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/// Shutdown the whole system (in QEMU), including all CPUs.
///
/// See <https://wiki.osdev.org/Shutdown> for more information.
pub fn terminate() -> ! {
    info!("Shutting down...");

    #[cfg(platform = "x86_64-pc-oslab")]
    {
        axlog::ax_println!("System will reboot, press any key to continue ...");
        while super::console::getchar().is_none() {}
        axlog::ax_println!("Rebooting ...");
        unsafe { x86_64::instructions::port::PortWriteOnly::new(0x64).write(0xfeu8) };
    }

    #[cfg(platform = "x86_64-qemu-q35")]
    unsafe {
        x86_64::instructions::port::PortWriteOnly::new(0x604).write(0x2000u16)
    };

    crate::arch::halt();
    warn!("It should shutdown!");
    loop {
        crate::arch::halt();
    }
}