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1da177e4 LT |
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 | ||
89bbc03c TP |
14 | #ifndef _LINUX_SYSRQ_H |
15 | #define _LINUX_SYSRQ_H | |
1da177e4 | 16 | |
82e3310a | 17 | #include <linux/errno.h> |
f335397d | 18 | #include <linux/types.h> |
1da177e4 | 19 | |
8c6a98b2 AW |
20 | /* Enable/disable SYSRQ support by default (0==no, 1==yes). */ |
21 | #define SYSRQ_DEFAULT_ENABLE 1 | |
22 | ||
1da177e4 LT |
23 | /* Possible values of bitmask for enabling sysrq functions */ |
24 | /* 0x0001 is reserved for enable everything */ | |
25 | #define SYSRQ_ENABLE_LOG 0x0002 | |
26 | #define SYSRQ_ENABLE_KEYBOARD 0x0004 | |
27 | #define SYSRQ_ENABLE_DUMP 0x0008 | |
28 | #define SYSRQ_ENABLE_SYNC 0x0010 | |
29 | #define SYSRQ_ENABLE_REMOUNT 0x0020 | |
30 | #define SYSRQ_ENABLE_SIGNAL 0x0040 | |
31 | #define SYSRQ_ENABLE_BOOT 0x0080 | |
32 | #define SYSRQ_ENABLE_RTNICE 0x0100 | |
33 | ||
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 | ||
f335397d DT |
48 | void handle_sysrq(int key); |
49 | void __handle_sysrq(int key, bool check_mask); | |
5d6f647f IM |
50 | int register_sysrq_key(int key, struct sysrq_key_op *op); |
51 | int unregister_sysrq_key(int key, struct sysrq_key_op *op); | |
1da177e4 LT |
52 | struct sysrq_key_op *__sysrq_get_key_op(int key); |
53 | ||
97f5f0cd DT |
54 | int sysrq_toggle_support(int enable_mask); |
55 | ||
1da177e4 LT |
56 | #else |
57 | ||
f335397d | 58 | static inline void handle_sysrq(int key) |
5d6f647f | 59 | { |
5d6f647f | 60 | } |
97f5f0cd | 61 | |
f335397d | 62 | static inline void __handle_sysrq(int key, bool check_mask) |
1495cc9d DT |
63 | { |
64 | } | |
65 | ||
97f5f0cd | 66 | static inline int register_sysrq_key(int key, struct sysrq_key_op *op) |
1da177e4 LT |
67 | { |
68 | return -EINVAL; | |
69 | } | |
97f5f0cd DT |
70 | |
71 | static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op) | |
5d6f647f | 72 | { |
97f5f0cd | 73 | return -EINVAL; |
5d6f647f | 74 | } |
1da177e4 | 75 | |
1da177e4 | 76 | #endif |
89bbc03c TP |
77 | |
78 | #endif /* _LINUX_SYSRQ_H */ |