| 1 | /* $Id: ioctl.h,v 1.1.1.1 2003/07/02 13:56:58 eleph Exp $
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| 2 | *
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| 3 | * linux/ioctl.h for Linux by H.H. Bergman.
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| 4 | */
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| 5 |
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| 6 | #ifndef _ASMI386_IOCTL_H
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| 7 | #define _ASMI386_IOCTL_H
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| 8 |
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| 9 | /* ioctl command encoding: 32 bits total, command in lower 16 bits,
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| 10 | * size of the parameter structure in the lower 14 bits of the
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| 11 | * upper 16 bits.
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| 12 | * Encoding the size of the parameter structure in the ioctl request
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| 13 | * is useful for catching programs compiled with old versions
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| 14 | * and to avoid overwriting user space outside the user buffer area.
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| 15 | * The highest 2 bits are reserved for indicating the ``access mode''.
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| 16 | * NOTE: This limits the max parameter size to 16kB -1 !
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| 17 | */
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| 18 |
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| 19 | /*
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| 20 | * The following is for compatibility across the various Linux
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| 21 | * platforms. The i386 ioctl numbering scheme doesn't really enforce
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| 22 | * a type field. De facto, however, the top 8 bits of the lower 16
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| 23 | * bits are indeed used as a type field, so we might just as well make
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| 24 | * this explicit here. Please be sure to use the decoding macros
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| 25 | * below from now on.
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| 26 | */
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| 27 | #define _IOC_NRBITS 8
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| 28 | #define _IOC_TYPEBITS 8
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| 29 | #define _IOC_SIZEBITS 14
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| 30 | #define _IOC_DIRBITS 2
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| 31 |
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| 32 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
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| 33 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
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| 34 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
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| 35 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
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| 36 |
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| 37 | #define _IOC_NRSHIFT 0
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| 38 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
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| 39 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
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| 40 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
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| 41 |
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| 42 | /*
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| 43 | * Direction bits.
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| 44 | */
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| 45 | #define _IOC_NONE 0U
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| 46 | #define _IOC_WRITE 1U
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| 47 | #define _IOC_READ 2U
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| 48 |
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| 49 | #define _IOC(dir,type,nr,size) \
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| 50 | (((dir) << _IOC_DIRSHIFT) | \
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| 51 | ((type) << _IOC_TYPESHIFT) | \
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| 52 | ((nr) << _IOC_NRSHIFT) | \
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| 53 | ((size) << _IOC_SIZESHIFT))
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| 54 |
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| 55 | /* used to create numbers */
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| 56 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
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| 57 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
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| 58 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
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| 59 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
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| 60 |
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| 61 | /* used to decode ioctl numbers.. */
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| 62 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
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| 63 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
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| 64 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
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| 65 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
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| 66 |
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| 67 | /* ...and for the drivers/sound files... */
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| 68 |
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| 69 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
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| 70 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
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| 71 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
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| 72 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
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| 73 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
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| 74 |
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| 75 | #endif /* _ASMI386_IOCTL_H */
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