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hugetlb.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2008, 2009 Cavium Networks, Inc.
 */

#ifndef __ASM_HUGETLB_H
#define __ASM_HUGETLB_H

#include <asm/page.h>


static inline int is_hugepage_only_range(struct mm_struct *mm,
                               unsigned long addr,
                               unsigned long len)
{
      return 0;
}

static inline int prepare_hugepage_range(struct file *file,
                               unsigned long addr,
                               unsigned long len)
{
      unsigned long task_size = STACK_TOP;
      struct hstate *h = hstate_file(file);

      if (len & ~huge_page_mask(h))
            return -EINVAL;
      if (addr & ~huge_page_mask(h))
            return -EINVAL;
      if (len > task_size)
            return -ENOMEM;
      if (task_size - len < addr)
            return -EINVAL;
      return 0;
}

static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
{
}

static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
                                unsigned long addr,
                                unsigned long end,
                                unsigned long floor,
                                unsigned long ceiling)
{
      free_pgd_range(tlb, addr, end, floor, ceiling);
}

static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
                           pte_t *ptep, pte_t pte)
{
      set_pte_at(mm, addr, ptep, pte);
}

static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
                                  unsigned long addr, pte_t *ptep)
{
      pte_t clear;
      pte_t pte = *ptep;

      pte_val(clear) = (unsigned long)invalid_pte_table;
      set_pte_at(mm, addr, ptep, clear);
      return pte;
}

static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
                               unsigned long addr, pte_t *ptep)
{
}

static inline int huge_pte_none(pte_t pte)
{
      unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
      return !val || (val == (unsigned long)invalid_pte_table);
}

static inline pte_t huge_pte_wrprotect(pte_t pte)
{
      return pte_wrprotect(pte);
}

static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
                                 unsigned long addr, pte_t *ptep)
{
      ptep_set_wrprotect(mm, addr, ptep);
}

static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
                                   unsigned long addr,
                                   pte_t *ptep, pte_t pte,
                                   int dirty)
{
      return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
}

static inline pte_t huge_ptep_get(pte_t *ptep)
{
      return *ptep;
}

static inline int arch_prepare_hugepage(struct page *page)
{
      return 0;
}

static inline void arch_release_hugepage(struct page *page)
{
}

#endif /* __ASM_HUGETLB_H */

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