diff options
Diffstat (limited to 'include/asm-generic/ioctl.h')
| -rw-r--r-- | include/asm-generic/ioctl.h | 95 | 
1 files changed, 1 insertions, 94 deletions
diff --git a/include/asm-generic/ioctl.h b/include/asm-generic/ioctl.h index 15828b2d663..d17295b290f 100644 --- a/include/asm-generic/ioctl.h +++ b/include/asm-generic/ioctl.h @@ -1,105 +1,12 @@  #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 ! - */ +#include <uapi/asm-generic/ioctl.h> -/* - * 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)) - -#ifdef __KERNEL__  /* provoke compile error for invalid uses of size argument */  extern unsigned int __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) -#else -#define _IOC_TYPECHECK(t) (sizeof(t)) -#endif - -/* 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 */  |