Alan Cox
92ababa777
[1] According to the x86 architectural specifications, no virtual-to- ...
physical page mapping should span two or more MTRRs of different types.
Add a pmap function, pmap_demote_DMAP(), by which the MTRR module can
ensure that the direct map region doesn't have such a mapping.
[2] Fix a couple of nearby style errors in amd64_mrset().
[3] Re-enable the use of 1GB page mappings for implementing the direct
map. (See also r197580 and r213897.)
Tested by: kib@ on a Westmere-family processor [3]
MFC after: 3 weeks
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92ababa777