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 39#include <sys/param.h> 40#include <sys/disklabel.h> 41 42#include <dev/arcbios/arcbios.h> 43 44#include "common.h" 45#include "disk.h" 46 47#define RF_PROTECTED_SECTORS 64 /* XXX refer to <.../rf_optnames.h> */ 48 49struct disk_softc { 50 u_long sc_fd; /* ARCBIOS file id */ 51 int sc_part; /* disk partition number */ 52 struct disklabel sc_label; /* disk label for this disk */ 53}; 54 55int 56diskstrategy(void *devdata, int rw, daddr_t bn, size_t reqcnt, void *addr, 57 size_t *cnt) 58{ 59 struct disk_softc *sc = (struct disk_softc *)devdata; 60 int part = sc->sc_part; 61 struct partition *pp = &sc->sc_label.d_partitions[part]; 62 long error; 63 int64_t offset; 64 u_long count; 65 66 offset = bn; 67 68 /* 69 * Partial-block transfers not handled. 70 */ 71 if (reqcnt & (DEV_BSIZE - 1)) { 72 *cnt = 0; 73 return EINVAL; 74 } 75 76 offset += pp->p_offset; 77 78 if (pp->p_fstype == FS_RAID) 79 offset += RF_PROTECTED_SECTORS; 80 81 /* 82 * Convert from blocks to bytes. 83 */ 84 offset *= DEV_BSIZE; 85 86 error = arcbios_Seek(sc->sc_fd, &offset, 0); 87 if (error != ARCBIOS_ESUCCESS) 88 return EIO; 89 error = arcbios_Read(sc->sc_fd, addr, reqcnt, &count); 90 if (error != ARCBIOS_ESUCCESS) 91 return EIO; 92 93 *cnt = count; 94 return 0; 95} 96 97int 98diskopen(struct open_file *f, ...) 99{ 100 int part; 101 102 struct disk_softc *sc; 103 struct disklabel *lp; 104#ifdef arc 105 char *msg, buf[DEV_BSIZE]; 106 size_t cnt; 107 int mbrp_off, i; 108#endif 109 int error; 110 u_long fd; 111 char *device; 112 va_list ap; 113 114 va_start(ap, f); 115 116 device = va_arg(ap, char *); 117 118 /* 119 * For NetBSD/sgimips, since we use the SGI partition map directly, 120 * we fake an in-core NetBSD disklabel with offset of 0. 121 * 122 * For NetBSD/arc, there is a MBR partition map on the disk, which we 123 * then expect to find a NetBSD disklabel within the MBR partition. 124 * We require that the kernel be located in first partition in the 125 * NetBSD disklabel, because we have not other way to represent the 126 * root partition. 127 */ 128 part = 0; 129 130 if (part >= MAXPARTITIONS) 131 return ENXIO; 132 133 error = arcbios_Open(device, 0, &fd); 134 if (error) { 135 printf("diskopen: open failed, errno = %d\n", error); 136 return ENXIO; 137 } 138 139 sc = alloc(sizeof(struct disk_softc)); 140 memset(sc, 0, sizeof(struct disk_softc)); 141 f->f_devdata = (void *)sc; 142 143 sc->sc_fd = fd; 144 sc->sc_part = part; 145 146 /* try to read disk label and partition table information */ 147 lp = &sc->sc_label; 148 lp->d_secsize = DEV_BSIZE; 149 lp->d_secpercyl = 1; 150 lp->d_npartitions = MAXPARTITIONS; 151 lp->d_partitions[part].p_offset = 0; 152 lp->d_partitions[part].p_size = 0x7fffffff; 153 154#ifdef arc 155 error = diskstrategy(sc, F_READ, (daddr_t)LABELSECTOR, DEV_BSIZE, 156 buf, &cnt); 157 if (error || cnt != DEV_BSIZE) { 158 printf("%s: can't read disklabel, errno = %d\n", 159 device, error); 160 dealloc(sc, sizeof(struct disk_softc)); 161 return ENXIO; 162 } 163 msg = getdisklabel(buf, lp); 164 if (msg) { 165 /* If no label, just assume 0 and return */ 166 return 0; 167 } 168 169 /* 170 * On arc, we can't open whole disk, but can open each partition with 171 * OSLOADPARTITION like scsi(0)disk(0)rdisk()partition(1) etc. 172 * Thus, we don't have to add offset of the MBR partition. 173 */ 174 /* XXX magic: partition 2 is whole NetBSD partition */ 175 mbrp_off = lp->d_partitions[2].p_offset; 176 for (i = 0; i < MAXPARTITIONS; i++) { 177 if (lp->d_partitions[i].p_fstype != FS_UNUSED && 178 lp->d_partitions[i].p_offset >= mbrp_off) 179 lp->d_partitions[i].p_offset -= mbrp_off; 180 } 181 182 if (part >= lp->d_npartitions || 183 lp->d_partitions[part].p_fstype == FS_UNUSED || 184 lp->d_partitions[part].p_size == 0) { 185 dealloc(sc, sizeof(struct disk_softc)); 186 return ENXIO; 187 } 188#endif 189 return 0; 190} 191 192#ifndef LIBSA_NO_DEV_CLOSE 193int 194diskclose(struct open_file *f) 195{ 196 197 arcbios_Close(((struct disk_softc *)(f->f_devdata))->sc_fd); 198 dealloc(f->f_devdata, sizeof(struct disk_softc)); 199 f->f_devdata = NULL; 200 return 0; 201} 202#endif 203