Index: linux/tests/cycles.h
===================================================================
--- /dev/null
+++ linux/tests/cycles.h
@@ -0,0 +1,30 @@
+
+#define CYCLES read_pmccntr()
+// #define CYCLES get_cycles()
+
+
+static void arm_pmu_mode(bool on)
+{
+	u64 val = read_pmcr() & ~ARMV8_PMU_PMCR_MASK;
+
+	val |= ARMV8_PMU_PMCR_LP | ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C | ARMV8_PMU_PMCR_LC;
+
+	if (on) {
+		/* Enable counter */
+		write_sysreg_s(0x08000000, SYS_PMCCFILTR_EL0);	 	/* BIT 27 set. NSH */
+		write_sysreg_s(0x80000000, SYS_PMINTENCLR_EL1);		/* Disable Interrupt on overflow */
+		write_sysreg_s(0x8000000f, SYS_PMCNTENSET_EL0);		/* Enable Counters */
+//		write_sysreq_s(0x00000005, SYS_PMUSERENR_EL0);		/* User access allowed */
+		write_sysreg_s(0x8000000f, SYS_PMOVSCLR_EL0);		/* Disable and clear overflow */
+
+		val |= ARMV8_PMU_PMCR_E;
+	}
+
+	isb();
+	write_pmcr(val);
+
+}
+
+#define CYCLES_ENABLE arm_pmu_mode(true)
+#define CYCLES_DISABLE arm_pmu_mode(false)
+