page.h 3.2 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /*
  3. * Copyright (C) 2000 - 2003 Jeff Dike ([email protected])
  4. * Copyright 2003 PathScale, Inc.
  5. */
  6. #ifndef __UM_PAGE_H
  7. #define __UM_PAGE_H
  8. #include <linux/const.h>
  9. /* PAGE_SHIFT determines the page size */
  10. #define PAGE_SHIFT 12
  11. #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
  12. #define PAGE_MASK (~(PAGE_SIZE-1))
  13. #ifndef __ASSEMBLY__
  14. struct page;
  15. #include <linux/pfn.h>
  16. #include <linux/types.h>
  17. #include <asm/vm-flags.h>
  18. /*
  19. * These are used to make use of C type-checking..
  20. */
  21. #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
  22. #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  23. #define clear_user_page(page, vaddr, pg) clear_page(page)
  24. #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
  25. #if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
  26. typedef struct { unsigned long pte; } pte_t;
  27. typedef struct { unsigned long pmd; } pmd_t;
  28. typedef struct { unsigned long pgd; } pgd_t;
  29. #define pte_val(p) ((p).pte)
  30. #define pte_get_bits(p, bits) ((p).pte & (bits))
  31. #define pte_set_bits(p, bits) ((p).pte |= (bits))
  32. #define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
  33. #define pte_copy(to, from) ({ (to).pte = (from).pte; })
  34. #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
  35. #define pte_set_val(p, phys, prot) \
  36. ({ (p).pte = (phys) | pgprot_val(prot); })
  37. #define pmd_val(x) ((x).pmd)
  38. #define __pmd(x) ((pmd_t) { (x) } )
  39. typedef unsigned long long phys_t;
  40. #else
  41. typedef struct { unsigned long pte; } pte_t;
  42. typedef struct { unsigned long pgd; } pgd_t;
  43. #ifdef CONFIG_3_LEVEL_PGTABLES
  44. typedef struct { unsigned long pmd; } pmd_t;
  45. #define pmd_val(x) ((x).pmd)
  46. #define __pmd(x) ((pmd_t) { (x) } )
  47. #endif
  48. #define pte_val(x) ((x).pte)
  49. #define pte_get_bits(p, bits) ((p).pte & (bits))
  50. #define pte_set_bits(p, bits) ((p).pte |= (bits))
  51. #define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
  52. #define pte_copy(to, from) ((to).pte = (from).pte)
  53. #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
  54. #define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
  55. typedef unsigned long phys_t;
  56. #endif
  57. typedef struct { unsigned long pgprot; } pgprot_t;
  58. typedef struct page *pgtable_t;
  59. #define pgd_val(x) ((x).pgd)
  60. #define pgprot_val(x) ((x).pgprot)
  61. #define __pte(x) ((pte_t) { (x) } )
  62. #define __pgd(x) ((pgd_t) { (x) } )
  63. #define __pgprot(x) ((pgprot_t) { (x) } )
  64. extern unsigned long uml_physmem;
  65. #define PAGE_OFFSET (uml_physmem)
  66. #define KERNELBASE PAGE_OFFSET
  67. #define __va_space (8*1024*1024)
  68. #include <mem.h>
  69. /* Cast to unsigned long before casting to void * to avoid a warning from
  70. * mmap_kmem about cutting a long long down to a void *. Not sure that
  71. * casting is the right thing, but 32-bit UML can't have 64-bit virtual
  72. * addresses
  73. */
  74. #define __pa(virt) uml_to_phys((void *) (unsigned long) (virt))
  75. #define __va(phys) uml_to_virt((unsigned long) (phys))
  76. #define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
  77. #define pfn_to_phys(pfn) PFN_PHYS(pfn)
  78. #define pfn_valid(pfn) ((pfn) < max_mapnr)
  79. #define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
  80. #include <asm-generic/memory_model.h>
  81. #include <asm-generic/getorder.h>
  82. #endif /* __ASSEMBLY__ */
  83. #ifdef CONFIG_X86_32
  84. #define __HAVE_ARCH_GATE_AREA 1
  85. #endif
  86. #endif /* __UM_PAGE_H */