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.