No empty .Rs/.Re

[netbsd-mini2440.git] / sys / arch / hp300 / dev / rd.c

/*      $NetBSD: rd.c,v 1.88 2008/06/17 21:08:08 he Exp $       */

/*-
 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 */

/*
 * Copyright (c) 1982, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 * from: Utah $Hdr: rd.c 1.44 92/12/26$
 *
 *      @(#)rd.c        8.2 (Berkeley) 5/19/94
 */
/*
 * Copyright (c) 1988 University of Utah.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 * from: Utah $Hdr: rd.c 1.44 92/12/26$
 *
 *      @(#)rd.c        8.2 (Berkeley) 5/19/94
 */

/*
 * CS80/SS80 disk driver
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rd.c,v 1.88 2008/06/17 21:08:08 he Exp $");

#include "opt_useleds.h"
#include "rnd.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/stat.h>

#if NRND > 0
#include <sys/rnd.h>
#endif

#include <hp300/dev/hpibvar.h>

#include <hp300/dev/rdreg.h>
#include <hp300/dev/rdvar.h>

#ifdef USELEDS
#include <hp300/hp300/leds.h>
#endif

#include "ioconf.h"

int     rderrthresh = RDRETRY-1;        /* when to start reporting errors */

#ifdef DEBUG
/* error message tables */
static const char *err_reject[] = {
        0, 0,
        "channel parity error",         /* 0x2000 */
        0, 0,
        "illegal opcode",               /* 0x0400 */
        "module addressing",            /* 0x0200 */
        "address bounds",               /* 0x0100 */
        "parameter bounds",             /* 0x0080 */
        "illegal parameter",            /* 0x0040 */
        "message sequence",             /* 0x0020 */
        0,
        "message length",               /* 0x0008 */
        0, 0, 0
};

static const char *err_fault[] = {
        0,
        "cross unit",                   /* 0x4000 */
        0,
        "controller fault",             /* 0x1000 */
        0, 0,
        "unit fault",                   /* 0x0200 */
        0,
        "diagnostic result",            /* 0x0080 */
        0,
        "operator release request",     /* 0x0020 */
        "diagnostic release request",   /* 0x0010 */
        "internal maintenance release request", /* 0x0008 */
        0,
        "power fail",                   /* 0x0002 */
        "retransmit"                    /* 0x0001 */
};

static const char *err_access[] = {
        "illegal parallel operation",   /* 0x8000 */
        "uninitialized media",          /* 0x4000 */
        "no spares available",          /* 0x2000 */
        "not ready",                    /* 0x1000 */
        "write protect",                /* 0x0800 */
        "no data found",                /* 0x0400 */
        0, 0,
        "unrecoverable data overflow",  /* 0x0080 */
        "unrecoverable data",           /* 0x0040 */
        0,
        "end of file",                  /* 0x0010 */
        "end of volume",                /* 0x0008 */
        0, 0, 0
};

static const char *err_info[] = {
        "operator release request",     /* 0x8000 */
        "diagnostic release request",   /* 0x4000 */
        "internal maintenance release request", /* 0x2000 */
        "media wear",                   /* 0x1000 */
        "latency induced",              /* 0x0800 */
        0, 0,
        "auto sparing invoked",         /* 0x0100 */
        0,
        "recoverable data overflow",    /* 0x0040 */
        "marginal data",                /* 0x0020 */
        "recoverable data",             /* 0x0010 */
        0,
        "maintenance track overflow",   /* 0x0004 */
        0, 0
};

int     rddebug = 0x80;
#define RDB_FOLLOW      0x01
#define RDB_STATUS      0x02
#define RDB_IDENT       0x04
#define RDB_IO          0x08
#define RDB_ASYNC       0x10
#define RDB_ERROR       0x80
#endif

/*
 * Misc. HW description, indexed by sc_type.
 * Nothing really critical here, could do without it.
 */
static const struct rdidentinfo rdidentinfo[] = {
        { RD7946AID,    0,      "7945A",        NRD7945ABPT,
          NRD7945ATRK,  968,     108416 },

        { RD9134DID,    1,      "9134D",        NRD9134DBPT,
          NRD9134DTRK,  303,      29088 },

        { RD9134LID,    1,      "9122S",        NRD9122SBPT,
          NRD9122STRK,  77,        1232 },

        { RD7912PID,    0,      "7912P",        NRD7912PBPT,
          NRD7912PTRK,  572,     128128 },

        { RD7914PID,    0,      "7914P",        NRD7914PBPT,
          NRD7914PTRK,  1152,    258048 },

        { RD7958AID,    0,      "7958A",        NRD7958ABPT,
          NRD7958ATRK,  1013,    255276 },

        { RD7957AID,    0,      "7957A",        NRD7957ABPT,
          NRD7957ATRK,  1036,    159544 },

        { RD7933HID,    0,      "7933H",        NRD7933HBPT,
          NRD7933HTRK,  1321,    789958 },

        { RD9134LID,    1,      "9134L",        NRD9134LBPT,
          NRD9134LTRK,  973,      77840 },

        { RD7936HID,    0,      "7936H",        NRD7936HBPT,
          NRD7936HTRK,  698,     600978 },

        { RD7937HID,    0,      "7937H",        NRD7937HBPT,
          NRD7937HTRK,  698,    1116102 },

        { RD7914CTID,   0,      "7914CT",       NRD7914PBPT,
          NRD7914PTRK,  1152,    258048 },

        { RD7946AID,    0,      "7946A",        NRD7945ABPT,
          NRD7945ATRK,  968,     108416 },

        { RD9134LID,    1,      "9122D",        NRD9122SBPT,
          NRD9122STRK,  77,        1232 },

        { RD7957BID,    0,      "7957B",        NRD7957BBPT,
          NRD7957BTRK,  1269,    159894 },

        { RD7958BID,    0,      "7958B",        NRD7958BBPT,
          NRD7958BTRK,  786,     297108 },

        { RD7959BID,    0,      "7959B",        NRD7959BBPT,
          NRD7959BTRK,  1572,    594216 },

        { RD2200AID,    0,      "2200A",        NRD2200ABPT,
          NRD2200ATRK,  1449,    654948 },

        { RD2203AID,    0,      "2203A",        NRD2203ABPT,
          NRD2203ATRK,  1449,   1309896 }
};
static const int numrdidentinfo = __arraycount(rdidentinfo);

