page.h 2.9 KB

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  1. /*
  2. * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  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. #ifndef __ASM_ARC_PAGE_H
  9. #define __ASM_ARC_PAGE_H
  10. #include <uapi/asm/page.h>
  11. #ifndef __ASSEMBLY__
  12. #define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
  13. #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
  14. struct vm_area_struct;
  15. struct page;
  16. #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  17. void copy_user_highpage(struct page *to, struct page *from,
  18. unsigned long u_vaddr, struct vm_area_struct *vma);
  19. void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  20. #undef STRICT_MM_TYPECHECKS
  21. #ifdef STRICT_MM_TYPECHECKS
  22. /*
  23. * These are used to make use of C type-checking..
  24. */
  25. typedef struct {
  26. #ifdef CONFIG_ARC_HAS_PAE40
  27. unsigned long long pte;
  28. #else
  29. unsigned long pte;
  30. #endif
  31. } pte_t;
  32. typedef struct {
  33. unsigned long pgd;
  34. } pgd_t;
  35. typedef struct {
  36. unsigned long pgprot;
  37. } pgprot_t;
  38. #define pte_val(x) ((x).pte)
  39. #define pgd_val(x) ((x).pgd)
  40. #define pgprot_val(x) ((x).pgprot)
  41. #define __pte(x) ((pte_t) { (x) })
  42. #define __pgd(x) ((pgd_t) { (x) })
  43. #define __pgprot(x) ((pgprot_t) { (x) })
  44. #define pte_pgprot(x) __pgprot(pte_val(x))
  45. #else /* !STRICT_MM_TYPECHECKS */
  46. #ifdef CONFIG_ARC_HAS_PAE40
  47. typedef unsigned long long pte_t;
  48. #else
  49. typedef unsigned long pte_t;
  50. #endif
  51. typedef unsigned long pgd_t;
  52. typedef unsigned long pgprot_t;
  53. #define pte_val(x) (x)
  54. #define pgd_val(x) (x)
  55. #define pgprot_val(x) (x)
  56. #define __pte(x) (x)
  57. #define __pgd(x) (x)
  58. #define __pgprot(x) (x)
  59. #define pte_pgprot(x) (x)
  60. #endif
  61. typedef pte_t * pgtable_t;
  62. /*
  63. * Use virt_to_pfn with caution:
  64. * If used in pte or paddr related macros, it could cause truncation
  65. * in PAE40 builds
  66. * As a rule of thumb, only use it in helpers starting with virt_
  67. * You have been warned !
  68. */
  69. #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
  70. #define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
  71. #ifdef CONFIG_FLATMEM
  72. #define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  73. #endif
  74. /*
  75. * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
  76. *
  77. * These macros have historically been misnamed
  78. * virt here means link-address/program-address as embedded in object code.
  79. * And for ARC, link-addr = physical address
  80. */
  81. #define __pa(vaddr) ((unsigned long)(vaddr))
  82. #define __va(paddr) ((void *)((unsigned long)(paddr)))
  83. #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
  84. #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
  85. /* Default Permissions for stack/heaps pages (Non Executable) */
  86. #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  87. #define WANT_PAGE_VIRTUAL 1
  88. #include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
  89. #include <asm-generic/getorder.h>
  90. #endif /* !__ASSEMBLY__ */
  91. #endif