Initial commit

code/apictimer_calibrate.cpp

@@ -0,0 +1,11 @@
+// Excerpt from the ApicTimer::calibrate function
+uint32_t ApicTimer::calibrate() {
+    // Start the timer with a large counter
+    LocalApic::writeDoubleWord(LocalApic::TIMER_INITIAL, 0xFFFFFFFF);
+
+    // Wait a little
+    Pit::earlyDelay(10'000);
+
+    // Calculate how often the timer ticked in one millisecond
+    return (0xFFFFFFFF - LocalApic::readDoubleWord(LocalApic::TIMER_CURRENT)) / 10;
+}