diff --git a/yeeshell.c b/yeeshell.c
index 1e06d86..2352238 100644
--- a/yeeshell.c
+++ b/yeeshell.c
@@ -677,4 +677,25 @@ void print_procs(struct proc *proc1, struct proc *proc2, int cputimemode)
 	printf("%6.2f%% in total\n", 100.0 * (systemticks + userticks) / total_ticks);
 	//printf("%6.2f%% kernel, ", 100.0 * kernelticks/ total_ticks);
 	//printf("%6.2f%% idle", 100.0 * idleticks / total_ticks);
-}
\ No newline at end of file
+}
+
+u64_t cputicks(struct proc *p1, struct proc *p2, int timemode)
+{
+	int i;
+	u64_t t = 0;
+	for (i = 0; i < CPUTIMENAMES; i++)
+	{
+		if (!CPUTIME(timemode, i))
+			continue;
+		if (p1->p_endpoint == p2->p_endpoint)
+		{
+			t = t + p2->p_cpucycles[i] - p1->p_cpucycles[i];
+		}
+		else
+		{
+			t = t + p2->p_cpucycles[i];
+		}
+	}
+
+	return t;
+}
diff --git a/yeeshell.h b/yeeshell.h
index ba54bdd..c98bf15 100644
--- a/yeeshell.h
+++ b/yeeshell.h
@@ -100,4 +100,5 @@ void get_procs();
 void parse_dir();
 void parse_file(pid_t pid);
 void getkinfo();
-void print_procs(struct proc *proc1, struct proc *proc2, int cputimemode);
\ No newline at end of file
+void print_procs(struct proc *proc1, struct proc *proc2, int cputimemode);
+u64_t cputicks(struct proc *p1, struct proc *p2, int timemode);
\ No newline at end of file