NAME
mem,
kmem —
memory
files
DESCRIPTION
The special 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. Only offsets within the bounds of
/dev/mem are allowed.
Kernel virtual memory is accessed through the interface
/dev/kmem in the same manner as
/dev/mem.
Only kernel virtual addresses that are currently mapped to memory are allowed.
On ISA the I/O memory space begins at physical address 0x000a0000 and runs to
0x00100000. The per-process data size for the current process is
UPAGES
long, and ends at virtual address 0xfe000000.
FILES
- /dev/mem
-
- /dev/kmem
-
HISTORY
The
mem,
kmem files appeared in
Version 6 AT&T UNIX.