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