1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /* -*- linux-c -*-
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Linux Magic System Request Key Hacks
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
11*4882a593Smuzhiyun * overhauled to use key registration
12*4882a593Smuzhiyun * based upon discusions in irc://irc.openprojects.net/#kernelnewbies
13*4882a593Smuzhiyun */
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #ifndef _LINUX_SYSRQ_H
16*4882a593Smuzhiyun #define _LINUX_SYSRQ_H
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include <linux/errno.h>
19*4882a593Smuzhiyun #include <linux/types.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun /* Possible values of bitmask for enabling sysrq functions */
22*4882a593Smuzhiyun /* 0x0001 is reserved for enable everything */
23*4882a593Smuzhiyun #define SYSRQ_ENABLE_LOG 0x0002
24*4882a593Smuzhiyun #define SYSRQ_ENABLE_KEYBOARD 0x0004
25*4882a593Smuzhiyun #define SYSRQ_ENABLE_DUMP 0x0008
26*4882a593Smuzhiyun #define SYSRQ_ENABLE_SYNC 0x0010
27*4882a593Smuzhiyun #define SYSRQ_ENABLE_REMOUNT 0x0020
28*4882a593Smuzhiyun #define SYSRQ_ENABLE_SIGNAL 0x0040
29*4882a593Smuzhiyun #define SYSRQ_ENABLE_BOOT 0x0080
30*4882a593Smuzhiyun #define SYSRQ_ENABLE_RTNICE 0x0100
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun struct sysrq_key_op {
33*4882a593Smuzhiyun void (* const handler)(int);
34*4882a593Smuzhiyun const char * const help_msg;
35*4882a593Smuzhiyun const char * const action_msg;
36*4882a593Smuzhiyun const int enable_mask;
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun #ifdef CONFIG_MAGIC_SYSRQ
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun /* Generic SysRq interface -- you may call it from any device driver, supplying
42*4882a593Smuzhiyun * ASCII code of the key, pointer to registers and kbd/tty structs (if they
43*4882a593Smuzhiyun * are available -- else NULL's).
44*4882a593Smuzhiyun */
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun void handle_sysrq(int key);
47*4882a593Smuzhiyun void __handle_sysrq(int key, bool check_mask);
48*4882a593Smuzhiyun int register_sysrq_key(int key, const struct sysrq_key_op *op);
49*4882a593Smuzhiyun int unregister_sysrq_key(int key, const struct sysrq_key_op *op);
50*4882a593Smuzhiyun extern const struct sysrq_key_op *__sysrq_reboot_op;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun int sysrq_toggle_support(int enable_mask);
53*4882a593Smuzhiyun int sysrq_mask(void);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun #else
56*4882a593Smuzhiyun
handle_sysrq(int key)57*4882a593Smuzhiyun static inline void handle_sysrq(int key)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
__handle_sysrq(int key,bool check_mask)61*4882a593Smuzhiyun static inline void __handle_sysrq(int key, bool check_mask)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
register_sysrq_key(int key,const struct sysrq_key_op * op)65*4882a593Smuzhiyun static inline int register_sysrq_key(int key, const struct sysrq_key_op *op)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun return -EINVAL;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
unregister_sysrq_key(int key,const struct sysrq_key_op * op)70*4882a593Smuzhiyun static inline int unregister_sysrq_key(int key, const struct sysrq_key_op *op)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun return -EINVAL;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
sysrq_mask(void)75*4882a593Smuzhiyun static inline int sysrq_mask(void)
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun /* Magic SysRq disabled mask */
78*4882a593Smuzhiyun return 0;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun #endif
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun #endif /* _LINUX_SYSRQ_H */
84