1/*	$NetBSD: devopen.c,v 1.7 2016/06/26 04:17:17 isaki Exp $	*/
2
3/*
4 * Copyright (c) 2001 Minoura Makoto
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/param.h>
30#include <sys/disklabel.h>
31#include <machine/bootinfo.h>
32#include <lib/libkern/libkern.h>
33#include <lib/libsa/stand.h>
34#include "libx68k.h"
35
36extern struct devspec devspec[]; /* defined in conf.c */
37int devopen_open_dir = 0;
38
39/*
40 * Parse a device spec.
41 *
42 * [ha@]<dev><unit><part>:<file>
43 *  ha   - host adaptor ("spc0", "spc1", "mha0")
44 *  dev  - device name (e.g., "sd")
45 *  unit - 0-7
46 *  part - a-p
47 */
48int
49devparse(const char *fname, int *ha, int *dev, int *unit, int *part,
50	char **file)
51{
52	char const *s;
53	int i;
54
55	s = fname;
56
57	if (strncmp(s, "spc0@", 5) == 0) {
58		*ha = (X68K_BOOT_SCSIIF_SPC << 4) | 0;
59		s += 5;
60	} else if (strncmp(s, "spc1@", 5) == 0) {
61		*ha = (X68K_BOOT_SCSIIF_SPC << 4) | 1;
62		s += 5;
63	} else if (strncmp(s, "mha0@", 5) == 0) {
64		*ha = (X68K_BOOT_SCSIIF_MHA << 4) | 0;
65		s += 5;
66	} else {
67		*ha = 0;
68	}
69
70	for (i = 0; devspec[i].ds_name != 0; i++) {
71		if (strncmp (devspec[i].ds_name, s,
72			     strlen(devspec[i].ds_name)) == 0)
73			break;
74	}
75
76	if (devspec[i].ds_name == 0)
77		return ENODEV;
78	s += strlen(devspec[i].ds_name);
79	*dev = devspec[i].ds_dev;
80
81	if (devspec[i].ds_net) {
82		*unit = 0;
83		*part = 0;
84	} else {
85		*unit = *s++ - '0';
86		if (*unit < 0 || *unit > devspec[i].ds_maxunit)
87			/* bad unit */
88			return ENODEV;
89		*part = *s++ - 'a';
90		if (*part < 0 || *part > MAXPARTITIONS)
91			/* bad partition */
92			return ENODEV;
93	}
94
95	if (*s++ != ':')
96		return ENODEV;
97
98	if (*s == '/') {
99		s++;
100		if (devopen_open_dir && *s == 0)
101			s--;
102	}
103	*file = __UNCONST(s);
104
105	return 0;
106}
107
108int
109devopen(struct open_file *f, const char *fname, char **file)
110{
111	int error;
112	int ha, dev, unit, part;
113	struct devsw *dp = &devsw[0];
114
115	error = devparse(fname, &ha, &dev, &unit, &part, file);
116	if (error)
117		return error;
118
119	dp = &devsw[dev];
120
121	if (dp->dv_open == NULL)
122		return ENODEV;
123
124	f->f_dev = dp;
125
126	if ((error = (*dp->dv_open)(f, unit, part)) == 0)
127		return 0;
128
129	return error;
130}
131