2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004 Mark R V Murray
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
35 #include <sys/fcntl.h>
36 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/memrange.h>
40 #include <sys/module.h>
41 #include <sys/mutex.h>
44 #include <sys/signalvar.h>
45 #include <sys/systm.h>
51 #include <machine/memdev.h>
53 static struct cdev *memdev, *kmemdev;
55 static struct cdevsw mem_cdevsw = {
56 .d_version = D_VERSION,
68 memopen(struct cdev *dev __unused, int flags, int fmt __unused,
74 error = priv_check(td, PRIV_KMEM_READ);
77 error = priv_check(td, PRIV_KMEM_WRITE);
79 error = securelevel_gt(td->td_ucred, 0);
87 mem_modevent(module_t mod __unused, int type, void *data __unused)
92 printf("mem: <memory>\n");
94 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
95 UID_ROOT, GID_KMEM, 0640, "mem");
96 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
97 UID_ROOT, GID_KMEM, 0640, "kmem");
103 destroy_dev(kmemdev);
117 DEV_MODULE(mem, mem_modevent, NULL);
118 MODULE_VERSION(mem, 1);