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
R 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
R 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
ČLÁNKY DO MAILU