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MEM
Section: Linux Programmer's Manual (4)
Updated: 1992-11-21
Index
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NAME
mem, kmem, port - system memory, kernel memory and system ports
DESCRIPTION
mem is a character device file
that is an image of the main memory of the computer.
It may be used, for example, to examine (and even patch) the system.
Byte addresses in
mem
are interpreted as physical memory addresses.
References to nonexistent locations cause errors to be returned.
Examining and patching is likely to lead to unexpected results
when read-only or write-only bits are present.
It is typically created by:
-
mknod -m 660 /dev/mem c 1 1
chown root:kmem /dev/mem
The file
kmem
is the same as
mem,
except that the kernel virtual memory
rather than physical memory is accessed.
It is typically created by:
-
mknod -m 640 /dev/kmem c 1 2
chown root:kmem /dev/kmem
port is similar to
mem,
but the I/O ports are accessed.
It is typically created by:
-
mknod -m 660 /dev/port c 1 4
chown root:mem /dev/port
FILES
/dev/mem
/dev/kmem
/dev/port
SEE ALSO
chown(1),
mknod(1),
ioperm(2)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- DESCRIPTION
-
- FILES
-
- SEE ALSO
-
- COLOPHON
-
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