include/asm-x86/pgtable-2level.h

   1 #ifndef _I386_PGTABLE_2LEVEL_H
   2 #define _I386_PGTABLE_2LEVEL_H
   3
   4 #define pte_ERROR(e) \
   5         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
   6 #define pgd_ERROR(e) \
   7         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
   8
   9 /*
  10  * Certain architectures need to do special things when PTEs
  11  * within a page table are directly modified.  Thus, the following
  12  * hook is made available.
  13  */
  14 static inline void native_set_pte(pte_t *ptep , pte_t pte)
  15 {
  16         *ptep = pte;
  17 }
  18
  19 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  20 {
  21         *pmdp = pmd;
  22 }
  23
  24 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  25 {
  26         native_set_pte(ptep, pte);
  27 }
  28
  29 static inline void native_set_pte_present(struct mm_struct *mm,
  30                                           unsigned long addr,
  31                                           pte_t *ptep, pte_t pte)
  32 {
  33         native_set_pte(ptep, pte);
  34 }
  35
  36 static inline void native_pmd_clear(pmd_t *pmdp)
  37 {
  38         native_set_pmd(pmdp, __pmd(0));
  39 }
  40
  41 static inline void native_pte_clear(struct mm_struct *mm,
  42                                     unsigned long addr, pte_t *xp)
  43 {
  44         *xp = native_make_pte(0);
  45 }
  46
  47 #ifdef CONFIG_SMP
  48 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  49 {
  50         return __pte(xchg(&xp->pte_low, 0));
  51 }
  52 #else
  53 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
  54 #endif
  55
  56 #define pte_none(x)             (!(x).pte_low)
  57
  58 /*
  59  * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
  60  * into this range:
  61  */
  62 #define PTE_FILE_MAX_BITS       29
  63
  64 #define pte_to_pgoff(pte)                                               \
  65         ((((pte).pte_low >> 1) & 0x1f) + (((pte).pte_low >> 8) << 5))
  66
  67 #define pgoff_to_pte(off)                                               \
  68         ((pte_t) { .pte_low = (((off) & 0x1f) << 1) +                   \
  69                         (((off) >> 5) << 8) + _PAGE_FILE })
  70
  71 /* Encode and de-code a swap entry */
  72 #define __swp_type(x)                   (((x).val >> 1) & 0x1f)
  73 #define __swp_offset(x)                 ((x).val >> 8)
  74 #define __swp_entry(type, offset)                               \
  75         ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
  76 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { (pte).pte_low })
  77 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
  78
  79 #endif /* _I386_PGTABLE_2LEVEL_H */