151 lines
4.4 KiB
C
151 lines
4.4 KiB
C
/* $NetBSD: rz.c,v 1.4 1994/10/26 21:10:58 cgd Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)rz.c 8.1 (Berkeley) 6/10/93
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*/
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#include <stand/stand.h>
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#include <sys/param.h>
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#include <sys/disklabel.h>
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struct rz_softc {
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int sc_fd; /* PROM file id */
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int sc_ctlr; /* controller number */
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int sc_unit; /* disk unit number */
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int sc_part; /* disk partition number */
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struct disklabel sc_label; /* disk label for this disk */
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};
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int
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rzstrategy(devdata, rw, bn, reqcnt, addr, cnt)
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void *devdata;
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int rw;
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daddr_t bn;
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u_int reqcnt;
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char *addr;
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u_int *cnt; /* out: number of bytes transfered */
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{
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register struct rz_softc *sc = (struct rz_softc *)devdata;
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register int part = sc->sc_part;
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register struct partition *pp = &sc->sc_label.d_partitions[part];
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register int s;
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long offset;
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offset = bn * DEV_BSIZE;
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/*
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* Partial-block transfers not handled.
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*/
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if (reqcnt & (DEV_BSIZE - 1)) {
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*cnt = 0;
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return (EINVAL);
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}
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offset += pp->p_offset * DEV_BSIZE;
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if (prom_lseek(sc->sc_fd, offset, 0) < 0)
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return (EIO);
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s = prom_read(sc->sc_fd, addr, reqcnt);
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if (s < 0)
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return (EIO);
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*cnt = s;
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return (0);
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}
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int
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rzopen(f, ctlr, unit, part)
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struct open_file *f;
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int ctlr, unit, part;
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{
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register struct rz_softc *sc;
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register struct disklabel *lp;
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register int i;
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char *msg;
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char buf[DEV_BSIZE];
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int cnt;
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static char device[] = "rz(0,0,0)";
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if (unit >= 8 || part >= 8)
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return (ENXIO);
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device[5] = '0' + unit;
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/* NOTE: only support reads for now */
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if ((i = prom_open(device, 0)) < 0)
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return (ENXIO);
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sc = alloc(sizeof(struct rz_softc));
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bzero(sc, sizeof(struct rz_softc));
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f->f_devdata = (void *)sc;
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sc->sc_fd = i;
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sc->sc_ctlr = ctlr;
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sc->sc_unit = unit;
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sc->sc_part = part;
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/* try to read disk label and partition table information */
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lp = &sc->sc_label;
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lp->d_secsize = DEV_BSIZE;
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lp->d_secpercyl = 1;
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lp->d_npartitions = MAXPARTITIONS;
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lp->d_partitions[part].p_offset = 0;
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lp->d_partitions[part].p_size = 0x7fffffff;
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i = rzstrategy(sc, F_READ, (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
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if (i || cnt != DEV_BSIZE) {
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printf("rz%d: error reading disk label\n", unit);
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goto bad;
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} else {
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msg = getdisklabel(buf, lp);
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if (msg) {
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printf("rz%d: %s\n", unit, msg);
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goto bad;
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}
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}
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if (part >= lp->d_npartitions || lp->d_partitions[part].p_size == 0) {
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bad:
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free(sc, sizeof(struct rz_softc));
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return (ENXIO);
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}
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return (0);
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}
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rzclose(f)
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struct open_file *f;
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{
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free(f->f_devdata, sizeof(struct rz_softc));
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f->f_devdata = (void *)0;
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return (0);
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}
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