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         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
  34 static 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
  46 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
  47                                           unsigned long addr, pte_t *ptep)
  48 {
  49         pte_t pte;
  50
  51         /*
  52          * clear the huge pte entry firstly, so that the other smp threads will
  53          * not get old pte entry after finishing flush_tlb_page and before
  54          * setting new huge pte entry
  55          */
  56         pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
  57         flush_tlb_page(vma, addr);
  58         return pte;
  59 }
  60
  61 #define __HAVE_ARCH_HUGE_PTE_NONE
  62 static inline int huge_pte_none(pte_t pte)
  63 {
  64         unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
  65         return !val || (val == (unsigned long)invalid_pte_table);
  66 }
  67
  68 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
  69 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
  70                                              unsigned long addr,
  71                                              pte_t *ptep, pte_t pte,
  72                                              int dirty)
  73 {
  74         int changed = !pte_same(*ptep, pte);
  75
  76         if (changed) {
  77                 set_pte_at(vma->vm_mm, addr, ptep, pte);
  78                 /*
  79                  * There could be some standard sized pages in there,
  80                  * get them all.
  81                  */
  82                 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
  83         }
  84         return changed;
  85 }
  86
  87 #include <asm-generic/hugetlb.h>
  88
  89 #endif /* __ASM_HUGETLB_H */