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Extract the logic from pmap_kextract

Description

Extract the logic from pmap_kextract

This allows us to use it when we only need to check if the virtual address
is valid. For example when checking if an address in the DMAP region is
mapped.

Reviewed by: kib, markj
Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D27621

Details

Provenance
andrewAuthored on Jan 15 2021, 6:48 PM
Reviewer
kib
Differential Revision
D27621: Extract the logic from pmap_kextract
Parents
R10:7c84a7405bee: Remove the old dts imported tree.
Branches
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Tags
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