CVS commit: src/sys/arch/powerpc/ibm4xx

["Rin Okuyama" <rin%netbsd.org@localhost>]

Module Name:    src
Committed By:   rin
Date:           Thu Sep 10 04:31:55 UTC 2020

Modified Files:
        src/sys/arch/powerpc/ibm4xx: pmap.c

Log Message:
Real fix for pmap_procwr(), attempted in revs 1.85 and 1.87:
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/powerpc/ibm4xx/pmap.c#rev1.85
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/powerpc/ibm4xx/pmap.c#rev1.87

ibm4xx has VIPT icache and operations in pmap_procwr() should be done with
DMMU enabled (write back dcache into memory and invalidate icache).

When p == curproc, this is trivial. However, p != curproc needs a special
care; we cannot rely upon TLB miss handler in user context. Therefore,
extract pa and operate against it.

Note that va below VM_MIN_KERNEL_ADDRESS (== 2GB at the moment) is reserved
for direct mapping.

Tested by gdb with WIP software single stepping for ibm4xx.


To generate a diff of this commit:
cvs rdiff -u -r1.93 -r1.94 src/sys/arch/powerpc/ibm4xx/pmap.c

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