1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*4882a593Smuzhiyun #ifndef _ALPHA_IOCTL_H 3*4882a593Smuzhiyun #define _ALPHA_IOCTL_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun /* 6*4882a593Smuzhiyun * The original linux ioctl numbering scheme was just a general 7*4882a593Smuzhiyun * "anything goes" setup, where more or less random numbers were 8*4882a593Smuzhiyun * assigned. Sorry, I was clueless when I started out on this. 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun * On the alpha, we'll try to clean it up a bit, using a more sane 11*4882a593Smuzhiyun * ioctl numbering, and also trying to be compatible with OSF/1 in 12*4882a593Smuzhiyun * the process. I'd like to clean it up for the i386 as well, but 13*4882a593Smuzhiyun * it's so painful recognizing both the new and the old numbers.. 14*4882a593Smuzhiyun */ 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #define _IOC_NRBITS 8 17*4882a593Smuzhiyun #define _IOC_TYPEBITS 8 18*4882a593Smuzhiyun #define _IOC_SIZEBITS 13 19*4882a593Smuzhiyun #define _IOC_DIRBITS 3 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) 22*4882a593Smuzhiyun #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) 23*4882a593Smuzhiyun #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) 24*4882a593Smuzhiyun #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun #define _IOC_NRSHIFT 0 27*4882a593Smuzhiyun #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) 28*4882a593Smuzhiyun #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) 29*4882a593Smuzhiyun #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun /* 32*4882a593Smuzhiyun * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit. 33*4882a593Smuzhiyun * And this turns out useful to catch old ioctl numbers in header 34*4882a593Smuzhiyun * files for us. 35*4882a593Smuzhiyun */ 36*4882a593Smuzhiyun #define _IOC_NONE 1U 37*4882a593Smuzhiyun #define _IOC_READ 2U 38*4882a593Smuzhiyun #define _IOC_WRITE 4U 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun #define _IOC(dir,type,nr,size) \ 41*4882a593Smuzhiyun ((unsigned int) \ 42*4882a593Smuzhiyun (((dir) << _IOC_DIRSHIFT) | \ 43*4882a593Smuzhiyun ((type) << _IOC_TYPESHIFT) | \ 44*4882a593Smuzhiyun ((nr) << _IOC_NRSHIFT) | \ 45*4882a593Smuzhiyun ((size) << _IOC_SIZESHIFT))) 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun /* used to create numbers */ 48*4882a593Smuzhiyun #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) 49*4882a593Smuzhiyun #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) 50*4882a593Smuzhiyun #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) 51*4882a593Smuzhiyun #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun /* used to decode them.. */ 54*4882a593Smuzhiyun #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) 55*4882a593Smuzhiyun #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) 56*4882a593Smuzhiyun #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) 57*4882a593Smuzhiyun #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun /* ...and for the drivers/sound files... */ 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) 62*4882a593Smuzhiyun #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) 63*4882a593Smuzhiyun #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) 64*4882a593Smuzhiyun #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) 65*4882a593Smuzhiyun #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) 66*4882a593Smuzhiyun 67*4882a593Smuzhiyun #endif /* _ALPHA_IOCTL_H */ 68