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 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
  24 #define arch_hugetlb_migration_supported arch_hugetlb_migration_supported
  25 extern bool arch_hugetlb_migration_supported(struct hstate *h);
  26 #endif
  27
  28 #define __HAVE_ARCH_HUGE_PTEP_GET
  29 static inline pte_t huge_ptep_get(pte_t *ptep)
  30 {
  31         return READ_ONCE(*ptep);
  32 }
  33
  34 static inline int is_hugepage_only_range(struct mm_struct *mm,
  35                                          unsigned long addr, unsigned long len)
  36 {
  37         return 0;
  38 }
  39
  40 static inline void arch_clear_hugepage_flags(struct page *page)
  41 {
  42         clear_bit(PG_dcache_clean, &page->flags);
  43 }
  44
  45 extern pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
  46                                 struct page *page, int writable);
  47 #define arch_make_huge_pte arch_make_huge_pte
  48 #define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
  49 extern void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  50                             pte_t *ptep, pte_t pte);
  51 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
  52 extern 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 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
  56 extern pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  57                                      unsigned long addr, pte_t *ptep);
  58 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
  59 extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
  60                                     unsigned long addr, pte_t *ptep);
  61 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
  62 extern void huge_ptep_clear_flush(struct vm_area_struct *vma,
  63                                   unsigned long addr, pte_t *ptep);
  64 #define __HAVE_ARCH_HUGE_PTE_CLEAR
  65 extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
  66                            pte_t *ptep, unsigned long sz);
  67 extern void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
  68                                  pte_t *ptep, pte_t pte, unsigned long sz);
  69 #define set_huge_swap_pte_at set_huge_swap_pte_at
  70
  71 #include <asm-generic/hugetlb.h>
  72
  73 #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
  74 static inline bool gigantic_page_supported(void) { return true; }
  75 #endif
  76
  77 #endif /* __ASM_HUGETLB_H */