static int      rdident(struct device *, struct rd_softc *,
                    struct hpibbus_attach_args *);
static void     rdreset(struct rd_softc *);
static void     rdustart(struct rd_softc *);
static int      rdgetinfo(dev_t);
static void     rdrestart(void *);
static struct buf *rdfinish(struct rd_softc *, struct buf *);

static void     rdgetdefaultlabel(struct rd_softc *, struct disklabel *);
static void     rdrestart(void *);
static void     rdustart(struct rd_softc *);
static struct buf *rdfinish(struct rd_softc *, struct buf *);
static void     rdstart(void *);
static void     rdgo(void *);
static void     rdintr(void *);
static int      rdstatus(struct rd_softc *);
static int      rderror(int);
#ifdef DEBUG
static void     rdprinterr(const char *, short, const char **);
#endif

static int      rdmatch(device_t, cfdata_t, void *);
static void     rdattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(rd, sizeof(struct rd_softc),
    rdmatch, rdattach, NULL, NULL);

static dev_type_open(rdopen);
static dev_type_close(rdclose);
static dev_type_read(rdread);
static dev_type_write(rdwrite);
static dev_type_ioctl(rdioctl);
static dev_type_strategy(rdstrategy);
static dev_type_dump(rddump);
static dev_type_size(rdsize);

const struct bdevsw rd_bdevsw = {
        rdopen, rdclose, rdstrategy, rdioctl, rddump, rdsize, D_DISK
};

const struct cdevsw rd_cdevsw = {
        rdopen, rdclose, rdread, rdwrite, rdioctl,
        nostop, notty, nopoll, nommap, nokqfilter, D_DISK
};

static int
rdmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct hpibbus_attach_args *ha = aux;

        /*
         * Set punit if operator specified one in the kernel
         * configuration file.
         */
        if (cf->hpibbuscf_punit != HPIBBUSCF_PUNIT_DEFAULT &&
            cf->hpibbuscf_punit < HPIB_NPUNITS)
                ha->ha_punit = cf->hpibbuscf_punit;

        if (rdident(parent, NULL, ha) == 0) {
                /*
                 * XXX Some aging HP-IB drives are slow to
                 * XXX respond; give them a chance to catch
                 * XXX up and probe them again.
                 */
                delay(10000);
                ha->ha_id = hpibid(device_unit(parent), ha->ha_slave);
                return rdident(parent, NULL, ha);
        }
        return 1;
}

static void
rdattach(device_t parent, device_t self, void *aux)
{
        struct rd_softc *sc = device_private(self);
        struct hpibbus_attach_args *ha = aux;

        sc->sc_dev = self;
        bufq_alloc(&sc->sc_tab, "disksort", BUFQ_SORT_RAWBLOCK);

        if (rdident(parent, sc, ha) == 0) {
                aprint_error(": didn't respond to describe command!\n");
                return;
        }

        /*
         * Initialize and attach the disk structure.
         */
        memset(&sc->sc_dkdev, 0, sizeof(sc->sc_dkdev));
        disk_init(&sc->sc_dkdev, device_xname(sc->sc_dev), NULL);
        disk_attach(&sc->sc_dkdev);

        sc->sc_slave = ha->ha_slave;
        sc->sc_punit = ha->ha_punit;

        callout_init(&sc->sc_restart_ch, 0);

        /* Initialize the hpib job queue entry */
        sc->sc_hq.hq_softc = sc;
        sc->sc_hq.hq_slave = sc->sc_slave;
        sc->sc_hq.hq_start = rdstart;
        sc->sc_hq.hq_go = rdgo;
        sc->sc_hq.hq_intr = rdintr;

        sc->sc_flags = RDF_ALIVE;
#ifdef DEBUG
        /* always report errors */
        if (rddebug & RDB_ERROR)
                rderrthresh = 0;
#endif
#if NRND > 0
        /*
         * attach the device into the random source list
         */
        rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
            RND_TYPE_DISK, 0);
#endif
}

static int
rdident(device_t parent, struct rd_softc *sc, struct hpibbus_attach_args *ha)
{
        struct rd_describe *desc = sc != NULL ? &sc->sc_rddesc : NULL;
        u_char stat, cmd[3];
        char name[7];
        int i, id, n, ctlr, slave;

        ctlr = device_unit(parent);
        slave = ha->ha_slave;

        /* Verify that we have a CS80 device. */
        if ((ha->ha_id & 0x200) == 0)
                return 0;

        /* Is it one of the disks we support? */
        for (id = 0; id < numrdidentinfo; id++)
                if (ha->ha_id == rdidentinfo[id].ri_hwid)
                        break;
        if (id == numrdidentinfo || ha->ha_punit > rdidentinfo[id].ri_maxunum)
                return 0;

        /*
         * If we're just probing for the device, that's all the
         * work we need to do.
         */
        if (sc == NULL)
                return 1;

