include/asm-mips/ioctl.h

/* */
   1 #ifndef __ASM_MIPS_IOCTL_H
   2 #define __ASM_MIPS_IOCTL_H
   3 
   4 /*
   5  * The original linux ioctl numbering scheme was just a general
   6  * "anything goes" setup, where more or less random numbers were
   7  * assigned.  Sorry, I was clueless when I started out on this.
   8  *
   9  * On the alpha, we'll try to clean it up a bit, using a more sane
  10  * ioctl numbering, and also trying to be compatible with OSF/1 in
  11  * the process. I'd like to clean it up for the i386 as well, but
  12  * it's so painful recognizing both the new and the old numbers..
  13  *
  14  * The same applies for for the MIPS ABI; in fact even the macros
  15  * from Linux/Alpha fit almost perfectly.
  16  */
  17 
  18 #define _IOC_NRBITS     8
  19 #define _IOC_TYPEBITS   8
  20 #define _IOC_SIZEBITS   13
  21 #define _IOC_DIRBITS    3
  22 
  23 #define _IOC_NRMASK     ((1 << _IOC_NRBITS)-1)
  24 #define _IOC_TYPEMASK   ((1 << _IOC_TYPEBITS)-1)
  25 #define _IOC_SIZEMASK   ((1 << _IOC_SIZEBITS)-1)
  26 #define _IOC_DIRMASK    ((1 << _IOC_DIRBITS)-1)
  27 
  28 #define _IOC_NRSHIFT    0
  29 #define _IOC_TYPESHIFT  (_IOC_NRSHIFT+_IOC_NRBITS)
  30 #define _IOC_SIZESHIFT  (_IOC_TYPESHIFT+_IOC_TYPEBITS)
  31 #define _IOC_DIRSHIFT   (_IOC_SIZESHIFT+_IOC_SIZEBITS)
  32 
  33 /*
  34  * We to additionally limit parameters to a maximum 255 bytes.
  35  */
  36 #define _IOC_SLMASK     0xff
  37 
  38 /*
  39  * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
  40  * And this turns out useful to catch old ioctl numbers in header
  41  * files for us.
  42  */
  43 #define _IOC_NONE       1U
  44 #define _IOC_READ       2U
  45 #define _IOC_WRITE      4U
  46 
  47 /*
  48  * The following are included for compatibility
  49  */
  50 #define _IOC_VOID       0x20000000
  51 #define _IOC_OUT        0x40000000
  52 #define _IOC_IN         0x80000000
  53 #define _IOC_INOUT      (IOC_IN|IOC_OUT)
  54 
  55 #define _IOC(dir,type,nr,size) \
  56         (((dir)  << _IOC_DIRSHIFT) | \
  57          ((type) << _IOC_TYPESHIFT) | \
  58          ((nr)   << _IOC_NRSHIFT) | \
  59          (((size) & _IOC_SLMASK) << _IOC_SIZESHIFT))
  60 
  61 /* used to create numbers */
  62 #define _IO(type,nr)            _IOC(_IOC_NONE,(type),(nr),0)
  63 #define _IOR(type,nr,size)      _IOC(_IOC_READ,(type),(nr),sizeof(size))
  64 #define _IOW(type,nr,size)      _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
  65 #define _IOWR(type,nr,size)     _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
  66 
  67 /* used to decode them.. */
  68 #define _IOC_DIR(nr)            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
  69 #define _IOC_TYPE(nr)           (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
  70 #define _IOC_NR(nr)             (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
  71 #define _IOC_SIZE(nr)           (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
  72 
  73 /* ...and for the drivers/sound files... */
  74 
  75 #define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
  76 #define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
  77 #define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
  78 #define IOCSIZE_MASK    (_IOC_SIZEMASK << _IOC_SIZESHIFT)
  79 #define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
  80 
  81 #endif /* __ASM_MIPS_IOCTL_H */
/* */
root/include/asm-mips/ioctl.h

INCLUDED FROM
