include/asm-i386/pgtable-3level.h

   1 #ifndef _I386_PGTABLE_3LEVEL_H
   2 #define _I386_PGTABLE_3LEVEL_H
   3
   4 #include <asm-generic/pgtable-nopud.h>
   5
   6 /*
   7  * Intel Physical Address Extension (PAE) Mode - three-level page
   8  * tables on PPro+ CPUs.
   9  *
  10  * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
  11  */
  12
  13 #define pte_ERROR(e) \
  14         printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, &(e), (e).pte_high, (e).pte_low)
  15 #define pmd_ERROR(e) \
  16         printk("%s:%d: bad pmd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
  17 #define pgd_ERROR(e) \
  18         printk("%s:%d: bad pgd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
  19
  20 #define pud_none(pud)                           0
  21 #define pud_bad(pud)                            0
  22 #define pud_present(pud)                        1
  23
  24 /*
  25  * Is the pte executable?
  26  */
  27 static inline int pte_x(pte_t pte)
  28 {
  29         return !(pte_val(pte) & _PAGE_NX);
  30 }
  31
  32 /*
  33  * All present user-pages with !NX bit are user-executable:
  34  */
  35 static inline int pte_exec(pte_t pte)
  36 {
  37         return pte_user(pte) && pte_x(pte);
  38 }
  39 /*
  40  * All present pages with !NX bit are kernel-executable:
  41  */
  42 static inline int pte_exec_kernel(pte_t pte)
  43 {
  44         return pte_x(pte);
  45 }
  46
  47 /* Rules for using set_pte: the pte being assigned *must* be
  48  * either not present or in a state where the hardware will
  49  * not attempt to update the pte.  In places where this is
  50  * not possible, use pte_get_and_clear to obtain the old pte
  51  * value and then use set_pte to update it.  -ben
  52  */
  53 static inline void set_pte(pte_t *ptep, pte_t pte)
  54 {
  55         ptep->pte_high = pte.pte_high;
  56         smp_wmb();
  57         ptep->pte_low = pte.pte_low;
  58 }
  59 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  60
  61 #define __HAVE_ARCH_SET_PTE_ATOMIC
  62 #define set_pte_atomic(pteptr,pteval) \
  63                 set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
  64 #define set_pmd(pmdptr,pmdval) \
  65                 set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
  66 #define set_pud(pudptr,pudval) \
  67                 (*(pudptr) = (pudval))
  68
  69 /*
  70  * Pentium-II erratum A13: in PAE mode we explicitly have to flush
  71  * the TLB via cr3 if the top-level pgd is changed...
  72  * We do not let the generic code free and clear pgd entries due to
  73  * this erratum.
  74  */
  75 static inline void pud_clear (pud_t * pud) { }
  76
  77 #define pud_page(pud) \
  78 ((struct page *) __va(pud_val(pud) & PAGE_MASK))
  79
  80 #define pud_page_kernel(pud) \
  81 ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
  82
  83
  84 /* Find an entry in the second-level page table.. */
  85 #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
  86                         pmd_index(address))
  87
  88 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
  89 {
  90         pte_t res;
  91
  92         /* xchg acts as a barrier before the setting of the high bits */
  93         res.pte_low = xchg(&ptep->pte_low, 0);
  94         res.pte_high = ptep->pte_high;
  95         ptep->pte_high = 0;
  96
  97         return res;
  98 }
  99
 100 static inline int pte_same(pte_t a, pte_t b)
 101 {
 102         return a.pte_low == b.pte_low && a.pte_high == b.pte_high;
 103 }
 104
 105 #define pte_page(x)     pfn_to_page(pte_pfn(x))
 106
 107 static inline int pte_none(pte_t pte)
 108 {
 109         return !pte.pte_low && !pte.pte_high;
 110 }
 111
 112 static inline unsigned long pte_pfn(pte_t pte)
 113 {
 114         return (pte.pte_low >> PAGE_SHIFT) |
 115                 (pte.pte_high << (32 - PAGE_SHIFT));
 116 }
 117
 118 extern unsigned long long __supported_pte_mask;
 119
 120 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 121 {
 122         pte_t pte;
 123
 124         pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | \
 125                                         (pgprot_val(pgprot) >> 32);
 126         pte.pte_high &= (__supported_pte_mask >> 32);
 127         pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & \
 128                                                         __supported_pte_mask;
 129         return pte;
 130 }
 131
 132 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 133 {
 134         return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) | \
 135                         pgprot_val(pgprot)) & __supported_pte_mask);
 136 }
 137
 138 /*
 139  * Bits 0, 6 and 7 are taken in the low part of the pte,
 140  * put the 32 bits of offset into the high part.
 141  */
 142 #define pte_to_pgoff(pte) ((pte).pte_high)
 143 #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
 144 #define PTE_FILE_MAX_BITS       32
 145
 146 /* Encode and de-code a swap entry */
 147 #define __swp_type(x)                   (((x).val) & 0x1f)
 148 #define __swp_offset(x)                 ((x).val >> 5)
 149 #define __swp_entry(type, offset)       ((swp_entry_t){(type) | (offset) << 5})
 150 #define __pte_to_swp_entry(pte)         ((swp_entry_t){ (pte).pte_high })
 151 #define __swp_entry_to_pte(x)           ((pte_t){ 0, (x).val })
 152
 153 #define __pmd_free_tlb(tlb, x)          do { } while (0)
 154
 155 #endif /* _I386_PGTABLE_3LEVEL_H */