arch/score/mm/pgtable.c

   1 /*
   2  * arch/score/mm/pgtable-32.c
   3  *
   4  * Score Processor version.
   5  *
   6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   7  *  Lennox Wu <lennox.wu@sunplusct.com>
   8  *  Chen Liqin <liqin.chen@sunplusct.com>
   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, see the file COPYING, or write
  22  * to the Free Software Foundation, Inc.,
  23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  */
  25
  26 #include <linux/bootmem.h>
  27 #include <linux/init.h>
  28 #include <linux/pfn.h>
  29 #include <linux/mm.h>
  30
  31 void pgd_init(unsigned long page)
  32 {
  33         unsigned long *p = (unsigned long *) page;
  34         int i;
  35
  36         for (i = 0; i < USER_PTRS_PER_PGD; i += 8) {
  37                 p[i + 0] = (unsigned long) invalid_pte_table;
  38                 p[i + 1] = (unsigned long) invalid_pte_table;
  39                 p[i + 2] = (unsigned long) invalid_pte_table;
  40                 p[i + 3] = (unsigned long) invalid_pte_table;
  41                 p[i + 4] = (unsigned long) invalid_pte_table;
  42                 p[i + 5] = (unsigned long) invalid_pte_table;
  43                 p[i + 6] = (unsigned long) invalid_pte_table;
  44                 p[i + 7] = (unsigned long) invalid_pte_table;
  45         }
  46 }
  47
  48 void __init pagetable_init(void)
  49 {
  50         unsigned long vaddr;
  51         pgd_t *pgd_base;
  52
  53         /* Initialize the entire pgd. */
  54         pgd_init((unsigned long) swapper_pg_dir);
  55         pgd_init((unsigned long) swapper_pg_dir
  56                 + sizeof(pgd_t) * USER_PTRS_PER_PGD);
  57
  58         pgd_base = swapper_pg_dir;
  59         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
  60 }