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 16static inline int is_hugepage_only_range(struct mm_struct *mm, 17 unsigned long addr, 18 unsigned long len) 19{ 20 return 0; 21} 22 23static 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 41static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm) 42{ 43} 44 45static 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 54static 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 60static 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 71static 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 77static 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 83static inline pte_t huge_pte_wrprotect(pte_t pte) 84{ 85 return pte_wrprotect(pte); 86} 87 88static 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 94static 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 112static inline pte_t huge_ptep_get(pte_t *ptep) 113{ 114 return *ptep; 115} 116 117static inline int arch_prepare_hugepage(struct page *page) 118{ 119 return 0; 120} 121 122static inline void arch_release_hugepage(struct page *page) 123{ 124} 125 126static inline void arch_clear_hugepage_flags(struct page *page) 127{ 128} 129 130#endif /* __ASM_HUGETLB_H */ 131