Subversion Repositories hf-risc

#ifndef _ASM_GENERIC_IOCTL_H

#define _ASM_GENERIC_IOCTL_H

/* ioctl command encoding: 32 bits total, command in lower 16 bits,

 * size of the parameter structure in the lower 14 bits of the

 * upper 16 bits.

 * Encoding the size of the parameter structure in the ioctl request

 * is useful for catching programs compiled with old versions

 * and to avoid overwriting user space outside the user buffer area.

 * The highest 2 bits are reserved for indicating the ``access mode''.

 * NOTE: This limits the max parameter size to 16kB -1 !

 */

/*

 * The following is for compatibility across the various Linux

 * platforms.  The generic ioctl numbering scheme doesn't really enforce

 * a type field.  De facto, however, the top 8 bits of the lower 16

 * bits are indeed used as a type field, so we might just as well make

 * this explicit here.  Please be sure to use the decoding macros

 * below from now on.

 */

#define _IOC_NRBITS     8

#define _IOC_TYPEBITS   8

/*

 * Let any architecture override either of the following before

 * including this file.

 */

#ifndef _IOC_SIZEBITS

# define _IOC_SIZEBITS  14

#endif

#ifndef _IOC_DIRBITS

# define _IOC_DIRBITS   2

#endif

#define _IOC_NRMASK     ((1 << _IOC_NRBITS)-1)

#define _IOC_TYPEMASK   ((1 << _IOC_TYPEBITS)-1)

#define _IOC_SIZEMASK   ((1 << _IOC_SIZEBITS)-1)

#define _IOC_DIRMASK    ((1 << _IOC_DIRBITS)-1)

#define _IOC_NRSHIFT    0

#define _IOC_TYPESHIFT  (_IOC_NRSHIFT+_IOC_NRBITS)

#define _IOC_SIZESHIFT  (_IOC_TYPESHIFT+_IOC_TYPEBITS)

#define _IOC_DIRSHIFT   (_IOC_SIZESHIFT+_IOC_SIZEBITS)

/*

 * Direction bits, which any architecture can choose to override

 * before including this file.

 */

#ifndef _IOC_NONE

# define _IOC_NONE      0U

#endif

#ifndef _IOC_WRITE

# define _IOC_WRITE     1U

#endif

#ifndef _IOC_READ

# define _IOC_READ      2U

#endif

#define _IOC(dir,type,nr,size) \

        (((dir)  << _IOC_DIRSHIFT) | \

         ((type) << _IOC_TYPESHIFT) | \

         ((nr)   << _IOC_NRSHIFT) | \

         ((size) << _IOC_SIZESHIFT))

#define _IOC_TYPECHECK(t) (sizeof(t))

/* used to create numbers */

#define _IO(type,nr)            _IOC(_IOC_NONE,(type),(nr),0)

#define _IOR(type,nr,size)      _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))

#define _IOW(type,nr,size)      _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))

#define _IOWR(type,nr,size)     _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))

#define _IOR_BAD(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))

#define _IOW_BAD(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))

#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))

/* used to decode ioctl numbers.. */

#define _IOC_DIR(nr)            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)

#define _IOC_TYPE(nr)           (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)

#define _IOC_NR(nr)             (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)

#define _IOC_SIZE(nr)           (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)

/* ...and for the drivers/sound files... */

#define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)

#define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)

#define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)

#define IOCSIZE_MASK    (_IOC_SIZEMASK << _IOC_SIZESHIFT)

#define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)

#endif /* _ASM_GENERIC_IOCTL_H */