feat: support for USB mass storage devices, hotplugging

kernel/src/Drivers/USB/MassStorage.hpp

@@ -0,0 +1,22 @@
+/*
+    * MassStorage.hpp
+    * USB Mass Storage Bulk-Only Transport driver
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+
+namespace Drivers::USB::MassStorage {
+
+    // Register a USB Mass Storage interface after xHCI has configured its
+    // bulk IN and bulk OUT endpoints.
+    void RegisterDevice(uint8_t slotId);
+
+    // Tear down every mass-storage LUN associated with an xHCI slot.
+    void UnregisterDevice(uint8_t slotId);
+
+    // True while a bulk-only transport command is in flight.
+    bool IsTransportBusy();
+
+}