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