1 files changed, 70 insertions, 0 deletions
diff --git a/platform/linux-generic/arch/x86/odp_time_cpu.c b/platform/linux-generic/arch/x86/odp_time_cpu.c
new file mode 100644
index 000000000..aa00ac04e
--- /dev/null
+++ b/platform/linux-generic/arch/x86/odp_time_cpu.c
@@ -0,0 +1,70 @@
+/* Copyright (c) 2015-2018, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+#include <odp_posix_extensions.h>
+
+#include <odp/api/hints.h>
+#include <odp/api/time_types.h>
+
+#include <odp/api/abi/time_cpu.h>
+
+#include <odp_debug_internal.h>
+
+#include <time.h>
+
+/* Measure TSC frequency. Frequency information registers are defined for x86,
+ * but those are often not enumerated. */
+uint64_t _odp_time_cpu_global_freq(void)
+{
+	struct timespec sleep, ts1, ts2;
+	uint64_t t1, t2, ts_nsec, cycles, hz;
+	int i;
+	uint64_t avg = 0;
+	int rounds = 3;
+	int warm_up = 1;
+
+	for (i = 0; i < rounds; i++) {
+		sleep.tv_sec = 0;
+
+		if (warm_up)
+			sleep.tv_nsec = ODP_TIME_SEC_IN_NS / 1000;
+		else
+			sleep.tv_nsec = ODP_TIME_SEC_IN_NS / 4;
+
+		if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts1)) {
+			_ODP_ERR("clock_gettime() failed\n");
+			return 0;
+		}
+
+		t1 = _odp_time_cpu_global();
+
+		if (nanosleep(&sleep, NULL) < 0) {
+			_ODP_ERR("nanosleep() failed\n");
+			return 0;
+		}
+
+		if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts2)) {
+			_ODP_ERR("clock_gettime() failed\n");
+			return 0;
+		}
+
+		t2 = _odp_time_cpu_global();
+
+		ts_nsec  = (ts2.tv_sec - ts1.tv_sec) * ODP_TIME_SEC_IN_NS;
+		ts_nsec += ts2.tv_nsec - ts1.tv_nsec;
+
+		cycles = t2 - t1;
+
+		hz = (cycles * ODP_TIME_SEC_IN_NS) / ts_nsec;
+
+		if (warm_up)
+			warm_up = 0;
+		else
+			avg += hz;
+	}
+
+	return avg / (rounds - 1);
+}