CVS commit: src/sys/arch/x86/x86

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Thu Dec 28 13:46:10 UTC 2017

Modified Files:
        src/sys/arch/x86/x86: pmap.c

Log Message:
Downgrade the direct map from 1GB superpages to 2MB large pages, and
simplify. Then, map the "head" region and the kernel segments as RO instead
of RW, to kill the last place that has .text mapped as writable. It will
also allow for a greater number of possibilities when we will randomize
the direct map.

While it is true that this change theoretically reduces performance a bit,
we are more interested in correctness.


To generate a diff of this commit:
cvs rdiff -u -r1.267 -r1.268 src/sys/arch/x86/x86/pmap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.