MEM(4) | Device Drivers Manual (mvme68k) | MEM(4) |
mem
, kmem
—
main memory
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 manner 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.
The files mem
and
kmem
appeared in Version 6
AT&T UNIX.
November 28, 1999 | NetBSD 10.99 |