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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-ppc/] [ioctl.h] - Blame information for rev 1765

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1 1633 jcastillo
#ifndef _PPC_IOCTL_H
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#define _PPC_IOCTL_H
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/*
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 * this was copied from the alpha as it's a bit cleaner there.
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 *                         -- Cort
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 */
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#define _IOC_NRBITS     8
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#define _IOC_TYPEBITS   8
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#define _IOC_SIZEBITS   13
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#define _IOC_DIRBITS    3
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#define _IOC_NRMASK     ((1 << _IOC_NRBITS)-1)
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#define _IOC_TYPEMASK   ((1 << _IOC_TYPEBITS)-1)
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#define _IOC_SIZEMASK   ((1 << _IOC_SIZEBITS)-1)
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#define _IOC_DIRMASK    ((1 << _IOC_DIRBITS)-1)
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#define _IOC_NRSHIFT    0
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#define _IOC_TYPESHIFT  (_IOC_NRSHIFT+_IOC_NRBITS)
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#define _IOC_SIZESHIFT  (_IOC_TYPESHIFT+_IOC_TYPEBITS)
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#define _IOC_DIRSHIFT   (_IOC_SIZESHIFT+_IOC_SIZEBITS)
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/*
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 * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
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 * And this turns out useful to catch old ioctl numbers in header
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 * files for us.
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 */
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#define _IOC_NONE       1U
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#define _IOC_READ       2U
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#define _IOC_WRITE      4U
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#define _IOC(dir,type,nr,size) \
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        (((dir)  << _IOC_DIRSHIFT) | \
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         ((type) << _IOC_TYPESHIFT) | \
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         ((nr)   << _IOC_NRSHIFT) | \
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         ((size) << _IOC_SIZESHIFT))
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/* used to create numbers */
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#define _IO(type,nr)            _IOC(_IOC_NONE,(type),(nr),0)
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#define _IOR(type,nr,size)      _IOC(_IOC_READ,(type),(nr),sizeof(size))
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#define _IOW(type,nr,size)      _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
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#define _IOWR(type,nr,size)     _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
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/* used to decode them.. */
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#define _IOC_DIR(nr)            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
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#define _IOC_TYPE(nr)           (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
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#define _IOC_NR(nr)             (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
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#define _IOC_SIZE(nr)           (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
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#endif

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