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  1. #ifndef _UAPI_ASM_GENERIC_IOCTL_H
  2. #define _UAPI_ASM_GENERIC_IOCTL_H
  3.  
  4. /* ioctl command encoding: 32 bits total, command in lower 16 bits,
  5.  * size of the parameter structure in the lower 14 bits of the
  6.  * upper 16 bits.
  7.  * Encoding the size of the parameter structure in the ioctl request
  8.  * is useful for catching programs compiled with old versions
  9.  * and to avoid overwriting user space outside the user buffer area.
  10.  * The highest 2 bits are reserved for indicating the ``access mode''.
  11.  * NOTE: This limits the max parameter size to 16kB -1 !
  12.  */
  13.  
  14. /*
  15.  * The following is for compatibility across the various Linux
  16.  * platforms.  The generic ioctl numbering scheme doesn't really enforce
  17.  * a type field.  De facto, however, the top 8 bits of the lower 16
  18.  * bits are indeed used as a type field, so we might just as well make
  19.  * this explicit here.  Please be sure to use the decoding macros
  20.  * below from now on.
  21.  */
  22. #define _IOC_NRBITS     8
  23. #define _IOC_TYPEBITS   8
  24.  
  25. /*
  26.  * Let any architecture override either of the following before
  27.  * including this file.
  28.  */
  29.  
  30. #ifndef _IOC_SIZEBITS
  31. # define _IOC_SIZEBITS  14
  32. #endif
  33.  
  34. #ifndef _IOC_DIRBITS
  35. # define _IOC_DIRBITS   2
  36. #endif
  37.  
  38. #define _IOC_NRMASK     ((1 << _IOC_NRBITS)-1)
  39. #define _IOC_TYPEMASK   ((1 << _IOC_TYPEBITS)-1)
  40. #define _IOC_SIZEMASK   ((1 << _IOC_SIZEBITS)-1)
  41. #define _IOC_DIRMASK    ((1 << _IOC_DIRBITS)-1)
  42.  
  43. #define _IOC_NRSHIFT    0
  44. #define _IOC_TYPESHIFT  (_IOC_NRSHIFT+_IOC_NRBITS)
  45. #define _IOC_SIZESHIFT  (_IOC_TYPESHIFT+_IOC_TYPEBITS)
  46. #define _IOC_DIRSHIFT   (_IOC_SIZESHIFT+_IOC_SIZEBITS)
  47.  
  48. /*
  49.  * Direction bits, which any architecture can choose to override
  50.  * before including this file.
  51.  */
  52.  
  53. #ifndef _IOC_NONE
  54. # define _IOC_NONE      0U
  55. #endif
  56.  
  57. #ifndef _IOC_WRITE
  58. # define _IOC_WRITE     1U
  59. #endif
  60.  
  61. #ifndef _IOC_READ
  62. # define _IOC_READ      2U
  63. #endif
  64.  
  65. #define _IOC(dir,type,nr,size) \
  66.         (((dir)  << _IOC_DIRSHIFT) | \
  67.          ((type) << _IOC_TYPESHIFT) | \
  68.          ((nr)   << _IOC_NRSHIFT) | \
  69.          ((size) << _IOC_SIZESHIFT))
  70.  
  71. #ifndef __KERNEL__
  72. #define _IOC_TYPECHECK(t) (sizeof(t))
  73. #endif
  74.  
  75. /* used to create numbers */
  76. #define _IO(type,nr)            _IOC(_IOC_NONE,(type),(nr),0)
  77. #define _IOR(type,nr,size)      _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
  78. #define _IOW(type,nr,size)      _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
  79. #define _IOWR(type,nr,size)     _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
  80. #define _IOR_BAD(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
  81. #define _IOW_BAD(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
  82. #define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
  83.  
  84. /* used to decode ioctl numbers.. */
  85. #define _IOC_DIR(nr)            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
  86. #define _IOC_TYPE(nr)           (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
  87. #define _IOC_NR(nr)             (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
  88. #define _IOC_SIZE(nr)           (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
  89.  
  90. /* ...and for the drivers/sound files... */
  91.  
  92. #define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
  93. #define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
  94. #define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
  95. #define IOCSIZE_MASK    (_IOC_SIZEMASK << _IOC_SIZESHIFT)
  96. #define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
  97.  
  98. #endif /* _UAPI_ASM_GENERIC_IOCTL_H */
  99.