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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#include <linux/config.h>
15
16struct pt_regs;
17struct tty_struct;
18
19/* Possible values of bitmask for enabling sysrq functions */
20/* 0x0001 is reserved for enable everything */
21#define SYSRQ_ENABLE_LOG 0x0002
22#define SYSRQ_ENABLE_KEYBOARD 0x0004
23#define SYSRQ_ENABLE_DUMP 0x0008
24#define SYSRQ_ENABLE_SYNC 0x0010
25#define SYSRQ_ENABLE_REMOUNT 0x0020
26#define SYSRQ_ENABLE_SIGNAL 0x0040
27#define SYSRQ_ENABLE_BOOT 0x0080
28#define SYSRQ_ENABLE_RTNICE 0x0100
29
30struct sysrq_key_op {
31 void (*handler)(int, struct pt_regs *, struct tty_struct *);
32 char *help_msg;
33 char *action_msg;
34 int enable_mask;
35};
36
37#ifdef CONFIG_MAGIC_SYSRQ
38
39/* Generic SysRq interface -- you may call it from any device driver, supplying
40 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
41 * are available -- else NULL's).
42 */
43
44void handle_sysrq(int, struct pt_regs *, struct tty_struct *);
45void __handle_sysrq(int, struct pt_regs *, struct tty_struct *, int check_mask);
46int register_sysrq_key(int, struct sysrq_key_op *);
47int unregister_sysrq_key(int, struct sysrq_key_op *);
48struct sysrq_key_op *__sysrq_get_key_op(int key);
49
50#else
51
52static inline int __reterr(void)
53{
54 return -EINVAL;
55}
56
57#define register_sysrq_key(ig,nore) __reterr()
58#define unregister_sysrq_key(ig,nore) __reterr()
59
60#endif