Rename the src directory to kernel.

kernel/arch/x86_64/irq.rs

@@ -0,0 +1,10 @@
+//! # IRQ handling
+//!
+//! This module defines IRQ handling functions. These functions should all be #[naked],
+//! unsafe, extern, and end in `iretq`
+
+/// Interupt Request handler.
+#[naked]
+pub unsafe extern fn irq() {
+
+}