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