Import the "gerbert" kernel I worked on earlier this year.

It's a lot crappier than I remembered it. It's gonna need a lot of work.

Kernel/i8253.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#define TICKS_PER_SECOND          600
+
+namespace PIT {
+
+void initialize();
+
+}