diff --git a/plat/hisilicon/hikey/include/platform_def.h b/plat/hisilicon/hikey/include/platform_def.h
new file mode 100644
index 0000000..a91a9b0
--- /dev/null
+++ b/plat/hisilicon/hikey/include/platform_def.h
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __PLATFORM_DEF_H__
+#define __PLATFORM_DEF_H__
+
+#include <arch.h>
+#include "../hikey_def.h"
+
+/*
+ * Platform binary types for linking
+ */
+#define PLATFORM_LINKER_FORMAT          "elf64-littleaarch64"
+#define PLATFORM_LINKER_ARCH            aarch64
+
+
+/*
+ * Generic platform constants
+ */
+
+/* Size of cacheable stacks */
+#define PLATFORM_STACK_SIZE		0x800
+
+#define FIRMWARE_WELCOME_STR		"Booting Trusted Firmware\n"
+
+#define PLATFORM_CACHE_LINE_SIZE	64
+#define PLATFORM_CLUSTER_COUNT		2
+#define PLATFORM_CORE_COUNT_PER_CLUSTER	4
+#define PLATFORM_CORE_COUNT		(PLATFORM_CLUSTER_COUNT *	\
+					 PLATFORM_CORE_COUNT_PER_CLUSTER)
+#define PLAT_MAX_PWR_LVL		MPIDR_AFFLVL2
+#define PLAT_NUM_PWR_DOMAINS		(PLATFORM_CORE_COUNT + \
+					 PLATFORM_CLUSTER_COUNT + 1)
+
+#define PLAT_MAX_RET_STATE		1
+#define PLAT_MAX_OFF_STATE		2
+
+#define MAX_IO_DEVICES			3
+#define MAX_IO_HANDLES			4
+/* eMMC RPMB and eMMC User Data */
+#define MAX_IO_BLOCK_DEVICES		2
+
+/* GIC related constants (no GICR in GIC-400) */
+#define PLAT_ARM_GICD_BASE		0xF6801000
+#define PLAT_ARM_GICC_BASE		0xF6802000
+#define PLAT_ARM_GICH_BASE		0xF6804000
+#define PLAT_ARM_GICV_BASE		0xF6806000
+
+
+/*
+ * Platform memory map related constants
+ */
+
+/*
+ * BL1 is stored in XG2RAM0_HIRQ that is 784KB large (0xF980_0000~0xF98C_4000).
+ */
+#define ONCHIPROM_PARAM_BASE		(XG2RAM0_BASE + 0x700)
+#define LOADER_RAM_BASE			(XG2RAM0_BASE + 0x800)
+#define BL1_XG2RAM0_OFFSET		0x1000
+
+/*
+ * BL1 specific defines.
+ *
+ * Both loader and BL1_RO region stay in SRAM since they are used to simulate
+ * ROM.
+ * Loader is used to switch Hi6220 SoC from 32-bit to 64-bit mode.
+ *
+ * ++++++++++  0xF980_0000
+ * + loader +
+ * ++++++++++  0xF980_1000
+ * + BL1_RO +
+ * ++++++++++  0xF981_0000
+ * + BL1_RW +
+ * ++++++++++  0xF989_8000
+ */
+#define BL1_RO_BASE			(XG2RAM0_BASE + BL1_XG2RAM0_OFFSET)
+#define BL1_RO_LIMIT			(XG2RAM0_BASE + 0x10000)
+#define BL1_RW_BASE			(BL1_RO_LIMIT)	/* 0xf981_0000 */
+#define BL1_RW_SIZE			(0x00088000)
+#define BL1_RW_LIMIT			(0xF9898000)
+
+/*
+ * BL2 specific defines.
+ */
+#define BL2_BASE			(BL1_RW_BASE + 0x8000)	/* 0xf981_8000 */
+#define BL2_LIMIT			(BL2_BASE + 0x40000)
+
+/*
+ * SCP_BL2 specific defines.
+ * In HiKey, SCP_BL2 means MCU firmware. It's loaded into the temporary buffer
+ * at 0x0100_0000. Then BL2 will parse the sections and loaded them into
+ * predefined separated buffers.
+ */
+#define SCP_BL2_BASE			(DDR_BASE + 0x01000000)
+#define SCP_BL2_LIMIT			(SCP_BL2_BASE + 0x00100000)
+#define SCP_BL2_SIZE			(SCP_BL2_LIMIT - SCP_BL2_BASE)
+
+/*
+ * BL31 specific defines.
+ */
+#define BL31_BASE			BL2_LIMIT
+#define BL31_LIMIT			0xF9898000
+
+#define NS_BL1U_BASE			(BL2_BASE)
+#define NS_BL1U_SIZE			(0x00010000)
+#define NS_BL1U_LIMIT			(NS_BL1U_BASE + NS_BL1U_SIZE)
+
+/*
+ * Platform specific page table and MMU setup constants
+ */
+#define ADDR_SPACE_SIZE			(1ull << 32)
+
+#if IMAGE_BL1 || IMAGE_BL2 || IMAGE_BL31
+#define MAX_XLAT_TABLES			3
+#endif
+
+#define MAX_MMAP_REGIONS		16
+
+#define HIKEY_NS_IMAGE_OFFSET		(DDR_BASE + 0x35000000)
+
+/*
+ * Declarations and constants to access the mailboxes safely. Each mailbox is
+ * aligned on the biggest cache line size in the platform. This is known only
+ * to the platform as it might have a combination of integrated and external
+ * caches. Such alignment ensures that two maiboxes do not sit on the same cache
+ * line at any cache level. They could belong to different cpus/clusters &
+ * get written while being protected by different locks causing corruption of
+ * a valid mailbox address.
+ */
+#define CACHE_WRITEBACK_SHIFT		6
+#define CACHE_WRITEBACK_GRANULE		(1 << CACHE_WRITEBACK_SHIFT)
+
+#endif /* __PLATFORM_DEF_H__ */