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remote-sl.h revision 1.1 
      1 /*
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This software was developed by the Computer Systems Engineering group
      6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      7  * contributed to Berkeley.
      8  *
      9  * All advertising materials mentioning features or use of this software
     10  * must display the following acknowledgement:
     11  *	This product includes software developed by the University of
     12  *	California, Lawrence Berkeley Laboratory.
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  * 1. Redistributions of source code must retain the above copyright
     18  *    notice, this list of conditions and the following disclaimer.
     19  * 2. Redistributions in binary form must reproduce the above copyright
     20  *    notice, this list of conditions and the following disclaimer in the
     21  *    documentation and/or other materials provided with the distribution.
     22  * 3. All advertising materials mentioning features or use of this software
     23  *    must display the following acknowledgement:
     24  *	This product includes software developed by the University of
     25  *	California, Berkeley and its contributors.
     26  * 4. Neither the name of the University nor the names of its contributors
     27  *    may be used to endorse or promote products derived from this software
     28  *    without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40  * SUCH DAMAGE.
     41  *
     42  *	@(#)remote-sl.h	8.1 (Berkeley) 6/11/93
     43  *
     44  * from: Header: remote-sl.h,v 1.6 92/11/26 02:04:45 torek Exp  (LBL)
     45  * $Id: remote-sl.h,v 1.1 1993/10/02 10:23:27 deraadt Exp $
     46  */
     47 
     48 /*
     49  * These definitions are factored out into an include file so
     50  * the kernel stub has access to them.
     51  */
     52 #define FRAME_START		0xc1		/* Frame End */
     53 #define FRAME_END		0xc0		/* Frame End */
     54 #define FRAME_ESCAPE		0xdb		/* Frame Esc */
     55 #define TRANS_FRAME_START	0xde		/* transposed frame start */
     56 #define TRANS_FRAME_END		0xdc		/* transposed frame esc */
     57 #define TRANS_FRAME_ESCAPE	0xdd		/* transposed frame esc */
     58 
     59 /*
     60  * Message limits. SL_MAXDATA is the maximum number of bytes that can
     61  * be read or written. SL_BUFSIZE is the maximum amount of data that
     62  * can be passed across the serial link. The actual MTU is two times
     63  * the max message (since each byte might be escaped), plus the two
     64  * framing bytes. We add two to the message length to account for the
     65  * type byte and checksum.
     66  */
     67 #define SL_MAXDATA 62			/* max data that can be read */
     68 #define SL_RPCSIZE (1 + SL_MAXDATA)	/* errno byte + data */
     69 #define SL_MTU ((2 * (SL_RPCSIZE + 2) + 2))
     70