/*      $NetBSD: cd.c,v 1.357 2026/07/16 06:19:25 mlelstv Exp $ */

/*-
 * Copyright (c) 1998, 2001, 2003, 2004, 2005, 2008 The NetBSD Foundation,
 * Inc.  All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * MMC framework implemented and contributed to the NetBSD Foundation by
 * Reinoud Zandijk.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Originally written by Julian Elischer (julian@tfs.com)
 * for TRW Financial Systems for use under the MACH(2.5) operating system.
 *
 * TRW Financial Systems, in accordance with their agreement with Carnegie
 * Mellon University, makes this software available to CMU to distribute
 * or use in any manner that they see fit as long as this message is kept with
 * the software. For this reason TFS also grants any other persons or
 * organisations permission to use or modify this software.
 *
 * TFS supplies this software to be publicly redistributed
 * on the understanding that TFS is not responsible for the correct
 * functioning of this software in any circumstances.
 *
 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cd.c,v 1.357 2026/07/16 06:19:25 mlelstv Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/cdio.h>
#include <sys/dvdio.h>
#include <sys/scsiio.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <sys/rndsource.h>

#include <dev/scsipi/scsi_spc.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsipi_cd.h>
#include <dev/scsipi/scsipi_disk.h>     /* rw_big and start_stop come */
#include <dev/scsipi/scsi_all.h>
                                        /* from there */
#include <dev/scsipi/scsi_disk.h>       /* rw comes from there */
#include <dev/scsipi/scsipiconf.h>
#include <dev/scsipi/scsipi_base.h>
#include <dev/scsipi/cdvar.h>

#include <prop/proplib.h>

#define CDUNIT(z)                       DISKUNIT(z)
#define CDPART(z)                       DISKPART(z)
#define CDMINOR(unit, part)             DISKMINOR(unit, part)
#define MAKECDDEV(maj, unit, part)      MAKEDISKDEV(maj, unit, part)

#define MAXTRACK        99
#define CD_BLOCK_OFFSET 150
#define CD_FRAMES       75
#define CD_SECS         60

#define CD_TOC_FORM     0       /* formatted TOC, exposed to userland     */
#define CD_TOC_MSINFO   1       /* multi-session info                     */
#define CD_TOC_RAW      2       /* raw TOC as on disc, unprocessed        */
#define CD_TOC_PMA      3       /* PMA, used as intermediate (rare use)   */
#define CD_TOC_ATIP     4       /* pressed space of recordable            */
#define CD_TOC_CDTEXT   5       /* special CD-TEXT, rarely used           */

#define P5LEN   0x32
#define MS5LEN  (P5LEN + 8 + 2)

struct cd_formatted_toc {
        struct ioc_toc_header header;
        struct cd_toc_entry entries[MAXTRACK+1]; /* One extra for the */
                                                 /* leadout */
};

struct cdbounce {
        struct buf *obp;        /* original buf */
        struct buf *lbp;        /* first buffer */
        struct buf *rbp;        /* second buffer */
        int lerr;               /* error returned for first buffer */
        int rerr;               /* error returned for second buffer */
        int head;               /* bytes skipped at the start */
        int lcount;             /* bytes copied to first buffer */
        int rcount;             /* bytes copied to second buffer */
};

static void     cdstart(struct scsipi_periph *);
static void     cdrestart(void *);
static void     cdminphys(struct buf *);
static void     cddone(struct scsipi_xfer *, int);
static int      cd_interpret_sense(struct scsipi_xfer *);
static int      cd_diskstart(device_t, struct buf *);
static void     cd_iosize(device_t, int *);
static int      cd_lastclose(device_t);
static int      cd_firstopen(device_t, dev_t, int, int);
static void     cd_label(device_t, struct disklabel *);
static u_long   cd_size(struct cd_softc *, int);
static int      cd_play(struct cd_softc *, int, int);
static int      cd_play_tracks(struct cd_softc *, struct cd_formatted_toc *,
                    int, int, int, int);
static int      cd_play_msf(struct cd_softc *, int, int, int, int, int, int);
static int      cd_pause(struct cd_softc *, int);
static int      cd_reset(struct cd_softc *);
static int      cd_read_subchannel(struct cd_softc *, int, int, int,
                    struct cd_sub_channel_info *, int, int);
static int      cd_read_toc(struct cd_softc *, int, int, int,
                    struct cd_formatted_toc *, int, int, int);
static int      cd_get_parms(struct cd_softc *, int);
static int      cd_load_toc(struct cd_softc *, int, struct cd_formatted_toc *, int);
static int      cdreadmsaddr(struct cd_softc *, struct cd_formatted_toc *,int *);
static int      cdcachesync(struct scsipi_periph *periph, int flags);

static int      dvd_auth(struct cd_softc *, dvd_authinfo *);
static int      dvd_read_physical(struct cd_softc *, dvd_struct *);
static int      dvd_read_copyright(struct cd_softc *, dvd_struct *);
static int      dvd_read_disckey(struct cd_softc *, dvd_struct *);
static int      dvd_read_bca(struct cd_softc *, dvd_struct *);
static int      dvd_read_manufact(struct cd_softc *, dvd_struct *);
static int      dvd_read_struct(struct cd_softc *, dvd_struct *);

static int      cd_mode_sense(struct cd_softc *, u_int8_t, void *, size_t, int,
                    int, int *);
static int      cd_mode_select(struct cd_softc *, u_int8_t, void *, size_t,
                    int, int);
static int      cd_setchan(struct cd_softc *, int, int, int, int, int);
static int      cd_getvol(struct cd_softc *, struct ioc_vol *, int);
static int      cd_setvol(struct cd_softc *, const struct ioc_vol *, int);
static int      cd_set_pa_immed(struct cd_softc *, int);
static int      cd_load_unload(struct cd_softc *, struct ioc_load_unload *);
static int      cd_setblksize(struct cd_softc *);

static int      cdmatch(device_t, cfdata_t, void *);
static void     cdattach(device_t, device_t, void *);
static int      cddetach(device_t, int);

static int      mmc_getdiscinfo(struct scsipi_periph *, struct mmc_discinfo *);
static int      mmc_gettrackinfo(struct scsipi_periph *, struct mmc_trackinfo *);
static int      mmc_do_op(struct scsipi_periph *, struct mmc_op *);
static int      mmc_setup_writeparams(struct scsipi_periph *, struct mmc_writeparams *);

static void     cd_set_geometry(struct cd_softc *);

CFATTACH_DECL3_NEW(cd, sizeof(struct cd_softc), cdmatch, cdattach, cddetach,
    NULL, NULL, NULL, DVF_DETACH_SHUTDOWN);

extern struct cfdriver cd_cd;

static const struct scsipi_inquiry_pattern cd_patterns[] = {
        {T_CDROM, T_REMOV,
         "",         "",                 ""},
        {T_WORM, T_REMOV,
         "",         "",                 ""},
#if 0
        {T_CDROM, T_REMOV, /* more luns */
         "PIONEER ", "CD-ROM DRM-600  ", ""},
#endif
        {T_DIRECT, T_REMOV,
         "NEC                 CD-ROM DRIVE:260", "", ""},
};

static dev_type_open(cdopen);
static dev_type_close(cdclose);
static dev_type_read(cdread);
static dev_type_write(cdwrite);
static dev_type_ioctl(cdioctl);
static dev_type_strategy(cdstrategy);
static dev_type_dump(cddump);
static dev_type_size(cdsize);

const struct bdevsw cd_bdevsw = {
        .d_open = cdopen,
        .d_close = cdclose,
        .d_strategy = cdstrategy,
        .d_ioctl = cdioctl,
        .d_dump = cddump,
        .d_psize = cdsize,
        .d_discard = nodiscard,
        .d_flag = D_DISK | D_MPSAFE
};

const struct cdevsw cd_cdevsw = {
        .d_open = cdopen,
        .d_close = cdclose,
        .d_read = cdread,
        .d_write = cdwrite,
        .d_ioctl = cdioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = nopoll,
        .d_mmap = nommap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = D_DISK | D_MPSAFE
};

static const struct dkdriver cddkdriver = {
        .d_open = cdopen,
        .d_close = cdclose,
        .d_strategy = cdstrategy,
        .d_minphys = cdminphys,
        .d_diskstart = cd_diskstart,
        .d_firstopen = cd_firstopen,
        .d_lastclose = cd_lastclose,
        .d_label = cd_label,
};

static const struct scsipi_periphsw cd_switch = {
        cd_interpret_sense,     /* use our error handler first */
        cdstart,                /* we have a queue, which is started by this */
        NULL,                   /* we do not have an async handler */
        cddone,                 /* deal with stats at interrupt time */
};

/*
 * The routine called by the low level scsi routine when it discovers
 * A device suitable for this driver
 */
static int
cdmatch(device_t parent, cfdata_t match, void *aux)
{
        struct scsipibus_attach_args *sa = aux;
        int priority;

        (void)scsipi_inqmatch(&sa->sa_inqbuf,
            cd_patterns, sizeof(cd_patterns) / sizeof(cd_patterns[0]),
            sizeof(cd_patterns[0]), &priority);

        return (priority);
}

static void
cdattach(device_t parent, device_t self, void *aux)
{
        struct cd_softc *cd = device_private(self);
        struct dk_softc *dksc = &cd->sc_dksc;
        struct scsipibus_attach_args *sa = aux;
        struct scsipi_periph *periph = sa->sa_periph;
        int dtype;

        SC_DEBUG(periph, SCSIPI_DB2, ("cdattach: "));

        switch (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(sa->sa_periph))) {
        case SCSIPI_BUSTYPE_SCSI:
                dtype = DKTYPE_SCSI;
                if (periph->periph_version == 0)
                        cd->flags |= CDF_ANCIENT;
                if (periph->periph_version >= 2)
                        periph->periph_quirks |= PQUIRK_ONLYBIG;
                break; 
        case SCSIPI_BUSTYPE_ATAPI:
                dtype = DKTYPE_ATAPI;
                break;
        default:
                dtype = DKTYPE_UNKNOWN;
                break; 
        }

        /*
         * Initialize and attach the disk structure.
         */
        dk_init(dksc, self, dtype);
        disk_init(&dksc->sc_dkdev, dksc->sc_xname, &cddkdriver);

        dk_attach(dksc);
        disk_attach(&dksc->sc_dkdev);

        bufq_alloc(&dksc->sc_bufq, "disksort", BUFQ_SORT_RAWBLOCK);

        callout_init(&cd->sc_callout, 0);

        /*
         * Store information needed to contact our base driver
         */
        cd->sc_periph = periph;

        periph->periph_dev = dksc->sc_dev;
        periph->periph_switch = &cd_switch;

        /*
         * Increase our openings to the maximum-per-periph
         * supported by the adapter.  This will either be
         * clamped down or grown by the adapter if necessary.
         */
        periph->periph_openings =
            SCSIPI_CHAN_MAX_PERIPH(periph->periph_channel);
        periph->periph_flags |= PERIPH_GROW_OPENINGS;

        aprint_naive("\n");
        aprint_normal("\n");

        if (!pmf_device_register(self, NULL, NULL))
                aprint_error_dev(self, "couldn't establish power handler\n");
}

static int
cddetach(device_t self, int flags)
{
        struct cd_softc *cd = device_private(self);
        struct dk_softc *dksc = &cd->sc_dksc;
        struct scsipi_periph *periph = cd->sc_periph;
        struct scsipi_channel *chan = periph->periph_channel;
        int bmaj, cmaj, i, mn, rc;

        if ((rc = disk_begindetach(&dksc->sc_dkdev, cd_lastclose, self, flags)) != 0)
                return rc;

        /* locate the major number */
        bmaj = bdevsw_lookup_major(&cd_bdevsw);
        cmaj = cdevsw_lookup_major(&cd_cdevsw);

        /* Nuke the vnodes for any open instances */
        for (i = 0; i < MAXPARTITIONS; i++) {
                mn = CDMINOR(device_unit(self), i);
                vdevgone(bmaj, mn, mn, VBLK);
                vdevgone(cmaj, mn, mn, VCHR);
        }

        /* kill any pending restart */
        callout_halt(&cd->sc_callout, NULL);

        dk_drain(dksc);

        /* Kill off any pending commands. */
        mutex_enter(chan_mtx(chan));
        scsipi_kill_pending(cd->sc_periph);
        mutex_exit(chan_mtx(chan));

        bufq_free(dksc->sc_bufq);

        /* Detach from the disk list. */
        disk_detach(&dksc->sc_dkdev);
        disk_destroy(&dksc->sc_dkdev);

        dk_detach(dksc);

        callout_destroy(&cd->sc_callout);

        pmf_device_deregister(self);

        return (0);
}

/*
 * Serialized by caller
 */
static int
cd_firstopen(device_t self, dev_t dev, int flag, int fmt)
{
        struct cd_softc *cd = device_private(self);
        struct scsipi_periph *periph = cd->sc_periph;
        struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter;
        int error, silent;
        int part;

        part = CDPART(dev);

        error = scsipi_adapter_addref(adapt);
        if (error)
                return error;

        if ((part == RAW_PART && fmt == S_IFCHR) || (flag & FSILENT))
                silent = XS_CTL_SILENT;
        else
                silent = 0;

        /* make cdclose() silent */
        cd->flags |= CDF_EJECTED;

        /* Check that it is still responding and ok. */
        error = scsipi_test_unit_ready(periph,
            XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_MEDIA_CHANGE |
            XS_CTL_SILENT);

        /*
         * Start the pack spinning if necessary. Always allow the
         * raw partition to be opened, for raw IOCTLs. Data transfers
         * will check for SDEV_MEDIA_LOADED.
         */
        if (error == EIO) {
                error = scsipi_start(periph, SSS_START, silent);
                if (error == EINVAL)
                        error = EIO;
        }
        if (error) {
                if (part == RAW_PART)
                        goto out;
                goto bad;
        }

        /* Lock the pack in. */
        error = scsipi_prevent(periph, SPAMR_PREVENT_DT,
            XS_CTL_IGNORE_ILLEGAL_REQUEST |
            XS_CTL_IGNORE_MEDIA_CHANGE);
        SC_DEBUG(periph, SCSIPI_DB1,
            ("cdopen: scsipi_prevent, error=%d\n", error));
        if (error) {
                if (part == RAW_PART)
                        goto out;
                goto bad;
        }

        if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) {
                int param_error;

                /* Load the physical device parameters. */
                param_error = cd_get_parms(cd, 0);
                if (param_error == CDGP_RESULT_OFFLINE) {
                        error = ENXIO;
                        goto bad2;
                }
                periph->periph_flags |= PERIPH_MEDIA_LOADED;

                SC_DEBUG(periph, SCSIPI_DB3, ("Params loaded "));

                cd_set_geometry(cd);

                /* make cdclose() loud again */
                cd->flags &= ~CDF_EJECTED;
        }

        periph->periph_flags |= PERIPH_OPEN;

out:
        return 0;

bad2:
        scsipi_prevent(periph, SPAMR_ALLOW,
            XS_CTL_IGNORE_ILLEGAL_REQUEST |
            XS_CTL_IGNORE_MEDIA_CHANGE |
            XS_CTL_SILENT);

bad:
        scsipi_adapter_delref(adapt);
        return error;
}

/*
 * open the device. Make sure the partition info is a up-to-date as can be.
 */
static int
cdopen(dev_t dev, int flag, int fmt, struct lwp *l)
{
        struct cd_softc *cd;
        struct dk_softc *dksc;
        struct scsipi_periph *periph;
        int unit, part;
        int error;

        unit = CDUNIT(dev);
        cd = device_lookup_private(&cd_cd, unit);
        if (cd == NULL)
                return (ENXIO);
        dksc = &cd->sc_dksc;

        periph = cd->sc_periph;
        part = CDPART(dev);

        SC_DEBUG(periph, SCSIPI_DB1,
            ("cdopen: dev=0x%"PRIu64" (unit %"PRIu32" (of %d), partition %d)\n",
            dev, unit, cd_cd.cd_ndevs, CDPART(dev)));

