K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2009-09-03T13:56:18.941886Z
K 7
svn:log
V 1013
MFC 180430, 180483, 180485, 180601, 180845, 180871-180873, 181043, 181077,
181151, 181284, 181356, 181456, 189454, 194209, 195416, 195836, 196318,
196705, and 196707:
Various fixes and enhancements to the amd64 and i386 pmaps to support PAT.
- Extend pmap_demote_pde() to include the ability to instantiate a new page
  table page where none existed before.
- Enhance pmap_change_attr() to fully support large (2/4MB) pages by
  breaking demoting them to 4KB page mappings when needed.
- Enhance pmap_change_attr() to avoid page demotions, cache mode changes,
  and cache and TLB invalidation when some or all of the specified range
  is already mapped with the specified cache mode.
- Enhance pmap_change_attr() to adjust the direct map automatically when
  changing the cache mode of a kernel virtual address range.
- Fix pmap_object_init_pt() to not assume that the pages of a OBJT_DEVICE
  object are always physically contiguous.
- Correct a critical accounting error in pmap_demote_pde().

Reviewed by:	alc

END