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From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 9 Jun 2009 13:44:17 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/acpica acpi_pcib_acpi.c
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jhb         2009-06-09 13:44:17 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/acpica       acpi_pcib_acpi.c 
  Log:
  SVN rev 193829 on 2009-06-09 13:44:17Z by jhb
  
  Rework the _BBN handling for Host-PCI bridges.  Previously we only trusted
  a _BBN value of 0 if it was for the first bridge encountered since some
  older systems returned _BBN of 0 for all bridges.  However, some newer
  systems enumerate bridges with non-zero _BBN before bus 0 which is
  perfectly valid.  Handle both cases by trusting the first bridge that has
  a _BBN of 0 and falling back to reading from non-standard config registers
  only for subsequent bridges with a _BBN of 0.  We also only perform this
  check for segment (domain) 0.  We assume that _BBN is always correct
  for segments other than 0.
  
  Tested by:      Josef Moellers  josef.moellers at fujitsu
  MFC after:      1 week
  
  Revision  Changes    Path
  1.58      +25 -18    src/sys/dev/acpica/acpi_pcib_acpi.c