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disk.c revision 1.5
      1 /*	$NetBSD: disk.c,v 1.5 2011/02/20 07:52:43 matt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)disk.c	8.1 (Berkeley) 6/10/93
     35  */
     36 
     37 #include <lib/libsa/stand.h>
     38 #include <machine/stdarg.h>
     39 
     40 #include <sys/param.h>
     41 #include <sys/disklabel.h>
     42 
     43 #include <dev/arcbios/arcbios.h>
     44 
     45 #include "common.h"
     46 #include "disk.h"
     47 
     48 #define	RF_PROTECTED_SECTORS	64	/* XXX refer to <.../rf_optnames.h> */
     49 
     50 struct	disk_softc {
     51 	u_long	sc_fd;			/* ARCBIOS file id */
     52 	int	sc_part;		/* disk partition number */
     53 	struct	disklabel sc_label;	/* disk label for this disk */
     54 };
     55 
     56 int
     57 diskstrategy(void *devdata, int rw, daddr_t bn, size_t reqcnt, void *addr,
     58     size_t *cnt)
     59 {
     60 	struct disk_softc *sc = (struct disk_softc *)devdata;
     61 	int part = sc->sc_part;
     62 	struct partition *pp = &sc->sc_label.d_partitions[part];
     63 	long error;
     64 	int64_t offset;
     65 	u_long count;
     66 
     67 	offset = bn;
     68 
     69 	/*
     70 	 * Partial-block transfers not handled.
     71 	 */
     72 	if (reqcnt & (DEV_BSIZE - 1)) {
     73 		*cnt = 0;
     74 		return EINVAL;
     75 	}
     76 
     77 	offset += pp->p_offset;
     78 
     79 	if (pp->p_fstype == FS_RAID)
     80 		offset += RF_PROTECTED_SECTORS;
     81 
     82 	/*
     83 	 * Convert from blocks to bytes.
     84 	 */
     85 	offset *= DEV_BSIZE;
     86 
     87 	error = arcbios_Seek(sc->sc_fd, &offset, 0);
     88 	if (error != ARCBIOS_ESUCCESS)
     89 		return EIO;
     90 	error = arcbios_Read(sc->sc_fd, addr, reqcnt, &count);
     91 	if (error != ARCBIOS_ESUCCESS)
     92 		return EIO;
     93 
     94 	*cnt = count;
     95 	return 0;
     96 }
     97 
     98 int
     99 diskopen(struct open_file *f, ...)
    100 {
    101 	int part;
    102 
    103 	struct disk_softc *sc;
    104 	struct disklabel *lp;
    105 #ifdef arc
    106 	char *msg, buf[DEV_BSIZE];
    107 	size_t cnt;
    108 	int mbrp_off, i;
    109 #endif
    110 	int error;
    111 	u_long fd;
    112 	char *device;
    113 	va_list ap;
    114 
    115 	va_start(ap, f);
    116 
    117 	device = va_arg(ap, char *);
    118 
    119 	/*
    120 	 * For NetBSD/sgimips, since we use the SGI partition map directly,
    121 	 * we fake an in-core NetBSD disklabel with offset of 0.
    122 	 *
    123 	 * For NetBSD/arc, there is a MBR partition map on the disk, which we
    124 	 * then expect to find a NetBSD disklabel within the MBR partition.
    125 	 * We require that the kernel be located in first partition in the
    126 	 * NetBSD disklabel, because we have not other way to represent the
    127 	 * root partition.
    128 	 */
    129 	part = 0;
    130 
    131 	if (part >= MAXPARTITIONS)
    132 		return ENXIO;
    133 
    134 	error = arcbios_Open(device, 0, &fd);
    135 	if (error) {
    136 		printf("diskopen: open failed, errno = %d\n", error);
    137 		return ENXIO;
    138 	}
    139 
    140 	sc = alloc(sizeof(struct disk_softc));
    141 	memset(sc, 0, sizeof(struct disk_softc));
    142 	f->f_devdata = (void *)sc;
    143 
    144 	sc->sc_fd = fd;
    145 	sc->sc_part = part;
    146 
    147 	/* try to read disk label and partition table information */
    148 	lp = &sc->sc_label;
    149 	lp->d_secsize = DEV_BSIZE;
    150 	lp->d_secpercyl = 1;
    151 	lp->d_npartitions = MAXPARTITIONS;
    152 	lp->d_partitions[part].p_offset = 0;
    153 	lp->d_partitions[part].p_size = 0x7fffffff;
    154 
    155 #ifdef arc
    156 	error = diskstrategy(sc, F_READ, (daddr_t)LABELSECTOR, DEV_BSIZE,
    157 	    buf, &cnt);
    158 	if (error || cnt != DEV_BSIZE) {
    159 		printf("%s: can't read disklabel, errno = %d\n",
    160 		    device, error);
    161 		dealloc(sc, sizeof(struct disk_softc));
    162 		return ENXIO;
    163 	}
    164 	msg = getdisklabel(buf, lp);
    165 	if (msg) {
    166 		/* If no label, just assume 0 and return */
    167 		return 0;
    168 	}
    169 
    170 	/*
    171 	 * On arc, we can't open whole disk, but can open each partition with
    172 	 * OSLOADPARTITION like scsi(0)disk(0)rdisk()partition(1) etc.
    173 	 * Thus, we don't have to add offset of the MBR partition.
    174 	 */
    175 	/* XXX magic: partition 2 is whole NetBSD partition */
    176 	mbrp_off = lp->d_partitions[2].p_offset;
    177 	for (i = 0; i < MAXPARTITIONS; i++) {
    178 		if (lp->d_partitions[i].p_fstype != FS_UNUSED &&
    179 		    lp->d_partitions[i].p_offset >= mbrp_off)
    180 			lp->d_partitions[i].p_offset -= mbrp_off;
    181 	}
    182 
    183 	if (part >= lp->d_npartitions ||
    184 	    lp->d_partitions[part].p_fstype == FS_UNUSED ||
    185 	    lp->d_partitions[part].p_size == 0) {
    186 		dealloc(sc, sizeof(struct disk_softc));
    187 		return ENXIO;
    188 	}
    189 #endif
    190 	return 0;
    191 }
    192 
    193 #ifndef LIBSA_NO_DEV_CLOSE
    194 int
    195 diskclose(struct open_file *f)
    196 {
    197 
    198 	arcbios_Close(((struct disk_softc *)(f->f_devdata))->sc_fd);
    199 	dealloc(f->f_devdata, sizeof(struct disk_softc));
    200 	f->f_devdata = NULL;
    201 	return 0;
    202 }
    203 #endif
    204