Kernel: Implement NVMe driver

I'm  actually able to boot this os fine on own laptop now!

kernel/include/kernel/Storage/NVMe/Controller.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <BAN/Vector.h>
+#include <kernel/InterruptController.h>
+#include <kernel/PCI.h>
+#include <kernel/Storage/NVMe/Definitions.h>
+#include <kernel/Storage/NVMe/Namespace.h>
+#include <kernel/Storage/NVMe/Queue.h>
+
+namespace Kernel
+{
+
+	class NVMeController final : public StorageController, public CharacterDevice
+	{
+		BAN_NON_COPYABLE(NVMeController);
+		BAN_NON_MOVABLE(NVMeController);
+
+	public:
+		static BAN::ErrorOr<BAN::RefPtr<StorageController>> create(PCI::Device&);
+		~NVMeController() { ASSERT_NOT_REACHED(); }
+
+		NVMeQueue& io_queue() { return *m_io_queue; }
+
+		virtual dev_t rdev() const override { return m_rdev; }
+		virtual BAN::StringView name() const override { return m_name; }
+
+	private:
+		NVMeController(PCI::Device& pci_device);
+		virtual BAN::ErrorOr<void> initialize() override;
+
+		BAN::ErrorOr<void> identify_controller();
+		BAN::ErrorOr<void> identify_namespaces();
+
+		BAN::ErrorOr<void> wait_until_ready(bool expected_value);
+		BAN::ErrorOr<void> create_admin_queue();
+		BAN::ErrorOr<void> create_io_queue();
+
+	private:
+		PCI::Device& m_pci_device;
+		BAN::UniqPtr<PCI::BarRegion> m_bar0;
+		volatile NVMe::ControllerRegisters* m_controller_registers;
+
+		BAN::UniqPtr<NVMeQueue> m_admin_queue;
+		BAN::UniqPtr<NVMeQueue> m_io_queue;
+
+		BAN::Vector<BAN::RefPtr<NVMeNamespace>> m_namespaces;
+
+		char m_name[20];
+		const dev_t m_rdev;
+	};
+
+}