Detangling the ppbus/ppc interrupt stuff..

[John Baldwin]

So I have a patch to try and straighten out the ppbus/ppc interrupt stuff a 
bit.  Rather than passing IRQ numbers around as ivars, etc., ppc is smart 
enough to let child devices ask for SYS_RES_IRQ rid 0 and let them use its 
assigned IRQ resource.  It then uses an interrupt event to mange the list of 
child interrupt handlers which it invokes from its own interrupt handler.  I 
don't currently have any boxes running HEAD that have anything hooked up to 
their ppc0 port, so I'd appreciate folks testing this if possible.

http://www.FreeBSD.org/~jhb/patches/ppc_intr.patch

-- 
John Baldwin
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