FreeBSD/Linux Kernel Cross Reference
sys/dev/mem/memdev.c
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: src/sys/dev/mem/memdev.c,v 1.3 2004/08/04 18:30:31 markm Exp $");
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 <vm/vm.h>
45 #include <vm/pmap.h>
46
47 #include <machine/memdev.h>
48
49 static struct cdev *memdev, *kmemdev;
50
51 static struct cdevsw mem_cdevsw = {
52 .d_version = D_VERSION,
53 .d_flags = D_MEM|D_NEEDGIANT,
54 .d_open = memopen,
55 .d_read = memrw,
56 .d_write = memrw,
57 .d_ioctl = memioctl,
58 .d_mmap = memmmap,
59 .d_name = "mem",
60 };
61
62 /* ARGSUSED */
63 int
64 memopen(struct cdev *dev __unused, int flags, int fmt __unused,
65 struct thread *td)
66 {
67 int error = 0;
68
69 if (flags & FWRITE)
70 error = securelevel_gt(td->td_ucred, 0);
71
72 return (error);
73 }
74
75 /* ARGSUSED */
76 static int
77 mem_modevent(module_t mod __unused, int type, void *data __unused)
78 {
79 switch(type) {
80 case MOD_LOAD:
81 if (bootverbose)
82 printf("mem: <memory>\n");
83 dev_mem_md_init(); /* Machine dependant bit */
84 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
85 UID_ROOT, GID_KMEM, 0640, "mem");
86 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
87 UID_ROOT, GID_KMEM, 0640, "kmem");
88 break;
89
90 case MOD_UNLOAD:
91 destroy_dev(memdev);
92 destroy_dev(kmemdev);
93 break;
94
95 case MOD_SHUTDOWN:
96 break;
97
98 default:
99 return(EOPNOTSUPP);
100
101 }
102
103 return (0);
104 }
105
106 DEV_MODULE(mem, mem_modevent, NULL);
107 MODULE_VERSION(mem, 1);
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