14 files changed, 4340 insertions, 0 deletions

diff --git a/sys/gnu/misc/aic7770/COPYING b/sys/gnu/misc/aic7770/COPYING
new file mode 100644
index 0000000000000..a43ea2126fb6b
--- /dev/null
+++ b/sys/gnu/misc/aic7770/COPYING
@@ -0,0 +1,339 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                          675 Mass Ave, Cambridge, MA 02139, USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+
+  To protect your rights, we need to make restrictions that forbid
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+These restrictions translate to certain responsibilities for you if you
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+
+  For example, if you distribute copies of such a program, whether
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+
+  We protect your rights with two steps: (1) copyright the software, and
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+
+  Also, for each author's protection and ours, we want to make certain
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+
+  Finally, any free program is threatened constantly by software
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+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+language.  (Hereinafter, translation is included without limitation in
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+
+Activities other than copying, distribution and modification are not
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+is covered only if its contents constitute a work based on the
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+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
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+
+You may charge a fee for the physical act of transferring a copy, and
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+  2. You may modify your copy or copies of the Program or any portion
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+
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+
+    c) If the modified program normally reads commands interactively
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+
+These requirements apply to the modified work as a whole.  If
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+In addition, mere aggregation of another work not based on the Program
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+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
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+
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+If any portion of this section is held invalid or unenforceable under
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+
+It is not the purpose of this section to induce you to infringe any
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+
+This section is intended to make thoroughly clear what is believed to
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+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
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+
+  9. The Free Software Foundation may publish revised and/or new versions
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+
+Each version is given a distinguishing version number.  If the Program
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+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
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+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
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+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
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+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	Appendix: How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) 19yy  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) 19yy name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/sys/gnu/misc/aic7770/COPYRIGHT b/sys/gnu/misc/aic7770/COPYRIGHT
new file mode 100644
index 0000000000000..905285da67595
--- /dev/null
+++ b/sys/gnu/misc/aic7770/COPYRIGHT
@@ -0,0 +1,16 @@
+Adaptec 274x device driver for Linux.
+Copyright (c) 1994 The University of Calgary Department of Computer Science.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
diff --git a/sys/gnu/misc/aic7770/README b/sys/gnu/misc/aic7770/README
new file mode 100644
index 0000000000000..1e4e5a011a697
--- /dev/null
+++ b/sys/gnu/misc/aic7770/README
@@ -0,0 +1,94 @@
+@(#)README 1.16 94/11/09 jda
+
+AHA274x/284x DRIVER
+
+***  THIS SHOULD BE CONSIDERED BETA SOFTWARE  ***
+
+BACKGROUND & LIMITATIONS
+
+For various reasons, we ended up with one of these cards under the
+impression that support was soon forthcoming.  In mid-May, I asked
+Scott Ferris (the official person who's supposed to be writing this
+driver) what documentation he used, _finally_ got it from Adaptec,
+and started writing this driver.  It is now at what I would consider
+a stable state - it runs our news server and is battered by SCSI
+requests 24 hours a day without dying.  There are a few devices it
+reportedly doesn't like working with - those are being sorted out.  Due
+to some unexpected equipment loans, I am able to support this at least
+for the time being.
+
+YOU MUST HAVE THE BIOS ENABLED OR THIS WILL NOT WORK.  The BIOS extracts
+some configuration information that I cannot get to portably yet, as
+well as provides some self-tests which this driver does not attempt to
+duplicate.
+
+Scott's driver development is stalled for now, and after discussions
+with him, this is now officially out of "pre-alpha" status and into
+beta until the remaining device problems can be resolved.  The latest
+patches can be obtained via anonymous ftp from ftp.cpsc.ucalgary.ca in
+/pub/systems/linux/aha274x.
+
+It supports both EISA 274x and VL-bus 284x, either single or twin-bus cards
+(but not the second SCSI bus of twin cards - see aha274x.c), and supports
+disconnection, synchronous SCSI, and scatter-gather.  Unlike previous
+versions, abort() and reset() are now implemented, and both hosts.c and
+aha274x.c should give a clean compile.  Code is now present to detect parity
+errors, but has not been tested.
+
+I wrote this using a 1.0.9 kernel.  Unfortunately, I'm getting tired of
+#ifdef'ing everything to handle two or three different evolutionary steps
+in the SCSI kernel code, so I've upgraded my system to 1.1.49, and will
+only leave in code to support versions from about 1.1.45 onward.
+
+Thanks to patches supplied by Mark Olson <molson@tricord.com>, this driver
+will now work with the 284x series (the VL-bus version of this card).  The
+294x (PCI-bus) support is based on patches sent to me by Mark Olson and
+Alan Hourihane <alanh@fairlite.demon.co.uk>.
+
+Under protest, this driver is subject to the GPL - see the file
+COPYING for details.
+
+Thanks to the following people for bug fixes/code improvements (also
+thanks to the people who have sent me feedback):
+
+	"David F. Carlson" <dave@ee.rochester.edu>
+	Jimen Ching <jiching@wiliki.eng.hawaii.edu>
+	mday@artisoft.com (Matt Day)
+	"Dean W. Gehnert" <deang@ims.com>
+	Darcy Grant <darcy@cpsc.ucalgary.ca>
+	Alan Hourihane <alanh@fairlite.demon.co.uk>
+	isely@fncrd8.fnal.gov (Mike Isely)
+	Mike Jerger <jerger@ux1.cso.uiuc.edu>
+	tm@netcom.com (Toshiyasu Morita)
+	neal@interact.org (Neal Norwitz)
+	Mark Olson <molson@tricord.com>
+	map@europa.ecn.uoknor.edu (Michael A. Parker)
+	Thomas Scheunemann <thomas@dagobert.uni-duisburg.de>
+
+Special thanks to Drew Eckhardt <drew@kinglear.cs.Colorado.EDU> for
+fielding my questions about synchronous negotiation.  Steffen Moeller
+<smoe0024@rz.uni-hildesheim.de> sent me installation instructions which
+were previously included in this README.
+
+David Pirie <pirie@cpsc.ucalgary.ca> was nice enough to loan me his
+2842 card for a week so I could track down one bug, as well as his
+CD-ROM drive later, and also thanks to Doug Fortune at Riley's Data Share
+in Calgary, who arranged a long-term loan of a 2842 board for further work.
+
+Many thanks to the fearless prerelease testers!  Dean Gehnert has been
+building Slackware boot disks for the driver, which are available from
+ftp.cpsc.ucalgary.ca in /pub/systems/linux/aha274x/slackware_boot.
+
+Carl Riches <cgr@poplar1.cfr.washington.edu> has set up a mailing list
+for aic7xxx driver development.  To subscribe, send a message to
+aic7770-list@poplar1.cfr.washington.edu with a message body of:
+
+    subscribe AIC7770-LIST <your name here, without the angle brackets>
+
+Please direct questions and discussions to that list instead of me.  When
+sending bug reports, please include a description of your hardware, the
+release numbers displayed by the driver at boot time, and as accurate a
+facsimilie of any error message you're mailing about.
+
+John Aycock
+aycock@cpsc.ucalgary.ca
diff --git a/sys/gnu/misc/aic7770/README-FIRST b/sys/gnu/misc/aic7770/README-FIRST
new file mode 100644
index 0000000000000..056dbc82cd614
--- /dev/null
+++ b/sys/gnu/misc/aic7770/README-FIRST
@@ -0,0 +1,19 @@
+This is VERY MUCH ALPHA SOFTWARE.  You MUST know what you're doing to
+use this, or else!!!
+
+Ok, everything's been renamed to reference an "aic7xxx" driver instead
+of "aha274x", and a merger of the two PCI patches I had has been put in,
+along with re-doing the detection and configuration routines.  To summarize
+the status: it compiles cleanly.  I don't expect it to work off the bat,
+but it's for the 294x development people to synchronize their code
+together.
+
+The file scsi-diffs-1.1.59 is NOT a proper patch file, but some diffs
+to kernel files concatenated together.  I've sent these off to Drew,
+but if you're testing this you'll have to apply them - it allows a
+per-driver-instance can_queue variable, which for the aic7xxx driver
+is the number of SCBs the card supports.
+
+Good luck!  I await your comments.. Mark, Alan - let me know where I
+broke it, please ;-)
+:ja
diff --git a/sys/gnu/misc/aic7770/aic7770.1 b/sys/gnu/misc/aic7770/aic7770.1
new file mode 100644
index 0000000000000..2009f8c7ad6ec
--- /dev/null
+++ b/sys/gnu/misc/aic7770/aic7770.1
@@ -0,0 +1,54 @@
+.\" Copyright (c) 1994
+.\"	Justin T. Gibbs.  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 Justin T. Gibbs.
+.\" 4. The name of Justin T. Gibbs may not be used to endorse or promote 
+.\"    products derived from this software without specific prior written 
+.\"    permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY JUSTIN T. GIBBS ``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.
