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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>
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019struct 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 {
David Howells7d12e782006-10-05 14:55:46 +010034 void (*handler)(int, struct tty_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 char *help_msg;
36 char *action_msg;
37 int enable_mask;
38};
39
40#ifdef CONFIG_MAGIC_SYSRQ
41
Ingo Molnar5d6f6472006-12-13 00:34:36 -080042extern int sysrq_on(void);
43
44/*
45 * Do not use this one directly:
46 */
47extern int __sysrq_enabled;
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049/* Generic SysRq interface -- you may call it from any device driver, supplying
50 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
51 * are available -- else NULL's).
52 */
53
Ingo Molnar5d6f6472006-12-13 00:34:36 -080054void handle_sysrq(int key, struct tty_struct *tty);
55void __handle_sysrq(int key, struct tty_struct *tty, int check_mask);
56int register_sysrq_key(int key, struct sysrq_key_op *op);
57int unregister_sysrq_key(int key, struct sysrq_key_op *op);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058struct sysrq_key_op *__sysrq_get_key_op(int key);
59
60#else
61
Ingo Molnar5d6f6472006-12-13 00:34:36 -080062static inline int sysrq_on(void)
63{
64 return 0;
65}
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static inline int __reterr(void)
67{
68 return -EINVAL;
69}
Ingo Molnar5d6f6472006-12-13 00:34:36 -080070static inline void handle_sysrq(int key, struct tty_struct *tty)
71{
72}
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74#define register_sysrq_key(ig,nore) __reterr()
75#define unregister_sysrq_key(ig,nore) __reterr()
76
77#endif
Thomas Petazzoni89bbc032006-09-30 23:27:54 -070078
79#endif /* _LINUX_SYSRQ_H */