pci: implement pci bridge filtering.
This patch implements pci bridge filtering. TODO: currently almost all the map funcions assumes filtered_size == size and addr & ~(size - 1) == addr. However with bridge filtering, they aren't always true. Teach them such cases, such that filtered_size < size and addr & (size - 1) != 0. Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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