        /*
         * Reset device and collect description
         */
        rdreset(sc);
        cmd[0] = C_SUNIT(ha->ha_punit);
        cmd[1] = C_SVOL(0);
        cmd[2] = C_DESC;
        hpibsend(ctlr, slave, C_CMD, cmd, sizeof(cmd));
        hpibrecv(ctlr, slave, C_EXEC, desc, 37);
        hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
        memset(name, 0, sizeof(name));
        if (stat == 0) {
                n = desc->d_name;
                for (i = 5; i >= 0; i--) {
                        name[i] = (n & 0xf) + '0';
                        n >>= 4;
                }
        }

#ifdef DEBUG
        if (rddebug & RDB_IDENT) {
                aprint_debug("\n");
                aprint_debug_dev(sc->sc_dev, "name: %x ('%s')\n",
                    desc->d_name, name);
                aprint_debug("  iuw %x, maxxfr %d, ctype %d\n",
                    desc->d_iuw, desc->d_cmaxxfr, desc->d_ctype);
                aprint_debug("  utype %d, bps %d, blkbuf %d, burst %d,"
                    " blktime %d\n",
                    desc->d_utype, desc->d_sectsize,
                    desc->d_blkbuf, desc->d_burstsize, desc->d_blocktime);
                aprint_debug("  avxfr %d, ort %d, atp %d, maxint %d, fv %x"
                    ", rv %x\n",
                    desc->d_uavexfr, desc->d_retry, desc->d_access,
                    desc->d_maxint, desc->d_fvbyte, desc->d_rvbyte);
                aprint_debug("  maxcyl/head/sect %d/%d/%d, maxvsect %d,"
                    " inter %d\n",
                    desc->d_maxcyl, desc->d_maxhead, desc->d_maxsect,
                    desc->d_maxvsectl, desc->d_interleave);
                aprint_normal("%s", device_xname(sc->sc_dev));
        }
#endif

        /*
         * Take care of a couple of anomolies:
         * 1. 7945A and 7946A both return same HW id
         * 2. 9122S and 9134D both return same HW id
         * 3. 9122D and 9134L both return same HW id
         */
        switch (ha->ha_id) {
        case RD7946AID:
                if (memcmp(name, "079450", 6) == 0)
                        id = RD7945A;
                else
                        id = RD7946A;
                break;

        case RD9134LID:
                if (memcmp(name, "091340", 6) == 0)
                        id = RD9134L;
                else
                        id = RD9122D;
                break;

        case RD9134DID:
                if (memcmp(name, "091220", 6) == 0)
                        id = RD9122S;
                else
                        id = RD9134D;
                break;
        }

        sc->sc_type = id;

        /*
         * XXX We use DEV_BSIZE instead of the sector size value pulled
         * XXX off the driver because all of this code assumes 512 byte
         * XXX blocks.  ICK!
         */
        aprint_normal(": %s\n", rdidentinfo[id].ri_desc);
        aprint_normal_dev(sc->sc_dev, "%d cylinders, %d heads, %d blocks,"
            " %d bytes/block\n",
            rdidentinfo[id].ri_ncyl,
            rdidentinfo[id].ri_ntpc, rdidentinfo[id].ri_nblocks,
            DEV_BSIZE);

        return 1;
}

static void
rdreset(struct rd_softc *sc)
{
        int ctlr = device_unit(device_parent(sc->sc_dev));
        int slave = sc->sc_slave;
        u_char stat;

        sc->sc_clear.c_unit = C_SUNIT(sc->sc_punit);
        sc->sc_clear.c_cmd = C_CLEAR;
        hpibsend(ctlr, slave, C_TCMD, &sc->sc_clear, sizeof(sc->sc_clear));
        hpibswait(ctlr, slave);
        hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));

        sc->sc_src.c_unit = C_SUNIT(RDCTLR);
        sc->sc_src.c_nop = C_NOP;
        sc->sc_src.c_cmd = C_SREL;
        sc->sc_src.c_param = C_REL;
        hpibsend(ctlr, slave, C_CMD, &sc->sc_src, sizeof(sc->sc_src));
        hpibswait(ctlr, slave);
        hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));

        sc->sc_ssmc.c_unit = C_SUNIT(sc->sc_punit);
        sc->sc_ssmc.c_cmd = C_SSM;
        sc->sc_ssmc.c_refm = REF_MASK;
        sc->sc_ssmc.c_fefm = FEF_MASK;
        sc->sc_ssmc.c_aefm = AEF_MASK;
        sc->sc_ssmc.c_iefm = IEF_MASK;
        hpibsend(ctlr, slave, C_CMD, &sc->sc_ssmc, sizeof(sc->sc_ssmc));
        hpibswait(ctlr, slave);
        hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
#ifdef DEBUG
        sc->sc_stats.rdresets++;
#endif
}

/*
 * Read or construct a disklabel
 */
static int
rdgetinfo(dev_t dev)
{
        struct rd_softc *sc = device_lookup_private(&rd_cd, rdunit(dev));
        struct disklabel *lp = sc->sc_dkdev.dk_label;
        struct partition *pi;
        const char *msg;

        /*
         * Set some default values to use while reading the label
         * or to use if there isn't a label.
         */
        memset((void *)lp, 0, sizeof *lp);
        rdgetdefaultlabel(sc, lp);

