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 /*
  62  * Since this is only called on user PTEs, and the page fault handler
  63  * must handle the already racy situation of simultaneous page faults,
  64  * we are justified in merely clearing the PTE present bit, followed
  65  * by a set.  The ordering here is important.
  66  */
  67 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
  68 {
  69         ptep->pte_low = 0;
  70         smp_wmb();
  71         ptep->pte_high = pte.pte_high;
  72         smp_wmb();
  73         ptep->pte_low = pte.pte_low;
  74 }
  75
  76 #define set_pte_atomic(pteptr,pteval) \
  77                 set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
  78 #define set_pmd(pmdptr,pmdval) \
  79                 set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
  80 #define set_pud(pudptr,pudval) \
  81                 (*(pudptr) = (pudval))
  82
  83 /*
  84  * Pentium-II erratum A13: in PAE mode we explicitly have to flush
  85  * the TLB via cr3 if the top-level pgd is changed...
  86  * We do not let the generic code free and clear pgd entries due to
  87  * this erratum.
  88  */
  89 static inline void pud_clear (pud_t * pud) { }
  90
  91 #define pud_page(pud) \
  92 ((struct page *) __va(pud_val(pud) & PAGE_MASK))
  93
  94 #define pud_page_vaddr(pud) \
  95 ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
  96
  97
  98 /* Find an entry in the second-level page table.. */
  99 #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
 100                         pmd_index(address))
 101
 102 /*
 103  * For PTEs and PDEs, we must clear the P-bit first when clearing a page table
 104  * entry, so clear the bottom half first and enforce ordering with a compiler
 105  * barrier.
 106  */
 107 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 108 {
 109         ptep->pte_low = 0;
 110         smp_wmb();
 111         ptep->pte_high = 0;
 112 }
 113
 114 static inline void pmd_clear(pmd_t *pmd)
 115 {
 116         u32 *tmp = (u32 *)pmd;
 117         *tmp = 0;
 118         smp_wmb();
 119         *(tmp + 1) = 0;
 120 }
 121
 122 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 123 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 124 {
 125         pte_t res;
 126
 127         /* xchg acts as a barrier before the setting of the high bits */
 128         res.pte_low = xchg(&ptep->pte_low, 0);
 129         res.pte_high = ptep->pte_high;
 130         ptep->pte_high = 0;
 131
 132         return res;
 133 }
 134
 135 #define __HAVE_ARCH_PTE_SAME
 136 static inline int pte_same(pte_t a, pte_t b)
 137 {
 138         return a.pte_low == b.pte_low && a.pte_high == b.pte_high;
 139 }
 140
 141 #define pte_page(x)     pfn_to_page(pte_pfn(x))
 142
 143 static inline int pte_none(pte_t pte)
 144 {
 145         return !pte.pte_low && !pte.pte_high;
 146 }
 147
 148 static inline unsigned long pte_pfn(pte_t pte)
 149 {
 150         return (pte.pte_low >> PAGE_SHIFT) |
 151                 (pte.pte_high << (32 - PAGE_SHIFT));
 152 }
 153
 154 extern unsigned long long __supported_pte_mask;
 155
 156 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 157 {
 158         pte_t pte;
 159
 160         pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | \
 161                                         (pgprot_val(pgprot) >> 32);
 162         pte.pte_high &= (__supported_pte_mask >> 32);
 163         pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & \
 164                                                         __supported_pte_mask;
 165         return pte;
 166 }
 167
 168 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 169 {
 170         return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) | \
 171                         pgprot_val(pgprot)) & __supported_pte_mask);
 172 }
 173
 174 /*
 175  * Bits 0, 6 and 7 are taken in the low part of the pte,
 176  * put the 32 bits of offset into the high part.
 177  */
 178 #define pte_to_pgoff(pte) ((pte).pte_high)
 179 #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
 180 #define PTE_FILE_MAX_BITS       32
 181
 182 /* Encode and de-code a swap entry */
 183 #define __swp_type(x)                   (((x).val) & 0x1f)
 184 #define __swp_offset(x)                 ((x).val >> 5)
 185 #define __swp_entry(type, offset)       ((swp_entry_t){(type) | (offset) << 5})
 186 #define __pte_to_swp_entry(pte)         ((swp_entry_t){ (pte).pte_high })
 187 #define __swp_entry_to_pte(x)           ((pte_t){ 0, (x).val })
 188
 189 #define __pmd_free_tlb(tlb, x)          do { } while (0)
 190
 191 #define vmalloc_sync_all() ((void)0)
 192
 193 #endif /* _I386_PGTABLE_3LEVEL_H */