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