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https://github.com/torvalds/linux
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94 lines
3.3 KiB
C
94 lines
3.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995, 96, 99, 2001 Ralf Baechle
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*/
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#ifndef _ASM_IOCTL_H
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#define _ASM_IOCTL_H
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/*
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* The original linux ioctl numbering scheme was just a general
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* "anything goes" setup, where more or less random numbers were
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* assigned. Sorry, I was clueless when I started out on this.
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*
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* On the alpha, we'll try to clean it up a bit, using a more sane
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* ioctl numbering, and also trying to be compatible with OSF/1 in
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* the process. I'd like to clean it up for the i386 as well, but
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* it's so painful recognizing both the new and the old numbers..
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*
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* The same applies for for the MIPS ABI; in fact even the macros
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* from Linux/Alpha fit almost perfectly.
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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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/*
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* The following are included for compatibility
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*/
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#define _IOC_VOID 0x20000000
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#define _IOC_OUT 0x40000000
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#define _IOC_IN 0x80000000
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#define _IOC_INOUT (IOC_IN|IOC_OUT)
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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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/* provoke compile error for invalid uses of size argument */
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extern unsigned int __invalid_size_argument_for_IOC;
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#define _IOC_TYPECHECK(t) \
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((sizeof(t) == sizeof(t[1]) && \
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sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
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sizeof(t) : __invalid_size_argument_for_IOC)
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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), (_IOC_TYPECHECK(size)))
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#define _IOW(type, nr, size) _IOC(_IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(size)))
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#define _IOWR(type, nr, size) _IOC(_IOC_READ|_IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(size)))
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#define _IOR_BAD(type, nr, size) _IOC(_IOC_READ, (type), (nr), sizeof(size))
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#define _IOW_BAD(type, nr, size) _IOC(_IOC_WRITE, (type), (nr), sizeof(size))
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#define _IOWR_BAD(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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/* ...and for the drivers/sound files... */
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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_SIZEMASK << _IOC_SIZESHIFT)
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#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
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#endif /* _ASM_IOCTL_H */
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