1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _SPARC_IOCTL_H 3 #define _SPARC_IOCTL_H 4 5 /* 6 * Our DIR and SIZE overlap in order to simulteneously provide 7 * a non-zero _IOC_NONE (for binary compatibility) and 8 * 14 bits of size as on i386. Here's the layout: 9 * 10 * 0xE0000000 DIR 11 * 0x80000000 DIR = WRITE 12 * 0x40000000 DIR = READ 13 * 0x20000000 DIR = NONE 14 * 0x3FFF0000 SIZE (overlaps NONE bit) 15 * 0x0000FF00 TYPE 16 * 0x000000FF NR (CMD) 17 */ 18 19 #define _IOC_NRBITS 8 20 #define _IOC_TYPEBITS 8 21 #define _IOC_SIZEBITS 13 /* Actually 14, see below. */ 22 #define _IOC_DIRBITS 3 23 24 #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) 25 #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) 26 #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) 27 #define _IOC_XSIZEMASK ((1 << (_IOC_SIZEBITS+1))-1) 28 #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) 29 30 #define _IOC_NRSHIFT 0 31 #define _IOC_TYPESHIFT (_IOC_NRSHIFT + _IOC_NRBITS) 32 #define _IOC_SIZESHIFT (_IOC_TYPESHIFT + _IOC_TYPEBITS) 33 #define _IOC_DIRSHIFT (_IOC_SIZESHIFT + _IOC_SIZEBITS) 34 35 #define _IOC_NONE 1U 36 #define _IOC_READ 2U 37 #define _IOC_WRITE 4U 38 39 #define _IOC(dir,type,nr,size) \ 40 (((dir) << _IOC_DIRSHIFT) | \ 41 ((type) << _IOC_TYPESHIFT) | \ 42 ((nr) << _IOC_NRSHIFT) | \ 43 ((size) << _IOC_SIZESHIFT)) 44 45 #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) 46 #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) 47 #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) 48 #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) 49 50 /* Used to decode ioctl numbers in drivers despite the leading underscore... */ 51 #define _IOC_DIR(nr) \ 52 ( (((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) != 0)? \ 53 (((nr) >> _IOC_DIRSHIFT) & (_IOC_WRITE|_IOC_READ)): \ 54 (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) ) 55 #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) 56 #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) 57 #define _IOC_SIZE(nr) \ 58 ((((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) == 0)? \ 59 0: (((nr) >> _IOC_SIZESHIFT) & _IOC_XSIZEMASK)) 60 61 /* ...and for the PCMCIA and sound. */ 62 #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) 63 #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) 64 #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) 65 #define IOCSIZE_MASK (_IOC_XSIZEMASK << _IOC_SIZESHIFT) 66 #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) 67 68 #endif /* !(_SPARC_IOCTL_H) */ 69