1 // SPDX-License-Identifier: GPL-2.0
2 /* reboot.c: reboot/shutdown/halt/poweroff handling
3  *
4  * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
5  */
6 #include <linux/kernel.h>
7 #include <linux/reboot.h>
8 #include <linux/export.h>
9 #include <linux/pm.h>
10 
11 #include <asm/oplib.h>
12 #include <asm/prom.h>
13 #include <asm/setup.h>
14 
15 /* sysctl - toggle power-off restriction for serial console
16  * systems in machine_power_off()
17  */
18 int scons_pwroff = 1;
19 
20 /* This isn't actually used, it exists merely to satisfy the
21  * reference in kernel/sys.c
22  */
23 void (*pm_power_off)(void) = machine_power_off;
24 EXPORT_SYMBOL(pm_power_off);
25 
machine_power_off(void)26 void machine_power_off(void)
27 {
28 	if (strcmp(of_console_device->type, "serial") || scons_pwroff)
29 		prom_halt_power_off();
30 
31 	prom_halt();
32 }
33 
machine_halt(void)34 void machine_halt(void)
35 {
36 	prom_halt();
37 	panic("Halt failed!");
38 }
39 
machine_restart(char * cmd)40 void machine_restart(char *cmd)
41 {
42 	char *p;
43 
44 	p = strchr(reboot_command, '\n');
45 	if (p)
46 		*p = 0;
47 	if (cmd)
48 		prom_reboot(cmd);
49 	if (*reboot_command)
50 		prom_reboot(reboot_command);
51 	prom_reboot("");
52 	panic("Reboot failed!");
53 }
54 
55