        /*
         * If any partition is open, but the disk has been invalidated,
         * disallow further opens of non-raw partition
         */
        if ((periph->periph_flags & (PERIPH_OPEN | PERIPH_MEDIA_LOADED)) ==
            PERIPH_OPEN) {
                if (part != RAW_PART || fmt != S_IFCHR)
                        return EIO;
        }

        error = dk_open(dksc, dev, flag, fmt, l);

        SC_DEBUG(periph, SCSIPI_DB3, ("open complete\n"));

        return error;
}

/*      
 * Serialized by caller
 */     
static int
cd_lastclose(device_t self)
{ 
        struct cd_softc *cd = device_private(self);
        struct scsipi_periph *periph = cd->sc_periph;
        struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter;
        int silent;

        if ((cd->flags & CDF_EJECTED) != 0 ||
            (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)
                silent = XS_CTL_SILENT;
        else
                silent = 0;

        cdcachesync(periph, silent);

        scsipi_wait_drain(periph);  

        scsipi_prevent(periph, SPAMR_ALLOW,
            XS_CTL_IGNORE_ILLEGAL_REQUEST |
            XS_CTL_IGNORE_NOT_READY |
            XS_CTL_SILENT);
        periph->periph_flags &= ~PERIPH_OPEN;

        scsipi_wait_drain(periph);

        scsipi_adapter_delref(adapt); 

        return 0;
}

/*
 * close the device.. only called if we are the LAST
 * occurrence of an open device
 */
static int
cdclose(dev_t dev, int flag, int fmt, struct lwp *l)
{
        struct cd_softc *cd;
        struct dk_softc *dksc;
        int unit;

        unit = CDUNIT(dev);
        cd = device_lookup_private(&cd_cd, unit);
        dksc = &cd->sc_dksc;

        return dk_close(dksc, dev, flag, fmt, l);
}

static void
cd_bounce_buffer_done(struct buf *bp)
{
        struct cdbounce *bounce = bp->b_private;
        struct buf *obp = bounce->obp;

        if (bp == bounce->lbp) {
                if ((bounce->lerr = bp->b_error) == 0)
                        memcpy(obp->b_data, (char *)bp->b_data + bounce->head, bounce->lcount);
                bounce->lbp = NULL;
        }

        if (bp == bounce->rbp) {
                if ((bounce->rerr = bp->b_error) == 0)
                        memcpy((char *)obp->b_data + bounce->lcount, bp->b_data, bounce->rcount);
                bounce->rbp = NULL;
        }

        free(bp->b_data, M_DEVBUF);
        putiobuf(bp);

        if (bounce->lbp != NULL || bounce->rbp != NULL)
                return;

        obp->b_error = bounce->rerr;
        if (bounce->lerr)
                obp->b_error = bounce->lerr;

        obp->b_resid = 0;
        if (obp->b_error)
                obp->b_resid = obp->b_bcount;

        free(bounce, M_DEVBUF);
        biodone(obp);
}

static int
cd_make_bounce_buffer(struct cd_softc *cd, struct buf *bp, daddr_t blkno, int count, struct buf **nbpp, void *priv)
{
        struct buf *nbp;

        /* We don't support bouncing writes */
        if ((bp->b_flags & B_READ) == 0)
                return EACCES; /* XXX */

        nbp = getiobuf(NULL, false);
        if (nbp == NULL)
                return ENOMEM;

        nbp->b_data = malloc(count, M_DEVBUF, M_NOWAIT);
        if (nbp->b_data == NULL) {
                putiobuf(nbp);
                return ENOMEM;
        }

        /* Set up the IOP to the bounce buffer */
        nbp->b_error = 0;
        nbp->b_dev = bp->b_dev;
        nbp->b_proc = bp->b_proc;
        nbp->b_bcount = count;
        nbp->b_bufsize = count;
        nbp->b_blkno = blkno;
        nbp->b_flags = bp->b_flags | B_READ;
        nbp->b_oflags = bp->b_oflags;
        nbp->b_cflags = bp->b_cflags;
        nbp->b_iodone = cd_bounce_buffer_done;
        nbp->b_private = priv;

        BIO_COPYPRIO(nbp, bp);

        *nbpp = nbp;
        return 0;
}

static int
cd_make_bounce(struct cd_softc *cd, struct buf *bp, struct cdbounce **bouncep)
{
        struct dk_softc *dksc = &cd->sc_dksc;
        unsigned secsize = dksc->sc_dkdev.dk_geom.dg_secsize;
        struct cdbounce *bounce;
        int bps, nblks, skip, total, count;
        daddr_t blkno;
        struct buf *lbp, *rbp;
        int error;

        bounce = malloc(sizeof(struct cdbounce), M_DEVBUF, M_NOWAIT|M_ZERO);
        if (bounce == NULL)
                return ENOMEM;

        bps = howmany(secsize, DEV_BSIZE);
        nblks = howmany(bp->b_bcount, DEV_BSIZE);

        skip = bp->b_blkno % bps;

        blkno = bp->b_blkno - skip;
        total = roundup(nblks + skip, bps) * DEV_BSIZE;

        count = total;
        cd_iosize(dksc->sc_dev, &count);

        bounce->head = skip * DEV_BSIZE;
        bounce->lcount = imin(count - bounce->head, bp->b_bcount);
        bounce->rcount = bp->b_bcount - bounce->lcount;

        error = cd_make_bounce_buffer(cd, bp, blkno, count, &lbp, bounce);
        if (error)
                goto bad;

        blkno += howmany(count, DEV_BSIZE);
        count = total - count;

        if (count > 0) {
                error = cd_make_bounce_buffer(cd, bp, blkno, count, &rbp, bounce);
                if (error) {
                        free(lbp->b_data, M_DEVBUF);
                        putiobuf(lbp);
                        goto bad;
                }
        } else
                rbp = NULL;

        bounce->obp = bp;
        bounce->lbp = lbp;
        bounce->rbp = rbp;

        *bouncep = bounce;

        return 0;

bad:
        free(bounce, M_DEVBUF);
        return error;
}

/*
 * Actually translate the requested transfer into one the physical driver can
 * understand.  The transfer is described by a buf and will include only one
 * physical transfer.
 */
static void
cdstrategy(struct buf *bp)
{
        struct cd_softc *cd = device_lookup_private(&cd_cd,CDUNIT(bp->b_dev));
        struct dk_softc *dksc = &cd->sc_dksc;
        struct scsipi_periph *periph = cd->sc_periph;
        int error;

        SC_DEBUG(cd->sc_periph, SCSIPI_DB2, ("cdstrategy "));
        SC_DEBUG(cd->sc_periph, SCSIPI_DB1,
            ("%d bytes @ blk %" PRId64 "\n", bp->b_bcount, bp->b_blkno));

        /*
         * If the device has been made invalid, error out
         * maybe the media changed
         */
        if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) {
                if (periph->periph_flags & PERIPH_OPEN)
                        error = EIO;
                else
                        error = ENODEV;
                goto bad;
        }

        /*
         * If label and device don't agree in sector size use a bounce buffer
         */
        if (dksc->sc_dkdev.dk_label->d_secsize != dksc->sc_dkdev.dk_geom.dg_secsize) {
                struct cdbounce *bounce = NULL;

                error = cd_make_bounce(cd, bp, &bounce);
                if (error)
                        goto bad;

                dk_strategy(dksc, bounce->lbp);
                if (bounce->rbp != NULL)
                        dk_strategy(dksc, bounce->rbp);

                return;
        }
        
        dk_strategy(dksc, bp);
        return;

bad:
        bp->b_error = error;
        bp->b_resid = bp->b_bcount;
        biodone(bp);
}

/*
 * Issue single I/O command
 *
 * Called from dk_start and implicitly from dk_strategy
 */
static int
cd_diskstart(device_t dev, struct buf *bp)
{
        struct cd_softc *cd = device_private(dev);
        struct scsipi_periph *periph = cd->sc_periph;
        struct scsipi_channel *chan = periph->periph_channel;
        struct scsipi_rw_10 cmd_big;
        struct scsi_rw_6 cmd_small;
        struct scsipi_generic *cmdp;
        struct scsipi_xfer *xs;
        int error, flags, nblks, cmdlen;

        SC_DEBUG(periph, SCSIPI_DB2, ("cdstart "));

        mutex_enter(chan_mtx(chan));

        if (periph->periph_active >= periph->periph_openings) {
                error = EAGAIN;
                goto out;
        }

        /*
         * there is excess capacity, but a special waits
         * It'll need the adapter as soon as we clear out of the
         * way and let it run (user level wait).
         */
        if (periph->periph_flags & PERIPH_WAITING) {
                periph->periph_flags &= ~PERIPH_WAITING;
                cv_broadcast(periph_cv_periph(periph));
                error = EAGAIN;
                goto out;
        }

        /*
         * If the device has become invalid, abort all the
         * reads and writes until all files have been closed and
         * re-opened
         */
        if (__predict_false(
            (periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)) {
                error = EIO;
                goto out;
        }

        nblks = howmany(bp->b_bcount, cd->params.blksize);

        /*
         *  Fill out the scsi command.  If the transfer will
         *  fit in a "small" cdb, use it.
         */
        if (((bp->b_rawblkno & 0x1fffff) == bp->b_rawblkno) &&
            ((nblks & 0xff) == nblks) &&
            !(periph->periph_quirks & PQUIRK_ONLYBIG)) {
                /*
                 * We can fit in a small cdb.
                 */
                memset(&cmd_small, 0, sizeof(cmd_small));
                cmd_small.opcode = (bp->b_flags & B_READ) ?
                    SCSI_READ_6_COMMAND : SCSI_WRITE_6_COMMAND;
                _lto3b(bp->b_rawblkno, cmd_small.addr);
                cmd_small.length = nblks & 0xff;
                cmdlen = sizeof(cmd_small);
                cmdp = (struct scsipi_generic *)&cmd_small;
        } else {
                /*
                 * Need a large cdb.
                 */
                memset(&cmd_big, 0, sizeof(cmd_big));
                cmd_big.opcode = (bp->b_flags & B_READ) ?
                    READ_10 : WRITE_10;
                _lto4b(bp->b_rawblkno, cmd_big.addr);
                _lto2b(nblks, cmd_big.length);
                cmdlen = sizeof(cmd_big);
                cmdp = (struct scsipi_generic *)&cmd_big;
        }

        /*
         * Figure out what flags to use.
         */
        flags = XS_CTL_NOSLEEP|XS_CTL_ASYNC|XS_CTL_SIMPLE_TAG;
        if (bp->b_flags & B_READ)
                flags |= XS_CTL_DATA_IN;
        else
                flags |= XS_CTL_DATA_OUT;

        /*
         * Call the routine that chats with the adapter.
         * Note: we cannot sleep as we may be an interrupt
         */
        xs = scsipi_make_xs_locked(periph, cmdp, cmdlen,
            (u_char *)bp->b_data, bp->b_bcount,
            CDRETRIES, 30000, bp, flags);
        if (__predict_false(xs == NULL)) {
                /*
                 * out of memory. Keep this buffer in the queue, and
                 * retry later.
                 */
                callout_reset(&cd->sc_callout, hz / 2, cdrestart, cd);
                error = EAGAIN;
                goto out;
        }

        error = scsipi_execute_xs(xs);
        /* with a scsipi_xfer preallocated, scsipi_command can't fail */
        KASSERT(error == 0);

out:
        mutex_exit(chan_mtx(chan));

        return error;
}

/*
 * Recover I/O request after memory shortage
 *
 * Called from callout
 */
static void
cdrestart(void *v)
{
        struct cd_softc *cd = v;
        struct dk_softc *dksc = &cd->sc_dksc;

        dk_start(dksc, NULL);
}

/*
 * Recover I/O request after memory shortage
 *
 * Called from scsipi midlayer when resources have been freed
 * with channel lock held
 */
static void
cdstart(struct scsipi_periph *periph)
{
        struct cd_softc *cd = device_private(periph->periph_dev);
        struct dk_softc *dksc = &cd->sc_dksc;
        struct scsipi_channel *chan = periph->periph_channel;

        /*
         * release channel lock as dk_start may need to acquire
         * other locks
         *
         * cdstart is called from scsipi_put_xs and all its callers
         * release the lock afterwards. So releasing it here
         * doesn't matter.
         */
        mutex_exit(chan_mtx(chan));

        dk_start(dksc, NULL);

        mutex_enter(chan_mtx(chan));
}

static void
cddone(struct scsipi_xfer *xs, int error)
{
        struct cd_softc *cd = device_private(xs->xs_periph->periph_dev);
        struct dk_softc *dksc = &cd->sc_dksc;
        struct buf *bp = xs->bp;

        if (bp) {
                bp->b_error = error;
                bp->b_resid = xs->resid;
                if (error) {
                        /* on a read/write error bp->b_resid is zero, so fix */
                        bp->b_resid = bp->b_bcount;
                }

                dk_done(dksc, bp);
                /* dk_start is called from scsipi_complete */
        }
}

static int
cd_interpret_sense(struct scsipi_xfer *xs)
{
        struct scsipi_periph *periph = xs->xs_periph;
        struct scsi_sense_data *sense = &xs->sense.scsi_sense;
        int retval = EJUSTRETURN;

        /*
         * If it isn't an extended or extended/deferred error, let
         * the generic code handle it.
         */
        if (SSD_RCODE(sense->response_code) != SSD_RCODE_CURRENT &&
            SSD_RCODE(sense->response_code) != SSD_RCODE_DEFERRED)
                return (retval);

        /*
         * If we got a "Unit not ready" (SKEY_NOT_READY) and "Logical Unit
         * Is In The Process of Becoming Ready" (Sense code 0x04,0x01), then
         * wait a bit for the drive to spin up
         */

        if ((SSD_SENSE_KEY(sense->flags) == SKEY_NOT_READY) &&
            (sense->asc == 0x04) && (sense->ascq == 0x01)) {
                /*
                 * Sleep for 5 seconds to wait for the drive to spin up
                 */

                SC_DEBUG(periph, SCSIPI_DB1, ("Waiting 5 sec for CD "
                                                "spinup\n"));
                if (!callout_pending(&periph->periph_callout))
                        scsipi_periph_freeze(periph, 1);
                callout_reset(&periph->periph_callout,
                    5 * hz, scsipi_periph_timed_thaw, periph);
                retval = ERESTART;
        }

        /*
         * If we got a "Unit not ready" (SKEY_NOT_READY) and "Logical Unit Not
         * Ready, Operation In Progress" (Sense code 0x04, 0x07),
         * then wait for the specified time
         */
         
        if ((SSD_SENSE_KEY(sense->flags) == SKEY_NOT_READY) &&
            (sense->asc == 0x04) && (sense->ascq == 0x07)) {
                /*
                 * we could listen to the delay; but it looks like the skey
                 * data is not always returned.
                 */
                /* cd_delay = _2btol(sense->sks.sks_bytes); */

                /* wait for a half second and get going again */
                if (!callout_pending(&periph->periph_callout))
                        scsipi_periph_freeze(periph, 1);
                callout_reset(&periph->periph_callout,
                    hz/2, scsipi_periph_timed_thaw, periph);
                retval = ERESTART;
        }

        /*
         * If we got a "Unit not ready" (SKEY_NOT_READY) and "Long write in
         * progress" (Sense code 0x04, 0x08), then wait for the specified
         * time
         */
         
        if ((SSD_SENSE_KEY(sense->flags) == SKEY_NOT_READY) &&
            (sense->asc == 0x04) && (sense->ascq == 0x08)) {
                /*
                 * long write in process; we could listen to the delay; but it
                 * looks like the skey data is not always returned.
                 */
                /* cd_delay = _2btol(sense->sks.sks_bytes); */

