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 manner as
/dev/mem. Only kernel virtual addresses
that are currently mapped to memory are allowed.
HP300
On the HP300, the last byte of physical memory is always
0xFFFFFFFF
. Therefore, on an HP300 with 8MB of memory,
physical memory would start at
0xFF800000
. On the
HP300, kernel virtual memory runs from
0
to about
0x2400000
.
FILES
- /dev/mem
-
- /dev/kmem
-
HISTORY
The files
mem and
kmem appeared in
Version 6 AT&T UNIX.