Completed Part2: 07_timers.

Part2/A4/07_timers/kernel/kernel.c

@@ -6,7 +6,9 @@ void _start() {
     isr_install();
 
     asm volatile("sti");
-    init_timer(50);
+    /* init_timer(50); */
+    /* init_timer(1000); */
+    init_timer(10);
     /* Comment out the timer IRQ handler to read
      * the keyboard IRQs easier */
     init_keyboard();