                /* wait for a half second and get going again */
                if (!callout_pending(&periph->periph_callout))
                        scsipi_periph_freeze(periph, 1);
                callout_reset(&periph->periph_callout,
                    hz/2, scsipi_periph_timed_thaw, periph);
                retval = ERESTART;
        }

        return (retval);
}

static void
cdminphys(struct buf *bp)
{
        struct cd_softc *cd = device_lookup_private(&cd_cd, CDUNIT(bp->b_dev));
        struct dk_softc *dksc = &cd->sc_dksc;
        long xmax;

        /*
         * If the device is ancient, we want to make sure that
         * the transfer fits into a 6-byte cdb.
         *
         * XXX Note that the SCSI-I spec says that 256-block transfers
         * are allowed in a 6-byte read/write, and are specified
         * by setting the "length" to 0.  However, we're conservative
         * here, allowing only 255-block transfers in case an
         * ancient device gets confused by length == 0.  A length of 0
         * in a 10-byte read/write actually means 0 blocks.
         */
        if (cd->flags & CDF_ANCIENT) {
                xmax = dksc->sc_dkdev.dk_geom.dg_secsize * 0xff;

                if (bp->b_bcount > xmax)
                        bp->b_bcount = xmax;
        }

        scsipi_adapter_minphys(cd->sc_periph->periph_channel, bp);
}

static void
cd_iosize(device_t dev, int *count)
{
        struct buf B;
        int bmaj;

        bmaj       = bdevsw_lookup_major(&cd_bdevsw);
        B.b_dev    = MAKECDDEV(bmaj,device_unit(dev),RAW_PART);
        B.b_bcount = *count;

        cdminphys(&B);

        *count = B.b_bcount;
}

static int
cdread(dev_t dev, struct uio *uio, int ioflag)
{
        return (physio(cdstrategy, NULL, dev, B_READ, cdminphys, uio));
}

static int
cdwrite(dev_t dev, struct uio *uio, int ioflag)
{
        return (physio(cdstrategy, NULL, dev, B_WRITE, cdminphys, uio));
}

#if 0   /* XXX Not used */
/*
 * conversion between minute-seconde-frame and logical block address
 * addresses format
 */
static void
lba2msf(u_long lba, u_char *m, u_char *s, u_char *f)
{
        u_long tmp;

        tmp = lba + CD_BLOCK_OFFSET;    /* offset of first logical frame */
        tmp &= 0xffffff;                /* negative lbas use only 24 bits */
        *m = tmp / (CD_SECS * CD_FRAMES);
        tmp %= (CD_SECS * CD_FRAMES);
        *s = tmp / CD_FRAMES;
        *f = tmp % CD_FRAMES;
}
#endif /* XXX Not used */

/*
 * Convert an hour:minute:second:frame address to a logical block address. In
 * theory the number of secs/minute and number of frames/second could be
 * configured differently in the device  as could the block offset but in
 * practice these values are rock solid and most drives don't even allow
 * theses values to be changed.
 */
static uint32_t
hmsf2lba(uint8_t h, uint8_t m, uint8_t s, uint8_t f)
{
        return (((((uint32_t) h * 60 + m) * CD_SECS) + s) * CD_FRAMES + f)
                - CD_BLOCK_OFFSET;
}

static int
cdreadmsaddr(struct cd_softc *cd, struct cd_formatted_toc *toc, int *addr)
{
        struct scsipi_periph *periph = cd->sc_periph;
        int error;
        struct cd_toc_entry *cte;

        error = cd_read_toc(cd, CD_TOC_FORM, 0, 0, toc,
            sizeof(struct ioc_toc_header) + sizeof(struct cd_toc_entry),
            0, 0x40 /* control word for "get MS info" */);

        if (error)
                return (error);

        cte = &toc->entries[0];
        if (periph->periph_quirks & PQUIRK_LITTLETOC) {
                cte->addr.lba = le32toh(cte->addr.lba);
                toc->header.len = le16toh(toc->header.len);
        } else {
                cte->addr.lba = be32toh(cte->addr.lba);
                toc->header.len = be16toh(toc->header.len);
        }

        *addr = (toc->header.len >= 10 && cte->track > 1) ?
                cte->addr.lba : 0;
        return 0;
}

/* synchronise caches code from cd.c, move to scsipi_ioctl.c ? */
static int
cdcachesync(struct scsipi_periph *periph, int flags) {
        struct scsi_synchronize_cache_10 cmd;

        /*
         * Issue a SYNCHRONIZE CACHE. MMC devices have to issue with address 0
         * and length 0 as it can't synchronise parts of the disc per spec.
         * We ignore ILLEGAL REQUEST in the event that the command is not
         * supported by the device, and poll for completion so that we know
         * that the cache has actually been flushed.
         *
         * XXX should we handle the PQUIRK_NOSYNCCACHE ?
         */

        memset(&cmd, 0, sizeof(cmd));
        cmd.opcode = SCSI_SYNCHRONIZE_CACHE_10;

        return (scsipi_command(periph, (void *)&cmd, sizeof(cmd), 0, 0,
            CDRETRIES, 30000, NULL, flags | XS_CTL_IGNORE_ILLEGAL_REQUEST));
}

static int
do_cdioreadentries(struct cd_softc *cd, struct ioc_read_toc_entry *te,
    struct cd_formatted_toc *toc)
{
        /* READ TOC format 0 command, entries */
        struct ioc_toc_header *th;
        struct cd_toc_entry *cte;
        u_int len = te->data_len;
        int ntracks;
        int error;

        th = &toc->header;

        if (len > sizeof(toc->entries) ||
            len < sizeof(toc->entries[0]))
                return (EINVAL);
        error = cd_read_toc(cd, CD_TOC_FORM, te->address_format,
            te->starting_track, toc,
            sizeof(toc->header) + len,
            0, 0);
        if (error)
                return (error);
        if (te->address_format == CD_LBA_FORMAT)
                for (ntracks =
                    th->ending_track - th->starting_track + 1;
                    ntracks >= 0; ntracks--) {
                        cte = &toc->entries[ntracks];
                        cte->addr_type = CD_LBA_FORMAT;
                        if (cd->sc_periph->periph_quirks & PQUIRK_LITTLETOC)
                                cte->addr.lba = le32toh(cte->addr.lba);
                        else
                                cte->addr.lba = be32toh(cte->addr.lba);
                }
        if (cd->sc_periph->periph_quirks & PQUIRK_LITTLETOC)
                th->len = le16toh(th->len);
        else
                th->len = be16toh(th->len);
        return 0;
}

/*
 * Perform special action on behalf of the user.
 * Knows about the internals of this device
 */
static int
cdioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
{
        struct cd_softc *cd = device_lookup_private(&cd_cd, CDUNIT(dev));
        struct dk_softc *dksc = &cd->sc_dksc;
        struct scsipi_periph *periph = cd->sc_periph;
        struct cd_formatted_toc toc;
        int part = CDPART(dev);
        int error;

        SC_DEBUG(cd->sc_periph, SCSIPI_DB2, ("cdioctl 0x%lx ", cmd));

        /*
         * If the device is not valid, some IOCTLs can still be
         * handled on the raw partition. Check this here.
         */
        if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0 &&
            part != RAW_PART)
                return (EIO);

        switch (cmd) {
        case DIOCTUR: {
                /* test unit ready */
                error = scsipi_test_unit_ready(cd->sc_periph, XS_CTL_SILENT);
                *((int*)addr) = (error == 0);
                if (error == ENODEV || error == EIO || error == 0)
                        return 0;                       
                return error;
        }
        case CDIOCPLAYTRACKS: {
                /* PLAY_MSF command */
                struct ioc_play_track *args = addr;

                if ((error = cd_set_pa_immed(cd, 0)) != 0)
                        return (error);
                return (cd_play_tracks(cd, &toc, args->start_track,
                    args->start_index, args->end_track, args->end_index));
        }
        case CDIOCPLAYMSF: {
                /* PLAY_MSF command */
                struct ioc_play_msf *args = addr;

                if ((error = cd_set_pa_immed(cd, 0)) != 0)
                        return (error);
                return (cd_play_msf(cd, args->start_m, args->start_s,
                    args->start_f, args->end_m, args->end_s, args->end_f));
        }
        case CDIOCPLAYBLOCKS: {
                /* PLAY command */
                struct ioc_play_blocks *args = addr;

                if ((error = cd_set_pa_immed(cd, 0)) != 0)
                        return (error);
                return (cd_play(cd, args->blk, args->len));
        }
        case CDIOCREADSUBCHANNEL: {
                /* READ_SUBCHANNEL command */
                struct ioc_read_subchannel *args = addr;
                struct cd_sub_channel_info data;
                u_int len = args->data_len;

                if (len > sizeof(data) ||
                    len < sizeof(struct cd_sub_channel_header))
                        return (EINVAL);
                error = cd_read_subchannel(cd, args->address_format,
                    args->data_format, args->track, &data, len, 0);
                if (error)
                        return (error);
                len = uimin(len, _2btol(data.header.data_len) +
                    sizeof(struct cd_sub_channel_header));
                return (copyout(&data, args->data, len));
        }
        case CDIOCREADSUBCHANNEL_BUF: {
                /* As CDIOCREADSUBCHANNEL, but without a 2nd buffer area */
                struct ioc_read_subchannel_buf *args = addr;
                if (args->req.data_len != sizeof args->info)
                        return EINVAL;
                return cd_read_subchannel(cd, args->req.address_format,
                    args->req.data_format, args->req.track, &args->info,
                    sizeof(args->info), 0);
        }
        case CDIOREADTOCHEADER: {
                /* READ TOC format 0 command, static header */
                if ((error = cd_read_toc(cd, CD_TOC_FORM, 0, 0,
                    &toc, sizeof(toc.header), 0, 0)) != 0)
                        return (error);
                if (cd->sc_periph->periph_quirks & PQUIRK_LITTLETOC)
                        toc.header.len = le16toh(toc.header.len);
                else
                        toc.header.len = be16toh(toc.header.len);
                memcpy(addr, &toc.header, sizeof(toc.header));
                return (0);
        }
        case CDIOREADTOCENTRYS: {
                struct ioc_read_toc_entry *te = addr;
                error = do_cdioreadentries(cd, te, &toc);
                if (error != 0)
                        return error;
                return copyout(toc.entries, te->data, uimin(te->data_len,
                    toc.header.len - (sizeof(toc.header.starting_track)
                        + sizeof(toc.header.ending_track))));
        }
        case CDIOREADTOCENTRIES_BUF: {
                struct ioc_read_toc_entry_buf *te = addr;
                error = do_cdioreadentries(cd, &te->req, &toc);
                if (error != 0)
                        return error;
                memcpy(te->entry, toc.entries, uimin(te->req.data_len,
                    toc.header.len - (sizeof(toc.header.starting_track)
                        + sizeof(toc.header.ending_track))));
                return 0;
        }
        case CDIOREADMSADDR: {
                /* READ TOC format 0 command, length of first track only */
                int sessno = *(int*)addr;

                if (sessno != 0)
                        return (EINVAL);

                return (cdreadmsaddr(cd, &toc, addr));
        }
        case CDIOCSETPATCH: {
                struct ioc_patch *arg = addr;

                return (cd_setchan(cd, arg->patch[0], arg->patch[1],
                    arg->patch[2], arg->patch[3], 0));
        }
        case CDIOCGETVOL: {
                /* MODE SENSE command (AUDIO page) */
                struct ioc_vol *arg = addr;

                return (cd_getvol(cd, arg, 0));
        }
        case CDIOCSETVOL: {
                /* MODE SENSE/MODE SELECT commands (AUDIO page) */
                struct ioc_vol *arg = addr;

                return (cd_setvol(cd, arg, 0));
        }
        case CDIOCSETMONO:
                /* MODE SENSE/MODE SELECT commands (AUDIO page) */
                return (cd_setchan(cd, BOTH_CHANNEL, BOTH_CHANNEL,
                    MUTE_CHANNEL, MUTE_CHANNEL, 0));

        case CDIOCSETSTEREO:
                /* MODE SENSE/MODE SELECT commands (AUDIO page) */
                return (cd_setchan(cd, LEFT_CHANNEL, RIGHT_CHANNEL,
                    MUTE_CHANNEL, MUTE_CHANNEL, 0));

        case CDIOCSETMUTE:
                /* MODE SENSE/MODE SELECT commands (AUDIO page) */
                return (cd_setchan(cd, MUTE_CHANNEL, MUTE_CHANNEL,
                    MUTE_CHANNEL, MUTE_CHANNEL, 0));

        case CDIOCSETLEFT:
                /* MODE SENSE/MODE SELECT commands (AUDIO page) */
                return (cd_setchan(cd, LEFT_CHANNEL, LEFT_CHANNEL,
                    MUTE_CHANNEL, MUTE_CHANNEL, 0));

        case CDIOCSETRIGHT:
                /* MODE SENSE/MODE SELECT commands (AUDIO page) */
                return (cd_setchan(cd, RIGHT_CHANNEL, RIGHT_CHANNEL,
                    MUTE_CHANNEL, MUTE_CHANNEL, 0));

        case CDIOCRESUME:
                /* PAUSE command */
                return (cd_pause(cd, PA_RESUME));
        case CDIOCPAUSE:
                /* PAUSE command */
                return (cd_pause(cd, PA_PAUSE));
        case CDIOCSTART:
                return (scsipi_start(periph, SSS_START, 0));
        case CDIOCSTOP:
                return (scsipi_start(periph, SSS_STOP, 0));
        case CDIOCCLOSE:
                return (scsipi_start(periph, SSS_START|SSS_LOEJ,
                    XS_CTL_IGNORE_NOT_READY | XS_CTL_IGNORE_MEDIA_CHANGE));
        case DIOCEJECT:
                if (*(int *)addr == 0) {
                        int pmask = __BIT(part);
                        /*
                         * Don't force eject: check that we are the only
                         * partition open. If so, unlock it.
                         */
                        if (DK_BUSY(dksc, pmask) == 0) {
                                error = scsipi_prevent(periph, SPAMR_ALLOW,
                                    XS_CTL_IGNORE_NOT_READY);
                                if (error)
                                        return (error);
                        } else {
                                return (EBUSY);
                        }
                }
                /* FALLTHROUGH */
        case CDIOCEJECT: /* FALLTHROUGH */
        case ODIOCEJECT:
                error = scsipi_start(periph, SSS_STOP|SSS_LOEJ, 0);
                if (error == 0)
                        /* Make sure cdclose() will do silent operations */
                        cd->flags |= CDF_EJECTED;
                return error;
        case DIOCCACHESYNC:
                /* SYNCHRONISE CACHES command */
                return (cdcachesync(periph, 0));
        case CDIOCALLOW:
                return (scsipi_prevent(periph, SPAMR_ALLOW, 0));
        case CDIOCPREVENT:
                return (scsipi_prevent(periph, SPAMR_PREVENT_DT, 0));
        case DIOCLOCK:
                return (scsipi_prevent(periph,
                    (*(int *)addr) ? SPAMR_PREVENT_DT : SPAMR_ALLOW, 0));
        case CDIOCSETDEBUG:
                cd->sc_periph->periph_dbflags |= (SCSIPI_DB1 | SCSIPI_DB2);
                return (0);
        case CDIOCCLRDEBUG:
                cd->sc_periph->periph_dbflags &= ~(SCSIPI_DB1 | SCSIPI_DB2);
                return (0);
        case CDIOCRESET:
        case SCIOCRESET:
                return (cd_reset(cd));
        case CDIOCLOADUNLOAD:
                /* LOAD_UNLOAD command */
                return (cd_load_unload(cd, addr));
        case DVD_AUTH:
                /* GPCMD_REPORT_KEY or GPCMD_SEND_KEY command */
                return (dvd_auth(cd, addr));
        case DVD_READ_STRUCT:
                /* GPCMD_READ_DVD_STRUCTURE command */
                return (dvd_read_struct(cd, addr));
        case MMCGETDISCINFO:
                /*
                 * GET_CONFIGURATION, READ_DISCINFO, READ_TRACKINFO,
                 * (READ_TOCf2, READ_CD_CAPACITY and GET_CONFIGURATION) commands
                 */
                return mmc_getdiscinfo(periph, (struct mmc_discinfo *) addr);
        case MMCGETTRACKINFO:
                /* READ TOCf2, READ_CD_CAPACITY and READ_TRACKINFO commands */
                return mmc_gettrackinfo(periph, (struct mmc_trackinfo *) addr);
        case MMCOP:
                /*
                 * CLOSE TRACK/SESSION, RESERVE_TRACK, REPAIR_TRACK,
                 * SYNCHRONISE_CACHE commands
                 */
                return mmc_do_op(periph, (struct mmc_op *) addr);
        case MMCSETUPWRITEPARAMS :
                /* MODE SENSE page 5, MODE_SELECT page 5 commands */
                return mmc_setup_writeparams(periph, (struct mmc_writeparams *) addr);
        default:
                error = dk_ioctl(dksc, dev, cmd, addr, flag, l); 
                if (error == ENOTTY)
                        error = scsipi_do_ioctl(periph, dev, cmd, addr, flag, l);
                return (error);
        }

