Kernel: Rework interrupt mechanism

All interruptrable classes now inherit from Interruptable which
has methdo handle_irq which is called on a interrupt.

kernel/include/kernel/Terminal/Serial.h

@@ -1,6 +1,8 @@
 #pragma once
 
+#include <BAN/CircularQueue.h>
 #include <BAN/Errors.h>
+#include <kernel/InterruptController.h>
 #include <kernel/Terminal/TTY.h>
 
 namespace Kernel
@@ -34,7 +36,7 @@ namespace Kernel
 		uint32_t m_height { 0 };
 	};
 
-	class SerialTTY final : public TTY
+	class SerialTTY final : public TTY, public Interruptable
 	{
 	public:
 		static BAN::ErrorOr<BAN::RefPtr<SerialTTY>> create(Serial);
@@ -45,6 +47,8 @@ namespace Kernel
 
 		virtual void update() override;
 
+		virtual void handle_irq() override;
+
 	protected:
 		virtual BAN::StringView name() const override { return m_name; }
 
@@ -55,6 +59,7 @@ namespace Kernel
 	private:
 		BAN::String m_name;
 		Serial m_serial;
+		BAN::CircularQueue<uint8_t, 128> m_input;
 
 	public:
 		virtual dev_t rdev() const override { return m_rdev; }