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      1 /*	$NetBSD: remote-sl.h,v 1.4 2005/12/11 12:19:06 christos Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * All advertising materials mentioning features or use of this software
     12  * must display the following acknowledgement:
     13  *	This product includes software developed by the University of
     14  *	California, Lawrence Berkeley Laboratory.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  * 3. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  *	@(#)remote-sl.h	8.1 (Berkeley) 6/11/93
     41  */
     42 
     43 /*
     44  * These definitions are factored out into an include file so
     45  * the kernel stub has access to them.
     46  */
     47 #define FRAME_START		0xc1		/* Frame End */
     48 #define FRAME_END		0xc0		/* Frame End */
     49 #define FRAME_ESCAPE		0xdb		/* Frame Esc */
     50 #define TRANS_FRAME_START	0xde		/* transposed frame start */
     51 #define TRANS_FRAME_END		0xdc		/* transposed frame esc */
     52 #define TRANS_FRAME_ESCAPE	0xdd		/* transposed frame esc */
     53 
     54 /*
     55  * Message limits. SL_MAXDATA is the maximum number of bytes that can
     56  * be read or written. SL_BUFSIZE is the maximum amount of data that
     57  * can be passed across the serial link. The actual MTU is two times
     58  * the max message (since each byte might be escaped), plus the two
     59  * framing bytes. We add two to the message length to account for the
     60  * type byte and checksum.
     61  */
     62 #define SL_MAXDATA 62			/* max data that can be read */
     63 #define SL_RPCSIZE (1 + SL_MAXDATA)	/* errno byte + data */
     64 #define SL_MTU ((2 * (SL_RPCSIZE + 2) + 2))
     65