Kernel/riscv64: Make the kernel compile

This commits inserts TODOs into all necessary places to make the kernel
compile on riscv64!

Kernel/Arch/riscv64/InterruptManagement.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2023, Sönke Holz <sholz8530@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Vector.h>
+#include <Kernel/Arch/riscv64/IRQController.h>
+
+#include <AK/Platform.h>
+VALIDATE_IS_RISCV64()
+
+namespace Kernel {
+
+class InterruptManagement {
+public:
+    static InterruptManagement& the();
+    static void initialize();
+    static bool initialized();
+
+    static u8 acquire_mapped_interrupt_number(u8 original_irq);
+
+    Vector<NonnullLockRefPtr<IRQController>> const& controllers();
+    NonnullLockRefPtr<IRQController> get_responsible_irq_controller(size_t irq_number);
+
+    void enumerate_interrupt_handlers(Function<void(GenericInterruptHandler&)>);
+
+private:
+    InterruptManagement() = default;
+    void find_controllers();
+
+    Vector<NonnullLockRefPtr<IRQController>> m_interrupt_controllers;
+};
+
+}