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#define __ARCH_USE_5LEVEL_HACK
  11#include <asm-generic/pgtable-nopud.h>
  12
  13/* PGDIR_SHIFT determines what a third-level page table entry can map */
  14
  15#ifdef CONFIG_64BIT
  16#define PGDIR_SHIFT     30
  17#else
  18#define PGDIR_SHIFT     31
  19#endif
  20#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  21#define PGDIR_MASK      (~(PGDIR_SIZE-1))
  22
  23/* PMD_SHIFT determines the size of the area a second-level page table can
  24 * map
  25 */
  26
  27#define PMD_SHIFT       21
  28#define PMD_SIZE        (1UL << PMD_SHIFT)
  29#define PMD_MASK        (~(PMD_SIZE-1))
  30
  31/*
  32 * entries per page directory level
  33 */
  34
  35#define PTRS_PER_PTE 512
  36#ifdef CONFIG_64BIT
  37#define PTRS_PER_PMD 512
  38#define PTRS_PER_PGD 512
  39#else
  40#define PTRS_PER_PMD 1024
  41#define PTRS_PER_PGD 1024
  42#endif
  43
  44#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  45#define FIRST_USER_ADDRESS      0UL
  46
  47#define pte_ERROR(e) \
  48        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  49               pte_val(e))
  50#define pmd_ERROR(e) \
  51        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  52               pmd_val(e))
  53#define pgd_ERROR(e) \
  54        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  55               pgd_val(e))
  56
  57#define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
  58#define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
  59#define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
  60#define pud_populate(mm, pud, pmd) \
  61        set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
  62
  63#ifdef CONFIG_64BIT
  64#define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))
  65#else
  66#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
  67#endif
  68
  69static inline int pgd_newpage(pgd_t pgd)
  70{
  71        return(pgd_val(pgd) & _PAGE_NEWPAGE);
  72}
  73
  74static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
  75
  76#ifdef CONFIG_64BIT
  77#define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))
  78#else
  79#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  80#endif
  81
  82struct mm_struct;
  83extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
  84
  85static inline void pud_clear (pud_t *pud)
  86{
  87        set_pud(pud, __pud(_PAGE_NEWPAGE));
  88}
  89
  90#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
  91#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
  92
  93/* Find an entry in the second-level page table.. */
  94#define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
  95                        pmd_index(address))
  96
  97static inline unsigned long pte_pfn(pte_t pte)
  98{
  99        return phys_to_pfn(pte_val(pte));
 100}
 101
 102static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 103{
 104        pte_t pte;
 105        phys_t phys = pfn_to_phys(page_nr);
 106
 107        pte_set_val(pte, phys, pgprot);
 108        return pte;
 109}
 110
 111static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 112{
 113        return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 114}
 115
 116#endif
 117
 118