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Linux/arch/arm64/include/asm/hugetlb.h

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

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