K 10
svn:author
V 6
andrew
K 8
svn:date
V 27
2016-08-12T10:29:34.741303Z
K 7
svn:log
V 586
Implement promotions and demotions in the arm64 pmap code. For now we don't
promote memory as I am not sure all the demotion cases are handled, however
it is useful to implement pmap_page_set_memattr. This is used, for example,
when mapping uncached memory for bus_dma(9).

pmap_page_set_memattr needs to demote the DMAP region as on ARM we need to
ensure all mappings to the same physical address have the same attributes.

Reviewed by:	kib
Obtained from:	ABT Systems Ltd
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D6987

END