From b21b0ab3e77d91fc32e4324d3dfaf57ce24096ab Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Mon, 13 Nov 2000 22:40:29 +0000
Subject: 2000-11-13	Jiri Gaisler <jgais@ws.estec.esa.nl>

	* .cvsignore, ChangeLog, Makefile.am, README, bsp_specs,
	configure.in, times, clock/.cvsignore, clock/Makefile.am,
	clock/ckinit.c, console/.cvsignore, console/Makefile.am,
	console/console.c, console/consolereserveresources.c,
	console/debugputs.c, gnatsupp/.cvsignore,
	gnatsupp/Makefile.am, gnatsupp/gnatsupp.c,
	include/.cvsignore, include/Makefile.am, include/bsp.h,
	include/coverhd.h, include/leon.h, start/.cvsignore,
	start/Makefile.am, startup/.cvsignore, startup/Makefile.am,
	startup/boardinit.S, startup/linkcmds, startup/setvec.c,
	startup/spurious.c, timer/.cvsignore, timer/Makefile.am,
	timer/timer.c, tools/.cvsignore, tools/Makefile.am,
	tools/configure.in, tools/runtest.in, wrapup/.cvsignore,
	wrapup/Makefile.am: New file.
---
 c/src/lib/libbsp/sparc/leon/timer/timer.c | 84 +++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 c/src/lib/libbsp/sparc/leon/timer/timer.c

(limited to 'c/src/lib/libbsp/sparc/leon/timer/timer.c')

diff --git a/c/src/lib/libbsp/sparc/leon/timer/timer.c b/c/src/lib/libbsp/sparc/leon/timer/timer.c
new file mode 100644
index 0000000000..190d4dd313
--- /dev/null
+++ b/c/src/lib/libbsp/sparc/leon/timer/timer.c
@@ -0,0 +1,84 @@
+/*  timer.c
+ *
+ *  This file implements a benchmark timer using timer 2.
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  Ported to LEON implementation of the SPARC by On-Line Applications
+ *  Research Corporation (OAR) under contract to the European Space 
+ *  Agency (ESA).
+ *
+ *  LEON modifications of respective RTEMS file: COPYRIGHT (c) 1995. 
+ *  European Space Agency.
+ *
+ *  $Id$
+ */
+
+
+#include <bsp.h>
+
+rtems_boolean Timer_driver_Find_average_overhead;
+
+rtems_boolean Timer_driver_Is_initialized = FALSE;
+
+void Timer_initialize()
+{
+  /*
+   *  Timer runs long and accurate enough not to require an interrupt.
+   */
+
+  if ( Timer_driver_Is_initialized == FALSE ) {
+
+    /* approximately 1 us per countdown */
+    LEON_REG.Timer_Counter_2 = 0xffffff;
+    LEON_REG.Timer_Reload_2 = 0xffffff;
+
+  } else {
+    Timer_driver_Is_initialized = TRUE;
+  }
+
+  LEON_REG.Timer_Control_2 = ( 
+    LEON_REG_TIMER_COUNTER_ENABLE_COUNTING | 
+      LEON_REG_TIMER_COUNTER_LOAD_COUNTER
+  );
+
+}
+
+#define AVG_OVERHEAD      3  /* It typically takes 3.0 microseconds */
+                             /*     to start/stop the timer. */
+#define LEAST_VALID       2  /* Don't trust a value lower than this */
+
+int Read_timer()
+{
+  rtems_unsigned32  total;
+
+  total = LEON_REG.Timer_Counter_2;
+
+  total = 0xffffff - total;
+
+  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;
+}
-- 
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