John Baldwin 10544b0951 Implement support for RF_UNMAPPED and bus_map/unmap_resource on x86.
Add implementations of bus_map/unmap_resource to the x86 nexus driver.
Change bus_activate/deactivate_resource to honor RF_UNMAPPED and to
use bus_map/unmap_resource to create/destroy the implicit mapping when
RF_UNMAPPED is not set.

Reviewed by:	cem
Differential Revision:	https://reviews.freebsd.org/D5237
2016-05-20 18:00:10 +00:00
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