LCOM1920-T02G10

/*        $NetBSD: ioccom.h,v 1.12 2014/12/10 00:16:05 christos Exp $        */

/*-

 * Copyright (c) 1982, 1986, 1990, 1993, 1994

 *        The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *        @(#)ioccom.h        8.3 (Berkeley) 1/9/95

 */

#ifndef        _SYS_IOCCOM_H_

#define        _SYS_IOCCOM_H_

#if !defined(__minix)

/*

 * Ioctl's have the command encoded in the lower word, and the size of

 * any in or out parameters in the upper word.  The high 3 bits of the

 * upper word are used to encode the in/out status of the parameter.

 *

 *         31 29 28                     16 15            8 7             0

 *        +---------------------------------------------------------------+

 *        | I/O | Parameter Length        | Command Group | Command       |

 *        +---------------------------------------------------------------+

 */

#define        IOCPARM_MASK        0x1fff                /* parameter length, at most 13 bits */

#else

/* For Minix, reserve one extra flag bit: the 'big' size flag. 

 * We have big ioctls and can't help it.

 *

 *         31   28 27                     16 15            8 7             0

 *        +----------------------------------------------------------------+

 *        | I/O/B | Parameter Length       | Command Group | Command       |

 *        +----------------------------------------------------------------+

 */

#define IOC_BIG                (unsigned long)0x10000000

#define        IOCPARM_MASK        0xfff                /* parameter length, at most 12 bits */

#define IOCPARM_MASK_BIG       0xFFFFF        /* or 20 bits, if IOC_BIG is set */

#define        IOCPARM_SHIFT_BIG        8        

#endif /* !defined(__minix) */

#define        IOCPARM_SHIFT        16

#define        IOCGROUP_SHIFT        8

#define        IOCPARM_LEN(x)        (((x) >> IOCPARM_SHIFT) & IOCPARM_MASK)

#define        IOCBASECMD(x)        ((x) & ~(IOCPARM_MASK << IOCPARM_SHIFT))

#define        IOCGROUP(x)        (((x) >> IOCGROUP_SHIFT) & 0xff)

#define        IOCPARM_MAX        NBPG        /* max size of ioctl args, mult. of NBPG */

                                /* no parameters */

#define        IOC_VOID        (unsigned long)0x20000000

                                /* copy parameters out */

#define        IOC_OUT                (unsigned long)0x40000000

                                /* copy parameters in */

#define        IOC_IN                (unsigned long)0x80000000

                                /* copy parameters in and out */

#define        IOC_INOUT        (IOC_IN|IOC_OUT)

                                /* mask for IN/OUT/VOID */

#define        IOC_DIRMASK        (unsigned long)0xe0000000

#define        _IOC(inout, group, num, len) \

    ((inout) | (((len) & IOCPARM_MASK) << IOCPARM_SHIFT) | \

    ((group) << IOCGROUP_SHIFT) | (num))

#define        _IO(g,n)        _IOC(IOC_VOID,        (g), (n), 0)

#define        _IOR(g,n,t)        _IOC(IOC_OUT,        (g), (n), sizeof(t))

#define        _IOW(g,n,t)        _IOC(IOC_IN,        (g), (n), sizeof(t))

/* this should be _IORW, but stdio got there first */

#define        _IOWR(g,n,t)        _IOC(IOC_INOUT,        (g), (n), sizeof(t))

#define IOCSNPRINTF(buf, len, cmd) \

    snprintf((buf), (len), "_IO%s%s('%c', %hhu)", \

        (((cmd) >> 30) & 1) ? "W" : "", \

        (((cmd) >> 30) & 2) ? "R" : "", \

        (char)IOCGROUP(cmd), (unsigned char)(cmd))

#if defined(__minix)

#define _IOW_BIG(y,t)  (y | ((sizeof(t) & IOCPARM_MASK_BIG) << IOCPARM_SHIFT_BIG) \

        | IOC_IN | IOC_BIG)

#define _IOR_BIG(y,t)  (y | ((sizeof(t) & IOCPARM_MASK_BIG) << IOCPARM_SHIFT_BIG) \

        | IOC_OUT | IOC_BIG)

#define _IORW_BIG(y,t) (y | ((sizeof(t) & IOCPARM_MASK_BIG) << IOCPARM_SHIFT_BIG) \

        | IOC_INOUT | IOC_BIG)

/* Decode an ioctl call. */

#define _MINIX_IOCTL_SIZE(i)            (((i) >> IOCPARM_SHIFT) & IOCPARM_MASK)

#define _MINIX_IOCTL_IOR(i)             ((i) & IOC_OUT)

#define _MINIX_IOCTL_IOW(i)             ((i) & IOC_IN)

/* Recognize and decode size of a 'big' ioctl call. */

#define _MINIX_IOCTL_BIG(i)             ((i) & IOC_BIG)

#define _MINIX_IOCTL_SIZE_BIG(i)        (((i) >> IOCPARM_SHIFT_BIG) & IOCPARM_MASK_BIG)

#endif /* defined(__minix) */

#endif /* !_SYS_IOCCOM_H_ */