LXR linux/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/memblock.h>
  11#include <linux/highmem.h>
  12#include <asm/fixmap.h>
  13#include <asm/pgtable.h>
  14#include <asm/pgalloc.h>
  15
  16void pgd_init(unsigned long page)
  17{
  18        unsigned long *p = (unsigned long *) page;
  19        int i;
  20
  21        for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
  22                p[i + 0] = (unsigned long) invalid_pte_table;
  23                p[i + 1] = (unsigned long) invalid_pte_table;
  24                p[i + 2] = (unsigned long) invalid_pte_table;
  25                p[i + 3] = (unsigned long) invalid_pte_table;
  26                p[i + 4] = (unsigned long) invalid_pte_table;
  27                p[i + 5] = (unsigned long) invalid_pte_table;
  28                p[i + 6] = (unsigned long) invalid_pte_table;
  29                p[i + 7] = (unsigned long) invalid_pte_table;
  30        }
  31}
  32
  33void __init pagetable_init(void)
  34{
  35        unsigned long vaddr;
  36        pgd_t *pgd_base;
  37#ifdef CONFIG_HIGHMEM
  38        pgd_t *pgd;
  39        pud_t *pud;
  40        pmd_t *pmd;
  41        pte_t *pte;
  42#endif
  43
  44        /* Initialize the entire pgd.  */
  45        pgd_init((unsigned long)swapper_pg_dir);
  46        pgd_init((unsigned long)swapper_pg_dir
  47                 + sizeof(pgd_t) * USER_PTRS_PER_PGD);
  48
  49        pgd_base = swapper_pg_dir;
  50
  51        /*
  52         * Fixed mappings:
  53         */
  54        vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
  55        fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
  56
  57#ifdef CONFIG_HIGHMEM
  58        /*
  59         * Permanent kmaps:
  60         */
  61        vaddr = PKMAP_BASE;
  62        fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
  63
  64        pgd = swapper_pg_dir + __pgd_offset(vaddr);
  65        pud = pud_offset(pgd, vaddr);
  66        pmd = pmd_offset(pud, vaddr);
  67        pte = pte_offset_kernel(pmd, vaddr);
  68        pkmap_page_table = pte;
  69#endif
  70}
  71