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.

3 files changed, 43 insertions, 0 deletions

diff --git a/cpukit/rtems/Makefile.am b/cpukit/rtems/Makefile.am
index c8fcfa6bd2..fd5af5aaa1 100644
--- a/cpukit/rtems/Makefile.am
+++ b/cpukit/rtems/Makefile.am
@@ -151,6 +151,7 @@ librtems_a_SOURCES += src/clockgettodtimeval.c
 librtems_a_SOURCES += src/clockgetuptime.c
 librtems_a_SOURCES += src/clockgetuptimetimeval.c
 librtems_a_SOURCES += src/clockgetuptimeseconds.c
+librtems_a_SOURCES += src/clockgetuptimenanoseconds.c
 librtems_a_SOURCES += src/clockset.c
 librtems_a_SOURCES += src/clocksetnsecshandler.c
 librtems_a_SOURCES += src/clocktick.c
diff --git a/cpukit/rtems/include/rtems/rtems/clock.h b/cpukit/rtems/include/rtems/rtems/clock.h
index e933a5e31a..dc5901ab0d 100644
--- a/cpukit/rtems/include/rtems/rtems/clock.h
+++ b/cpukit/rtems/include/rtems/rtems/clock.h
@@ -257,6 +257,13 @@ void rtems_clock_get_uptime_timeval( struct timeval *uptime );
 time_t rtems_clock_get_uptime_seconds( void );
 
 /**
+ * @brief Returns the system uptime in nanoseconds.
+ *
+ * @retval The system uptime in nanoseconds.
+ */
+uint64_t rtems_clock_get_uptime_nanoseconds( void );
+
+/**
  * @brief TOD Validate
  *
  * This support function returns true if @a the_tod contains
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 );
+}