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/* * Linux ioctl() stuff. * * 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, 1996 by Ralf Baechle */ #ifndef __ASM_MIPS_IOCTL_H #define __ASM_MIPS_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) /* * We to additionally limit parameters to a maximum 255 bytes. */ #define _IOC_SLMASK 0xff /* * 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_SLMASK) << _IOC_SIZESHIFT)) /* used to create numbers */ #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) #define _IOWR(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_MIPS_IOCTL_H */ |