Kernel: Make serial devices to their own class

kernel/include/kernel/Serial.h

@@ -1,11 +1,28 @@
 #pragma once
 
-namespace Serial
+#include <BAN/Errors.h>
+
+namespace Kernel
 {
 
-	void initialize();
-	bool is_initialized();
+	class Serial
+	{
+	public:
+		static void initialize();
+		static bool has_devices();
+		static void putchar_any(char);
 
-	void putchar(char);
+		void putchar(char);
+
+	private:
+		static bool port_has_device(uint16_t);
+
+		bool is_transmit_empty() const;
+
+		bool is_valid() const { return m_port != 0; }
+
+	private:
+		uint16_t m_port { 0 };
+	};
 
 }