arch/tile/kernel/init_task.c

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #include <linux/mm.h>
  16 #include <linux/fs.h>
  17 #include <linux/init_task.h>
  18 #include <linux/mqueue.h>
  19 #include <linux/module.h>
  20 #include <linux/start_kernel.h>
  21 #include <linux/uaccess.h>
  22
  23 static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
  24 static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
  25
  26 /*
  27  * Initial thread structure.
  28  *
  29  * We need to make sure that this is THREAD_SIZE aligned due to the
  30  * way process stacks are handled. This is done by having a special
  31  * "init_task" linker map entry..
  32  */
  33 union thread_union init_thread_union __init_task_data = {
  34         INIT_THREAD_INFO(init_task)
  35 };
  36
  37 /*
  38  * Initial task structure.
  39  *
  40  * All other task structs will be allocated on slabs in fork.c
  41  */
  42 struct task_struct init_task = INIT_TASK(init_task);
  43 EXPORT_SYMBOL(init_task);
  44
  45 /*
  46  * per-CPU stack and boot info.
  47  */
  48 DEFINE_PER_CPU(unsigned long, boot_sp) =
  49         (unsigned long)init_stack + THREAD_SIZE;
  50
  51 #ifdef CONFIG_SMP
  52 DEFINE_PER_CPU(unsigned long, boot_pc) = (unsigned long)start_kernel;
  53 #else
  54 /*
  55  * The variable must be __initdata since it references __init code.
  56  * With CONFIG_SMP it is per-cpu data, which is exempt from validation.
  57  */
  58 unsigned long __initdata boot_pc = (unsigned long)start_kernel;
  59 #endif