Initial commit

code/pit_after.cpp

@@ -0,0 +1,12 @@
+void Pit::trigger(const InterruptFrame &frame) {
+    time.addNanoseconds(timerInterval); // Increase system time
+
+    // Don't use PIT for scheduling when the APIC timer is enabled
+    if (Apic::isEnabled()) {
+        return;
+    }
+
+    if (time.toMilliseconds() % yieldInterval == 0) {
+        System::getService<SchedulerService>().yield(); // Trigger preemption
+    }
+}