+.\"
+.\"     @(#)aic7770.1	11/15/94
+.\"
+.Dd November 11, 1994
+.Dt AIC7770 1
+.Os BSD 4
+.Sh NAME
+.Nm aic7770
+.Nd aic7770 SCSI controller assembler
+.Sh SYNOPSIS
+.Nm aic7770
+.Op Fl o destination
+.Ar source-file
+.Sh DESCRIPTION
+.Ar Source-file
+is a file containing Aic7770 compatible assembly code.  The output of the
+assembler defaults to 
+.Ar a.out
+but can be optionally redirected to
+.Ar destination.
+.Pp
+.Sh AUTHOR
+This aic7770 compiler was written by John Aycock (aycock@cpsc.ucalgary.ca) and
+is subject to the GNU Public License.
+
diff --git a/sys/gnu/misc/aic7770/aic7770.c b/sys/gnu/misc/aic7770/aic7770.c
new file mode 100644
index 0000000000000..417a352762d31
--- /dev/null
+++ b/sys/gnu/misc/aic7770/aic7770.c
@@ -0,0 +1,584 @@
+/*
+ * Adaptec 274x device driver for Linux.
+ * Copyright (c) 1994 The University of Calgary Department of Computer Science.
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  Comments are started by `#' and continue to the end of the line; lines
+ *  may be of the form:
+ *
+ *	<label>*
+ *	<label>*  <undef-sym> = <value>
+ *	<label>*  <opcode> <operand>*
+ *
+ *  A <label> is an <undef-sym> ending in a colon.  Spaces, tabs, and commas
+ *  are token separators.
+ */
+
+/* #define _POSIX_SOURCE	1 */
+#define _POSIX_C_SOURCE	2
+
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define MEMORY		512		/* 2^9 29-bit words */
+#define MAXLINE		1024
+#define MAXTOKEN	32
+#define ADOTOUT		"a.out"
+#define NOVALUE		-1
+
+/*
+ *  AIC-7770 register definitions
+ */
+#define R_SINDEX	0x65
+#define R_ALLONES	0x69
+#define R_ALLZEROS	0x6a
+#define R_NONE		0x6a
+
+static
+char sccsid[] =
+    "@(#)aic7770.c 1.10 94/07/22 jda";
+
+int debug;
+int lineno, LC;
+char *filename;
+FILE *ifp, *ofp;
+unsigned char M[MEMORY][4];
+
+void error(char *s)
+{
+	fprintf(stderr, "%s: %s at line %d\n", filename, s, lineno);
+	exit(EXIT_FAILURE);
+}
+
+void *Malloc(size_t size)
+{
+	void *p = malloc(size);
+	if (!p)
+		error("out of memory");
+	return(p);
+}
+
+void *Realloc(void *ptr, size_t size)
+{
+	void *p = realloc(ptr, size);
+	if (!p)
+		error("out of memory");
+	return(p);
+}
+
+char *Strdup(char *s)
+{
+	char *p = (char *)Malloc(strlen(s) + 1);
+	strcpy(p, s);
+	return(p);
+}
+
+typedef struct sym_t {
+	struct sym_t *next;		/* MUST BE FIRST */
+	char *name;
+	int value;
+	int npatch, *patch;
+} sym_t;
+
+sym_t *head;
+
+void define(char *name, int value)
+{
+	sym_t *p, *q;
+
+	for (p = head, q = (sym_t *)&head; p; p = p->next) {
+		if (!strcmp(p->name, name))
+			error("redefined symbol");
+		q = p;
+	}
+
+	p = q->next = (sym_t *)Malloc(sizeof(sym_t));
+	p->next = NULL;
+	p->name = Strdup(name);
+	p->value = value;
+	p->npatch = 0;
+	p->patch = NULL;
+
+	if (debug) {
+		fprintf(stderr, "\"%s\" ", p->name);
+		if (p->value != NOVALUE)
+			fprintf(stderr, "defined as 0x%x\n", p->value);
+		else
+			fprintf(stderr, "undefined\n");
+	}
+}
+
+sym_t *lookup(char *name)
+{
+	sym_t *p;
+
+	for (p = head; p; p = p->next)
+		if (!strcmp(p->name, name))
+			return(p);
+	return(NULL);
+}
+
+void patch(sym_t *p, int location)
+{
+	p->npatch += 1;
+	p->patch = (int *)Realloc(p->patch, p->npatch * sizeof(int *));
+
+	p->patch[p->npatch - 1] = location;
+}
+
+void backpatch(void)
+{
+	int i;
+	sym_t *p;
+
+	for (p = head; p; p = p->next) {
+
+		if (p->value == NOVALUE) {
+			fprintf(stderr,
+				"%s: undefined symbol \"%s\"\n",
+				filename, p->name);
+			exit(EXIT_FAILURE);
+		}
+
+		if (p->npatch) {
+			if (debug)
+				fprintf(stderr,
+					"\"%s\" (0x%x) patched at",
+					p->name, p->value);
+
+			for (i = 0; i < p->npatch; i++) {
+				M[p->patch[i]][0] &= ~1;
+				M[p->patch[i]][0] |= ((p->value >> 8) & 1);
+				M[p->patch[i]][1] = p->value & 0xff;
+
+				if (debug)
+					fprintf(stderr, " 0x%x", p->patch[i]);
+			}
+
+			if (debug)
+				fputc('\n', stderr);
+		}
+	}
+}
+
+/*
+ *  Output words in byte-reversed order (least significant first)
+ *  since the sequencer RAM is loaded that way.
+ */
+void output(FILE *fp)
+{
+	int i;
+
+	for (i = 0; i < LC; i++)
+		fprintf(fp, "\t0x%02x, 0x%02x, 0x%02x, 0x%02x,\n",
+			M[i][3],
+			M[i][2],
+			M[i][1],
+			M[i][0]);
+}
+
+char **getl(int *n)
+{
+	int i;
+	char *p;
+	static char buf[MAXLINE];
+	static char *a[MAXTOKEN];
+
+	i = 0;
+
+	while (fgets(buf, sizeof(buf), ifp)) {
+
+		lineno += 1;
+
+		if (buf[strlen(buf)-1] != '\n')
+			error("line too long");
+
+		p = strchr(buf, '#');
+		if (p)
+			*p = '\0';
+
+		for (p = strtok(buf, ", \t\n"); p; p = strtok(NULL, ", \t\n"))
+			if (i < MAXTOKEN-1)
+				a[i++] = p;
+			else
+				error("too many tokens");
+		if (i) {
+			*n = i;
+			return(a);
+		}
+	}
+	return(NULL);
+}
+
+#define A	0x8000		/* `A'ccumulator ok */
+#define I	0x4000		/* use as immediate value */
+#define SL	0x2000		/* shift left */
+#define SR	0x1000		/* shift right */
+#define RL	0x0800		/* rotate left */
+#define RR	0x0400		/* rotate right */
+#define LO	0x8000		/* lookup: ori-{jmp,jc,jnc,call} */
+#define LA	0x4000		/* lookup: and-{jz,jnz} */
+#define LX	0x2000		/* lookup: xor-{je,jne} */
+#define NA	-1		/* not applicable */
+
+struct {
+	char *name;
+	int n;			/* number of operands, including opcode */
+	unsigned int op;	/* immediate or L?|pos_from_0 */
+	unsigned int dest;	/* NA, pos_from_0, or I|immediate */
+	unsigned int src;	/* NA, pos_from_0, or I|immediate */
+	unsigned int imm;	/* pos_from_0, A|pos_from_0, or I|immediate */
+	unsigned int addr;	/* NA or pos_from_0 */
+	int fmt;		/* instruction format - 1, 2, or 3 */
+} instr[] = {
+/*
+ *		N  OP	 DEST		SRC		IMM	ADDR FMT
+ */
+	"mov",	3, 1,	 1,		2,		I|0xff,	NA,  1,
+	"mov",	4, LO|2, NA,		1,		I|0,	3,   3,
+	"mvi",	3, 0,	 1,		I|R_ALLZEROS,	A|2,	NA,  1,
+	"mvi",	4, LO|2, NA,		I|R_ALLZEROS,	1,	3,   3,
+	"not",	2, 2,	 1,		1,		I|0xff,	NA,  1,
+	"not",	3, 2,	 1,		2,		I|0xff,	NA,  1,
+	"and",	3, 1,	 1,		1,		A|2,	NA,  1,
+	"and",  4, 1,	 1,		3,		A|2,	NA,  1,
+	"or",	3, 0,	 1,		1,		A|2,	NA,  1,
+	"or",	4, 0,	 1,		3,		A|2,	NA,  1,
+	"or",	5, LO|3, NA,		1,		2,	4,   3,
+	"xor",	3, 2,	 1,		1,		A|2,	NA,  1,
+	"xor",	4, 2,	 1,		3,		A|2,	NA,  1,
+	"nop",	1, 1,	 I|R_NONE,	I|R_ALLZEROS,	I|0xff,	NA,  1,
+	"inc",	2, 3,	 1,		1,		I|1,	NA,  1,
