pgalloc.h 1.8 KB

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