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
  14
  15static inline int is_hugepage_only_range(struct mm_struct *mm,
  16                                         unsigned long addr,
  17                                         unsigned long len)
  18{
  19        return 0;
  20}
  21
  22static inline int prepare_hugepage_range(struct file *file,
  23                                         unsigned long addr,
  24                                         unsigned long len)
  25{
  26        unsigned long task_size = STACK_TOP;
  27        struct hstate *h = hstate_file(file);
  28
  29        if (len & ~huge_page_mask(h))
  30                return -EINVAL;
  31        if (addr & ~huge_page_mask(h))
  32                return -EINVAL;
  33        if (len > task_size)
  34                return -ENOMEM;
  35        if (task_size - len < addr)
  36                return -EINVAL;
  37        return 0;
  38}
  39
  40static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
  41{
  42}
  43
  44static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
  45                                          unsigned long addr,
  46                                          unsigned long end,
  47                                          unsigned long floor,
  48                                          unsigned long ceiling)
  49{
  50        free_pgd_range(tlb, addr, end, floor, ceiling);
  51}
  52
  53static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  54                                   pte_t *ptep, pte_t pte)
  55{
  56        set_pte_at(mm, addr, ptep, pte);
  57}
  58
  59static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  60                                            unsigned long addr, pte_t *ptep)
  61{
  62        pte_t clear;
  63        pte_t pte = *ptep;
  64
  65        pte_val(clear) = (unsigned long)invalid_pte_table;
  66        set_pte_at(mm, addr, ptep, clear);
  67        return pte;
  68}
  69
  70static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  71                                         unsigned long addr, pte_t *ptep)
  72{
  73        flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
  74}
  75
  76static inline int huge_pte_none(pte_t pte)
  77{
  78        unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  79        return !val || (val == (unsigned long)invalid_pte_table);
  80}
  81
  82static inline pte_t huge_pte_wrprotect(pte_t pte)
  83{
  84        return pte_wrprotect(pte);
  85}
  86
  87static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
  88                                           unsigned long addr, pte_t *ptep)
  89{
  90        ptep_set_wrprotect(mm, addr, ptep);
  91}
  92
  93static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  94                                             unsigned long addr,
  95                                             pte_t *ptep, pte_t pte,
  96                                             int dirty)
  97{
  98        return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
  99}
 100
 101static inline pte_t huge_ptep_get(pte_t *ptep)
 102{
 103        return *ptep;
 104}
 105
 106static inline int arch_prepare_hugepage(struct page *page)
 107{
 108        return 0;
 109}
 110
 111static inline void arch_release_hugepage(struct page *page)
 112{
 113}
 114
 115#endif /* __ASM_HUGETLB_H */
 116