1 /* $NetBSD: devopen.c,v 1.2 2012/01/18 23:12:21 nonaka Exp $ */
2
3 /*-
4 * Copyright (c) 1993 John Brezak
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
27 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/param.h>
32 #include <sys/disklabel.h>
33
34 #include "boot.h"
35 #include "bootinfo.h"
36 #include "disk.h"
37 #include "unixdev.h"
38
39 static int dev2bios(char *devname, unsigned int unit, int *biosdev);
40 static int devlookup(char *d);
41
42 static int
dev2bios(char * devname,unsigned int unit,int * biosdev)43 dev2bios(char *devname, unsigned int unit, int *biosdev)
44 {
45
46 if (strcmp(devname, devname_hd) == 0) {
47 *biosdev = 0x80 + unit;
48 return 0;
49 } else if (strcmp(devname, devname_mmcd) == 0) {
50 *biosdev = 0x00 + unit;
51 return 0;
52 }
53 return ENXIO;
54 }
55
56 static int
devlookup(char * d)57 devlookup(char *d)
58 {
59 struct devsw *dp = devsw;
60 int i;
61
62 for (i = 0; i < ndevs; i++, dp++) {
63 if ((dp->dv_name != NULL) && (strcmp(dp->dv_name, d) == 0)) {
64 return i;
65 }
66 }
67
68 printf("No such device - Configured devices are:\n");
69 for (dp = devsw, i = 0; i < ndevs; i++, dp++) {
70 if (dp->dv_name != NULL) {
71 printf(" %s", dp->dv_name);
72 }
73 }
74 printf("\n");
75 return -1;
76 }
77
78 int
devopen(struct open_file * f,const char * fname,char ** file)79 devopen(struct open_file *f, const char *fname, char **file)
80 {
81 struct devsw *dp;
82 char *fsname, *devname;
83 u_int dev, unit, partition;
84 int biosdev;
85 int error;
86
87 #if defined(UNIX_DEBUG)
88 printf("devopen: fname = %s\n", fname ? fname : "(null)");
89 #endif
90
91 if ((error = parsebootfile(fname, &fsname, &devname, &unit, &partition,
92 (const char **)file)) != 0) {
93 return error;
94 }
95
96 #if defined(UNIX_DEBUG)
97 printf("devopen: devname = %s\n", devname);
98 #endif
99 dev = devlookup(devname);
100 if (dev == -1) {
101 #if defined(UNIX_DEBUG)
102 printf("devopen: devlookup failed\n");
103 #endif
104 return ENXIO;
105 }
106
107 dp = &devsw[dev];
108 if (dp->dv_open == NULL) {
109 #if defined(UNIX_DEBUG)
110 printf("devopen: dev->dv_open() == NULL\n");
111 #endif
112 return ENODEV;
113 }
114 f->f_dev = dp;
115
116 if (dev2bios(devname, unit, &biosdev) == 0) {
117 #if defined(UNIX_DEBUG)
118 printf("devopen: bios disk\n");
119 #endif
120 return unixopen(f, devname, unit, partition, *file);
121 }
122
123 #if defined(UNIX_DEBUG)
124 printf("devopen: dev->dv_open()\n");
125 #endif
126 if ((error = (*dp->dv_open)(f, devname, unit, partition, *file)) == 0) {
127 #if defined(UNIX_DEBUG)
128 printf("devopen: dev->dv_open() opened\n");
129 #endif
130 return 0;
131 }
132
133 printf("%s%d%c:%s : %s\n", dp->dv_name, unit, partition + 'a', *file,
134 strerror(error));
135 return error;
136 }
137