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.