+#define RTE_PRIORITY_LOG 101
+#define RTE_PRIORITY_BUS 110
+#define RTE_PRIORITY_CLASS 120
+#define RTE_PRIORITY_LAST 65535
+
+#define RTE_PRIO(prio) \
+ RTE_PRIORITY_ ## prio
+
+/**
+ * Run function before main() with high priority.
+ *
+ * @param func
+ * Constructor function.
+ * @param prio
+ * Priority number must be above 100.
+ * Lowest number is the first to run.
+ */
+#define RTE_INIT_PRIO(func, prio) \
+static void __attribute__((constructor(RTE_PRIO(prio)), used)) func(void)
+