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#include <asm-generic/hugetlb.h>
  20
  21
  22static inline int is_hugepage_only_range(struct mm_struct *mm,
  23                                         unsigned long addr,
  24                                         unsigned long len) {
  25        return 0;
  26}
  27
  28/*
  29 * If the arch doesn't supply something else, assume that hugepage
  30 * size aligned regions are ok without further preparation.
  31 */
  32static inline int prepare_hugepage_range(struct file *file,
  33                                         unsigned long addr, unsigned long len)
  34{
  35        struct hstate *h = hstate_file(file);
  36        if (len & ~huge_page_mask(h))
  37                return -EINVAL;
  38        if (addr & ~huge_page_mask(h))
  39                return -EINVAL;
  40        return 0;
  41}
  42
  43static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
  44{
  45}
  46
  47static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
  48                                          unsigned long addr, unsigned long end,
  49                                          unsigned long floor,
  50                                          unsigned long ceiling)
  51{
  52        free_pgd_range(tlb, addr, end, floor, ceiling);
  53}
  54
  55static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  56                                   pte_t *ptep, pte_t pte)
  57{
  58        set_pte(ptep, pte);
  59}
  60
  61static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  62                                            unsigned long addr, pte_t *ptep)
  63{
  64        return ptep_get_and_clear(mm, addr, ptep);
  65}
  66
  67static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  68                                         unsigned long addr, pte_t *ptep)
  69{
  70        ptep_clear_flush(vma, addr, ptep);
  71}
  72
  73static inline int huge_pte_none(pte_t pte)
  74{
  75        return pte_none(pte);
  76}
  77
  78static inline pte_t huge_pte_wrprotect(pte_t pte)
  79{
  80        return pte_wrprotect(pte);
  81}
  82
  83static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  84                                           unsigned long addr, pte_t *ptep)
  85{
  86        ptep_set_wrprotect(mm, addr, ptep);
  87}
  88
  89static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  90                                             unsigned long addr, pte_t *ptep,
  91                                             pte_t pte, int dirty)
  92{
  93        return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
  94}
  95
  96static inline pte_t huge_ptep_get(pte_t *ptep)
  97{
  98        return *ptep;
  99}
 100
 101static inline int arch_prepare_hugepage(struct page *page)
 102{
 103        return 0;
 104}
 105
 106static inline void arch_release_hugepage(struct page *page)
 107{
 108}
 109
 110static inline void arch_clear_hugepage_flags(struct page *page)
 111{
 112}
 113
 114#ifdef CONFIG_HUGETLB_SUPER_PAGES
 115static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 116                                       struct page *page, int writable)
 117{
 118        size_t pagesize = huge_page_size(hstate_vma(vma));
 119        if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
 120                entry = pte_mksuper(entry);
 121        return entry;
 122}
 123#define arch_make_huge_pte arch_make_huge_pte
 124
 125/* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
 126enum {
 127        HUGE_SHIFT_PGDIR = 0,
 128        HUGE_SHIFT_PMD = 1,
 129        HUGE_SHIFT_PAGE = 2,
 130        HUGE_SHIFT_ENTRIES
 131};
 132extern int huge_shift[HUGE_SHIFT_ENTRIES];
 133#endif
 134
 135#endif /* _ASM_TILE_HUGETLB_H */
 136