arch/mips/mm/pgtable-32.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) 2003 by Ralf Baechle
   7  */
   8 #include <linux/init.h>
   9 #include <linux/mm.h>
  10 #include <linux/bootmem.h>
  11 #include <linux/highmem.h>
  12 #include <asm/fixmap.h>
  13 #include <asm/pgtable.h>
  14
  15 void pgd_init(unsigned long page)
  16 {
  17         unsigned long *p = (unsigned long *) page;
  18         int i;
  19
  20         for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
  21                 p[i + 0] = (unsigned long) invalid_pte_table;
  22                 p[i + 1] = (unsigned long) invalid_pte_table;
  23                 p[i + 2] = (unsigned long) invalid_pte_table;
  24                 p[i + 3] = (unsigned long) invalid_pte_table;
  25                 p[i + 4] = (unsigned long) invalid_pte_table;
  26                 p[i + 5] = (unsigned long) invalid_pte_table;
  27                 p[i + 6] = (unsigned long) invalid_pte_table;
  28                 p[i + 7] = (unsigned long) invalid_pte_table;
  29         }
  30 }
  31
  32 void __init pagetable_init(void)
  33 {
  34 #ifdef CONFIG_HIGHMEM
  35         unsigned long vaddr;
  36         pgd_t *pgd, *pgd_base;
  37         pud_t *pud;
  38         pmd_t *pmd;
  39         pte_t *pte;
  40 #endif
  41
  42         /* Initialize the entire pgd.  */
  43         pgd_init((unsigned long)swapper_pg_dir);
  44         pgd_init((unsigned long)swapper_pg_dir
  45                  + sizeof(pgd_t) * USER_PTRS_PER_PGD);
  46
  47 #ifdef CONFIG_HIGHMEM
  48         pgd_base = swapper_pg_dir;
  49
  50         /*
  51          * Fixed mappings:
  52          */
  53         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
  54         fixrange_init(vaddr, 0, pgd_base);
  55
  56         /*
  57          * Permanent kmaps:
  58          */
  59         vaddr = PKMAP_BASE;
  60         fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
  61
  62         pgd = swapper_pg_dir + __pgd_offset(vaddr);
  63         pud = pud_offset(pgd, vaddr);
  64         pmd = pmd_offset(pud, vaddr);
  65         pte = pte_offset_kernel(pmd, vaddr);
  66         pkmap_page_table = pte;
  67 #endif
  68 }