Implement code for integration test post

src/lib.rs

@@ -0,0 +1,24 @@
+#![feature(const_fn)]
+#![no_std] // don't link the Rust standard library
+
+extern crate spin;
+extern crate volatile;
+#[macro_use]
+extern crate lazy_static;
+extern crate uart_16550;
+extern crate x86_64;
+
+#[cfg(test)]
+extern crate array_init;
+#[cfg(test)]
+extern crate std;
+
+pub mod vga_buffer;
+pub mod serial;
+
+pub unsafe fn exit_qemu() {
+    use x86_64::instructions::port::Port;
+
+    let mut port = Port::<u32>::new(0xf4);
+    port.write(0);
+}