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1/**
2 * @file event_buffer.h
3 *
4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
6 *
7 * @author John Levon <levon@movementarian.org>
8 */
9
10#ifndef EVENT_BUFFER_H
11#define EVENT_BUFFER_H
12
13#include <linux/types.h>
14#include <asm/semaphore.h>
15
16int alloc_event_buffer(void);
17
18void free_event_buffer(void);
19
20/* wake up the process sleeping on the event file */
21void wake_up_buffer_waiter(void);
22
23/* Each escaped entry is prefixed by ESCAPE_CODE
24 * then one of the following codes, then the
25 * relevant data.
26 */
27#define ESCAPE_CODE ~0UL
28#define CTX_SWITCH_CODE 1
29#define CPU_SWITCH_CODE 2
30#define COOKIE_SWITCH_CODE 3
31#define KERNEL_ENTER_SWITCH_CODE 4
32#define KERNEL_EXIT_SWITCH_CODE 5
33#define MODULE_LOADED_CODE 6
34#define CTX_TGID_CODE 7
35#define TRACE_BEGIN_CODE 8
36#define TRACE_END_CODE 9
37
38#define INVALID_COOKIE ~0UL
39#define NO_COOKIE 0UL
40
41/* add data to the event buffer */
42void add_event_entry(unsigned long data);
43
44extern struct file_operations event_buffer_fops;
45
46/* mutex between sync_cpu_buffers() and the
47 * file reading code.
48 */
49extern struct semaphore buffer_sem;
50
51#endif /* EVENT_BUFFER_H */