Exception in openfirmware calling

[Andrew Turner]

I'm getting a cpu exception on the mtmsr instruction on line 213 in
ofw_machdep.c[1]. A copy of me single stepping through the code is
available at [2].

I would appreciate any incite to what is going wrong here so I can fix
it.

Andrew

[1] http://fxr.watson.org/fxr/source/powerpc/powerpc/ofw_machdep.c#L213
[2] http://fubar.geek.nz/files/efika_exception.txt