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 #ifndef _LINUX_SYSRQ_H
15 #define _LINUX_SYSRQ_H
16
17 #include <linux/errno.h>
18 #include <linux/types.h>
19
20 /* Enable/disable SYSRQ support by default (0==no, 1==yes). */
21 #define SYSRQ_DEFAULT_ENABLE 1
22
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 {
35 void (*handler)(int);
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
48 void handle_sysrq(int key);
49 void __handle_sysrq(int key, bool check_mask);
50 int register_sysrq_key(int key, struct sysrq_key_op *op);
51 int unregister_sysrq_key(int key, struct sysrq_key_op *op);
52 struct sysrq_key_op *__sysrq_get_key_op(int key);
53
54 int sysrq_toggle_support(int enable_mask);
55
56 #else
57
handle_sysrq(int key)58 static inline void handle_sysrq(int key)
59 {
60 }
61
__handle_sysrq(int key,bool check_mask)62 static inline void __handle_sysrq(int key, bool check_mask)
63 {
64 }
65
register_sysrq_key(int key,struct sysrq_key_op * op)66 static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
67 {
68 return -EINVAL;
69 }
70
unregister_sysrq_key(int key,struct sysrq_key_op * op)71 static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)
72 {
73 return -EINVAL;
74 }
75
76 #endif
77
78 #endif /* _LINUX_SYSRQ_H */
79