phys \- allow a process to access physical addresses
.B phys(segreg, size, physadr)
specifies a process virtual (data-space) address
range of 8K bytes starting
This address range is mapped into
bytes of this mapping is addressable.
any previous mapping of this
virtual address range is nullified.
will map virtual addresses 0160000-0160077 into
physical addresses 017777500-017777577.
virtual address 0160060 is the PDP-11 console
located at physical address 017777560.
This call may only be executed by the super-user.
PDP-11 segmentation hardware
The function value zero is returned if
the physical mapping is in effect.
The value \-1 is returned
is not in the range 0-127,
is already used for other than
This system call is obviously very machine
dependent and very dangerous.
This system call is not considered
a permanent part of the system.
.B sys phys; segreg; size; physadr