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69 lines
2.6 KiB
69 lines
2.6 KiB
20 years ago
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/* $Id: ioctl.h,v 1.6 1999/12/01 23:58:36 davem Exp $ */
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#ifndef _SPARC_IOCTL_H
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#define _SPARC_IOCTL_H
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/*
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* Our DIR and SIZE overlap in order to simulteneously provide
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* a non-zero _IOC_NONE (for binary compatibility) and
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* 14 bits of size as on i386. Here's the layout:
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*
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* 0xE0000000 DIR
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* 0x80000000 DIR = WRITE
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* 0x40000000 DIR = READ
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* 0x20000000 DIR = NONE
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* 0x3FFF0000 SIZE (overlaps NONE bit)
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* 0x0000FF00 TYPE
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* 0x000000FF NR (CMD)
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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 /* Actually 14, see below. */
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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_XSIZEMASK ((1 << (_IOC_SIZEBITS+1))-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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#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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#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 ioctl numbers in drivers despite the leading underscore... */
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#define _IOC_DIR(nr) \
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( (((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) != 0)? \
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(((nr) >> _IOC_DIRSHIFT) & (_IOC_WRITE|_IOC_READ)): \
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(((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) \
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((((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) == 0)? \
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0: (((nr) >> _IOC_SIZESHIFT) & _IOC_XSIZEMASK))
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/* ...and for the PCMCIA and sound. */
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#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
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#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
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#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
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#define IOCSIZE_MASK (_IOC_XSIZEMASK << _IOC_SIZESHIFT)
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#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
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#endif /* !(_SPARC_IOCTL_H) */
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