Kernel: Start work on abstracting Timers

kernel/kernel/Timer/Timer.cpp

@@ -0,0 +1,51 @@
+#include <kernel/Timer/Timer.h>
+#include <kernel/Timer/PIT.h>
+
+namespace Kernel
+{
+
+	static TimerHandler* s_instance = nullptr;
+
+	void TimerHandler::initialize()
+	{
+		ASSERT(s_instance == nullptr);
+		s_instance = new TimerHandler;
+		ASSERT(s_instance);
+		s_instance->initialize_timers();
+	}
+
+	TimerHandler& TimerHandler::get()
+	{
+		ASSERT(s_instance);
+		return *s_instance;
+	}
+
+	bool TimerHandler::is_initialized()
+	{
+		return !!s_instance;
+	}
+
+	void TimerHandler::initialize_timers()
+	{
+		if (auto res = PIT::create(); res.is_error())
+			dwarnln("PIT: {}", res.error());
+		else
+		{
+			MUST(m_timers.emplace_back(BAN::move(res.release_value())));
+			dprintln("PIT initialized");
+		}
+
+		ASSERT(!m_timers.empty());
+	}
+
+	uint64_t TimerHandler::ms_since_boot() const
+	{
+		return m_timers.front()->ms_since_boot();
+	}
+
+	void TimerHandler::sleep(uint64_t ms) const
+	{
+		return m_timers.front()->sleep(ms);
+	}
+
+}