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 <as-layout.h>
   9 #include <kern.h>
  10 #include <os.h>
  11 #include <skas.h>
  12
  13 extern void start_kernel(void);
  14
  15 static int __init start_kernel_proc(void *unused)
  16 {
  17         int pid;
  18
  19         block_signals();
  20         pid = os_getpid();
  21
  22         cpu_tasks[0].pid = pid;
  23         cpu_tasks[0].task = current;
  24
  25         start_kernel();
  26         return 0;
  27 }
  28
  29 extern int userspace_pid[];
  30
  31 extern char cpu0_irqstack[];
  32
  33 int __init start_uml(void)
  34 {
  35         stack_protections((unsigned long) &cpu0_irqstack);
  36         set_sigstack(cpu0_irqstack, THREAD_SIZE);
  37
  38         init_new_thread_signals();
  39
  40         init_task.thread.request.u.thread.proc = start_kernel_proc;
  41         init_task.thread.request.u.thread.arg = NULL;
  42         return start_idle_thread(task_stack_page(&init_task),
  43                                  &init_task.thread.switch_buf);
  44 }
  45
  46 unsigned long current_stub_stack(void)
  47 {
  48         if (current->mm == NULL)
  49                 return 0;
  50
  51         return current->mm->context.id.stack;
  52 }