sun3_pgalloc.h 2.2 KB

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  1. /* sun3_pgalloc.h --
  2. * reorganization around 2.3.39, routines moved from sun3_pgtable.h
  3. *
  4. *
  5. * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
  6. *
  7. * moved 1/26/2000 Sam Creasey
  8. */
  9. #ifndef _SUN3_PGALLOC_H
  10. #define _SUN3_PGALLOC_H
  11. #include <asm/tlb.h>
  12. extern const char bad_pmd_string[];
  13. #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
  14. static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  15. {
  16. free_page((unsigned long) pte);
  17. }
  18. static inline void pte_free(struct mm_struct *mm, pgtable_t page)
  19. {
  20. pgtable_page_dtor(page);
  21. __free_page(page);
  22. }
  23. #define __pte_free_tlb(tlb,pte,addr) \
  24. do { \
  25. pgtable_page_dtor(pte); \
  26. tlb_remove_page((tlb), pte); \
  27. } while (0)
  28. static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  29. unsigned long address)
  30. {
  31. unsigned long page = __get_free_page(GFP_KERNEL);
  32. if (!page)
  33. return NULL;
  34. memset((void *)page, 0, PAGE_SIZE);
  35. return (pte_t *) (page);
  36. }
  37. static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  38. unsigned long address)
  39. {
  40. struct page *page = alloc_pages(GFP_KERNEL, 0);
  41. if (page == NULL)
  42. return NULL;
  43. clear_highpage(page);
  44. if (!pgtable_page_ctor(page)) {
  45. __free_page(page);
  46. return NULL;
  47. }
  48. return page;
  49. }
  50. static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  51. {
  52. pmd_val(*pmd) = __pa((unsigned long)pte);
  53. }
  54. static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
  55. {
  56. pmd_val(*pmd) = __pa((unsigned long)page_address(page));
  57. }
  58. #define pmd_pgtable(pmd) pmd_page(pmd)
  59. /*
  60. * allocating and freeing a pmd is trivial: the 1-entry pmd is
  61. * inside the pgd, so has no extra memory associated with it.
  62. */
  63. #define pmd_free(mm, x) do { } while (0)
  64. #define __pmd_free_tlb(tlb, x, addr) do { } while (0)
  65. static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  66. {
  67. free_page((unsigned long) pgd);
  68. }
  69. static inline pgd_t * pgd_alloc(struct mm_struct *mm)
  70. {
  71. pgd_t *new_pgd;
  72. new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  73. memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  74. memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
  75. return new_pgd;
  76. }
  77. #define pgd_populate(mm, pmd, pte) BUG()
  78. #endif /* SUN3_PGALLOC_H */