130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#ifndef _UAPI_ASM_GENERIC_IOCTL_H 230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _UAPI_ASM_GENERIC_IOCTL_H 330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* ioctl command encoding: 32 bits total, command in lower 16 bits, 530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * size of the parameter structure in the lower 14 bits of the 630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * upper 16 bits. 730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Encoding the size of the parameter structure in the ioctl request 830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * is useful for catching programs compiled with old versions 930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * and to avoid overwriting user space outside the user buffer area. 1030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * The highest 2 bits are reserved for indicating the ``access mode''. 1130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * NOTE: This limits the max parameter size to 16kB -1 ! 1230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng */ 1330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 1430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* 1530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * The following is for compatibility across the various Linux 1630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * platforms. The generic ioctl numbering scheme doesn't really enforce 1730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * a type field. De facto, however, the top 8 bits of the lower 16 1830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * bits are indeed used as a type field, so we might just as well make 1930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * this explicit here. Please be sure to use the decoding macros 2030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * below from now on. 2130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng */ 2230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_NRBITS 8 2330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_TYPEBITS 8 2430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 2530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* 2630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Let any architecture override either of the following before 2730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * including this file. 2830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng */ 2930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 3030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#ifndef _IOC_SIZEBITS 3130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng# define _IOC_SIZEBITS 14 3230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#endif 3330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 3430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#ifndef _IOC_DIRBITS 3530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng# define _IOC_DIRBITS 2 3630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#endif 3730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 3830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) 3930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) 4030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) 4130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) 4230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 4330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_NRSHIFT 0 4430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) 4530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) 4630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) 4730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 4830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* 4930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Direction bits, which any architecture can choose to override 5030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * before including this file. 5130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng */ 5230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 5330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#ifndef _IOC_NONE 5430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng# define _IOC_NONE 0U 5530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#endif 5630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 5730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#ifndef _IOC_WRITE 5830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng# define _IOC_WRITE 1U 5930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#endif 6030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 6130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#ifndef _IOC_READ 6230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng# define _IOC_READ 2U 6330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#endif 6430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 6530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC(dir,type,nr,size) \ 6630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng (((dir) << _IOC_DIRSHIFT) | \ 6730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng ((type) << _IOC_TYPESHIFT) | \ 6830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng ((nr) << _IOC_NRSHIFT) | \ 6930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng ((size) << _IOC_SIZESHIFT)) 7030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 7130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#ifndef __KERNEL__ 7230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_TYPECHECK(t) (sizeof(t)) 7330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#endif 7430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 7530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* used to create numbers */ 7630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) 7730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size))) 7830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) 7930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) 8030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) 8130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) 8230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) 8330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 8430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* used to decode ioctl numbers.. */ 8530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) 8630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) 8730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) 8830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) 8930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 9030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* ...and for the drivers/sound files... */ 9130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 9230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) 9330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) 9430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) 9530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) 9630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define IOCSIZE_SHIFT (_IOC_SIZESHIFT) 9730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 9830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#endif /* _UAPI_ASM_GENERIC_IOCTL_H */ 99