arch/arm64/include/asm/hugetlb.h

   1 /*
   2  * arch/arm64/include/asm/hugetlb.h
   3  *
   4  * Copyright (C) 2013 Linaro Ltd.
   5  *
   6  * Based on arch/x86/include/asm/hugetlb.h
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #ifndef __ASM_HUGETLB_H
  19 #define __ASM_HUGETLB_H
  20
  21 #include <asm/page.h>
  22
  23 static inline pte_t huge_ptep_get(pte_t *ptep)
  24 {
  25         return READ_ONCE(*ptep);
  26 }
  27
  28
  29
  30 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
  31                                           unsigned long addr, unsigned long end,
  32                                           unsigned long floor,
  33                                           unsigned long ceiling)
  34 {
  35         free_pgd_range(tlb, addr, end, floor, ceiling);
  36 }
  37
  38 static inline int is_hugepage_only_range(struct mm_struct *mm,
  39                                          unsigned long addr, unsigned long len)
  40 {
  41         return 0;
  42 }
  43
  44 static inline int prepare_hugepage_range(struct file *file,
  45                                          unsigned long addr, unsigned long len)
  46 {
  47         struct hstate *h = hstate_file(file);
  48         if (len & ~huge_page_mask(h))
  49                 return -EINVAL;
  50         if (addr & ~huge_page_mask(h))
  51                 return -EINVAL;
  52         return 0;
  53 }
  54
  55 static inline int huge_pte_none(pte_t pte)
  56 {
  57         return pte_none(pte);
  58 }
  59
  60 static inline pte_t huge_pte_wrprotect(pte_t pte)
  61 {
  62         return pte_wrprotect(pte);
  63 }
  64
  65 static inline void arch_clear_hugepage_flags(struct page *page)
  66 {
  67         clear_bit(PG_dcache_clean, &page->flags);
  68 }
  69
  70 extern pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
  71                                 struct page *page, int writable);
  72 #define arch_make_huge_pte arch_make_huge_pte
  73 extern void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  74                             pte_t *ptep, pte_t pte);
  75 extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  76                                       unsigned long addr, pte_t *ptep,
  77                                       pte_t pte, int dirty);
  78 extern pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  79                                      unsigned long addr, pte_t *ptep);
  80 extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
  81                                     unsigned long addr, pte_t *ptep);
  82 extern void huge_ptep_clear_flush(struct vm_area_struct *vma,
  83                                   unsigned long addr, pte_t *ptep);
  84 extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
  85                            pte_t *ptep, unsigned long sz);
  86 #define huge_pte_clear huge_pte_clear
  87 extern void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
  88                                  pte_t *ptep, pte_t pte, unsigned long sz);
  89 #define set_huge_swap_pte_at set_huge_swap_pte_at
  90
  91 #include <asm-generic/hugetlb.h>
  92
  93 #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
  94 static inline bool gigantic_page_supported(void) { return true; }
  95 #endif
  96
  97 #endif /* __ASM_HUGETLB_H */