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 #include <linux/of.h> 11 12 #include <asm/oplib.h> 13 #include <asm/prom.h> 14 #include <asm/setup.h> 15 16 /* sysctl - toggle power-off restriction for serial console 17 * systems in machine_power_off() 18 */ 19 int scons_pwroff = 1; 20 21 /* This isn't actually used, it exists merely to satisfy the 22 * reference in kernel/sys.c 23 */ 24 void (*pm_power_off)(void) = machine_power_off; 25 EXPORT_SYMBOL(pm_power_off); 26 27 void machine_power_off(void) 28 { 29 if (!of_node_is_type(of_console_device, "serial") || scons_pwroff) 30 prom_halt_power_off(); 31 32 prom_halt(); 33 } 34 35 void machine_halt(void) 36 { 37 prom_halt(); 38 panic("Halt failed!"); 39 } 40 41 void machine_restart(char *cmd) 42 { 43 char *p; 44 45 p = strchr(reboot_command, '\n'); 46 if (p) 47 *p = 0; 48 if (cmd) 49 prom_reboot(cmd); 50 if (*reboot_command) 51 prom_reboot(reboot_command); 52 prom_reboot(""); 53 panic("Reboot failed!"); 54 } 55 56