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

   1/*
   2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3 *
   4 *   This program is free software; you can redistribute it and/or
   5 *   modify it under the terms of the GNU General Public License
   6 *   as published by the Free Software Foundation, version 2.
   7 *
   8 *   This program is distributed in the hope that it will be useful, but
   9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11 *   NON INFRINGEMENT.  See the GNU General Public License for
  12 *   more details.
  13 */
  14
  15#ifndef _ASM_TILE_HUGETLB_H
  16#define _ASM_TILE_HUGETLB_H
  17
  18#include <asm/page.h>
  19
  20
  21static inline int is_hugepage_only_range(struct mm_struct *mm,
  22                                         unsigned long addr,
  23                                         unsigned long len) {
  24        return 0;
  25}
  26
  27/*
  28 * If the arch doesn't supply something else, assume that hugepage
  29 * size aligned regions are ok without further preparation.
  30 */
  31static inline int prepare_hugepage_range(struct file *file,
  32                                         unsigned long addr, unsigned long len)
  33{
  34        struct hstate *h = hstate_file(file);
  35        if (len & ~huge_page_mask(h))
  36                return -EINVAL;
  37        if (addr & ~huge_page_mask(h))
  38                return -EINVAL;
  39        return 0;
  40}
  41
  42static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
  43{
  44}
  45
  46static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
  47                                          unsigned long addr, 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(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        return ptep_get_and_clear(mm, addr, ptep);
  64}
  65
  66static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  67                                         unsigned long addr, pte_t *ptep)
  68{
  69        ptep_clear_flush(vma, addr, ptep);
  70}
  71
  72static inline int huge_pte_none(pte_t pte)
  73{
  74        return pte_none(pte);
  75}
  76
  77static inline pte_t huge_pte_wrprotect(pte_t pte)
  78{
  79        return pte_wrprotect(pte);
  80}
  81
  82static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  83                                           unsigned long addr, pte_t *ptep)
  84{
  85        ptep_set_wrprotect(mm, addr, ptep);
  86}
  87
  88static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  89                                             unsigned long addr, pte_t *ptep,
  90                                             pte_t pte, int dirty)
  91{
  92        return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
  93}
  94
  95static inline pte_t huge_ptep_get(pte_t *ptep)
  96{
  97        return *ptep;
  98}
  99
 100static inline int arch_prepare_hugepage(struct page *page)
 101{
 102        return 0;
 103}
 104
 105static inline void arch_release_hugepage(struct page *page)
 106{
 107}
 108
 109static inline void arch_clear_hugepage_flags(struct page *page)
 110{
 111}
 112
 113#ifdef CONFIG_HUGETLB_SUPER_PAGES
 114static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 115                                       struct page *page, int writable)
 116{
 117        size_t pagesize = huge_page_size(hstate_vma(vma));
 118        if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
 119                entry = pte_mksuper(entry);
 120        return entry;
 121}
 122#define arch_make_huge_pte arch_make_huge_pte
 123
 124/* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
 125enum {
 126        HUGE_SHIFT_PGDIR = 0,
 127        HUGE_SHIFT_PMD = 1,
 128        HUGE_SHIFT_PAGE = 2,
 129        HUGE_SHIFT_ENTRIES
 130};
 131extern int huge_shift[HUGE_SHIFT_ENTRIES];
 132#endif
 133
 134#endif /* _ASM_TILE_HUGETLB_H */
 135