interrupt-handling-using-the-x86-apic/code/apictimer_trigger.cpp

// Excerpt from the APIC timer interrupt handler
void ApicTimer::trigger(const InterruptFrame &frame) {
    if (cpuId != LocalApic::getId()) {
        // Abort if the handler doesn't belong to the current CPU
        return;
    }

    // Increase the "core-local" time
    time.addNanoseconds(timerInterval * 1'000'000); // Interval is in milliseconds
}