rsp.h

早期freebsd实现

/*-
 * Copyright (c) 1982, 1986 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 *
 *	@(#)rsp.h	7.2 (Berkeley) 5/9/91
 */

/*
 * TU58 transfer protocol constants and data structures
 */

/*
 * Structure of a command packet
 */
struct packet {
	u_char	pk_flag;	/* indicates packet type (cmd, data, etc.) */
	u_char	pk_mcount;	/* length of packet (bytes) */
	u_char	pk_op;		/* operation to perform (read, write, etc.) */
	u_char	pk_mod;		/* modifier for op or returned status */
	u_char	pk_unit;	/* unit number */
	u_char	pk_sw;		/* switches */
	u_short	pk_seq;		/* sequence number, always zero */
	u_short	pk_count;	/* requested byte count for read or write */
	u_short	pk_block;	/* block number for read, write, or seek */
	u_short	pk_chksum;	/* checksum, by words with end around carry */
};

/*
 * States
 */
#define	TUS_INIT1	0	/* sending nulls */
#define	TUS_INIT2	1	/* sending inits */
#define	TUS_IDLE	2	/* initialized, no transfer in progress */
#define	TUS_SENDH	3	/* sending header */
#define	TUS_SENDD	4	/* sending data */
#define	TUS_SENDC	5	/* sending checksum */
#define	TUS_SENDR	6	/* sending read command packet */
#define	TUS_SENDW	7	/* sending write command packet */
#define	TUS_GETH	8	/* reading header */
#define	TUS_GETD	9	/* reading data */
#define	TUS_GETC	10	/* reading checksum */
#define	TUS_GET		11	/* reading an entire packet */
#define	TUS_WAIT	12	/* waiting for continue */
#define	TUS_RCVERR	13	/* receiver error in pseudo DMA routine */
#define	TUS_CHKERR	14	/* checksum error in pseudo DMA routine */

#define	TUS_NSTATES	15

#define	printstate(state) \
	if ((state) < TUS_NSTATES) \
		printf("%s", tustates[(state)]); \
	else \
		printf("%d", (state));

/*
 * Packet Flags
 */
#define	TUF_DATA	1		/* data packet */
#define	TUF_CMD		2		/* command packet */
#define	TUF_INITF	4		/* initialize */
#define	TUF_CONT	020		/* continue */
#define	TUF_XOFF	023		/* flow control */

/*
 * Op Codes
 */
#define	TUOP_NOOP	0		/* no operation */
#define	TUOP_INIT	1		/* initialize */
#define	TUOP_READ	2		/* read block */
#define	TUOP_WRITE	3		/* write block */
#define	TUOP_SEEK	5		/* seek to block */
#define TUOP_DIAGNOSE	7		/* run micro-diagnostics */
#define	TUOP_END	0100		/* end packet */

/*
 * Mod Flags
 */
#define TUMD_WRV        1               /* write with read verify */

/*
 * Switches
 */
#define	TUSW_MRSP	010		/* use Modified RSP */