| /* 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 <mj@atrey.karlin.mff.cuni.cz> |
| * |
| * (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
| * 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 */ |