diff --git a/realm/aarch64/realm_entrypoint.S b/realm/aarch64/realm_entrypoint.S
index 73406f9..ab00989 100644
--- a/realm/aarch64/realm_entrypoint.S
+++ b/realm/aarch64/realm_entrypoint.S
@@ -16,6 +16,8 @@
 stacks_end:
 
 func realm_entrypoint
+	/* Save x0 - context_id */
+	mov	x20, x0
 	mrs	x0, mpidr_el1
 	mov_imm	x1, MPID_MASK
 	and	x0, x0, x1
@@ -26,6 +28,7 @@
 	/* mpidr 0 is assumed to be primary CPU, jump to warmboot otherwise */
 	cbnz	x0, realm_warmboot_endpoint
 
+	/* Primary CPU Only */
 	/* Clear BSS */
 	ldr	x0, =__REALM_BSS_START__
 	adr	x1, realm_entrypoint
@@ -53,7 +56,6 @@
 	add	x1, x1, x0
 	bl	fixup_gdt_reloc
 
-realm_warmboot_endpoint:
 	/* Initialize architectural state. */
 	bl	arch_init
 #if ENABLE_PAUTH
@@ -64,6 +66,15 @@
 	/* And jump to the C entrypoint. */
 	bl	realm_payload_main
 	b	loop
+
+realm_warmboot_endpoint:
+	/* Initialize architectural state. */
+	bl	arch_init
+#if ENABLE_PAUTH
+	bl	pauth_init_enable
+#endif
+	mov	x0, x20
+	b	realm_secondary_entrypoint
 endfunc realm_entrypoint
 
 /*
diff --git a/realm/include/realm_psci.h b/realm/include/realm_psci.h
new file mode 100644
index 0000000..ce41ffb
--- /dev/null
+++ b/realm/include/realm_psci.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include <stdint.h>
+
+void realm_cpu_off(void);
+u_register_t realm_cpu_on(u_register_t mpidr, uintptr_t entrypoint,
+		u_register_t context_id);
+u_register_t realm_psci_affinity_info(u_register_t target_affinity,
+		uint32_t lowest_affinity_level);
+u_register_t realm_psci_features(uint32_t psci_func_id);
diff --git a/realm/realm.mk b/realm/realm.mk
index 77499d0..23ebc0c 100644
--- a/realm/realm.mk
+++ b/realm/realm.mk
@@ -31,6 +31,7 @@
 	realm_pauth.c							\
 	realm_payload_main.c						\
 	realm_pmuv3.c							\
+	realm_psci.c							\
 	realm_rsi.c							\
 	realm_shared_data.c						\
 	realm_sve.c							\
diff --git a/realm/realm_psci.c b/realm/realm_psci.c
new file mode 100644
index 0000000..2a5b951
--- /dev/null
+++ b/realm/realm_psci.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include <debug.h>
+#include <psci.h>
+#include <realm_def.h>
+#include <tftf_lib.h>
+
+typedef void (*secondary_ep_t)(u_register_t);
+static secondary_ep_t entrypoint[MAX_REC_COUNT];
+static u_register_t context_id[MAX_REC_COUNT];
+void realm_entrypoint(void);
+void realm_payload_main(void);
+
+void realm_cpu_off(void)
+{
+	smc_args args = { SMC_PSCI_CPU_OFF };
+
+	tftf_smc(&args);
+}
+
+u_register_t realm_cpu_on(u_register_t mpidr, uintptr_t ep, u_register_t cxt_id)
+{
+	smc_args args;
+	smc_ret_values ret_vals;
+
+
+	if (mpidr > MAX_REC_COUNT) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	if (entrypoint[mpidr] != NULL) {
+		return PSCI_E_ALREADY_ON;
+	}
+
+	args.fid = SMC_PSCI_CPU_ON;
+	args.arg1 = mpidr;
+	args.arg2 = (u_register_t)realm_entrypoint;
+	args.arg3 = cxt_id;
+	entrypoint[mpidr] = (secondary_ep_t)ep;
+	context_id[mpidr] = cxt_id;
+	ret_vals = tftf_smc(&args);
+	return ret_vals.ret0;
+}
+
+u_register_t realm_psci_affinity_info(u_register_t target_affinity,
+		uint32_t lowest_affinity_level)
+{
+	smc_args args;
+	smc_ret_values ret_vals;
+
+	args.fid = SMC_PSCI_AFFINITY_INFO;
+	args.arg1 = target_affinity;
+	args.arg2 = lowest_affinity_level;
+	ret_vals = tftf_smc(&args);
+	return ret_vals.ret0;
+}
+
+u_register_t realm_psci_features(uint32_t psci_func_id)
+{
+
+	smc_args args;
+	smc_ret_values ret_vals;
+
+	args.fid = SMC_PSCI_FEATURES;
+	args.arg1 = psci_func_id;
+	ret_vals = tftf_smc(&args);
+	return ret_vals.ret0;
+}
+
+void realm_secondary_entrypoint(u_register_t cxt_id)
+{
+	u_register_t my_mpidr;
+	secondary_ep_t ep;
+
+	my_mpidr = read_mpidr_el1() & MPID_MASK;
+	ep = entrypoint[my_mpidr];
+	if (ep != NULL) {
+		entrypoint[my_mpidr] = NULL;
+		context_id[my_mpidr] = 0;
+		(ep)(context_id[my_mpidr]);
+	} else {
+		/*
+		 * Host can execute Rec directly without CPU_ON
+		 * from Realm, if Rec is created RUNNABLE
+		 * Jump to main in this case.
+		 */
+		while (true) {
+			realm_payload_main();
+		}
+	}
+	realm_cpu_off();
+}