linux/arch/parisc/kernel/init_task.c
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   1/* 
   2 *    Static declaration of "init" task data structure.
   3 *
   4 *    Copyright (C) 2000 Paul Bame <bame at parisc-linux.org>
   5 *    Copyright (C) 2000-2001 John Marvin <jsm at parisc-linux.org>
   6 *    Copyright (C) 2001 Helge Deller <deller @ parisc-linux.org>
   7 *    Copyright (C) 2002 Matthew Wilcox <willy with parisc-linux.org>
   8 *
   9 *
  10 *    This program is free software; you can redistribute it and/or modify
  11 *    it under the terms of the GNU General Public License as published by
  12 *    the Free Software Foundation; either version 2 of the License, or
  13 *    (at your option) any later version.
  14 *
  15 *    This program is distributed in the hope that it will be useful,
  16 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 *    GNU General Public License for more details.
  19 *
  20 *    You should have received a copy of the GNU General Public License
  21 *    along with this program; if not, write to the Free Software
  22 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 */
  24
  25#include <linux/mm.h>
  26#include <linux/fs.h>
  27#include <linux/module.h>
  28#include <linux/sched.h>
  29#include <linux/init.h>
  30#include <linux/init_task.h>
  31#include <linux/mqueue.h>
  32
  33#include <asm/uaccess.h>
  34#include <asm/pgtable.h>
  35#include <asm/pgalloc.h>
  36
  37static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
  38static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
  39/*
  40 * Initial task structure.
  41 *
  42 * We need to make sure that this is 16384-byte aligned due to the
  43 * way process stacks are handled. This is done by having a special
  44 * "init_task" linker map entry..
  45 */
  46union thread_union init_thread_union __init_task_data
  47        __attribute__((aligned(128))) =
  48                { INIT_THREAD_INFO(init_task) };
  49
  50#if PT_NLEVELS == 3
  51/* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
  52 * with the first pmd adjacent to the pgd and below it. gcc doesn't actually
  53 * guarantee that global objects will be laid out in memory in the same order 
  54 * as the order of declaration, so put these in different sections and use
  55 * the linker script to order them. */
  56pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
  57#endif
  58
  59pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
  60pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
  61
  62/*
  63 * Initial task structure.
  64 *
  65 * All other task structs will be allocated on slabs in fork.c
  66 */
  67EXPORT_SYMBOL(init_task);
  68
  69__asm__(".data");
  70struct task_struct init_task = INIT_TASK(init_task);
  71