vga-pci: add qext region to mmio
Add a qemu extented register range to the standard vga mmio bar. Right nowe there are two registers: One readonly register returning the size of the region (so we can easily add more registers there if needed) and one endian control register, so guests (especially ppc) can flip the framebuffer endianness as they need it. Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au>
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