arch/s390/include/asm/hugetlb.h

   1 /*
   2  *  IBM System z Huge TLB Page Support for Kernel.
   3  *
   4  *    Copyright IBM Corp. 2008
   5  *    Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
   6  */
   7
   8 #ifndef _ASM_S390_HUGETLB_H
   9 #define _ASM_S390_HUGETLB_H
  10
  11 #include <asm/page.h>
  12 #include <asm/pgtable.h>
  13
  14
  15 #define is_hugepage_only_range(mm, addr, len)   0
  16 #define hugetlb_free_pgd_range                  free_pgd_range
  17
  18 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  19                      pte_t *ptep, pte_t pte);
  20 pte_t huge_ptep_get(pte_t *ptep);
  21 pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  22                               unsigned long addr, pte_t *ptep);
  23
  24 /*
  25  * If the arch doesn't supply something else, assume that hugepage
  26  * size aligned regions are ok without further preparation.
  27  */
  28 static inline int prepare_hugepage_range(struct file *file,
  29                         unsigned long addr, unsigned long len)
  30 {
  31         if (len & ~HPAGE_MASK)
  32                 return -EINVAL;
  33         if (addr & ~HPAGE_MASK)
  34                 return -EINVAL;
  35         return 0;
  36 }
  37
  38 #define arch_clear_hugepage_flags(page)         do { } while (0)
  39
  40 static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
  41                                   pte_t *ptep)
  42 {
  43         pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
  44 }
  45
  46 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  47                                          unsigned long address, pte_t *ptep)
  48 {
  49         huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
  50 }
  51
  52 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  53                                              unsigned long addr, pte_t *ptep,
  54                                              pte_t pte, int dirty)
  55 {
  56         int changed = !pte_same(huge_ptep_get(ptep), pte);
  57         if (changed) {
  58                 huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
  59                 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
  60         }
  61         return changed;
  62 }
  63
  64 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  65                                            unsigned long addr, pte_t *ptep)
  66 {
  67         pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
  68         set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
  69 }
  70
  71 static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
  72 {
  73         return mk_pte(page, pgprot);
  74 }
  75
  76 static inline int huge_pte_none(pte_t pte)
  77 {
  78         return pte_none(pte);
  79 }
  80
  81 static inline int huge_pte_write(pte_t pte)
  82 {
  83         return pte_write(pte);
  84 }
  85
  86 static inline int huge_pte_dirty(pte_t pte)
  87 {
  88         return pte_dirty(pte);
  89 }
  90
  91 static inline pte_t huge_pte_mkwrite(pte_t pte)
  92 {
  93         return pte_mkwrite(pte);
  94 }
  95
  96 static inline pte_t huge_pte_mkdirty(pte_t pte)
  97 {
  98         return pte_mkdirty(pte);
  99 }
 100
 101 static inline pte_t huge_pte_wrprotect(pte_t pte)
 102 {
 103         return pte_wrprotect(pte);
 104 }
 105
 106 static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
 107 {
 108         return pte_modify(pte, newprot);
 109 }
 110
 111 #endif /* _ASM_S390_HUGETLB_H */