1 /* $NetBSD: devopen.c,v 1.1 2011/03/03 05:59:37 kiyohara 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
devparse(const char * fname,int * dev,uint8_t * unit,uint8_t * part,const char ** file)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 /* parse [disk][unit][part] (ex. wd0a) strings */
78 if (!isnum(fname[i]))
79 return EUNIT;
80
81 /* device number */
82 for (u = 0; isnum(fname[i]) && (i < devlen); i++)
83 u = u * 10 + (fname[i] - '0');
84
85 if (!isalpha(fname[i]))
86 return EPART;
87
88 /* partition number */
89 p = 0;
90 if (i < devlen)
91 p = fname[i++] - 'a';
92
93 if (i != devlen)
94 return ENXIO;
95
96 /* check device name */
97 for (dp = devsw, i = 0; i < ndevs; dp++, i++) {
98 if (dp->dv_name && !strcmp(devname, dp->dv_name))
99 break;
100 }
101
102 if (i >= ndevs)
103 return ENXIO;
104
105 *unit = u;
106 *part = p;
107 *dev = i;
108 fname = ++col;
109 }
110
111 if (*fname)
112 *file = fname;
113
114 return 0;
115 }
116
117 int
devopen(struct open_file * f,const char * fname,char ** file)118 devopen(struct open_file *f, const char *fname, char **file)
119 {
120 struct devsw *dp;
121 uint8_t unit, part;
122 int dev, error;
123
124 DPRINTF(("devopen(%s)\n", fname));
125
126 if ((error = devparse(fname, &dev, &unit, &part,
127 (const char **)file)) != 0)
128 return error;
129
130 dp = &devsw[dev];
131 if ((void *)dp->dv_open == (void *)nodev)
132 return ENXIO;
133
134 f->f_dev = dp;
135
136 if ((error = (*dp->dv_open)(f, unit, part)) != 0)
137 printf("%s%d%c: %d = %s\n", devsw[dev].dv_name,
138 unit, 'a' + part, error, strerror(error));
139
140 return error;
141 }
142