diff --git a/include/lib/smccc.h b/include/lib/smccc.h
index 8fd6093..c493105 100644
--- a/include/lib/smccc.h
+++ b/include/lib/smccc.h
@@ -111,6 +111,8 @@
 #define SMC_OK				ULL(0)
 #define SMC_UNK				-1
 #define SMC_PREEMPTED			-2	/* Not defined by the SMCCC */
+#define SMC_DENIED			-3	/* Not defined by the SMCCC */
+#define SMC_INVALID_PARAM		-4	/* Not defined by the SMCCC */
 
 /* Return codes for Arm Architecture Service SMC calls */
 #define SMC_ARCH_CALL_SUCCESS		0
diff --git a/include/plat/arm/common/arm_sip_svc.h b/include/plat/arm/common/arm_sip_svc.h
index 266092e..a6fd42b 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) 2016-2019,2021-2023, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2019,2021-2024, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -42,6 +42,16 @@
 #define ARM_SIP_SET_INTERRUPT_PENDING	U(0x82000100)
 #endif
 
+/**
+ * Arm SiP Service Call for the SPM to leverage RME to protect a give memory range.
+ * Protected memory range is one whose PAS was made secure.
+ * Unprotect relates to reverting a protect operation.
+ */
+#if SPMD_SPM_AT_SEL2 && ENABLE_RME
+#define PLAT_PROTECT_MEM_SMC64 0xC2000101
+#define PLAT_UNPROTECT_MEM_SMC64 0xC2000102
+#endif
+
 /* SiP handler specific to each Arm platform. */
 uintptr_t plat_arm_sip_handler(uint32_t smc_fid,
 				u_register_t x1,