1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_REBOOT_H
3 #define _LINUX_REBOOT_H
4 
5 
6 #include <linux/notifier.h>
7 #include <uapi/linux/reboot.h>
8 
9 struct device;
10 struct sys_off_handler;
11 
12 #define SYS_DOWN	0x0001	/* Notify of system down */
13 #define SYS_RESTART	SYS_DOWN
14 #define SYS_HALT	0x0002	/* Notify of system halt */
15 #define SYS_POWER_OFF	0x0003	/* Notify of system power off */
16 
17 enum reboot_mode {
18 	REBOOT_UNDEFINED = -1,
19 	REBOOT_COLD = 0,
20 	REBOOT_WARM,
21 	REBOOT_HARD,
22 	REBOOT_SOFT,
23 	REBOOT_GPIO,
24 };
25 extern enum reboot_mode reboot_mode;
26 extern enum reboot_mode panic_reboot_mode;
27 
28 enum reboot_type {
29 	BOOT_TRIPLE	= 't',
30 	BOOT_KBD	= 'k',
31 	BOOT_BIOS	= 'b',
32 	BOOT_ACPI	= 'a',
33 	BOOT_EFI	= 'e',
34 	BOOT_CF9_FORCE	= 'p',
35 	BOOT_CF9_SAFE	= 'q',
36 };
37 extern enum reboot_type reboot_type;
38 
39 extern int reboot_default;
40 extern int reboot_cpu;
41 extern int reboot_force;
42 
43 
44 extern int register_reboot_notifier(struct notifier_block *);
45 extern int unregister_reboot_notifier(struct notifier_block *);
46 
47 extern int devm_register_reboot_notifier(struct device *, struct notifier_block *);
48 
49 extern int register_restart_handler(struct notifier_block *);
50 extern int unregister_restart_handler(struct notifier_block *);
51 extern void do_kernel_restart(char *cmd);
52 
53 /*
54  * Architecture-specific implementations of sys_reboot commands.
55  */
56 
57 extern void migrate_to_reboot_cpu(void);
58 extern void machine_restart(char *cmd);
59 extern void machine_halt(void);
60 extern void machine_power_off(void);
61 
62 extern void machine_shutdown(void);
63 struct pt_regs;
64 extern void machine_crash_shutdown(struct pt_regs *);
65 
66 void do_kernel_power_off(void);
67 
68 /*
69  * sys-off handler API.
70  */
71 
72 /*
73  * Standard sys-off priority levels. Users are expected to set priorities
74  * relative to the standard levels.
75  *
76  * SYS_OFF_PRIO_PLATFORM:	Use this for platform-level handlers.
77  *
78  * SYS_OFF_PRIO_LOW:		Use this for handler of last resort.
79  *
80  * SYS_OFF_PRIO_DEFAULT:	Use this for normal handlers.
81  *
82  * SYS_OFF_PRIO_HIGH:		Use this for higher priority handlers.
83  *
84  * SYS_OFF_PRIO_FIRMWARE:	Use this if handler uses firmware call.
85  */
86 #define SYS_OFF_PRIO_PLATFORM		-256
87 #define SYS_OFF_PRIO_LOW		-128
88 #define SYS_OFF_PRIO_DEFAULT		0
89 #define SYS_OFF_PRIO_HIGH		192
90 #define SYS_OFF_PRIO_FIRMWARE		224
91 
92 enum sys_off_mode {
93 	/**
94 	 * @SYS_OFF_MODE_POWER_OFF_PREPARE:
95 	 *
96 	 * Handlers prepare system to be powered off. Handlers are
97 	 * allowed to sleep.
98 	 */
99 	SYS_OFF_MODE_POWER_OFF_PREPARE,
100 
101 	/**
102 	 * @SYS_OFF_MODE_POWER_OFF:
103 	 *
104 	 * Handlers power-off system. Handlers are disallowed to sleep.
105 	 */
106 	SYS_OFF_MODE_POWER_OFF,
107 
108 	/**
109 	 * @SYS_OFF_MODE_RESTART_PREPARE:
110 	 *
111 	 * Handlers prepare system to be restarted. Handlers are
112 	 * allowed to sleep.
113 	 */
114 	SYS_OFF_MODE_RESTART_PREPARE,
115 
116 	/**
117 	 * @SYS_OFF_MODE_RESTART:
118 	 *
119 	 * Handlers restart system. Handlers are disallowed to sleep.
120 	 */
121 	SYS_OFF_MODE_RESTART,
122 };
123 
124 /**
125  * struct sys_off_data - sys-off callback argument
126  *
127  * @mode: Mode ID. Currently used only by the sys-off restart mode,
128  *        see enum reboot_mode for the available modes.
129  * @cb_data: User's callback data.
130  * @cmd: Command string. Currently used only by the sys-off restart mode,
131  *       NULL otherwise.
132  */
133 struct sys_off_data {
134 	int mode;
135 	void *cb_data;
136 	const char *cmd;
137 };
138 
139 struct sys_off_handler *
140 register_sys_off_handler(enum sys_off_mode mode,
141 			 int priority,
142 			 int (*callback)(struct sys_off_data *data),
143 			 void *cb_data);
144 void unregister_sys_off_handler(struct sys_off_handler *handler);
145 
146 int devm_register_sys_off_handler(struct device *dev,
147 				  enum sys_off_mode mode,
148 				  int priority,
149 				  int (*callback)(struct sys_off_data *data),
150 				  void *cb_data);
151 
152 int devm_register_power_off_handler(struct device *dev,
153 				    int (*callback)(struct sys_off_data *data),
154 				    void *cb_data);
155 
156 int devm_register_restart_handler(struct device *dev,
157 				  int (*callback)(struct sys_off_data *data),
158 				  void *cb_data);
159 
160 int register_platform_power_off(void (*power_off)(void));
161 void unregister_platform_power_off(void (*power_off)(void));
162 
163 /*
164  * Architecture independent implemenations of sys_reboot commands.
165  */
166 
167 extern void kernel_restart_prepare(char *cmd);
168 extern void kernel_restart(char *cmd);
169 extern void kernel_halt(void);
170 extern void kernel_power_off(void);
171 extern bool kernel_can_power_off(void);
172 
173 void ctrl_alt_del(void);
174 
175 extern void orderly_poweroff(bool force);
176 extern void orderly_reboot(void);
177 void hw_protection_shutdown(const char *reason, int ms_until_forced);
178 
179 /*
180  * Emergency restart, callable from an interrupt handler.
181  */
182 
183 extern void emergency_restart(void);
184 #include <asm/emergency-restart.h>
185 
186 #endif /* _LINUX_REBOOT_H */
187