LXR linux/arch/frv/include/asm/pgalloc.h

   1/* pgalloc.h: Page allocation routines for FRV
   2 *
   3 * Copyright (C) 2004 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 License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 *
  11 * Derived from:
  12 *      include/asm-m68knommu/pgalloc.h
  13 *      include/asm-i386/pgalloc.h
  14 */
  15#ifndef _ASM_PGALLOC_H
  16#define _ASM_PGALLOC_H
  17
  18#include <asm/setup.h>
  19#include <asm/virtconvert.h>
  20
  21#ifdef CONFIG_MMU
  22
  23#define pmd_populate_kernel(mm, pmd, pte) __set_pmd(pmd, __pa(pte) | _PAGE_TABLE)
  24#define pmd_populate(MM, PMD, PAGE)                                             \
  25do {                                                                            \
  26        __set_pmd((PMD), page_to_pfn(PAGE) << PAGE_SHIFT | _PAGE_TABLE);        \
  27} while(0)
  28#define pmd_pgtable(pmd) pmd_page(pmd)
  29
  30/*
  31 * Allocate and free page tables.
  32 */
  33
  34extern pgd_t *pgd_alloc(struct mm_struct *);
  35extern void pgd_free(struct mm_struct *mm, pgd_t *);
  36
  37extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  38
  39extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
  40
  41static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  42{
  43        free_page((unsigned long)pte);
  44}
  45
  46static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  47{
  48        pgtable_page_dtor(pte);
  49        __free_page(pte);
  50}
  51
  52#define __pte_free_tlb(tlb,pte,address)                 \
  53do {                                                    \
  54        pgtable_page_dtor(pte);                         \
  55        tlb_remove_page((tlb),(pte));                   \
  56} while (0)
  57
  58/*
  59 * allocating and freeing a pmd is trivial: the 1-entry pmd is
  60 * inside the pgd, so has no extra memory associated with it.
  61 * (In the PAE case we free the pmds as part of the pgd.)
  62 */
  63#define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *) 2); })
  64#define pmd_free(mm, x)                 do { } while (0)
  65#define __pmd_free_tlb(tlb,x,a)         do { } while (0)
  66
  67#endif /* CONFIG_MMU */
  68
  69#endif /* _ASM_PGALLOC_H */
  70