fw_cfg: expose control register size in fw_cfg.h
Expose the size of the control register (FW_CFG_CTL_SIZE) in fw_cfg.h. Add comment to fw_cfg_io_realize() pointing out that since the 8-bit data register is always subsumed by the 16-bit control register in the port I/O case, we use the control register width as the *total* width of the (classic, non-DMA) port I/O region reserved for the device. Cc: Marc Marí <markmb@redhat.com> Signed-off-by: NGabriel Somlo <somlo@cmu.edu> Reviewed-by: NLaszlo Ersek <lersek@redhat.com> Reviewed-by: NMarc Marí <markmb@redhat.com> Message-id: 1455906029-25565-2-git-send-email-somlo@cmu.edu Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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