diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index 2d40630..42bbf38 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -171,7 +171,6 @@
 int arm_validate_ns_entrypoint(uintptr_t entrypoint);
 void arm_system_pwr_domain_save(void);
 void arm_system_pwr_domain_resume(void);
-void arm_program_trusted_mailbox(uintptr_t address);
 int arm_psci_read_mem_protect(int *enabled);
 int arm_nor_psci_write_mem_protect(int val);
 void arm_nor_psci_do_static_mem_protect(void);
@@ -250,6 +249,7 @@
 void plat_arm_interconnect_init(void);
 void plat_arm_interconnect_enter_coherency(void);
 void plat_arm_interconnect_exit_coherency(void);
+void plat_arm_program_trusted_mailbox(uintptr_t address);
 
 #if ARM_PLAT_MT
 unsigned int plat_arm_get_cpu_pe_count(u_register_t mpidr);
diff --git a/plat/arm/common/arm_bl1_setup.c b/plat/arm/common/arm_bl1_setup.c
index 1c900b7..c9b1a68 100644
--- a/plat/arm/common/arm_bl1_setup.c
+++ b/plat/arm/common/arm_bl1_setup.c
@@ -144,7 +144,7 @@
 	 * in order to release secondary CPUs from their holding pen and make
 	 * them jump there.
 	 */
-	arm_program_trusted_mailbox(ep_info->pc);
+	plat_arm_program_trusted_mailbox(ep_info->pc);
 	dsbsy();
 	sev();
 #endif
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 5330847..67b574d 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -166,7 +166,7 @@
 				plat/arm/common/arm_err.c			\
 				plat/arm/common/arm_io_storage.c
 ifdef EL3_PAYLOAD_BASE
-# Need the arm_program_trusted_mailbox() function to release secondary CPUs from
+# Need the plat_arm_program_trusted_mailbox() function to release secondary CPUs from
 # their holding pen
 BL1_SOURCES		+=	plat/arm/common/arm_pm.c
 endif
diff --git a/plat/arm/common/arm_pm.c b/plat/arm/common/arm_pm.c
index 4fdb10a..d0350d6 100644
--- a/plat/arm/common/arm_pm.c
+++ b/plat/arm/common/arm_pm.c
@@ -14,8 +14,9 @@
 #include <platform_def.h>
 #include <psci.h>
 
-/* Allow ARM Standard platforms to override this function */
+/* Allow ARM Standard platforms to override these functions */
 #pragma weak plat_arm_psci_override_pm_ops
+#pragma weak plat_arm_program_trusted_mailbox
 
 #if ARM_RECOM_STATE_ID_ENC
 extern unsigned int arm_pm_idle_states[];
@@ -189,11 +190,11 @@
 }
 
 /*******************************************************************************
- * Private function to program the mailbox for a cpu before it is released
+ * ARM platform function to program the mailbox for a cpu before it is released
  * from reset. This function assumes that the Trusted mail box base is within
  * the ARM_SHARED_RAM region
  ******************************************************************************/
-void arm_program_trusted_mailbox(uintptr_t address)
+void plat_arm_program_trusted_mailbox(uintptr_t address)
 {
 	uintptr_t *mailbox = (void *) PLAT_ARM_TRUSTED_MAILBOX_BASE;
 
@@ -218,6 +219,6 @@
 	*psci_ops = plat_arm_psci_override_pm_ops(&plat_arm_psci_pm_ops);
 
 	/* Setup mailbox with entry point. */
-	arm_program_trusted_mailbox(sec_entrypoint);
+	plat_arm_program_trusted_mailbox(sec_entrypoint);
 	return 0;
 }
diff --git a/plat/arm/css/common/css_common.mk b/plat/arm/css/common/css_common.mk
index 72d5527..29dd01d 100644
--- a/plat/arm/css/common/css_common.mk
+++ b/plat/arm/css/common/css_common.mk
@@ -32,6 +32,7 @@
 				plat/arm/css/drivers/scpi/css_scpi.c
 else
 BL31_SOURCES		+=	plat/arm/css/drivers/scp/css_pm_scmi.c		\
+				plat/arm/css/drivers/scmi/scmi_ap_core_proto.c	\
 				plat/arm/css/drivers/scmi/scmi_common.c		\
 				plat/arm/css/drivers/scmi/scmi_pwr_dmn_proto.c	\
 				plat/arm/css/drivers/scmi/scmi_sys_pwr_proto.c	\
diff --git a/plat/arm/css/drivers/scmi/scmi.h b/plat/arm/css/drivers/scmi/scmi.h
index cf9ef5e..723fd06 100644
--- a/plat/arm/css/drivers/scmi/scmi.h
+++ b/plat/arm/css/drivers/scmi/scmi.h
@@ -12,6 +12,7 @@
 #include <stdint.h>
 
