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.
/dev/mem
/dev/kmem
AT&T UNIX
.