1/* $Id: ioctl.h,v 1.1.1.1 2008/10/15 03:27:22 james26_jang Exp $ 2 * 3 * linux/ioctl.h for Linux by H.H. Bergman. 4 */ 5 6#ifndef _ASM_PARISC_IOCTL_H 7#define _ASM_PARISC_IOCTL_H 8 9/* ioctl command encoding: 32 bits total, command in lower 16 bits, 10 * size of the parameter structure in the lower 14 bits of the 11 * upper 16 bits. 12 * Encoding the size of the parameter structure in the ioctl request 13 * is useful for catching programs compiled with old versions 14 * and to avoid overwriting user space outside the user buffer area. 15 * The highest 2 bits are reserved for indicating the ``access mode''. 16 * NOTE: This limits the max parameter size to 16kB -1 ! 17 */ 18 19#define _IOC_NRBITS 8 20#define _IOC_TYPEBITS 8 21#define _IOC_SIZEBITS 14 22#define _IOC_DIRBITS 2 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_DIRMASK ((1 << _IOC_DIRBITS)-1) 28 29#define _IOC_NRSHIFT 0 30#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) 31#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) 32#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) 33 34/* 35 * Direction bits. 36 */ 37#define _IOC_NONE 0U 38#define _IOC_WRITE 2U 39#define _IOC_READ 1U 40 41#define _IOC(dir,type,nr,size) \ 42 (((dir) << _IOC_DIRSHIFT) | \ 43 ((type) << _IOC_TYPESHIFT) | \ 44 ((nr) << _IOC_NRSHIFT) | \ 45 ((size) << _IOC_SIZESHIFT)) 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),sizeof(size)) 50#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) 51#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) 52 53/* used to decode ioctl numbers.. */ 54#define _IOC_DIR(nr) (((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) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) 58 59/* ...and for the drivers/sound files... */ 60 61#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) 62#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) 63#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) 64#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) 65#define IOCSIZE_SHIFT (_IOC_SIZESHIFT) 66 67#endif /* _ASM_PARISC_IOCTL_H */ 68