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/pgtable.h>
  14 #include <asm/pgalloc.h>
  15 #include <asm/tlbflush.h>
  16
  17 void pgd_init(unsigned long page)
  18 {
  19         unsigned long *p, *end;
  20         unsigned long entry;
  21
  22 #ifdef __PAGETABLE_PMD_FOLDED
  23         entry = (unsigned long)invalid_pte_table;
  24 #else
  25         entry = (unsigned long)invalid_pmd_table;
  26 #endif
  27
  28         p = (unsigned long *) page;
  29         end = p + PTRS_PER_PGD;
  30
  31         do {
  32                 p[0] = entry;
  33                 p[1] = entry;
  34                 p[2] = entry;
  35                 p[3] = entry;
  36                 p[4] = entry;
  37                 p += 8;
  38                 p[-3] = entry;
  39                 p[-2] = entry;
  40                 p[-1] = entry;
  41         } while (p != end);
  42 }
  43
  44 #ifndef __PAGETABLE_PMD_FOLDED
  45 void pmd_init(unsigned long addr, unsigned long pagetable)
  46 {
  47         unsigned long *p, *end;
  48
  49         p = (unsigned long *) addr;
  50         end = p + PTRS_PER_PMD;
  51
  52         do {
  53                 p[0] = pagetable;
  54                 p[1] = pagetable;
  55                 p[2] = pagetable;
  56                 p[3] = pagetable;
  57                 p[4] = pagetable;
  58                 p += 8;
  59                 p[-3] = pagetable;
  60                 p[-2] = pagetable;
  61                 p[-1] = pagetable;
  62         } while (p != end);
  63 }
  64 EXPORT_SYMBOL_GPL(pmd_init);
  65 #endif
  66
  67 pmd_t mk_pmd(struct page *page, pgprot_t prot)
  68 {
  69         pmd_t pmd;
  70
  71         pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
  72
  73         return pmd;
  74 }
  75
  76 void set_pmd_at(struct mm_struct *mm, unsigned long addr,
  77                 pmd_t *pmdp, pmd_t pmd)
  78 {
  79         *pmdp = pmd;
  80         flush_tlb_all();
  81 }
  82
  83 void __init pagetable_init(void)
  84 {
  85         unsigned long vaddr;
  86         pgd_t *pgd_base;
  87
  88         /* Initialize the entire pgd.  */
  89         pgd_init((unsigned long)swapper_pg_dir);
  90 #ifndef __PAGETABLE_PMD_FOLDED
  91         pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
  92 #endif
  93         pgd_base = swapper_pg_dir;
  94         /*
  95          * Fixed mappings:
  96          */
  97         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
  98         fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
  99 }