1 /* $NetBSD: devopen.c,v 1.6 2008/04/28 20:23:16 martin 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 /* 38 * Parse a device spec. 39 * 40 * Format: 41 * [device:][filename] 42 */ 43 int 44 devparse(const char *fname, int *dev, uint8_t *unit, uint8_t *part, 45 const char **file) 46 { 47 const char *col; 48 49 *unit = 0; /* default to wd0a */ 50 *part = 0; 51 *dev = 0; 52 *file = DEFKERNELNAME; 53 54 if (fname == NULL) 55 return 0; 56 57 if ((col = strchr(fname, ':')) != NULL) { 58 int devlen; 59 uint8_t i, u, p; 60 struct devsw *dp; 61 char devname[MAXDEVNAME]; 62 63 devlen = col - fname; 64 if (devlen > MAXDEVNAME) 65 return EINVAL; 66 67 #define isnum(c) (((c) >= '0') && ((c) <= '9')) 68 #define isalpha(c) (((c) >= 'a') && ((c) <= 'z')) 69 70 /* extract device name */ 71 for (i = 0; isalpha(fname[i]) && (i < devlen); i++) 72 devname[i] = fname[i]; 73 devname[i] = '\0'; 74 75 if (strcmp(devname, "nfs") == 0) { 76 /* no unit number or partition suffix on netboot */ 77 u = 0; 78 p = 0; 79 } else { 80 /* parse [disk][unit][part] (ex. wd0a) strings */ 81 if (!isnum(fname[i])) 82 return EUNIT; 83 84 /* device number */ 85 for (u = 0; isnum(fname[i]) && (i < devlen); i++) 86 u = u * 10 + (fname[i] - '0'); 87 88 if (!isalpha(fname[i])) 89 return EPART; 90 91 /* partition number */ 92 p = 0; 93 if (i < devlen) 94 p = fname[i++] - 'a'; 95 96 if (i != devlen) 97 return ENXIO; 98 } 99 100 /* check device name */ 101 for (dp = devsw, i = 0; i < ndevs; dp++, i++) { 102 if (dp->dv_name && !strcmp(devname, dp->dv_name)) 103 break; 104 } 105 106 if (i >= ndevs) 107 return ENXIO; 108 109 *unit = u; 110 *part = p; 111 *dev = i; 112 fname = ++col; 113 } 114 115 if (*fname) 116 *file = fname; 117 118 return 0; 119 } 120 121 int 122 devopen(struct open_file *f, const char *fname, char **file) 123 { 124 struct devsw *dp; 125 uint8_t unit, part; 126 int dev, error; 127 128 DPRINTF(("devopen(%s)\n", fname)); 129 130 if ((error = devparse(fname, &dev, &unit, &part, 131 (const char **)file)) != 0) 132 return error; 133 134 dp = &devsw[dev]; 135 if ((void *)dp->dv_open == (void *)nodev) 136 return ENXIO; 137 138 f->f_dev = dp; 139 140 if ((error = (*dp->dv_open)(f, unit, part)) != 0) 141 printf("%s%d%c: %d = %s\n", devsw[dev].dv_name, 142 unit, 'a' + part, error, strerror(error)); 143 144 return error; 145 } 146