/*      $OpenBSD: disk.c,v 1.20 2023/01/16 07:29:35 deraadt Exp $       */
/*      $NetBSD: disk.c,v 1.6 1997/04/06 08:40:33 cgd Exp $     */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
 *
 * 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.
 *
 *      @(#)rz.c        8.1 (Berkeley) 6/10/93
 */

#include <lib/libsa/stand.h>

#include <sys/param.h>
#include <sys/disklabel.h>

#include <machine/rpb.h>
#include <machine/prom.h>

#include "disk.h"

struct  disk_softc {
        int     sc_fd;                  /* PROM channel number */
        int     sc_ctlr;                /* controller number */
        int     sc_unit;                /* disk unit number */
        int     sc_part;                /* disk partition number */
        struct  disklabel sc_label;     /* disk label for this disk */
};

int
diskstrategy(void *devdata, int rw, daddr_t bn, size_t reqcnt, void *addrvoid,
    size_t *cnt)
{
        char *addr = addrvoid;
        struct disk_softc *sc;
        struct partition *pp;
        prom_return_t ret;
        int s;

        if ((reqcnt & 0xffffff) != reqcnt ||
            reqcnt == 0)
                asm("call_pal 0");

        twiddle();

        /* Partial-block transfers not handled. */
        if (reqcnt & (DEV_BSIZE - 1)) {
                *cnt = 0;
                return (EINVAL);
        }

        sc = (struct disk_softc *)devdata;
        pp = &sc->sc_label.d_partitions[sc->sc_part];

        if (rw == F_READ)
                ret.bits = prom_read(sc->sc_fd, reqcnt, addr, bn + pp->p_offset);
        else
                ret.bits = prom_write(sc->sc_fd, reqcnt, addr, bn + pp->p_offset);
        if (ret.u.status)
                return (EIO);
        if (cnt)
                *cnt = ret.u.retval;
        return (0);
}

int
diskopen(struct open_file *f, int ctlr, int unit, int part)
{
        struct disklabel *lp;
        prom_return_t ret;
        size_t cnt;
        int devlen, i;
        char *msg, buf[DEV_BSIZE], devname[32];
        struct disk_softc *sc;

        if (unit >= 16 || part >= MAXPARTITIONS)
                return (ENXIO);
        /*
         * XXX
         * We don't know what device names look like yet,
         * so we can't change them.
         */
        ret.bits = prom_getenv(PROM_E_BOOTED_DEV, devname, sizeof(devname));
        devlen = ret.u.retval;

        ret.bits = prom_open((u_int64_t)devname, devlen);
        if (ret.u.status == 2)
                return (ENXIO);
        if (ret.u.status == 3)
                return (EIO);

        sc = alloc(sizeof(struct disk_softc));
        bzero(sc, sizeof(struct disk_softc));
        f->f_devdata = (void *)sc;

        sc->sc_fd = ret.u.retval;
        sc->sc_ctlr = ctlr;
        sc->sc_unit = unit;
        sc->sc_part = part;

        /* Try to read disk label and partition table information. */
        lp = &sc->sc_label;
        lp->d_secsize = DEV_BSIZE;
        lp->d_secpercyl = 1;
        lp->d_npartitions = MAXPARTITIONS;
        DL_SETPOFFSET(&lp->d_partitions[part], 0);
        DL_SETPSIZE(&lp->d_partitions[part], 0x7fffffff);
        i = diskstrategy(sc, F_READ,
            LABELSECTOR, DEV_BSIZE, buf, &cnt);
        if (i || cnt != DEV_BSIZE) {
                printf("disk%d: error reading disk label\n", unit);
                goto bad;
        } else if (((struct disklabel *)(buf + LABELOFFSET))->d_magic !=
                    DISKMAGIC) {
                /* No label at all.  Fake all partitions as whole disk. */
                for (i = 0; i < MAXPARTITIONS; i++) {
                        DL_SETPOFFSET(&lp->d_partitions[part], 0);
                        DL_SETPSIZE(&lp->d_partitions[part], 0x7fffffff);
                }
        } else {
                msg = getdisklabel(buf + LABELOFFSET, lp);
                if (msg) {
                        printf("disk%d: %s\n", unit, msg);
                        goto bad;
                }
        }

        if (part >= lp->d_npartitions ||
            DL_GETPSIZE(&lp->d_partitions[part]) == 0) {
bad:            free(sc, sizeof(struct disk_softc));
                return (ENXIO);
        }
        return (0);
}

int
diskclose(struct open_file *f)
{
        struct disk_softc *sc;

        sc = f->f_devdata;
        (void)prom_close(sc->sc_fd);

        free(sc, sizeof(struct disk_softc));
        f->f_devdata = NULL;
        return (0);
}