John Baldwin f252d86740 Use CPUID to see if the current CPU supports long mode when attemping to
boot an amd64 kernel.  If not, then fail the boot request with an error
message.  Otherwise, the boot attempt will fail with a BTX fault when
trying to read the EFER MSR.

MFC after:	3 days
2008-10-07 14:05:42 +00:00
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