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/export.h>
  10 #include <linux/init.h>
  11 #include <linux/mm.h>
  12 #include <asm/fixmap.h>
  13 #include <asm/pgalloc.h>
  14 #include <asm/tlbflush.h>
  15
  16 void pgd_init(void *addr)
  17 {
  18         unsigned long *p, *end;
  19         unsigned long entry;
  20
  21 #if !defined(__PAGETABLE_PUD_FOLDED)
  22         entry = (unsigned long)invalid_pud_table;
  23 #elif !defined(__PAGETABLE_PMD_FOLDED)
  24         entry = (unsigned long)invalid_pmd_table;
  25 #else
  26         entry = (unsigned long)invalid_pte_table;
  27 #endif
  28
  29         p = (unsigned long *) addr;
  30         end = p + PTRS_PER_PGD;
  31
  32         do {
  33                 p[0] = entry;
  34                 p[1] = entry;
  35                 p[2] = entry;
  36                 p[3] = entry;
  37                 p[4] = entry;
  38                 p += 8;
  39                 p[-3] = entry;
  40                 p[-2] = entry;
  41                 p[-1] = entry;
  42         } while (p != end);
  43 }
  44
  45 #ifndef __PAGETABLE_PMD_FOLDED
  46 void pmd_init(void *addr)
  47 {
  48         unsigned long *p, *end;
  49         unsigned long pagetable = (unsigned long)invalid_pte_table;
  50
  51         p = (unsigned long *)addr;
  52         end = p + PTRS_PER_PMD;
  53
  54         do {
  55                 p[0] = pagetable;
  56                 p[1] = pagetable;
  57                 p[2] = pagetable;
  58                 p[3] = pagetable;
  59                 p[4] = pagetable;
  60                 p += 8;
  61                 p[-3] = pagetable;
  62                 p[-2] = pagetable;
  63                 p[-1] = pagetable;
  64         } while (p != end);
  65 }
  66 EXPORT_SYMBOL_GPL(pmd_init);
  67 #endif
  68
  69 #ifndef __PAGETABLE_PUD_FOLDED
  70 void pud_init(void *addr)
  71 {
  72         unsigned long *p, *end;
  73         unsigned long pagetable = (unsigned long)invalid_pmd_table;
  74
  75         p = (unsigned long *)addr;
  76         end = p + PTRS_PER_PUD;
  77
  78         do {
  79                 p[0] = pagetable;
  80                 p[1] = pagetable;
  81                 p[2] = pagetable;
  82                 p[3] = pagetable;
  83                 p[4] = pagetable;
  84                 p += 8;
  85                 p[-3] = pagetable;
  86                 p[-2] = pagetable;
  87                 p[-1] = pagetable;
  88         } while (p != end);
  89 }
  90 #endif
  91
  92 pmd_t mk_pmd(struct page *page, pgprot_t prot)
  93 {
  94         pmd_t pmd;
  95
  96         pmd_val(pmd) = (page_to_pfn(page) << PFN_PTE_SHIFT) | pgprot_val(prot);
  97
  98         return pmd;
  99 }
 100
 101 void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 102                 pmd_t *pmdp, pmd_t pmd)
 103 {
 104         *pmdp = pmd;
 105 }
 106
 107 void __init pagetable_init(void)
 108 {
 109         unsigned long vaddr;
 110         pgd_t *pgd_base;
 111
 112         /* Initialize the entire pgd.  */
 113         pgd_init(swapper_pg_dir);
 114 #ifndef __PAGETABLE_PUD_FOLDED
 115         pud_init(invalid_pud_table);
 116 #endif
 117 #ifndef __PAGETABLE_PMD_FOLDED
 118         pmd_init(invalid_pmd_table);
 119 #endif
 120         pgd_base = swapper_pg_dir;
 121         /*
 122          * Fixed mappings:
 123          */
 124         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 125         fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
 126 }