arch/mn10300/include/asm/pgalloc.h

   1 /* MN10300 Page and page table/directory allocation
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #ifndef _ASM_PGALLOC_H
  12 #define _ASM_PGALLOC_H
  13
  14 #include <asm/page.h>
  15 #include <linux/threads.h>
  16 #include <linux/mm.h>           /* for struct page */
  17
  18 struct mm_struct;
  19 struct page;
  20
  21 /* attach a page table to a PMD entry */
  22 #define pmd_populate_kernel(mm, pmd, pte) \
  23         set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE))
  24
  25 static inline
  26 void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
  27 {
  28         set_pmd(pmd, __pmd((page_to_pfn(pte) << PAGE_SHIFT) | _PAGE_TABLE));
  29 }
  30 #define pmd_pgtable(pmd) pmd_page(pmd)
  31
  32 /*
  33  * Allocate and free page tables.
  34  */
  35
  36 extern pgd_t *pgd_alloc(struct mm_struct *);
  37 extern void pgd_free(struct mm_struct *, pgd_t *);
  38
  39 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  40 extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
  41
  42 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  43 {
  44         free_page((unsigned long) pte);
  45 }
  46
  47 static inline void pte_free(struct mm_struct *mm, struct page *pte)
  48 {
  49         pgtable_page_dtor(pte);
  50         __free_page(pte);
  51 }
  52
  53
  54 #define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
  55
  56 #endif /* _ASM_PGALLOC_H */