 /* Supported SCMI Protocol Versions */
+#define SCMI_AP_CORE_PROTO_VER			MAKE_SCMI_VERSION(1, 0)
 #define SCMI_PWR_DMN_PROTO_VER			MAKE_SCMI_VERSION(1, 0)
 #define SCMI_SYS_PWR_PROTO_VER			MAKE_SCMI_VERSION(1, 0)
 
@@ -29,6 +30,8 @@
 /* SCMI Protocol identifiers */
 #define SCMI_PWR_DMN_PROTO_ID			0x11
 #define SCMI_SYS_PWR_PROTO_ID			0x12
+/* The AP core protocol is a CSS platform-specific extension */
+#define SCMI_AP_CORE_PROTO_ID			0x90
 
 /* Mandatory messages IDs for all SCMI protocols */
 #define SCMI_PROTO_VERSION_MSG			0x0
@@ -43,6 +46,10 @@
 #define SCMI_SYS_PWR_STATE_SET_MSG		0x3
 #define SCMI_SYS_PWR_STATE_GET_MSG		0x4
 
+/* SCMI AP core protocol message IDs */
+#define SCMI_AP_CORE_RESET_ADDR_SET_MSG		0x3
+#define SCMI_AP_CORE_RESET_ADDR_GET_MSG		0x4
+
 /* Helper macros for system power management protocol commands */
 
 /*
@@ -73,6 +80,13 @@
 #define SCMI_SYS_PWR_POWER_UP			0x3
 #define SCMI_SYS_PWR_SUSPEND			0x4
 
+/*
+ * Macros to describe the bit-fields of the `attribute` of AP core protocol
+ * AP_CORE_RESET_ADDR set/get messages.
+ */
+#define SCMI_AP_CORE_LOCK_ATTR_SHIFT		0x0
+#define SCMI_AP_CORE_LOCK_ATTR			(1U << SCMI_AP_CORE_LOCK_ATTR_SHIFT)
+
 /* SCMI Error code definitions */
 #define SCMI_E_QUEUED			1
 #define SCMI_E_SUCCESS			0
@@ -133,4 +147,8 @@
 int scmi_sys_pwr_state_set(void *p, uint32_t flags, uint32_t system_state);
 int scmi_sys_pwr_state_get(void *p, uint32_t *system_state);
 
+/* SCMI AP core configuration protocol commands. */
+int scmi_ap_core_set_reset_addr(void *p, uint64_t reset_addr, uint32_t attr);
+int scmi_ap_core_get_reset_addr(void *p, uint64_t *reset_addr, uint32_t *attr);
+
 #endif	/* __CSS_SCMI_H__ */
diff --git a/plat/arm/css/drivers/scmi/scmi_ap_core_proto.c b/plat/arm/css/drivers/scmi/scmi_ap_core_proto.c
new file mode 100644
index 0000000..1438cba
--- /dev/null
+++ b/plat/arm/css/drivers/scmi/scmi_ap_core_proto.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <debug.h>
+#include "scmi.h"
+#include "scmi_private.h"
+
+/*
+ * API to set the SCMI AP core reset address and attributes
+ */
+int scmi_ap_core_set_reset_addr(void *p, uint64_t reset_addr, uint32_t attr)
+{
+	mailbox_mem_t *mbx_mem;
+	int token = 0, ret;
+	scmi_channel_t *ch = (scmi_channel_t *)p;
+
+	validate_scmi_channel(ch);
+
+	scmi_get_channel(ch);
+
+	mbx_mem = (mailbox_mem_t *)(ch->info->scmi_mbx_mem);
+	mbx_mem->msg_header = SCMI_MSG_CREATE(SCMI_AP_CORE_PROTO_ID,
+			SCMI_AP_CORE_RESET_ADDR_SET_MSG, token);
+	mbx_mem->len = SCMI_AP_CORE_RESET_ADDR_SET_MSG_LEN;
+	mbx_mem->flags = SCMI_FLAG_RESP_POLL;
+	SCMI_PAYLOAD_ARG3(mbx_mem->payload, reset_addr & 0xffffffff,
+		reset_addr >> 32, attr);
+
+	scmi_send_sync_command(ch);
+
+	/* Get the return values */
+	SCMI_PAYLOAD_RET_VAL1(mbx_mem->payload, ret);
+	assert(mbx_mem->len == SCMI_AP_CORE_RESET_ADDR_SET_RESP_LEN);
+	assert(token == SCMI_MSG_GET_TOKEN(mbx_mem->msg_header));
+
+	scmi_put_channel(ch);
+
+	return ret;
+}
+
+/*
+ * API to get the SCMI AP core reset address and attributes
+ */
+int scmi_ap_core_get_reset_addr(void *p, uint64_t *reset_addr, uint32_t *attr)
+{
+	mailbox_mem_t *mbx_mem;
+	int token = 0, ret;
+	scmi_channel_t *ch = (scmi_channel_t *)p;
+	uint32_t lo_addr, hi_addr;
+
+	validate_scmi_channel(ch);
+
+	scmi_get_channel(ch);
+
+	mbx_mem = (mailbox_mem_t *)(ch->info->scmi_mbx_mem);
+	mbx_mem->msg_header = SCMI_MSG_CREATE(SCMI_AP_CORE_PROTO_ID,
+			SCMI_AP_CORE_RESET_ADDR_GET_MSG, token);
+	mbx_mem->len = SCMI_AP_CORE_RESET_ADDR_GET_MSG_LEN;
+	mbx_mem->flags = SCMI_FLAG_RESP_POLL;
+
+	scmi_send_sync_command(ch);
+
+	/* Get the return values */
+	SCMI_PAYLOAD_RET_VAL4(mbx_mem->payload, ret, lo_addr, hi_addr, *attr);
+	*reset_addr = lo_addr | (uint64_t)hi_addr << 32;
+	assert(mbx_mem->len == SCMI_AP_CORE_RESET_ADDR_GET_RESP_LEN);
+	assert(token == SCMI_MSG_GET_TOKEN(mbx_mem->msg_header));
+
+	scmi_put_channel(ch);
+
+	return ret;
+}
diff --git a/plat/arm/css/drivers/scmi/scmi_private.h b/plat/arm/css/drivers/scmi/scmi_private.h
index 67fe748..39bc8cc 100644
--- a/plat/arm/css/drivers/scmi/scmi_private.h
+++ b/plat/arm/css/drivers/scmi/scmi_private.h
@@ -18,6 +18,12 @@
 #define SCMI_PROTO_MSG_ATTR_MSG_LEN		8
 #define SCMI_PROTO_MSG_ATTR_RESP_LEN		12
 
