--- /dev/null
+#ifndef BUILTIN_H
+#define BUILTIN_H
+
+extern int cmd_set(int argc, const char **argv);
+extern int cmd_info(int argc, const char **argv);
+extern int cmd_freq_set(int argc, const char **argv);
+extern int cmd_freq_info(int argc, const char **argv);
+extern int cmd_idle_set(int argc, const char **argv);
+extern int cmd_idle_info(int argc, const char **argv);
+extern int cmd_monitor(int argc, const char **argv);
+
+#endif