kib 11969484c8 For x86, read MAXPHYADDR, defined in SDM vol 3 4.1.4 Enumeration of Paging
Features by CPUID as CPUID.80000008H:EAX[7:0], into variable cpu_maxphyaddr.

Reviewed by:	alc
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2015-01-12 07:36:25 +00:00
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