add some hints

kern/trap.c

@@ -59,14 +59,26 @@ static const char *trapname(int trapno)
 }
 
 
+// XYZ: write a function declaration here...
+// e.g., void t_divide();
+
 void
 trap_init(void)
 {
 	extern struct Segdesc gdt[];
 
+    /*
+     *
+     * HINT
+     * Do something like this: SETGATE(idt[T_DIVIDE], 0, GD_KT, t_divide, 0);
+     * if your trap handler's name for divide by zero is t_device.
+     * Additionally, you should declare trap handler as a function
+     * to refer that in C code... (see the comment XYZ above)
+     *
+     */
 	// LAB 3: Your code here.
 
-	// Per-CPU setup 
+	// Per-CPU setup
 	trap_init_percpu();
 }
 

kern/trapentry.S

@@ -47,9 +47,15 @@
  * Lab 3: Your code here for generating entry points for the different traps.
  */
 
-
+// HINT 1 : TRAPHANDLER_NOEC(t_divide, T_DIVIDE);
+//          Do something like this if there is no error code for the trap
+// HINT 2 : TRAPHANDLER(t_dblflt, T_DBLFLT);
+//          Do something like this if the trap includes an error code..
+// HINT 3 : READ Intel's manual to check if the trap includes an error code
+//          or not...
 
 /*
  * Lab 3: Your code here for _alltraps
  */
 
+