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

   1/*
   2 * include/asm-xtensa/pgalloc.h
   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 * Copyright (C) 2001-2007 Tensilica Inc.
   9 */
  10
  11#ifndef _XTENSA_PGALLOC_H
  12#define _XTENSA_PGALLOC_H
  13
  14#ifdef __KERNEL__
  15
  16#include <linux/highmem.h>
  17
  18/*
  19 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
  20 * inside the pgd, so has no extra memory associated with it.
  21 */
  22
  23#define pmd_populate_kernel(mm, pmdp, ptep)                                  \
  24        (pmd_val(*(pmdp)) = ((unsigned long)ptep))
  25#define pmd_populate(mm, pmdp, page)                                         \
  26        (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
  27#define pmd_pgtable(pmd) pmd_page(pmd)
  28
  29static inline pgd_t*
  30pgd_alloc(struct mm_struct *mm)
  31{
  32        return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
  33}
  34
  35static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  36{
  37        free_page((unsigned long)pgd);
  38}
  39
  40/* Use a slab cache for the pte pages (see also sparc64 implementation) */
  41
  42extern struct kmem_cache *pgtable_cache;
  43
  44static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 
  45                                         unsigned long address)
  46{
  47        return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT);
  48}
  49
  50static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  51                                        unsigned long addr)
  52{
  53        struct page *page;
  54
  55        page = virt_to_page(pte_alloc_one_kernel(mm, addr));
  56        pgtable_page_ctor(page);
  57        return page;
  58}
  59
  60static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  61{
  62        kmem_cache_free(pgtable_cache, pte);
  63}
  64
  65static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  66{
  67        pgtable_page_dtor(pte);
  68        kmem_cache_free(pgtable_cache, page_address(pte));
  69}
  70#define pmd_pgtable(pmd) pmd_page(pmd)
  71
  72#endif /* __KERNEL__ */
  73#endif /* _XTENSA_PGALLOC_H */
  74