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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
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 | ||
89bbc03c TP |
15 | #ifndef _LINUX_SYSRQ_H |
16 | #define _LINUX_SYSRQ_H | |
1da177e4 | 17 | |
82e3310a | 18 | #include <linux/errno.h> |
f335397d | 19 | #include <linux/types.h> |
1da177e4 LT |
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 | ||
531c25a3 KM |
32 | #define SYSRQ_DISABLE_USERSPACE 0x00010000 |
33 | ||
1da177e4 | 34 | struct sysrq_key_op { |
1495cc9d | 35 | void (*handler)(int); |
1da177e4 LT |
36 | char *help_msg; |
37 | char *action_msg; | |
38 | int enable_mask; | |
39 | }; | |
40 | ||
41 | #ifdef CONFIG_MAGIC_SYSRQ | |
42 | ||
43 | /* Generic SysRq interface -- you may call it from any device driver, supplying | |
44 | * ASCII code of the key, pointer to registers and kbd/tty structs (if they | |
45 | * are available -- else NULL's). | |
46 | */ | |
47 | ||
531c25a3 KM |
48 | #define SYSRQ_FROM_KERNEL 0x0001 |
49 | #define SYSRQ_FROM_PROC 0x0002 | |
50 | #define SYSRQ_FROM_SYNTHETIC 0x0004 | |
51 | ||
f335397d | 52 | void handle_sysrq(int key); |
531c25a3 | 53 | void __handle_sysrq(int key, unsigned int from); |
5d6f647f IM |
54 | int register_sysrq_key(int key, struct sysrq_key_op *op); |
55 | int unregister_sysrq_key(int key, struct sysrq_key_op *op); | |
1da177e4 LT |
56 | struct sysrq_key_op *__sysrq_get_key_op(int key); |
57 | ||
97f5f0cd DT |
58 | int sysrq_toggle_support(int enable_mask); |
59 | ||
1da177e4 LT |
60 | #else |
61 | ||
f335397d | 62 | static inline void handle_sysrq(int key) |
5d6f647f | 63 | { |
5d6f647f | 64 | } |
97f5f0cd | 65 | |
f335397d | 66 | static inline void __handle_sysrq(int key, bool check_mask) |
1495cc9d DT |
67 | { |
68 | } | |
69 | ||
97f5f0cd | 70 | static inline int register_sysrq_key(int key, struct sysrq_key_op *op) |
1da177e4 LT |
71 | { |
72 | return -EINVAL; | |
73 | } | |
97f5f0cd DT |
74 | |
75 | static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op) | |
5d6f647f | 76 | { |
97f5f0cd | 77 | return -EINVAL; |
5d6f647f | 78 | } |
1da177e4 | 79 | |
1da177e4 | 80 | #endif |
89bbc03c TP |
81 | |
82 | #endif /* _LINUX_SYSRQ_H */ |