        /*
         * Now try to read the disklabel
         */
        msg = readdisklabel(rdlabdev(dev), rdstrategy, lp, NULL);
        if (msg == NULL)
                return 0;

        pi = lp->d_partitions;
        printf("%s: WARNING: %s\n", device_xname(sc->sc_dev), msg);

        pi[2].p_size = rdidentinfo[sc->sc_type].ri_nblocks;
        /* XXX reset other info since readdisklabel screws with it */
        lp->d_npartitions = 3;
        pi[0].p_size = 0;

        return 0;
}

static int
rdopen(dev_t dev, int flags, int mode, struct lwp *l)
{
        struct rd_softc *sc;
        int error, mask, part;

        sc = device_lookup_private(&rd_cd, rdunit(dev));
        if (sc == NULL)
                return ENXIO;

        if ((sc->sc_flags & RDF_ALIVE) == 0)
                return ENXIO;

        /*
         * Wait for any pending opens/closes to complete
         */
        while (sc->sc_flags & (RDF_OPENING|RDF_CLOSING))
                (void) tsleep(sc, PRIBIO, "rdopen", 0);

        /*
         * On first open, get label and partition info.
         * We may block reading the label, so be careful
         * to stop any other opens.
         */
        if (sc->sc_dkdev.dk_openmask == 0) {
                sc->sc_flags |= RDF_OPENING;
                error = rdgetinfo(dev);
                sc->sc_flags &= ~RDF_OPENING;
                wakeup((void *)sc);
                if (error)
                        return error;
        }

        part = rdpart(dev);
        mask = 1 << part;

        /* Check that the partition exists. */
        if (part != RAW_PART &&
            (part > sc->sc_dkdev.dk_label->d_npartitions ||
             sc->sc_dkdev.dk_label->d_partitions[part].p_fstype == FS_UNUSED))
                return ENXIO;

        /* Ensure only one open at a time. */
        switch (mode) {
        case S_IFCHR:
                sc->sc_dkdev.dk_copenmask |= mask;
                break;
        case S_IFBLK:
                sc->sc_dkdev.dk_bopenmask |= mask;
                break;
        }
        sc->sc_dkdev.dk_openmask =
            sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask;

        return 0;
}

static int
rdclose(dev_t dev, int flag, int mode, struct lwp *l)
{
        struct rd_softc *sc = device_lookup_private(&rd_cd, rdunit(dev));
        struct disk *dk = &sc->sc_dkdev;
        int mask, s;

        mask = 1 << rdpart(dev);
        if (mode == S_IFCHR)
                dk->dk_copenmask &= ~mask;
        else
                dk->dk_bopenmask &= ~mask;
        dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask;
        /*
         * On last close, we wait for all activity to cease since
         * the label/parition info will become invalid.  Since we
         * might sleep, we must block any opens while we are here.
         * Note we don't have to about other closes since we know
         * we are the last one.
         */
        if (dk->dk_openmask == 0) {
                sc->sc_flags |= RDF_CLOSING;
                s = splbio();
                while (sc->sc_active) {
                        sc->sc_flags |= RDF_WANTED;
                        (void) tsleep(&sc->sc_tab, PRIBIO, "rdclose", 0);
                }
                splx(s);
                sc->sc_flags &= ~(RDF_CLOSING|RDF_WLABEL);
                wakeup((void *)sc);
        }
        return 0;
}

static void
rdstrategy(struct buf *bp)
{
        struct rd_softc *sc = device_lookup_private(&rd_cd, rdunit(bp->b_dev));
        struct partition *pinfo;
        daddr_t bn;
        int sz, s;
        int offset;

#ifdef DEBUG
        if (rddebug & RDB_FOLLOW)
                printf("rdstrategy(%p): dev %x, bn %llx, bcount %x, %c\n",
                       bp, bp->b_dev, bp->b_blkno, bp->b_bcount,
                       (bp->b_flags & B_READ) ? 'R' : 'W');
#endif
        bn = bp->b_blkno;
        sz = howmany(bp->b_bcount, DEV_BSIZE);
        pinfo = &sc->sc_dkdev.dk_label->d_partitions[rdpart(bp->b_dev)];

        /* Don't perform partition translation on RAW_PART. */
        offset = (rdpart(bp->b_dev) == RAW_PART) ? 0 : pinfo->p_offset;

        if (rdpart(bp->b_dev) != RAW_PART) {
                /*
                 * XXX This block of code belongs in
                 * XXX bounds_check_with_label()
                 */

                if (bn < 0 || bn + sz > pinfo->p_size) {
                        sz = pinfo->p_size - bn;
                        if (sz == 0) {
                                bp->b_resid = bp->b_bcount;
                                goto done;
                        }
                        if (sz < 0) {
                                bp->b_error = EINVAL;
                                goto done;
                        }
                        bp->b_bcount = dbtob(sz);
                }
                /*
                 * Check for write to write protected label
                 */
                if (bn + offset <= LABELSECTOR &&
#if LABELSECTOR != 0
                    bn + offset + sz > LABELSECTOR &&
#endif
                    !(bp->b_flags & B_READ) && !(sc->sc_flags & RDF_WLABEL)) {
                        bp->b_error = EROFS;
                        goto done;
                }
        }
        bp->b_rawblkno = bn + offset;
        s = splbio();
        bufq_put(sc->sc_tab, bp);
        if (sc->sc_active == 0) {
                sc->sc_active = 1;
                rdustart(sc);
        }
        splx(s);
        return;
done:
        biodone(bp);
}

