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CVS log for src/doc/HACKS

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Default branch: MAIN
Current tag: netbsd-5-1-3-RELEASE


Revision 1.110.2.2.6.1 / (download) - annotate - [select for diffs], Sat Mar 17 18:46:29 2012 UTC (12 years ago) by bouyer
Branch: netbsd-5-1
CVS Tags: netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE
Changes since 1.110.2.2: +1 -13 lines
Diff to previous 1.110.2.2 (unified) next main 1.110.2.3 (unified)

Pull up following revision(s) (requested by nakayama in ticket #1736):
	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.

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