include/asm-xtensa/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
  29 static inline pgd_t*
  30 pgd_alloc(struct mm_struct *mm)
  31 {
  32         return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
  33 }
  34
  35 static 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
  42 extern struct kmem_cache *pgtable_cache;
  43
  44 static 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
  50 static 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
  60 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  61 {
  62         kmem_cache_free(pgtable_cache, pte);
  63 }
  64
  65 static 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 */