1. 根目录:
2. include
3. linux
4. reboot.h

#ifndef _LINUX_REBOOT_H
#define _LINUX_REBOOT_H


#include <linux/notifier.h>
#include <uapi/linux/reboot.h>

#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 */

extern int register_reboot_notifier(struct notifier_block *);
extern int unregister_reboot_notifier(struct notifier_block *);


/*
 * Architecture-specific implementations of sys_reboot commands.
 */

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 *);

/* 
 * 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 int C_A_D; /* for sysctl */
void ctrl_alt_del(void);

#define POWEROFF_CMD_PATH_LEN	256
extern char poweroff_cmd[POWEROFF_CMD_PATH_LEN];

extern int orderly_poweroff(bool force);

/*
 * Emergency restart, callable from an interrupt handler.
 */

extern void emergency_restart(void);
#include <asm/emergency-restart.h>

#endif /* _LINUX_REBOOT_H */