arch/parisc/kernel/init_task.c

   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
  37 static struct fs_struct init_fs = INIT_FS;
  38 static struct files_struct init_files = INIT_FILES;
  39 static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
  40 static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
  41 struct mm_struct init_mm = INIT_MM(init_mm);
  42
  43 EXPORT_SYMBOL(init_mm);
  44
  45 /*
  46  * Initial task structure.
  47  *
  48  * We need to make sure that this is 16384-byte aligned due to the
  49  * way process stacks are handled. This is done by having a special
  50  * "init_task" linker map entry..
  51  */
  52 union thread_union init_thread_union
  53         __attribute__((aligned(128))) __attribute__((__section__(".data.init_task"))) =
  54                 { INIT_THREAD_INFO(init_task) };
  55
  56 #if PT_NLEVELS == 3
  57 /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
  58  * with the first pmd adjacent to the pgd and below it. gcc doesn't actually
  59  * guarantee that global objects will be laid out in memory in the same order
  60  * as the order of declaration, so put these in different sections and use
  61  * the linker script to order them. */
  62 pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data.vm0.pmd"), aligned(PAGE_SIZE)));
  63 #endif
  64
  65 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data.vm0.pgd"), aligned(PAGE_SIZE)));
  66 pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data.vm0.pte"), aligned(PAGE_SIZE)));
  67
  68 /*
  69  * Initial task structure.
  70  *
  71  * All other task structs will be allocated on slabs in fork.c
  72  */
  73 EXPORT_SYMBOL(init_task);
  74
  75 __asm__(".data");
  76 struct task_struct init_task = INIT_TASK(init_task);