>AAACK!  I _already_, some months ago, posted what the API for this
>should look like.
>
>Please search the tech-kern archives for "bus_space_mmap".

umm... in December, you posted
<199812150349.TAA26079@lestat.nas.nasa.gov>, in answer to a query re
machine_btop(), saying that your bus_space_mmap() proposal was not yet
complete.  

The next mention of bus_space_mmap() is a reply to that message.
The next-but-one is your text above.

Are you sure that's where you posted it?  I've been bugging various
lists about this on and off for what, two years now, i hope I'd have
noticed...