diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index 9e82e29..5177b06 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -454,5 +454,11 @@
  */
 #define PLAT_PERCPU_BAKERY_LOCK_SIZE		(1 * CACHE_WRITEBACK_GRANULE)
 
+/* Priority levels for ARM platforms */
+#define PLAT_SDEI_CRITICAL_PRI		0x60
+#define PLAT_SDEI_NORMAL_PRI		0x70
+
+/* ARM platforms use 3 upper bits of secure interrupt priority */
+#define ARM_PRI_BITS			3
 
 #endif /* __ARM_DEF_H__ */