/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_REBOOT_H
#define _LINUX_REBOOT_H
#include <linux/notifier.h>
#include <uapi/linux/reboot.h>
struct device;
struct sys_off_handler;
#define SYS_DOWN 0 x0001 /* Notify of system down */
#define SYS_RESTART SYS_DOWN
#define SYS_HALT 0 x0002 /* Notify of system halt */
#define SYS_POWER_OFF 0 x0003 /* Notify of system power off */
enum reboot_mode {
REBOOT_UNDEFINED = -1 ,
REBOOT_COLD = 0 ,
REBOOT_WARM,
REBOOT_HARD,
REBOOT_SOFT,
REBOOT_GPIO,
};
extern enum reboot_mode reboot_mode;
extern enum reboot_mode panic_reboot_mode;
enum reboot_type {
BOOT_TRIPLE = 't' ,
BOOT_KBD = 'k' ,
BOOT_BIOS = 'b' ,
BOOT_ACPI = 'a' ,
BOOT_EFI = 'e' ,
BOOT_CF9_FORCE = 'p' ,
BOOT_CF9_SAFE = 'q' ,
};
extern enum reboot_type reboot_type;
extern int reboot_default;
extern int reboot_cpu;
extern int reboot_force;
extern int register_reboot_notifier(struct notifier_block *);
extern int unregister_reboot_notifier(struct notifier_block *);
extern int devm_register_reboot_notifier(struct device *, struct notifier_block *);
extern int register_restart_handler(struct notifier_block *);
extern int unregister_restart_handler(struct notifier_block *);
extern void do_kernel_restart(char *cmd);
/*
* Architecture - specific implementations of sys_reboot commands .
*/
extern void migrate_to_reboot_cpu(void );
extern void machine_restart(char *cmd);
extern void machine_halt(void );
extern void machine_power_off(void );
extern void machine_shutdown(void );
struct pt_regs;
extern void machine_crash_shutdown(struct pt_regs *);
void do_kernel_power_off(void );
/*
* sys - off handler API .
*/
/*
* Standard sys - off priority levels . Users are expected to set priorities
* relative to the standard levels .
*
* SYS_OFF_PRIO_PLATFORM : Use this for platform - level handlers .
*
* SYS_OFF_PRIO_LOW : Use this for handler of last resort .
*
* SYS_OFF_PRIO_DEFAULT : Use this for normal handlers .
*
* SYS_OFF_PRIO_HIGH : Use this for higher priority handlers .
*
* SYS_OFF_PRIO_FIRMWARE : Use this if handler uses firmware call .
*/
#define SYS_OFF_PRIO_PLATFORM -256
#define SYS_OFF_PRIO_LOW -128
#define SYS_OFF_PRIO_DEFAULT 0
#define SYS_OFF_PRIO_HIGH 192
#define SYS_OFF_PRIO_FIRMWARE 224
enum sys_off_mode {
/**
* @ SYS_OFF_MODE_POWER_OFF_PREPARE :
*
* Handlers prepare system to be powered off . Handlers are
* allowed to sleep .
*/
SYS_OFF_MODE_POWER_OFF_PREPARE,
/**
* @ SYS_OFF_MODE_POWER_OFF :
*
* Handlers power - off system . Handlers are disallowed to sleep .
*/
SYS_OFF_MODE_POWER_OFF,
/**
* @ SYS_OFF_MODE_RESTART_PREPARE :
*
* Handlers prepare system to be restarted . Handlers are
* allowed to sleep .
*/
SYS_OFF_MODE_RESTART_PREPARE,
/**
* @ SYS_OFF_MODE_RESTART :
*
* Handlers restart system . Handlers are disallowed to sleep .
*/
SYS_OFF_MODE_RESTART,
};
/**
* struct sys_off_data - sys - off callback argument
*
* @ mode : Mode ID . Currently used only by the sys - off restart mode ,
* see enum reboot_mode for the available modes .
* @ cb_data : User ' s callback data .
* @ cmd : Command string . Currently used only by the sys - off restart mode ,
* NULL otherwise .
* @ dev : Device of the sys - off handler . Only if known ( devm_register_ * ) ,
* NULL otherwise .
*/
struct sys_off_data {
int mode;
void *cb_data;
const char *cmd;
struct device *dev;
};
struct sys_off_handler *
register_sys_off_handler(enum sys_off_mode mode,
int priority,
int (*callback)(struct sys_off_data *data),
void *cb_data);
void unregister_sys_off_handler(struct sys_off_handler *handler);
int devm_register_sys_off_handler(struct device *dev,
enum sys_off_mode mode,
int priority,
int (*callback)(struct sys_off_data *data),
void *cb_data);
int devm_register_power_off_handler(struct device *dev,
int (*callback)(struct sys_off_data *data),
void *cb_data);
int devm_register_restart_handler(struct device *dev,
int (*callback)(struct sys_off_data *data),
void *cb_data);
int register_platform_power_off(void (*power_off)(void ));
void unregister_platform_power_off(void (*power_off)(void ));
/*
* Architecture independent implemenations of sys_reboot commands .
*/
extern void kernel_restart_prepare(char *cmd);
extern void kernel_restart(char *cmd);
extern void kernel_halt(void );
extern void kernel_power_off(void );
extern bool kernel_can_power_off(void );
void ctrl_alt_del(void );
extern void orderly_poweroff(bool force);
extern void orderly_reboot(void );
/**
* enum hw_protection_action - Hardware protection action
*
* @ HWPROT_ACT_DEFAULT :
* The default action should be taken . This is HWPROT_ACT_SHUTDOWN
* by default , but can be overridden .
* @ HWPROT_ACT_SHUTDOWN :
* The system should be shut down ( powered off ) for HW protection .
* @ HWPROT_ACT_REBOOT :
* The system should be rebooted for HW protection .
*/
enum hw_protection_action { HWPROT_ACT_DEFAULT, HWPROT_ACT_SHUTDOWN, HWPROT_ACT_REBOOT };
void __hw_protection_trigger(const char *reason, int ms_until_forced,
enum hw_protection_action action);
/**
* hw_protection_trigger - Trigger default emergency system hardware protection action
*
* @ reason : Reason of emergency shutdown or reboot to be printed .
* @ ms_until_forced : Time to wait for orderly shutdown or reboot before
* triggering it . Negative value disables the forced
* shutdown or reboot .
*
* Initiate an emergency system shutdown or reboot in order to protect
* hardware from further damage . The exact action taken is controllable at
* runtime and defaults to shutdown .
*/
static inline void hw_protection_trigger(const char *reason, int ms_until_forced)
{
__hw_protection_trigger(reason, ms_until_forced, HWPROT_ACT_DEFAULT);
}
/*
* Emergency restart , callable from an interrupt handler .
*/
extern void emergency_restart(void );
#include <asm /emergency-restart.h>
#endif /* _LINUX_REBOOT_H */
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