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