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Annotation of kernel/bsd/netccitt/hdlc.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*-
        !            26:  * Copyright (c) University of British Columbia, 1984
        !            27:  * Copyright (c) 1991, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * This code is derived from software contributed to Berkeley by the
        !            31:  * Laboratory for Computation Vision and the Computer Science Department
        !            32:  * of the University of British Columbia.
        !            33:  *
        !            34:  * Redistribution and use in source and binary forms, with or without
        !            35:  * modification, are permitted provided that the following conditions
        !            36:  * are met:
        !            37:  * 1. Redistributions of source code must retain the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer.
        !            39:  * 2. Redistributions in binary form must reproduce the above copyright
        !            40:  *    notice, this list of conditions and the following disclaimer in the
        !            41:  *    documentation and/or other materials provided with the distribution.
        !            42:  * 3. All advertising materials mentioning features or use of this software
        !            43:  *    must display the following acknowledgement:
        !            44:  *     This product includes software developed by the University of
        !            45:  *     California, Berkeley and its contributors.
        !            46:  * 4. Neither the name of the University nor the names of its contributors
        !            47:  *    may be used to endorse or promote products derived from this software
        !            48:  *    without specific prior written permission.
        !            49:  *
        !            50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            60:  * SUCH DAMAGE.
        !            61:  *
        !            62:  *     @(#)hdlc.h      8.1 (Berkeley) 6/10/93
        !            63:  */
        !            64: 
        !            65: #ifndef ORDER4
        !            66: #define FALSE   0
        !            67: #define TRUE    1
        !            68: typedef u_char octet;
        !            69: typedef char    bool;
        !            70: 
        !            71: /*
        !            72:  *  HDLC Packet format definitions
        !            73:  *  This will eventually have to be rewritten without reference
        !            74:  *  to bit fields, to be compliant with ANSI C and alignment safe.
        !            75:  */
        !            76: 
        !            77: #if BYTE_ORDER == BIG_ENDIAN
        !            78: #define ORDER4(a, b, c, d) a , b , c , d
        !            79: #define ORDER5(a, b, c, d, e) a , b , c , d , e
        !            80: #endif
        !            81: 
        !            82: #if BYTE_ORDER == LITTLE_ENDIAN
        !            83: #define ORDER4(a, b, c, d) d , c , b , a
        !            84: #define ORDER5(a, b, c, d, e) e , d , c , b , a
        !            85: #endif
        !            86: #endif
        !            87: 
        !            88: #define MAX_INFO_LEN    4096+3+4
        !            89: #define ADDRESS_A       3      /* B'00000011' */
        !            90: #define ADDRESS_B       1      /* B'00000001' */
        !            91: 
        !            92: struct Hdlc_iframe {
        !            93:        octet   address;
        !            94:        octet   ORDER4(nr:3, pf:1, ns:3, hdlc_0:1);
        !            95:        octet    i_field[MAX_INFO_LEN];
        !            96: };
        !            97: 
        !            98: struct Hdlc_sframe {
        !            99:        octet   address;
        !           100:        octet   ORDER4(nr:3, pf:1, s2:2, hdlc_01:2);
        !           101: };
        !           102: 
        !           103: struct Hdlc_uframe {
        !           104:        octet   address;
        !           105:        octet   ORDER4(m3:3, pf:1, m2:2, hdlc_11:2);
        !           106: };
        !           107: 
        !           108: struct Frmr_frame {
        !           109:        octet   address;
        !           110:        octet   control;
        !           111:        octet   frmr_control;
        !           112:        octet   ORDER4(frmr_nr:3, frmr_f1_0:1, frmr_ns:3, frmr_f2_0:1);
        !           113:        octet   ORDER5(frmr_0000:4, frmr_z:1, frmr_y:1, frmr_x:1, frmr_w:1);
        !           114: };
        !           115: 
        !           116: #define HDHEADERLN     2
        !           117: #define MINFRLN                2               /* Minimum frame length. */
        !           118: 
        !           119: struct Hdlc_frame {
        !           120:        octet   address;
        !           121:        octet   control;
        !           122:        octet   info[3];        /* min for FRMR */
        !           123: };
        !           124: 
        !           125: #define SABM_CONTROL 057       /* B'00101111' */
        !           126: #define UA_CONTROL   0143      /* B'01100011' */
        !           127: #define DISC_CONTROL 0103      /* B'01000011' */
        !           128: #define DM_CONTROL   017       /* B'00001111' */
        !           129: #define FRMR_CONTROL 0207      /* B'10000111' */
        !           130: #define RR_CONTROL   01                /* B'00000001' */
        !           131: #define RNR_CONTROL  05                /* B'00000101' */
        !           132: #define REJ_CONTROL  011       /* B'00001001' */
        !           133: 
        !           134: #define POLLOFF  0
        !           135: #define POLLON   1
        !           136: 
        !           137: /* Define Link State constants. */
        !           138: 
        !           139: #define INIT           0
        !           140: #define DM_SENT                1
        !           141: #define SABM_SENT      2
        !           142: #define ABM            3
        !           143: #define WAIT_SABM      4
        !           144: #define WAIT_UA                5
        !           145: #define DISC_SENT      6
        !           146: #define DISCONNECTED   7
        !           147: #define MAXSTATE       8
        !           148: 
        !           149: /* The following constants are used in a switch statement to process
        !           150:    frames read from the communications line. */
        !           151: 
        !           152: #define SABM     0 * MAXSTATE
        !           153: #define DM       1 * MAXSTATE
        !           154: #define DISC     2 * MAXSTATE
        !           155: #define UA       3 * MAXSTATE
        !           156: #define FRMR     4 * MAXSTATE
        !           157: #define RR       5 * MAXSTATE
        !           158: #define RNR      6 * MAXSTATE
        !           159: #define REJ      7 * MAXSTATE
        !           160: #define IFRAME   8 * MAXSTATE
        !           161: #define ILLEGAL  9 * MAXSTATE
        !           162: 
        !           163: #define T1     (3 * PR_SLOWHZ)         /*  IFRAME TIMEOUT - 3 seconds */
        !           164: #define T3     (T1 / 2)                /*  RR generate timeout - 1.5 seconds */
        !           165: #define N2     10
        !           166: #define MODULUS 8
        !           167: #define MAX_WINDOW_SIZE 7
        !           168: 
        !           169: #define Z  0
        !           170: #define Y  1
        !           171: #define X  2
        !           172: #define W  3
        !           173: #define A  4
        !           174: 
        !           175: #define TX 0
        !           176: #define RX 1
        !           177: 
        !           178: bool   range_check ();
        !           179: bool   valid_nr ();
        !           180: struct mbuf *hd_remove ();

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