machine check exception

[David K Altobelli]

Also,  we were planning on adding check-exception logic to the machine
check
handler to retrieve error information from RTAS (for non-FWNMI machines).
This has a dependency on being able to log fatal errors to nvram and
recover on
next reboot.

 > Paul just reminded me that we should probably be doing
> rtas check-exception when we get a machine check.
> I assume this isnt required on a machine with FWNMI
> since it does the work for us, right?


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