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lib
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linux
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uapi
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sparc
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asm
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Filename :
ioctl.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _SPARC_IOCTL_H #define _SPARC_IOCTL_H /* * Our DIR and SIZE overlap in order to simulteneously provide * a non-zero _IOC_NONE (for binary compatibility) and * 14 bits of size as on i386. Here's the layout: * * 0xE0000000 DIR * 0x80000000 DIR = WRITE * 0x40000000 DIR = READ * 0x20000000 DIR = NONE * 0x3FFF0000 SIZE (overlaps NONE bit) * 0x0000FF00 TYPE * 0x000000FF NR (CMD) */ #define _IOC_NRBITS 8 #define _IOC_TYPEBITS 8 #define _IOC_SIZEBITS 13 /* Actually 14, see below. */ #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_XSIZEMASK ((1 << (_IOC_SIZEBITS+1))-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) #define _IOC_NONE 1U #define _IOC_READ 2U #define _IOC_WRITE 4U #define _IOC(dir,type,nr,size) \ (((dir) << _IOC_DIRSHIFT) | \ ((type) << _IOC_TYPESHIFT) | \ ((nr) << _IOC_NRSHIFT) | \ ((size) << _IOC_SIZESHIFT)) #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 ioctl numbers in drivers despite the leading underscore... */ #define _IOC_DIR(nr) \ ( (((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) != 0)? \ (((nr) >> _IOC_DIRSHIFT) & (_IOC_WRITE|_IOC_READ)): \ (((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_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) == 0)? \ 0: (((nr) >> _IOC_SIZESHIFT) & _IOC_XSIZEMASK)) /* ...and for the PCMCIA and sound. */ #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_XSIZEMASK << _IOC_SIZESHIFT) #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) #endif /* !(_SPARC_IOCTL_H) */