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