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-generic/hugetlb.h> 22 #include <asm/page.h> 23 24 static inline pte_t huge_ptep_get(pte_t *ptep) 25 { 26 return *ptep; 27 } 28 29 30 31 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, 32 unsigned long addr, unsigned long end, 33 unsigned long floor, 34 unsigned long ceiling) 35 { 36 free_pgd_range(tlb, addr, end, floor, ceiling); 37 } 38 39 static inline int is_hugepage_only_range(struct mm_struct *mm, 40 unsigned long addr, unsigned long len) 41 { 42 return 0; 43 } 44 45 static inline int prepare_hugepage_range(struct file *file, 46 unsigned long addr, unsigned long len) 47 { 48 struct hstate *h = hstate_file(file); 49 if (len & ~huge_page_mask(h)) 50 return -EINVAL; 51 if (addr & ~huge_page_mask(h)) 52 return -EINVAL; 53 return 0; 54 } 55 56 static inline int huge_pte_none(pte_t pte) 57 { 58 return pte_none(pte); 59 } 60 61 static inline pte_t huge_pte_wrprotect(pte_t pte) 62 { 63 return pte_wrprotect(pte); 64 } 65 66 static inline void arch_clear_hugepage_flags(struct page *page) 67 { 68 clear_bit(PG_dcache_clean, &page->flags); 69 } 70 71 extern pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, 72 struct page *page, int writable); 73 #define arch_make_huge_pte arch_make_huge_pte 74 extern void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 75 pte_t *ptep, pte_t pte); 76 extern int huge_ptep_set_access_flags(struct vm_area_struct *vma, 77 unsigned long addr, pte_t *ptep, 78 pte_t pte, int dirty); 79 extern pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 80 unsigned long addr, pte_t *ptep); 81 extern void huge_ptep_set_wrprotect(struct mm_struct *mm, 82 unsigned long addr, pte_t *ptep); 83 extern void huge_ptep_clear_flush(struct vm_area_struct *vma, 84 unsigned long addr, pte_t *ptep); 85 86 #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE 87 static inline bool gigantic_page_supported(void) { return true; } 88 #endif 89 90 #endif /* __ASM_HUGETLB_H */ 91