LXR linux/arch/mips/mm/pgtable-64.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1999, 2000 by Silicon Graphics
   7 * Copyright (C) 2003 by Ralf Baechle
   8 */
   9#include <linux/init.h>
  10#include <linux/mm.h>
  11#include <asm/fixmap.h>
  12#include <asm/pgtable.h>
  13#include <asm/pgalloc.h>
  14
  15void pgd_init(unsigned long page)
  16{
  17        unsigned long *p, *end;
  18        unsigned long entry;
  19
  20#ifdef __PAGETABLE_PMD_FOLDED
  21        entry = (unsigned long)invalid_pte_table;
  22#else
  23        entry = (unsigned long)invalid_pmd_table;
  24#endif
  25
  26        p = (unsigned long *) page;
  27        end = p + PTRS_PER_PGD;
  28
  29        while (p < end) {
  30                p[0] = entry;
  31                p[1] = entry;
  32                p[2] = entry;
  33                p[3] = entry;
  34                p[4] = entry;
  35                p[5] = entry;
  36                p[6] = entry;
  37                p[7] = entry;
  38                p += 8;
  39        }
  40}
  41
  42#ifndef __PAGETABLE_PMD_FOLDED
  43void pmd_init(unsigned long addr, unsigned long pagetable)
  44{
  45        unsigned long *p, *end;
  46
  47        p = (unsigned long *) addr;
  48        end = p + PTRS_PER_PMD;
  49
  50        while (p < end) {
  51                p[0] = pagetable;
  52                p[1] = pagetable;
  53                p[2] = pagetable;
  54                p[3] = pagetable;
  55                p[4] = pagetable;
  56                p[5] = pagetable;
  57                p[6] = pagetable;
  58                p[7] = pagetable;
  59                p += 8;
  60        }
  61}
  62#endif
  63
  64void __init pagetable_init(void)
  65{
  66        unsigned long vaddr;
  67        pgd_t *pgd_base;
  68
  69        /* Initialize the entire pgd.  */
  70        pgd_init((unsigned long)swapper_pg_dir);
  71#ifndef __PAGETABLE_PMD_FOLDED
  72        pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
  73#endif
  74        pgd_base = swapper_pg_dir;
  75        /*
  76         * Fixed mappings:
  77         */
  78        vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
  79        fixrange_init(vaddr, 0, pgd_base);
  80}
  81