kernel mapping

How come we don't use iopa() and friends for all kernel mapping
information?  It is only defined for CONFIG_APUS, but is the right
thing to use on 8xx and 4xx, and probably all processors.  The
virt_to_bus/bus_to_virt contain the quickie arithmetic hack with
KERNELBASE, but that isn't the right thing to do for any kmalloc()
or valloc() space or if you don't have BAT mapping.

I am considering making these functions more generic, removing the
#ifdefs, and implementing "simulated" BAT mapping for processors
like the 8xx and 4xx that don't have BATs (not for 2.4, of course :-).

Why shouldn't I do this?

	-- Dan

--

	I like MMUs because I don't have a real life.

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