A fix for smp old world macs such as the 9500MP and 9600MP which lack the

/cpus openfirmware node of the new world macs, and only have one cpu node.
We look at a register of the memory controller called hammerhead for the
arbitration bit being set indicating a two way machine. Quad processor
old worlds made by e.g. Daystar Digital would require a different heurisitic.
This heuristic comes from linux/netbsd.

ok kettenis@ and drahn@

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