 120mm disc, minimum rate unspecified */

                buf[6] = 1;   /* one layer, read-only (per MMC-2 spec) */

                buf[7] = 0;   /* default densities */

                /* FIXME: 0x30000 per spec? */

                cpu_to_ube32(buf + 8, 0); /* start sector */

                cpu_to_ube32(buf + 12, total_sectors - 1); /* end sector */

                cpu_to_ube32(buf + 16, total_sectors - 1); /* l0 end sector */

                /* Size of buffer, not including 2 byte size field */

                cpu_to_be16wu((uint16_t *)buf, 2048 + 2);

                /* 2k data + 4 byte header */

                return (2048 + 4);

            }

        case 0x01: /* DVD copyright information */

            buf[4] = 0; /* no copyright data */

            buf[5] = 0; /* no region restrictions */

            /* Size of buffer, not including 2 byte size field */

            cpu_to_be16wu((uint16_t *)buf, 4 + 2);

            /* 4 byte header + 4 byte data */

            return (4 + 4);

        case 0x03: /* BCA information - invalid field for no BCA info */

            return -ASC_INV_FIELD_IN_CMD_PACKET;

        case 0x04: /* DVD disc manufacturing information */

            /* Size of buffer, not including 2 byte size field */

            cpu_to_be16wu((uint16_t *)buf, 2048 + 2);

            /* 2k data + 4 byte header */

            return (2048 + 4);

        case 0xff:

            /*

             * This lists all the command capabilities above.  Add new ones

             * in order and update the length and buffer return values.

             */

            buf[4] = 0x00; /* Physical format */

            buf[5] = 0x40; /* Not writable, is readable */

            cpu_to_be16wu((uint16_t *)(buf + 6), 2048 + 4);

            buf[8] = 0x01; /* Copyright info */

            buf[9] = 0x40; /* Not writable, is readable */

            cpu_to_be16wu((uint16_t *)(buf + 10), 4 + 4);

            buf[12] = 0x03; /* BCA info */

            buf[13] = 0x40; /* Not writable, is readable */

            cpu_to_be16wu((uint16_t *)(buf + 14), 188 + 4);

            buf[16] = 0x04; /* Manufacturing info */

            buf[17] = 0x40; /* Not writable, is readable */

            cpu_to_be16wu((uint16_t *)(buf + 18), 2048 + 4);

            /* Size of buffer, not including 2 byte size field */

            cpu_to_be16wu((uint16_t *)buf, 16 + 2);

            /* data written + 4 byte header */

            return (16 + 4);

        default: /* TODO: formats beyond DVD-ROM requires */

            return -ASC_INV_FIELD_IN_CMD_PACKET;

    }

}

static unsigned int event_status_media(IDEState *s,

                                       uint8_t *buf)

{

    uint8_t event_code, media_status;

    media_status = 0;

    if (s->tray_open) {

        media_status = MS_TRAY_OPEN;

    } else if (bdrv_is_inserted(s->bs)) {

        media_status = MS_MEDIA_PRESENT;

    }

    /* Event notification descriptor */

    event_code = MEC_NO_CHANGE;

    if (media_status != MS_TRAY_OPEN) {

        if (s->events.new_media) {

            event_code = MEC_NEW_MEDIA;

            s->events.new_media = false;

        } else if (s->events.eject_request) {

            event_code = MEC_EJECT_REQUESTED;

            s->events.eject_request = false;

        }

    }

    buf[4] = event_code;

    buf[5] = media_status;

    /* These fields are reserved, just clear them. */

    buf[6] = 0;

    buf[7] = 0;

    return 8; /* We wrote to 4 extra bytes from the header */

}

static void cmd_get_event_status_notification(IDEState *s,

                                              uint8_t *buf)

{

    const uint8_t *packet = buf;

    struct {

        uint8_t opcode;

        uint8_t polled;        /* lsb bit is polled; others are reserved */

        uint8_t reserved2[2];

        uint8_t class;

        uint8_t reserved3[2];

        uint16_t len;

        uint8_t control;

    } QEMU_PACKED *gesn_cdb;

    struct {

        uint16_t len;

        uint8_t notification_class;

        uint8_t supported_events;

    } QEMU_PACKED *gesn_event_header;

    unsigned int max_len, used_len;

    gesn_cdb = (void *)packet;

    gesn_event_header = (void *)buf;

    max_len = be16_to_cpu(gesn_cdb->len);

    /* It is fine by the MMC spec to not support async mode operations */

    if (!(gesn_cdb->polled & 0x01)) { /* asynchronous mode */

        /* Only polling is supported, asynchronous mode is not. */

        ide_atapi_cmd_error(s, ILLEGAL_REQUEST,

                            ASC_INV_FIELD_IN_CMD_PACKET);

        return;

    }

    /* polling mode operation */

    /*

     * These are the supported events.

     *

     * We currently only support requests of the 'media' type.

     * Notification class requests and supported event classes are bitmasks,

     * but they are build from the same values as the "notification class"

     * field.

