Release 4.14 arch/sparc/include/uapi/asm/ioctl.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _SPARC_IOCTL_H

#define _SPARC_IOCTL_H

/*
 * Our DIR and SIZE overlap in order to simulteneously provide
 * a non-zero _IOC_NONE (for binary compatibility) and
 * 14 bits of size as on i386. Here's the layout:
 *
 *   0xE0000000   DIR
 *   0x80000000     DIR = WRITE
 *   0x40000000     DIR = READ
 *   0x20000000     DIR = NONE
 *   0x3FFF0000   SIZE (overlaps NONE bit)
 *   0x0000FF00   TYPE
 *   0x000000FF   NR (CMD)
 */


#define _IOC_NRBITS      8

#define _IOC_TYPEBITS    8

#define _IOC_SIZEBITS   13	
/* Actually 14, see below. */

#define _IOC_DIRBITS     3


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

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

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

#define _IOC_XSIZEMASK   ((1 << (_IOC_SIZEBITS+1))-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)


#define _IOC_NONE        1U

#define _IOC_READ        2U

#define _IOC_WRITE       4U


#define _IOC(dir,type,nr,size) \
        (((dir)  << _IOC_DIRSHIFT) | \
         ((type) << _IOC_TYPESHIFT) | \
         ((nr)   << _IOC_NRSHIFT) | \
         ((size) << _IOC_SIZESHIFT))


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

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

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

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

/* Used to decode ioctl numbers in drivers despite the leading underscore... */

#define _IOC_DIR(nr)    \
 ( (((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) != 0)?   \
                            (((nr) >> _IOC_DIRSHIFT) & (_IOC_WRITE|_IOC_READ)):  \
                            (((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_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) == 0)?    \
                         0: (((nr) >> _IOC_SIZESHIFT) & _IOC_XSIZEMASK))

/* ...and for the PCMCIA and sound. */

#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_XSIZEMASK << _IOC_SIZESHIFT)

#define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)

#endif /* !(_SPARC_IOCTL_H) */
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Directory: arch/sparc/include/uapi/asm

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