[net-next-2.6.git] / include / asm-s390 / ioctl.h

/*
 *  include/asm-s390/ioctl.h
 *
 *  S390 version
 *
 *  Derived from "include/asm-i386/ioctl.h"
 */

#ifndef _S390_IOCTL_H
#define _S390_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 i386 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
#define _IOC_SIZEBITS	14
#define _IOC_DIRBITS	2

#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.
 */
#define _IOC_NONE	0U
#define _IOC_WRITE	1U
#define _IOC_READ	2U

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

/* provoke compile error for invalid uses of size argument */
extern unsigned long __invalid_size_argument_for_IOC;
#define _IOC_TYPECHECK(t) \
	((sizeof(t) == sizeof(t[1]) && \
	  sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
	  sizeof(t) : __invalid_size_argument_for_IOC)

/* 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 /* _S390_IOCTL_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/asm-s390/ioctl.h
	3	*
	4	* S390 version
	5	*
	6	* Derived from "include/asm-i386/ioctl.h"
	7	*/
	8
	9	#ifndef _S390_IOCTL_H
	10	#define _S390_IOCTL_H
	11
	12	/* ioctl command encoding: 32 bits total, command in lower 16 bits,
	13	* size of the parameter structure in the lower 14 bits of the
	14	* upper 16 bits.
	15	* Encoding the size of the parameter structure in the ioctl request
	16	* is useful for catching programs compiled with old versions
	17	* and to avoid overwriting user space outside the user buffer area.
	18	* The highest 2 bits are reserved for indicating the ``access mode''.
	19	* NOTE: This limits the max parameter size to 16kB -1 !
	20	*/
	21
	22	/*
	23	* The following is for compatibility across the various Linux
	24	* platforms. The i386 ioctl numbering scheme doesn't really enforce
	25	* a type field. De facto, however, the top 8 bits of the lower 16
	26	* bits are indeed used as a type field, so we might just as well make
	27	* this explicit here. Please be sure to use the decoding macros
	28	* below from now on.
	29	*/
	30	#define _IOC_NRBITS 8
	31	#define _IOC_TYPEBITS 8
	32	#define _IOC_SIZEBITS 14
	33	#define _IOC_DIRBITS 2
	34
	35	#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
	36	#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
	37	#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
	38	#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
	39
	40	#define _IOC_NRSHIFT 0
	41	#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
	42	#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
	43	#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
	44
	45	/*
	46	* Direction bits.
	47	*/
	48	#define _IOC_NONE 0U
	49	#define _IOC_WRITE 1U
	50	#define _IOC_READ 2U
	51
	52	#define _IOC(dir,type,nr,size) \
	53	(((dir) << _IOC_DIRSHIFT) \| \
	54	((type) << _IOC_TYPESHIFT) \| \
	55	((nr) << _IOC_NRSHIFT) \| \
	56	((size) << _IOC_SIZESHIFT))
	57
	58	/* provoke compile error for invalid uses of size argument */
	59	extern unsigned long __invalid_size_argument_for_IOC;
	60	#define _IOC_TYPECHECK(t) \
	61	((sizeof(t) == sizeof(t[1]) && \
	62	sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
	63	sizeof(t) : __invalid_size_argument_for_IOC)
	64
65	/* used to create numbers */
66	#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
67	#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
68	#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
69	#define _IOWR(type,nr,size) _IOC(_IOC_READ\|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
70	#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
71	#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
72	#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ\|_IOC_WRITE,(type),(nr),sizeof(size))
73
74	/* used to decode ioctl numbers.. */
75	#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
76	#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
77	#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
78	#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
79
80	/* ...and for the drivers/sound files... */
81
82	#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
83	#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
84	#define IOC_INOUT ((_IOC_WRITE\|_IOC_READ) << _IOC_DIRSHIFT)
85	#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
86	#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
87
88	#endif /* _S390_IOCTL_H */