sparc: Fix CPU counter support

The SPARC processors supported by RTEMS have no built-in CPU counter
support.  We have to use some hardware counter module for this purpose.
The BSP must provide a 32-bit register which contains the current CPU
counter value and a function for the difference calculation.  It can use
for example the GPTIMER instance used for the clock driver.

1 files changed, 34 insertions, 0 deletions

diff --git a/cpukit/score/cpu/sparc/sparc-counter.c b/cpukit/score/cpu/sparc/sparc-counter.c
new file mode 100644
index 0000000000..dc69b6baeb
--- /dev/null
+++ b/cpukit/score/cpu/sparc/sparc-counter.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2014 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/score/cpu.h>
+
+static CPU_Counter_ticks _SPARC_Counter_register_dummy;
+
+CPU_Counter_ticks _SPARC_Counter_difference_default(
+  CPU_Counter_ticks second,
+  CPU_Counter_ticks first
+)
+{
+  return 1;
+}
+
+SPARC_Counter _SPARC_Counter = {
+  .counter_register = &_SPARC_Counter_register_dummy,
+  .counter_difference = _SPARC_Counter_difference_default
+};