CVS commit: [netbsd-4] src

["Manuel Bouyer" <bouyer%netbsd.org@localhost>]

Module Name:    src
Committed By:   bouyer
Date:           Sat Mar 17 19:40:41 UTC 2012

Modified Files:
        src/doc [netbsd-4]: HACKS
        src/sys/arch/sparc64/conf [netbsd-4]: Makefile.sparc64 files.sparc64
        src/sys/arch/sparc64/sparc64 [netbsd-4]: locore.s

Log Message:
Pull up following revision(s) via patch (requested by nakayama in ticket #1443):
        sys/arch/sparc64/conf/Makefile.sparc64: revision 1.71
        doc/HACKS: revision 1.123
        sys/arch/sparc64/conf/files.sparc64: revision 1.138
        sys/arch/sparc64/sparc64/locore.s: revision 1.340
Fix the root cause of the hack "disable optimizations for uvm_bio.c
on 32 bit kernels".
gcc converts a division in the calculation of UBC_UMAP_ADDR macro
to multiplication (smul or combination of add/sll), and the
register of its result contains a garbage in upper 32 bits (the
upper 32 bits of smul/add/sll's result isn't zero cleared).
Then it passes to pseg_get{,_real} through pmap_extract without the
zero clear of upper 32 bits in the optimization case.  So the
result of pseg_get and pmap_extact sometimes gets screwed up.
The hack has been resolved in the revision 1.340 of
sys/arch/sparc64/sparc64/locore.s.


To generate a diff of this commit:
cvs rdiff -u -r1.91.2.3 -r1.91.2.4 src/doc/HACKS
cvs rdiff -u -r1.62.12.1 -r1.62.12.2 \
    src/sys/arch/sparc64/conf/Makefile.sparc64
cvs rdiff -u -r1.107 -r1.107.2.1 src/sys/arch/sparc64/conf/files.sparc64
cvs rdiff -u -r1.232.2.5 -r1.232.2.6 src/sys/arch/sparc64/sparc64/locore.s

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