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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 <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 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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