mem
, kmem
—
Sun main memory access driver
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 SPARC, physical memory may be discontiguous; kernel virtual memory begins
at 0xf0000000
.
The files mem
and kmem
appeared
in Version 6 AT&T UNIX.