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 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 34 void machine_halt(void) 35 { 36 prom_halt(); 37 panic("Halt failed!"); 38 } 39 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