1 /* 2 * Copyright (c) 1992 The Regents of the University of California. 3 * 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 * %sccs.include.redist.c% 10 * 11 * @(#)remote-sl.h 7.1 (Berkeley) 07/13/92 12 * 13 * from: $Header: remote-sl.h,v 1.5 92/06/17 06:10:27 torek Exp $ (LBL) 14 */ 15 16 /* 17 * These definitions are factored out into an include file so 18 * the kernel stub has access to them. 19 */ 20 #define FRAME_START 0xc1 /* Frame End */ 21 #define FRAME_END 0xc0 /* Frame End */ 22 #define FRAME_ESCAPE 0xdb /* Frame Esc */ 23 #define TRANS_FRAME_START 0xde /* transposed frame start */ 24 #define TRANS_FRAME_END 0xdc /* transposed frame esc */ 25 #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ 26 27 /* 28 * Message limits. SL_MAXDATA is the maximum number of bytes that can 29 * be read or written. SL_BUFSIZE is the maximum amount of data that 30 * can be passed across the serial link. The actual MTU is two times 31 * the max message (since each byte might be escaped), plus the two 32 * framing bytes. We add two to the message length to account for the 33 * type byte and checksum. 34 */ 35 #define SL_MAXDATA 62 /* max data that can be read */ 36 #define SL_RPCSIZE (1 + SL_MAXDATA) /* errno byte + data */ 37 #define SL_MTU ((2 * (SL_RPCSIZE + 2) + 2)) 38