95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
/*
|
|
* 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))
|
|
|
|
/* 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)
|
|
|
|
/* 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 */
|