CVS commit: src/sys/arch/amd64/amd64

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

Module Name:    src
Committed By:   maxv
Date:           Fri Dec  9 17:57:24 UTC 2016

Modified Files:
        src/sys/arch/amd64/amd64: locore.S machdep.c

Log Message:
On amd64 we try to guarantee that VA = PA + KERNBASE in the bootstrap
memory. But we have a problem with the ISA I/O MEM, because its va is
located above the kernel and its pa below it, so it does not respect
the rule.

To compensate for that we make the map look like the ISA stuff is above
the kernel by applying an offset on the pa. The issue with this design is
that we systematically lose 96 pages of physical memory.

Fix this by applying the offset on the va instead. Now these 96 pages are
internalized into uvm, and the rule is respected until kern_end.


To generate a diff of this commit:
cvs rdiff -u -r1.115 -r1.116 src/sys/arch/amd64/amd64/locore.S
cvs rdiff -u -r1.234 -r1.235 src/sys/arch/amd64/amd64/machdep.c

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