ppc64 kernel dumps

[Justin Hibbits]

Attached is my work on ppc64 kernel dumps, based on my ppc32 dump code
(stolen from booke).  There is one problem that I see, but I can't figure
out how to solve, which is that on my machine at least, after some number
of chunks dumped, the ATA transfer times out, failing the dump.  I think it
wedges the DMA controller, but I'm not certain.  Maybe Nathan, or someone
else, can shed some light on it.

- Justin
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