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#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
  15static inline int prepare_hugepage_range(struct file *file,
  16                                         unsigned long addr,
  17                                         unsigned long len)
  18{
  19        unsigned long task_size = STACK_TOP;
  20        struct hstate *h = hstate_file(file);
  21
  22        if (len & ~huge_page_mask(h))
  23                return -EINVAL;
  24        if (addr & ~huge_page_mask(h))
  25                return -EINVAL;
  26        if (len > task_size)
  27                return -ENOMEM;
  28        if (task_size - len < addr)
  29                return -EINVAL;
  30        return 0;
  31}
  32
  33#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
  34static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
  35                                            unsigned long addr, pte_t *ptep)
  36{
  37        pte_t clear;
  38        pte_t pte = *ptep;
  39
  40        pte_val(clear) = (unsigned long)invalid_pte_table;
  41        set_pte_at(mm, addr, ptep, clear);
  42        return pte;
  43}
  44
  45#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
  46static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  47                                         unsigned long addr, pte_t *ptep)
  48{
  49        /*
  50         * clear the huge pte entry firstly, so that the other smp threads will
  51         * not get old pte entry after finishing flush_tlb_page and before
  52         * setting new huge pte entry
  53         */
  54        huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
  55        flush_tlb_page(vma, addr);
  56}
  57
  58#define __HAVE_ARCH_HUGE_PTE_NONE
  59static inline int huge_pte_none(pte_t pte)
  60{
  61        unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  62        return !val || (val == (unsigned long)invalid_pte_table);
  63}
  64
  65#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
  66static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  67                                             unsigned long addr,
  68                                             pte_t *ptep, pte_t pte,
  69                                             int dirty)
  70{
  71        int changed = !pte_same(*ptep, pte);
  72
  73        if (changed) {
  74                set_pte_at(vma->vm_mm, addr, ptep, pte);
  75                /*
  76                 * There could be some standard sized pages in there,
  77                 * get them all.
  78                 */
  79                flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
  80        }
  81        return changed;
  82}
  83
  84#include <asm-generic/hugetlb.h>
  85
  86#endif /* __ASM_HUGETLB_H */
  87