1 files changed, 100 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/powerpc/mpc6xx/timer/timer.c b/c/src/lib/libcpu/powerpc/mpc6xx/timer/timer.c
new file mode 100644
index 0000000000..307cfcac6b
--- /dev/null
+++ b/c/src/lib/libcpu/powerpc/mpc6xx/timer/timer.c
@@ -0,0 +1,100 @@
+/*  timer.c
+ *
+ *  This file implements a benchmark timer using the General Purpose Timer.
+ *
+ *  Notes:
+ *
+ *  BSP_TIMER_AVG_OVERHEAD and BSP_TIMER_LEAST_VALID are required to be
+ *  provided in bsp.h
+ *
+ *  COPYRIGHT (c) 1989-1997.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may in
+ *  the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <assert.h>
+#include <libcpu/cpu.h>
+#include <bsp.h>
+
+rtems_unsigned64 Timer_driver_Start_time;
+
+rtems_boolean Timer_driver_Find_average_overhead = 0;
+unsigned clicks_overhead = 0;
+
+/*
+ * Timer Get overhead
+ */
+
+int Timer_get_clicks_overhead()
+{
+  rtems_unsigned64  clicks;
+
+  PPC_Set_timebase_register((unsigned64) 0);
+  clicks = PPC_Get_timebase_register();
+  assert(clicks <= 0xffffffff);
+  clicks_overhead = (unsigned) clicks;
+  return clicks_overhead;
+}
+
+/*
+ * Timer_initialize 
+ */
+void Timer_initialize()
+{
+
+  /*
+   *  Timer runs long and accurate enough not to require an interrupt.
+   */
+
+  if (clicks_overhead == 0) clicks_overhead = Timer_get_clicks_overhead();
+  PPC_Set_timebase_register((unsigned64) 0);
+}
+
+
+/*
+ *  Read_timer
+ */
+int Read_timer()
+{
+  rtems_unsigned64  total64;
+  rtems_unsigned32  total;
+
+  /* approximately CLOCK_SPEED clicks per microsecond */
+
+  total64 = PPC_Get_timebase_register();
+
+  assert( total64 <= 0xffffffff );  /* fits into a unsigned32 */
+
+  total = (rtems_unsigned32) total64;
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in "clicks" of the decrementer units */
+
+  return (int) BSP_Convert_decrementer(total - clicks_overhead);
+}
+
+unsigned long long Read_long_timer()
+{
+  rtems_unsigned64  total64;
+
+  total64 = PPC_Get_timebase_register();
+  return BSP_Convert_decrementer(total64 - clicks_overhead);
+}
+
+rtems_status_code Empty_function( void )
+{
+  return RTEMS_SUCCESSFUL;
+}
+
+void Set_find_average_overhead(
+  rtems_boolean find_flag
+)
+{
+  Timer_driver_Find_average_overhead = find_flag;
+}