diff --git a/include/lib/aarch64/arch.h b/include/lib/aarch64/arch.h
index 215730d..2da0630 100644
--- a/include/lib/aarch64/arch.h
+++ b/include/lib/aarch64/arch.h
@@ -159,6 +159,25 @@
 #define ID_AA64MMFR0_EL1_PARANGE_SHIFT	U(0)
 #define ID_AA64MMFR0_EL1_PARANGE_MASK	ULL(0xf)
 
+/* ID_AA64ISAR1_EL1 definitions */
+#define ID_AA64ISAR1_GPI_SHIFT	U(28)
+#define ID_AA64ISAR1_GPI_WIDTH	U(4)
+#define ID_AA64ISAR1_GPA_SHIFT	U(24)
+#define ID_AA64ISAR1_GPA_WIDTH	U(4)
+#define ID_AA64ISAR1_API_SHIFT	U(8)
+#define ID_AA64ISAR1_API_WIDTH	U(4)
+#define ID_AA64ISAR1_APA_SHIFT	U(4)
+#define ID_AA64ISAR1_APA_WIDTH	U(4)
+
+#define ID_AA64ISAR1_GPI_MASK \
+	(((ULL(1) << ID_AA64ISAR1_GPI_WIDTH) - ULL(1)) << ID_AA64ISAR1_GPI_SHIFT)
+#define ID_AA64ISAR1_GPA_MASK \
+	(((ULL(1) << ID_AA64ISAR1_GPA_WIDTH) - ULL(1)) << ID_AA64ISAR1_GPA_SHIFT)
+#define ID_AA64ISAR1_API_MASK \
+	(((ULL(1) << ID_AA64ISAR1_API_WIDTH) - ULL(1)) << ID_AA64ISAR1_API_SHIFT)
+#define ID_AA64ISAR1_APA_MASK \
+	(((ULL(1) << ID_AA64ISAR1_APA_WIDTH) - ULL(1)) << ID_AA64ISAR1_APA_SHIFT)
+
 #define PARANGE_0000	U(32)
 #define PARANGE_0001	U(36)
 #define PARANGE_0010	U(40)
@@ -618,4 +637,9 @@
 #define ERXPFGCTL_UEU_BIT	(1 << 2)
 #define ERXPFGCTL_CDEN_BIT	(1 << 31)
 
+/*******************************************************************************
+ * Armv8.3 Pointer Authentication Registers
+ *******************************************************************************/
+#define APGAKeyLo_EL1		S3_0_C2_C3_0
+
 #endif /* __ARCH_H__ */
diff --git a/include/lib/aarch64/arch_helpers.h b/include/lib/aarch64/arch_helpers.h
index c313d60..0bd52de 100644
--- a/include/lib/aarch64/arch_helpers.h
+++ b/include/lib/aarch64/arch_helpers.h
@@ -128,6 +128,7 @@
  ******************************************************************************/
 
 DEFINE_SYSREG_READ_FUNC(id_pfr1_el1)
+DEFINE_SYSREG_READ_FUNC(id_aa64isar1_el1)
 DEFINE_SYSREG_READ_FUNC(id_aa64pfr0_el1)
 DEFINE_SYSREG_READ_FUNC(CurrentEl)
 DEFINE_SYSREG_READ_FUNC(ctr_el0)
@@ -323,6 +324,9 @@
 DEFINE_RENAME_SYSREG_RW_FUNCS(amcntenclr1_el0, AMCNTENCLR1_EL0)
 DEFINE_RENAME_SYSREG_RW_FUNCS(amcntenset1_el0, AMCNTENSET1_EL0)
 
+/* Armv8.3 Pointer Authentication Registers */
+DEFINE_RENAME_SYSREG_RW_FUNCS(apgakeylo_el1, APGAKeyLo_EL1)
+
 #define IS_IN_EL(x) \
 	(GET_EL(read_CurrentEl()) == MODE_EL##x)