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         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         do {
  30                 p[0] = entry;
  31                 p[1] = entry;
  32                 p[2] = entry;
  33                 p[3] = entry;
  34                 p[4] = entry;
  35                 p += 8;
  36                 p[-3] = entry;
  37                 p[-2] = entry;
  38                 p[-1] = entry;
  39         } while (p != end);
  40 }
  41
  42 #ifndef __PAGETABLE_PMD_FOLDED
  43 void 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         do {
  51                 p[0] = pagetable;
  52                 p[1] = pagetable;
  53                 p[2] = pagetable;
  54                 p[3] = pagetable;
  55                 p[4] = pagetable;
  56                 p += 8;
  57                 p[-3] = pagetable;
  58                 p[-2] = pagetable;
  59                 p[-1] = pagetable;
  60         } while (p != end);
  61 }
  62 #endif
  63
  64 void __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, vaddr + FIXADDR_SIZE, pgd_base);
  80 }