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Rev Author # Line
1 perry 1 MEM
2 !!!MEM
3 NAME
4 DESCRIPTION
5 FILES
6 SEE ALSO
7 ----
8 !!NAME
9
10
11 mem, kmem, port - system memory, kernel memory and system ports
12 !!DESCRIPTION
13
14
15 __Mem__ is a character device file that is an image of
16 the main memory of the computer. It may be used, for
17 example, to examine (and even patch) the
18 system.
19
20
21 Byte addresses in mem are interpreted as physical memory
22 addresses. References to non-existent locations cause errors
23 to be returned.
24
25
26 Examining and patching is likely to lead to unexpected
27 results when read-only or write-only bits are
28 present.
29
30
31 It is typically created by:
32
33
34 mknod -m 660 /dev/mem c 1 1
35 chown root:kmem /dev/mem
36
37
38 The file kmem is the same as mem, except that the kernel
39 virtual memory rather than physical memory is
40 accessed.
41
42
43 It is typically created by:
44
45
46 mknod -m 640 /dev/kmem c 1 2
47 chown root:kmem /dev/kmem
48
49
50 __Port__ is similar to mem, but the IO ports are
51 accessed.
52
53
54 It is typically created by:
55
56
57 mknod -m 660 /dev/port c 1 4
58 chown root:mem /dev/port
59 !!FILES
60
61
62 ''/dev/mem
63 /dev/kmem
64 /dev/port''
65 !!SEE ALSO
66
67
68 chown(1), mknod(1),
69 ioperm(2)
70 ----
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