/*
 * Called from timeout() when handling maintenance releases
 */
static void
rdrestart(void *arg)
{
        int s = splbio();
        rdustart((struct rd_softc *)arg);
        splx(s);
}

static void
rdustart(struct rd_softc *sc)
{
        struct buf *bp;

        bp = bufq_peek(sc->sc_tab);
        sc->sc_addr = bp->b_data;
        sc->sc_resid = bp->b_bcount;
        if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq))
                rdstart(sc);
}

static struct buf *
rdfinish(struct rd_softc *sc, struct buf *bp)
{

        sc->sc_errcnt = 0;
        (void)bufq_get(sc->sc_tab);
        bp->b_resid = 0;
        biodone(bp);
        hpibfree(device_parent(sc->sc_dev), &sc->sc_hq);
        if ((bp = bufq_peek(sc->sc_tab)) != NULL)
                return bp;
        sc->sc_active = 0;
        if (sc->sc_flags & RDF_WANTED) {
                sc->sc_flags &= ~RDF_WANTED;
                wakeup((void *)&sc->sc_tab);
        }
        return NULL;
}

static void
rdstart(void *arg)
{
        struct rd_softc *sc = arg;
        struct buf *bp = bufq_peek(sc->sc_tab);
        int part, ctlr, slave;

        ctlr = device_unit(device_parent(sc->sc_dev));
        slave = sc->sc_slave;

again:
#ifdef DEBUG
        if (rddebug & RDB_FOLLOW)
                printf("rdstart(%s): bp %p, %c\n", device_xname(sc->sc_dev), bp,
                    (bp->b_flags & B_READ) ? 'R' : 'W');
#endif
        part = rdpart(bp->b_dev);
        sc->sc_flags |= RDF_SEEK;
        sc->sc_ioc.c_unit = C_SUNIT(sc->sc_punit);
        sc->sc_ioc.c_volume = C_SVOL(0);
        sc->sc_ioc.c_saddr = C_SADDR;
        sc->sc_ioc.c_hiaddr = 0;
        sc->sc_ioc.c_addr = RDBTOS(bp->b_rawblkno);
        sc->sc_ioc.c_nop2 = C_NOP;
        sc->sc_ioc.c_slen = C_SLEN;
        sc->sc_ioc.c_len = sc->sc_resid;
        sc->sc_ioc.c_cmd = bp->b_flags & B_READ ? C_READ : C_WRITE;
#ifdef DEBUG
        if (rddebug & RDB_IO)
                printf("rdstart: hpibsend(%x, %x, %x, %p, %x)\n",
                       ctlr, slave, C_CMD,
                       &sc->sc_ioc.c_unit, sizeof(sc->sc_ioc) - 2);
#endif
        if (hpibsend(ctlr, slave, C_CMD, &sc->sc_ioc.c_unit,
                     sizeof(sc->sc_ioc) - 2) == sizeof(sc->sc_ioc) - 2) {

                /* Instrumentation. */
                disk_busy(&sc->sc_dkdev);
                iostat_seek(sc->sc_dkdev.dk_stats);

#ifdef DEBUG
                if (rddebug & RDB_IO)
                        printf("rdstart: hpibawait(%x)\n", ctlr);
#endif
                hpibawait(ctlr);
                return;
        }
        /*
         * Experience has shown that the hpibwait in this hpibsend will
         * occasionally timeout.  It appears to occur mostly on old 7914
         * drives with full maintenance tracks.  We should probably
         * integrate this with the backoff code in rderror.
         */
#ifdef DEBUG
        if (rddebug & RDB_ERROR)
                printf("%s: rdstart: cmd %x adr %lx blk %lld len %d ecnt %d\n",
                    device_xname(sc->sc_dev),
                    sc->sc_ioc.c_cmd, sc->sc_ioc.c_addr,
                    bp->b_blkno, sc->sc_resid, sc->sc_errcnt);
        sc->sc_stats.rdretries++;
#endif
        sc->sc_flags &= ~RDF_SEEK;
        rdreset(sc);
        if (sc->sc_errcnt++ < RDRETRY)
                goto again;
        printf("%s: rdstart err: cmd 0x%x sect %ld blk %" PRId64 " len %d\n",
            device_xname(sc->sc_dev), sc->sc_ioc.c_cmd, sc->sc_ioc.c_addr,
            bp->b_blkno, sc->sc_resid);
        bp->b_error = EIO;
        bp = rdfinish(sc, bp);
        if (bp) {
                sc->sc_addr = bp->b_data;
                sc->sc_resid = bp->b_bcount;
                if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq))
                        goto again;
        }
}

static void
rdgo(void *arg)
{
        struct rd_softc *sc = arg;
        struct buf *bp = bufq_peek(sc->sc_tab);
        int rw, ctlr, slave;

        ctlr = device_unit(device_parent(sc->sc_dev));
        slave = sc->sc_slave;

        rw = bp->b_flags & B_READ;

        /* Instrumentation. */
        disk_busy(&sc->sc_dkdev);

#ifdef USELEDS
        ledcontrol(0, 0, LED_DISK);
#endif
        hpibgo(ctlr, slave, C_EXEC, sc->sc_addr, sc->sc_resid, rw, rw != 0);
}

/* ARGSUSED */
static void
rdintr(void *arg)
{
        struct rd_softc *sc = arg;
        int unit = device_unit(sc->sc_dev);
        struct buf *bp = bufq_peek(sc->sc_tab);
        u_char stat = 13;       /* in case hpibrecv fails */
        int rv, restart, ctlr, slave;

        ctlr = device_unit(device_parent(sc->sc_dev));
        slave = sc->sc_slave;

