| /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| #ifndef _ALPHA_IOCTL_H |
| #define _ALPHA_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.. |
| */ |
| |
| #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 |
| |
| #define _IOC(dir,type,nr,size) \ |
| ((unsigned int) \ |
| (((dir) << _IOC_DIRSHIFT) | \ |
| ((type) << _IOC_TYPESHIFT) | \ |
| ((nr) << _IOC_NRSHIFT) | \ |
| ((size) << _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 /* _ALPHA_IOCTL_H */ |
