arch/um/kernel/skas/process.c

   1 /*
   2  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <linux/init.h>
   7 #include <linux/sched.h>
   8 #include <linux/sched/task_stack.h>
   9 #include <as-layout.h>
  10 #include <kern.h>
  11 #include <os.h>
  12 #include <skas.h>
  13
  14 extern void start_kernel(void);
  15
  16 static int __init start_kernel_proc(void *unused)
  17 {
  18         int pid;
  19
  20         block_signals();
  21         pid = os_getpid();
  22
  23         cpu_tasks[0].pid = pid;
  24         cpu_tasks[0].task = current;
  25
  26         start_kernel();
  27         return 0;
  28 }
  29
  30 extern int userspace_pid[];
  31
  32 extern char cpu0_irqstack[];
  33
  34 int __init start_uml(void)
  35 {
  36         stack_protections((unsigned long) &cpu0_irqstack);
  37         set_sigstack(cpu0_irqstack, THREAD_SIZE);
  38
  39         init_new_thread_signals();
  40
  41         init_task.thread.request.u.thread.proc = start_kernel_proc;
  42         init_task.thread.request.u.thread.arg = NULL;
  43         return start_idle_thread(task_stack_page(&init_task),
  44                                  &init_task.thread.switch_buf);
  45 }
  46
  47 unsigned long current_stub_stack(void)
  48 {
  49         if (current->mm == NULL)
  50                 return 0;
  51
  52         return current->mm->context.id.stack;
  53 }