K 10
svn:author
V 3
jmg
K 8
svn:date
V 27
2014-06-12T16:31:15.592027Z
K 7
svn:log
V 235
clear the write bit...   This allows my AVILA board to survive a
portsnap extract, where previously it would panic..  clearly someone
who knows pmap should optimize this code per alc's comment...

Submitted by:	alc
MFC after:	probably

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