Kernel: Implement PS/2 mouse driver

This is realtively simple driver that queries extensions (scroll +
extra buttons) from mouse and reads mouse packages.

kernel/include/kernel/Input/MouseEvent.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace Kernel::Input
+{
+
+	enum class MouseButton
+	{
+		Left, Right, Middle, Extra1, Extra2
+	};
+
+	struct MouseButtonEvent
+	{
+		MouseButton button;
+		bool pressed;
+	};
+
+	struct MouseMoveEvent
+	{
+		int32_t rel_x;
+		int32_t rel_y;
+	};
+
+	struct MouseScrollEvent
+	{
+		int32_t scroll;
+	};
+
+	enum class MouseEventType
+	{
+		MouseButtonEvent,
+		MouseMoveEvent,
+		MouseScrollEvent,
+	};
+
+	struct MouseEvent
+	{
+		MouseEventType type;
+		union
+		{
+			MouseButtonEvent button_event;
+			MouseMoveEvent move_event;
+			MouseScrollEvent scroll_event;
+		};	
+	};
+
+}

kernel/include/kernel/Input/PS2/Mouse.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <kernel/Input/MouseEvent.h>
+#include <kernel/Input/PS2/Device.h>
+#include <kernel/Semaphore.h>
+
+namespace Kernel::Input
+{
+
+	class PS2Mouse final : public PS2Device
+	{
+	private:
+		enum Command : uint8_t
+		{
+			SET_SAMPLE_RATE = 0xF3
+		};
+
+	public:
+		static BAN::ErrorOr<PS2Mouse*> create(PS2Controller&);
+		virtual void send_initialize() override;
+
+		virtual void handle_byte(uint8_t) final override;
+		virtual void handle_device_command_response(uint8_t) final override;
+
+	private:
+		PS2Mouse(PS2Controller& controller);
+
+		void initialize_extensions(uint8_t);
+
+	private:
+		uint8_t m_byte_buffer[10];
+		uint8_t m_byte_index { 0 };
+
+		bool	m_enabled		{ false };
+		uint8_t m_mouse_id		{ 0x00 };
+		uint8_t m_button_mask	{ 0x00 };
+
+		BAN::CircularQueue<MouseEvent, 25> m_event_queue;
+
+		Semaphore m_semaphore;
+
+	protected:
+		virtual BAN::ErrorOr<size_t> read_impl(off_t, BAN::ByteSpan) override;
+		virtual bool has_data_impl() const override;
+	};
+
+}