diff --git a/include/arch/aarch64/arch.h b/include/arch/aarch64/arch.h
index 92e6737..9d4ad3b 100644
--- a/include/arch/aarch64/arch.h
+++ b/include/arch/aarch64/arch.h
@@ -259,6 +259,9 @@
 #define MTE_IMPLEMENTED_EL0	ULL(1)	/* MTE is only implemented at EL0 */
 #define MTE_IMPLEMENTED_ELX	ULL(2)	/* MTE is implemented at all ELs */
 
+#define ID_AA64PFR1_MPAM_FRAC_SHIFT	ULL(16)
+#define ID_AA64PFR1_MPAM_FRAC_MASK	ULL(0xf)
+
 /* ID_PFR1_EL1 definitions */
 #define ID_PFR1_VIRTEXT_SHIFT	U(12)
 #define ID_PFR1_VIRTEXT_MASK	U(0xf)