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 /* Possible values of bitmask for enabling sysrq functions */
21 /* 0x0001 is reserved for enable everything */
22 #define SYSRQ_ENABLE_LOG 0x0002
23 #define SYSRQ_ENABLE_KEYBOARD 0x0004
24 #define SYSRQ_ENABLE_DUMP 0x0008
25 #define SYSRQ_ENABLE_SYNC 0x0010
26 #define SYSRQ_ENABLE_REMOUNT 0x0020
27 #define SYSRQ_ENABLE_SIGNAL 0x0040
28 #define SYSRQ_ENABLE_BOOT 0x0080
29 #define SYSRQ_ENABLE_RTNICE 0x0100
30
31 struct sysrq_key_op {
32 void (*handler)(int);
33 char *help_msg;
34 char *action_msg;
35 int enable_mask;
36 };
37
38 #ifdef CONFIG_MAGIC_SYSRQ
39
40 /* Generic SysRq interface -- you may call it from any device driver, supplying
41 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
42 * are available -- else NULL's).
43 */
44
45 void handle_sysrq(int key);
46 void __handle_sysrq(int key, bool check_mask);
47 int register_sysrq_key(int key, struct sysrq_key_op *op);
48 int unregister_sysrq_key(int key, struct sysrq_key_op *op);
49 struct sysrq_key_op *__sysrq_get_key_op(int key);
50
51 int sysrq_toggle_support(int enable_mask);
52
53 #else
54
handle_sysrq(int key)55 static inline void handle_sysrq(int key)
56 {
57 }
58
__handle_sysrq(int key,bool check_mask)59 static inline void __handle_sysrq(int key, bool check_mask)
60 {
61 }
62
register_sysrq_key(int key,struct sysrq_key_op * op)63 static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
64 {
65 return -EINVAL;
66 }
67
unregister_sysrq_key(int key,struct sysrq_key_op * op)68 static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)
69 {
70 return -EINVAL;
71 }
72
73 #endif
74
75 #endif /* _LINUX_SYSRQ_H */
76