diff --git a/sys/arm64/include/armreg.h b/sys/arm64/include/armreg.h
index bcbe9d13863d..19be64316fbc 100644
--- a/sys/arm64/include/armreg.h
+++ b/sys/arm64/include/armreg.h
@@ -1187,6 +1187,13 @@
 #define	TCR_SMP_ATTRS	0
 #endif
 
+/* TTBR0_EL1 & TTBR1_EL1 - Translation Table Base Register 0 & 1 */
+#define	TTBR_ASID_SHIFT		48
+#define	TTBR_ASID_MASK		(0xfffful << TTBR_ASID_SHIFT)
+#define	TTBR_BADDR		0x0000fffffffffffeul
+#define	TTBR_CnP_SHIFT		0
+#define	TTBR_CnP		(1ul << TTBR_CnP_SHIFT)
+
 /* Saved Program Status Register */
 #define	DBG_SPSR_SS	(0x1 << 21)