#ifdef DIAGNOSTIC
        panic("cdioctl: impossible");
#endif
}

static void
cd_label(device_t self, struct disklabel *lp)
{
        struct cd_softc *cd = device_private(self);
        struct scsipi_periph *periph = cd->sc_periph;
        struct cd_formatted_toc toc;
        int lastsession = 0;

        strncpy(lp->d_typename, "optical media", 16);
        lp->d_rpm = 300;
        lp->d_flags |= D_REMOVABLE;

        if ((periph->periph_flags & PERIPH_MEDIA_LOADED) != 0) {
                lp->d_flags |= D_SCSI_MMC;
                (void) cdreadmsaddr(cd, &toc, &lastsession);
        }

        lp->d_partitions[0].p_offset = 0;
        lp->d_partitions[0].p_size = lp->d_secperunit;
        lp->d_partitions[0].p_cdsession = lastsession;
        lp->d_partitions[0].p_fstype = FS_ISO9660;

        lp->d_partitions[RAW_PART].p_offset = 0;
        lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
        lp->d_partitions[RAW_PART].p_fstype = FS_UDF;
}

/*
 * Reading a disc's total capacity is apparently a very difficult issue for the
 * SCSI standardisation group. Every disc type seems to have its own
 * (re)invented size request method and modifiers. The failsafe way of
 * determining the total (max) capacity i.e. not the recorded capacity but the
 * total maximum capacity is to request the info on the last track and
 * calculate the last lba.
 *
 * For ROM drives, we go for the CD recorded capacity. For recordable devices
 * we count.
 */
static int
read_cd_capacity(struct scsipi_periph *periph, uint32_t *blksize, u_long *last_lba)
{
        struct scsipi_read_cd_capacity    cap_cmd;
        /*
         * XXX: see PR 48550 and PR 48754:
         * the ahcisata(4) driver can not deal with unaligned
         * data, so align this "a bit"
         */
        struct scsipi_read_cd_cap_data    cap __aligned(2);
        struct scsipi_read_discinfo       di_cmd;
        struct scsipi_read_discinfo_data  di __aligned(2);
        struct scsipi_read_trackinfo      ti_cmd;
        struct scsipi_read_trackinfo_data ti __aligned(2);
        uint32_t track_start, track_size;
        int error, flags, msb, lsb, last_track;

        /* if the device doesn't grok capacity, return the dummies */
        if (periph->periph_quirks & PQUIRK_NOCAPACITY)
                return 0;

        /* first try read CD capacity for blksize and last recorded lba */
        /* issue the cd capacity request */
        flags = XS_CTL_DATA_IN;
        memset(&cap_cmd, 0, sizeof(cap_cmd));
        memset(&cap, 0, sizeof(cap));
        cap_cmd.opcode = READ_CD_CAPACITY;

        error = scsipi_command(periph,
            (void *) &cap_cmd, sizeof(cap_cmd),
            (void *) &cap,     sizeof(cap),
            CDRETRIES, 30000, NULL, flags);
        if (error)
                return error;

        /* retrieve values and sanity check them */
        *blksize  = _4btol(cap.length);
        *last_lba = _4btol(cap.addr);

        /* blksize is 2048 for CD, but some drives give gibberish */
        if ((*blksize < 512) || ((*blksize & 511) != 0)
            || (*blksize > 16*1024)) {
                if (*blksize > 16*1024)
                        aprint_error("read_cd_capacity: extra large block "
                            "size %u found - limiting to 2kByte\n",
                            *blksize);
                *blksize = 2048;        /* some drives lie ! */
        }

        /* If the device doesn't handle READ_DISCINFO properly, */
        /* return the dummies */
        if (periph->periph_quirks & PQUIRK_NOREADDISCINFO)
                return 0;

        /* recordables have READ_DISCINFO implemented */
        flags = XS_CTL_DATA_IN | XS_CTL_SILENT;
        memset(&di_cmd, 0, sizeof(di_cmd));
        di_cmd.opcode = READ_DISCINFO;
        _lto2b(READ_DISCINFO_BIGSIZE, di_cmd.data_len);

        error = scsipi_command(periph,
            (void *) &di_cmd,  sizeof(di_cmd),
            (void *) &di,      READ_DISCINFO_BIGSIZE,
            CDRETRIES, 30000, NULL, flags);
        if (error == 0) {
                msb = di.last_track_last_session_msb;
                lsb = di.last_track_last_session_lsb;
                last_track = (msb << 8) | lsb;

                /* request info on last track */
                memset(&ti_cmd, 0, sizeof(ti_cmd));
                ti_cmd.opcode = READ_TRACKINFO;
                ti_cmd.addr_type = 1;                   /* on tracknr */
                _lto4b(last_track, ti_cmd.address);     /* tracknr    */
                _lto2b(sizeof(ti), ti_cmd.data_len);

                error = scsipi_command(periph,
                    (void *) &ti_cmd,  sizeof(ti_cmd),
                    (void *) &ti,      sizeof(ti),
                    CDRETRIES, 30000, NULL, flags);
                if (error == 0) {
                        track_start = _4btol(ti.track_start);
                        track_size  = _4btol(ti.track_size);

                        /* overwrite only with a sane value */
                        if (track_start + track_size >= 100)
                                *last_lba = (u_long) track_start + track_size -1;
                }
        }

        /* sanity check for lba_size */
        if (*last_lba < 100)
                *last_lba = 400000-1;

        return 0;
}

/*
 * Find out from the device what its capacity is
 */
static u_long
cd_size(struct cd_softc *cd, int flags)
{
        uint32_t blksize = 2048;
        u_long last_lba = 0, size;
        int error;

        error = read_cd_capacity(cd->sc_periph, &blksize, &last_lba);
        if (error)
                goto error;

        if (blksize != 2048) {
                if (cd_setblksize(cd) == 0) {
                        blksize = 2048;
                        error = read_cd_capacity(cd->sc_periph,
                            &blksize, &last_lba);
                        if (error)
                                goto error;
                }
        }

        size = last_lba + 1;
        cd->params.blksize     = blksize;
        cd->params.disksize    = size;
        cd->params.disksize512 = ((u_int64_t)cd->params.disksize * blksize) / DEV_BSIZE;

        SC_DEBUG(cd->sc_periph, SCSIPI_DB2,
            ("cd_size: %u %lu\n", blksize, size));

        return size;

error:
        /* something went wrong */
        cd->params.blksize     = 2048;
        cd->params.disksize    = 0;
        cd->params.disksize512 = 0;

        SC_DEBUG(cd->sc_periph, SCSIPI_DB2, ("cd_size: failed\n"));

        return 0;
}

/*
 * Get scsi driver to send a "start playing" command
 */
static int
cd_play(struct cd_softc *cd, int blkno, int nblks)
{
        struct scsipi_play cmd;

        memset(&cmd, 0, sizeof(cmd));
        cmd.opcode = PLAY;
        _lto4b(blkno, cmd.blk_addr);
        _lto2b(nblks, cmd.xfer_len);

        return (scsipi_command(cd->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
            CDRETRIES, 30000, NULL, 0));
}

/*
 * Get scsi driver to send a "start playing" command
 */
static int
cd_play_tracks(struct cd_softc *cd, struct cd_formatted_toc *toc, int strack,
    int sindex, int etrack, int eindex)
{
        int error;

        if (!etrack)
                return (EIO);
        if (strack > etrack)
                return (EINVAL);

        error = cd_load_toc(cd, CD_TOC_FORM, toc, 0);
        if (error)
                return (error);

        if (++etrack > (toc->header.ending_track+1))
                etrack = toc->header.ending_track+1;

        strack -= toc->header.starting_track;
        etrack -= toc->header.starting_track;
        if (strack < 0)
                return (EINVAL);

        return (cd_play_msf(cd, toc->entries[strack].addr.msf.minute,
            toc->entries[strack].addr.msf.second,
            toc->entries[strack].addr.msf.frame,
            toc->entries[etrack].addr.msf.minute,
            toc->entries[etrack].addr.msf.second,
            toc->entries[etrack].addr.msf.frame));
}

/*
 * Get scsi driver to send a "play msf" command
 */
static int
cd_play_msf(struct cd_softc *cd, int startm, int starts, int startf, int endm,
    int ends, int endf)
{
        struct scsipi_play_msf cmd;

        memset(&cmd, 0, sizeof(cmd));
        cmd.opcode = PLAY_MSF;
        cmd.start_m = startm;
        cmd.start_s = starts;
        cmd.start_f = startf;
        cmd.end_m = endm;
        cmd.end_s = ends;
        cmd.end_f = endf;

        return (scsipi_command(cd->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
            CDRETRIES, 30000, NULL, 0));
}

/*
 * Get scsi driver to send a "start up" command
 */
static int
cd_pause(struct cd_softc *cd, int go)
{
        struct scsipi_pause cmd;

        memset(&cmd, 0, sizeof(cmd));
        cmd.opcode = PAUSE;
        cmd.resume = go & 0xff;

        return (scsipi_command(cd->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
            CDRETRIES, 30000, NULL, 0));
}

/*
 * Get scsi driver to send a "RESET" command
 */
static int
cd_reset(struct cd_softc *cd)
{

        return (scsipi_command(cd->sc_periph, 0, 0, 0, 0,
            CDRETRIES, 30000, NULL, XS_CTL_RESET));
}

/*
 * Read subchannel
 */
static int
cd_read_subchannel(struct cd_softc *cd, int mode, int format, int track,
    struct cd_sub_channel_info *data, int len, int flags)
{
        struct scsipi_read_subchannel cmd;

        memset(&cmd, 0, sizeof(cmd));
        cmd.opcode = READ_SUBCHANNEL;
        if (mode == CD_MSF_FORMAT)
                cmd.byte2 |= CD_MSF;
        cmd.byte3 = SRS_SUBQ;
        cmd.subchan_format = format;
        cmd.track = track;
        _lto2b(len, cmd.data_len);

        return (scsipi_command(cd->sc_periph,
            (void *)&cmd, sizeof(struct scsipi_read_subchannel),
            (void *)data, len,
            CDRETRIES, 30000, NULL, flags | XS_CTL_DATA_IN | XS_CTL_SILENT));
}

/*
 * Read table of contents
 */
static int
cd_read_toc(struct cd_softc *cd, int respf, int mode, int start,
    struct cd_formatted_toc *toc, int len, int flags, int control)
{
        struct scsipi_read_toc cmd;
        int ntoc;

        memset(&cmd, 0, sizeof(cmd));
#if 0
        if (len != sizeof(struct ioc_toc_header))
                ntoc = ((len) - sizeof(struct ioc_toc_header)) /
                    sizeof(struct cd_toc_entry);
        else
#endif
        ntoc = len;
        cmd.opcode = READ_TOC;
        if (mode == CD_MSF_FORMAT)
                cmd.addr_mode |= CD_MSF;
        cmd.resp_format = respf;
        cmd.from_track = start;
        _lto2b(ntoc, cmd.data_len);
        cmd.control = control;

        return (scsipi_command(cd->sc_periph,
            (void *)&cmd, sizeof(cmd), (void *)toc, len, CDRETRIES,
            30000, NULL, flags | XS_CTL_DATA_IN));
}

static int
cd_load_toc(struct cd_softc *cd, int respf, struct cd_formatted_toc *toc, int flags)
{
        int ntracks, len, error;

        if ((error = cd_read_toc(cd, respf, 0, 0, toc, sizeof(toc->header),
            flags, 0)) != 0)
                return (error);

        ntracks = toc->header.ending_track - toc->header.starting_track + 1;
        len = (ntracks + 1) * sizeof(struct cd_toc_entry) +
            sizeof(toc->header);
        if ((error = cd_read_toc(cd, respf, CD_MSF_FORMAT, 0, toc, len,
            flags, 0)) != 0)
                return (error);
        return (0);
}

/*
 * Get the scsi driver to send a full inquiry to the device and use the
 * results to fill out the disk parameter structure.
 */
static int
cd_get_parms(struct cd_softc *cd, int flags)
{

        /*
         * give a number of sectors so that sec * trks * cyls
         * is <= disk_size
         */
        if (cd_size(cd, flags) == 0)
                return (ENXIO);
        return (0);
}

static int
cdsize(dev_t dev)
{

        /* CD-ROMs are read-only. */
        return (-1);
}

static int
cddump(dev_t dev, daddr_t blkno, void *va, size_t size)
{

        /* Not implemented. */
        return (ENXIO);
}

#define dvd_copy_key(dst, src)          memcpy((dst), (src), sizeof(dvd_key))
#define dvd_copy_challenge(dst, src)    memcpy((dst), (src), sizeof(dvd_challenge))

static int
dvd_auth(struct cd_softc *cd, dvd_authinfo *a)
{
        struct scsipi_generic cmd;
        u_int8_t bf[20];
        int error;

        memset(cmd.bytes, 0, 15);
        memset(bf, 0, sizeof(bf));

        switch (a->type) {
        case DVD_LU_SEND_AGID:
                cmd.opcode = GPCMD_REPORT_KEY;
                cmd.bytes[8] = 8;
                cmd.bytes[9] = 0 | (0 << 6);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 8,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
                if (error)
                        return (error);
                a->lsa.agid = bf[7] >> 6;
                return (0);

        case DVD_LU_SEND_CHALLENGE:
                cmd.opcode = GPCMD_REPORT_KEY;
                cmd.bytes[8] = 16;
                cmd.bytes[9] = 1 | (a->lsc.agid << 6);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 16,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
                if (error)
                        return (error);
                dvd_copy_challenge(a->lsc.chal, &bf[4]);
                return (0);

        case DVD_LU_SEND_KEY1:
                cmd.opcode = GPCMD_REPORT_KEY;
                cmd.bytes[8] = 12;
                cmd.bytes[9] = 2 | (a->lsk.agid << 6);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 12,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
                if (error)
                        return (error);
                dvd_copy_key(a->lsk.key, &bf[4]);
                return (0);

        case DVD_LU_SEND_TITLE_KEY:
                cmd.opcode = GPCMD_REPORT_KEY;
                _lto4b(a->lstk.lba, &cmd.bytes[1]);
                cmd.bytes[8] = 12;
                cmd.bytes[9] = 4 | (a->lstk.agid << 6);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 12,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
                if (error)
                        return (error);
                a->lstk.cpm = (bf[4] >> 7) & 1;
                a->lstk.cp_sec = (bf[4] >> 6) & 1;
                a->lstk.cgms = (bf[4] >> 4) & 3;
                dvd_copy_key(a->lstk.title_key, &bf[5]);
                return (0);

        case DVD_LU_SEND_ASF:
                cmd.opcode = GPCMD_REPORT_KEY;
                cmd.bytes[8] = 8;
                cmd.bytes[9] = 5 | (a->lsasf.agid << 6);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 8,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
                if (error)
                        return (error);
                a->lsasf.asf = bf[7] & 1;
                return (0);

        case DVD_HOST_SEND_CHALLENGE:
                cmd.opcode = GPCMD_SEND_KEY;
                cmd.bytes[8] = 16;
                cmd.bytes[9] = 1 | (a->hsc.agid << 6);
                bf[1] = 14;
                dvd_copy_challenge(&bf[4], a->hsc.chal);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 16,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_OUT);
                if (error)
                        return (error);
                a->type = DVD_LU_SEND_KEY1;
                return (0);

