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  1. /*
  2.  * fixmap.h: compile-time virtual memory allocation
  3.  *
  4.  * This file is subject to the terms and conditions of the GNU General Public
  5.  * License.  See the file "COPYING" in the main directory of this archive
  6.  * for more details.
  7.  *
  8.  * Copyright (C) 1998 Ingo Molnar
  9.  *
  10.  * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
  11.  * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
  12.  * Break out common bits to asm-generic by Mark Salter, November 2013
  13.  */
  14.  
  15. #ifndef __ASM_GENERIC_FIXMAP_H
  16. #define __ASM_GENERIC_FIXMAP_H
  17.  
  18. #include <linux/bug.h>
  19.  
  20. #define __fix_to_virt(x)        (FIXADDR_TOP - ((x) << PAGE_SHIFT))
  21. #define __virt_to_fix(x)        ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
  22.  
  23. #ifndef __ASSEMBLY__
  24. /*
  25.  * 'index to address' translation. If anyone tries to use the idx
  26.  * directly without translation, we catch the bug with a NULL-deference
  27.  * kernel oops. Illegal ranges of incoming indices are caught too.
  28.  */
  29. static __always_inline unsigned long fix_to_virt(const unsigned int idx)
  30. {
  31.         BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
  32.         return __fix_to_virt(idx);
  33. }
  34.  
  35. static inline unsigned long virt_to_fix(const unsigned long vaddr)
  36. {
  37.         BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
  38.         return __virt_to_fix(vaddr);
  39. }
  40.  
  41. /*
  42.  * Provide some reasonable defaults for page flags.
  43.  * Not all architectures use all of these different types and some
  44.  * architectures use different names.
  45.  */
  46. #ifndef FIXMAP_PAGE_NORMAL
  47. #define FIXMAP_PAGE_NORMAL PAGE_KERNEL
  48. #endif
  49. #if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO)
  50. #define FIXMAP_PAGE_RO PAGE_KERNEL_RO
  51. #endif
  52. #ifndef FIXMAP_PAGE_NOCACHE
  53. #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
  54. #endif
  55. #ifndef FIXMAP_PAGE_IO
  56. #define FIXMAP_PAGE_IO PAGE_KERNEL_IO
  57. #endif
  58. #ifndef FIXMAP_PAGE_CLEAR
  59. #define FIXMAP_PAGE_CLEAR __pgprot(0)
  60. #endif
  61.  
  62. #ifndef set_fixmap
  63. #define set_fixmap(idx, phys)                           \
  64.         __set_fixmap(idx, phys, FIXMAP_PAGE_NORMAL)
  65. #endif
  66.  
  67. #ifndef clear_fixmap
  68. #define clear_fixmap(idx)                       \
  69.         __set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR)
  70. #endif
  71.  
  72. /* Return a pointer with offset calculated */
  73. #define __set_fixmap_offset(idx, phys, flags)                           \
  74. ({                                                                      \
  75.         unsigned long ________addr;                                     \
  76.         __set_fixmap(idx, phys, flags);                                 \
  77.         ________addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1));   \
  78.         ________addr;                                                   \
  79. })
  80.  
  81. #define set_fixmap_offset(idx, phys) \
  82.         __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL)
  83.  
  84. /*
  85.  * Some hardware wants to get fixmapped without caching.
  86.  */
  87. #define set_fixmap_nocache(idx, phys) \
  88.         __set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE)
  89.  
  90. #define set_fixmap_offset_nocache(idx, phys) \
  91.         __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE)
  92.  
  93. /*
  94.  * Some fixmaps are for IO
  95.  */
  96. #define set_fixmap_io(idx, phys) \
  97.         __set_fixmap(idx, phys, FIXMAP_PAGE_IO)
  98.  
  99. #define set_fixmap_offset_io(idx, phys) \
  100.         __set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO)
  101.  
  102. #endif /* __ASSEMBLY__ */
  103. #endif /* __ASM_GENERIC_FIXMAP_H */
  104.