-#define IRQ_UNLOCK(flags) do { flags=0; /* hostsim_lock(); */ } while(0)
-#define IRQ_LOCK(flags) do { flags=0; /* hostsim_unlock(); */ } while(0)
+#define cli() do { hostsim_cli(); } while(0)
+#define sei() do { hostsim_sei(); } while(0)
+#define IRQ_LOCK(flags) do { flags = hostsim_irq_save(); } while(0)
+#define IRQ_UNLOCK(flags) do { hostsim_irq_restore(flags); } while(0)