arch/um/kernel/reboot.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   4  */
   5
   6 #include <linux/sched/signal.h>
   7 #include <linux/sched/task.h>
   8 #include <linux/sched/mm.h>
   9 #include <linux/spinlock.h>
  10 #include <linux/slab.h>
  11 #include <linux/oom.h>
  12 #include <linux/reboot.h>
  13 #include <kern_util.h>
  14 #include <os.h>
  15 #include <skas.h>
  16
  17 void (*pm_power_off)(void);
  18 EXPORT_SYMBOL(pm_power_off);
  19
  20 static void kill_off_processes(void)
  21 {
  22         struct task_struct *p;
  23         int pid;
  24
  25         read_lock(&tasklist_lock);
  26         for_each_process(p) {
  27                 struct task_struct *t;
  28
  29                 t = find_lock_task_mm(p);
  30                 if (!t)
  31                         continue;
  32                 pid = t->mm->context.id.pid;
  33                 task_unlock(t);
  34                 os_kill_ptraced_process(pid, 1);
  35         }
  36         read_unlock(&tasklist_lock);
  37 }
  38
  39 void uml_cleanup(void)
  40 {
  41         kmalloc_ok = 0;
  42         do_uml_exitcalls();
  43         kill_off_processes();
  44 }
  45
  46 void machine_restart(char * __unused)
  47 {
  48         uml_cleanup();
  49         reboot_skas();
  50 }
  51
  52 void machine_power_off(void)
  53 {
  54         uml_cleanup();
  55         halt_skas();
  56 }
  57
  58 void machine_halt(void)
  59 {
  60         machine_power_off();
  61 }
  62
  63 static int sys_power_off_handler(struct sys_off_data *data)
  64 {
  65         machine_power_off();
  66         return 0;
  67 }
  68
  69 static int register_power_off(void)
  70 {
  71         register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
  72                                  SYS_OFF_PRIO_DEFAULT,
  73                                  sys_power_off_handler, NULL);
  74         return 0;
  75 }
  76 __initcall(register_power_off);