pgtable-32.c 2.1 KB

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  1. /*
  2. * This file is subject to the terms and conditions of the GNU General Public
  3. * License. See the file "COPYING" in the main directory of this archive
  4. * for more details.
  5. *
  6. * Copyright (C) 2003 by Ralf Baechle
  7. */
  8. #include <linux/init.h>
  9. #include <linux/mm.h>
  10. #include <linux/memblock.h>
  11. #include <linux/highmem.h>
  12. #include <asm/fixmap.h>
  13. #include <asm/pgalloc.h>
  14. #include <asm/tlbflush.h>
  15. void pgd_init(unsigned long page)
  16. {
  17. unsigned long *p = (unsigned long *) page;
  18. int i;
  19. for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
  20. p[i + 0] = (unsigned long) invalid_pte_table;
  21. p[i + 1] = (unsigned long) invalid_pte_table;
  22. p[i + 2] = (unsigned long) invalid_pte_table;
  23. p[i + 3] = (unsigned long) invalid_pte_table;
  24. p[i + 4] = (unsigned long) invalid_pte_table;
  25. p[i + 5] = (unsigned long) invalid_pte_table;
  26. p[i + 6] = (unsigned long) invalid_pte_table;
  27. p[i + 7] = (unsigned long) invalid_pte_table;
  28. }
  29. }
  30. #if defined(CONFIG_TRANSPARENT_HUGEPAGE)
  31. pmd_t mk_pmd(struct page *page, pgprot_t prot)
  32. {
  33. pmd_t pmd;
  34. pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
  35. return pmd;
  36. }
  37. void set_pmd_at(struct mm_struct *mm, unsigned long addr,
  38. pmd_t *pmdp, pmd_t pmd)
  39. {
  40. *pmdp = pmd;
  41. }
  42. #endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
  43. void __init pagetable_init(void)
  44. {
  45. unsigned long vaddr;
  46. pgd_t *pgd_base;
  47. #ifdef CONFIG_HIGHMEM
  48. pgd_t *pgd;
  49. p4d_t *p4d;
  50. pud_t *pud;
  51. pmd_t *pmd;
  52. pte_t *pte;
  53. #endif
  54. /* Initialize the entire pgd. */
  55. pgd_init((unsigned long)swapper_pg_dir);
  56. pgd_init((unsigned long)swapper_pg_dir
  57. + sizeof(pgd_t) * USER_PTRS_PER_PGD);
  58. pgd_base = swapper_pg_dir;
  59. /*
  60. * Fixed mappings:
  61. */
  62. vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
  63. fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
  64. #ifdef CONFIG_HIGHMEM
  65. /*
  66. * Permanent kmaps:
  67. */
  68. vaddr = PKMAP_BASE;
  69. fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
  70. pgd = swapper_pg_dir + pgd_index(vaddr);
  71. p4d = p4d_offset(pgd, vaddr);
  72. pud = pud_offset(p4d, vaddr);
  73. pmd = pmd_offset(pud, vaddr);
  74. pte = pte_offset_kernel(pmd, vaddr);
  75. pkmap_page_table = pte;
  76. #endif
  77. }