1 /* $NetBSD: disk.c,v 1.10 2011/02/20 07:59:52 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