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-.\" Copyright (c) 1998, Nicolas Souchu
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-.\"
-.\"
-.Dd June 6, 1998
-.Dt MICROSEQ 9
-.Os FreeBSD
-.Sh NAME
-.Nm microseq
-.Nd
-ppbus microseqencer developer's guide
-.Sh SYNOPSIS
-.Fd "#include <dev/ppbus/ppb_msq.h>"
-.Sh DESCRIPTION
-See
-.Xr ppbus 4
-for ppbus description and general info about the microsequencer.
-.Pp
-The purpose of this document is to encourage developers to use the
-microsequencer mechanism in order to have:
-.Bl -enum -offset indent
-.It
-a uniform programming model
-.It
-efficient code
-.El
-.Sh INTERFACE
-.Ss C structures
-.Bd -literal
-union ppb_insarg {
-	int	i;
-	char	c;
-	void	*p;
-	int	(* f)(void *, char *);
-};
-.Ed
-.Bd -literal
-struct ppb_microseq {
-	int			opcode;		/* microins. opcode */
-	union ppb_insarg	arg[PPB_MS_MAXARGS];	/* arguments */
-};
-.Ed
-.Ss Using microsequences
-.Pp
-To instanciate a microsequence, just declare an array of ppb_microseq
-structures and initialize it as needed. You may either use defined macros
-or code directly your microinstructions according to the ppb_microseq
-definition. For example,
-.Bd -literal
-	struct ppb_microseq select_microseq[] = {
-
-		/* parameter list
-		 */
-		#define SELECT_TARGET    MS_PARAM(0, 1, MS_TYP_INT)
-		#define SELECT_INITIATOR MS_PARAM(3, 1, MS_TYP_INT)
-
-		/* send the select command to the drive */
-		MS_DASS(MS_UNKNOWN),
-		MS_CASS(H_nAUTO | H_nSELIN |  H_INIT | H_STROBE),
-		MS_CASS( H_AUTO | H_nSELIN |  H_INIT | H_STROBE),
-		MS_DASS(MS_UNKNOWN),
-		MS_CASS( H_AUTO | H_nSELIN | H_nINIT | H_STROBE),
-
-		/* now, wait until the drive is ready */
-		MS_SET(VP0_SELTMO),
-/* loop: */	MS_BRSET(H_ACK, 3 /* ready */),
-		MS_DBRA(-1 /* loop */),
-/* error: */	MS_RET(1),
-/* ready: */	MS_RET(0)
-	};
-.Ed
-.Pp
-Here, some parameters are undefined and must be filled before executing
-the microsequence. In order to initialize seach a microsequence, one should
-use the ppb_MS_init_msq() function like this:
-.Bd -literal
-	ppb_MS_init_msq(select_microseq, 2,
-			SELECT_TARGET, 1 << target,
-			SELECT_INITIATOR, 1 << initiator);
-.Ed
-.Pp
-and then execute the microsequence.
-.Ss The microsequencer
-The microsequencer is executed either at ppbus or adapter level (see
-.Xr ppbus 4
-for info about ppbus system layers).
-.Sh SEE ALSO
-.Xr ppbus 4
-.Sh HISTORY
-The
-.Nm
-manual page first appeared in
-.Fx 3.0 .
-.Sh AUTHOR
-This
-manual page was written by
-.An Nicolas Souchu .