Re: Userland emulator

[Anders Magnusson <ragge%ludd.ltu.se@localhost>]

On 03/26/2013 12:45 AM, Johnny Billquist wrote:
> The VVAX (Virtual VAX) addes three instructions (WAIT, PROBEVMR and 
> PROBEVMW), adds one bit to the PSL (telling it's executing in virtual 
> mode), and changes the behaviour of a lot of stuff if you are in 
> virtual mode, as well as having a fake PSL for the virtual machine.
The wait instruction should maybe be added to the idle loop in NetBSD to 
help emulators know when the machine
is idling.  On real hardware it do not matter whether takes fault while 
doing nothing anyway :-)

-- Ragge