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.

- Eric
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