+	"inc",	3, 3,	 1,		2,		I|1,	NA,  1,
+	"dec",	2, 3,	 1,		1,		I|0xff,	NA,  1,
+	"dec",	3, 3,	 1,		2,		I|0xff,	NA,  1,
+	"jmp",	2, LO|0, NA,		I|R_SINDEX,	I|0,	1,   3,
+	"jc",	2, LO|0, NA,		I|R_SINDEX,	I|0,	1,   3,
+	"jnc",	2, LO|0, NA,		I|R_SINDEX,	I|0,	1,   3,
+	"call",	2, LO|0, NA,		I|R_SINDEX,	I|0,	1,   3,
+	"test",	5, LA|3, NA,		1,		A|2,	4,   3,
+	"cmp",	5, LX|3, NA,		1,		A|2,	4,   3,
+	"ret",	1, 1,	 I|R_NONE,	I|R_ALLZEROS,	I|0xff,	NA,  1,
+	"clc",	1, 3,	 I|R_NONE,	I|R_ALLZEROS,	I|1,	NA,  1,
+	"clc",	4, 3,	 2,		I|R_ALLZEROS,	A|3,	NA,  1,
+	"stc",	1, 3,	 I|R_NONE,	I|R_ALLONES,	I|1,	NA,  1,
+	"stc",	2, 3,	 1,		I|R_ALLONES,	I|1,	NA,  1,
+	"add",	3, 3,	 1,		1,		A|2,	NA,  1,
+	"add",	4, 3,	 1,		3,		A|2,	NA,  1,
+	"adc",	3, 4,	 1,		1,		A|2,	NA,  1,
+	"adc",	4, 4,	 1,		3,		A|2,	NA,  1,
+	"shl",	3, 5,	 1,		1,		SL|2,	NA,  2,
+	"shl",	4, 5,	 1,		2,		SL|3,	NA,  2,
+	"shr",	3, 5,	 1,		1,		SR|2,	NA,  2,
+	"shr",	4, 5,	 1,		2,		SR|3,	NA,  2,
+	"rol",	3, 5,	 1,		1,		RL|2,	NA,  2,
+	"rol",	4, 5,	 1,		2,		RL|3,	NA,  2,
+	"ror",	3, 5,	 1,		1,		RR|2,	NA,  2,
+	"ror",	4, 5,	 1,		2,		RR|3,	NA,  2,
+	/*
+	 *  Extensions (note also that mvi allows A)
+	 */
+ 	"clr",	2, 1,	 1,		I|R_ALLZEROS,	I|0xff,	NA,  1,
+	0
+};
+
+int eval_operand(char **a, int spec)
+{
+	int i;
+	unsigned int want = spec & (LO|LA|LX);
+
+	static struct {
+		unsigned int what;
+		char *name;
+		int value;
+	} jmptab[] = {
+		LO,	"jmp",		8,
+		LO,	"jc",		9,
+		LO,	"jnc",		10,
+		LO,	"call",		11,
+		LA,	"jz",		15,
+		LA,	"jnz",		13,
+		LX,	"je",		14,
+		LX,	"jne",		12,
+	};
+
+	spec &= ~(LO|LA|LX);
+
+	for (i = 0; i < sizeof(jmptab)/sizeof(jmptab[0]); i++)
+		if (jmptab[i].what == want &&
+		    !strcmp(jmptab[i].name, a[spec]))
+		{
+			return(jmptab[i].value);
+		}
+
+	if (want)
+		error("invalid jump");
+
+	return(spec);		/* "case 0" - no flags set */
+}
+
+int eval_sdi(char **a, int spec)
+{
+	sym_t *p;
+	unsigned val;
+
+	if (spec == NA)
+		return(NA);
+
+	switch (spec & (A|I|SL|SR|RL|RR)) {
+	    case SL:
+	    case SR:
+	    case RL:
+	    case RR:
+		if (isdigit(*a[spec &~ (SL|SR|RL|RR)]))
+			val = strtol(a[spec &~ (SL|SR|RL|RR)], NULL, 0);
+		else {
+			p = lookup(a[spec &~ (SL|SR|RL|RR)]);
+			if (!p)
+				error("undefined symbol used");
+			val = p->value;
+		}
+
+		switch (spec & (SL|SR|RL|RR)) {		/* blech */
+		    case SL:
+			if (val > 7)
+				return(0xf0);
+			return(((val % 8) << 4) |
+			       (val % 8));
+		    case SR:
+			if (val > 7)
+				return(0xf0);
+			return(((val % 8) << 4) |
+			       (1 << 3) |
+			       ((8 - (val % 8)) % 8));
+		    case RL:
+			return(val % 8);
+		    case RR:
+			return((8 - (val % 8)) % 8);
+		}
+	    case I:
+		return(spec &~ I);
+	    case A:
+		/*
+		 *  An immediate field of zero selects
+		 *  the accumulator.  Vigorously object
+		 *  if zero is given otherwise - it's
+		 *  most likely an error.
+		 */
+		spec &= ~A;
+		if (!strcmp("A", a[spec]))
+			return(0);
+		if (isdigit(*a[spec]) &&
+		    strtol(a[spec], NULL, 0) == 0)
+		{
+			error("immediate value of zero selects accumulator");
+		}
+		/* falls through */
+	    case 0:
+		if (isdigit(*a[spec]))
+			return(strtol(a[spec], NULL, 0));
+		p = lookup(a[spec]);
+		if (p)
+			return(p->value);
+		error("undefined symbol used");
+	}
+
+	return(NA);		/* shut the compiler up */
+}
+
+int eval_addr(char **a, int spec)
+{
+	sym_t *p;
+
+	if (spec == NA)
+		return(NA);
+	if (isdigit(*a[spec]))
+		return(strtol(a[spec], NULL, 0));
+
+	p = lookup(a[spec]);
+
+	if (p) {
+		if (p->value != NOVALUE)
+			return(p->value);
+		patch(p, LC);
+	} else {
+		define(a[spec], NOVALUE);
+		p = lookup(a[spec]);
+		patch(p, LC);
+	}
+
+	return(NA);		/* will be patched in later */
+}
+
+int crack(char **a, int n)
+{
+	int i;
+	int I_imm, I_addr;
+	int I_op, I_dest, I_src, I_ret;
+
+	/*
+	 *  Check for "ret" at the end of the line; remove
+	 *  it unless it's "ret" alone - we still want to
+	 *  look it up in the table.
+	 */
+	I_ret = (strcmp(a[n-1], "ret") ? 0 : !0);
+	if (I_ret && n > 1)
+		n -= 1;
+
+	for (i = 0; instr[i].name; i++) {
+		/*
+		 *  Look for match in table given constraints,
+		 *  currently just the name and the number of
+		 *  operands.
+		 */
+		if (!strcmp(instr[i].name, *a) && instr[i].n == n)
+			break;
+	}
+	if (!instr[i].name)
+		error("unknown opcode or wrong number of operands");
+
+	I_op	= eval_operand(a, instr[i].op);
+	I_src	= eval_sdi(a, instr[i].src);
+	I_imm	= eval_sdi(a, instr[i].imm);
+	I_dest	= eval_sdi(a, instr[i].dest);
+	I_addr	= eval_addr(a, instr[i].addr);
+
+	switch (instr[i].fmt) {
+	    case 1:
+	    case 2:
+		M[LC][0] = (I_op << 1) | I_ret;
+		M[LC][1] = I_dest;
+		M[LC][2] = I_src;
+		M[LC][3] = I_imm;
+		break;
+	    case 3:
+		if (I_ret)
+			error("illegal use of \"ret\"");
+		M[LC][0] = (I_op << 1) | ((I_addr >> 8) & 1);
+		M[LC][1] = I_addr & 0xff;
+		M[LC][2] = I_src;
+		M[LC][3] = I_imm;
+		break;
+	}
+
+	return(1);		/* no two-byte instructions yet */
+}
+
+#undef SL
+#undef SR
+#undef RL
+#undef RR
+#undef LX
+#undef LA
+#undef LO
+#undef I
+#undef A
+
+void assemble(void)
+{
+	int n;
+	char **a;
+	sym_t *p;
+
+	while ((a = getl(&n))) {
+
+		while (a[0][strlen(*a)-1] == ':') {
+			a[0][strlen(*a)-1] = '\0';
+			p = lookup(*a);
+			if (p)
+				p->value = LC;
+			else
+				define(*a, LC);
+			a += 1;
+			n -= 1;
+		}
+
+		if (!n)			/* line was all labels */
+			continue;
+
+		if (n == 3 && !strcmp("VERSION", *a))
+			fprintf(ofp, "#define %s \"%s\"\n", a[1], a[2]);
+		else {
+			if (n == 3 && !strcmp("=", a[1]))
+				define(*a, strtol(a[2], NULL, 0));
+			else
+				LC += crack(a, n);
+		}
+	}
+
+	backpatch();
+	output(ofp);
+
+	if (debug)
+		output(stderr);
+}
+
+int main(int argc, char **argv)
+{
+	int c;
+
+	while ((c = getopt(argc, argv, "dho:")) != EOF) {
+		switch (c) {
+		    case 'd':
+			debug = !0;
+			break;
+		    case 'o':
+		        ofp = fopen(optarg, "w");
+			if (!ofp) {
+				perror(optarg);
+				exit(EXIT_FAILURE);
+			}
+			break;
+		    case 'h':
+			printf("usage: %s [-d] [-ooutput] input\n", *argv);
+			exit(EXIT_SUCCESS);
+		    case NULL:
+			/*
+			 *  An impossible option to shut the compiler
+			 *  up about sccsid[].
