1 /* $NetBSD: ioccom.h,v 1.11 2011/10/19 10:53:12 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ioccom.h 8.3 (Berkeley) 1/9/95 32 */ 33 34 #ifndef _SYS_IOCCOM_H_ 35 #define _SYS_IOCCOM_H_ 36 37 #if !defined(__minix) 38 /* 39 * Ioctl's have the command encoded in the lower word, and the size of 40 * any in or out parameters in the upper word. The high 3 bits of the 41 * upper word are used to encode the in/out status of the parameter. 42 * 43 * 31 29 28 16 15 8 7 0 44 * +---------------------------------------------------------------+ 45 * | I/O | Parameter Length | Command Group | Command | 46 * +---------------------------------------------------------------+ 47 */ 48 #define IOCPARM_MASK 0x1fff /* parameter length, at most 13 bits */ 49 #else 50 /* For Minix, reserve one extra flag bit: the 'big' size flag. 51 * We have big ioctls and can't help it. 52 * 53 * 31 28 27 16 15 8 7 0 54 * +----------------------------------------------------------------+ 55 * | I/O/B | Parameter Length | Command Group | Command | 56 * +----------------------------------------------------------------+ 57 */ 58 #define IOC_BIG (unsigned long)0x10000000 59 #define IOCPARM_MASK 0xfff /* parameter length, at most 12 bits */ 60 #define IOCPARM_MASK_BIG 0xFFFFF /* or 20 bits, if IOC_BIG is set */ 61 #define IOCPARM_SHIFT_BIG 8 62 #endif /* !defined(__minix) */ 63 64 #define IOCPARM_SHIFT 16 65 #define IOCGROUP_SHIFT 8 66 #define IOCPARM_LEN(x) (((x) >> IOCPARM_SHIFT) & IOCPARM_MASK) 67 #define IOCBASECMD(x) ((x) & ~(IOCPARM_MASK << IOCPARM_SHIFT)) 68 #define IOCGROUP(x) (((x) >> IOCGROUP_SHIFT) & 0xff) 69 70 #define IOCPARM_MAX NBPG /* max size of ioctl args, mult. of NBPG */ 71 /* no parameters */ 72 #define IOC_VOID (unsigned long)0x20000000 73 /* copy parameters out */ 74 #define IOC_OUT (unsigned long)0x40000000 75 /* copy parameters in */ 76 #define IOC_IN (unsigned long)0x80000000 77 /* copy parameters in and out */ 78 #define IOC_INOUT (IOC_IN|IOC_OUT) 79 /* mask for IN/OUT/VOID */ 80 #define IOC_DIRMASK (unsigned long)0xe0000000 81 82 #define _IOC(inout, group, num, len) \ 83 ((inout) | (((len) & IOCPARM_MASK) << IOCPARM_SHIFT) | \ 84 ((group) << IOCGROUP_SHIFT) | (num)) 85 #define _IO(g,n) _IOC(IOC_VOID, (g), (n), 0) 86 #define _IOR(g,n,t) _IOC(IOC_OUT, (g), (n), sizeof(t)) 87 #define _IOW(g,n,t) _IOC(IOC_IN, (g), (n), sizeof(t)) 88 /* this should be _IORW, but stdio got there first */ 89 #define _IOWR(g,n,t) _IOC(IOC_INOUT, (g), (n), sizeof(t)) 90 91 #if defined(__minix) 92 #define _IOW_BIG(y,t) (y | ((sizeof(t) & IOCPARM_MASK_BIG) << IOCPARM_SHIFT_BIG) \ 93 | IOC_IN | IOC_BIG) 94 #define _IOR_BIG(y,t) (y | ((sizeof(t) & IOCPARM_MASK_BIG) << IOCPARM_SHIFT_BIG) \ 95 | IOC_OUT | IOC_BIG) 96 #define _IORW_BIG(y,t) (y | ((sizeof(t) & IOCPARM_MASK_BIG) << IOCPARM_SHIFT_BIG) \ 97 | IOC_INOUT | IOC_BIG) 98 99 /* Decode an ioctl call. */ 100 #define _MINIX_IOCTL_SIZE(i) (((i) >> IOCPARM_SHIFT) & IOCPARM_MASK) 101 #define _MINIX_IOCTL_IOR(i) ((i) & IOC_OUT) 102 #define _MINIX_IOCTL_IORW(i) ((i) & IOC_INOUT) 103 #define _MINIX_IOCTL_IOW(i) ((i) & IOC_IN) 104 105 /* Recognize and decode size of a 'big' ioctl call. */ 106 #define _MINIX_IOCTL_BIG(i) ((i) & IOC_BIG) 107 #define _MINIX_IOCTL_SIZE_BIG(i) (((i) >> IOCPARM_SHIFT_BIG) & IOCPARM_MASK_BIG) 108 #endif /* defined(__minix) */ 109 110 #endif /* !_SYS_IOCCOM_H_ */ 111