Add and test a handler_with_error_code macro and a page fault handler

src/lib.rs

@@ -52,8 +52,9 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) {
     // initialize our IDT
     interrupts::init();
 
-    // provoke a invalid opcode exception
-    unsafe { asm!("ud2") };
+    // provoke a page fault
+    unsafe { *(0xdeadbeaf as *mut u64) = 42 };
+
 
     println!("It did not crash!");
     loop {}