include/asm-um/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_PGD_NR       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
  35 static inline int pgd_newpage(pgd_t pgd)        { return 0; }
  36 static inline void pgd_mkuptodate(pgd_t pgd)    { }
  37
  38 #define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
  39
  40 static inline pte_t pte_mknewprot(pte_t pte)
  41 {
  42         pte_val(pte) |= _PAGE_NEWPROT;
  43         return(pte);
  44 }
  45
  46 static inline pte_t pte_mknewpage(pte_t pte)
  47 {
  48         pte_val(pte) |= _PAGE_NEWPAGE;
  49         return(pte);
  50 }
  51
  52 static inline void set_pte(pte_t *pteptr, pte_t pteval)
  53 {
  54         /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
  55          * fix_range knows to unmap it.  _PAGE_NEWPROT is specific to
  56          * mapped pages.
  57          */
  58         *pteptr = pte_mknewpage(pteval);
  59         if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
  60 }
  61 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  62
  63 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  64
  65 #define pte_page(x) pfn_to_page(pte_pfn(x))
  66 #define pte_none(x) !(pte_val(x) & ~_PAGE_NEWPAGE)
  67 #define pte_pfn(x) phys_to_pfn(pte_val(x))
  68 #define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
  69 #define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
  70
  71 #define pmd_page_kernel(pmd) \
  72         ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
  73
  74 /*
  75  * Bits 0 through 3 are taken
  76  */
  77 #define PTE_FILE_MAX_BITS       28
  78
  79 #define pte_to_pgoff(pte) (pte_val(pte) >> 4)
  80
  81 #define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE })
  82
  83 #endif