View Source: port(4) - Waikato Linux Users Group

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MEM
!!!MEM
NAME
DESCRIPTION
FILES
SEE ALSO
----
!!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 non-existent 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 IO 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)
----

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Man4p

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Last edited on Tuesday, June 4, 2002 12:25:04 am by "perry"

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