MEM(4)               OpenBSD Programmer's Manual (MVME68K)              MEM(4)

NAME
     mem, kmem - memory files

DESCRIPTION
     The file /dev/mem is an interface to the physical memory of the computer.
     Byte offsets in this file are interpreted as physical memory addresses.
     Reading and writing this file is equivalent to reading and writing memory
     itself.  An error will be returned if an attempt is made to reference an
     offset outside of /dev/mem.

     Kernel virtual memory is accessed via the file /dev/kmem in the same man-
     ner as /dev/mem.  Only kernel virtual addresses that are currently mapped
     to memory are allowed.

     On the mvme68k, physical memory is always contiguous; kernel virtual mem-
     ory begins at 0x00000000.

     Writeability of these devices is controlled by the system securelevel(7).

FILES
     /dev/mem
     /dev/kmem

SEE ALSO
     securelevel(7)

HISTORY
     The /dev/mem and /dev/kmem files appeared in Version 6 AT&T UNIX.

OpenBSD 4.7                      May 31, 2007                                1
