1#ifndef _ASM_POWERPC_IOCTL_H 2#define _ASM_POWERPC_IOCTL_H 3 4 5/* 6 * this was copied from the alpha as it's a bit cleaner there. 7 * -- Cort 8 */ 9 10#define _IOC_NRBITS 8 11#define _IOC_TYPEBITS 8 12#define _IOC_SIZEBITS 13 13#define _IOC_DIRBITS 3 14 15#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) 16#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) 17#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) 18#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) 19 20#define _IOC_NRSHIFT 0 21#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) 22#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) 23#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) 24 25/* 26 * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit. 27 * And this turns out useful to catch old ioctl numbers in header 28 * files for us. 29 */ 30#define _IOC_NONE 1U 31#define _IOC_READ 2U 32#define _IOC_WRITE 4U 33 34#define _IOC(dir,type,nr,size) \ 35 (((dir) << _IOC_DIRSHIFT) | \ 36 ((type) << _IOC_TYPESHIFT) | \ 37 ((nr) << _IOC_NRSHIFT) | \ 38 ((size) << _IOC_SIZESHIFT)) 39 40/* provoke compile error for invalid uses of size argument */ 41extern unsigned int __invalid_size_argument_for_IOC; 42#define _IOC_TYPECHECK(t) \ 43 ((sizeof(t) == sizeof(t[1]) && \ 44 sizeof(t) < (1 << _IOC_SIZEBITS)) ? \ 45 sizeof(t) : __invalid_size_argument_for_IOC) 46 47/* used to create numbers */ 48#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) 49#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size))) 50#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) 51#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) 52#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) 53#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) 54#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) 55 56/* used to decode them.. */ 57#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) 58#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) 59#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) 60#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) 61 62/* various drivers, such as the pcmcia stuff, need these... */ 63#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) 64#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) 65#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) 66#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) 67#define IOCSIZE_SHIFT (_IOC_SIZESHIFT) 68 69#endif /* _ASM_POWERPC_IOCTL_H */ 70