1 files changed, 49 insertions, 0 deletions

diff --git a/include/litmus/feather_trace.h b/include/litmus/feather_trace.h
new file mode 100644
index 000000000000..7d27e763406f
--- /dev/null
+++ b/include/litmus/feather_trace.h
@@ -0,0 +1,49 @@
+#ifndef _FEATHER_TRACE_H_
+#define _FEATHER_TRACE_H_
+
+#include <asm/atomic.h>
+#include <asm/feather_trace.h>
+
+int ft_enable_event(unsigned long id);
+int ft_disable_event(unsigned long id);
+int ft_is_event_enabled(unsigned long id);
+int ft_disable_all_events(void);
+
+/* atomic_* funcitons are inline anyway */
+static inline int fetch_and_inc(int *val)
+{
+        return atomic_add_return(1, (atomic_t*) val) - 1;
+}
+
+static inline int fetch_and_dec(int *val)
+{
+        return atomic_sub_return(1, (atomic_t*) val) + 1;
+}
+
+#ifndef __ARCH_HAS_FEATHER_TRACE
+/* provide default implementation */
+
+#define feather_callback
+
+#define MAX_EVENTS 1024
+
+extern int ft_events[MAX_EVENTS];
+
+#define ft_event(id, callback) \
+        if (ft_events[id]) callback();
+
+#define ft_event0(id, callback) \
+        if (ft_events[id]) callback(id);
+
+#define ft_event1(id, callback, param) \
+        if (ft_events[id]) callback(id, param);
+
+#define ft_event2(id, callback, param, param2) \
+        if (ft_events[id]) callback(id, param, param2);
+
+#define ft_event3(id, callback, p, p2, p3) \
+        if (ft_events[id]) callback(id, p, p2, p3);
+
+#endif
+
+#endif