K 10
svn:author
V 3
zbb
K 8
svn:date
V 27
2015-06-09T23:54:20.740749Z
K 7
svn:log
V 429
Add options to dmb() and dsb() macros on ARM64

Using plain dsb()/dmb() as full system barriers is usually to much.
Adding proper options to those barriers (instead of full system - sy)
will most likely reduce the cost of the instructions and will benefit
in performance improvement.
This commit adds options to barrier macro definitions.

Obtained from: Semihalf
Reviewed by:   andrew, ian
Sponsored by:  The FreeBSD Foundation

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