diff --git a/include/lib/aarch32/arch.h b/include/lib/aarch32/arch.h
index 56163c8..5fbb83a 100644
--- a/include/lib/aarch32/arch.h
+++ b/include/lib/aarch32/arch.h
@@ -7,6 +7,8 @@
 #ifndef __ARCH_H__
 #define __ARCH_H__
 
+#include <utils_def.h>
+
 /*******************************************************************************
  * MIDR bit definitions
  ******************************************************************************/
@@ -459,4 +461,53 @@
 #define ICC_ASGI1R_EL1_64	p15, 1, c12
 #define ICC_SGI0R_EL1_64	p15, 2, c12
 
+/*******************************************************************************
+ * Definitions of MAIR encodings for device and normal memory
+ ******************************************************************************/
+/*
+ * MAIR encodings for device memory attributes.
+ */
+#define MAIR_DEV_nGnRnE		U(0x0)
+#define MAIR_DEV_nGnRE		U(0x4)
+#define MAIR_DEV_nGRE		U(0x8)
+#define MAIR_DEV_GRE		U(0xc)
+
+/*
+ * MAIR encodings for normal memory attributes.
+ *
+ * Cache Policy
+ *  WT:	 Write Through
+ *  WB:	 Write Back
+ *  NC:	 Non-Cacheable
+ *
+ * Transient Hint
+ *  NTR: Non-Transient
+ *  TR:	 Transient
+ *
+ * Allocation Policy
+ *  RA:	 Read Allocate
+ *  WA:	 Write Allocate
+ *  RWA: Read and Write Allocate
+ *  NA:	 No Allocation
+ */
+#define MAIR_NORM_WT_TR_WA	U(0x1)
+#define MAIR_NORM_WT_TR_RA	U(0x2)
+#define MAIR_NORM_WT_TR_RWA	U(0x3)
+#define MAIR_NORM_NC		U(0x4)
+#define MAIR_NORM_WB_TR_WA	U(0x5)
+#define MAIR_NORM_WB_TR_RA	U(0x6)
+#define MAIR_NORM_WB_TR_RWA	U(0x7)
+#define MAIR_NORM_WT_NTR_NA	U(0x8)
+#define MAIR_NORM_WT_NTR_WA	U(0x9)
+#define MAIR_NORM_WT_NTR_RA	U(0xa)
+#define MAIR_NORM_WT_NTR_RWA	U(0xb)
+#define MAIR_NORM_WB_NTR_NA	U(0xc)
+#define MAIR_NORM_WB_NTR_WA	U(0xd)
+#define MAIR_NORM_WB_NTR_RA	U(0xe)
+#define MAIR_NORM_WB_NTR_RWA	U(0xf)
+
+#define MAIR_NORM_OUTER_SHIFT	4
+
+#define MAKE_MAIR_NORMAL_MEMORY(inner, outer)	((inner) | ((outer) << MAIR_NORM_OUTER_SHIFT))
+
 #endif /* __ARCH_H__ */
diff --git a/include/lib/aarch64/arch.h b/include/lib/aarch64/arch.h
index 2adf769..e38a530 100644
--- a/include/lib/aarch64/arch.h
+++ b/include/lib/aarch64/arch.h
@@ -504,4 +504,53 @@
 #define PMCR_EL0_N_MASK		U(0x1f)
 #define PMCR_EL0_N_BITS		(PMCR_EL0_N_MASK << PMCR_EL0_N_SHIFT)
 
