1 /* $NetBSD: bootfs.c,v 1.4 2008/04/28 20:23:18 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by UCHIYAMA Yasushi. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <lib/libsa/stand.h> 33 #include <lib/libkern/libkern.h> 34 35 #include <machine/param.h> 36 #include <machine/bfs.h> 37 #include <machine/sector.h> 38 39 #include "local.h" 40 41 /* System V bfs */ 42 43 FS_DEF(bfs); 44 45 struct fs_ops bfs_ops = { 46 bfs_open, bfs_close, bfs_read, bfs_write, bfs_seek, bfs_stat 47 }; 48 49 struct bfs_file { 50 struct bfs *bfs; 51 int start, end; 52 size_t size; 53 int cur; 54 uint8_t buf[DEV_BSIZE]; 55 }; 56 57 int 58 bfs_open(const char *name, struct open_file *f) 59 { 60 struct bfs_file *file; 61 62 if ((file = alloc(sizeof *file)) == 0) 63 return -1; 64 memset(file, 0, sizeof *file); 65 66 if (bfs_init(&file->bfs) != 0) { 67 dealloc(file, sizeof *file); 68 return -2; 69 } 70 71 if (!bfs_file_lookup(file->bfs, name, &file->start, &file->end, 72 &file->size)) { 73 bfs_fini(file->bfs); 74 dealloc(file, sizeof *file); 75 return -3; 76 } 77 78 printf("%s: %s %d %d %d\n", __func__, name, file->start, 79 file->end, file->size); 80 81 f->f_fsdata = file; 82 83 return 0; 84 } 85 86 int 87 bfs_close(struct open_file *f) 88 { 89 struct bfs_file *file = f->f_fsdata; 90 91 bfs_fini(file->bfs); 92 93 return 0; 94 } 95 96 int 97 bfs_read(struct open_file *f, void *buf, size_t size, size_t *resid) 98 { 99 struct bfs_file *file = f->f_fsdata; 100 int n, start, end; 101 uint8_t *p = buf; 102 size_t bufsz = size; 103 int cur = file->cur; 104 105 if (cur + size > file->size) 106 size = file->size - cur; 107 108 start = file->start + (cur >> DEV_BSHIFT); 109 end = file->start + ((cur + size) >> DEV_BSHIFT); 110 111 /* first sector */ 112 if (!sector_read(0, file->buf, start)) 113 return -2; 114 n = TRUNC_SECTOR(cur) + DEV_BSIZE - cur; 115 if (n >= size) { 116 memcpy(p, file->buf + DEV_BSIZE - n, size); 117 goto done; 118 } 119 memcpy(p, file->buf + DEV_BSIZE - n, n); 120 p += n; 121 122 if ((end - start - 1) > 0) { 123 if (!sector_read_n(0, p, start + 1, end - start - 1)) 124 return -2; 125 p += (end - start - 1) * DEV_BSIZE; 126 } 127 128 /* last sector */ 129 if (!sector_read(0, file->buf, end)) 130 return -2; 131 n = cur + size - TRUNC_SECTOR(cur + size); 132 memcpy(p, file->buf, n); 133 134 done: 135 file->cur += size; 136 137 if (resid) 138 *resid = bufsz - size; 139 140 return 0; 141 } 142 143 int 144 bfs_write(struct open_file *f, void *start, size_t size, size_t *resid) 145 { 146 147 return -1; 148 } 149 150 off_t 151 bfs_seek(struct open_file *f, off_t offset, int where) 152 { 153 struct bfs_file *file = f->f_fsdata; 154 int cur; 155 156 switch (where) { 157 case SEEK_SET: 158 cur = offset; 159 break; 160 case SEEK_CUR: 161 cur = file->cur + offset; 162 break; 163 case SEEK_END: 164 cur = file->size + offset; 165 break; 166 default: 167 return EINVAL; 168 } 169 170 if (cur < 0 || cur >= file->size) { 171 return EINVAL; 172 } 173 174 file->cur = cur; 175 176 return (off_t)cur; 177 } 178 179 int 180 bfs_stat(struct open_file *f, struct stat *stat) 181 { 182 struct bfs_file *file = f->f_fsdata; 183 184 stat->st_size = file->size; 185 186 return 0; 187 } 188