K 10
svn:author
V 6
marius
K 8
svn:date
V 27
2009-09-20T18:59:30.100155Z
K 7
svn:log
V 538
MFC: r195808

Add a MD __PCI_BAR_ZERO_VALID which denotes that BARs containing 0
actually specify valid bases that should be treated just as normal.
The PCI specifications have no indication that 0 would be a magic value
indicating a disabled BAR as commonly used on at least amd64 and i386
but not sparc64. It's unclear what to do in pci_delete_resource()
instead of writing 0 to a BAR though as there's no (other) way do
disable individual BARs so its decoding is left enabled in case of
__PCI_BAR_ZERO_VALID for now.

Approved by:	jhb

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