pub unsafe extern "C" fn zx_vmar_map_iob(
handle: zx_handle_t,
options: zx_vm_option_t,
vmar_offset: usize,
ep: zx_handle_t,
region_index: u32,
region_offset: u64,
region_length: usize,
mapped_addr: *mut zx_vaddr_t,
) -> zx_status_t