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119 lines
3.6 KiB
Groff
119 lines
3.6 KiB
Groff
.\" Copyright (c) 1998, Nicolas Souchu
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\"
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.Dd June 6, 1998
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.Dt MICROSEQ 9
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.Os FreeBSD
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.Sh NAME
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.Nm microseq
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.Nd
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ppbus microseqencer developer's guide
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.Sh SYNOPSIS
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.Fd "#include <dev/ppbus/ppb_msq.h>"
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.Sh DESCRIPTION
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See
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.Xr ppbus 4
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for ppbus description and general info about the microsequencer.
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.Pp
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The purpose of this document is to encourage developers to use the
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microsequencer mechanism in order to have:
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.Bl -enum -offset indent
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.It
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a uniform programming model
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.It
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efficient code
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.El
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.Sh INTERFACE
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.Ss C structures
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.Bd -literal
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union ppb_insarg {
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int i;
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char c;
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void *p;
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int (* f)(void *, char *);
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};
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.Ed
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.Bd -literal
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struct ppb_microseq {
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int opcode; /* microins. opcode */
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union ppb_insarg arg[PPB_MS_MAXARGS]; /* arguments */
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};
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.Ed
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.Ss Using microsequences
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.Pp
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To instanciate a microsequence, just declare an array of ppb_microseq
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structures and initialize it as needed. You may either use defined macros
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or code directly your microinstructions according to the ppb_microseq
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definition. For example,
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.Bd -literal
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struct ppb_microseq select_microseq[] = {
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/* parameter list
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*/
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#define SELECT_TARGET MS_PARAM(0, 1, MS_TYP_INT)
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#define SELECT_INITIATOR MS_PARAM(3, 1, MS_TYP_INT)
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/* send the select command to the drive */
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MS_DASS(MS_UNKNOWN),
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MS_CASS(H_nAUTO | H_nSELIN | H_INIT | H_STROBE),
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MS_CASS( H_AUTO | H_nSELIN | H_INIT | H_STROBE),
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MS_DASS(MS_UNKNOWN),
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MS_CASS( H_AUTO | H_nSELIN | H_nINIT | H_STROBE),
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/* now, wait until the drive is ready */
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MS_SET(VP0_SELTMO),
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/* loop: */ MS_BRSET(H_ACK, 3 /* ready */),
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MS_DBRA(-1 /* loop */),
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/* error: */ MS_RET(1),
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/* ready: */ MS_RET(0)
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};
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.Ed
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.Pp
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Here, some parameters are undefined and must be filled before executing
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the microsequence. In order to initialize seach a microsequence, one should
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use the ppb_MS_init_msq() function like this:
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.Bd -literal
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ppb_MS_init_msq(select_microseq, 2,
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SELECT_TARGET, 1 << target,
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SELECT_INITIATOR, 1 << initiator);
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.Ed
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.Pp
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and then execute the microsequence.
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.Ss The microsequencer
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The microsequencer is executed either at ppbus or adapter level (see
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.Xr ppbus 4
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for info about ppbus system layers).
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.Sh SEE ALSO
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.Xr ppbus 4
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.Sh HISTORY
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The
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.Nm
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manual page first appeared in
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.Fx 3.0 .
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.Sh AUTHOR
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This
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manual page was written by
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.An Nicolas Souchu .
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