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_free_pgd_range(struct mmu_gather *tlb,
  44                                          unsigned long addr, unsigned long end,
  45                                          unsigned long floor,
  46                                          unsigned long ceiling)
  47{
  48        free_pgd_range(tlb, addr, end, floor, ceiling);
  49}
  50
  51static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  52                                   pte_t *ptep, pte_t pte)
  53{
  54        set_pte(ptep, pte);
  55}
  56
  57static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  58                                            unsigned long addr, pte_t *ptep)
  59{
  60        return ptep_get_and_clear(mm, addr, ptep);
  61}
  62
  63static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  64                                         unsigned long addr, pte_t *ptep)
  65{
  66        ptep_clear_flush(vma, addr, ptep);
  67}
  68
  69static inline int huge_pte_none(pte_t pte)
  70{
  71        return pte_none(pte);
  72}
  73
  74static inline pte_t huge_pte_wrprotect(pte_t pte)
  75{
  76        return pte_wrprotect(pte);
  77}
  78
  79static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  80                                           unsigned long addr, pte_t *ptep)
  81{
  82        ptep_set_wrprotect(mm, addr, ptep);
  83}
  84
  85static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  86                                             unsigned long addr, pte_t *ptep,
  87                                             pte_t pte, int dirty)
  88{
  89        return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
  90}
  91
  92static inline pte_t huge_ptep_get(pte_t *ptep)
  93{
  94        return *ptep;
  95}
  96
  97static inline void arch_clear_hugepage_flags(struct page *page)
  98{
  99}
 100
 101#ifdef CONFIG_HUGETLB_SUPER_PAGES
 102static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 103                                       struct page *page, int writable)
 104{
 105        size_t pagesize = huge_page_size(hstate_vma(vma));
 106        if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
 107                entry = pte_mksuper(entry);
 108        return entry;
 109}
 110#define arch_make_huge_pte arch_make_huge_pte
 111
 112/* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
 113enum {
 114        HUGE_SHIFT_PGDIR = 0,
 115        HUGE_SHIFT_PMD = 1,
 116        HUGE_SHIFT_PAGE = 2,
 117        HUGE_SHIFT_ENTRIES
 118};
 119extern int huge_shift[HUGE_SHIFT_ENTRIES];
 120#endif
 121
 122#endif /* _ASM_TILE_HUGETLB_H */
 123