     */

    gesn_event_header->supported_events = 1 << GESN_MEDIA;

    /*

     * We use |= below to set the class field; other bits in this byte

     * are reserved now but this is useful to do if we have to use the

     * reserved fields later.

     */

    gesn_event_header->notification_class = 0;

    /*

     * Responses to requests are to be based on request priority.  The

     * notification_class_request_type enum above specifies the

     * priority: upper elements are higher prio than lower ones.

     */

    if (gesn_cdb->class & (1 << GESN_MEDIA)) {

        gesn_event_header->notification_class |= GESN_MEDIA;

        used_len = event_status_media(s, buf);

    } else {

        gesn_event_header->notification_class = 0x80; /* No event available */

        used_len = sizeof(*gesn_event_header);

    }

    gesn_event_header->len = cpu_to_be16(used_len

                                         - sizeof(*gesn_event_header));

    ide_atapi_cmd_reply(s, used_len, max_len);

}

static void cmd_request_sense(IDEState *s, uint8_t *buf)

{

    int max_len = buf[4];

    memset(buf, 0, 18);

    buf[0] = 0x70 | (1 << 7);

    buf[2] = s->sense_key;

    buf[7] = 10;

    buf[12] = s->asc;

    if (s->sense_key == UNIT_ATTENTION) {

        s->sense_key = NO_SENSE;

    }

    ide_atapi_cmd_reply(s, 18, max_len);

}

static void cmd_inquiry(IDEState *s, uint8_t *buf)

{

    int max_len = buf[4];

    buf[0] = 0x05; /* CD-ROM */

    buf[1] = 0x80; /* removable */

    buf[2] = 0x00; /* ISO */

    buf[3] = 0x21; /* ATAPI-2 (XXX: put ATAPI-4 ?) */

    buf[4] = 31; /* additional length */

    buf[5] = 0; /* reserved */

    buf[6] = 0; /* reserved */

    buf[7] = 0; /* reserved */

    padstr8(buf + 8, 8, "QEMU");

    padstr8(buf + 16, 16, "QEMU DVD-ROM");

    padstr8(buf + 32, 4, s->version);

    ide_atapi_cmd_reply(s, 36, max_len);

}

static void cmd_get_configuration(IDEState *s, uint8_t *buf)

{

    uint32_t len;

    uint8_t index = 0;

    int max_len;

    /* only feature 0 is supported */

    if (buf[2] != 0 || buf[3] != 0) {

        ide_atapi_cmd_error(s, ILLEGAL_REQUEST,

                            ASC_INV_FIELD_IN_CMD_PACKET);

        return;

    }

    /* XXX: could result in alignment problems in some architectures */

    max_len = ube16_to_cpu(buf + 7);

    /*

     * XXX: avoid overflow for io_buffer if max_len is bigger than

     *      the size of that buffer (dimensioned to max number of

     *      sectors to transfer at once)

     *

     *      Only a problem if the feature/profiles grow.

     */

    if (max_len > 512) {

        /* XXX: assume 1 sector */

        max_len = 512;

    }

    memset(buf, 0, max_len);

    /*

     * the number of sectors from the media tells us which profile

     * to use as current.  0 means there is no media

     */

    if (media_is_dvd(s)) {

        cpu_to_ube16(buf + 6, MMC_PROFILE_DVD_ROM);

    } else if (media_is_cd(s)) {

        cpu_to_ube16(buf + 6, MMC_PROFILE_CD_ROM);

    }

    buf[10] = 0x02 | 0x01; /* persistent and current */

    len = 12; /* headers: 8 + 4 */

    len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_DVD_ROM);

    len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_CD_ROM);

    cpu_to_ube32(buf, len - 4); /* data length */

    ide_atapi_cmd_reply(s, len, max_len);

}

static void cmd_mode_sense(IDEState *s, uint8_t *buf)

{

    int action, code;

    int max_len;

    max_len = ube16_to_cpu(buf + 7);

    action = buf[2] >> 6;

    code = buf[2] & 0x3f;

    switch(action) {

    case 0: /* current values */

        switch(code) {

        case MODE_PAGE_R_W_ERROR: /* error recovery */

            cpu_to_ube16(&buf[0], 16 - 2);

            buf[2] = 0x70;

            buf[3] = 0;

            buf[4] = 0;

            buf[5] = 0;

            buf[6] = 0;

            buf[7] = 0;

            buf[8] = MODE_PAGE_R_W_ERROR;

            buf[9] = 16 - 10;

            buf[10] = 0x00;

            buf[11] = 0x05;

            buf[12] = 0x00;

            buf[13] = 0x00;

            buf[14] = 0x00;

            buf[15] = 0x00;

            ide_atapi_cmd_reply(s, 16, max_len);

            break;

        case MODE_PAGE_AUDIO_CTL:

            cpu_to_ube16(&buf[0], 24 - 2);

            buf[2] = 0x70;

            buf[3] = 0;

            buf[4] = 0;

            buf[5] = 0;

            buf[6] = 0;

            buf[7] = 0;

            buf[8] = MODE_PAGE_AUDIO_CTL;

            buf[9] = 24 - 10;

