1 files changed, 85 insertions, 0 deletions
diff --git a/bsps/sparc/leon3/btimer/btimer.c b/bsps/sparc/leon3/btimer/btimer.c
new file mode 100644
index 0000000000..40bdeb87bb
--- /dev/null
+++ b/bsps/sparc/leon3/btimer/btimer.c
@@ -0,0 +1,85 @@
+/*  timer.c
+ *
+ *  This file implements a benchmark timer using timer 2.
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ *
+ *  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.
+ */
+
+
+#include <bsp.h>
+#include <rtems/btimer.h>
+
+#if defined(RTEMS_MULTIPROCESSING)
+  #define LEON3_TIMER_INDEX \
+      ((rtems_configuration_get_user_multiprocessing_table()) ? \
+        (rtems_configuration_get_user_multiprocessing_table()->node) - 1 : 1)
+#else
+  #define LEON3_TIMER_INDEX 0
+#endif
+
+bool benchmark_timer_find_average_overhead;
+
+bool benchmark_timer_is_initialized = false;
+
+extern volatile struct gptimer_regs *LEON3_Timer_Regs;
+
+void benchmark_timer_initialize(void)
+{
+  /*
+   *  Timer runs long and accurate enough not to require an interrupt.
+   */
+  if (LEON3_Timer_Regs) {
+    if ( benchmark_timer_is_initialized == false ) {
+      /* approximately 1 us per countdown */
+      LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].reload = 0xffffff;
+      LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].value = 0xffffff;
+    } else {
+      benchmark_timer_is_initialized = true;
+    }
+    LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].ctrl =
+      GPTIMER_TIMER_CTRL_EN | GPTIMER_TIMER_CTRL_LD;
+  }
+}
+
+#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 */
+
+benchmark_timer_t benchmark_timer_read(void)
+{
+  uint32_t total;
+
+  if (LEON3_Timer_Regs) {
+    total = LEON3_Timer_Regs->timer[LEON3_TIMER_INDEX].value;
+
+    total = 0xffffff - total;
+
+    if ( benchmark_timer_find_average_overhead == true )
+      return total;          /* in one microsecond units */
+
+    if ( total < LEAST_VALID )
+      return 0;            /* below timer resolution */
+
+    return total - AVG_OVERHEAD;
+  }
+  return 0;
+}
+
+void benchmark_timer_disable_subtracting_average_overhead(
+  bool find_flag
+)
+{
+  benchmark_timer_find_average_overhead = find_flag;
+}