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/// use sbi call to set timer
pub fn set_timer(timer: usize) {
    sbi_rt::set_timer(timer as _);
}

/// use sbi call to shutdown the kernel
pub fn shutdown(failure: bool) -> ! {
    use sbi_rt::{system_reset, NoReason, Shutdown, SystemFailure};
    if !failure {
        system_reset(Shutdown, NoReason);
    } else {
        system_reset(Shutdown, SystemFailure);
    }
    unreachable!()
}