LXR linux/arch/nios2/include/asm/pgalloc.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) 1994 - 2001, 2003 by Ralf Baechle
   7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
   8 */
   9
  10#ifndef _ASM_NIOS2_PGALLOC_H
  11#define _ASM_NIOS2_PGALLOC_H
  12
  13#include <linux/mm.h>
  14
  15static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  16        pte_t *pte)
  17{
  18        set_pmd(pmd, __pmd((unsigned long)pte));
  19}
  20
  21static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  22        pgtable_t pte)
  23{
  24        set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  25}
  26#define pmd_pgtable(pmd) pmd_page(pmd)
  27
  28/*
  29 * Initialize a new pmd table with invalid pointers.
  30 */
  31extern void pmd_init(unsigned long page, unsigned long pagetable);
  32
  33extern pgd_t *pgd_alloc(struct mm_struct *mm);
  34
  35static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  36{
  37        free_pages((unsigned long)pgd, PGD_ORDER);
  38}
  39
  40static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  41        unsigned long address)
  42{
  43        pte_t *pte;
  44
  45        pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_ZERO, PTE_ORDER);
  46
  47        return pte;
  48}
  49
  50static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  51        unsigned long address)
  52{
  53        struct page *pte;
  54
  55        pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
  56        if (pte) {
  57                if (!pgtable_page_ctor(pte)) {
  58                        __free_page(pte);
  59                        return NULL;
  60                }
  61                clear_highpage(pte);
  62        }
  63        return pte;
  64}
  65
  66static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  67{
  68        free_pages((unsigned long)pte, PTE_ORDER);
  69}
  70
  71static inline void pte_free(struct mm_struct *mm, struct page *pte)
  72{
  73        pgtable_page_dtor(pte);
  74        __free_pages(pte, PTE_ORDER);
  75}
  76
  77#define __pte_free_tlb(tlb, pte, addr)                          \
  78        do {                                                    \
  79                pgtable_page_dtor(pte);                         \
  80                tlb_remove_page((tlb), (pte));                  \
  81        } while (0)
  82
  83#define check_pgt_cache()       do { } while (0)
  84
  85#endif /* _ASM_NIOS2_PGALLOC_H */
  86