+			 */
+			exit((int)sccsid);
+		    default:
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	if (argc - optind != 1) {
+		fprintf(stderr, "%s: must have one input file\n", *argv);
+		exit(EXIT_FAILURE);
+	}
+	filename = argv[optind];
+
+	ifp = fopen(filename, "r");
+	if (!ifp) {
+		perror(filename);
+		exit(EXIT_FAILURE);
+	}
+
+	if (!ofp) {
+		ofp = fopen(ADOTOUT, "w");
+		if (!ofp) {
+			perror(ADOTOUT);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	assemble();
+	exit(EXIT_SUCCESS);
+}
diff --git a/sys/gnu/misc/aic7770/aic7770.seq b/sys/gnu/misc/aic7770/aic7770.seq
new file mode 100644
index 0000000000000..9b83b84f5472d
--- /dev/null
+++ b/sys/gnu/misc/aic7770/aic7770.seq
@@ -0,0 +1,1064 @@
+# @(#)aic7xxx.seq 1.30 94/11/09 jda
+#
+# Adaptec 274x device driver for Linux.
+# Copyright (c) 1994 The University of Calgary Department of Computer Science.
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+VERSION AIC7XXX_SEQ_VERSION 1.30
+
+MAXSCB-1	= 0xf
+
+SCSISEQ		= 0x00
+SXFRCTL0	= 0x01
+SXFRCTL1	= 0x02
+SCSISIGI	= 0x03
+SCSISIGO	= 0x03
+SCSIRATE	= 0x04
+SCSIID		= 0x05
+SCSIDATL	= 0x06
+STCNT		= 0x08
+STCNT+0		= 0x08
+STCNT+1		= 0x09
+STCNT+2		= 0x0a
+SSTAT0		= 0x0b
+CLRSINT1	= 0x0c
+SSTAT1		= 0x0c
+SIMODE1		= 0x11
+SCSIBUSL	= 0x12
+SHADDR		= 0x14
+SELID		= 0x19
+SBLKCTL		= 0x1f
+SEQCTL		= 0x60
+A		= 0x64				# == ACCUM
+SINDEX		= 0x65
+DINDEX		= 0x66
+ALLZEROS	= 0x6a
+NONE		= 0x6a
+SINDIR		= 0x6c
+DINDIR		= 0x6d
+FUNCTION1	= 0x6e
+HADDR		= 0x88
+HCNT		= 0x8c
+HCNT+0		= 0x8c
+HCNT+1		= 0x8d
+HCNT+2		= 0x8e
+SCBPTR		= 0x90
+INTSTAT		= 0x91
+DFCNTRL		= 0x93
+DFSTATUS	= 0x94
+DFDAT		= 0x99
+QINFIFO		= 0x9b
+QINCNT		= 0x9c
+QOUTFIFO	= 0x9d
+
+SCSICONF	= 0x5a
+
+#  The two reserved bytes at SCBARRAY+1[23] are expected to be set to
+#  zero, and the reserved bit in SCBARRAY+0 is used as an internal flag
+#  to indicate whether or not to reload scatter-gather parameters after
+#  a disconnect.
+#
+SCBARRAY+0	= 0xa0
+SCBARRAY+1	= 0xa1
+SCBARRAY+2	= 0xa2
+SCBARRAY+3	= 0xa3
+SCBARRAY+7	= 0xa7
+SCBARRAY+11	= 0xab
+SCBARRAY+14	= 0xae
+SCBARRAY+15	= 0xaf
+SCBARRAY+16	= 0xb0
+SCBARRAY+17	= 0xb1
+SCBARRAY+18	= 0xb2
+SCBARRAY+19	= 0xb3
+SCBARRAY+20	= 0xb4
+SCBARRAY+21	= 0xb5
+SCBARRAY+22	= 0xb6
+SCBARRAY+23	= 0xb7
+SCBARRAY+24	= 0xb8
+SCBARRAY+25	= 0xb9
+
+SIGNAL_0	= 0x01				# unknown scsi bus phase
+SIGNAL_1	= 0x11				# message reject
+SIGNAL_2	= 0x21				# no IDENTIFY after reconnect
+SIGNAL_3	= 0x31				# no cmd match for reconnect
+SIGNAL_4	= 0x41				# SDTR -> SCSIRATE conversion
+STATUS_ERROR    = 0x51
+
+#  The host adapter card (at least the BIOS) uses 20-2f for SCSI
+#  device information, 32-33 and 5a-5f as well.  Since we don't support
+#  wide or twin-bus SCSI, 28-2f can be reclaimed.  As it turns out, the
+#  BIOS trashes 20-27 anyway, writing the synchronous negotiation results
+#  on top of the BIOS values, so we re-use those for our per-target
+#  scratchspace (actually a value that can be copied directly into
+#  SCSIRATE).  This implies, since we can't get the BIOS config values,
+#  that all targets will be negotiated with for synchronous transfer.
+#  NEEDSDTR has one bit per target indicating if an SDTR message is
+#  needed for that device - this will be set initially, as well as
+#  after a bus reset condition.
+#
+#  The high bit of DROPATN is set if ATN should be dropped before the ACK
+#  when outb is called.  REJBYTE contains the first byte of a MESSAGE IN
+#  message, so the driver can report an intelligible error if a message is
+#  rejected.
+#
+#  RESELECT's high bit is true if we are currently handling a reselect;
+#  its next-highest bit is true ONLY IF we've seen an IDENTIFY message
+#  from the reselecting target.  If we haven't had IDENTIFY, then we have
+#  no idea what the lun is, and we can't select the right SCB register
+#  bank, so force a kernel panic if the target attempts a data in/out or
+#  command phase instead of corrupting something.
+#
+#  Note that SG_NEXT occupies four bytes.
+#
+SYNCNEG		= 0x20
+DISC_DSB_A	= 0x32
+
+DROPATN		= 0x30
+REJBYTE		= 0x31
+RESELECT	= 0x34
+
+MSG_FLAGS	= 0x35
+MSG_LEN		= 0x36
+MSG_START+0	= 0x37
+MSG_START+1	= 0x38
+MSG_START+2	= 0x39
+MSG_START+3	= 0x3a
+MSG_START+4	= 0x3b
+MSG_START+5	= 0x3c
+-MSG_START+0	= 0xc9				# 2's complement of MSG_START+0
+
+ARG_1		= 0x4c				# sdtr conversion args & return
+ARG_2		= 0x4d
+RETURN_1	= 0x4c
+
+SIGSTATE	= 0x4e				# value written to SCSISIGO
+NEEDSDTR	= 0x4f				# send SDTR message, 1 bit/trgt
+
+SG_SIZEOF	= 0x8 				# sizeof(struct scatterlist)
+SG_NOLOAD	= 0x50				# load SG pointer/length?
+SG_COUNT	= 0x51				# working value of SG count
+SG_NEXT		= 0x52				# working value of SG pointer
+SG_NEXT+0	= 0x52
+SG_NEXT+1	= 0x53
+SG_NEXT+2	= 0x54
+SG_NEXT+3	= 0x55
+
+SCBCOUNT	= 0x56				# the actual number of SCBs
+ACTIVE_A	= 0x57
+
+#  Poll QINCNT for work - the lower three bits contain
+#  the number of entries in the Queue In FIFO.
+#
+start:
+	test	SCSISIGI,0x4	jnz reselect	# BSYI
+	test	QINCNT,MAXSCB-1	jz start
+
+#  We have at least one queued SCB now.  Set the SCB pointer
+#  from the FIFO so we see the right bank of SCB registers,
+#  then set SCSI options and set the initiator and target
+#  SCSI IDs.
+#
+	mov	SCBPTR,QINFIFO
+
+# See if there is not already an active SCB for this target.  This code
+# will have to be modified when we add support for dual and wide busses.
+
+	and	FUNCTION1,0x70,SCBARRAY+1
+	mov	A,FUNCTION1
+	test	ACTIVE_A,A      jz active  
+# Place the currently active back on the queue for later processing
+	mov	QINFIFO, SCBPTR
+	jmp	start
+
+# Mark the current target as busy and get working on the SCB
+active:
+	or	ACTIVE_A,A
+	mov	SCBARRAY+1	call initialize
+	clr	SG_NOLOAD
+	clr	RESELECT
+
+#  As soon as we get a successful selection, the target should go
+#  into the message out phase since we have ATN asserted.  Prepare
+#  the message to send, locking out the device driver.  If the device
+#  driver hasn't beaten us with an ABORT or RESET message, then tack
+#  on a SDTR negotation if required.
+#
+#  Messages are stored in scratch RAM starting with a flag byte (high bit
+#  set means active message), one length byte, and then the message itself.
+#
+	mov	SCBARRAY+1	call disconnect	# disconnect ok?
