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1 /* SPDX-License-Identifier: GPL-2.0 */
4 * $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $
6 * Linux Magic System Request Key Hacks
8 * (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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
15 #ifndef _LINUX_SYSRQ_H
16 #define _LINUX_SYSRQ_H
18 #include <linux/errno.h>
19 #include <linux/types.h>
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
32 #define SYSRQ_DISABLE_USERSPACE 0x00010000
41 #ifdef CONFIG_MAGIC_SYSRQ
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).
48 #define SYSRQ_FROM_KERNEL 0x0001
49 #define SYSRQ_FROM_PROC 0x0002
50 #define SYSRQ_FROM_SYNTHETIC 0x0004
52 void handle_sysrq(int key
);
53 void __handle_sysrq(int key
, unsigned int from
);
54 int register_sysrq_key(int key
, struct sysrq_key_op
*op
);
55 int unregister_sysrq_key(int key
, struct sysrq_key_op
*op
);
56 struct sysrq_key_op
*__sysrq_get_key_op(int key
);
58 int sysrq_toggle_support(int enable_mask
);
62 static inline void handle_sysrq(int key
)
66 static inline void __handle_sysrq(int key
, bool check_mask
)
70 static inline int register_sysrq_key(int key
, struct sysrq_key_op
*op
)
75 static inline int unregister_sysrq_key(int key
, struct sysrq_key_op
*op
)
82 #endif /* _LINUX_SYSRQ_H */