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 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 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
  19                                      pte_t *ptep , pte_t pte)
  20 {
  21         native_set_pte(ptep, pte);
  22 }
  23 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  24 {
  25         *pmdp = pmd;
  26 }
  27 #ifndef CONFIG_PARAVIRT
  28 #define set_pte(pteptr, pteval)         native_set_pte(pteptr, pteval)
  29 #define set_pte_at(mm,addr,ptep,pteval) native_set_pte_at(mm, addr, ptep, pteval)
  30 #define set_pmd(pmdptr, pmdval)         native_set_pmd(pmdptr, pmdval)
  31 #endif
  32
  33 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
  34 #define set_pte_present(mm,addr,ptep,pteval) set_pte_at(mm,addr,ptep,pteval)
  35
  36 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
  37 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
  38
  39 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *xp)
  40 {
  41         *xp = __pte(0);
  42 }
  43
  44 #ifdef CONFIG_SMP
  45 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  46 {
  47         return __pte(xchg(&xp->pte_low, 0));
  48 }
  49 #else
  50 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
  51 #endif
  52
  53 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  54 #define pte_none(x)             (!(x).pte_low)
  55 #define pte_pfn(x)              (pte_val(x) >> PAGE_SHIFT)
  56 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  57 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  58
  59 /*
  60  * All present user pages are user-executable:
  61  */
  62 static inline int pte_exec(pte_t pte)
  63 {
  64         return pte_user(pte);
  65 }
  66
  67 /*
  68  * All present pages are kernel-executable:
  69  */
  70 static inline int pte_exec_kernel(pte_t pte)
  71 {
  72         return 1;
  73 }
  74
  75 /*
  76  * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
  77  * into this range:
  78  */
  79 #define PTE_FILE_MAX_BITS       29
  80
  81 #define pte_to_pgoff(pte) \
  82         ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
  83
  84 #define pgoff_to_pte(off) \
  85         ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
  86
  87 /* Encode and de-code a swap entry */
  88 #define __swp_type(x)                   (((x).val >> 1) & 0x1f)
  89 #define __swp_offset(x)                 ((x).val >> 8)
  90 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
  91 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { (pte).pte_low })
  92 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
  93
  94 #endif /* _I386_PGTABLE_2LEVEL_H */