diff --git a/include/lib/cpus/aarch64/cortex_deimos.h b/include/lib/cpus/aarch64/cortex_deimos.h
new file mode 100644
index 0000000..3c36567
--- /dev/null
+++ b/include/lib/cpus/aarch64/cortex_deimos.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __CORTEX_DEIMOS_H__
+#define __CORTEX_DEIMOS_H__
+
+#define CORTEX_DEIMOS_MIDR					U(0x410FD0D0)
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_DEIMOS_CPUECTLR_EL1				S3_0_C15_C1_4
+
+/*******************************************************************************
+ * CPU Power Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_DEIMOS_CPUPWRCTLR_EL1				S3_0_C15_C2_7
+#define CORTEX_DEIMOS_CPUPWRCTLR_EL1_CORE_PWRDN_BIT		(U(1) << 0)
+
+#endif /* __CORTEX_DEIMOS_H__ */
diff --git a/include/lib/cpus/aarch64/cortex_helios.h b/include/lib/cpus/aarch64/cortex_helios.h
new file mode 100644
index 0000000..1098a12
--- /dev/null
+++ b/include/lib/cpus/aarch64/cortex_helios.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __CORTEX_HELIOS_H__
+#define __CORTEX_HELIOS_H__
+
+#define CORTEX_HELIOS_MIDR		U(0x410FD060)
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_HELIOS_ECTLR_EL1		S3_0_C15_C1_4
+
+/*******************************************************************************
+ * CPU Auxiliary Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_HELIOS_CPUACTLR_EL1	S3_0_C15_C1_0
+
+/*******************************************************************************
+ * CPU Power Control register specific definitions.
+ ******************************************************************************/
+
+#define CORTEX_HELIOS_CPUPWRCTLR_EL1				S3_0_C15_C2_7
+#define CORTEX_HELIOS_CPUPWRCTLR_EL1_CORE_PWRDN_BIT		(U(1) << 0)
+
+#endif /* __CORTEX_HELIOS_H__ */
diff --git a/lib/cpus/aarch64/cortex_deimos.S b/lib/cpus/aarch64/cortex_deimos.S
new file mode 100644
index 0000000..aec62a2
--- /dev/null
+++ b/lib/cpus/aarch64/cortex_deimos.S
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <bl_common.h>
+#include <cortex_deimos.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+	/* ---------------------------------------------
+	 * HW will do the cache maintenance while powering down
+	 * ---------------------------------------------
+	 */
+func cortex_deimos_core_pwr_dwn
+	/* ---------------------------------------------
+	 * Enable CPU power down bit in power control register
+	 * ---------------------------------------------
+	 */
+	mrs	x0, CORTEX_DEIMOS_CPUPWRCTLR_EL1
+	orr	x0, x0, #CORTEX_DEIMOS_CPUPWRCTLR_EL1_CORE_PWRDN_BIT
+	msr	CORTEX_DEIMOS_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc cortex_deimos_core_pwr_dwn
+
+	/* ---------------------------------------------
+	 * This function provides Cortex-Deimos specific
+	 * register information for crash reporting.
+	 * It needs to return with x6 pointing to
+	 * a list of register names in ascii and
+	 * x8 - x15 having values of registers to be
+	 * reported.
+	 * ---------------------------------------------
+	 */
+.section .rodata.cortex_deimos_regs, "aS"
+cortex_deimos_regs:  /* The ascii list of register names to be reported */
+	.asciz	"cpuectlr_el1", ""
+
+func cortex_deimos_cpu_reg_dump
+	adr	x6, cortex_deimos_regs
+	mrs	x8, CORTEX_DEIMOS_CPUECTLR_EL1
+	ret
+endfunc cortex_deimos_cpu_reg_dump
+
+declare_cpu_ops cortex_deimos, CORTEX_DEIMOS_MIDR, \
+	CPU_NO_RESET_FUNC, \
+	cortex_deimos_core_pwr_dwn
diff --git a/lib/cpus/aarch64/cortex_helios.S b/lib/cpus/aarch64/cortex_helios.S
new file mode 100644
index 0000000..bcda741
--- /dev/null
+++ b/lib/cpus/aarch64/cortex_helios.S
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <arch.h>
+#include <asm_macros.S>
+#include <bl_common.h>
+#include <cortex_helios.h>
+#include <cpu_macros.S>
+#include <debug.h>
+#include <plat_macros.S>
+
+func cortex_helios_cpu_pwr_dwn
+	mrs	x0, CORTEX_HELIOS_CPUPWRCTLR_EL1
+	orr	x0, x0, #CORTEX_HELIOS_CPUPWRCTLR_EL1_CORE_PWRDN_BIT
+	msr	CORTEX_HELIOS_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc cortex_helios_cpu_pwr_dwn
+
+.section .rodata.cortex_helios_regs, "aS"
+cortex_helios_regs:  /* The ascii list of register names to be reported */
+	.asciz	"cpuectlr_el1", ""
+
+func cortex_helios_cpu_reg_dump
+	adr	x6, cortex_helios_regs
+	mrs	x8, CORTEX_HELIOS_ECTLR_EL1
+	ret
+endfunc cortex_helios_cpu_reg_dump
+
+declare_cpu_ops cortex_helios, CORTEX_HELIOS_MIDR, \
+	CPU_NO_RESET_FUNC, \
+	cortex_helios_cpu_pwr_dwn
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index ed41d4c..2b1e0ac 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -116,7 +116,8 @@
 				lib/cpus/aarch64/cortex_a73.S			\
 				lib/cpus/aarch64/cortex_a75.S			\
 				lib/cpus/aarch64/cortex_a76.S			\
-				lib/cpus/aarch64/cortex_ares.S
+				lib/cpus/aarch64/cortex_ares.S			\
+				lib/cpus/aarch64/cortex_deimos.S
 else
 FVP_CPU_LIBS		+=	lib/cpus/aarch32/cortex_a32.S
 endif