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 #include <asm/pgalloc.h>
  15
  16 void 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
  33 void __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) & PMD_MASK;
  55         fixrange_init(vaddr, 0, pgd_base);
  56
  57 #ifdef CONFIG_HIGHMEM
  58         /*
  59          * Permanent kmaps:
  60          */
  61         vaddr = PKMAP_BASE;
  62         fixrange_init(vaddr, 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 }