1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/oprofile/event_buffer.h b/drivers/oprofile/event_buffer.h
new file mode 100644
index 000000000000..442aaad391e0
--- /dev/null
+++ b/drivers/oprofile/event_buffer.h
@@ -0,0 +1,48 @@
+/**
+ * @file event_buffer.h
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author John Levon <levon@movementarian.org>
+ */
+
+#ifndef EVENT_BUFFER_H
+#define EVENT_BUFFER_H
+
+#include <linux/types.h> 
+#include <asm/semaphore.h>
+ 
+int alloc_event_buffer(void);
+
+void free_event_buffer(void);
+ 
+/* wake up the process sleeping on the event file */
+void wake_up_buffer_waiter(void);
+ 
+/* Each escaped entry is prefixed by ESCAPE_CODE
+ * then one of the following codes, then the
+ * relevant data.
+ */
+#define ESCAPE_CODE                     ~0UL
+#define CTX_SWITCH_CODE                 1
+#define CPU_SWITCH_CODE                 2
+#define COOKIE_SWITCH_CODE              3
+#define KERNEL_ENTER_SWITCH_CODE        4
+#define KERNEL_EXIT_SWITCH_CODE         5
+#define MODULE_LOADED_CODE              6
+#define CTX_TGID_CODE                   7
+#define TRACE_BEGIN_CODE                8
+#define TRACE_END_CODE                  9
+ 
+/* add data to the event buffer */
+void add_event_entry(unsigned long data);
+ 
+extern struct file_operations event_buffer_fops;
+ 
+/* mutex between sync_cpu_buffers() and the
+ * file reading code.
+ */
+extern struct semaphore buffer_sem;
+ 
+#endif /* EVENT_BUFFER_H */