1 /* $NetBSD: devopen.c,v 1.7 2008/05/13 14:26:20 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Rolf Grossmann. 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 "boot.h" 36 37 extern const struct fs_ops file_system_nfs; 38 39 /* 40 * Parse a device spec. 41 * 42 * Format: 43 * [device:][filename] 44 */ 45 int 46 devparse(const char *fname, int *dev, uint8_t *unit, uint8_t *part, 47 const char **file) 48 { 49 const char *col; 50 51 *unit = 0; /* default to wd0a */ 52 *part = 0; 53 *dev = 0; 54 *file = DEFKERNELNAME; 55 56 if (fname == NULL) 57 return 0; 58 59 if ((col = strchr(fname, ':')) != NULL) { 60 int devlen; 61 uint8_t i, u, p; 62 struct devsw *dp; 63 char devname[MAXDEVNAME]; 64 65 devlen = col - fname; 66 if (devlen > MAXDEVNAME) 67 return EINVAL; 68 69 #define isnum(c) (((c) >= '0') && ((c) <= '9')) 70 #define isalpha(c) (((c) >= 'a') && ((c) <= 'z')) 71 72 /* extract device name */ 73 for (i = 0; isalpha(fname[i]) && (i < devlen); i++) 74 devname[i] = fname[i]; 75 devname[i] = '\0'; 76 77 if (strcmp(devname, "nfs") == 0) { 78 /* no unit number or partition suffix on netboot */ 79 u = 0; 80 p = 0; 81 nfsys = 1; 82 file_system[0] = file_system_nfs; 83 } else { 84 /* parse [disk][unit][part] (ex. wd0a) strings */ 85 if (!isnum(fname[i])) 86 return EUNIT; 87 88 /* device number */ 89 for (u = 0; isnum(fname[i]) && (i < devlen); i++) 90 u = u * 10 + (fname[i] - '0'); 91 92 if (!isalpha(fname[i])) 93 return EPART; 94 95 /* partition number */ 96 p = 0; 97 if (i < devlen) 98 p = fname[i++] - 'a'; 99 100 if (i != devlen) 101 return ENXIO; 102 } 103 104 /* check device name */ 105 for (dp = devsw, i = 0; i < ndevs; dp++, i++) { 106 if (dp->dv_name && !strcmp(devname, dp->dv_name)) 107 break; 108 } 109 110 if (i >= ndevs) 111 return ENXIO; 112 113 *unit = u; 114 *part = p; 115 *dev = i; 116 fname = ++col; 117 } 118 119 if (*fname) 120 *file = fname; 121 122 return 0; 123 } 124 125 int 126 devopen(struct open_file *f, const char *fname, char **file) 127 { 128 struct devsw *dp; 129 uint8_t unit, part; 130 int dev, error; 131 132 DPRINTF(("devopen(%s)\n", fname)); 133 134 if ((error = devparse(fname, &dev, &unit, &part, 135 (const char **)file)) != 0) 136 return error; 137 138 dp = &devsw[dev]; 139 if ((void *)dp->dv_open == (void *)nodev) 140 return ENXIO; 141 142 f->f_dev = dp; 143 144 if ((error = (*dp->dv_open)(f, unit, part)) != 0) 145 printf("%s%d%c: %d = %s\n", devsw[dev].dv_name, 146 unit, 'a' + part, error, strerror(error)); 147 148 return error; 149 } 150