#ifdef DEBUG
        if (rddebug & RDB_FOLLOW)
                printf("rdintr(%d): bp %p, %c, flags %x\n", unit, bp,
                    (bp->b_flags & B_READ) ? 'R' : 'W', sc->sc_flags);
        if (bp == NULL) {
                printf("%s: bp == NULL\n", device_xname(sc->sc_dev));
                return;
        }
#endif
        disk_unbusy(&sc->sc_dkdev, (bp->b_bcount - bp->b_resid),
            (bp->b_flags & B_READ));

        if (sc->sc_flags & RDF_SEEK) {
                sc->sc_flags &= ~RDF_SEEK;
                if (hpibustart(ctlr))
                        rdgo(sc);
                return;
        }
        if ((sc->sc_flags & RDF_SWAIT) == 0) {
#ifdef DEBUG
                sc->sc_stats.rdpolltries++;
#endif
                if (hpibpptest(ctlr, slave) == 0) {
#ifdef DEBUG
                        sc->sc_stats.rdpollwaits++;
#endif

                        /* Instrumentation. */
                        disk_busy(&sc->sc_dkdev);
                        sc->sc_flags |= RDF_SWAIT;
                        hpibawait(ctlr);
                        return;
                }
        } else
                sc->sc_flags &= ~RDF_SWAIT;
        rv = hpibrecv(ctlr, slave, C_QSTAT, &stat, 1);
        if (rv != 1 || stat) {
#ifdef DEBUG
                if (rddebug & RDB_ERROR)
                        printf("rdintr: recv failed or bad stat %d\n", stat);
#endif
                restart = rderror(unit);
#ifdef DEBUG
                sc->sc_stats.rdretries++;
#endif
                if (sc->sc_errcnt++ < RDRETRY) {
                        if (restart)
                                rdstart(sc);
                        return;
                }
                bp->b_error = EIO;
        }
        if (rdfinish(sc, bp))
                rdustart(sc);
#if NRND > 0
        rnd_add_uint32(&sc->rnd_source, bp->b_blkno);
#endif
}

static int
rdstatus(struct rd_softc *sc)
{
        int c, s;
        u_char stat;
        int rv;

        c = device_unit(device_parent(sc->sc_dev));
        s = sc->sc_slave;
        sc->sc_rsc.c_unit = C_SUNIT(sc->sc_punit);
        sc->sc_rsc.c_sram = C_SRAM;
        sc->sc_rsc.c_ram = C_RAM;
        sc->sc_rsc.c_cmd = C_STATUS;
        memset((void *)&sc->sc_stat, 0, sizeof(sc->sc_stat));
        rv = hpibsend(c, s, C_CMD, &sc->sc_rsc, sizeof(sc->sc_rsc));
        if (rv != sizeof(sc->sc_rsc)) {
#ifdef DEBUG
                if (rddebug & RDB_STATUS)
                        printf("rdstatus: send C_CMD failed %d != %d\n",
                            rv, sizeof(sc->sc_rsc));
#endif
                return 1;
        }
        rv = hpibrecv(c, s, C_EXEC, &sc->sc_stat, sizeof(sc->sc_stat));
        if (rv != sizeof(sc->sc_stat)) {
#ifdef DEBUG
                if (rddebug & RDB_STATUS)
                        printf("rdstatus: send C_EXEC failed %d != %d\n",
                            rv, sizeof(sc->sc_stat));
#endif
                return 1;
        }
        rv = hpibrecv(c, s, C_QSTAT, &stat, 1);
        if (rv != 1 || stat) {
#ifdef DEBUG
                if (rddebug & RDB_STATUS)
                        printf("rdstatus: recv failed %d or bad stat %d\n",
                            rv, stat);
#endif
                return 1;
        }
        return 0;
}

/*
 * Deal with errors.
 * Returns 1 if request should be restarted,
 * 0 if we should just quietly give up.
 */
static int
rderror(int unit)
{
        struct rd_softc *sc = device_lookup_private(&rd_cd,unit);
        struct rd_stat *sp;
        struct buf *bp;
        daddr_t hwbn, pbn;
        char *hexstr(int, int); /* XXX */

        if (rdstatus(sc)) {
#ifdef DEBUG
                printf("%s: couldn't get status\n", device_xname(sc->sc_dev));
#endif
                rdreset(sc);
                return 1;
        }
        sp = &sc->sc_stat;
        if (sp->c_fef & FEF_REXMT)
                return 1;
        if (sp->c_fef & FEF_PF) {
                rdreset(sc);
                return 1;
        }
        /*
         * Unit requests release for internal maintenance.
         * We just delay awhile and try again later.  Use expontially
         * increasing backoff ala ethernet drivers since we don't really
         * know how long the maintenance will take.  With RDWAITC and
         * RDRETRY as defined, the range is 1 to 32 seconds.
         */
        if (sp->c_fef & FEF_IMR) {
                extern int hz;
                int rdtimo = RDWAITC << sc->sc_errcnt;
#ifdef DEBUG
                printf("%s: internal maintenance, %d second timeout\n",
                    device_xname(sc->sc_dev), rdtimo);
                sc->sc_stats.rdtimeouts++;
#endif
                hpibfree(device_parent(sc->sc_dev), &sc->sc_hq);
                callout_reset(&sc->sc_restart_ch, rdtimo * hz, rdrestart, sc);
                return 0;
        }
        /*
         * Only report error if we have reached the error reporting
         * threshhold.  By default, this will only report after the
         * retry limit has been exceeded.
         */
        if (sc->sc_errcnt < rderrthresh)
                return 1;

