blob: 98a1d8cfb73d1902d7f55466bc9aa034e8436b2b [file] [log] [blame]
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
17struct pt_regs;
18struct tty_struct;
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 {
David Howells7d12e782006-10-05 14:55:46 +010032 void (*handler)(int, struct tty_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 char *help_msg;
34 char *action_msg;
35 int enable_mask;
36};
37
38#ifdef CONFIG_MAGIC_SYSRQ
39
Ingo Molnar5d6f6472006-12-13 00:34:36 -080040extern int sysrq_on(void);
41
42/*
43 * Do not use this one directly:
44 */
45extern int __sysrq_enabled;
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047/* Generic SysRq interface -- you may call it from any device driver, supplying
48 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
49 * are available -- else NULL's).
50 */
51
Ingo Molnar5d6f6472006-12-13 00:34:36 -080052void handle_sysrq(int key, struct tty_struct *tty);
53void __handle_sysrq(int key, struct tty_struct *tty, int check_mask);
54int register_sysrq_key(int key, struct sysrq_key_op *op);
55int unregister_sysrq_key(int key, struct sysrq_key_op *op);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056struct sysrq_key_op *__sysrq_get_key_op(int key);
57
58#else
59
Ingo Molnar5d6f6472006-12-13 00:34:36 -080060static inline int sysrq_on(void)
61{
62 return 0;
63}
Linus Torvalds1da177e2005-04-16 15:20:36 -070064static inline int __reterr(void)
65{
66 return -EINVAL;
67}
Ingo Molnar5d6f6472006-12-13 00:34:36 -080068static inline void handle_sysrq(int key, struct tty_struct *tty)
69{
70}
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72#define register_sysrq_key(ig,nore) __reterr()
73#define unregister_sysrq_key(ig,nore) __reterr()
74
75#endif
Thomas Petazzoni89bbc032006-09-30 23:27:54 -070076
77#endif /* _LINUX_SYSRQ_H */