summaryrefslogtreecommitdiff
path: root/include/linux/sysrq.h
blob: d224c0bae8dfd62c612d605bd04b0609b938359e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
/* -*- linux-c -*-
 *
 *	$Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $
 *
 *	Linux Magic System Request Key Hacks
 *
 *	(c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
 *
 *	(c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
 *	overhauled to use key registration
 *	based upon discusions in irc://irc.openprojects.net/#kernelnewbies
 */

#ifndef _LINUX_SYSRQ_H
#define _LINUX_SYSRQ_H

#include <linux/errno.h>
#include <linux/types.h>

/* Enable/disable SYSRQ support by default (0==no, 1==yes). */
#define SYSRQ_DEFAULT_ENABLE	1

/* Possible values of bitmask for enabling sysrq functions */
/* 0x0001 is reserved for enable everything */
#define SYSRQ_ENABLE_LOG	0x0002
#define SYSRQ_ENABLE_KEYBOARD	0x0004
#define SYSRQ_ENABLE_DUMP	0x0008
#define SYSRQ_ENABLE_SYNC	0x0010
#define SYSRQ_ENABLE_REMOUNT	0x0020
#define SYSRQ_ENABLE_SIGNAL	0x0040
#define SYSRQ_ENABLE_BOOT	0x0080
#define SYSRQ_ENABLE_RTNICE	0x0100

struct sysrq_key_op {
	void (*handler)(int);
	char *help_msg;
	char *action_msg;
	int enable_mask;
};

#ifdef CONFIG_MAGIC_SYSRQ_FORCE_PRINTK
extern int sysrq_in_progress;
#else
#define sysrq_in_progress 0
#endif
#ifdef CONFIG_MAGIC_SYSRQ

/* Generic SysRq interface -- you may call it from any device driver, supplying
 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
 * are available -- else NULL's).
 */

void handle_sysrq(int key);
void __handle_sysrq(int key, bool check_mask);
int register_sysrq_key(int key, struct sysrq_key_op *op);
int unregister_sysrq_key(int key, struct sysrq_key_op *op);
struct sysrq_key_op *__sysrq_get_key_op(int key);

int sysrq_toggle_support(int enable_mask);

#else

static inline void handle_sysrq(int key)
{
}

static inline void __handle_sysrq(int key, bool check_mask)
{
}

static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
{
	return -EINVAL;
}

static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)
{
	return -EINVAL;
}

#endif

#endif /* _LINUX_SYSRQ_H */