        /*
         * First conjure up the block number at which the error occurred.
         * Note that not all errors report a block number, in that case
         * we just use b_blkno.
         */
        bp = bufq_peek(sc->sc_tab);
        pbn = sc->sc_dkdev.dk_label->d_partitions[rdpart(bp->b_dev)].p_offset;
        if ((sp->c_fef & FEF_CU) || (sp->c_fef & FEF_DR) ||
            (sp->c_ief & IEF_RRMASK)) {
                hwbn = RDBTOS(pbn + bp->b_blkno);
                pbn = bp->b_blkno;
        } else {
                hwbn = sp->c_blk;
                pbn = RDSTOB(hwbn) - pbn;
        }
        /*
         * Now output a generic message suitable for badsect.
         * Note that we don't use harderr cuz it just prints
         * out b_blkno which is just the beginning block number
         * of the transfer, not necessary where the error occurred.
         */
        printf("%s%c: hard error sn%" PRId64 "\n", device_xname(sc->sc_dev),
            'a'+rdpart(bp->b_dev), pbn);
        /*
         * Now report the status as returned by the hardware with
         * attempt at interpretation (unless debugging).
         */
        printf("%s %s error:", device_xname(sc->sc_dev),
            (bp->b_flags & B_READ) ? "read" : "write");
#ifdef DEBUG
        if (rddebug & RDB_ERROR) {
                /* status info */
                printf("\n    volume: %d, unit: %d\n",
                    (sp->c_vu>>4)&0xF, sp->c_vu&0xF);
                rdprinterr("reject", sp->c_ref, err_reject);
                rdprinterr("fault", sp->c_fef, err_fault);
                rdprinterr("access", sp->c_aef, err_access);
                rdprinterr("info", sp->c_ief, err_info);
                printf("    block: %lld, P1-P10: ", hwbn);
                printf("0x%x", *(u_int *)&sp->c_raw[0]);
                printf("0x%x", *(u_int *)&sp->c_raw[4]);
                printf("0x%x\n", *(u_short *)&sp->c_raw[8]);
                /* command */
                printf("    ioc: ");
                printf("0x%x", *(u_int *)&sc->sc_ioc.c_pad);
                printf("0x%x", *(u_short *)&sc->sc_ioc.c_hiaddr);
                printf("0x%x", *(u_int *)&sc->sc_ioc.c_addr);
                printf("0x%x", *(u_short *)&sc->sc_ioc.c_nop2);
                printf("0x%x", *(u_int *)&sc->sc_ioc.c_len);
                printf("0x%x\n", *(u_short *)&sc->sc_ioc.c_cmd);
                return 1;
        }
#endif
        printf(" v%d u%d, R0x%x F0x%x A0x%x I0x%x\n",
            (sp->c_vu>>4)&0xF, sp->c_vu&0xF,
            sp->c_ref, sp->c_fef, sp->c_aef, sp->c_ief);
        printf("P1-P10: ");
        printf("0x%x", *(u_int *)&sp->c_raw[0]);
        printf("0x%x", *(u_int *)&sp->c_raw[4]);
        printf("0x%x\n", *(u_short *)&sp->c_raw[8]);
        return 1;
}

static int
rdread(dev_t dev, struct uio *uio, int flags)
{

        return physio(rdstrategy, NULL, dev, B_READ, minphys, uio);
}

static int
rdwrite(dev_t dev, struct uio *uio, int flags)
{

        return physio(rdstrategy, NULL, dev, B_WRITE, minphys, uio);
}

static int
rdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
        struct rd_softc *sc = device_lookup_private(&rd_cd, rdunit(dev));
        struct disklabel *lp = sc->sc_dkdev.dk_label;
        int error, flags;

        switch (cmd) {
        case DIOCGDINFO:
                *(struct disklabel *)data = *lp;
                return 0;

        case DIOCGPART:
                ((struct partinfo *)data)->disklab = lp;
                ((struct partinfo *)data)->part =
                    &lp->d_partitions[rdpart(dev)];
                return 0;

        case DIOCWLABEL:
                if ((flag & FWRITE) == 0)
                        return EBADF;
                if (*(int *)data)
                        sc->sc_flags |= RDF_WLABEL;
                else
                        sc->sc_flags &= ~RDF_WLABEL;
                return 0;

        case DIOCSDINFO:
                if ((flag & FWRITE) == 0)
                        return EBADF;
                return setdisklabel(lp, (struct disklabel *)data,
                    (sc->sc_flags & RDF_WLABEL) ? 0 : sc->sc_dkdev.dk_openmask,
                    NULL);

        case DIOCWDINFO:
                if ((flag & FWRITE) == 0)
                        return EBADF;
                error = setdisklabel(lp, (struct disklabel *)data,
                    (sc->sc_flags & RDF_WLABEL) ? 0 : sc->sc_dkdev.dk_openmask,
                    NULL);
                if (error)
                        return error;
                flags = sc->sc_flags;
                sc->sc_flags = RDF_ALIVE | RDF_WLABEL;
                error = writedisklabel(rdlabdev(dev), rdstrategy, lp, NULL);
                sc->sc_flags = flags;
                return error;

        case DIOCGDEFLABEL:
                rdgetdefaultlabel(sc, (struct disklabel *)data);
                return 0;
        }
        return EINVAL;
}

static void
rdgetdefaultlabel(struct rd_softc *sc, struct disklabel *lp)
{
        int type = sc->sc_type;

        memset((void *)lp, 0, sizeof(struct disklabel));

        lp->d_type = DTYPE_HPIB;
        lp->d_secsize = DEV_BSIZE;
        lp->d_nsectors = rdidentinfo[type].ri_nbpt;
        lp->d_ntracks = rdidentinfo[type].ri_ntpc;
        lp->d_ncylinders = rdidentinfo[type].ri_ncyl;
        lp->d_secperunit = rdidentinfo[type].ri_nblocks;
        lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;