+/*******************************************************************************
+ * Definitions of MAIR encodings for device and normal memory
+ ******************************************************************************/
+/*
+ * MAIR encodings for device memory attributes.
+ */
+#define MAIR_DEV_nGnRnE		ULL(0x0)
+#define MAIR_DEV_nGnRE		ULL(0x4)
+#define MAIR_DEV_nGRE		ULL(0x8)
+#define MAIR_DEV_GRE		ULL(0xc)
+
+/*
+ * MAIR encodings for normal memory attributes.
+ *
+ * Cache Policy
+ *  WT:	 Write Through
+ *  WB:	 Write Back
+ *  NC:	 Non-Cacheable
+ *
+ * Transient Hint
+ *  NTR: Non-Transient
+ *  TR:	 Transient
+ *
+ * Allocation Policy
+ *  RA:	 Read Allocate
+ *  WA:	 Write Allocate
+ *  RWA: Read and Write Allocate
+ *  NA:	 No Allocation
+ */
+#define MAIR_NORM_WT_TR_WA	ULL(0x1)
+#define MAIR_NORM_WT_TR_RA	ULL(0x2)
+#define MAIR_NORM_WT_TR_RWA	ULL(0x3)
+#define MAIR_NORM_NC		ULL(0x4)
+#define MAIR_NORM_WB_TR_WA	ULL(0x5)
+#define MAIR_NORM_WB_TR_RA	ULL(0x6)
+#define MAIR_NORM_WB_TR_RWA	ULL(0x7)
+#define MAIR_NORM_WT_NTR_NA	ULL(0x8)
+#define MAIR_NORM_WT_NTR_WA	ULL(0x9)
+#define MAIR_NORM_WT_NTR_RA	ULL(0xa)
+#define MAIR_NORM_WT_NTR_RWA	ULL(0xb)
+#define MAIR_NORM_WB_NTR_NA	ULL(0xc)
+#define MAIR_NORM_WB_NTR_WA	ULL(0xd)
+#define MAIR_NORM_WB_NTR_RA	ULL(0xe)
+#define MAIR_NORM_WB_NTR_RWA	ULL(0xf)
+
+#define MAIR_NORM_OUTER_SHIFT	4
+
+#define MAKE_MAIR_NORMAL_MEMORY(inner, outer)	((inner) | ((outer) << MAIR_NORM_OUTER_SHIFT))
+
 #endif /* __ARCH_H__ */
diff --git a/include/lib/xlat_tables/xlat_tables_defs.h b/include/lib/xlat_tables/xlat_tables_defs.h
index 008ae9b..b0f5a04 100644
--- a/include/lib/xlat_tables/xlat_tables_defs.h
+++ b/include/lib/xlat_tables/xlat_tables_defs.h
@@ -7,6 +7,7 @@
 #ifndef __XLAT_TABLES_DEFS_H__
 #define __XLAT_TABLES_DEFS_H__
 
+#include <arch.h>
 #include <utils_def.h>
 
 /* Miscellaneous MMU related constants */
@@ -96,12 +97,13 @@
 #define ATTR_DEVICE_INDEX		U(0x1)
 #define ATTR_IWBWA_OWBWA_NTR_INDEX	U(0x0)
 #define LOWER_ATTRS(x)			(((x) & U(0xfff)) << 2)
+
 /* Normal Memory, Outer Write-Through non-transient, Inner Non-cacheable */
-#define ATTR_NON_CACHEABLE		U(0x44)
+#define ATTR_NON_CACHEABLE		MAKE_MAIR_NORMAL_MEMORY(MAIR_NORM_NC, MAIR_NORM_NC)
 /* Device-nGnRE */
-#define ATTR_DEVICE			U(0x4)
+#define ATTR_DEVICE			MAIR_DEV_nGnRE
 /* Normal Memory, Outer Write-Back non-transient, Inner Write-Back non-transient */
-#define ATTR_IWBWA_OWBWA_NTR		U(0xff)
+#define ATTR_IWBWA_OWBWA_NTR		MAKE_MAIR_NORMAL_MEMORY(MAIR_NORM_WB_NTR_RWA, MAIR_NORM_WB_NTR_RWA)
 #define MAIR_ATTR_SET(attr, index)	((attr) << ((index) << 3))
 #define ATTR_INDEX_MASK			U(0x3)
 #define ATTR_INDEX_GET(attr)		(((attr) >> 2) & ATTR_INDEX_MASK)