LXR linux/arch/um/include/asm/pgtable-3level.h

   1/*
   2 * Copyright 2003 PathScale Inc
   3 * Derived from include/asm-i386/pgtable.h
   4 * Licensed under the GPL
   5 */
   6
   7#ifndef __UM_PGTABLE_3LEVEL_H
   8#define __UM_PGTABLE_3LEVEL_H
   9
  10#include <asm-generic/pgtable-nopud.h>
  11
  12/* PGDIR_SHIFT determines what a third-level page table entry can map */
  13
  14#ifdef CONFIG_64BIT
  15#define PGDIR_SHIFT     30
  16#else
  17#define PGDIR_SHIFT     31
  18#endif
  19#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  20#define PGDIR_MASK      (~(PGDIR_SIZE-1))
  21
  22/* PMD_SHIFT determines the size of the area a second-level page table can
  23 * map
  24 */
  25
  26#define PMD_SHIFT       21
  27#define PMD_SIZE        (1UL << PMD_SHIFT)
  28#define PMD_MASK        (~(PMD_SIZE-1))
  29
  30/*
  31 * entries per page directory level
  32 */
  33
  34#define PTRS_PER_PTE 512
  35#ifdef CONFIG_64BIT
  36#define PTRS_PER_PMD 512
  37#define PTRS_PER_PGD 512
  38#else
  39#define PTRS_PER_PMD 1024
  40#define PTRS_PER_PGD 1024
  41#endif
  42
  43#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  44#define FIRST_USER_ADDRESS      0
  45
  46#define pte_ERROR(e) \
  47        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  48               pte_val(e))
  49#define pmd_ERROR(e) \
  50        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  51               pmd_val(e))
  52#define pgd_ERROR(e) \
  53        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  54               pgd_val(e))
  55
  56#define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
  57#define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
  58#define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
  59#define pud_populate(mm, pud, pmd) \
  60        set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
  61
  62#ifdef CONFIG_64BIT
  63#define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))
  64#else
  65#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
  66#endif
  67
  68static inline int pgd_newpage(pgd_t pgd)
  69{
  70        return(pgd_val(pgd) & _PAGE_NEWPAGE);
  71}
  72
  73static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
  74
  75#ifdef CONFIG_64BIT
  76#define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
  77#else
  78#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  79#endif
  80
  81struct mm_struct;
  82extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
  83
  84static inline void pud_clear (pud_t *pud)
  85{
  86        set_pud(pud, __pud(_PAGE_NEWPAGE));
  87}
  88
  89#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
  90#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
  91
  92/* Find an entry in the second-level page table.. */
  93#define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
  94                        pmd_index(address))
  95
  96static inline unsigned long pte_pfn(pte_t pte)
  97{
  98        return phys_to_pfn(pte_val(pte));
  99}
 100
 101static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
 102{
 103        pte_t pte;
 104        phys_t phys = pfn_to_phys(page_nr);
 105
 106        pte_set_val(pte, phys, pgprot);
 107        return pte;
 108}
 109
 110static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
 111{
 112        return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 113}
 114
 115/*
 116 * Bits 0 through 3 are taken in the low part of the pte,
 117 * put the 32 bits of offset into the high part.
 118 */
 119#define PTE_FILE_MAX_BITS       32
 120
 121#ifdef CONFIG_64BIT
 122
 123#define pte_to_pgoff(p) ((p).pte >> 32)
 124
 125#define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
 126
 127#else
 128
 129#define pte_to_pgoff(pte) ((pte).pte_high)
 130
 131#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
 132
 133#endif
 134
 135#endif
 136
 137