LXR linux/include/asm-um/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#define PGDIR_SHIFT     30
  15#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  16#define PGDIR_MASK      (~(PGDIR_SIZE-1))
  17
  18/* PMD_SHIFT determines the size of the area a second-level page table can
  19 * map
  20 */
  21
  22#define PMD_SHIFT       21
  23#define PMD_SIZE        (1UL << PMD_SHIFT)
  24#define PMD_MASK        (~(PMD_SIZE-1))
  25
  26/*
  27 * entries per page directory level
  28 */
  29
  30#define PTRS_PER_PTE 512
  31#define PTRS_PER_PMD 512
  32#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  33#define PTRS_PER_PGD 512
  34#define FIRST_USER_PGD_NR       0
  35
  36#define pte_ERROR(e) \
  37        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  38               pte_val(e))
  39#define pmd_ERROR(e) \
  40        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  41               pmd_val(e))
  42#define pgd_ERROR(e) \
  43        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
  44               pgd_val(e))
  45
  46#define pud_none(x)     (!(pud_val(x) & ~_PAGE_NEWPAGE))
  47#define pud_bad(x)      ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
  48#define pud_present(x)  (pud_val(x) & _PAGE_PRESENT)
  49#define pud_populate(mm, pud, pmd) \
  50        set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
  51
  52#define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))
  53static inline int pgd_newpage(pgd_t pgd)
  54{
  55        return(pgd_val(pgd) & _PAGE_NEWPAGE);
  56}
  57
  58static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
  59
  60
  61#define pte_present(x)  pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
  62
  63static inline pte_t pte_mknewprot(pte_t pte)
  64{
  65        pte_set_bits(pte, _PAGE_NEWPROT);
  66        return(pte);
  67}
  68
  69static inline pte_t pte_mknewpage(pte_t pte)
  70{
  71        pte_set_bits(pte, _PAGE_NEWPAGE);
  72        return(pte);
  73}
  74
  75static inline void set_pte(pte_t *pteptr, pte_t pteval)
  76{
  77        pte_copy(*pteptr, pteval);
  78
  79        /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
  80         * fix_range knows to unmap it.  _PAGE_NEWPROT is specific to
  81         * mapped pages.
  82         */
  83
  84        *pteptr = pte_mknewpage(*pteptr);
  85        if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
  86}
  87
  88#define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
  89
  90static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  91{
  92        pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
  93
  94        if(pmd)
  95                memset(pmd, 0, PAGE_SIZE);
  96
  97        return pmd;
  98}
  99
 100static inline void pmd_free(pmd_t *pmd){
 101        free_page((unsigned long) pmd);
 102}
 103
 104#define __pmd_free_tlb(tlb,x)   do { } while (0)
 105
 106static inline void pud_clear (pud_t * pud) { }
 107
 108#define pud_page(pud) \
 109        ((struct page *) __va(pud_val(pud) & PAGE_MASK))
 110
 111/* Find an entry in the second-level page table.. */
 112#define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
 113                        pmd_index(address))
 114
 115#define pte_page(x) pfn_to_page(pte_pfn(x))
 116
 117static inline int pte_none(pte_t pte)
 118{
 119        return pte_is_zero(pte);
 120}
 121
 122static inline unsigned long pte_pfn(pte_t pte)
 123{
 124        return phys_to_pfn(pte_val(pte));
 125}
 126
 127static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
 128{
 129        pte_t pte;
 130        phys_t phys = pfn_to_phys(page_nr);
 131
 132        pte_set_val(pte, phys, pgprot);
 133        return pte;
 134}
 135
 136static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
 137{
 138        return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
 139}
 140
 141/*
 142 * Bits 0 through 3 are taken in the low part of the pte,
 143 * put the 32 bits of offset into the high part.
 144 */
 145#define PTE_FILE_MAX_BITS       32
 146
 147#ifdef CONFIG_64_BIT
 148
 149#define pte_to_pgoff(p) ((p).pte >> 32)
 150
 151#define pgoff_to_pte(off) ((pte_t) { ((off) < 32) | _PAGE_FILE })
 152
 153#else
 154
 155#define pte_to_pgoff(pte) ((pte).pte_high)
 156
 157#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
 158
 159#endif
 160
 161#endif
 162
 163/*
 164 * Overrides for Emacs so that we follow Linus's tabbing style.
 165 * Emacs will notice this stuff at the end of the file and automatically
 166 * adjust the settings for this buffer only.  This must remain at the end
 167 * of the file.
 168 * ---------------------------------------------------------------------------
 169 * Local variables:
 170 * c-file-style: "linux"
 171 * End:
 172 */
 173