Kernel: Start work on abstracting Timers

kernel/include/kernel/Timer/PIT.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <kernel/Timer/Timer.h>
+#include <stdint.h>
+
+#define PIT_IRQ 0
+
+namespace Kernel
+{
+
+	class PIT final : public Timer
+	{
+	public:
+		static BAN::ErrorOr<BAN::UniqPtr<PIT>> create();
+
+		virtual uint64_t ms_since_boot() const override;
+		virtual void sleep(uint64_t) const override;
+
+	private:
+		void initialize();
+	};
+
+}

kernel/include/kernel/Timer/Timer.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <BAN/UniqPtr.h>
+#include <BAN/Vector.h>
+
+namespace Kernel
+{
+
+	class Timer
+	{
+	public:
+		virtual ~Timer() {};
+		virtual uint64_t ms_since_boot() const = 0;
+		virtual void sleep(uint64_t) const = 0;
+	};
+
+	class TimerHandler
+	{
+	public:
+		static void initialize();
+		static TimerHandler& get();
+		static bool is_initialized();
+
+		uint64_t ms_since_boot() const;
+		void sleep(uint64_t) const;
+
+	private:
+		TimerHandler() = default;
+
+		void initialize_timers();
+
+	private:
+		BAN::Vector<BAN::UniqPtr<Timer>> m_timers;
+	};
+
+}