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 static 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
  22 static 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
  41 static 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
  53 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
  54                                          unsigned long addr, pte_t *ptep)
  55 {
  56         /*
  57          * clear the huge pte entry firstly, so that the other smp threads will
  58          * not get old pte entry after finishing flush_tlb_page and before
  59          * setting new huge pte entry
  60          */
  61         huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
  62         flush_tlb_page(vma, addr);
  63 }
  64
  65 #define __HAVE_ARCH_HUGE_PTE_NONE
  66 static inline int huge_pte_none(pte_t pte)
  67 {
  68         unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  69         return !val || (val == (unsigned long)invalid_pte_table);
  70 }
  71
  72 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
  73 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  74                                              unsigned long addr,
  75                                              pte_t *ptep, pte_t pte,
  76                                              int dirty)
  77 {
  78         int changed = !pte_same(*ptep, pte);
  79
  80         if (changed) {
  81                 set_pte_at(vma->vm_mm, addr, ptep, pte);
  82                 /*
  83                  * There could be some standard sized pages in there,
  84                  * get them all.
  85                  */
  86                 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
  87         }
  88         return changed;
  89 }
  90
  91 static inline void arch_clear_hugepage_flags(struct page *page)
  92 {
  93 }
  94
  95 #include <asm-generic/hugetlb.h>
  96
  97 #endif /* __ASM_HUGETLB_H */