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From: Rafal Jaworowski <raj@FreeBSD.org>
Date: Sun, 7 Feb 2010 20:48:57 +0000 (UTC)
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Subject: cvs commit: src/sys/arm/arm pmap.c
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raj         2010-02-07 20:48:57 UTC

  FreeBSD src repository

  Modified files:
    sys/arm/arm          pmap.c 
  Log:
  SVN rev 203637 on 2010-02-07 20:48:57Z by raj
  
  Improve checking whether an ARM VA has a valid mapping before performing cache
  sync.
  
  VIPT/PIPT caches need valid VA-PA mapping in PTE for a cache operation to
  succeed (unlike VIVT). Prior to this fix pmap was using l2pte_valid() for that
  check, but this is not sufficient as the function merely checks if a PTE
  exists (there can be existing but _invalid_ entries in the table).
  
  A new pmap_has_valid_mapping() routine is introduced to do this job right by
  checking proper PTE flags.
  
  Among other potential problems this cures coherency issues with L2 caches on
  MV-78100.
  
  Submitted by:   Grzegorz Bernacki, Piotr Ziecik
  Reviewed, tested by:    marcel
  Obtained from:  Semihalf
  MFC after:      1 week
  
  Revision  Changes    Path
  1.117     +43 -75    src/sys/arm/arm/pmap.c