+
+	and	SINDEX,0x7,SCBARRAY+1		# lun
+	or	SINDEX,A			# return value from disconnect
+	or	SINDEX,0x80	call mk_mesg	# IDENTIFY message
+
+	mov	A,SINDEX
+	cmp	MSG_START+0,A	jne !message	# did driver beat us?
+	mvi	MSG_START+1	call mk_sdtr	# build SDTR message if needed
+
+!message:
+
+#  Enable selection phase as an initiator, and do automatic ATN
+#  after the selection.
+#
+	mvi	SCSISEQ,0x48			# ENSELO|ENAUTOATNO
+
+#  Wait for successful arbitration.  The AIC-7770 documentation says
+#  that SELINGO indicates successful arbitration, and that it should
+#  be used to look for SELDO.  However, if the sequencer is paused at
+#  just the right time - a parallel fsck(8) on two drives did it for
+#  me - then SELINGO can flip back to false before we've seen it.  This
+#  makes the sequencer sit in the arbitration loop forever.  This is
+#  Not Good.
+#
+#  Therefore, I've added a check in the arbitration loop for SELDO
+#  too.  This could arguably be made a critical section by disabling
+#  pauses, but I don't want to make a potentially infinite loop a CS.
+#  I suppose you could fold it into the select loop, too, but since
+#  I've been hunting this bug for four days it's kinda like a trophy.
+#
+arbitrate:
+	test	SSTAT0,0x40	jnz *select	# SELDO
+	test	SSTAT0,0x10	jz arbitrate	# SELINGO
+
+#  Wait for a successful selection.  If the hardware selection
+#  timer goes off, then the driver gets the interrupt, so we don't
+#  need to worry about it.
+#
+select:
+	test	SSTAT0,0x40	jz select	# SELDO
+	jmp	*select
+
+#  Reselection is being initiated by a target - we've seen the BSY
+#  line driven active, and we didn't do it!  Enable the reselection
+#  hardware, and wait for it to finish.  Make a note that we've been
+#  reselected, but haven't seen an IDENTIFY message from the target
+#  yet.
+#
+reselect:
+	mvi	SCSISEQ,0x10			# ENRSELI
+
+reselect1:
+	test	SSTAT0,0x20	jz reselect1	# SELDI
+	mov	SELID		call initialize
+
+	mvi	RESELECT,0x80			# reselected, no IDENTIFY
+
+#  After the [re]selection, make sure that the [re]selection enable
+#  bit is off.  This chip is flaky enough without extra things
+#  turned on.  Also clear the BUSFREE bit in SSTAT1 since we'll be
+#  using it shortly.
+#
+*select:
+	clr	SCSISEQ
+	mvi	CLRSINT1,0x8			# CLRBUSFREE
+
+#  Main loop for information transfer phases.  If BSY is false, then
+#  we have a bus free condition, expected or not.  Otherwise, wait
+#  for the target to assert REQ before checking MSG, C/D and I/O
+#  for the bus phase.
+#
+#  We can't simply look at the values of SCSISIGI here (if we want
+#  to do synchronous data transfer), because the target won't assert
+#  REQ if it's already sent us some data that we haven't acknowledged
+#  yet.
+#
+ITloop:
+	test	SSTAT1,0x8	jnz p_busfree	# BUSFREE
+	test	SSTAT1,0x1	jz ITloop	# REQINIT
+
+	and	A,0xe0,SCSISIGI			# CDI|IOI|MSGI
+
+	cmp	ALLZEROS,A	je p_dataout
+	cmp	A,0x40		je p_datain
+	cmp	A,0x80		je p_command
+	cmp	A,0xc0		je p_status
+	cmp	A,0xa0		je p_mesgout
+	cmp	A,0xe0		je p_mesgin
+
+	mvi	INTSTAT,SIGNAL_0		# unknown - signal driver
+
+p_dataout:
+	mvi	0		call scsisig	# !CDO|!IOO|!MSGO
+	call	assert
+	call	sg_load
+
+	mvi	A,3
+	mvi	DINDEX,HCNT
+	mvi	SCBARRAY+23	call bcopy
+
+	mvi	A,3
+	mvi	DINDEX,STCNT
+	mvi	SCBARRAY+23	call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,HADDR
+	mvi	SCBARRAY+19	call bcopy
+
+	mvi	0x3d		call dma	# SCSIEN|SDMAEN|HDMAEN|
+						#   DIRECTION|FIFORESET
+
+#  After a DMA finishes, save the final transfer pointer and count
+#  back into the SCB, in case a device disconnects in the middle of
+#  a transfer.  Use SHADDR and STCNT instead of HADDR and HCNT, since
+#  it's a reflection of how many bytes were transferred on the SCSI
+#  (as opposed to the host) bus.
+#
+	mvi	A,3
+	mvi	DINDEX,SCBARRAY+23
+	mvi	STCNT		call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,SCBARRAY+19
+	mvi	SHADDR		call bcopy
+
+	call	sg_advance
+	mov	SCBARRAY+18,SG_COUNT		# residual S/G count
+
+	jmp	ITloop
+
+p_datain:
+	mvi	0x40		call scsisig	# !CDO|IOO|!MSGO
+	call	assert
+	call	sg_load
+
+	mvi	A,3
+	mvi	DINDEX,HCNT
+	mvi	SCBARRAY+23	call bcopy
+
+	mvi	A,3
+	mvi	DINDEX,STCNT
+	mvi	SCBARRAY+23	call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,HADDR
+	mvi	SCBARRAY+19	call bcopy
+
+	mvi	0x39		call dma	# SCSIEN|SDMAEN|HDMAEN|
+						#   !DIRECTION|FIFORESET
+	mvi	A,3
+	mvi	DINDEX,SCBARRAY+23
+	mvi	STCNT		call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,SCBARRAY+19
+	mvi	SHADDR		call bcopy
+
+	call	sg_advance
+	mov	SCBARRAY+18,SG_COUNT		# residual S/G count
+
+	jmp	ITloop
+
+#  Command phase.  Set up the DMA registers and let 'er rip - the
+#  two bytes after the SCB SCSI_cmd_length are zeroed by the driver,
+#  so we can copy those three bytes directly into HCNT.
+#
+p_command:
+	mvi	0x80		call scsisig	# CDO|!IOO|!MSGO
+	call	assert
+
+	mvi	A,3
+	mvi	DINDEX,HCNT
+	mvi	SCBARRAY+11	call bcopy
+
+	mvi	A,3
+	mvi	DINDEX,STCNT
+	mvi	SCBARRAY+11	call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,HADDR
+	mvi	SCBARRAY+7	call bcopy
+
+	mvi	0x3d		call dma	# SCSIEN|SDMAEN|HDMAEN|
+						#   DIRECTION|FIFORESET
+	jmp	ITloop
+
+#  Status phase.  Wait for the data byte to appear, then read it
+#  and store it into the SCB.
+#
+p_status:
+	mvi	0xc0		call scsisig	# CDO|IOO|!MSGO
+
+	mvi	SCBARRAY+14	call inb
+	jmp	ITloop
+
+#  Message out phase.  If there is no active message, but the target
+#  took us into this phase anyway, build a no-op message and send it.
+#
+p_mesgout:
+	mvi	0xa0		call scsisig	# CDO|!IOO|MSGO
+	mvi	0x8		call mk_mesg	# build NOP message
+
+#  Set up automatic PIO transfer from MSG_START.  Bit 3 in
+#  SXFRCTL0 (SPIOEN) is already on.
+#
+	mvi	SINDEX,MSG_START+0
+	mov	DINDEX,MSG_LEN
+	clr	A
+
+#  When target asks for a byte, drop ATN if it's the last one in
+#  the message.  Otherwise, keep going until the message is exhausted.
+#  (We can't use outb for this since it wants the input in SINDEX.)
+#
+#  Keep an eye out for a phase change, in case the target issues
+#  a MESSAGE REJECT.
+#
+p_mesgout2:
+	test	SSTAT0,0x2	jz p_mesgout2	# SPIORDY
+	test	SSTAT1,0x10	jnz p_mesgout6	# PHASEMIS
+
+	cmp	DINDEX,1	jne p_mesgout3	# last byte?
+	mvi	CLRSINT1,0x40			# CLRATNO - drop ATN
+
+#  Write a byte to the SCSI bus.  The AIC-7770 refuses to automatically
+#  send ACKs in automatic PIO or DMA mode unless you make sure that the
+#  "expected" bus phase in SCSISIGO matches the actual bus phase.  This
+#  behaviour is completely undocumented and caused me several days of
+#  grief.
+#
+#  After plugging in different drives to test with and using a longer
+#  SCSI cable, I found that I/O in Automatic PIO mode ceased to function,
+#  especially when transferring >1 byte.  It seems to be much more stable
+#  if STCNT is set to one before the transfer, and SDONE (in SSTAT0) is
+#  polled for transfer completion - for both output _and_ input.  The
+#  only theory I have is that SPIORDY doesn't drop right away when SCSIDATL
+#  is accessed (like the documentation says it does), and that on a longer
+#  cable run, the sequencer code was fast enough to loop back and see
+#  an SPIORDY that hadn't dropped yet.
