1 files changed, 51 insertions, 0 deletions
diff --git a/src/usr/trace/TraceBuffer.H b/src/usr/trace/TraceBuffer.H
new file mode 100644
index 000000000..4ac416eac
--- /dev/null
+++ b/src/usr/trace/TraceBuffer.H
@@ -0,0 +1,51 @@
+#ifndef __TRACE_TRACEBUFFER_H
+#define __TRACE_TRACEBUFFER_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <new>
+#include <limits.h>
+#include <sys/task.h>
+
+struct traceEntry
+{
+    uint64_t component;
+    tid_t tid;
+    uint16_t length;
+    uint32_t hash;
+    uint64_t timestamp;
+    uint32_t line;
+    uint64_t values[0];
+};
+
+
+class TracePage
+{
+    public:
+        TracePage() : next(NULL), size(0) {};
+
+        TracePage* setNext(TracePage*);
+        TracePage* getNext() { return next; };
+        traceEntry* claimEntry(size_t size);
+
+    private:
+        TracePage* volatile next;
+        uint64_t size;
+};
+
+class TraceBuffer
+{
+    public:
+        TraceBuffer()
+            {
+                first = last = new (malloc(PAGE_SIZE)) TracePage();
+            }
+
+        traceEntry* claimEntry(size_t size);
+
+    private:
+        TracePage* first;
+        TracePage* volatile last;
+};
+
+#endif