Update pit.c

student-distrib/pit.c

@@ -20,7 +20,19 @@ void pit_handler(){
 
 	send_eoi(0);
 
-    //todo
+	pcb_t* pcb = get_pcb(control.cur_pid);
+	
+	asm volatile(
+		"movl %%esp, %0\n"
+		"movl %%ebp, %1\n"
+		"leal switch_addr, %2\n"
+		: "=r" (pcb->current_esp), "=r" (pcb->current_ebp), "=r" (pcb->current_eip)
+		: 
+		: "memory"
+	);
+	scheduler();
+	asm volatile ("switch_addr:");
+	return;
 
     return;
 }