diff --git a/include/plat/arm/common/arm_sip_svc.h b/include/plat/arm/common/arm_sip_svc.h
index 640bbaf..f3eac31 100644
--- a/include/plat/arm/common/arm_sip_svc.h
+++ b/include/plat/arm/common/arm_sip_svc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -38,8 +38,11 @@
 /*					0x8200ff02 is reserved */
 #define ARM_SIP_SVC_VERSION		0x8200ff03
 
+/* Function ID for requesting state switch of lower EL */
+#define ARM_SIP_SVC_EXE_STATE_SWITCH	0x82000020
+
 /* ARM SiP Service Calls version numbers */
 #define ARM_SIP_SVC_VERSION_MAJOR		0x0
-#define ARM_SIP_SVC_VERSION_MINOR		0x1
+#define ARM_SIP_SVC_VERSION_MINOR		0x2
 
 #endif /* __ARM_SIP_SVC_H__ */
diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index 8ea32b9..2b7e16c 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -124,6 +124,9 @@
 
 #endif /* __ARM_RECOM_STATE_ID_ENC__ */
 
+/* ARM State switch error codes */
+#define STATE_SW_E_PARAM		(-2)
+#define STATE_SW_E_DENIED		(-3)
 
 /* IO storage utility functions */
 void arm_io_setup(void);
@@ -230,4 +233,12 @@
 /* Allow platform to override psci_pm_ops during runtime */
 const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops);
 
+/* Execution state switch in ARM platforms */
+int arm_execution_state_switch(unsigned int smc_fid,
+		uint32_t pc_hi,
+		uint32_t pc_lo,
+		uint32_t cookie_hi,
+		uint32_t cookie_lo,
+		void *handle);
+
 #endif /* __PLAT_ARM_H__ */