1 /* SPDX-License-Identifier: GPL-2.0 */ !! 1 /*
2 #ifndef _ASM_GENERIC_IOCTL_H !! 2 * Linux ioctl() stuff.
3 #define _ASM_GENERIC_IOCTL_H !! 3 *
4 !! 4 * This file is subject to the terms and conditions of the GNU General Public
5 #include <uapi/asm-generic/ioctl.h> !! 5 * License. See the file "COPYING" in the main directory of this archive
6 !! 6 * for more details.
7 #ifdef __CHECKER__ !! 7 *
8 #define _IOC_TYPECHECK(t) (sizeof(t)) !! 8 * Copyright (C) 1995, 1996, 2001 by Ralf Baechle
9 #else !! 9 */
10 /* provoke compile error for invalid uses of s !! 10 #ifndef __ASM_MIPS_IOCTL_H
11 extern unsigned int __invalid_size_argument_fo !! 11 #define __ASM_MIPS_IOCTL_H
12 #define _IOC_TYPECHECK(t) \ <<
13 ((sizeof(t) == sizeof(t[1]) && \ <<
14 sizeof(t) < (1 << _IOC_SIZEBITS)) ? <<
15 sizeof(t) : __invalid_size_argument_ <<
16 #endif <<
17 12
18 #endif /* _ASM_GENERIC_IOCTL_H */ !! 13 /*
>> 14 * The original linux ioctl numbering scheme was just a general
>> 15 * "anything goes" setup, where more or less random numbers were
>> 16 * assigned. Sorry, I was clueless when I started out on this.
>> 17 *
>> 18 * On the alpha, we'll try to clean it up a bit, using a more sane
>> 19 * ioctl numbering, and also trying to be compatible with OSF/1 in
>> 20 * the process. I'd like to clean it up for the i386 as well, but
>> 21 * it's so painful recognizing both the new and the old numbers..
>> 22 *
>> 23 * The same applies for for the MIPS ABI; in fact even the macros
>> 24 * from Linux/Alpha fit almost perfectly.
>> 25 */
>> 26
>> 27 #define _IOC_NRBITS 8
>> 28 #define _IOC_TYPEBITS 8
>> 29 #define _IOC_SIZEBITS 13
>> 30 #define _IOC_DIRBITS 3
>> 31
>> 32 #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
>> 33 #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
>> 34 #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
>> 35 #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
>> 36
>> 37 #define _IOC_NRSHIFT 0
>> 38 #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
>> 39 #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
>> 40 #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
>> 41
>> 42 /*
>> 43 * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
>> 44 * And this turns out useful to catch old ioctl numbers in header
>> 45 * files for us.
>> 46 */
>> 47 #define _IOC_NONE 1U
>> 48 #define _IOC_READ 2U
>> 49 #define _IOC_WRITE 4U
>> 50
>> 51 /*
>> 52 * The following are included for compatibility
>> 53 */
>> 54 #define _IOC_VOID 0x20000000
>> 55 #define _IOC_OUT 0x40000000
>> 56 #define _IOC_IN 0x80000000
>> 57 #define _IOC_INOUT (IOC_IN|IOC_OUT)
>> 58
>> 59 #define _IOC(dir,type,nr,size) \
>> 60 (((dir) << _IOC_DIRSHIFT) | \
>> 61 ((type) << _IOC_TYPESHIFT) | \
>> 62 ((nr) << _IOC_NRSHIFT) | \
>> 63 ((size) << _IOC_SIZESHIFT))
>> 64
>> 65 /* used to create numbers */
>> 66 #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
>> 67 #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
>> 68 #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
>> 69 #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
>> 70
>> 71 /* used to decode them.. */
>> 72 #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
>> 73 #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
>> 74 #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
>> 75 #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
>> 76
>> 77 /* ...and for the drivers/sound files... */
>> 78
>> 79 #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
>> 80 #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
>> 81 #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
>> 82 #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
>> 83 #define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
>> 84
>> 85 #endif /* __ASM_MIPS_IOCTL_H */
19 86
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