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- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1995, 96, 99, 2001 Ralf Baechle
- */
- #ifndef _ASM_IOCTL_H
- #define _ASM_IOCTL_H
- /*
- * The original linux ioctl numbering scheme was just a general
- * "anything goes" setup, where more or less random numbers were
- * assigned. Sorry, I was clueless when I started out on this.
- *
- * On the alpha, we'll try to clean it up a bit, using a more sane
- * ioctl numbering, and also trying to be compatible with OSF/1 in
- * the process. I'd like to clean it up for the i386 as well, but
- * it's so painful recognizing both the new and the old numbers..
- *
- * The same applies for for the MIPS ABI; in fact even the macros
- * from Linux/Alpha fit almost perfectly.
- */
- #define _IOC_NRBITS 8
- #define _IOC_TYPEBITS 8
- #define _IOC_SIZEBITS 13
- #define _IOC_DIRBITS 3
- #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
- #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
- #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
- #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
- #define _IOC_NRSHIFT 0
- #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
- #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
- #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
- /*
- * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
- * And this turns out useful to catch old ioctl numbers in header
- * files for us.
- */
- #define _IOC_NONE 1U
- #define _IOC_READ 2U
- #define _IOC_WRITE 4U
- /*
- * The following are included for compatibility
- */
- #define _IOC_VOID 0x20000000
- #define _IOC_OUT 0x40000000
- #define _IOC_IN 0x80000000
- #define _IOC_INOUT (IOC_IN|IOC_OUT)
- #define _IOC(dir, type, nr, size) \
- (((dir) << _IOC_DIRSHIFT) | \
- ((type) << _IOC_TYPESHIFT) | \
- ((nr) << _IOC_NRSHIFT) | \
- ((size) << _IOC_SIZESHIFT))
- #ifdef __KERNEL__
- /* provoke compile error for invalid uses of size argument */
- extern unsigned int __invalid_size_argument_for_IOC;
- #define _IOC_TYPECHECK(t) \
- ((sizeof(t) == sizeof(t[1]) && \
- sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
- sizeof(t) : __invalid_size_argument_for_IOC)
- #else
- #define _IOC_TYPECHECK(t) (sizeof(t))
- #endif
- /* used to create numbers */
- #define _IO(type, nr) _IOC(_IOC_NONE, (type), (nr), 0)
- #define _IOR(type, nr, size) _IOC(_IOC_READ, (type), (nr), (_IOC_TYPECHECK(size)))
- #define _IOW(type, nr, size) _IOC(_IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(size)))
- #define _IOWR(type, nr, size) _IOC(_IOC_READ|_IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(size)))
- #define _IOR_BAD(type, nr, size) _IOC(_IOC_READ, (type), (nr), sizeof(size))
- #define _IOW_BAD(type, nr, size) _IOC(_IOC_WRITE, (type), (nr), sizeof(size))
- #define _IOWR_BAD(type, nr, size) _IOC(_IOC_READ|_IOC_WRITE, (type), (nr), sizeof(size))
- /* used to decode them.. */
- #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
- #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
- #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
- #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
- /* ...and for the drivers/sound files... */
- #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
- #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
- #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
- #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
- #define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
- #endif /* _ASM_IOCTL_H */
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