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
  15 void pgd_init(unsigned long page)
  16 {
  17         unsigned long *p, *end;
  18
  19         p = (unsigned long *) page;
  20         end = p + PTRS_PER_PGD;
  21
  22         while (p < end) {
  23                 p[0] = (unsigned long) invalid_pmd_table;
  24                 p[1] = (unsigned long) invalid_pmd_table;
  25                 p[2] = (unsigned long) invalid_pmd_table;
  26                 p[3] = (unsigned long) invalid_pmd_table;
  27                 p[4] = (unsigned long) invalid_pmd_table;
  28                 p[5] = (unsigned long) invalid_pmd_table;
  29                 p[6] = (unsigned long) invalid_pmd_table;
  30                 p[7] = (unsigned long) invalid_pmd_table;
  31                 p += 8;
  32         }
  33 }
  34
  35 void pmd_init(unsigned long addr, unsigned long pagetable)
  36 {
  37         unsigned long *p, *end;
  38
  39         p = (unsigned long *) addr;
  40         end = p + PTRS_PER_PMD;
  41
  42         while (p < end) {
  43                 p[0] = (unsigned long)pagetable;
  44                 p[1] = (unsigned long)pagetable;
  45                 p[2] = (unsigned long)pagetable;
  46                 p[3] = (unsigned long)pagetable;
  47                 p[4] = (unsigned long)pagetable;
  48                 p[5] = (unsigned long)pagetable;
  49                 p[6] = (unsigned long)pagetable;
  50                 p[7] = (unsigned long)pagetable;
  51                 p += 8;
  52         }
  53 }
  54
  55 void __init pagetable_init(void)
  56 {
  57         unsigned long vaddr;
  58         pgd_t *pgd_base;
  59
  60         /* Initialize the entire pgd.  */
  61         pgd_init((unsigned long)swapper_pg_dir);
  62 #ifdef MODULE_START
  63         pgd_init((unsigned long)module_pg_dir);
  64 #endif
  65         pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
  66
  67         pgd_base = swapper_pg_dir;
  68         /*
  69          * Fixed mappings:
  70          */
  71         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
  72         fixrange_init(vaddr, 0, pgd_base);
  73 }