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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
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 {
32 void (*handler)(int, struct tty_struct *);
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, struct tty_struct *);
46void __handle_sysrq(int, struct tty_struct *, int check_mask);
47int register_sysrq_key(int, struct sysrq_key_op *);
48int unregister_sysrq_key(int, struct sysrq_key_op *);
49struct sysrq_key_op *__sysrq_get_key_op(int key);
50
51#else
52
53static inline int __reterr(void)
54{
55 return -EINVAL;
56}
57
58#define register_sysrq_key(ig,nore) __reterr()
59#define unregister_sysrq_key(ig,nore) __reterr()
60
61#endif
62
63#endif /* _LINUX_SYSRQ_H */