Peter Wemm 9f85bc03de pmap_enter() masked off the page offset bits, pmap_kenter() did not.
This (I believe) is the cause of the XFree86 startup and/or mptable(8)
panics when programs were reading from /dev/mem at non-page-aligned
offsets.  The offsets were being converted into random page flags in the
page tables. :-(   (including PG_PS = 4MB page size)
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