Implement fw_cfg DMA interface
Based on the specifications on docs/specs/fw_cfg.txt This interface is an addon. The old interface can still be used as usual. Based on Gerd Hoffman's initial implementation. Signed-off-by: NMarc Marí <markmb@redhat.com> Reviewed-by: NLaszlo Ersek <lersek@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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