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 14 15 static inline int is_hugepage_only_range(struct mm_struct *mm, 16 unsigned long addr, 17 unsigned long len) 18 { 19 return 0; 20 } 21 22 static inline int prepare_hugepage_range(struct file *file, 23 unsigned long addr, 24 unsigned long len) 25 { 26 unsigned long task_size = STACK_TOP; 27 struct hstate *h = hstate_file(file); 28 29 if (len & ~huge_page_mask(h)) 30 return -EINVAL; 31 if (addr & ~huge_page_mask(h)) 32 return -EINVAL; 33 if (len > task_size) 34 return -ENOMEM; 35 if (task_size - len < addr) 36 return -EINVAL; 37 return 0; 38 } 39 40 static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm) 41 { 42 } 43 44 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, 45 unsigned long addr, 46 unsigned long end, 47 unsigned long floor, 48 unsigned long ceiling) 49 { 50 free_pgd_range(tlb, addr, end, floor, ceiling); 51 } 52 53 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, 54 pte_t *ptep, pte_t pte) 55 { 56 set_pte_at(mm, addr, ptep, pte); 57 } 58 59 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 60 unsigned long addr, pte_t *ptep) 61 { 62 pte_t clear; 63 pte_t pte = *ptep; 64 65 pte_val(clear) = (unsigned long)invalid_pte_table; 66 set_pte_at(mm, addr, ptep, clear); 67 return pte; 68 } 69 70 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, 71 unsigned long addr, pte_t *ptep) 72 { 73 } 74 75 static inline int huge_pte_none(pte_t pte) 76 { 77 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL; 78 return !val || (val == (unsigned long)invalid_pte_table); 79 } 80 81 static inline pte_t huge_pte_wrprotect(pte_t pte) 82 { 83 return pte_wrprotect(pte); 84 } 85 86 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 87 unsigned long addr, pte_t *ptep) 88 { 89 ptep_set_wrprotect(mm, addr, ptep); 90 } 91 92 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 93 unsigned long addr, 94 pte_t *ptep, pte_t pte, 95 int dirty) 96 { 97 return ptep_set_access_flags(vma, addr, ptep, pte, dirty); 98 } 99 100 static inline pte_t huge_ptep_get(pte_t *ptep) 101 { 102 return *ptep; 103 } 104 105 static inline int arch_prepare_hugepage(struct page *page) 106 { 107 return 0; 108 } 109 110 static inline void arch_release_hugepage(struct page *page) 111 { 112 } 113 114 #endif /* __ASM_HUGETLB_H */ 115