LXR linux/arch/mips/include/asm/hugetlb.h

   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