1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_GENERIC_IOCTL_H
 3#define _ASM_GENERIC_IOCTL_H
 4
 5#include <uapi/asm-generic/ioctl.h>
 
 
 
 
 
 
 
 
 6
 7#ifdef __CHECKER__
 8#define _IOC_TYPECHECK(t) (sizeof(t))
 9#else
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10/* provoke compile error for invalid uses of size argument */
11extern unsigned int __invalid_size_argument_for_IOC;
12#define _IOC_TYPECHECK(t) \
13	((sizeof(t) == sizeof(t[1]) && \
14	  sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
15	  sizeof(t) : __invalid_size_argument_for_IOC)
 
 
16#endif
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
17
18#endif /* _ASM_GENERIC_IOCTL_H */

 
  1#ifndef _ASM_GENERIC_IOCTL_H
  2#define _ASM_GENERIC_IOCTL_H
  3
  4/* ioctl command encoding: 32 bits total, command in lower 16 bits,
  5 * size of the parameter structure in the lower 14 bits of the
  6 * upper 16 bits.
  7 * Encoding the size of the parameter structure in the ioctl request
  8 * is useful for catching programs compiled with old versions
  9 * and to avoid overwriting user space outside the user buffer area.
 10 * The highest 2 bits are reserved for indicating the ``access mode''.
 11 * NOTE: This limits the max parameter size to 16kB -1 !
 12 */
 13
 14/*
 15 * The following is for compatibility across the various Linux
 16 * platforms.  The generic ioctl numbering scheme doesn't really enforce
 17 * a type field.  De facto, however, the top 8 bits of the lower 16
 18 * bits are indeed used as a type field, so we might just as well make
 19 * this explicit here.  Please be sure to use the decoding macros
 20 * below from now on.
 21 */
 22#define _IOC_NRBITS	8
 23#define _IOC_TYPEBITS	8
 24
 25/*
 26 * Let any architecture override either of the following before
 27 * including this file.
 28 */
 29
 30#ifndef _IOC_SIZEBITS
 31# define _IOC_SIZEBITS	14
 32#endif
 33
 34#ifndef _IOC_DIRBITS
 35# define _IOC_DIRBITS	2
 36#endif
 37
 38#define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
 39#define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
 40#define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)
 41#define _IOC_DIRMASK	((1 << _IOC_DIRBITS)-1)
 42
 43#define _IOC_NRSHIFT	0
 44#define _IOC_TYPESHIFT	(_IOC_NRSHIFT+_IOC_NRBITS)
 45#define _IOC_SIZESHIFT	(_IOC_TYPESHIFT+_IOC_TYPEBITS)
 46#define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)
 47
 48/*
 49 * Direction bits, which any architecture can choose to override
 50 * before including this file.
 51 */
 52
 53#ifndef _IOC_NONE
 54# define _IOC_NONE	0U
 55#endif
 56
 57#ifndef _IOC_WRITE
 58# define _IOC_WRITE	1U
 59#endif
 60
 61#ifndef _IOC_READ
 62# define _IOC_READ	2U
 63#endif
 64
 65#define _IOC(dir,type,nr,size) \
 66	(((dir)  << _IOC_DIRSHIFT) | \
 67	 ((type) << _IOC_TYPESHIFT) | \
 68	 ((nr)   << _IOC_NRSHIFT) | \
 69	 ((size) << _IOC_SIZESHIFT))
 70
 71#ifdef __KERNEL__
 72/* provoke compile error for invalid uses of size argument */
 73extern unsigned int __invalid_size_argument_for_IOC;
 74#define _IOC_TYPECHECK(t) \
 75	((sizeof(t) == sizeof(t[1]) && \
 76	  sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
 77	  sizeof(t) : __invalid_size_argument_for_IOC)
 78#else
 79#define _IOC_TYPECHECK(t) (sizeof(t))
 80#endif
 81
 82/* used to create numbers */
 83#define _IO(type,nr)		_IOC(_IOC_NONE,(type),(nr),0)
 84#define _IOR(type,nr,size)	_IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
 85#define _IOW(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
 86#define _IOWR(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
 87#define _IOR_BAD(type,nr,size)	_IOC(_IOC_READ,(type),(nr),sizeof(size))
 88#define _IOW_BAD(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),sizeof(size))
 89#define _IOWR_BAD(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
 90
 91/* used to decode ioctl numbers.. */
 92#define _IOC_DIR(nr)		(((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
 93#define _IOC_TYPE(nr)		(((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
 94#define _IOC_NR(nr)		(((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
 95#define _IOC_SIZE(nr)		(((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
 96
 97/* ...and for the drivers/sound files... */
 98
 99#define IOC_IN		(_IOC_WRITE << _IOC_DIRSHIFT)
100#define IOC_OUT		(_IOC_READ << _IOC_DIRSHIFT)
101#define IOC_INOUT	((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
102#define IOCSIZE_MASK	(_IOC_SIZEMASK << _IOC_SIZESHIFT)
103#define IOCSIZE_SHIFT	(_IOC_SIZESHIFT)
104
105#endif /* _ASM_GENERIC_IOCTL_H */