1 files changed, 63 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/mips/csb350/timer/timer.c b/c/src/lib/libbsp/mips/csb350/timer/timer.c
new file mode 100644
index 0000000000..7dd684db1a
--- /dev/null
+++ b/c/src/lib/libbsp/mips/csb350/timer/timer.c
@@ -0,0 +1,63 @@
+/* 
+ *  This file implements a benchmark timer using the count/compare
+ *  CP0 registers.
+ *
+ *  Copyright (c) 2005 by Cogent Computer Systems
+ *  Written by Jay Monkman <jtm@lopingdog.com>
+ *	
+ *  The license and distribution terms for this file may be
+ *  found in found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <assert.h>
+
+#include <bsp.h>
+
+rtems_boolean Timer_driver_Find_average_overhead;
+unsigned32 tstart;
+
+void Timer_initialize()
+{
+    asm volatile ("mfc0 %0, $9\n" : "=r" (tstart));
+    /* tick time in picooseconds */
+}
+
+#define AVG_OVERHEAD      0  /* It typically takes N instructions */
+                             /*     to start/stop the timer. */
+#define LEAST_VALID       1  /* Don't trust a value lower than this */
+                             /* tx39 simulator can count instructions. :) */
+
+int Read_timer()
+{
+  unsigned32  total;
+  unsigned32  cnt;
+
+  asm volatile ("mfc0 %0, $9\n" : "=r" (cnt));
+
+  total = cnt - tstart;
+  total = (total * 1000) / 396; /* convert to nanoseconds */
+
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in one microsecond units */
+
+  if ( total < LEAST_VALID )
+    return 0;            /* below timer resolution */
+
+  return total - AVG_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;
+}