Routing interrupts to different handlers in runtime

[elrafoon]

Recently on NRF52832 I needed to route interrupt to one of two handlers - buffered uart driver, unbuffered uart driver - depending on program state.

I came up up with this solution:

static UARTE0_UART_IRQ_TARGET: AtomicBool = AtomicBool::new(false);

struct Uarte0Uart0Irq {}

unsafe impl
    typelevel::Binding<typelevel::UARTE0_UART0, uarte::InterruptHandler<peripherals::UARTE0>>
    for Uarte0Uart0Irq
{
}

unsafe impl
    typelevel::Binding<
        typelevel::UARTE0_UART0,
        buffered_uarte::InterruptHandler<peripherals::UARTE0>,
    > for Uarte0Uart0Irq
{
}

#[allow(non_snake_case)]
#[no_mangle]
unsafe extern "C" fn UARTE0_UART0() {
    if UARTE0_UART_IRQ_TARGET.load(atomic::Ordering::SeqCst) {
        buffered_uarte::InterruptHandler::<peripherals::UARTE0>::on_interrupt()
    } else {
        uarte::InterruptHandler::<peripherals::UARTE0>::on_interrupt()
    }
}

This works good, but it's quite large and ugly code.
Maybe I'm completely missing some already available abstraction.

Could it be replaced with something more elegant?