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 3.44 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/.