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TOMOYO Linux Cross Reference
Linux/arch/alpha/include/uapi/asm/ioctl.h

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  1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2 #ifndef _ALPHA_IOCTL_H
  3 #define _ALPHA_IOCTL_H
  4 
  5 /*
  6  * The original linux ioctl numbering scheme was just a general
  7  * "anything goes" setup, where more or less random numbers were
  8  * assigned.  Sorry, I was clueless when I started out on this.
  9  *
 10  * On the alpha, we'll try to clean it up a bit, using a more sane
 11  * ioctl numbering, and also trying to be compatible with OSF/1 in
 12  * the process. I'd like to clean it up for the i386 as well, but
 13  * it's so painful recognizing both the new and the old numbers..
 14  */
 15 
 16 #define _IOC_NRBITS     8
 17 #define _IOC_TYPEBITS   8
 18 #define _IOC_SIZEBITS   13
 19 #define _IOC_DIRBITS    3
 20 
 21 #define _IOC_NRMASK     ((1 << _IOC_NRBITS)-1)
 22 #define _IOC_TYPEMASK   ((1 << _IOC_TYPEBITS)-1)
 23 #define _IOC_SIZEMASK   ((1 << _IOC_SIZEBITS)-1)
 24 #define _IOC_DIRMASK    ((1 << _IOC_DIRBITS)-1)
 25 
 26 #define _IOC_NRSHIFT    0
 27 #define _IOC_TYPESHIFT  (_IOC_NRSHIFT+_IOC_NRBITS)
 28 #define _IOC_SIZESHIFT  (_IOC_TYPESHIFT+_IOC_TYPEBITS)
 29 #define _IOC_DIRSHIFT   (_IOC_SIZESHIFT+_IOC_SIZEBITS)
 30 
 31 /*
 32  * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
 33  * And this turns out useful to catch old ioctl numbers in header
 34  * files for us.
 35  */
 36 #define _IOC_NONE       1U
 37 #define _IOC_READ       2U
 38 #define _IOC_WRITE      4U
 39 
 40 #define _IOC(dir,type,nr,size)                  \
 41         ((unsigned int)                         \
 42          (((dir)  << _IOC_DIRSHIFT) |           \
 43           ((type) << _IOC_TYPESHIFT) |          \
 44           ((nr)   << _IOC_NRSHIFT) |            \
 45           ((size) << _IOC_SIZESHIFT)))
 46 
 47 /* used to create numbers */
 48 #define _IO(type,nr)            _IOC(_IOC_NONE,(type),(nr),0)
 49 #define _IOR(type,nr,size)      _IOC(_IOC_READ,(type),(nr),sizeof(size))
 50 #define _IOW(type,nr,size)      _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
 51 #define _IOWR(type,nr,size)     _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
 52 
 53 /* used to decode them.. */
 54 #define _IOC_DIR(nr)            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
 55 #define _IOC_TYPE(nr)           (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
 56 #define _IOC_NR(nr)             (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
 57 #define _IOC_SIZE(nr)           (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
 58 
 59 /* ...and for the drivers/sound files... */
 60 
 61 #define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
 62 #define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
 63 #define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
 64 #define IOCSIZE_MASK    (_IOC_SIZEMASK << _IOC_SIZESHIFT)
 65 #define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
 66 
 67 #endif /* _ALPHA_IOCTL_H */
 68 

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