+#define SCMI_AP_CORE_RESET_ADDR_SET_MSG_LEN	16
+#define SCMI_AP_CORE_RESET_ADDR_SET_RESP_LEN	8
+
+#define SCMI_AP_CORE_RESET_ADDR_GET_MSG_LEN	4
+#define SCMI_AP_CORE_RESET_ADDR_GET_RESP_LEN	20
+
 #define SCMI_PWR_STATE_SET_MSG_LEN		16
 #define SCMI_PWR_STATE_SET_RESP_LEN		8
 
@@ -113,6 +119,11 @@
 		(val3) = mmio_read_32((uintptr_t)&payld_arr[2]);	\
 	} while (0)
 
+#define SCMI_PAYLOAD_RET_VAL4(payld_arr, val1, val2, val3, val4)	do {	\
+		SCMI_PAYLOAD_RET_VAL3(payld_arr, val1, val2, val3);		\
+		(val4) = mmio_read_32((uintptr_t)&payld_arr[3]);		\
+	} while (0)
+
 /*
  * Private data structure for representing the mailbox memory layout. Refer
  * the SCMI specification for more details.
diff --git a/plat/arm/css/drivers/scp/css_pm_scmi.c b/plat/arm/css/drivers/scp/css_pm_scmi.c
index 715bf98..7032267 100644
--- a/plat/arm/css/drivers/scp/css_pm_scmi.c
+++ b/plat/arm/css/drivers/scp/css_pm_scmi.c
@@ -306,6 +306,28 @@
 		.ring_doorbell = &mhu_ring_doorbell,
 };
 
+static int scmi_ap_core_init(scmi_channel_t *ch)
+{
+#if PROGRAMMABLE_RESET_ADDRESS
+	uint32_t version;
+	int ret;
+
+	ret = scmi_proto_version(ch, SCMI_AP_CORE_PROTO_ID, &version);
+	if (ret != SCMI_E_SUCCESS) {
+		WARN("SCMI AP core protocol version message failed\n");
+		return -1;
+	}
+
+	if (!is_scmi_version_compatible(SCMI_AP_CORE_PROTO_VER, version)) {
+		WARN("SCMI AP core protocol version 0x%x incompatible with driver version 0x%x\n",
+			version, SCMI_AP_CORE_PROTO_VER);
+		return -1;
+	}
+	INFO("SCMI AP core protocol version 0x%x detected\n", version);
+#endif
+	return 0;
+}
+
 void plat_arm_pwrc_setup(void)
 {
 	channel.info = &plat_css_scmi_plat_info;
@@ -315,6 +337,10 @@
 		ERROR("SCMI Initialization failed\n");
 		panic();
 	}
+	if (scmi_ap_core_init(&channel) < 0) {
+		ERROR("SCMI AP core protocol initialization failed\n");
+		panic();
+	}
 }
 
 /******************************************************************************
@@ -386,3 +412,18 @@
 	 */
 	return 0;
 }
+
+#if PROGRAMMABLE_RESET_ADDRESS
+void plat_arm_program_trusted_mailbox(uintptr_t address)
+{
+	int ret;
+
+	assert(scmi_handle);
+	ret = scmi_ap_core_set_reset_addr(scmi_handle, address,
+		SCMI_AP_CORE_LOCK_ATTR);
+	if (ret != SCMI_E_SUCCESS) {
+		ERROR("CSS: Failed to program reset address: %d\n", ret);
+		panic();
+	}
+}
+#endif