link in the prelude object

boot1/src/main.rs

@@ -10,6 +10,10 @@ const VGA_ADDR: usize = 0xb8000;
 
 const STR: &[u8] = b"the quick brown fox jumps over the lazy dog";
 
+extern "C" {
+  fn prelude() -> !;
+}
+
 #[panic_handler]
 fn panic(_info: &PanicInfo) -> ! {
   hlt()
@@ -43,7 +47,8 @@ pub extern "C" fn _start() -> ! {
 
   vga_buf[0] = 0x1f02; //smiley
 
-  hlt()
+  // hlt()
+  unsafe { prelude() };
 }
 
 #[inline]