+#
+p_mesgout3:
+	call	one_stcnt
+	mov	SCSIDATL,SINDIR
+
+p_mesgout4:
+	test	SSTAT0,0x4	jz p_mesgout4	# SDONE
+	dec	DINDEX
+	inc	A
+	cmp	MSG_LEN,A	jne p_mesgout2
+
+#  If the next bus phase after ATN drops is a message out, it means
+#  that the target is requesting that the last message(s) be resent.
+#
+p_mesgout5:
+	test	SSTAT1,0x8	jnz p_mesgout6	# BUSFREE
+	test	SSTAT1,0x1	jz p_mesgout5	# REQINIT
+
+	and	A,0xe0,SCSISIGI			# CDI|IOI|MSGI
+	cmp	A,0xa0		jne p_mesgout6
+	mvi	0x10		call scsisig	# ATNO - re-assert ATN
+
+	jmp	ITloop
+
+p_mesgout6:
+	mvi	CLRSINT1,0x40			# CLRATNO - in case of PHASEMIS
+	clr	MSG_FLAGS			# no active msg
+	jmp	ITloop
+
+#  Message in phase.  Bytes are read using Automatic PIO mode, but not
+#  using inb.  This alleviates a race condition, namely that if ATN had
+#  to be asserted under Automatic PIO mode, it had to beat the SCSI
+#  circuitry sending an ACK to the target.  This showed up under heavy
+#  loads and really confused things, since ABORT commands wouldn't be
+#  seen by the drive after an IDENTIFY message in until it had changed
+#  to a data I/O phase.
+#
+p_mesgin:
+	mvi	0xe0		call scsisig	# CDO|IOO|MSGO
+	mvi	A		call inb_first	# read the 1st message byte
+	mvi	REJBYTE,A			# save it for the driver
+
+	cmp	ALLZEROS,A	jne p_mesgin1
+
+#  We got a "command complete" message, so put the SCB pointer
+#  into the Queue Out, and trigger a completion interrupt.
+#  Check status for non zero return and interrupt driver if needed
+#  This allows the driver to do a sense command to find out the
+#  source of error.  We don't bother to post to the QOUTFIFO in
+#  the error case since it would require extra work in the kernel
+#  driver to ensure that the entry was removed before the command
+#  complete code tried processing it.
+
+#  First, mark this target as free.
+	and     FUNCTION1,0x70,SCBARRAY+1
+	mov	A,FUNCTION1
+	xor     ACTIVE_A,A 
+
+	test	SCBARRAY+14,0xff	jz status_ok  # 0 Status?
+	call	inb_last			# ack & turn auto PIO back on
+	mvi	INTSTAT,STATUS_ERROR		# let driver know
+	jmp	ITloop
+status_ok:
+	mov	QOUTFIFO,SCBPTR
+	mvi	INTSTAT,0x2			# CMDCMPLT
+	jmp	p_mesgin_done
+
+#  Is it an extended message?  We only support the synchronous data
+#  transfer request message, which will probably be in response to
+#  an SDTR message out from us.  If it's not an SDTR, reject it -
+#  apparently this can be done after any message in byte, according
+#  to the SCSI-2 spec.
+#
+#  XXX - we should really reject this if we didn't initiate the SDTR
+#	 negotiation; this may cause problems with unusual devices.
+#
+p_mesgin1:
+	cmp	A,1		jne p_mesgin2	# extended message code?
+	
+	mvi	A		call inb_next
+	cmp	A,3		jne p_mesginN	# extended mesg length = 3
+	mvi	A		call inb_next
+	cmp	A,1		jne p_mesginN	# SDTR code
+
+	mvi	ARG_1		call inb_next	# xfer period
+	mvi	ARG_2		call inb_next	# REQ/ACK offset
+	mvi	INTSTAT,SIGNAL_4		# call driver to convert
+
+	call	ndx_sdtr			# index sync config for target
+	mov	DINDEX,SINDEX
+	mov	DINDIR,RETURN_1			# save returned value
+
+	not	A				# turn off "need sdtr" flag
+	and	NEEDSDTR,A
+
+#  Even though the SCSI-2 specification says that a device responding
+#  to our SDTR message should honor our parameters for transmitting
+#  to us, it doesn't seem to work too well in real life.  In particular,
+#  a lot of CD-ROM and tape units don't function: try using the SDTR
+#  parameters the device sent us for both transmitting and receiving.
+#
+	mov	SCSIRATE,RETURN_1
+	jmp	p_mesgin_done
+
+#  Is it a disconnect message?  Set a flag in the SCB to remind us
+#  and await the bus going free.
+#
+p_mesgin2:
+	cmp	A,4		jne p_mesgin3	# disconnect code?
+
+	or	SCBARRAY+0,0x4			# set "disconnected" bit
+	jmp	p_mesgin_done
+
+#  Save data pointers message?  Copy working values into the SCB,
+#  usually in preparation for a disconnect.
+#
+p_mesgin3:
+	cmp	A,2		jne p_mesgin4	# save data pointers code?
+
+	call	sg_ram2scb
+	jmp	p_mesgin_done
+
+#  Restore pointers message?  Data pointers are recopied from the
+#  SCB anyway at the start of any DMA operation, so the only thing
+#  to copy is the scatter-gather values.
+#
+p_mesgin4:
+	cmp	A,3		jne p_mesgin5	# restore pointers code?
+
+	call	sg_scb2ram
+	jmp	p_mesgin_done
+
+#  Identify message?  For a reconnecting target, this tells us the lun
+#  that the reconnection is for - find the correct SCB and switch to it,
+#  clearing the "disconnected" bit so we don't "find" it by accident later.
+#
+p_mesgin5:
+	test	A,0x80		jz p_mesgin6	# identify message?
+
+	test	A,0x78		jnz p_mesginN	# !DiscPriv|!LUNTAR|!Reserved
+
+	mov	A		call findSCB	# switch to correct SCB
+
+#  If a active message is present after calling findSCB, then either it
+#  or the driver is trying to abort the command.  Either way, something
+#  untoward has happened and we should just leave it alone.
+#
+	test	MSG_FLAGS,0x80	jnz p_mesgin_done
+
+	xor	SCBARRAY+0,0x4			# clear disconnect bit in SCB
+	mvi	RESELECT,0xc0			# make note of IDENTIFY
+
+	call	sg_scb2ram			# implied restore pointers
+						#   required on reselect
+	jmp	p_mesgin_done
+
+#  Message reject?  If we have an outstanding SDTR negotiation, assume
+#  that it's a response from the target selecting asynchronous transfer,
+#  otherwise just ignore it since we have no clue what it pertains to.
+#
+#  XXX - I don't have a device that responds this way.  Does this code
+#	 actually work?
+#
+p_mesgin6:
+	cmp	A,7		jne p_mesgin7	# message reject code?
+
+	and	FUNCTION1,0x70,SCSIID		# outstanding SDTR message?
+	mov	A,FUNCTION1
+	test	NEEDSDTR,A	jz p_mesgin_done  # no - ignore rejection
+
+	call	ndx_sdtr			# note use of asynch xfer
+	mov	DINDEX,SINDEX
+	clr	DINDIR
+
+	not	A				# turn off "active sdtr" flag
+	and	NEEDSDTR,A
+
+	clr	SCSIRATE			# select asynch xfer
+	jmp	p_mesgin_done
+
+#  [ ADD MORE MESSAGE HANDLING HERE ]
+#
+p_mesgin7:
+
+#  We have no idea what this message in is, and there's no way
+#  to pass it up to the kernel, so we issue a message reject and
+#  hope for the best.  Since we're now using manual PIO mode to
+#  read in the message, there should no longer be a race condition
+#  present when we assert ATN.  In any case, rejection should be a
+#  rare occurrence - signal the driver when it happens.
+#
+p_mesginN:
+	or	SINDEX,0x10,SIGSTATE		# turn on ATNO
+	call	scsisig
+	mvi	INTSTAT,SIGNAL_1		# let driver know
+
+	mvi	0x7		call mk_mesg	# MESSAGE REJECT message
+
+p_mesgin_done:
+	call	inb_last			# ack & turn auto PIO back on
+	jmp	ITloop
+
+#  Bus free phase.  It might be useful to interrupt the device
+#  driver if we aren't expecting this.  For now, make sure that
+#  ATN isn't being asserted and look for a new command.
+#
+p_busfree:
+	mvi	CLRSINT1,0x40			# CLRATNO
+	clr	SIGSTATE
+	jmp	start
+
+#  Bcopy: number of bytes to transfer should be in A, DINDEX should
+#  contain the destination address, and SINDEX should contain the
+#  source address.  All input parameters are trashed on return.
+#
+bcopy:
+	mov	DINDIR,SINDIR
+	dec	A
+	cmp	ALLZEROS,A	jne bcopy
+	ret
+
+#  Locking the driver out, build a one-byte message passed in SINDEX
+#  if there is no active message already.  SINDEX is returned intact.
+#
+mk_mesg:
+	mvi	SEQCTL,0x40			# PAUSEDIS
+	test	MSG_FLAGS,0x80	jnz mk_mesg1	# active message?