        case DVD_HOST_SEND_KEY2:
                cmd.opcode = GPCMD_SEND_KEY;
                cmd.bytes[8] = 12;
                cmd.bytes[9] = 3 | (a->hsk.agid << 6);
                bf[1] = 10;
                dvd_copy_key(&bf[4], a->hsk.key);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 12,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_OUT);
                if (error) {
                        a->type = DVD_AUTH_FAILURE;
                        return (error);
                }
                a->type = DVD_AUTH_ESTABLISHED;
                return (0);

        case DVD_INVALIDATE_AGID:
                cmd.opcode = GPCMD_REPORT_KEY;
                cmd.bytes[9] = 0x3f | (a->lsa.agid << 6);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 16,
                    CDRETRIES, 30000, NULL, 0);
                if (error)
                        return (error);
                return (0);

        case DVD_LU_SEND_RPC_STATE:
                cmd.opcode = GPCMD_REPORT_KEY;
                cmd.bytes[8] = 8;
                cmd.bytes[9] = 8 | (0 << 6);
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 8,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
                if (error)
                        return (error);
                a->lrpcs.type = (bf[4] >> 6) & 3;
                a->lrpcs.vra = (bf[4] >> 3) & 7;
                a->lrpcs.ucca = (bf[4]) & 7;
                a->lrpcs.region_mask = bf[5];
                a->lrpcs.rpc_scheme = bf[6];
                return (0);

        case DVD_HOST_SEND_RPC_STATE:
                cmd.opcode = GPCMD_SEND_KEY;
                cmd.bytes[8] = 8;
                cmd.bytes[9] = 6 | (0 << 6);
                bf[1] = 6;
                bf[4] = a->hrpcs.pdrc;
                error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 8,
                    CDRETRIES, 30000, NULL, XS_CTL_DATA_OUT);
                if (error)
                        return (error);
                return (0);

        default:
                return (ENOTTY);
        }
}

static int
dvd_read_physical(struct cd_softc *cd, dvd_struct *s)
{
        struct scsipi_generic cmd;
        u_int8_t bf[4 + 4 * 20], *bufp;
        int error;
        struct dvd_layer *layer;
        int i;

        memset(cmd.bytes, 0, 15);
        memset(bf, 0, sizeof(bf));
        cmd.opcode = GPCMD_READ_DVD_STRUCTURE;
        cmd.bytes[6] = s->type;
        _lto2b(sizeof(bf), &cmd.bytes[7]);

        cmd.bytes[5] = s->physical.layer_num;
        error = scsipi_command(cd->sc_periph, &cmd, 12, bf, sizeof(bf),
            CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
        if (error)
                return (error);
        for (i = 0, bufp = &bf[4], layer = &s->physical.layer[0]; i < 4;
             i++, bufp += 20, layer++) {
                memset(layer, 0, sizeof(*layer));
                layer->book_version = bufp[0] & 0xf;
                layer->book_type = bufp[0] >> 4;
                layer->min_rate = bufp[1] & 0xf;
                layer->disc_size = bufp[1] >> 4;
                layer->layer_type = bufp[2] & 0xf;
                layer->track_path = (bufp[2] >> 4) & 1;
                layer->nlayers = (bufp[2] >> 5) & 3;
                layer->track_density = bufp[3] & 0xf;
                layer->linear_density = bufp[3] >> 4;
                layer->start_sector = _4btol(&bufp[4]);
                layer->end_sector = _4btol(&bufp[8]);
                layer->end_sector_l0 = _4btol(&bufp[12]);
                layer->bca = bufp[16] >> 7;
        }
        return (0);
}

static int
dvd_read_copyright(struct cd_softc *cd, dvd_struct *s)
{
        struct scsipi_generic cmd;
        u_int8_t bf[8];
        int error;

        memset(cmd.bytes, 0, 15);
        memset(bf, 0, sizeof(bf));
        cmd.opcode = GPCMD_READ_DVD_STRUCTURE;
        cmd.bytes[6] = s->type;
        _lto2b(sizeof(bf), &cmd.bytes[7]);

        cmd.bytes[5] = s->copyright.layer_num;
        error = scsipi_command(cd->sc_periph, &cmd, 12, bf, sizeof(bf),
            CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
        if (error)
                return (error);
        s->copyright.cpst = bf[4];
        s->copyright.rmi = bf[5];
        return (0);
}

static int
dvd_read_disckey(struct cd_softc *cd, dvd_struct *s)
{
        struct scsipi_generic cmd;
        u_int8_t *bf;
        int error;

        bf = malloc(4 + 2048, M_TEMP, M_WAITOK|M_ZERO);
        if (bf == NULL)
                return EIO;
        memset(cmd.bytes, 0, 15);
        cmd.opcode = GPCMD_READ_DVD_STRUCTURE;
        cmd.bytes[6] = s->type;
        _lto2b(4 + 2048, &cmd.bytes[7]);

        cmd.bytes[9] = s->disckey.agid << 6;
        error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 4 + 2048,
            CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
        if (error == 0)
                memcpy(s->disckey.value, &bf[4], 2048);
        free(bf, M_TEMP);
        return error;
}

static int
dvd_read_bca(struct cd_softc *cd, dvd_struct *s)
{
        struct scsipi_generic cmd;
        u_int8_t bf[4 + 188];
        int error;

        memset(cmd.bytes, 0, 15);
        memset(bf, 0, sizeof(bf));
        cmd.opcode = GPCMD_READ_DVD_STRUCTURE;
        cmd.bytes[6] = s->type;
        _lto2b(sizeof(bf), &cmd.bytes[7]);

        error = scsipi_command(cd->sc_periph, &cmd, 12, bf, sizeof(bf),
            CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
        if (error)
                return (error);
        s->bca.len = _2btol(&bf[0]);
        if (s->bca.len < 12 || s->bca.len > 188)
                return (EIO);
        memcpy(s->bca.value, &bf[4], s->bca.len);
        return (0);
}

static int
dvd_read_manufact(struct cd_softc *cd, dvd_struct *s)
{
        struct scsipi_generic cmd;
        u_int8_t *bf;
        int error;

        bf = malloc(4 + 2048, M_TEMP, M_WAITOK|M_ZERO);
        if (bf == NULL)
                return (EIO);
        memset(cmd.bytes, 0, 15);
        cmd.opcode = GPCMD_READ_DVD_STRUCTURE;
        cmd.bytes[6] = s->type;
        _lto2b(4 + 2048, &cmd.bytes[7]);

        error = scsipi_command(cd->sc_periph, &cmd, 12, bf, 4 + 2048,
            CDRETRIES, 30000, NULL, XS_CTL_DATA_IN);
        if (error == 0) {
                s->manufact.len = _2btol(&bf[0]);
                if (s->manufact.len >= 0 && s->manufact.len <= 2048)
                        memcpy(s->manufact.value, &bf[4], s->manufact.len);
                else
                        error = EIO;
        }
        free(bf, M_TEMP);
        return error;
}

static int
dvd_read_struct(struct cd_softc *cd, dvd_struct *s)
{

        switch (s->type) {
        case DVD_STRUCT_PHYSICAL:
                return (dvd_read_physical(cd, s));
        case DVD_STRUCT_COPYRIGHT:
                return (dvd_read_copyright(cd, s));
        case DVD_STRUCT_DISCKEY:
                return (dvd_read_disckey(cd, s));
        case DVD_STRUCT_BCA:
                return (dvd_read_bca(cd, s));
        case DVD_STRUCT_MANUFACT:
                return (dvd_read_manufact(cd, s));
        default:
                return (EINVAL);
        }
}

static int
cd_mode_sense(struct cd_softc *cd, u_int8_t byte2, void *sense, size_t size,
    int page, int flags, int *big)
{

        if (cd->sc_periph->periph_quirks & PQUIRK_ONLYBIG) {
                *big = 1;
                return scsipi_mode_sense_big(cd->sc_periph, byte2, page, sense,
                    size + sizeof(struct scsi_mode_parameter_header_10),
                    flags, CDRETRIES, 20000);
        } else {
                *big = 0;
                return scsipi_mode_sense(cd->sc_periph, byte2, page, sense,
                    size + sizeof(struct scsi_mode_parameter_header_6),
                    flags, CDRETRIES, 20000);
        }
}

static int
cd_mode_select(struct cd_softc *cd, u_int8_t byte2, void *sense, size_t size,
    int flags, int big)
{

        if (big) {
                struct scsi_mode_parameter_header_10 *header = sense;

                _lto2b(0, header->data_length);
                return scsipi_mode_select_big(cd->sc_periph, byte2, sense,
                    size + sizeof(struct scsi_mode_parameter_header_10),
                    flags, CDRETRIES, 20000);
        } else {
                struct scsi_mode_parameter_header_6 *header = sense;

                header->data_length = 0;
                return scsipi_mode_select(cd->sc_periph, byte2, sense,
                    size + sizeof(struct scsi_mode_parameter_header_6),
                    flags, CDRETRIES, 20000);
        }
}

static int
cd_set_pa_immed(struct cd_softc *cd, int flags)
{
        struct {
                union {
                        struct scsi_mode_parameter_header_6 small;
                        struct scsi_mode_parameter_header_10 big;
                } header;
                struct cd_audio_page page;
        } data;
        int error;
        uint8_t oflags;
        int big, byte2;
        struct cd_audio_page *page;

        byte2 = SMS_DBD;
try_again:
        if ((error = cd_mode_sense(cd, byte2, &data, sizeof(data.page),
            AUDIO_PAGE, flags, &big)) != 0) {
                if (byte2 == SMS_DBD) {
                        /* Device may not understand DBD; retry without */
                        byte2 = 0;
                        goto try_again;
                }
                return (error);
        }

        if (big)
                page = (void *)((u_long)&data.header.big +
                                sizeof data.header.big +
                                _2btol(data.header.big.blk_desc_len));
        else
                page = (void *)((u_long)&data.header.small +
                                sizeof data.header.small +
                                data.header.small.blk_desc_len);

        oflags = page->flags;
        page->flags &= ~CD_PA_SOTC;
        page->flags |= CD_PA_IMMED;
        if (oflags == page->flags)
                return (0);

        return (cd_mode_select(cd, SMS_PF, &data,
            sizeof(struct scsi_mode_page_header) + page->pg_length,
            flags, big));
}

static int
cd_setchan(struct cd_softc *cd, int p0, int p1, int p2, int p3, int flags)
{
        struct {
                union {
                        struct scsi_mode_parameter_header_6 small;
                        struct scsi_mode_parameter_header_10 big;
                } header;
                struct cd_audio_page page;
        } data;
        int error;
        int big, byte2;
        struct cd_audio_page *page;

        byte2 = SMS_DBD;
try_again:
        if ((error = cd_mode_sense(cd, byte2, &data, sizeof(data.page),
            AUDIO_PAGE, flags, &big)) != 0) {
                if (byte2 == SMS_DBD) {
                        /* Device may not understand DBD; retry without */
                        byte2 = 0;
                        goto try_again;
                }
                return (error);
        }

        if (big)
                page = (void *)((u_long)&data.header.big +
                                sizeof data.header.big +
                                _2btol(data.header.big.blk_desc_len));
        else
                page = (void *)((u_long)&data.header.small +
                                sizeof data.header.small +
                                data.header.small.blk_desc_len);

        page->port[0].channels = p0;
        page->port[1].channels = p1;
        page->port[2].channels = p2;
        page->port[3].channels = p3;

        return (cd_mode_select(cd, SMS_PF, &data,
            sizeof(struct scsi_mode_page_header) + page->pg_length,
            flags, big));
}

static int
cd_getvol(struct cd_softc *cd, struct ioc_vol *arg, int flags)
{
        struct {
                union {
                        struct scsi_mode_parameter_header_6 small;
                        struct scsi_mode_parameter_header_10 big;
                } header;
                struct cd_audio_page page;
        } data;
        int error;
        int big, byte2;
        struct cd_audio_page *page;

        byte2 = SMS_DBD;
try_again:
        if ((error = cd_mode_sense(cd, byte2, &data, sizeof(data.page),
            AUDIO_PAGE, flags, &big)) != 0) {
                if (byte2 == SMS_DBD) {
                        /* Device may not understand DBD; retry without */
                        byte2 = 0;
                        goto try_again;
                }
                return (error);
        }

        if (big)
                page = (void *)((u_long)&data.header.big +
                                sizeof data.header.big +
                                _2btol(data.header.big.blk_desc_len));
        else
                page = (void *)((u_long)&data.header.small +
                                sizeof data.header.small +
                                data.header.small.blk_desc_len);

        arg->vol[0] = page->port[0].volume;
        arg->vol[1] = page->port[1].volume;
        arg->vol[2] = page->port[2].volume;
        arg->vol[3] = page->port[3].volume;

        return (0);
}

static int
cd_setvol(struct cd_softc *cd, const struct ioc_vol *arg, int flags)
{
        struct {
                union {
                        struct scsi_mode_parameter_header_6 small;
                        struct scsi_mode_parameter_header_10 big;
                } header;
                struct cd_audio_page page;
        } data, mask;
        int error;
        int big, byte2;
        struct cd_audio_page *page, *page2;

        byte2 = SMS_DBD;
try_again:
        if ((error = cd_mode_sense(cd, byte2, &data, sizeof(data.page),
            AUDIO_PAGE, flags, &big)) != 0) {
                if (byte2 == SMS_DBD) {
                        /* Device may not understand DBD; retry without */
                        byte2 = 0;
                        goto try_again;
                }
                return (error);
        }
        if ((error = cd_mode_sense(cd, byte2, &mask, sizeof(mask.page),
            AUDIO_PAGE|SMS_PCTRL_CHANGEABLE, flags, &big)) != 0)
                return (error);

        if (big) {
                page = (void *)((u_long)&data.header.big +
                                sizeof data.header.big +
                                _2btol(data.header.big.blk_desc_len));
                page2 = (void *)((u_long)&mask.header.big +
                                sizeof mask.header.big +
                                _2btol(mask.header.big.blk_desc_len));
        } else {
                page = (void *)((u_long)&data.header.small +
                                sizeof data.header.small +
                                data.header.small.blk_desc_len);
                page2 = (void *)((u_long)&mask.header.small +
                                sizeof mask.header.small +
                                mask.header.small.blk_desc_len);
        }

        page->port[0].volume = arg->vol[0] & page2->port[0].volume;
        page->port[1].volume = arg->vol[1] & page2->port[1].volume;
        page->port[2].volume = arg->vol[2] & page2->port[2].volume;
        page->port[3].volume = arg->vol[3] & page2->port[3].volume;

        page->port[0].channels = CHANNEL_0;
        page->port[1].channels = CHANNEL_1;

        return (cd_mode_select(cd, SMS_PF, &data,
            sizeof(struct scsi_mode_page_header) + page->pg_length,
            flags, big));
}

static int
cd_load_unload(struct cd_softc *cd, struct ioc_load_unload *args)
{
        struct scsipi_load_unload cmd;

        memset(&cmd, 0, sizeof(cmd));
        cmd.opcode = LOAD_UNLOAD;
        cmd.options = args->options;    /* ioctl uses MMC values */
        cmd.slot = args->slot;

        return (scsipi_command(cd->sc_periph, (void *)&cmd, sizeof(cmd), 0, 0,
            CDRETRIES, 200000, NULL, 0));
}

static int
cd_setblksize(struct cd_softc *cd)
{
        struct {
                union {
                        struct scsi_mode_parameter_header_6 small;
                        struct scsi_mode_parameter_header_10 big;
                } header;
                struct scsi_general_block_descriptor blk_desc;
        } data;
        int error;
        int big, bsize;
        struct scsi_general_block_descriptor *bdesc;

        if ((error = cd_mode_sense(cd, 0, &data, sizeof(data.blk_desc), 0, 0,
            &big)) != 0)
                return (error);

        if (big) {
                bdesc = (void *)(&data.header.big + 1);
                bsize = _2btol(data.header.big.blk_desc_len);
        } else {
                bdesc = (void *)(&data.header.small + 1);
                bsize = data.header.small.blk_desc_len;
        }

        if (bsize == 0) {
                printf("cd_setblksize: trying to change bsize, but no blk_desc\n");
                
                return (EINVAL);
        }
        if (_3btol(bdesc->blklen) == 2048) {
                printf("cd_setblksize: trying to change bsize, but blk_desc is correct\n");
                return (EINVAL);
        }

