1/* 2 * Linux/PA-RISC Project (http://www.parisc-linux.org/) 3 * Copyright (C) 1999,2003 Matthew Wilcox < willy at debian . org > 4 * portions from "linux/ioctl.h for Linux" by H.H. Bergman. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 22#ifndef _ASM_PARISC_IOCTL_H 23#define _ASM_PARISC_IOCTL_H 24 25/* ioctl command encoding: 32 bits total, command in lower 16 bits, 26 * size of the parameter structure in the lower 14 bits of the 27 * upper 16 bits. 28 * Encoding the size of the parameter structure in the ioctl request 29 * is useful for catching programs compiled with old versions 30 * and to avoid overwriting user space outside the user buffer area. 31 * The highest 2 bits are reserved for indicating the ``access mode''. 32 * NOTE: This limits the max parameter size to 16kB -1 ! 33 */ 34 35#define _IOC_NRBITS 8 36#define _IOC_TYPEBITS 8 37#define _IOC_SIZEBITS 14 38#define _IOC_DIRBITS 2 39 40#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) 41#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) 42#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) 43#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) 44 45#define _IOC_NRSHIFT 0 46#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) 47#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) 48#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) 49 50/* 51 * Direction bits. 52 */ 53#define _IOC_NONE 0U 54#define _IOC_WRITE 2U 55#define _IOC_READ 1U 56 57#define _IOC(dir,type,nr,size) \ 58 (((dir) << _IOC_DIRSHIFT) | \ 59 ((type) << _IOC_TYPESHIFT) | \ 60 ((nr) << _IOC_NRSHIFT) | \ 61 ((size) << _IOC_SIZESHIFT)) 62 63/* provoke compile error for invalid uses of size argument */ 64extern unsigned int __invalid_size_argument_for_IOC; 65#define _IOC_TYPECHECK(t) \ 66 ((sizeof(t) == sizeof(t[1]) && \ 67 sizeof(t) < (1 << _IOC_SIZEBITS)) ? \ 68 sizeof(t) : __invalid_size_argument_for_IOC) 69 70/* used to create numbers */ 71#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) 72#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size))) 73#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) 74#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) 75#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) 76#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) 77#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) 78 79/* used to decode ioctl numbers.. */ 80#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) 81#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) 82#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) 83#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) 84 85/* ...and for the drivers/sound files... */ 86 87#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) 88#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) 89#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) 90#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) 91#define IOCSIZE_SHIFT (_IOC_SIZESHIFT) 92 93#endif /* _ASM_PARISC_IOCTL_H */ 94