1 /* $NetBSD: disk.c,v 1.5 2004/10/04 19:59:51 he 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 extern const struct arcbios_fv *ARCBIOS; 51 52 struct disk_softc { 53 int sc_fd; /* PROM file id */ 54 int sc_part; /* disk partition number */ 55 struct disklabel sc_label; /* disk label for this disk */ 56 }; 57 58 int 59 diskstrategy(devdata, rw, bn, reqcnt, addr, cnt) 60 void *devdata; 61 int rw; 62 daddr_t bn; 63 size_t reqcnt; 64 void *addr; 65 size_t *cnt; /* out: number of bytes transfered */ 66 { 67 struct disk_softc *sc = (struct disk_softc *)devdata; 68 int part = sc->sc_part; 69 struct partition *pp = &sc->sc_label.d_partitions[part]; 70 int s; 71 int64_t offset; 72 paddr_t count; 73 74 offset = bn; 75 76 /* 77 * Partial-block transfers not handled. 78 */ 79 if (reqcnt & (DEV_BSIZE - 1)) { 80 *cnt = 0; 81 return (EINVAL); 82 } 83 84 offset += pp->p_offset; 85 86 if (pp->p_fstype == FS_RAID) 87 offset += RF_PROTECTED_SECTORS; 88 89 /* 90 * Convert from blocks to bytes. 91 */ 92 offset *= DEV_BSIZE; 93 94 s = ARCBIOS->Seek(sc->sc_fd, &offset, 0); 95 s = ARCBIOS->Read(sc->sc_fd, addr, reqcnt, &count); 96 97 if (s < 0) 98 return (EIO); 99 100 *cnt = count; 101 return (0); 102 } 103 104 int 105 diskopen(struct open_file *f, ...) 106 { 107 int part; 108 109 struct disk_softc *sc; 110 struct disklabel *lp; 111 #ifdef arc 112 char *msg, buf[DEV_BSIZE]; 113 #endif 114 int i; 115 paddr_t i_arg; 116 char *device; 117 va_list ap; 118 119 va_start(ap, f); 120 121 device = va_arg(ap, char *); 122 123 /* 124 * For NetBSD/sgimips, since we use the SGI partition map directly, 125 * we fake an in-core NetBSD disklabel with offset of 0. 126 * 127 * For NetBSD/arc, there is a MBR partition map on the disk, which we 128 * then expect to find a NetBSD disklabel within the MBR partition. 129 * We require that the kernel be located in first partition in the 130 * NetBSD disklabel, because we have not other way to represent the 131 * root partition. 132 */ 133 part = 0; 134 135 if (part >= 16) 136 return (ENXIO); 137 138 if (ARCBIOS->Open(device, 0, &i_arg)) { 139 printf("open failed\n"); 140 return (ENXIO); 141 } 142 i = (int)i_arg; 143 144 sc = alloc(sizeof(struct disk_softc)); 145 memset(sc, 0, sizeof(struct disk_softc)); 146 f->f_devdata = (void *)sc; 147 148 sc->sc_fd = i; 149 sc->sc_part = part; 150 151 /* try to read disk label and partition table information */ 152 lp = &sc->sc_label; 153 lp->d_secsize = DEV_BSIZE; 154 lp->d_secpercyl = 1; 155 lp->d_npartitions = MAXPARTITIONS; 156 lp->d_partitions[part].p_offset = 0; 157 lp->d_partitions[part].p_size = 0x7fffffff; 158 159 #ifdef arc 160 i = diskstrategy(sc, F_READ, (daddr_t)LABELSECTOR, DEV_BSIZE, 161 buf, &cnt); 162 if (i || cnt != DEV_BSIZE) { 163 printf("%s: error reading disk label\n", device); 164 free(sc, sizeof(struct disk_softc)); 165 return (ENXIO); 166 } 167 msg = getdisklabel(buf, lp); 168 if (msg) { 169 /* If no label, just assume 0 and return */ 170 return (0); 171 } 172 #endif 173 174 if (part >= lp->d_npartitions || lp->d_partitions[part].p_size == 0) { 175 free(sc, sizeof(struct disk_softc)); 176 return (ENXIO); 177 } 178 return (0); 179 } 180 181 #ifndef LIBSA_NO_DEV_CLOSE 182 int 183 diskclose(f) 184 struct open_file *f; 185 { 186 ARCBIOS->Close(((struct disk_softc *)(f->f_devdata))->sc_fd); 187 free(f->f_devdata, sizeof(struct disk_softc)); 188 f->f_devdata = (void *)0; 189 return (0); 190 } 191 #endif 192