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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Wed, 22 Jul 2009 14:32:38 +0000 (UTC)
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Subject: cvs commit: src/sys/amd64/amd64 initcpu.c pmap.c
 src/sys/amd64/include cpufunc.h md_var.h
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kib         2009-07-22 14:32:38 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      initcpu.c pmap.c 
    sys/amd64/include    cpufunc.h md_var.h 
  Log:
  SVN rev 195820 on 2009-07-22 14:32:38Z by kib
  
  When the page caching attributes are changed, after new mapping is
  established, OS shall flush the caches on all processors that may have
  used the mapping previously. This operation is not needed if processors
  support self-snooping. If not, but clflush instruction is implemented
  on the CPU, series of the clflush can be used on the mapping region.
  Otherwise, we have to flush the whole cache. The later operation is very
  expensive, and AMD-made CPUs do not have self-snooping.
  
  Implement cache flush for remapped region by using clflush for amd64,
  when supported by CPU.
  
  Proposed and reviewed by:       alc
  Approved by:    re (kensmith)
  
  Revision  Changes    Path
  1.54      +9 -0      src/sys/amd64/amd64/initcpu.c
  1.666     +42 -14    src/sys/amd64/amd64/pmap.c
  1.154     +14 -0     src/sys/amd64/include/cpufunc.h
  1.86      +1 -0      src/sys/amd64/include/md_var.h