iodev.c revision 132956 
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 132956 2004-08-01 11:40:54Z markm $");
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_flags =	D_NEEDGIANT,
56	.d_open =	ioopen,
57	.d_close =	ioclose,
58	.d_name =	"io",
59};
60
61/* ARGSUSED */
62static int
63io_modevent(module_t mod __unused, int type, void *data __unused)
64{
65	switch(type) {
66	case MOD_LOAD:
67		if (bootverbose)
68			printf("io: <I/O>\n");
69		iodev = make_dev(&io_cdevsw, CDEV_MINOR_IO,
70			UID_ROOT, GID_WHEEL, 0600, "io");
71		break;
72
73	case MOD_UNLOAD:
74		destroy_dev(iodev);
75		break;
76
77	case MOD_SHUTDOWN:
78		break;
79
80	default:
81		return(EOPNOTSUPP);
82		break;
83
84	}
85
86	return (0);
87}
88
89DEV_MODULE(io, io_modevent, NULL);
90