page_to_phys
page_to_phys(virt_to_page(fbi->screen_buffer));
page_to_phys(page) & obj_do_bit17_swizzling,
page_to_phys(page) & obj_do_bit17_swizzling,
char new_bit_17 = page_to_phys(page) >> 17;
if (page_to_phys(page) & (1 << 17))