2 * Copyright (c) 2004 Mark R V Murray
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
33 #include <sys/fcntl.h>
34 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/memrange.h>
38 #include <sys/module.h>
39 #include <sys/mutex.h>
42 #include <sys/signalvar.h>
43 #include <sys/systm.h>
49 #include <machine/memdev.h>
51 static struct cdev *memdev, *kmemdev;
53 static struct cdevsw mem_cdevsw = {
54 .d_version = D_VERSION,
66 memopen(struct cdev *dev __unused, int flags, int fmt __unused,
72 error = priv_check(td, PRIV_KMEM_READ);
75 error = priv_check(td, PRIV_KMEM_WRITE);
77 error = securelevel_gt(td->td_ucred, 0);
85 mem_modevent(module_t mod __unused, int type, void *data __unused)
90 printf("mem: <memory>\n");
92 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
93 UID_ROOT, GID_KMEM, 0640, "mem");
94 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
95 UID_ROOT, GID_KMEM, 0640, "kmem");
101 destroy_dev(kmemdev);
115 DEV_MODULE(mem, mem_modevent, NULL);
116 MODULE_VERSION(mem, 1);