release/src-rt-6.x.4708/linux/linux-2.6.36/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)                                             \
  25 do {                                                                            \
  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
  34 extern pgd_t *pgd_alloc(struct mm_struct *);
  35 extern void pgd_free(struct mm_struct *mm, pgd_t *);
  36
  37 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  38
  39 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
  40
  41 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  42 {
  43         free_page((unsigned long)pte);
  44 }
  45
  46 static 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)                 \
  53 do {                                                    \
  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 */