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_free_pgd_range(struct mmu_gather *tlb,
  42                                          unsigned long addr,
  43                                          unsigned long end,
  44                                          unsigned long floor,
  45                                          unsigned long ceiling)
  46{
  47        free_pgd_range(tlb, addr, end, floor, ceiling);
  48}
  49
  50static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  51                                   pte_t *ptep, pte_t pte)
  52{
  53        set_pte_at(mm, addr, ptep, pte);
  54}
  55
  56static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  57                                            unsigned long addr, pte_t *ptep)
  58{
  59        pte_t clear;
  60        pte_t pte = *ptep;
  61
  62        pte_val(clear) = (unsigned long)invalid_pte_table;
  63        set_pte_at(mm, addr, ptep, clear);
  64        return pte;
  65}
  66
  67static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  68                                         unsigned long addr, pte_t *ptep)
  69{
  70        flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
  71}
  72
  73static inline int huge_pte_none(pte_t pte)
  74{
  75        unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  76        return !val || (val == (unsigned long)invalid_pte_table);
  77}
  78
  79static inline pte_t huge_pte_wrprotect(pte_t pte)
  80{
  81        return pte_wrprotect(pte);
  82}
  83
  84static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  85                                           unsigned long addr, pte_t *ptep)
  86{
  87        ptep_set_wrprotect(mm, addr, ptep);
  88}
  89
  90static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  91                                             unsigned long addr,
  92                                             pte_t *ptep, pte_t pte,
  93                                             int dirty)
  94{
  95        int changed = !pte_same(*ptep, pte);
  96
  97        if (changed) {
  98                set_pte_at(vma->vm_mm, addr, ptep, pte);
  99                /*
 100                 * There could be some standard sized pages in there,
 101                 * get them all.
 102                 */
 103                flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
 104        }
 105        return changed;
 106}
 107
 108static inline pte_t huge_ptep_get(pte_t *ptep)
 109{
 110        return *ptep;
 111}
 112
 113static inline void arch_clear_hugepage_flags(struct page *page)
 114{
 115}
 116
 117#endif /* __ASM_HUGETLB_H */
 118