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, unsigned long addr,
  30                                           pte_t *ptep, pte_t pte)
  31 {
  32         native_set_pte(ptep, pte);
  33 }
  34
  35 static inline void native_pmd_clear(pmd_t *pmdp)
  36 {
  37         native_set_pmd(pmdp, __pmd(0));
  38 }
  39
  40 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *xp)
  41 {
  42         *xp = native_make_pte(0);
  43 }
  44
  45 #ifdef CONFIG_SMP
  46 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  47 {
  48         return __pte(xchg(&xp->pte_low, 0));
  49 }
  50 #else
  51 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
  52 #endif
  53
  54 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  55 #define pte_none(x)             (!(x).pte_low)
  56 #define pte_pfn(x)              (pte_val(x) >> PAGE_SHIFT)
  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) + (((off) >> 5) << 8) + _PAGE_FILE })
  69
  70 /* Encode and de-code a swap entry */
  71 #define __swp_type(x)                   (((x).val >> 1) & 0x1f)
  72 #define __swp_offset(x)                 ((x).val >> 8)
  73 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
  74 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { (pte).pte_low })
  75 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
  76
  77 #endif /* _I386_PGTABLE_2LEVEL_H */