cpukit/rtems: Add rtems_clock_get_uptime_nanoseconds to the RTEMS API.

Add Timestamp support in the score to return a timestamp in nanoseconds.
Add a test.
Update the RTEMS API documentation.

1 files changed, 35 insertions, 0 deletions

diff --git a/cpukit/rtems/src/clockgetuptimenanoseconds.c b/cpukit/rtems/src/clockgetuptimenanoseconds.c
new file mode 100644
index 0000000000..c07a4305db
--- /dev/null
+++ b/cpukit/rtems/src/clockgetuptimenanoseconds.c
@@ -0,0 +1,35 @@
+/**
+ * @file
+ *
+ * @brief Returns the system uptime in seconds.
+ * @ingroup ClassicClock Clocks
+ */
+
+/*
+ * Copyright (c) 2013 Chris Johns <chrisj@rtems.org>.  All rights reserved.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/rtems/clock.h>
+#include <rtems/score/todimpl.h>
+
+uint64_t rtems_clock_get_uptime_nanoseconds( void )
+{
+  Timestamp_Control  snapshot_as_timestamp;
+  uint32_t           nanoseconds;
+  ISR_Level          level;
+
+  _TOD_Acquire( &_TOD, level );
+    snapshot_as_timestamp = _TOD.uptime;
+    nanoseconds = ( *_TOD.nanoseconds_since_last_tick )();
+  _TOD_Release( &_TOD, level );
+
+  return _Timestamp_Get_As_nanoseconds( &snapshot_as_timestamp, nanoseconds );
+}