1/* $NetBSD: devopen.c,v 1.2 2011/03/06 18:22:13 phx Exp $ */
2
3/*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Tohru Nishimura.
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 <sys/param.h>
33
34#include <netinet/in.h>
35
36#include <lib/libsa/stand.h>
37#include <lib/libsa/nfs.h>
38#include <lib/libsa/ufs.h>
39#include <lib/libsa/tftp.h>
40#include <lib/libkern/libkern.h>
41
42#include "globals.h"
43#include "memfs.h"
44
45struct devsw devnet = { "net", net_strategy, net_open, net_close, noioctl };
46struct devsw devdsk = { "dsk", dsk_strategy, dsk_open, dsk_close, noioctl };
47
48struct fs_ops file_system[1] = { FS_OPS(null) };
49int nfsys = 1;
50struct fs_ops fs_nfs   = FS_OPS(nfs);
51struct fs_ops fs_tftp  = FS_OPS(tftp);
52struct fs_ops fs_ffsv2 = FS_OPS(ffsv2);
53struct fs_ops fs_ffsv1 = FS_OPS(ffsv1);
54struct fs_ops fs_mem   = FS_OPS(mem);
55
56static void parseunit(const char *, int *, int *, char **);
57
58int
59devopen(struct open_file *of, const char *name, char **file)
60{
61	int error;
62	int unit, part;
63	extern char bootfile[]; /* handed by DHCP */
64
65	if (of->f_flags != F_READ)
66		return EPERM;
67
68	if (strncmp("mem:", name, 4) == 0) {
69		of->f_dev = NULL;
70		of->f_flags |= F_NODEV;
71		file_system[0] = fs_mem;
72		*file = (char *)&name[4];
73		return 0;		/* MEM */
74	}
75	if (strncmp("net:", name, 4) == 0 || strncmp("nfs:", name, 4) == 0) {
76		of->f_dev = &devnet;
77		if ((error = net_open(of, &name[4], "nfs")) != 0)
78			return error;
79		file_system[0] = fs_nfs;
80		*file = bootfile;	/* resolved fname */
81		return 0;		/* NFS */
82	}
83	if (strncmp("tftp:", name, 5) == 0) {
84		of->f_dev = &devnet;
85		if ((error = net_open(of, &name[5], "tftp")) != 0)
86			return error;
87		file_system[0] = fs_tftp;
88		*file = bootfile;	/* resolved fname */
89		return 0;		/* TFTP */
90	}
91	if (name[0] == 'w' && name[1] == 'd') {
92		parseunit(&name[2], &unit, &part, file);
93		of->f_dev = &devdsk;
94		if (*file == NULL || **file <= ' ')
95			*file = "netbsd";
96		if ((error = dsk_open(of, unit, part, *file)) != 0)
97			return error;
98		file_system[0] = *dsk_fsops(of);
99		return 0;		/* FFS */
100	}
101	return ENOENT;
102}
103
104static void
105parseunit(const char *name, int *unitp, int *partp, char **pathp)
106{
107	const char *p = name;
108	int unit, part;
109
110	unit = part = -1;
111	while (*p != ':' && *p != '\0') {
112		if (unit == -1 && *p >= '0' && *p <= '9')
113			unit = *p - '0';
114		if (part == -1 && *p >= 'a' && *p < 'a' + 16)
115			part = *p - 'a';
116		p += 1;
117	}
118	*unitp = (unit == -1) ? 0 : unit;
119	*partp = (part == -1) ? 0 : part;
120	*pathp = (*p == ':') ? (char *)p + 1 : NULL;
121}
122
123/* ARGSUSED */
124int
125noioctl(struct open_file *f, u_long cmd, void *data)
126{
127
128	return EINVAL;
129}
130