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

   1 #ifndef _ASM_X86_PGTABLE_2LEVEL_H
   2 #define _ASM_X86_PGTABLE_2LEVEL_H
   3
   4 #define pte_ERROR(e) \
   5         pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
   6 #define pgd_ERROR(e) \
   7         pr_err("%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_pud(pud_t *pudp, pud_t pud)
  25 {
  26 }
  27
  28 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  29 {
  30         native_set_pte(ptep, pte);
  31 }
  32
  33 static inline void native_pmd_clear(pmd_t *pmdp)
  34 {
  35         native_set_pmd(pmdp, __pmd(0));
  36 }
  37
  38 static inline void native_pud_clear(pud_t *pudp)
  39 {
  40 }
  41
  42 static inline void native_pte_clear(struct mm_struct *mm,
  43                                     unsigned long addr, pte_t *xp)
  44 {
  45         *xp = native_make_pte(0);
  46 }
  47
  48 #ifdef CONFIG_SMP
  49 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  50 {
  51         return __pte(xchg(&xp->pte_low, 0));
  52 }
  53 #else
  54 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
  55 #endif
  56
  57 #ifdef CONFIG_SMP
  58 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  59 {
  60         return __pmd(xchg((pmdval_t *)xp, 0));
  61 }
  62 #else
  63 #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
  64 #endif
  65
  66 #ifdef CONFIG_SMP
  67 static inline pud_t native_pudp_get_and_clear(pud_t *xp)
  68 {
  69         return __pud(xchg((pudval_t *)xp, 0));
  70 }
  71 #else
  72 #define native_pudp_get_and_clear(xp) native_local_pudp_get_and_clear(xp)
  73 #endif
  74
  75 /* Bit manipulation helper on pte/pgoff entry */
  76 static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift,
  77                                       unsigned long mask, unsigned int leftshift)
  78 {
  79         return ((value >> rightshift) & mask) << leftshift;
  80 }
  81
  82 /* Encode and de-code a swap entry */
  83 #define SWP_TYPE_BITS 5
  84 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
  85
  86 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
  87
  88 #define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
  89                                          & ((1U << SWP_TYPE_BITS) - 1))
  90 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
  91 #define __swp_entry(type, offset)       ((swp_entry_t) { \
  92                                          ((type) << (_PAGE_BIT_PRESENT + 1)) \
  93                                          | ((offset) << SWP_OFFSET_SHIFT) })
  94 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { (pte).pte_low })
  95 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
  96
  97 #endif /* _ASM_X86_PGTABLE_2LEVEL_H */