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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* -*- linux-c -*-
2 *
3 * $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $
4 *
5 * Linux Magic System Request Key Hacks
6 *
7 * (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
8 *
9 * (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
10 * overhauled to use key registration
11 * based upon discusions in irc://irc.openprojects.net/#kernelnewbies
12 */
13
Thomas Petazzoni89bbc032006-09-30 23:27:54 -070014#ifndef _LINUX_SYSRQ_H
15#define _LINUX_SYSRQ_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Tobias Doerffel82e33102009-07-05 12:08:23 -070017#include <linux/errno.h>
Dmitry Torokhovf3353972010-08-17 21:15:47 -070018#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Andy Whitcroft8c6a98b2011-01-24 09:31:38 -080020/* Enable/disable SYSRQ support by default (0==no, 1==yes). */
21#define SYSRQ_DEFAULT_ENABLE 1
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023/* Possible values of bitmask for enabling sysrq functions */
24/* 0x0001 is reserved for enable everything */
25#define SYSRQ_ENABLE_LOG 0x0002
26#define SYSRQ_ENABLE_KEYBOARD 0x0004
27#define SYSRQ_ENABLE_DUMP 0x0008
28#define SYSRQ_ENABLE_SYNC 0x0010
29#define SYSRQ_ENABLE_REMOUNT 0x0020
30#define SYSRQ_ENABLE_SIGNAL 0x0040
31#define SYSRQ_ENABLE_BOOT 0x0080
32#define SYSRQ_ENABLE_RTNICE 0x0100
33
34struct sysrq_key_op {
Dmitry Torokhov1495cc92010-08-17 21:15:46 -070035 void (*handler)(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 char *help_msg;
37 char *action_msg;
38 int enable_mask;
39};
40
41#ifdef CONFIG_MAGIC_SYSRQ
42
43/* Generic SysRq interface -- you may call it from any device driver, supplying
44 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
45 * are available -- else NULL's).
46 */
47
Dmitry Torokhovf3353972010-08-17 21:15:47 -070048void handle_sysrq(int key);
49void __handle_sysrq(int key, bool check_mask);
Ingo Molnar5d6f6472006-12-13 00:34:36 -080050int register_sysrq_key(int key, struct sysrq_key_op *op);
51int unregister_sysrq_key(int key, struct sysrq_key_op *op);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052struct sysrq_key_op *__sysrq_get_key_op(int key);
53
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -070054int sysrq_toggle_support(int enable_mask);
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#else
57
Dmitry Torokhovf3353972010-08-17 21:15:47 -070058static inline void handle_sysrq(int key)
Ingo Molnar5d6f6472006-12-13 00:34:36 -080059{
60}
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Dmitry Torokhovf3353972010-08-17 21:15:47 -070062static inline void __handle_sysrq(int key, bool check_mask)
Dmitry Torokhov1495cc92010-08-17 21:15:46 -070063{
64}
65
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -070066static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
67{
68 return -EINVAL;
69}
70
71static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)
72{
73 return -EINVAL;
74}
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76#endif
Thomas Petazzoni89bbc032006-09-30 23:27:54 -070077
78#endif /* _LINUX_SYSRQ_H */