diff --git a/sys/arm64/include/armreg.h b/sys/arm64/include/armreg.h
--- a/sys/arm64/include/armreg.h
+++ b/sys/arm64/include/armreg.h
@@ -2377,6 +2377,8 @@
 #define	PMCR_X				(1ul << 4) /* Export to ext. monitoring (ETM) */
 #define	PMCR_DP				(1ul << 5) /* Disable CCNT if non-invasive debug*/
 #define	PMCR_LC				(1ul << 6) /* Long cycle count enable */
+#define	PMCR_LP				(1ul << 7) /* Long event count enable */
+#define	PMCR_FZO			(1ul << 9) /* Freeze-on-overflow */
 #define	PMCR_N_SHIFT			11  /* Number of counters implemented */
 #define	PMCR_N_MASK			(0x1ful << PMCR_N_SHIFT)
 #define	PMCR_IDCODE_SHIFT		16	/* Identification code */
@@ -2395,6 +2397,7 @@
 #define	PMCR_IMP_SHIFT			24	/* Implementer code */
 #define	PMCR_IMP_MASK			(0xfful << PMCR_IMP_SHIFT)
 #define	 PMCR_IMP_ARM			0x41
+#define	PMCR_FZS			(1ul << 32) /* Freeze-on-SPE event */
 
 /* PMEVCNTR<n>_EL0 */
 #define	PMEVCNTR_EL0_op0		3