iodev.c revision 181428 
1/*-
2 * Copyright (c) 2004 Mark R V Murray
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/dev/io/iodev.c 181428 2008-08-08 13:43:56Z ed $");
30
31#include <sys/param.h>
32#include <sys/conf.h>
33#include <sys/fcntl.h>
34#include <sys/kernel.h>
35#include <sys/lock.h>
36#include <sys/malloc.h>
37#include <sys/module.h>
38#include <sys/mutex.h>
39#include <sys/proc.h>
40#include <sys/signalvar.h>
41#include <sys/systm.h>
42#include <sys/uio.h>
43
44#include <machine/specialreg.h>
45
46#include <vm/vm.h>
47#include <vm/pmap.h>
48
49#include <machine/iodev.h>
50
51static struct cdev *iodev;
52
53static struct cdevsw io_cdevsw = {
54	.d_version =	D_VERSION,
55	.d_open =	ioopen,
56	.d_close =	ioclose,
57	.d_name =	"io",
58};
59
60/* ARGSUSED */
61static int
62io_modevent(module_t mod __unused, int type, void *data __unused)
63{
64	switch(type) {
65	case MOD_LOAD:
66		if (bootverbose)
67			printf("io: <I/O>\n");
68		iodev = make_dev(&io_cdevsw, 0,
69			UID_ROOT, GID_WHEEL, 0600, "io");
70		break;
71
72	case MOD_UNLOAD:
73		destroy_dev(iodev);
74		break;
75
76	case MOD_SHUTDOWN:
77		break;
78
79	default:
80		return(EOPNOTSUPP);
81		break;
82
83	}
84
85	return (0);
86}
87
88DEV_MODULE(io, io_modevent, NULL);
89MODULE_VERSION(io, 1);
90