        _lto3b(2048, bdesc->blklen);

        return (cd_mode_select(cd, SMS_PF, &data, sizeof(data.blk_desc), 0,
            big));
}


static int
mmc_profile2class(uint16_t mmc_profile)
{
        switch (mmc_profile) {
        case 0x01 : /* SCSI discs */
        case 0x02 :
                /* this can't happen really, cd.c wouldn't have matched */
                return MMC_CLASS_DISC;
        case 0x03 : /* Magneto Optical with sector erase */
        case 0x04 : /* Magneto Optical write once        */
        case 0x05 : /* Advance Storage Magneto Optical   */
                return MMC_CLASS_MO;
        case 0x00 : /* Unknown MMC profile, can also be CD-ROM */
        case 0x08 : /* CD-ROM  */
        case 0x09 : /* CD-R    */
        case 0x0a : /* CD-RW   */
                return MMC_CLASS_CD;
        case 0x10 : /* DVD-ROM */
        case 0x11 : /* DVD-R   */
        case 0x12 : /* DVD-RAM */
        case 0x13 : /* DVD-RW restricted overwrite */
        case 0x14 : /* DVD-RW sequential */
        case 0x1a : /* DVD+RW  */
        case 0x1b : /* DVD+R   */
        case 0x2a : /* DVD+RW Dual layer */
        case 0x2b : /* DVD+R Dual layer */
        case 0x50 : /* HD DVD-ROM */
        case 0x51 : /* HD DVD-R   */
        case 0x52 : /* HD DVD-RW; DVD-RAM like */
                return MMC_CLASS_DVD;
        case 0x40 : /* BD-ROM  */
        case 0x41 : /* BD-R Sequential recording (SRM) */
        case 0x42 : /* BD-R Random Recording (RRM) */
        case 0x43 : /* BD-RE */
                return MMC_CLASS_BD;
        }
        return MMC_CLASS_UNKN;
}


/*
 * Drive/media combination is reflected in a series of features that can
 * either be current or dormant. We try to make sense out of them to create a
 * set of easy to use flags that abstract the device/media capabilities.
 */

static void
mmc_process_feature(struct mmc_discinfo *mmc_discinfo,
                    uint16_t feature, int cur, uint8_t *rpos)
{
        uint32_t blockingnr;
        uint64_t flags;

        if (cur == 1) {
                flags = mmc_discinfo->mmc_cur;
        } else {
                flags = mmc_discinfo->mmc_cap;
        }

        switch (feature) {
        case 0x0010 :   /* random readable feature */
                blockingnr  =  rpos[5] | (rpos[4] << 8);
                if (blockingnr > 1)
                        flags |= MMC_CAP_PACKET;

                /* RW error page */
                break;
        case 0x0020 :   /* random writable feature */
                flags |= MMC_CAP_RECORDABLE;
                flags |= MMC_CAP_REWRITABLE;
                blockingnr  =  rpos[9] | (rpos[8] << 8);
                if (blockingnr > 1)
                        flags |= MMC_CAP_PACKET;
                break;
        case 0x0021 :   /* incremental streaming write feature */
                flags |= MMC_CAP_RECORDABLE;
                flags |= MMC_CAP_SEQUENTIAL;
                if (cur)
                        mmc_discinfo->link_block_penalty = rpos[4];
                if (rpos[2] & 1)
                        flags |= MMC_CAP_ZEROLINKBLK;
                break;
        case 0x0022 :   /* (obsolete) erase support feature */
                flags |= MMC_CAP_RECORDABLE;
                flags |= MMC_CAP_ERASABLE;
                break;
        case 0x0023 :   /* formatting media support feature */
                flags |= MMC_CAP_RECORDABLE;
                flags |= MMC_CAP_FORMATTABLE;
                break;
        case 0x0024 :   /* hardware assisted defect management feature */
                flags |= MMC_CAP_HW_DEFECTFREE;
                break;
        case 0x0025 :   /* write once */
                flags |= MMC_CAP_RECORDABLE;
                break;
        case 0x0026 :   /* restricted overwrite feature */
                flags |= MMC_CAP_RECORDABLE;
                flags |= MMC_CAP_REWRITABLE;
                flags |= MMC_CAP_STRICTOVERWRITE;
                break;
        case 0x0028 :   /* MRW formatted media support feature */
                flags |= MMC_CAP_MRW;
                break;
        case 0x002b :   /* DVD+R read (and opt. write) support */
                flags |= MMC_CAP_SEQUENTIAL;
                if (rpos[0] & 1) /* write support */
                        flags |= MMC_CAP_RECORDABLE;
                break;
        case 0x002c :   /* rigid restricted overwrite feature */
                flags |= MMC_CAP_RECORDABLE;
                flags |= MMC_CAP_REWRITABLE;
                flags |= MMC_CAP_STRICTOVERWRITE;
                if (rpos[0] & 1) /* blank bit */
                        flags |= MMC_CAP_BLANKABLE;
                break;
        case 0x002d :   /* track at once recording feature */
                flags |= MMC_CAP_RECORDABLE;
                flags |= MMC_CAP_SEQUENTIAL;
                break;
        case 0x002f :   /* DVD-R/-RW write feature */
                flags |= MMC_CAP_RECORDABLE;
                if (rpos[0] & 2) /* DVD-RW bit */
                        flags |= MMC_CAP_BLANKABLE;
                break;
        case 0x0038 :   /* BD-R SRM with pseudo overwrite */
                flags |= MMC_CAP_PSEUDOOVERWRITE;
                break;
        default :
                /* ignore */
                break;
        }

        if (cur == 1) {
                mmc_discinfo->mmc_cur = flags;
        } else {
                mmc_discinfo->mmc_cap = flags;
        }
}

static int
mmc_getdiscinfo_cdrom(struct scsipi_periph *periph,
                      struct mmc_discinfo *mmc_discinfo)
{
        struct scsipi_read_toc      gtoc_cmd;
        struct scsipi_toc_header   *toc_hdr;
        struct scsipi_toc_msinfo   *toc_msinfo;
        const uint32_t buffer_size = 1024;
        uint32_t req_size;
        uint8_t  *buffer;
        int error, flags;

        buffer = malloc(buffer_size, M_TEMP, M_WAITOK);
        /*
         * Fabricate mmc_discinfo for CD-ROM. Some values are really `dont
         * care' but others might be of interest to programs.
         */

        mmc_discinfo->disc_state         = MMC_STATE_FULL;
        mmc_discinfo->last_session_state = MMC_STATE_FULL;
        mmc_discinfo->bg_format_state    = MMC_BGFSTATE_COMPLETED;
        mmc_discinfo->link_block_penalty = 7;   /* not relevant */

        /* get number of sessions and first tracknr in last session */
        flags = XS_CTL_DATA_IN;
        memset(&gtoc_cmd, 0, sizeof(gtoc_cmd));
        gtoc_cmd.opcode      = READ_TOC;
        gtoc_cmd.addr_mode   = CD_MSF;          /* not relevant        */
        gtoc_cmd.resp_format = CD_TOC_MSINFO;   /* multisession info   */
        gtoc_cmd.from_track  = 0;               /* reserved, must be 0 */
        req_size = sizeof(*toc_hdr) + sizeof(*toc_msinfo);
        _lto2b(req_size, gtoc_cmd.data_len);

        error = scsipi_command(periph,
                (void *)&gtoc_cmd, sizeof(gtoc_cmd),
                (void *)buffer,    req_size,
                CDRETRIES, 30000, NULL, flags);
        if (error)
                goto out;
        toc_hdr    = (struct scsipi_toc_header *)  buffer;
        toc_msinfo = (struct scsipi_toc_msinfo *) (buffer + 4);
        mmc_discinfo->num_sessions = toc_hdr->last - toc_hdr->first + 1;
        mmc_discinfo->first_track  = toc_hdr->first;
        mmc_discinfo->first_track_last_session = toc_msinfo->tracknr;

        /* get last track of last session */
        flags = XS_CTL_DATA_IN;
        gtoc_cmd.resp_format  = CD_TOC_FORM;    /* formatted toc */
        req_size = sizeof(*toc_hdr);
        _lto2b(req_size, gtoc_cmd.data_len);

        error = scsipi_command(periph,
                (void *)&gtoc_cmd, sizeof(gtoc_cmd),
                (void *)buffer,    req_size,
                CDRETRIES, 30000, NULL, flags);
        if (error)
                goto out;
        toc_hdr    = (struct scsipi_toc_header *) buffer;
        mmc_discinfo->last_track_last_session = toc_hdr->last;
        mmc_discinfo->num_tracks = toc_hdr->last - toc_hdr->first + 1;

        /* TODO how to handle disc_barcode and disc_id */
        /* done */

out:
        free(buffer, M_TEMP);
        return error;
}

static int
mmc_getdiscinfo_dvdrom(struct scsipi_periph *periph,
                       struct mmc_discinfo *mmc_discinfo)
{
        struct scsipi_read_toc   gtoc_cmd;
        struct scsipi_toc_header toc_hdr;
        uint32_t req_size;
        int error, flags;

        /*
         * Fabricate mmc_discinfo for DVD-ROM. Some values are really `dont
         * care' but others might be of interest to programs.
         */

        mmc_discinfo->disc_state         = MMC_STATE_FULL;
        mmc_discinfo->last_session_state = MMC_STATE_FULL;
        mmc_discinfo->bg_format_state    = MMC_BGFSTATE_COMPLETED;
        mmc_discinfo->link_block_penalty = 16;  /* not relevant */

        /* get number of sessions and first tracknr in last session */
        flags = XS_CTL_DATA_IN;
        memset(&gtoc_cmd, 0, sizeof(gtoc_cmd));
        gtoc_cmd.opcode      = READ_TOC;
        gtoc_cmd.addr_mode   = 0;               /* LBA                 */
        gtoc_cmd.resp_format = CD_TOC_FORM;     /* multisession info   */
        gtoc_cmd.from_track  = 1;               /* first track         */
        req_size = sizeof(toc_hdr);
        _lto2b(req_size, gtoc_cmd.data_len);

        error = scsipi_command(periph,
                (void *)&gtoc_cmd, sizeof(gtoc_cmd),
                (void *)&toc_hdr,  req_size,
                CDRETRIES, 30000, NULL, flags);
        if (error)
                return error;

        /* DVD-ROM squashes the track/session space */
        mmc_discinfo->num_sessions = toc_hdr.last - toc_hdr.first + 1;
        mmc_discinfo->num_tracks   = mmc_discinfo->num_sessions;
        mmc_discinfo->first_track  = toc_hdr.first;
        mmc_discinfo->first_track_last_session = toc_hdr.last;
        mmc_discinfo->last_track_last_session  = toc_hdr.last;

        /* TODO how to handle disc_barcode and disc_id */
        /* done */
        return 0;
}

static int
mmc_getdiscinfo(struct scsipi_periph *periph,
                struct mmc_discinfo *mmc_discinfo)
{
        struct scsipi_get_configuration   gc_cmd;
        struct scsipi_get_conf_data      *gc;
        struct scsipi_get_conf_feature   *gcf;
        struct scsipi_read_discinfo       di_cmd;
        struct scsipi_read_discinfo_data  di __aligned(2);
        const uint32_t buffer_size = 0x200; /* XXX RPZ USB3 SCSI size issue */
        uint32_t pos;
        u_long   last_lba = 0;
        uint8_t  *buffer, *fpos;
        int feature, last_feature, features_len, feature_cur, feature_len;
        int lsb, msb, error, flags;

        buffer = malloc(buffer_size, M_TEMP, M_WAITOK);

        /* initialise structure */
        memset(mmc_discinfo, 0, sizeof(struct mmc_discinfo));
        mmc_discinfo->mmc_profile = 0x00;       /* unknown */
        mmc_discinfo->mmc_class   = MMC_CLASS_UNKN;
        mmc_discinfo->mmc_cur     = 0;
        mmc_discinfo->mmc_cap     = 0;
        mmc_discinfo->link_block_penalty = 0;

        /* determine mmc profile and class */
        flags = XS_CTL_DATA_IN;
        memset(&gc_cmd, 0, sizeof(gc_cmd));
        gc_cmd.opcode = GET_CONFIGURATION;
        _lto2b(GET_CONF_NO_FEATURES_LEN, gc_cmd.data_len);

        gc = (struct scsipi_get_conf_data *) buffer;

        error = scsipi_command(periph,
                (void *)&gc_cmd, sizeof(gc_cmd),
                (void *) gc,     GET_CONF_NO_FEATURES_LEN,
                CDRETRIES, 30000, NULL, flags);
        if (error)
                goto out;

        mmc_discinfo->mmc_profile = _2btol(gc->mmc_profile);
        mmc_discinfo->mmc_class = mmc_profile2class(mmc_discinfo->mmc_profile);

        /* assume 2048 sector size unless told otherwise */
        mmc_discinfo->sector_size = 2048;
        error = read_cd_capacity(periph, &mmc_discinfo->sector_size, &last_lba);
        if (error)
                goto out;

        mmc_discinfo->last_possible_lba = (uint32_t) last_lba;

        /* Read in all features to determine device capabilities */
        last_feature = feature = 0;
        do {
                /* determine mmc profile and class */
                flags = XS_CTL_DATA_IN;
                memset(&gc_cmd, 0, sizeof(gc_cmd));
                gc_cmd.opcode = GET_CONFIGURATION;
                _lto2b(last_feature, gc_cmd.start_at_feature);
                _lto2b(buffer_size, gc_cmd.data_len);
                memset(gc, 0, buffer_size);

                error = scsipi_command(periph,
                        (void *)&gc_cmd, sizeof(gc_cmd),
                        (void *) gc,     buffer_size,
                        CDRETRIES, 30000, NULL, flags);
                if (error) {
                        /* ieeek... break out of loop... i dunno what to do */
                        break;
                }

                features_len = _4btol(gc->data_len);
                if (features_len < 4 || features_len > buffer_size)
                        break;

                pos  = 0;
                fpos = &gc->feature_desc[0];
                while (pos < features_len - 4) {
                        gcf = (struct scsipi_get_conf_feature *) fpos;

                        feature     = _2btol(gcf->featurecode);
                        feature_cur = gcf->flags & 1;
                        feature_len = gcf->additional_length;

                        mmc_process_feature(mmc_discinfo,
                                            feature, feature_cur,
                                            gcf->feature_dependent);

                        last_feature = MAX(last_feature, feature);
#ifdef DIAGNOSTIC
                        /* assert((feature_len & 3) == 0); */
                        if ((feature_len & 3) != 0) {
                                printf("feature %d having length %d\n",
                                        feature, feature_len);
                        }
#endif

                        pos  += 4 + feature_len;
                        fpos += 4 + feature_len;
                }
                /* unlikely to ever grow past our 1kb buffer */
        } while (features_len >= 0xffff);

