pci: 64bit bar support.
implemented pci 64bit bar support. The tricky bit is pci_update_mapping(). An OS is allowed to set the BAR such that OS can't address the area pointed by BAR. It doesn't make sense, though. In that case, don't map the BAR. Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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