#ifndef _ALPHA_IOCTL_H#define _ALPHA_IOCTL_H /* * The original linux ioctl numbering scheme was just a general * "anything goes" setup, where more or less random numbers were * assigned.  Sorry, I was clueless when I started out on this. * * On the alpha, we'll try to clean it up a bit, using a more sane * ioctl numbering, and also trying to be compatible with OSF/1 in * the process. I'd like to clean it up for the i386 as well, but * it's so painful recognizing both the new and the old numbers.. */ #define _IOC_NRBITS	8#define _IOC_TYPEBITS	8#define _IOC_SIZEBITS	13#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_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 _IOC_NONE could be 0, but OSF/1 gives it a bit. * And this turns out useful to catch old ioctl numbers in header * files for us. */#define _IOC_NONE	1U#define _IOC_READ	2U#define _IOC_WRITE	4U #define _IOC(dir,type,nr,size)			\	((unsigned int)				\	 (((dir)  << _IOC_DIRSHIFT) |		\	  ((type) << _IOC_TYPESHIFT) |		\	  ((nr)   << _IOC_NRSHIFT) |		\	  ((size) << _IOC_SIZESHIFT))) /* used to create numbers */#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 them.. */#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 /* _ALPHA_IOCTL_H */