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- /* SPDX-License-Identifier: GPL-2.0 */
- /* -*- linux-c -*-
- *
- * $Id: sysrq.h,v 1.3 1997/07/17 11:54:33 mj Exp $
- *
- * Linux Magic System Request Key Hacks
- *
- * (c) 1997 Martin Mares <[email protected]>
- *
- * (c) 2000 Crutcher Dunnavant <[email protected]>
- * overhauled to use key registration
- * based upon discusions in irc://irc.openprojects.net/#kernelnewbies
- */
- #ifndef _LINUX_SYSRQ_H
- #define _LINUX_SYSRQ_H
- #include <linux/errno.h>
- #include <linux/types.h>
- /* Possible values of bitmask for enabling sysrq functions */
- /* 0x0001 is reserved for enable everything */
- #define SYSRQ_ENABLE_LOG 0x0002
- #define SYSRQ_ENABLE_KEYBOARD 0x0004
- #define SYSRQ_ENABLE_DUMP 0x0008
- #define SYSRQ_ENABLE_SYNC 0x0010
- #define SYSRQ_ENABLE_REMOUNT 0x0020
- #define SYSRQ_ENABLE_SIGNAL 0x0040
- #define SYSRQ_ENABLE_BOOT 0x0080
- #define SYSRQ_ENABLE_RTNICE 0x0100
- struct sysrq_key_op {
- void (* const handler)(int);
- const char * const help_msg;
- const char * const action_msg;
- const int enable_mask;
- };
- #ifdef CONFIG_MAGIC_SYSRQ
- /* Generic SysRq interface -- you may call it from any device driver, supplying
- * ASCII code of the key, pointer to registers and kbd/tty structs (if they
- * are available -- else NULL's).
- */
- void handle_sysrq(int key);
- void __handle_sysrq(int key, bool check_mask);
- int register_sysrq_key(int key, const struct sysrq_key_op *op);
- int unregister_sysrq_key(int key, const struct sysrq_key_op *op);
- extern const struct sysrq_key_op *__sysrq_reboot_op;
- int sysrq_toggle_support(int enable_mask);
- int sysrq_mask(void);
- #else
- static inline void handle_sysrq(int key)
- {
- }
- static inline void __handle_sysrq(int key, bool check_mask)
- {
- }
- static inline int register_sysrq_key(int key, const struct sysrq_key_op *op)
- {
- return -EINVAL;
- }
- static inline int unregister_sysrq_key(int key, const struct sysrq_key_op *op)
- {
- return -EINVAL;
- }
- static inline int sysrq_mask(void)
- {
- /* Magic SysRq disabled mask */
- return 0;
- }
- #endif
- #endif /* _LINUX_SYSRQ_H */
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