include/asm-i386/pgtable-2level.h

   1 #ifndef _I386_PGTABLE_2LEVEL_H
   2 #define _I386_PGTABLE_2LEVEL_H
   3
   4 #include <asm-generic/pgtable-nopmd.h>
   5
   6 #define pte_ERROR(e) \
   7         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
   8 #define pgd_ERROR(e) \
   9         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  10
  11 /*
  12  * Certain architectures need to do special things when PTEs
  13  * within a page table are directly modified.  Thus, the following
  14  * hook is made available.
  15  */
  16 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  17 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  18 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
  19 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  20
  21 #define ptep_get_and_clear(mm,addr,xp)  __pte(xchg(&(xp)->pte_low, 0))
  22 #define pte_same(a, b)          ((a).pte_low == (b).pte_low)
  23 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  24 #define pte_none(x)             (!(x).pte_low)
  25 #define pte_pfn(x)              ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
  26 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  27 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  28
  29 /*
  30  * All present user pages are user-executable:
  31  */
  32 static inline int pte_exec(pte_t pte)
  33 {
  34         return pte_user(pte);
  35 }
  36
  37 /*
  38  * All present pages are kernel-executable:
  39  */
  40 static inline int pte_exec_kernel(pte_t pte)
  41 {
  42         return 1;
  43 }
  44
  45 /*
  46  * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
  47  * into this range:
  48  */
  49 #define PTE_FILE_MAX_BITS       29
  50
  51 #define pte_to_pgoff(pte) \
  52         ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
  53
  54 #define pgoff_to_pte(off) \
  55         ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
  56
  57 /* Encode and de-code a swap entry */
  58 #define __swp_type(x)                   (((x).val >> 1) & 0x1f)
  59 #define __swp_offset(x)                 ((x).val >> 8)
  60 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
  61 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { (pte).pte_low })
  62 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
  63
  64 #endif /* _I386_PGTABLE_2LEVEL_H */