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/PIC.h

@@ -0,0 +1,19 @@
+#pragma once
+
+namespace PIC {
+
+void enable(BYTE number);
+void disable(BYTE number);
+void eoi(BYTE number);
+void initialize();
+
+}
+
+class IRQHandlerScope {
+public:
+    explicit IRQHandlerScope(BYTE irq) : m_irq(irq) { }
+    ~IRQHandlerScope() { PIC::eoi(m_irq); }
+
+private:
+    BYTE m_irq { 0 };
+};