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 Acorn RiscPC, A7000(+) and RC7500 systems the I/O memory space (podule space
and SuperIO) begins at physical address 0x03000000 and runs to 0x033fffff. On
the RiscPC, EASI space runs from 0x08000000 to 0x0fffffff. The per-process
data size for the current process is
UPAGES
long, and
starts at VM_MAXUSER_ADDRESS.
FILES
- /dev/mem
-
- /dev/kmem
-
HISTORY
The
mem,
kmem files appeared in
Version 6 AT&T UNIX.