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_free_pgd_range(struct mmu_gather *tlb, 42 unsigned long addr, 43 unsigned long end, 44 unsigned long floor, 45 unsigned long ceiling) 46 { 47 free_pgd_range(tlb, addr, end, floor, ceiling); 48 } 49 50 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 51 pte_t *ptep, pte_t pte) 52 { 53 set_pte_at(mm, addr, ptep, pte); 54 } 55 56 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 57 unsigned long addr, pte_t *ptep) 58 { 59 pte_t clear; 60 pte_t pte = *ptep; 61 62 pte_val(clear) = (unsigned long)invalid_pte_table; 63 set_pte_at(mm, addr, ptep, clear); 64 return pte; 65 } 66 67 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, 68 unsigned long addr, pte_t *ptep) 69 { 70 flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma))); 71 } 72 73 static inline int huge_pte_none(pte_t pte) 74 { 75 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL; 76 return !val || (val == (unsigned long)invalid_pte_table); 77 } 78 79 static inline pte_t huge_pte_wrprotect(pte_t pte) 80 { 81 return pte_wrprotect(pte); 82 } 83 84 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 85 unsigned long addr, pte_t *ptep) 86 { 87 ptep_set_wrprotect(mm, addr, ptep); 88 } 89 90 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 91 unsigned long addr, 92 pte_t *ptep, pte_t pte, 93 int dirty) 94 { 95 int changed = !pte_same(*ptep, pte); 96 97 if (changed) { 98 set_pte_at(vma->vm_mm, addr, ptep, pte); 99 /* 100 * There could be some standard sized pages in there, 101 * get them all. 102 */ 103 flush_tlb_range(vma, addr, addr + HPAGE_SIZE); 104 } 105 return changed; 106 } 107 108 static inline pte_t huge_ptep_get(pte_t *ptep) 109 { 110 return *ptep; 111 } 112 113 static inline void arch_clear_hugepage_flags(struct page *page) 114 { 115 } 116 117 #endif /* __ASM_HUGETLB_H */ 118