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From: Marcel Moolenaar <marcel@FreeBSD.org>
Date: Sat, 16 Jul 2011 20:34:02 +0000 (UTC)
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Subject: cvs commit: src/sys/ia64/ia64 pmap.c
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marcel      2011-07-16 20:34:02 UTC

  FreeBSD src repository

  Modified files:
    sys/ia64/ia64        pmap.c 
  Log:
  SVN rev 224116 on 2011-07-16 20:34:02Z by marcel
  
  Don't assume pmap_mapdev() gets called only for memory mapped I/O
  addresses (i.e. uncacheable). ACPI in particular uses pmap_mapdev()
  rather excessively (number of calls) just to get a valid KVA. To
  that end, have pmap_mapdev():
  1.  cache the last result so that we don't waste time for multiple
      consecutive invocations with the same PA/SZ.
  2.  find the memory descriptor that covers the PA and return NULL
      if none was found or when the PA is for a common DRAM address.
  3.  Use either a region 6 or region 7 KVA, in accordance with the
      memory attribute.
  
  Revision  Changes    Path
  1.236     +29 -3     src/sys/ia64/ia64/pmap.c