Andrew Turner 4bb409fb8d Add a framework to install CPU errata on arm64. Each erratum can encode
a mask and value to compare with the Main ID Register. If these match then a
function is called to handle the installation of the erratum workaround.

No errata are currently handled, however this will change soon in a future
commit.

MFC after:	1 week
Sponsored by:	DARPA, AFRL
2018-01-09 14:33:05 +00:00
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