+
+	mvi	MSG_FLAGS,0x80			# if not, there is now
+	mvi	MSG_LEN,1			# length = 1
+	mov	MSG_START+0,SINDEX		# 1-byte message
+
+mk_mesg1:
+	clr	SEQCTL				# !PAUSEDIS
+	ret
+
+#  Input byte in Automatic PIO mode.  The address to store the byte
+#  in should be in SINDEX.  DINDEX will be used by this routine.
+#
+inb:
+	test	SSTAT0,0x2	jz inb		# SPIORDY
+	mov	DINDEX,SINDEX
+	call	one_stcnt			# xfer one byte
+	mov	DINDIR,SCSIDATL
+inb1:
+	test	SSTAT0,0x4	jz inb1		# SDONE - wait to "finish"
+	ret
+
+#  Carefully read data in Automatic PIO mode.  I first tried this using
+#  Manual PIO mode, but it gave me continual underrun errors, probably
+#  indicating that I did something wrong, but I feel more secure leaving
+#  Automatic PIO on all the time.
+#
+#  According to Adaptec's documentation, an ACK is not sent on input from
+#  the target until SCSIDATL is read from.  So we wait until SCSIDATL is
+#  latched (the usual way), then read the data byte directly off the bus
+#  using SCSIBUSL.  When we have pulled the ATN line, or we just want to
+#  acknowledge the byte, then we do a dummy read from SCISDATL.  The SCSI
+#  spec guarantees that the target will hold the data byte on the bus until
+#  we send our ACK.
+#
+#  The assumption here is that these are called in a particular sequence,
+#  and that REQ is already set when inb_first is called.  inb_{first,next}
+#  use the same calling convention as inb.
+#
+inb_first:
+	mov	DINDEX,SINDEX
+	mov	DINDIR,SCSIBUSL	ret		# read byte directly from bus
+
+inb_next:
+	mov	DINDEX,SINDEX			# save SINDEX
+
+	call	one_stcnt			# xfer one byte
+	mov	NONE,SCSIDATL			# dummy read from latch to ACK
+inb_next1:
+	test	SSTAT0,0x4	jz inb_next1	# SDONE
+inb_next2:
+	test	SSTAT0,0x2	jz inb_next2	# SPIORDY - wait for next byte
+	mov	DINDIR,SCSIBUSL	ret		# read byte directly from bus
+
+inb_last:
+	call	one_stcnt			# ACK with dummy read
+	mov	NONE,SCSIDATL
+inb_last1:
+	test	SSTAT0,0x4	jz inb_last1	# wait for completion
+	ret
+
+#  Output byte in Automatic PIO mode.  The byte to output should be
+#  in SINDEX.  If DROPATN's high bit is set, then ATN will be dropped
+#  before the byte is output.
+#
+outb:
+	test	SSTAT0,0x2	jz outb		# SPIORDY
+	call	one_stcnt			# xfer one byte
+
+	test	DROPATN,0x80	jz outb1
+	mvi	CLRSINT1,0x40			# CLRATNO
+	clr	DROPATN
+outb1:
+	mov	SCSIDATL,SINDEX
+outb2:
+	test	SSTAT0,0x4	jz outb2	# SDONE
+	ret
+
+#  Write the value "1" into the STCNT registers, for Automatic PIO
+#  transfers.
+#
+one_stcnt:
+	clr	STCNT+2
+	clr	STCNT+1
+	mvi	STCNT+0,1	ret
+
+#  DMA data transfer.  HADDR and HCNT must be loaded first, and
+#  SINDEX should contain the value to load DFCNTRL with - 0x3d for
+#  host->scsi, or 0x39 for scsi->host.  The SCSI channel is cleared
+#  during initialization.
+#
+dma:
+	mov	DFCNTRL,SINDEX
+dma1:
+dma2:
+	test	SSTAT0,0x1	jnz dma3	# DMADONE
+	test	SSTAT1,0x10	jz dma1		# PHASEMIS, ie. underrun
+
+#  We will be "done" DMAing when the transfer count goes to zero, or
+#  the target changes the phase (in light of this, it makes sense that
+#  the DMA circuitry doesn't ACK when PHASEMIS is active).  If we are
+#  doing a SCSI->Host transfer, flush the data FIFO.
+#
+dma3:
+	test	SINDEX,0x4	jnz dma5	# DIRECTION
+	and	SINDEX,0xfe			# mask out FIFORESET
+	or	DFCNTRL,0x2,SINDEX		# FIFOFLUSH
+dma4:
+	test	DFCNTRL,0x2	jnz dma4	# FIFOFLUSHACK
+
+#  Now shut the DMA enables off, and copy STCNT (ie. the underrun
+#  amount, if any) to the SCB registers; SG_COUNT will get copied to
+#  the SCB's residual S/G count field after sg_advance is called.  Make
+#  sure that the DMA enables are actually off first lest we get an ILLSADDR.
+#
+dma5:
+	clr	DFCNTRL				# disable DMA
+dma6:
+	test	DFCNTRL,0x38	jnz dma6	# SCSIENACK|SDMAENACK|HDMAENACK
+
+	mvi	A,3
+	mvi	DINDEX,SCBARRAY+15
+	mvi	STCNT		call bcopy
+
+	ret
+
+#  Common SCSI initialization for selection and reselection.  Expects
+#  the target SCSI ID to be in the upper four bits of SINDEX, and A's
+#  contents are stomped on return.
+#
+initialize:
+	clr	SBLKCTL				# channel A, !wide
+	and	SCSIID,0xf0,SINDEX		# target ID
+	and	A,0x7,SCSICONF			# SCSI_ID_A[210]
+	or	SCSIID,A
+
+#  Esundry initialization.
+#
+	clr	DROPATN
+	clr	SIGSTATE
+
+#  Turn on Automatic PIO mode now, before we expect to see an REQ
+#  from the target.  It shouldn't hurt anything to leave it on.  Set
+#  CLRCHN here before the target has entered a data transfer mode -
+#  with synchronous SCSI, if you do it later, you blow away some
+#  data in the SCSI FIFO that the target has already sent to you.
+#
+	mvi	SXFRCTL0,0xa			# SPIOEN|CLRCHN
+
+#  Set SCSI bus parity checking and the selection timeout value,
+#  and enable the hardware selection timer.  Set the SELTO interrupt
+#  to signal the driver.
+#
+	and	A,0x38,SCSICONF			# PARITY_ENB_A|SEL_TIM_A[10]
+	or	SXFRCTL1,0x4,A			# ENSTIMER
+	mvi	SIMODE1,0x84			# ENSELTIMO|ENSCSIPERR
+	
+#  Initialize scatter-gather pointers by setting up the working copy
+#  in scratch RAM.
+#
+	call	sg_scb2ram
+
+#  Initialize SCSIRATE with the appropriate value for this target.
+#
+	call	ndx_sdtr
+	mov	SCSIRATE,SINDIR
+	ret
+
+#  Assert that if we've been reselected, then we've seen an IDENTIFY
+#  message.
+#
+assert:
+	test	RESELECT,0x80	jz assert1	# reselected?
+	test	RESELECT,0x40	jnz assert1	# seen IDENTIFY?
+
+	mvi	INTSTAT,SIGNAL_2		# no - cause a kernel panic
+
+assert1:
+	ret
+
+#  Find out if disconnection is ok from the information the BIOS has left
+#  us.  The target ID should be in the upper four bits of SINDEX; A will
+#  contain either 0x40 (disconnection ok) or 0x00 (diconnection not ok)
+#  on exit.
+#
+#  This is the only place the target ID is limited to three bits, so we
+#  can use the FUNCTION1 register.
+#
+disconnect:
+	and	FUNCTION1,0x70,SINDEX		# strip off extra just in case
+	mov	A,FUNCTION1
+	test	DISC_DSB_A,A	jz disconnect1	# bit nonzero if DISabled
+
+	clr	A		ret
+disconnect1:
+	mvi	A,0x40		ret
+
+#  Locate the SCB matching the target ID in SELID and the lun in the lower
+#  three bits of SINDEX, and switch the SCB to it.  Have the kernel print
+#  a warning message if it can't be found, and generate an ABORT message
+#  to the target.  We keep the value of the t/c/l that we are trying to 
+#  in DINDEX so it is not overwritten during our check to see if we are
+#  at the last SCB.
+#
+findSCB:
+	and	A,0x7,SINDEX		# lun in lower three bits
+	or	DINDEX,A,SELID		# can I do this?
+	and	DINDEX,0xf7		# only channel A implemented
+
+	clr	SINDEX
+
+findSCB1:
+	mov	SCBPTR,SINDEX			# switch to new SCB
+	mov	A,DINDEX
+	cmp	SCBARRAY+1,A	jne findSCB2	# target ID/channel/lun match?
+	test	SCBARRAY+0,0x4	jz findSCB2	# should be disconnected
+
+	ret
+
+findSCB2:
+	inc	SINDEX
+	mov	A,SCBCOUNT
+	cmp	SINDEX,A	jne findSCB1
+
+	mvi	INTSTAT,SIGNAL_3		# not found - signal kernel
+	mvi	0x6		call mk_mesg	# ABORT message
+
+	or	SINDEX,0x10,SIGSTATE		# assert ATNO
+	call	scsisig
+	ret
+
+#  Make a working copy of the scatter-gather parameters in the SCB.
