Add halt loop

src/main.rs

@@ -10,9 +10,9 @@ mod gdt;
 use core::panic::PanicInfo;
 
 #[panic_handler]
-fn panic(info: &PanicInfo) -> !{
+fn panic(info: &PanicInfo) -> ! {
   println!("{}", info);
-  loop {}
+  halt_loop();
 }
 
 pub fn init() {
@@ -30,10 +30,12 @@ pub extern "C" fn _start() -> ! {
   for i in 1..10 {
     println!("Gamarjoba, munde: {}", i);
   }
+  halt_loop();
+}
+
+pub fn halt_loop() -> ! {
   loop {
-    for _ in 0..100_000 {
-    }
-    print!("-");
+    x86_64::instructions::hlt();
   }
 }