Allocating Qbus memory space and Qbus map space

[Charles Dickman <chd%chdickman.com@localhost>]

I can't find how the kernel handles allocation of Qbus memory space.

Qbus memory space that is not used by Qbus modules is part of the Qbus
map and used for Qbus DMA mapping. Qbus memory space (a frame buffer
for example) that is used by a Qbus module must be removed from the
Qbus memory space usable for DMA.

Any thoughts on how this should be handled properly.

-chuck