        strlcpy(lp->d_typename, rdidentinfo[type].ri_desc,
            sizeof(lp->d_typename));
        strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
        lp->d_rpm = 3000;
        lp->d_interleave = 1;
        lp->d_flags = 0;

        lp->d_partitions[RAW_PART].p_offset = 0;
        lp->d_partitions[RAW_PART].p_size =
            lp->d_secperunit * (lp->d_secsize / DEV_BSIZE);
        lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
        lp->d_npartitions = RAW_PART + 1;

        lp->d_magic = DISKMAGIC;
        lp->d_magic2 = DISKMAGIC;
        lp->d_checksum = dkcksum(lp);
}

int
rdsize(dev_t dev)
{
        struct rd_softc *sc;
        int psize, didopen = 0;

        sc = device_lookup_private(&rd_cd, rdunit(dev));
        if (sc == NULL)
                return ENXIO;

        if ((sc->sc_flags & RDF_ALIVE) == 0)
                return ENXIO;

        /*
         * We get called very early on (via swapconf)
         * without the device being open so we may need
         * to handle it here.
         */
        if (sc->sc_dkdev.dk_openmask == 0) {
                if (rdopen(dev, FREAD|FWRITE, S_IFBLK, NULL))
                        return -1;
                didopen = 1;
        }
        psize = sc->sc_dkdev.dk_label->d_partitions[rdpart(dev)].p_size *
            (sc->sc_dkdev.dk_label->d_secsize / DEV_BSIZE);
        if (didopen)
                (void)rdclose(dev, FREAD|FWRITE, S_IFBLK, NULL);
        return psize;
}

#ifdef DEBUG
static void
rdprinterr(const char *str, short err, const char **tab)
{
        int i;
        int printed;

        if (err == 0)
                return;
        printf("    %s error %d field:", str, err);
        printed = 0;
        for (i = 0; i < 16; i++)
                if (err & (0x8000 >> i))
                        printf("%s%s", printed++ ? " + " : " ", tab[i]);
        printf("\n");
}
#endif

static int rddoingadump;        /* simple mutex */

/*
 * Non-interrupt driven, non-DMA dump routine.
 */
static int
rddump(dev_t dev, daddr_t blkno, void *va, size_t size)
{
        int sectorsize;         /* size of a disk sector */
        int nsects;             /* number of sectors in partition */
        int sectoff;            /* sector offset of partition */
        int totwrt;             /* total number of sectors left to write */
        int nwrt;               /* current number of sectors to write */
        int unit, part;
        int ctlr, slave;
        struct rd_softc *sc;
        struct disklabel *lp;
        char stat;

        /* Check for recursive dump; if so, punt. */
        if (rddoingadump)
                return EFAULT;
        rddoingadump = 1;

        /* Decompose unit and partition. */
        unit = rdunit(dev);
        part = rdpart(dev);

        /* Make sure dump device is ok. */
        sc = device_lookup_private(&rd_cd, rdunit(dev));
        if (sc == NULL)
                return ENXIO;

        if ((sc->sc_flags & RDF_ALIVE) == 0)
                return ENXIO;

        ctlr = device_unit(device_parent(sc->sc_dev));
        slave = sc->sc_slave;

        /*
         * Convert to disk sectors.  Request must be a multiple of size.
         */
        lp = sc->sc_dkdev.dk_label;
        sectorsize = lp->d_secsize;
        if ((size % sectorsize) != 0)
                return EFAULT;
        totwrt = size / sectorsize;
        blkno = dbtob(blkno) / sectorsize;      /* blkno in DEV_BSIZE units */

        nsects = lp->d_partitions[part].p_size;
        sectoff = lp->d_partitions[part].p_offset;

        /* Check transfer bounds against partition size. */
        if ((blkno < 0) || (blkno + totwrt) > nsects)
                return EINVAL;

        /* Offset block number to start of partition. */
        blkno += sectoff;

        while (totwrt > 0) {
                nwrt = totwrt;          /* XXX */
#ifndef RD_DUMP_NOT_TRUSTED
                /*
                 * Fill out and send HPIB command.
                 */
                sc->sc_ioc.c_unit = C_SUNIT(sc->sc_punit);
                sc->sc_ioc.c_volume = C_SVOL(0);
                sc->sc_ioc.c_saddr = C_SADDR;
                sc->sc_ioc.c_hiaddr = 0;
                sc->sc_ioc.c_addr = RDBTOS(blkno);
                sc->sc_ioc.c_nop2 = C_NOP;
                sc->sc_ioc.c_slen = C_SLEN;
                sc->sc_ioc.c_len = nwrt * sectorsize;
                sc->sc_ioc.c_cmd = C_WRITE;
                hpibsend(ctlr, slave, C_CMD, &sc->sc_ioc.c_unit,
                    sizeof(sc->sc_ioc) - 2);
                if (hpibswait(ctlr, slave))
                        return EIO;

                /*
                 * Send the data.
                 */
                hpibsend(ctlr, slave, C_EXEC, va, nwrt * sectorsize);
                (void) hpibswait(ctlr, slave);
                hpibrecv(ctlr, slave, C_QSTAT, &stat, 1);
                if (stat)
                        return EIO;
#else /* RD_DUMP_NOT_TRUSTED */
                /* Let's just talk about this first... */
                printf("%s: dump addr %p, blk %d\n", device_xname(sc->sc_dev),
                    va, blkno);
                delay(500 * 1000);      /* half a second */
#endif /* RD_DUMP_NOT_TRUSTED */

                /* update block count */
                totwrt -= nwrt;
                blkno += nwrt;
                va = (char *)va + sectorsize * nwrt;
        }
        rddoingadump = 0;
        return 0;
}