        /*
         * Fixup CD-RW drives that are on crack.
         *
         * Some drives report the capability to incrementally write
         * sequentially on CD-R(W) media...  nice, but this should not be
         * active for a fixed packet formatted CD-RW media. Other report the
         * ability of HW_DEFECTFREE even when the media is NOT MRW
         * formatted....
         */
        if (mmc_discinfo->mmc_profile == 0x0a) {
                if ((mmc_discinfo->mmc_cur & MMC_CAP_SEQUENTIAL) == 0)
                        mmc_discinfo->mmc_cur |= MMC_CAP_STRICTOVERWRITE;
                if (mmc_discinfo->mmc_cur & MMC_CAP_STRICTOVERWRITE)
                        mmc_discinfo->mmc_cur &= ~MMC_CAP_SEQUENTIAL;
                if (mmc_discinfo->mmc_cur & MMC_CAP_MRW) {
                        mmc_discinfo->mmc_cur &= ~MMC_CAP_SEQUENTIAL;
                        mmc_discinfo->mmc_cur &= ~MMC_CAP_STRICTOVERWRITE;
                } else {
                        mmc_discinfo->mmc_cur &= ~MMC_CAP_HW_DEFECTFREE;
                }
        }
        if (mmc_discinfo->mmc_profile == 0x09) {
                mmc_discinfo->mmc_cur &= ~MMC_CAP_REWRITABLE;
        }

#ifdef DEBUG
        printf("CD mmc %d, mmc_cur 0x%"PRIx64", mmc_cap 0x%"PRIx64"\n",
                mmc_discinfo->mmc_profile,
                mmc_discinfo->mmc_cur, mmc_discinfo->mmc_cap);
#endif

        /* read in disc state and number of sessions and tracks */
        flags = XS_CTL_DATA_IN | XS_CTL_SILENT;
        memset(&di_cmd, 0, sizeof(di_cmd));
        di_cmd.opcode = READ_DISCINFO;
        di_cmd.data_len[1] = READ_DISCINFO_BIGSIZE;

        error = scsipi_command(periph,
                (void *)&di_cmd, sizeof(di_cmd),
                (void *)&di,     READ_DISCINFO_BIGSIZE,
                CDRETRIES, 30000, NULL, flags);

        if (error) {
                /* discinfo call failed, emulate for cd-rom/dvd-rom */
                if (mmc_discinfo->mmc_profile == 0x08) /* CD-ROM */
                        error = mmc_getdiscinfo_cdrom(periph, mmc_discinfo);
                else if (mmc_discinfo->mmc_profile == 0x10) /* DVD-ROM */
                        error = mmc_getdiscinfo_dvdrom(periph, mmc_discinfo);
                else /* CD/DVD drive is violating specs */
                        error = EIO;
                goto out;
        }

        /* call went OK */
        mmc_discinfo->disc_state         =  di.disc_state & 3;
        mmc_discinfo->last_session_state = (di.disc_state >> 2) & 3;
        mmc_discinfo->bg_format_state    = (di.disc_state2 & 3);

        lsb = di.num_sessions_lsb;
        msb = di.num_sessions_msb;
        mmc_discinfo->num_sessions = lsb | (msb << 8);

        mmc_discinfo->first_track = di.first_track;
        lsb = di.first_track_last_session_lsb;
        msb = di.first_track_last_session_msb;
        mmc_discinfo->first_track_last_session = lsb | (msb << 8);
        lsb = di.last_track_last_session_lsb;
        msb = di.last_track_last_session_msb;
        mmc_discinfo->last_track_last_session  = lsb | (msb << 8);

        mmc_discinfo->num_tracks = mmc_discinfo->last_track_last_session -
                mmc_discinfo->first_track + 1;

        /* set misc. flags and parameters from this disc info */
        if (di.disc_state  &  16)
                mmc_discinfo->mmc_cur |= MMC_CAP_BLANKABLE;

        if (di.disc_state2 & 128) {
                mmc_discinfo->disc_id = _4btol(di.discid);
                mmc_discinfo->disc_flags |= MMC_DFLAGS_DISCIDVALID;
        }
        if (di.disc_state2 &  64) {
                mmc_discinfo->disc_barcode = _8btol(di.disc_bar_code);
                mmc_discinfo->disc_flags |= MMC_DFLAGS_BARCODEVALID;
        }
        if (di.disc_state2 &  32)
                mmc_discinfo->disc_flags |= MMC_DFLAGS_UNRESTRICTED;

        if (di.disc_state2 &  16) {
                mmc_discinfo->application_code = di.application_code;
                mmc_discinfo->disc_flags |= MMC_DFLAGS_APPCODEVALID;
        }

        /* done */

out:
        free(buffer, M_TEMP);
        return error;
}

static int
mmc_gettrackinfo_cdrom(struct scsipi_periph *periph,
                       struct mmc_trackinfo *trackinfo)
{
        struct scsipi_read_toc            gtoc_cmd;
        struct scsipi_toc_header         *toc_hdr;
        struct scsipi_toc_rawtoc         *rawtoc;
        uint32_t track_start, track_size;
        uint32_t last_recorded, next_writable;
        uint32_t lba, next_track_start, lead_out;
        const uint32_t buffer_size = 4 * 1024;  /* worst case TOC estimate */
        uint8_t *buffer;
        uint8_t track_sessionnr, sessionnr, adr, tno, point;
        uint8_t control, tmin, tsec, tframe, pmin, psec, pframe;
        int size, req_size;
        int error, flags;

        buffer = malloc(buffer_size, M_TEMP, M_WAITOK);

        /*
         * Emulate read trackinfo for CD-ROM using the raw-TOC.
         *
         * Not all information is present and this presents a problem.  Track
         * starts are known for each track but other values are deducted.
         *
         * For a complete overview of `magic' values used here, see the
         * SCSI/ATAPI MMC documentation. Note that the `magic' values have no
         * names, they are specified as numbers.
         */

        /* get raw toc to process, first header to check size */
        flags = XS_CTL_DATA_IN | XS_CTL_SILENT;
        memset(&gtoc_cmd, 0, sizeof(gtoc_cmd));
        gtoc_cmd.opcode      = READ_TOC;
        gtoc_cmd.addr_mode   = CD_MSF;          /* not relevant     */
        gtoc_cmd.resp_format = CD_TOC_RAW;      /* raw toc          */
        gtoc_cmd.from_track  = 1;               /* first session    */
        req_size = sizeof(*toc_hdr);
        _lto2b(req_size, gtoc_cmd.data_len);

        error = scsipi_command(periph,
                (void *)&gtoc_cmd, sizeof(gtoc_cmd),
                (void *)buffer,    req_size,
                CDRETRIES, 30000, NULL, flags);
        if (error)
                goto out;
        toc_hdr = (struct scsipi_toc_header *) buffer;
        if (_2btol(toc_hdr->length) > buffer_size - 2) {
#ifdef DIAGNOSTIC
                printf("increase buffersize in mmc_readtrackinfo_cdrom\n");
#endif
                error = ENOBUFS;
                goto out;
        }

        /* read in complete raw toc */
        req_size = _2btol(toc_hdr->length);
        req_size = 2*((req_size + 1) / 2);      /* for ATAPI */
        _lto2b(req_size, gtoc_cmd.data_len);

        error = scsipi_command(periph,
                (void *)&gtoc_cmd, sizeof(gtoc_cmd),
                (void *)buffer,    req_size,
                CDRETRIES, 30000, NULL, flags);
        if (error)
                goto out;

        toc_hdr = (struct scsipi_toc_header *) buffer;
        rawtoc  = (struct scsipi_toc_rawtoc *) (buffer + 4);

        track_start      = 0;
        track_size       = 0;
        last_recorded    = 0;
        next_writable    = 0;
        flags            = 0;

        next_track_start = 0;
        track_sessionnr  = MAXTRACK;    /* by definition */
        lead_out         = 0;

        size = req_size - sizeof(struct scsipi_toc_header) + 1;
        while (size > 0) {
                /* get track start and session end */
                tno       = rawtoc->tno;
                sessionnr = rawtoc->sessionnr;
                adr       = rawtoc->adrcontrol >> 4;
                control   = rawtoc->adrcontrol & 0xf;
                point     = rawtoc->point;
                tmin      = rawtoc->min;
                tsec      = rawtoc->sec;
                tframe    = rawtoc->frame;
                pmin      = rawtoc->pmin;
                psec      = rawtoc->psec;
                pframe    = rawtoc->pframe;

                if (tno == 0 && sessionnr && adr == 1) {
                        lba = hmsf2lba(0, pmin, psec, pframe);
                        if (point == trackinfo->tracknr) {
                                track_start = lba;
                                track_sessionnr = sessionnr;
                        }
                        if (point == trackinfo->tracknr + 1) {
                                /* estimate size */
                                track_size = lba - track_start;
                                next_track_start = lba;
                        }
                        if (point == 0xa2) {
                                lead_out = lba;
                        }
                        if (point <= 0x63) {
                                /* CD's ok, DVD are glued */
                                /* last_tracknr = point; */
                        }
                        if (sessionnr == track_sessionnr) {
                                last_recorded = lead_out;
                        }
                }
                if (tno == 0 && sessionnr && adr == 5) {
                        lba = hmsf2lba(0, tmin, tsec, tframe);
                        if (sessionnr == track_sessionnr) {
                                next_writable = lba;
                        }
                }

                if ((control & (3<<2)) == 4)            /* 01xxb */
                        flags |= MMC_TRACKINFO_DATA;
                if ((control & (1<<2)) == 0) {          /* x0xxb */
                        flags |= MMC_TRACKINFO_AUDIO;
                        if (control & 1)                /* xxx1b */
                                flags |= MMC_TRACKINFO_PRE_EMPH;
                }

                rawtoc++;
                size -= sizeof(struct scsipi_toc_rawtoc);
        }

        /* process found values; some voodoo */
        /* if no tracksize tracknr is the last of the disc */
        if ((track_size == 0) && last_recorded) {
                track_size = last_recorded - track_start;
        }
        /* if last_recorded < tracksize, tracksize is overestimated */
        if (last_recorded) {
                if (last_recorded - track_start <= track_size) {
                        track_size = last_recorded - track_start;
                        flags |= MMC_TRACKINFO_LRA_VALID;
                }
        }
        /* check if its a the last track of the sector */
        if (next_writable) {
                if (next_track_start > next_writable)
                        flags |= MMC_TRACKINFO_NWA_VALID;
        }

        /* no flag set -> no values */
        if ((flags & MMC_TRACKINFO_LRA_VALID) == 0)
                last_recorded = 0;
        if ((flags & MMC_TRACKINFO_NWA_VALID) == 0)
                next_writable = 0;

        /* fill in */
        /* trackinfo->tracknr preserved */
        trackinfo->sessionnr  = track_sessionnr;
        trackinfo->track_mode = 7;      /* data, incremental  */
        trackinfo->data_mode  = 8;      /* 2048 bytes mode1   */

        trackinfo->flags = flags;
        trackinfo->track_start   = track_start;
        trackinfo->next_writable = next_writable;
        trackinfo->free_blocks   = 0;
        trackinfo->packet_size   = 1;
        trackinfo->track_size    = track_size;
        trackinfo->last_recorded = last_recorded;

out:
        free(buffer, M_TEMP);
        return error;

}

static int
mmc_gettrackinfo_dvdrom(struct scsipi_periph *periph, 
                        struct mmc_trackinfo *trackinfo)
{
        struct scsipi_read_toc            gtoc_cmd;
        struct scsipi_toc_header         *toc_hdr;
        struct scsipi_toc_formatted      *toc;
        uint32_t tracknr, track_start, track_size;
        uint32_t lba, lead_out;
        const uint32_t buffer_size = 4 * 1024;  /* worst case TOC estimate */
        uint8_t *buffer;
        uint8_t control, last_tracknr;
        int size, req_size;
        int error, flags;

        
        buffer = malloc(buffer_size, M_TEMP, M_WAITOK);
        /*
         * Emulate read trackinfo for DVD-ROM. We can't use the raw-TOC as the
         * CD-ROM emulation uses since the specification tells us that no such
         * thing is defined for DVD's. The reason for this is due to the large
         * number of tracks and that would clash with the `magic' values. This
         * suxs.
         *
         * Not all information is present and this presents a problem.
         * Track starts are known for each track but other values are
         * deducted.
         */

        /* get formatted toc to process, first header to check size */
        flags = XS_CTL_DATA_IN | XS_CTL_SILENT;
        memset(&gtoc_cmd, 0, sizeof(gtoc_cmd));
        gtoc_cmd.opcode      = READ_TOC;
        gtoc_cmd.addr_mode   = 0;               /* lba's please     */
        gtoc_cmd.resp_format = CD_TOC_FORM;     /* formatted toc    */
        gtoc_cmd.from_track  = 1;               /* first track      */
        req_size = sizeof(*toc_hdr);
        _lto2b(req_size, gtoc_cmd.data_len);

        error = scsipi_command(periph,
                (void *)&gtoc_cmd, sizeof(gtoc_cmd),
                (void *)buffer,    req_size,
                CDRETRIES, 30000, NULL, flags);
        if (error)
                goto out;
        toc_hdr = (struct scsipi_toc_header *) buffer;
        if (_2btol(toc_hdr->length) > buffer_size - 2) {
#ifdef DIAGNOSTIC
                printf("increase buffersize in mmc_readtrackinfo_dvdrom\n");
#endif
                error = ENOBUFS;
                goto out;
        }

        /* read in complete formatted toc */
        req_size = _2btol(toc_hdr->length);
        _lto2b(req_size, gtoc_cmd.data_len);

        error = scsipi_command(periph,
                (void *)&gtoc_cmd, sizeof(gtoc_cmd),
                (void *)buffer,    req_size,
                CDRETRIES, 30000, NULL, flags);
        if (error)
                goto out;

        toc_hdr = (struct scsipi_toc_header *)     buffer;
        toc     = (struct scsipi_toc_formatted *) (buffer + 4);

        /* as in read disc info, all sessions are converted to tracks      */
        /* track 1..  -> offsets, sizes can be (roughly) estimated (16 ECC) */
        /* last track -> we got the size from the lead-out                 */

        tracknr      = 0;
        last_tracknr = toc_hdr->last;
        track_start  = 0;
        track_size   = 0;
        lead_out     = 0;
        flags        = 0;

        size = req_size - sizeof(struct scsipi_toc_header) + 1;
        while (size > 0) {
                /* remember, DVD-ROM: tracknr == sessionnr */
                lba     = _4btol(toc->msf_lba);
                tracknr = toc->tracknr;
                control = toc->adrcontrol & 0xf;

                if (trackinfo->tracknr == tracknr) {
                        track_start = lba;
                }
                if (trackinfo->tracknr == tracknr+1) {
                        track_size  = lba - track_start;
                        track_size -= 16;       /* link block ? */
                }
                if (tracknr == 0xAA) {
                        lead_out = lba;
                }

                if ((control & (3<<2)) == 4)            /* 01xxb */
                        flags |= MMC_TRACKINFO_DATA;
                if ((control & (1<<2)) == 0) {          /* x0xxb */
                        flags |= MMC_TRACKINFO_AUDIO;
                        if (control & (1<<3))           /* 10xxb */
                                flags |= MMC_TRACKINFO_AUDIO_4CHAN;
                        if (control & 1)                /* xxx1b */
                                flags |= MMC_TRACKINFO_PRE_EMPH;
                }

                toc++;
                size -= sizeof(struct scsipi_toc_formatted);
        }
        if (trackinfo->tracknr == last_tracknr) {
                track_size = lead_out - track_start;
        }

        /* fill in */
        /* trackinfo->tracknr preserved */
        trackinfo->sessionnr  = trackinfo->tracknr;
        trackinfo->track_mode = 0;      /* unknown */
        trackinfo->data_mode  = 8;      /* 2048 bytes mode1   */

        trackinfo->flags         = flags;
        trackinfo->track_start   = track_start;
        trackinfo->next_writable = 0;
        trackinfo->free_blocks   = 0;
        trackinfo->packet_size   = 16;  /* standard length 16 blocks ECC */
        trackinfo->track_size    = track_size;
        trackinfo->last_recorded = 0;

out:
        free(buffer, M_TEMP);
        return error;
}

static int
mmc_gettrackinfo(struct scsipi_periph *periph, 
                 struct mmc_trackinfo *trackinfo)
{
        struct scsipi_read_trackinfo      ti_cmd;
        struct scsipi_read_trackinfo_data ti __aligned(2);
        struct scsipi_get_configuration   gc_cmd;
        struct scsipi_get_conf_data       gc __aligned(2);
        int error, flags;
        int mmc_profile;

