1 files changed, 49 insertions, 0 deletions
diff --git a/cpukit/score/src/smplock.c b/cpukit/score/src/smplock.c
new file mode 100644
index 0000000000..1dd691835b
--- /dev/null
+++ b/cpukit/score/src/smplock.c
@@ -0,0 +1,49 @@
+/*
+ *  COPYRIGHT (c) 1989-2011.
+ *  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.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/score/smplock.h>
+
+void _SMP_lock_Spinlock_Initialize(
+  SMP_lock_Control *lock
+)
+{
+  *lock = 0;
+}
+
+ISR_Level _SMP_lock_Spinlock_Obtain(
+  SMP_lock_Control *lock
+)
+{
+  ISR_Level  level;
+  uint32_t   value = 1;
+  uint32_t   previous;
+
+  /* Note: Disable provides an implicit memory barrier. */
+  _ISR_Disable( level );
+    do {
+      SMP_CPU_SWAP( lock, value, previous );
+    } while (previous == 1);
+  return level;
+}
+
+void _SMP_lock_Spinlock_Release(
+  SMP_lock_Control *lock,
+  ISR_Level        level
+)
+{
+  *lock = 0;
+  _ISR_Enable( level );
+}