LXR linux/arch/um/include/asm/pgtable-2level.h

   1/*
   2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
   3 * Copyright 2003 PathScale, Inc.
   4 * Derived from include/asm-i386/pgtable.h
   5 * Licensed under the GPL
   6 */
   7
   8#ifndef __UM_PGTABLE_2LEVEL_H
   9#define __UM_PGTABLE_2LEVEL_H
  10
  11#include <asm-generic/pgtable-nopmd.h>
  12
  13/* PGDIR_SHIFT determines what a third-level page table entry can map */
  14
  15#define PGDIR_SHIFT     22
  16#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  17#define PGDIR_MASK      (~(PGDIR_SIZE-1))
  18
  19/*
  20 * entries per page directory level: the i386 is two-level, so
  21 * we don't really have any PMD directory physically.
  22 */
  23#define PTRS_PER_PTE    1024
  24#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
  25#define PTRS_PER_PGD    1024
  26#define FIRST_USER_ADDRESS      0
  27
  28#define pte_ERROR(e) \
  29        printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
  30               pte_val(e))
  31#define pgd_ERROR(e) \
  32        printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
  33               pgd_val(e))
  34
  35static inline int pgd_newpage(pgd_t pgd)        { return 0; }
  36static inline void pgd_mkuptodate(pgd_t pgd)    { }
  37
  38#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  39
  40#define pte_pfn(x) phys_to_pfn(pte_val(x))
  41#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
  42#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
  43
  44/*
  45 * Bits 0 through 4 are taken
  46 */
  47#define PTE_FILE_MAX_BITS       27
  48
  49#define pte_to_pgoff(pte) (pte_val(pte) >> 5)
  50
  51#define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE })
  52
  53#endif
  54