static void vfio_probe_ati_bar4_quirk(VFIOPCIDevice *vdev, int nr)

{

    VFIOQuirk *quirk;

    VFIOConfigWindowQuirk *window;



    /* This windows doesn't seem to be used except by legacy VGA code */

    if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) ||

        !vdev->has_vga || nr != 4) {

        return;

    }



    quirk = g_malloc0(sizeof(*quirk));

    quirk->mem = g_new0(MemoryRegion, 2);

    quirk->nr_mem = 2;

    window = quirk->data = g_malloc0(sizeof(*window) +

                                     sizeof(VFIOConfigWindowMatch));

    window->vdev = vdev;

    window->address_offset = 0;

    window->data_offset = 4;

    window->nr_matches = 1;

    window->matches[0].match = 0x4000;

    window->matches[0].mask = PCIE_CONFIG_SPACE_SIZE - 1;

    window->bar = nr;

    window->addr_mem = &quirk->mem[0];

    window->data_mem = &quirk->mem[1];



    memory_region_init_io(window->addr_mem, OBJECT(vdev),

                          &vfio_generic_window_address_quirk, window,

                          "vfio-ati-bar4-window-address-quirk", 4);

    memory_region_add_subregion_overlap(&vdev->bars[nr].region.mem,

                                        window->address_offset,

                                        window->addr_mem, 1);



    memory_region_init_io(window->data_mem, OBJECT(vdev),

                          &vfio_generic_window_data_quirk, window,

                          "vfio-ati-bar4-window-data-quirk", 4);

    memory_region_add_subregion_overlap(&vdev->bars[nr].region.mem,

                                        window->data_offset,

                                        window->data_mem, 1);



    QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);



    trace_vfio_quirk_ati_bar4_probe(vdev->vbasedev.name);

}
