On Wed 03/22/06 at 15:07 PM, [EMAIL PROTECTED] wrote:
> XHAT is a giant kludge which was created for the Zulu graphics driver, 
> which is its only consumer. The Zulu device was created back when Sun was 
> still trying to do their own graphics cards :) and it was special because 
> it had a full-blown MMU onboard. XHAT allowed it to directly access the 
> kernel's virtual to physical mappings in a safe manner, which can't be 
> done through the usual methods like the DDI.

To which I would add: please don't use it.  Someday the hardware will be
EOLed, allowing us to excise XHAT - assuming it doesn't pick up any
consumers before then.
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