neel baa3b938e5 Implement "special mask mode" in vatpic.
OpenBSD guests always enable "special mask mode" during boot. As a result of
r275952 this is flagged as an error and the guest cannot boot.

Reviewed by:	grehan
Differential Revision:	https://reviews.freebsd.org/D1384
MFC after:	1 week
2014-12-28 00:53:52 +00:00
..
2014-07-23 15:53:29 +00:00