include/asm-i386/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 pmd_ERROR(e) \
   7         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
   8 #define pgd_ERROR(e) \
   9         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  10
  11 /*
  12  * The "pgd_xxx()" functions here are trivial for a folded two-level
  13  * setup: the pgd is never bad, and a pmd always exists (as it's folded
  14  * into the pgd entry)
  15  */
  16 static inline int pgd_none(pgd_t pgd)           { return 0; }
  17 static inline int pgd_bad(pgd_t pgd)            { return 0; }
  18 static inline int pgd_present(pgd_t pgd)        { return 1; }
  19 #define pgd_clear(xp)                           do { } while (0)
  20
  21 /*
  22  * Certain architectures need to do special things when PTEs
  23  * within a page table are directly modified.  Thus, the following
  24  * hook is made available.
  25  */
  26 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  27 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
  28 /*
  29  * (pmds are folded into pgds so this doesn't get actually called,
  30  * but the define is needed for a generic inline function.)
  31  */
  32 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
  33 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
  34
  35 #define pgd_page(pgd) \
  36 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
  37
  38 static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
  39 {
  40         return (pmd_t *) dir;
  41 }
  42 #define ptep_get_and_clear(xp)  __pte(xchg(&(xp)->pte_low, 0))
  43 #define pte_same(a, b)          ((a).pte_low == (b).pte_low)
  44 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  45 #define pte_none(x)             (!(x).pte_low)
  46 #define pte_pfn(x)              ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
  47 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  48 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  49
  50 /*
  51  * All present user pages are user-executable:
  52  */
  53 static inline int pte_exec(pte_t pte)
  54 {
  55         return pte_user(pte);
  56 }
  57
  58 /*
  59  * All present pages are kernel-executable:
  60  */
  61 static inline int pte_exec_kernel(pte_t pte)
  62 {
  63         return 1;
  64 }
  65
  66 /*
  67  * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
  68  * into this range:
  69  */
  70 #define PTE_FILE_MAX_BITS       29
  71
  72 #define pte_to_pgoff(pte) \
  73         ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
  74
  75 #define pgoff_to_pte(off) \
  76         ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
  77
  78 /* Encode and de-code a swap entry */
  79 #define __swp_type(x)                   (((x).val >> 1) & 0x1f)
  80 #define __swp_offset(x)                 ((x).val >> 8)
  81 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
  82 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { (pte).pte_low })
  83 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
  84
  85 #endif /* _I386_PGTABLE_2LEVEL_H */