        /* set up SCSI call with track number from trackinfo.tracknr */
        flags = XS_CTL_DATA_IN | XS_CTL_SILENT;
        memset(&ti_cmd, 0, sizeof(ti_cmd));
        ti_cmd.opcode    = READ_TRACKINFO;
        ti_cmd.addr_type = READ_TRACKINFO_ADDR_TRACK;
        ti_cmd.data_len[1] = READ_TRACKINFO_RETURNSIZE;

        /* trackinfo.tracknr contains number of tracks to query */
        _lto4b(trackinfo->tracknr, ti_cmd.address);
        error = scsipi_command(periph,
                (void *)&ti_cmd, sizeof(ti_cmd),
                (void *)&ti,     READ_TRACKINFO_RETURNSIZE,
                CDRETRIES, 30000, NULL, flags);

        if (error) {
                /* trackinfo call failed, emulate for cd-rom/dvd-rom */
                /* first determine mmc profile */
                flags = XS_CTL_DATA_IN;
                memset(&gc_cmd, 0, sizeof(gc_cmd));
                gc_cmd.opcode = GET_CONFIGURATION;
                _lto2b(GET_CONF_NO_FEATURES_LEN, gc_cmd.data_len);

                error = scsipi_command(periph,
                        (void *)&gc_cmd, sizeof(gc_cmd),
                        (void *)&gc,     GET_CONF_NO_FEATURES_LEN,
                        CDRETRIES, 30000, NULL, flags);
                if (error)
                        return error;
                mmc_profile = _2btol(gc.mmc_profile);

                /* choose emulation */
                if (mmc_profile == 0x08) /* CD-ROM */
                        return mmc_gettrackinfo_cdrom(periph, trackinfo);
                if (mmc_profile == 0x10) /* DVD-ROM */
                        return mmc_gettrackinfo_dvdrom(periph, trackinfo);
                /* CD/DVD drive is violating specs */
                return EIO;
        }

        /* (re)initialise structure */
        memset(trackinfo, 0, sizeof(struct mmc_trackinfo));

        /* account for short returns screwing up track and session msb */
        if ((ti.data_len[1] | (ti.data_len[0] << 8)) <= 32) {
                ti.track_msb   = 0;
                ti.session_msb = 0;
        }

        trackinfo->tracknr    = ti.track_lsb   | (ti.track_msb   << 8);
        trackinfo->sessionnr  = ti.session_lsb | (ti.session_msb << 8);
        trackinfo->track_mode = ti.track_info_1 & 0xf;
        trackinfo->data_mode  = ti.track_info_2 & 0xf;

        flags = 0;
        if (ti.track_info_1 & 0x10)
                flags |= MMC_TRACKINFO_COPY;
        if (ti.track_info_1 & 0x20)
                flags |= MMC_TRACKINFO_DAMAGED;
        if (ti.track_info_2 & 0x10)
                flags |= MMC_TRACKINFO_FIXED_PACKET;
        if (ti.track_info_2 & 0x20)
                flags |= MMC_TRACKINFO_INCREMENTAL;
        if (ti.track_info_2 & 0x40)
                flags |= MMC_TRACKINFO_BLANK;
        if (ti.track_info_2 & 0x80)
                flags |= MMC_TRACKINFO_RESERVED;
        if (ti.data_valid   & 0x01)
                flags |= MMC_TRACKINFO_NWA_VALID;
        if (ti.data_valid   & 0x02)
                flags |= MMC_TRACKINFO_LRA_VALID;
        if ((trackinfo->track_mode & (3<<2)) == 4)              /* 01xxb */
                flags |= MMC_TRACKINFO_DATA;
        if ((trackinfo->track_mode & (1<<2)) == 0) {            /* x0xxb */
                flags |= MMC_TRACKINFO_AUDIO;
                if (trackinfo->track_mode & (1<<3))             /* 10xxb */
                        flags |= MMC_TRACKINFO_AUDIO_4CHAN;
                if (trackinfo->track_mode & 1)                  /* xxx1b */
                        flags |= MMC_TRACKINFO_PRE_EMPH;
        }

        trackinfo->flags = flags;
        trackinfo->track_start    = _4btol(ti.track_start);
        trackinfo->next_writable  = _4btol(ti.next_writable);
        trackinfo->free_blocks    = _4btol(ti.free_blocks);
        trackinfo->packet_size    = _4btol(ti.packet_size);
        trackinfo->track_size     = _4btol(ti.track_size);
        trackinfo->last_recorded  = _4btol(ti.last_recorded);

        return 0;
}

static int
mmc_doclose(struct scsipi_periph *periph, int param, int func) {
        struct scsipi_close_tracksession close_cmd;
        int error, flags;

        /* set up SCSI call with track number */
        flags = XS_CTL_DATA_OUT;
        memset(&close_cmd, 0, sizeof(close_cmd));
        close_cmd.opcode    = CLOSE_TRACKSESSION;
        close_cmd.function  = func;
        _lto2b(param, close_cmd.tracksessionnr);

        error = scsipi_command(periph,
                (void *) &close_cmd, sizeof(close_cmd),
                NULL, 0,
                CDRETRIES, 120000, NULL, flags);

        return error;
}

static int
mmc_do_closetrack(struct scsipi_periph *periph, struct mmc_op *mmc_op)
{
        int mmc_profile = mmc_op->mmc_profile;

        switch (mmc_profile) {
        case 0x12 : /* DVD-RAM */
        case 0x1a : /* DVD+RW  */
        case 0x2a : /* DVD+RW Dual layer */
        case 0x42 : /* BD-R Random Recording (RRM) */
        case 0x43 : /* BD-RE */
        case 0x52 : /* HD DVD-RW ; DVD-RAM like */
                return EINVAL;
        }

        return mmc_doclose(periph, mmc_op->tracknr, 1);
}

static int
mmc_do_close_or_finalise(struct scsipi_periph *periph, struct mmc_op *mmc_op)
{
        uint8_t blob[MS5LEN], *page5;
        int mmc_profile = mmc_op->mmc_profile;
        int func, close, flags;
        int error;

        close = (mmc_op->operation == MMC_OP_CLOSESESSION);

        switch (mmc_profile) {
        case 0x09 : /* CD-R       */
        case 0x0a : /* CD-RW      */
                /* Special case : need to update MS field in mode page 5 */
                memset(blob, 0, sizeof(blob));
                page5 = blob+8;

                flags = XS_CTL_DATA_IN;
                error = scsipi_mode_sense_big(periph, SMS_PF, 5,
                    (void *)blob, sizeof(blob), flags, CDRETRIES, 20000);
                if (error)
                        return error;

                /* set multi session field when closing a session only */
                page5[3] &= 63;
                if (close)
                        page5[3] |= 3 << 6;

                flags = XS_CTL_DATA_OUT;
                error = scsipi_mode_select_big(periph, SMS_PF,
                    (void *)blob, sizeof(blob), flags, CDRETRIES, 20000);
                if (error)
                        return error;
                /* and use function 2 */
                func = 2;
                break;
        case 0x11 : /* DVD-R (DL) */
        case 0x13 : /* DVD-RW restricted overwrite */
        case 0x14 : /* DVD-RW sequential */
                func = close ? 2 : 3;
                break;
        case 0x1b : /* DVD+R   */
        case 0x2b : /* DVD+R Dual layer */
        case 0x51 : /* HD DVD-R   */
        case 0x41 : /* BD-R Sequential recording (SRM) */
                func = close ? 2 : 6;
                break;
        case 0x12 : /* DVD-RAM */
        case 0x1a : /* DVD+RW  */
        case 0x2a : /* DVD+RW Dual layer */
        case 0x42 : /* BD-R Random Recording (RRM) */
        case 0x43 : /* BD-RE */
        case 0x52 : /* HD DVD-RW; DVD-RAM like */
                return EINVAL;
        default:
                printf("MMC close/finalise passed wrong device type! (%d)\n",
                    mmc_profile);
                return EINVAL;
        }

        return mmc_doclose(periph, mmc_op->sessionnr, func);
}

static int
mmc_do_reserve_track(struct scsipi_periph *periph, struct mmc_op *mmc_op)
{
        struct scsipi_reserve_track reserve_cmd;
        uint32_t extent;
        int error, flags;

        /* TODO make mmc safeguards? */
        extent = mmc_op->extent;
        /* TODO min/max support? */

        /* set up SCSI call with requested space */
        flags = XS_CTL_DATA_OUT;
        memset(&reserve_cmd, 0, sizeof(reserve_cmd));
        reserve_cmd.opcode = RESERVE_TRACK;
        _lto4b(extent, reserve_cmd.reservation_size);

        error = scsipi_command(periph,
                (void *) &reserve_cmd, sizeof(reserve_cmd),
                NULL, 0,
                CDRETRIES, 30000, NULL, flags);

        return error;
}

static int
mmc_do_reserve_track_nwa(struct scsipi_periph *periph, struct mmc_op *mmc_op)
{
        /* XXX assumes that NWA given is valid */
        switch (mmc_op->mmc_profile) {
        case 0x09 : /* CD-R       */
                /* XXX unknown boundary checks XXX */
                if (mmc_op->extent <= 152)
                        return EINVAL;
                /* CD-R takes 152 sectors to close track */
                mmc_op->extent -= 152;
                return mmc_do_reserve_track(periph, mmc_op);
        case 0x11 : /* DVD-R (DL) */
        case 0x1b : /* DVD+R   */
        case 0x2b : /* DVD+R Dual layer */
                if (mmc_op->extent % 16)
                        return EINVAL;
                /* upto one ECC block of 16 sectors lost */
                mmc_op->extent -= 16;
                return mmc_do_reserve_track(periph, mmc_op);
        case 0x41 : /* BD-R Sequential recording (SRM) */
        case 0x51 : /* HD DVD-R   */
                if (mmc_op->extent % 32)
                        return EINVAL;
                /* one ECC block of 32 sectors lost (AFAIK) */
                mmc_op->extent -= 32;
                return mmc_do_reserve_track(periph, mmc_op);
        }

        /* unknown behaviour or invalid disc type */
        return EINVAL;
}

static int
mmc_do_repair_track(struct scsipi_periph *periph, struct mmc_op *mmc_op)
{
        struct scsipi_repair_track repair_cmd;
        int error, flags;

        /* TODO make mmc safeguards? */

        /* set up SCSI call with track number */
        flags = XS_CTL_DATA_OUT;
        memset(&repair_cmd, 0, sizeof(repair_cmd));
        repair_cmd.opcode = REPAIR_TRACK;
        _lto2b(mmc_op->tracknr, repair_cmd.tracknr);

        error = scsipi_command(periph,
                (void *) &repair_cmd, sizeof(repair_cmd),
                NULL, 0,
                CDRETRIES, 30000, NULL, flags);

        return error;
}

static int
mmc_do_op(struct scsipi_periph *periph, struct mmc_op *mmc_op)
{
        /* guard operation value */
        if (mmc_op->operation < 1 || mmc_op->operation > MMC_OP_MAX)
                return EINVAL;

        /* synchronise cache is special since it doesn't rely on mmc_profile */
        if (mmc_op->operation == MMC_OP_SYNCHRONISECACHE)
                return cdcachesync(periph, 0);

        /* zero mmc_profile means unknown disc so operations are not defined */
        if (mmc_op->mmc_profile == 0) {
#ifdef DEBUG
                printf("mmc_do_op called with mmc_profile = 0\n");
#endif
                return EINVAL;
        }

        /* do the operations */
        switch (mmc_op->operation) {
        case MMC_OP_CLOSETRACK   :
                return mmc_do_closetrack(periph, mmc_op);
        case MMC_OP_CLOSESESSION :
        case MMC_OP_FINALISEDISC :
                return mmc_do_close_or_finalise(periph, mmc_op);
        case MMC_OP_RESERVETRACK :
                return mmc_do_reserve_track(periph, mmc_op);
        case MMC_OP_RESERVETRACK_NWA :
                return mmc_do_reserve_track_nwa(periph, mmc_op);
        case MMC_OP_REPAIRTRACK  :
                return mmc_do_repair_track(periph, mmc_op);
        case MMC_OP_UNCLOSELASTSESSION :
                /* TODO unclose last session support */
                return EINVAL;
        default :
                printf("mmc_do_op: unhandled operation %d\n", mmc_op->operation);
        }

        return EINVAL;
}

static int
mmc_setup_writeparams(struct scsipi_periph *periph,
                      struct mmc_writeparams *mmc_writeparams)
{
        struct mmc_trackinfo trackinfo;
        uint8_t blob[MS5LEN];
        uint8_t *page5;
        int flags, error;
        int track_mode, data_mode;

        /* setup mode page 5 for CD only */
        if (mmc_writeparams->mmc_class != MMC_CLASS_CD)
                return 0;

        memset(blob, 0, sizeof(blob));
        page5 = blob+8;

        /* read mode page 5 (with header) */
        flags = XS_CTL_DATA_IN;
        error = scsipi_mode_sense_big(periph, SMS_PF, 5, (void *)blob,
            sizeof(blob), flags, CDRETRIES, 20000);
        if (error)
                return error;

        /* set page length for reassurance */
        page5[1] = P5LEN;       /* page length */

        /* write type packet/incremental */
        page5[2] &= 0xf0;

        /* set specified mode parameters */
        track_mode = mmc_writeparams->track_mode;
        data_mode  = mmc_writeparams->data_mode;
        if (track_mode <= 0 || track_mode > 15)
                return EINVAL;
        if (data_mode < 1 || data_mode > 2)
                return EINVAL;

        /* if a tracknr is passed, setup according to the track */
        if (mmc_writeparams->tracknr > 0) {
                trackinfo.tracknr = mmc_writeparams->tracknr;
                error = mmc_gettrackinfo(periph, &trackinfo);
                if (error)
                        return error;
                if ((trackinfo.flags & MMC_TRACKINFO_BLANK) == 0) {
                        track_mode = trackinfo.track_mode;
                        data_mode  = trackinfo.data_mode;
                }
                mmc_writeparams->blockingnr = trackinfo.packet_size;
        }

        /* copy track mode and data mode from trackinfo */
        page5[3] &= 16;         /* keep only `Copy' bit */
        page5[3] |= (3 << 6) | track_mode;
        page5[4] &= 0xf0;       /* wipe data block type */
        if (data_mode == 1) {
                /* select ISO mode 1 (CD only) */
                page5[4] |= 8;
                /* select session format normal disc (CD only) */
                page5[8] = 0;
        } else {
                /* select ISO mode 2; XA form 1 (CD only) */
                page5[4] |= 10;
                /* select session format CD-ROM XA disc (CD only) */
                page5[8] = 0x20;
        }
        if (mmc_writeparams->mmc_cur & MMC_CAP_SEQUENTIAL) {
                if (mmc_writeparams->mmc_cur & MMC_CAP_ZEROLINKBLK) {
                        /* set BUFE buffer underrun protection */
                        page5[2] |= 1<<6;
                }
                /* allow for multi session */
                page5[3] |= 3 << 6;
        } else {
                /* select fixed packets */
                page5[3] |= 1<<5;
                _lto4b(mmc_writeparams->blockingnr, &(page5[10]));
        }

        /* write out updated mode page 5 (with header) */
        flags = XS_CTL_DATA_OUT;
        error = scsipi_mode_select_big(periph, SMS_PF, (void *)blob,
            sizeof(blob), flags, CDRETRIES, 20000);
        if (error)
                return error;

        return 0;
}

static void
cd_set_geometry(struct cd_softc *cd)
{
        struct dk_softc *dksc = &cd->sc_dksc;
        struct disk_geom *dg = &dksc->sc_dkdev.dk_geom;

        memset(dg, 0, sizeof(*dg));

        dg->dg_secperunit = cd->params.disksize;
        dg->dg_secsize = cd->params.blksize;
        dg->dg_nsectors = 100;
        dg->dg_ntracks = 1;

        disk_set_info(dksc->sc_dev, &dksc->sc_dkdev, NULL);
}