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("$FreeBSD$");
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/memrange.h>
38#include <sys/module.h>
39#include <sys/mutex.h>
40#include <sys/proc.h>
41#include <sys/signalvar.h>
42#include <sys/systm.h>
43#include <sys/uio.h>
44
45#include <vm/vm.h>
46#include <vm/pmap.h>
47
48#include <machine/memdev.h>
49
50static struct cdev *memdev, *kmemdev;
51
52static struct cdevsw mem_cdevsw = {
53	.d_version =	D_VERSION,
54	.d_flags =	D_MEM|D_NEEDGIANT,
55	.d_open =	memopen,
56	.d_read =	memrw,
57	.d_write =	memrw,
58	.d_ioctl =	memioctl,
59	.d_mmap =	memmmap,
60	.d_name =	"mem",
61};
62
63/* ARGSUSED */
64int
65memopen(struct cdev *dev __unused, int flags, int fmt __unused,
66    struct thread *td)
67{
68	int error = 0;
69
70	if (flags & FWRITE)
71		error = securelevel_gt(td->td_ucred, 0);
72
73	return (error);
74}
75
76/* ARGSUSED */
77static int
78mem_modevent(module_t mod __unused, int type, void *data __unused)
79{
80	switch(type) {
81	case MOD_LOAD:
82		if (bootverbose)
83			printf("mem: <memory>\n");
84		mem_range_init();
85		memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
86			UID_ROOT, GID_KMEM, 0640, "mem");
87		kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
88			UID_ROOT, GID_KMEM, 0640, "kmem");
89		break;
90
91	case MOD_UNLOAD:
92		mem_range_destroy();
93		destroy_dev(memdev);
94		destroy_dev(kmemdev);
95		break;
96
97	case MOD_SHUTDOWN:
98		break;
99
100	default:
101		return(EOPNOTSUPP);
102
103	}
104
105	return (0);
106}
107
108DEV_MODULE(mem, mem_modevent, NULL);
109MODULE_VERSION(mem, 1);
110