1#ifndef _ASM_GENERIC_IOCTL_H
2#define _ASM_GENERIC_IOCTL_H
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22#define _IOC_NRBITS 8
23#define _IOC_TYPEBITS 8
24#define _IOC_SIZEBITS 14
25#define _IOC_DIRBITS 2
26
27#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
28#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
29#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
30#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
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32#define _IOC_NRSHIFT 0
33#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
34#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
35#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
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39
40#define _IOC_NONE 0U
41#define _IOC_WRITE 1U
42#define _IOC_READ 2U
43
44#define _IOC(dir,type,nr,size) \
45 (((dir) << _IOC_DIRSHIFT) | \
46 ((type) << _IOC_TYPESHIFT) | \
47 ((nr) << _IOC_NRSHIFT) | \
48 ((size) << _IOC_SIZESHIFT))
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50
51extern unsigned int __invalid_size_argument_for_IOC;
52#define _IOC_TYPECHECK(t) \
53 ((sizeof(t) == sizeof(t[1]) && \
54 sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
55 sizeof(t) : __invalid_size_argument_for_IOC)
56
57
58#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
59#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
60#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
61#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
62#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
63#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
64#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
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66
67#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
68#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
69#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
70#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
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74#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
75#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
76#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
77#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
78#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
79
80#endif
81