arch/arc/include/asm/hugepage.h

   1 /*
   2  * Copyright (C) 2013-15 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9
  10 #ifndef _ASM_ARC_HUGEPAGE_H
  11 #define _ASM_ARC_HUGEPAGE_H
  12
  13 #include <linux/types.h>
  14 #include <asm-generic/pgtable-nopmd.h>
  15
  16 static inline pte_t pmd_pte(pmd_t pmd)
  17 {
  18         return __pte(pmd_val(pmd));
  19 }
  20
  21 static inline pmd_t pte_pmd(pte_t pte)
  22 {
  23         return __pmd(pte_val(pte));
  24 }
  25
  26 #define pmd_wrprotect(pmd)      pte_pmd(pte_wrprotect(pmd_pte(pmd)))
  27 #define pmd_mkwrite(pmd)        pte_pmd(pte_mkwrite(pmd_pte(pmd)))
  28 #define pmd_mkdirty(pmd)        pte_pmd(pte_mkdirty(pmd_pte(pmd)))
  29 #define pmd_mkold(pmd)          pte_pmd(pte_mkold(pmd_pte(pmd)))
  30 #define pmd_mkyoung(pmd)        pte_pmd(pte_mkyoung(pmd_pte(pmd)))
  31 #define pmd_mkhuge(pmd)         pte_pmd(pte_mkhuge(pmd_pte(pmd)))
  32 #define pmd_mknotpresent(pmd)   pte_pmd(pte_mknotpresent(pmd_pte(pmd)))
  33 #define pmd_mksplitting(pmd)    pte_pmd(pte_mkspecial(pmd_pte(pmd)))
  34 #define pmd_mkclean(pmd)        pte_pmd(pte_mkclean(pmd_pte(pmd)))
  35
  36 #define pmd_write(pmd)          pte_write(pmd_pte(pmd))
  37 #define pmd_young(pmd)          pte_young(pmd_pte(pmd))
  38 #define pmd_pfn(pmd)            pte_pfn(pmd_pte(pmd))
  39 #define pmd_dirty(pmd)          pte_dirty(pmd_pte(pmd))
  40 #define pmd_special(pmd)        pte_special(pmd_pte(pmd))
  41
  42 #define mk_pmd(page, prot)      pte_pmd(mk_pte(page, prot))
  43
  44 #define pmd_trans_huge(pmd)     (pmd_val(pmd) & _PAGE_HW_SZ)
  45 #define pmd_trans_splitting(pmd)        (pmd_trans_huge(pmd) && pmd_special(pmd))
  46
  47 #define pfn_pmd(pfn, prot)      (__pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)))
  48
  49 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
  50 {
  51         /*
  52          * open-coded pte_modify() with additional retaining of HW_SZ bit
  53          * so that pmd_trans_huge() remains true for this PMD
  54          */
  55         return __pmd((pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HW_SZ)) | pgprot_val(newprot));
  56 }
  57
  58 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
  59                               pmd_t *pmdp, pmd_t pmd)
  60 {
  61         *pmdp = pmd;
  62 }
  63
  64 extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
  65                                  pmd_t *pmd);
  66
  67 #define has_transparent_hugepage() 1
  68
  69 /* Generic variants assume pgtable_t is struct page *, hence need for these */
  70 #define __HAVE_ARCH_PGTABLE_DEPOSIT
  71 extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
  72                                        pgtable_t pgtable);
  73
  74 #define __HAVE_ARCH_PGTABLE_WITHDRAW
  75 extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
  76
  77 #define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
  78 extern void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,
  79                                 unsigned long end);
  80
  81 #endif