            /* Fill with CDROM audio volume */

            buf[17] = 0;

            buf[19] = 0;

            buf[21] = 0;

            buf[23] = 0;

            ide_atapi_cmd_reply(s, 24, max_len);

            break;

        case MODE_PAGE_CAPABILITIES:

            cpu_to_ube16(&buf[0], 30 - 2);

            buf[2] = 0x70;

            buf[3] = 0;

            buf[4] = 0;

            buf[5] = 0;

            buf[6] = 0;

            buf[7] = 0;

            buf[8] = MODE_PAGE_CAPABILITIES;

            buf[9] = 30 - 10;

            buf[10] = 0x3b; /* read CDR/CDRW/DVDROM/DVDR/DVDRAM */

            buf[11] = 0x00;

            /* Claim PLAY_AUDIO capability (0x01) since some Linux

               code checks for this to automount media. */

            buf[12] = 0x71;

            buf[13] = 3 << 5;

            buf[14] = (1 << 0) | (1 << 3) | (1 << 5);

            if (s->tray_locked) {

                buf[14] |= 1 << 1;

            }

            buf[15] = 0x00; /* No volume & mute control, no changer */

            cpu_to_ube16(&buf[16], 704); /* 4x read speed */

            buf[18] = 0; /* Two volume levels */

            buf[19] = 2;

            cpu_to_ube16(&buf[20], 512); /* 512k buffer */

            cpu_to_ube16(&buf[22], 704); /* 4x read speed current */

            buf[24] = 0;

            buf[25] = 0;

            buf[26] = 0;

            buf[27] = 0;

            buf[28] = 0;

            buf[29] = 0;

            ide_atapi_cmd_reply(s, 30, max_len);

            break;

        default:

            goto error_cmd;

        }

        break;

    case 1: /* changeable values */

        goto error_cmd;

    case 2: /* default values */

        goto error_cmd;

    default:

    case 3: /* saved values */

        ide_atapi_cmd_error(s, ILLEGAL_REQUEST,

                            ASC_SAVING_PARAMETERS_NOT_SUPPORTED);

        break;

    }

    return;

error_cmd:

    ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_INV_FIELD_IN_CMD_PACKET);

}

static void cmd_test_unit_ready(IDEState *s, uint8_t *buf)

{

    /* Not Ready Conditions are already handled in ide_atapi_cmd(), so if we

     * come here, we know that it's ready. */

    ide_atapi_cmd_ok(s);

}

static void cmd_prevent_allow_medium_removal(IDEState *s, uint8_t* buf)

{

    s->tray_locked = buf[4] & 1;

    bdrv_lock_medium(s->bs, buf[4] & 1);

    ide_atapi_cmd_ok(s);

}

static void cmd_read(IDEState *s, uint8_t* buf)

{

    int nb_sectors, lba;

    if (buf[0] == GPCMD_READ_10) {

        nb_sectors = ube16_to_cpu(buf + 7);

    } else {

        nb_sectors = ube32_to_cpu(buf + 6);

    }

    lba = ube32_to_cpu(buf + 2);

    if (nb_sectors == 0) {

        ide_atapi_cmd_ok(s);

        return;

    }

    ide_atapi_cmd_read(s, lba, nb_sectors, 2048);

}

static void cmd_read_cd(IDEState *s, uint8_t* buf)

{

    int nb_sectors, lba, transfer_request;

    nb_sectors = (buf[6] << 16) | (buf[7] << 8) | buf[8];

    lba = ube32_to_cpu(buf + 2);

    if (nb_sectors == 0) {

        ide_atapi_cmd_ok(s);

        return;

    }

    transfer_request = buf[9];

    switch(transfer_request & 0xf8) {

    case 0x00:

        /* nothing */

        ide_atapi_cmd_ok(s);

        break;

    case 0x10:

        /* normal read */

        ide_atapi_cmd_read(s, lba, nb_sectors, 2048);

        break;

    case 0xf8:

        /* read all data */

        ide_atapi_cmd_read(s, lba, nb_sectors, 2352);

        break;

    default:

        ide_atapi_cmd_error(s, ILLEGAL_REQUEST,

                            ASC_INV_FIELD_IN_CMD_PACKET);

        break;

    }

}

static void cmd_seek(IDEState *s, uint8_t* buf)

{

    unsigned int lba;

    uint64_t total_sectors = s->nb_sectors >> 2;

    lba = ube32_to_cpu(buf + 2);

    if (lba >= total_sectors) {

        ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_LOGICAL_BLOCK_OOR);

        return;

    }

    ide_atapi_cmd_ok(s);

}

static void cmd_start_stop_unit(IDEState *s, uint8_t* buf)

{

    int sense;

    bool start = buf[4] & 1;