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
  14static inline int is_hugepage_only_range(struct mm_struct *mm,
  15                                         unsigned long addr,
  16                                         unsigned long len)
  17{
  18        return 0;
  19}
  20
  21#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
  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
  40#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
  41static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  42                                            unsigned long addr, pte_t *ptep)
  43{
  44        pte_t clear;
  45        pte_t pte = *ptep;
  46
  47        pte_val(clear) = (unsigned long)invalid_pte_table;
  48        set_pte_at(mm, addr, ptep, clear);
  49        return pte;
  50}
  51
  52#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
  53static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  54                                         unsigned long addr, pte_t *ptep)
  55{
  56        flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
  57}
  58
  59#define __HAVE_ARCH_HUGE_PTE_NONE
  60static inline int huge_pte_none(pte_t pte)
  61{
  62        unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  63        return !val || (val == (unsigned long)invalid_pte_table);
  64}
  65
  66#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
  67static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  68                                             unsigned long addr,
  69                                             pte_t *ptep, pte_t pte,
  70                                             int dirty)
  71{
  72        int changed = !pte_same(*ptep, pte);
  73
  74        if (changed) {
  75                set_pte_at(vma->vm_mm, addr, ptep, pte);
  76                /*
  77                 * There could be some standard sized pages in there,
  78                 * get them all.
  79                 */
  80                flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
  81        }
  82        return changed;
  83}
  84
  85static inline void arch_clear_hugepage_flags(struct page *page)
  86{
  87}
  88
  89#include <asm-generic/hugetlb.h>
  90
  91#endif /* __ASM_HUGETLB_H */
  92