1/* -*- 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
14#ifndef _LINUX_SYSRQ_H
15#define _LINUX_SYSRQ_H
16
17#include <linux/errno.h>
18#include <linux/types.h>
19
20/* Possible values of bitmask for enabling sysrq functions */
21/* 0x0001 is reserved for enable everything */
22#define SYSRQ_ENABLE_LOG	0x0002
23#define SYSRQ_ENABLE_KEYBOARD	0x0004
24#define SYSRQ_ENABLE_DUMP	0x0008
25#define SYSRQ_ENABLE_SYNC	0x0010
26#define SYSRQ_ENABLE_REMOUNT	0x0020
27#define SYSRQ_ENABLE_SIGNAL	0x0040
28#define SYSRQ_ENABLE_BOOT	0x0080
29#define SYSRQ_ENABLE_RTNICE	0x0100
30
31struct sysrq_key_op {
32	void (*handler)(int);
33	char *help_msg;
34	char *action_msg;
35	int enable_mask;
36};
37
38#ifdef CONFIG_MAGIC_SYSRQ
39
40/* Generic SysRq interface -- you may call it from any device driver, supplying
41 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
42 * are available -- else NULL's).
43 */
44
45void handle_sysrq(int key);
46void __handle_sysrq(int key, bool check_mask);
47int register_sysrq_key(int key, struct sysrq_key_op *op);
48int unregister_sysrq_key(int key, struct sysrq_key_op *op);
49struct sysrq_key_op *__sysrq_get_key_op(int key);
50
51int sysrq_toggle_support(int enable_mask);
52
53#else
54
55static inline void handle_sysrq(int key)
56{
57}
58
59static inline void __handle_sysrq(int key, bool check_mask)
60{
61}
62
63static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
64{
65	return -EINVAL;
66}
67
68static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)
69{
70	return -EINVAL;
71}
72
73#endif
74
75#endif /* _LINUX_SYSRQ_H */
76