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21 results

reboot.h

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  • reboot.h 4.37 KiB
    /* 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	0x0001	/* Notify of system down */
    #define SYS_RESTART	SYS_DOWN
    #define SYS_HALT	0x0002	/* Notify of system halt */
    #define SYS_POWER_OFF	0x0003	/* 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:
    	 *
    	 * 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.
     */
    struct sys_off_data {
    	int mode;
    	void *cb_data;
    	const char *cmd;
    };
    
    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);
    void hw_protection_shutdown(const char *reason, int ms_until_forced);
    
    /*
     * Emergency restart, callable from an interrupt handler.
     */
    
    extern void emergency_restart(void);
    #include <asm/emergency-restart.h>
    
    #endif /* _LINUX_REBOOT_H */