1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2008, 2009 Cavium Networks, Inc. 7 */ 8 9 #ifndef __ASM_HUGETLB_H 10 #define __ASM_HUGETLB_H 11 12 #include <asm/page.h> 13 #include <asm-generic/hugetlb.h> 14 15 16 static inline int is_hugepage_only_range(struct mm_struct *mm, 17 unsigned long addr, 18 unsigned long len) 19 { 20 return 0; 21 } 22 23 static inline int prepare_hugepage_range(struct file *file, 24 unsigned long addr, 25 unsigned long len) 26 { 27 unsigned long task_size = STACK_TOP; 28 struct hstate *h = hstate_file(file); 29 30 if (len & ~huge_page_mask(h)) 31 return -EINVAL; 32 if (addr & ~huge_page_mask(h)) 33 return -EINVAL; 34 if (len > task_size) 35 return -ENOMEM; 36 if (task_size - len < addr) 37 return -EINVAL; 38 return 0; 39 } 40 41 static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm) 42 { 43 } 44 45 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, 46 unsigned long addr, 47 unsigned long end, 48 unsigned long floor, 49 unsigned long ceiling) 50 { 51 free_pgd_range(tlb, addr, end, floor, ceiling); 52 } 53 54 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 55 pte_t *ptep, pte_t pte) 56 { 57 set_pte_at(mm, addr, ptep, pte); 58 } 59 60 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 61 unsigned long addr, pte_t *ptep) 62 { 63 pte_t clear; 64 pte_t pte = *ptep; 65 66 pte_val(clear) = (unsigned long)invalid_pte_table; 67 set_pte_at(mm, addr, ptep, clear); 68 return pte; 69 } 70 71 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, 72 unsigned long addr, pte_t *ptep) 73 { 74 flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma))); 75 } 76 77 static inline int huge_pte_none(pte_t pte) 78 { 79 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL; 80 return !val || (val == (unsigned long)invalid_pte_table); 81 } 82 83 static inline pte_t huge_pte_wrprotect(pte_t pte) 84 { 85 return pte_wrprotect(pte); 86 } 87 88 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 89 unsigned long addr, pte_t *ptep) 90 { 91 ptep_set_wrprotect(mm, addr, ptep); 92 } 93 94 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 95 unsigned long addr, 96 pte_t *ptep, pte_t pte, 97 int dirty) 98 { 99 int changed = !pte_same(*ptep, pte); 100 101 if (changed) { 102 set_pte_at(vma->vm_mm, addr, ptep, pte); 103 /* 104 * There could be some standard sized pages in there, 105 * get them all. 106 */ 107 flush_tlb_range(vma, addr, addr + HPAGE_SIZE); 108 } 109 return changed; 110 } 111 112 static inline pte_t huge_ptep_get(pte_t *ptep) 113 { 114 return *ptep; 115 } 116 117 static inline int arch_prepare_hugepage(struct page *page) 118 { 119 return 0; 120 } 121 122 static inline void arch_release_hugepage(struct page *page) 123 { 124 } 125 126 static inline void arch_clear_hugepage_flags(struct page *page) 127 { 128 } 129 130 #endif /* __ASM_HUGETLB_H */ 131