1 files changed, 70 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/powerpc/mpc5xx/timer/timer.c b/c/src/lib/libcpu/powerpc/mpc5xx/timer/timer.c
new file mode 100644
index 0000000000..f7741dcfe3
--- /dev/null
+++ b/c/src/lib/libcpu/powerpc/mpc5xx/timer/timer.c
@@ -0,0 +1,70 @@
+/*  timer.c
+ *
+ *  This file manages the benchmark timer used by the RTEMS Timing Test
+ *  Suite.  Each measured time period is demarcated by calls to
+ *  Timer_initialize() and Read_timer().  Read_timer() usually returns
+ *  the number of microseconds since Timer_initialize() exitted.
+ *
+ *  NOTE: It is important that the timer start/stop overhead be
+ *        determined when porting or modifying this code.
+ *
+ *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
+ *  On-Line Applications Research Corporation (OAR).
+ *  All rights assigned to U.S. Government, 1994.
+ *
+ *  This material may be reproduced by or for the U.S. Government pursuant
+ *  to the copyright license under the clause at DFARS 252.227-7013.  This
+ *  notice must appear in all copies of this file and its derivatives.
+ *
+ *  timer.c,v 1.2 1995/05/31 16:56:39 joel Exp
+ */
+
+#include <rtems.h>
+
+rtems_boolean Timer_driver_Find_average_overhead;
+
+static unsigned int volatile lastInitValue;
+
+void Timer_initialize( void )
+{
+  asm volatile( " mftb %0": "=r" (lastInitValue) );
+}
+
+/*
+ *  The following controls the behavior of Read_timer().
+ *
+ *  AVG_OVEREHAD is the overhead for starting and stopping the timer.  It
+ *  is usually deducted from the number returned.
+ *
+ *  LEAST_VALID is the lowest number this routine should trust.  Numbers
+ *  below this are "noise" and zero is returned.
+ */
+
+#define AVG_OVERHEAD      0  /* It typically takes X.X microseconds */
+                             /* (Y countdowns) to start/stop the timer. */
+                             /* This value is in microseconds. */
+#define LEAST_VALID       1  /* Don't trust a clicks value lower than this */
+
+int Read_timer( void )
+{
+  rtems_unsigned32 value;
+  asm volatile ( " mftb %0": "=r" (value) );
+  return value - lastInitValue;
+}
+
+/*
+ *  Empty function call used in loops to measure basic cost of looping
+ *  in Timing Test Suite.
+ */
+
+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;
+}