dcbz works on 862 everywhere!

[Till Straumann]

Hi guys.

I revitalized my old test environment on a
mpc860t (XPC860TZP50B5 / 3J21M to be precise).

I found that 'dcbz' (while failing to set DAR)
indeed sets MD_EPN correctly. Hence, Jocke's fix
(copy EPN[0:19]->DAR) would handle that.

My older idea (fixing up MD_EPN and DAR based
on the faulting instruction opcode and the involved
GPR contents) should work even if we have neither
a valid MD_EPN nor DAR.

-- Till.


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