mem(4) - NetBSD Manual Pages

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MEM(4)              NetBSD/mvme68k Kernel Interfaces Manual             MEM(4)


NAME

     mem, kmem -- main memory


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 Motorola MVME series of single board computers, physical memory
     may be discontiguous; kernel virtual memory begins at 0x00008000.


FILES

     /dev/mem
     /dev/kmem


HISTORY

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

NetBSD 4.0                     November 28, 1999                    NetBSD 4.0