pgtable-nommu.h 2.8 KB

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  1. /*
  2. * linux/include/asm-arm/pgtable-nommu.h
  3. *
  4. * Copyright (C) 1995-2002 Russell King
  5. * Copyright (C) 2004 Hyok S. Choi
  6. *
  7. * This program is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License version 2 as
  9. * published by the Free Software Foundation.
  10. */
  11. #ifndef _ASMARM_PGTABLE_NOMMU_H
  12. #define _ASMARM_PGTABLE_NOMMU_H
  13. #ifndef __ASSEMBLY__
  14. #include <linux/slab.h>
  15. #include <asm/processor.h>
  16. #include <asm/page.h>
  17. #include <asm/io.h>
  18. /*
  19. * Trivial page table functions.
  20. */
  21. #define pgd_present(pgd) (1)
  22. #define pgd_none(pgd) (0)
  23. #define pgd_bad(pgd) (0)
  24. #define pgd_clear(pgdp)
  25. #define kern_addr_valid(addr) (1)
  26. #define pmd_offset(a, b) ((void *)0)
  27. /* FIXME */
  28. /*
  29. * PMD_SHIFT determines the size of the area a second-level page table can map
  30. * PGDIR_SHIFT determines what a third-level page table entry can map
  31. */
  32. #define PGDIR_SHIFT 21
  33. #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
  34. #define PGDIR_MASK (~(PGDIR_SIZE-1))
  35. /* FIXME */
  36. #define PAGE_NONE __pgprot(0)
  37. #define PAGE_SHARED __pgprot(0)
  38. #define PAGE_COPY __pgprot(0)
  39. #define PAGE_READONLY __pgprot(0)
  40. #define PAGE_KERNEL __pgprot(0)
  41. #define swapper_pg_dir ((pgd_t *) 0)
  42. #define __swp_type(x) (0)
  43. #define __swp_offset(x) (0)
  44. #define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) })
  45. #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  46. #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
  47. typedef pte_t *pte_addr_t;
  48. static inline int pte_file(pte_t pte) { return 0; }
  49. /*
  50. * ZERO_PAGE is a global shared page that is always zero: used
  51. * for zero-mapped memory areas etc..
  52. */
  53. #define ZERO_PAGE(vaddr) (virt_to_page(0))
  54. /*
  55. * Mark the prot value as uncacheable and unbufferable.
  56. */
  57. #define pgprot_noncached(prot) __pgprot(0)
  58. #define pgprot_writecombine(prot) __pgprot(0)
  59. /*
  60. * These would be in other places but having them here reduces the diffs.
  61. */
  62. extern unsigned int kobjsize(const void *objp);
  63. extern int is_in_rom(unsigned long);
  64. /*
  65. * No page table caches to initialise.
  66. */
  67. #define pgtable_cache_init() do { } while (0)
  68. #define io_remap_page_range remap_page_range
  69. #define io_remap_pfn_range remap_pfn_range
  70. #define MK_IOSPACE_PFN(space, pfn) (pfn)
  71. #define GET_IOSPACE(pfn) 0
  72. #define GET_PFN(pfn) (pfn)
  73. /*
  74. * All 32bit addresses are effectively valid for vmalloc...
  75. * Sort of meaningless for non-VM targets.
  76. */
  77. #define VMALLOC_START 0
  78. #define VMALLOC_END 0xffffffff
  79. #define FIRST_USER_ADDRESS (0)
  80. #else
  81. /*
  82. * dummy tlb and user structures.
  83. */
  84. #define v3_tlb_fns (0)
  85. #define v4_tlb_fns (0)
  86. #define v4wb_tlb_fns (0)
  87. #define v4wbi_tlb_fns (0)
  88. #define v6_tlb_fns (0)
  89. #define v3_user_fns (0)
  90. #define v4_user_fns (0)
  91. #define v4_mc_user_fns (0)
  92. #define v4wb_user_fns (0)
  93. #define v4wt_user_fns (0)
  94. #define v6_user_fns (0)
  95. #define xscale_mc_user_fns (0)
  96. #endif /*__ASSEMBLY__*/
  97. #endif /* _ASMARM_PGTABLE_H */