[rtems commit] bsps: Add simple CPU counter benchmark timer

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    b8e97e58a275f62d2a3aa2d708205592953afbfb
Changeset: http://git.rtems.org/rtems/commit/?id=b8e97e58a275f62d2a3aa2d708205592953afbfb

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Mon Mar 27 13:52:35 2017 +0200

bsps: Add simple CPU counter benchmark timer

---

 c/src/lib/libbsp/shared/timercpucounter.c | 35 +++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/c/src/lib/libbsp/shared/timercpucounter.c b/c/src/lib/libbsp/shared/timercpucounter.c
new file mode 100644
index 0000000..ade1c02
--- /dev/null
+++ b/c/src/lib/libbsp/shared/timercpucounter.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2017 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems at embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include <rtems/btimer.h>
+#include <rtems/counter.h>
+
+static uint32_t benchmark_timer_base;
+
+void benchmark_timer_initialize(void)
+{
+  benchmark_timer_base = rtems_counter_read();
+}
+
+benchmark_timer_t benchmark_timer_read(void)
+{
+  return rtems_counter_difference(rtems_counter_read(), benchmark_timer_base);
+}
+
+void benchmark_timer_disable_subtracting_average_overhead(
+  bool find_average_overhead
+)
+{
+  (void) find_average_overhead;
+}