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/pgalloc.h>
  14 #include <asm/tlbflush.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 #if defined(CONFIG_TRANSPARENT_HUGEPAGE)
  34 pmd_t mk_pmd(struct page *page, pgprot_t prot)
  35 {
  36         pmd_t pmd;
  37
  38         pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
  39
  40         return pmd;
  41 }
  42
  43
  44 void set_pmd_at(struct mm_struct *mm, unsigned long addr,
  45                 pmd_t *pmdp, pmd_t pmd)
  46 {
  47         *pmdp = pmd;
  48 }
  49 #endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
  50
  51 void __init pagetable_init(void)
  52 {
  53         unsigned long vaddr;
  54         pgd_t *pgd_base;
  55 #ifdef CONFIG_HIGHMEM
  56         pgd_t *pgd;
  57         p4d_t *p4d;
  58         pud_t *pud;
  59         pmd_t *pmd;
  60         pte_t *pte;
  61 #endif
  62
  63         /* Initialize the entire pgd.  */
  64         pgd_init((unsigned long)swapper_pg_dir);
  65         pgd_init((unsigned long)swapper_pg_dir
  66                  + sizeof(pgd_t) * USER_PTRS_PER_PGD);
  67
  68         pgd_base = swapper_pg_dir;
  69
  70         /*
  71          * Fixed mappings:
  72          */
  73         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
  74         fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
  75
  76 #ifdef CONFIG_HIGHMEM
  77         /*
  78          * Permanent kmaps:
  79          */
  80         vaddr = PKMAP_BASE;
  81         fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
  82
  83         pgd = swapper_pg_dir + pgd_index(vaddr);
  84         p4d = p4d_offset(pgd, vaddr);
  85         pud = pud_offset(p4d, vaddr);
  86         pmd = pmd_offset(pud, vaddr);
  87         pte = pte_offset_kernel(pmd, vaddr);
  88         pkmap_page_table = pte;
  89 #endif
  90 }