diff --git a/plat/arm/css/drivers/sds/sds_private.h b/plat/arm/css/drivers/sds/sds_private.h
new file mode 100644
index 0000000..649576b
--- /dev/null
+++ b/plat/arm/css/drivers/sds/sds_private.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __SDS_PRIVATE_H__
+#define __SDS_PRIVATE_H__
+
+/* SDS Header defines */
+#define SDS_HEADER_ID_SHIFT			0
+#define SDS_HEADER_ID_WIDTH			16
+#define SDS_HEADER_ID_MASK			((1 << SDS_HEADER_ID_WIDTH) - 1)
+
+#define SDS_HEADER_MINOR_VERSION_WIDTH		8
+#define SDS_HEADER_MINOR_VERSION_SHIFT		16
+#define SDS_HEADER_MAJOR_VERSION_WIDTH		8
+
+#define MAKE_SDS_HEADER_VERSION(major, minor)	\
+	(((((major) & 0xff) << SDS_HEADER_MINOR_VERSION_WIDTH) | ((minor) & 0xff)))
+#define SDS_HEADER_VERSION_MASK			\
+	((1 << (SDS_HEADER_MINOR_VERSION_WIDTH + SDS_HEADER_MAJOR_VERSION_WIDTH)) - 1)
+
+#define SDS_HEADER_VERSION			MAKE_SDS_HEADER_VERSION(1, 0)
+#define SDS_HEADER_STRUCT_SIZE_WIDTH		23
+#define SDS_HEADER_STRUCT_SIZE_SHIFT		1
+#define SDS_HEADER_STRUCT_SIZE_MASK		((1 << SDS_HEADER_STRUCT_SIZE_WIDTH) - 1)
+#define SDS_HEADER_VALID_MASK			0x1
+#define SDS_HEADER_VALID_SHIFT			0
+#define SDS_HEADER_SIZE				0x8
+
+/* Arbitrary, 16 bit value that indicates a valid SDS Memory Region */
+#define SDS_REGION_SIGNATURE			0xAA7A
+#define SDS_REGION_SIGNATURE_WIDTH		16
+#define SDS_REGION_SIGNATURE_SHIFT		0
+#define SDS_REGION_SIGNATURE_MASK		((1 << SDS_REGION_SIGNATURE_WIDTH) - 1)
+
+#define SDS_REGION_STRUCT_COUNT_SHIFT		16
+#define SDS_REGION_STRUCT_COUNT_WIDTH		8
+#define SDS_REGION_STRUCT_COUNT_MASK		((1 << SDS_REGION_STRUCT_COUNT_WIDTH) - 1)
+
+#define SDS_REGION_SCH_MINOR_SHIFT		24
+#define SDS_REGION_SCH_MINOR_WIDTH		4
+#define SDS_REGION_SCH_MINOR_MASK		((1 << SDS_REGION_SCH_MINOR_WIDTH) - 1)
+
+#define SDS_REGION_SCH_MAJOR_SHIFT		28
+#define SDS_REGION_SCH_MAJOR_WIDTH		4
+#define SDS_REGION_SCH_MAJOR_MASK		((1 << SDS_REGION_SCH_MAJOR_WIDTH) - 1)
+
+#define SDS_REGION_SCH_VERSION_MASK		\
+	((1 << (SDS_REGION_SCH_MINOR_WIDTH + SDS_REGION_SCH_MAJOR_WIDTH)) - 1)
+
+#define MAKE_SDS_REGION_SCH_VERSION(maj, min)	\
+	((((maj) & SDS_REGION_SCH_MAJOR_MASK) << SDS_REGION_SCH_MINOR_WIDTH) |	\
+	((min) & SDS_REGION_SCH_MINOR_MASK))
+
+#define SDS_REGION_SCH_VERSION			MAKE_SDS_REGION_SCH_VERSION(1, 0)
+#define SDS_REGION_REGIONSIZE_OFFSET		0x4
+#define SDS_REGION_DESC_SIZE			0x8
+
+#ifndef __ASSEMBLY__
+#include <stddef.h>
+#include <stdint.h>
+
+/* Header containing Shared Data Structure metadata */
+typedef struct structure_header {
+	uint32_t reg[2];
+} struct_header_t;
+
+#define GET_SDS_HEADER_ID(header)			\
+	((((struct_header_t *)(header))->reg[0]) & SDS_HEADER_ID_MASK)
+#define GET_SDS_HEADER_VERSION(header)			\
+	(((((struct_header_t *)(header))->reg[0]) >> SDS_HEADER_MINOR_VERSION_SHIFT)\
+	& SDS_HEADER_VERSION_MASK)
+#define GET_SDS_HEADER_STRUCT_SIZE(header)		\
+	(((((struct_header_t *)(header))->reg[1]) >> SDS_HEADER_STRUCT_SIZE_SHIFT)\
+	& SDS_HEADER_STRUCT_SIZE_MASK)
+#define IS_SDS_HEADER_VALID(header)			\
+	((((struct_header_t *)(header))->reg[1]) & SDS_HEADER_VALID_MASK)
+#define GET_SDS_STRUCT_FIELD(header, field_offset)	\
+	((((uint8_t *)(header)) + sizeof(struct_header_t)) + (field_offset))
+
+/* Region Descriptor describing the SDS Memory Region */
+typedef struct region_descriptor {
+	uint32_t reg[2];
+} region_desc_t;
+
+#define IS_SDS_REGION_VALID(region)			\
+	(((((region_desc_t *)(region))->reg[0]) & SDS_REGION_SIGNATURE_MASK) == SDS_REGION_SIGNATURE)
+#define GET_SDS_REGION_STRUCTURE_COUNT(region)		\
+	(((((region_desc_t *)(region))->reg[0]) >> SDS_REGION_STRUCT_COUNT_SHIFT)\
+	& SDS_REGION_STRUCT_COUNT_MASK)
+#define GET_SDS_REGION_SCHEMA_VERSION(region)		\
+	(((((region_desc_t *)(region))->reg[0]) >> SDS_REGION_SCH_MINOR_SHIFT)\
+	& SDS_REGION_SCH_VERSION_MASK)
+#define GET_SDS_REGION_SIZE(region)		((((region_desc_t *)(region))->reg[1]))
+
+#endif /* __ASSEMBLY__ */
+#endif /* __SDS_PRIVATE_H__ */