1 files changed, 31 insertions, 0 deletions
diff --git a/xen/include/public/trace.h b/xen/include/public/trace.h
new file mode 100644
index 0000000000..5e7904d52a
--- /dev/null
+++ b/xen/include/public/trace.h
@@ -0,0 +1,31 @@
+/******************************************************************************
+ * trace.h
+ */
+
+#ifndef __XEN_PUBLIC_TRACE_H__
+#define __XEN_PUBLIC_TRACE_H__
+
+/* This structure represents a single trace buffer record. */
+struct t_rec {
+    u64 cycles;               /* 64 bit cycle counter timestamp */
+    u32 event;                /* 32 bit event ID                */
+    u32 d1, d2, d3, d4, d5;   /* event data items               */
+};
+
+/*
+ * This structure contains the metadata for a single trace buffer.  The head
+ * field, indexes into an array of struct t_rec's.
+ */
+struct t_buf {
+    unsigned long data;      /* pointer to data area.  machine address
+                              * for convenience in user space code           */
+
+    unsigned long size;      /* size of the data area, in t_recs             */
+    unsigned long head;      /* array index of the most recent record        */
+
+    /* Xen-private elements follow... */
+    struct t_rec *head_ptr; /* pointer to the head record                    */
+    struct t_rec *vdata;    /* virtual address pointer to data               */
+};
+
+#endif /* __XEN_PUBLIC_TRACE_H__ */