🚀 go-pugleaf

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There seems to be a problem with instruction restart and memory mapped I/O.,
for example, in article <blahblahblah> deraadt@enme3.UUCP(Theo Deraadt) writes:
>Gad. How about a hardware FIFO? How about a serial receive buffer on
>your generic serial chip?

If you re-execute, then you might dump something into the FIFO twice.
Or, (more likely), you'll take something out twice.

This is only because of a design practice that should be abolished, which is
side-effects upon reading. Without this mis-feature, extraneous reads do not
change state, and the problems don't occur.

Writes generally will not get re-executed anyway, since if you execute
the write, then you've sucessfully completed the instruction and you
don't have to do it again.  --
		  baum@apple.com		(408)974-3385
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