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/pgtable.h>
  12
  13 void pgd_init(unsigned long page)
  14 {
  15         unsigned long *p, *end;
  16
  17         p = (unsigned long *) page;
  18         end = p + PTRS_PER_PGD;
  19
  20         while (p < end) {
  21                 p[0] = (unsigned long) invalid_pmd_table;
  22                 p[1] = (unsigned long) invalid_pmd_table;
  23                 p[2] = (unsigned long) invalid_pmd_table;
  24                 p[3] = (unsigned long) invalid_pmd_table;
  25                 p[4] = (unsigned long) invalid_pmd_table;
  26                 p[5] = (unsigned long) invalid_pmd_table;
  27                 p[6] = (unsigned long) invalid_pmd_table;
  28                 p[7] = (unsigned long) invalid_pmd_table;
  29                 p += 8;
  30         }
  31 }
  32
  33 void pmd_init(unsigned long addr, unsigned long pagetable)
  34 {
  35         unsigned long *p, *end;
  36
  37         p = (unsigned long *) addr;
  38         end = p + PTRS_PER_PMD;
  39
  40         while (p < end) {
  41                 p[0] = (unsigned long)pagetable;
  42                 p[1] = (unsigned long)pagetable;
  43                 p[2] = (unsigned long)pagetable;
  44                 p[3] = (unsigned long)pagetable;
  45                 p[4] = (unsigned long)pagetable;
  46                 p[5] = (unsigned long)pagetable;
  47                 p[6] = (unsigned long)pagetable;
  48                 p[7] = (unsigned long)pagetable;
  49                 p += 8;
  50         }
  51 }
  52
  53 void __init pagetable_init(void)
  54 {
  55         pmd_t *pmd;
  56         pte_t *pte;
  57         int i;
  58
  59         /* Initialize the entire pgd.  */
  60         pgd_init((unsigned long)swapper_pg_dir);
  61         pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
  62         memset((void *)invalid_pte_table, 0, sizeof(pte_t) * PTRS_PER_PTE);
  63
  64         memset((void *)kptbl, 0, PAGE_SIZE << PGD_ORDER);
  65         memset((void *)kpmdtbl, 0, PAGE_SIZE);
  66         set_pgd(swapper_pg_dir, __pgd((unsigned long)kpmdtbl));
  67
  68         /*
  69          * The 64-bit kernel uses a flat pagetable for it's kernel mappings ...
  70          */
  71         pmd = kpmdtbl;
  72         pte = kptbl;
  73         i = 0;
  74         while (i < (1 << PGD_ORDER)) {
  75                 pmd_val(*pmd) = (unsigned long)pte;
  76                 pte += PTRS_PER_PTE;
  77                 pmd++;
  78                 i++;
  79         }
  80 }