+#
+sg_scb2ram:
+	mov	SG_COUNT,SCBARRAY+2
+
+	mvi	A,4
+	mvi	DINDEX,SG_NEXT
+	mvi	SCBARRAY+3	call bcopy
+
+	mvi	SG_NOLOAD,0x80
+	test	SCBARRAY+0,0x10	jnz sg_scb2ram1	# don't reload s/g?
+	clr	SG_NOLOAD
+
+sg_scb2ram1:
+	ret
+
+#  Copying RAM values back to SCB, for Save Data Pointers message.
+#
+sg_ram2scb:
+	mov	SCBARRAY+2,SG_COUNT
+
+	mvi	A,4
+	mvi	DINDEX,SCBARRAY+3
+	mvi	SG_NEXT		call bcopy
+
+	and	SCBARRAY+0,0xef,SCBARRAY+0
+	test	SG_NOLOAD,0x80	jz sg_ram2scb1	# reload s/g?
+	or	SCBARRAY+0,0x10
+
+sg_ram2scb1:
+	ret
+
+#  Load a struct scatter if needed and set up the data address and
+#  length.  If the working value of the SG count is nonzero, then
+#  we need to load a new set of values.
+#
+#  This, like the above DMA, assumes a little-endian host data storage.
+#
+sg_load:
+	test	SG_COUNT,0xff	jz sg_load3	# SG being used?
+	test	SG_NOLOAD,0x80	jnz sg_load3	# don't reload s/g?
+
+	clr	HCNT+2
+	clr	HCNT+1
+	mvi	HCNT+0,SG_SIZEOF
+
+	mvi	A,4
+	mvi	DINDEX,HADDR
+	mvi	SG_NEXT		call bcopy
+
+	mvi	DFCNTRL,0xd			# HDMAEN|DIRECTION|FIFORESET
+
+#  Wait for DMA from host memory to data FIFO to complete, then disable
+#  DMA and wait for it to acknowledge that it's off.
+#
+sg_load1:
+	test	DFSTATUS,0x8	jz sg_load1	# HDONE
+
+	clr	DFCNTRL				# disable DMA
+sg_load2:
+	test	DFCNTRL,0x8	jnz sg_load2	# HDMAENACK
+
+#  Copy data from FIFO into SCB data pointer and data count.  This assumes
+#  that the struct scatterlist has this structure (this and sizeof(struct
+#  scatterlist) == 12 are asserted in aic7xxx.c):
+#
+#	struct scatterlist {
+#		char *address;		/* four bytes, little-endian order */
+#		...			/* four bytes, ignored */
+#		unsigned short length;	/* two bytes, little-endian order */
+#	}
+#
+
+# Not in FreeBSD.  the scatter list is only 8 bytes.
+# 
+# struct ahc_dma_seg {
+#       physaddr addr;                  /* four bytes, little-endian order */
+#       long    len;                    /* four bytes, little endian order */   
+# };
+#
+
+	mov	SCBARRAY+19,DFDAT		# new data address
+	mov	SCBARRAY+20,DFDAT
+	mov	SCBARRAY+21,DFDAT
+	mov	SCBARRAY+22,DFDAT
+
+	mov	SCBARRAY+23,DFDAT
+	mov	SCBARRAY+24,DFDAT
+	mov	SCBARRAY+25,DFDAT
+	mov	NONE,DFDAT			#Only support 24 bit length.
+
+sg_load3:
+	ret
+
+#  Advance the scatter-gather pointers only IF NEEDED.  If SG is enabled,
+#  and the SCSI transfer count is zero (note that this should be called
+#  right after a DMA finishes), then move the working copies of the SG
+#  pointer/length along.  If the SCSI transfer count is not zero, then
+#  presumably the target is disconnecting - do not reload the SG values
+#  next time.
+#
+sg_advance:
+	test	SG_COUNT,0xff	jz sg_advance2	# s/g enabled?
+
+	test	STCNT+0,0xff	jnz sg_advance1	# SCSI transfer count nonzero?
+	test	STCNT+1,0xff	jnz sg_advance1
+	test	STCNT+2,0xff	jnz sg_advance1
+
+	clr	SG_NOLOAD			# reload s/g next time
+	dec	SG_COUNT			# one less segment to go
+
+	clr	A				# add sizeof(struct scatter)
+	add	SG_NEXT+0,SG_SIZEOF,SG_NEXT+0
+	adc	SG_NEXT+1,A,SG_NEXT+1
+	adc	SG_NEXT+2,A,SG_NEXT+2
+	adc	SG_NEXT+3,A,SG_NEXT+3
+
+	ret
+
+sg_advance1:
+	mvi	SG_NOLOAD,0x80			# don't reload s/g next time
+sg_advance2:
+	ret
+
+#  Add the array base SYNCNEG to the target offset (the target address
+#  is in SCSIID), and return the result in SINDEX.  The accumulator
+#  contains the 3->8 decoding of the target ID on return.
+#
+ndx_sdtr:
+	shr	A,SCSIID,4
+	and	A,0x7
+	add	SINDEX,SYNCNEG,A
+
+	and	FUNCTION1,0x70,SCSIID		# 3-bit target address decode
+	mov	A,FUNCTION1	ret
+
+#  If we need to negotiate transfer parameters, build the SDTR message
+#  starting at the address passed in SINDEX.  DINDEX is modified on return.
+#
+mk_sdtr:
+	mov	DINDEX,SINDEX			# save SINDEX
+
+	call	ndx_sdtr
+	test	NEEDSDTR,A	jnz mk_sdtr1	# do we need negotiation?
+	ret
+
+mk_sdtr1:
+	mvi	DINDIR,1			# extended message
+	mvi	DINDIR,3			# extended message length = 3
+	mvi	DINDIR,1			# SDTR code
+	mvi	DINDIR,25			# REQ/ACK transfer period
+	mvi	DINDIR,15			# REQ/ACK offset
+
+	add	MSG_LEN,-MSG_START+0,DINDEX	# update message length
+	ret
+
+#  Set SCSI bus control signal state.  This also saves the last-written
+#  value into a location where the higher-level driver can read it - if
+#  it has to send an ABORT or RESET message, then it needs to know this
+#  so it can assert ATN without upsetting SCSISIGO.  The new value is
+#  expected in SINDEX.  Change the actual state last to avoid contention
+#  from the driver.
+#
+scsisig:
+	mov	SIGSTATE,SINDEX
+	mov	SCSISIGO,SINDEX	ret
+
diff --git a/sys/gnu/misc/aic7xxx/COPYING b/sys/gnu/misc/aic7xxx/COPYING
new file mode 100644
index 0000000000000..a43ea2126fb6b
--- /dev/null
+++ b/sys/gnu/misc/aic7xxx/COPYING
@@ -0,0 +1,339 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                          675 Mass Ave, Cambridge, MA 02139, USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
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+Foundation's software and to any other program whose authors commit to
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+
+  When we speak of free software, we are referring to freedom, not
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+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
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+
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+
+  Also, for each author's protection and ours, we want to make certain
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+  The precise terms and conditions for copying, distribution and
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+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	Appendix: How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) 19yy  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) 19yy name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/sys/gnu/misc/aic7xxx/COPYRIGHT b/sys/gnu/misc/aic7xxx/COPYRIGHT
new file mode 100644
index 0000000000000..905285da67595
--- /dev/null
+++ b/sys/gnu/misc/aic7xxx/COPYRIGHT
@@ -0,0 +1,16 @@
+Adaptec 274x device driver for Linux.
+Copyright (c) 1994 The University of Calgary Department of Computer Science.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
diff --git a/sys/gnu/misc/aic7xxx/README b/sys/gnu/misc/aic7xxx/README
new file mode 100644
index 0000000000000..1e4e5a011a697
--- /dev/null
+++ b/sys/gnu/misc/aic7xxx/README
@@ -0,0 +1,94 @@
+@(#)README 1.16 94/11/09 jda
+
+AHA274x/284x DRIVER
+
+***  THIS SHOULD BE CONSIDERED BETA SOFTWARE  ***
+
+BACKGROUND & LIMITATIONS
+
+For various reasons, we ended up with one of these cards under the
+impression that support was soon forthcoming.  In mid-May, I asked
+Scott Ferris (the official person who's supposed to be writing this
+driver) what documentation he used, _finally_ got it from Adaptec,
+and started writing this driver.  It is now at what I would consider
+a stable state - it runs our news server and is battered by SCSI
+requests 24 hours a day without dying.  There are a few devices it
+reportedly doesn't like working with - those are being sorted out.  Due
+to some unexpected equipment loans, I am able to support this at least
+for the time being.
+
+YOU MUST HAVE THE BIOS ENABLED OR THIS WILL NOT WORK.  The BIOS extracts
+some configuration information that I cannot get to portably yet, as
+well as provides some self-tests which this driver does not attempt to
+duplicate.
+
+Scott's driver development is stalled for now, and after discussions
+with him, this is now officially out of "pre-alpha" status and into
+beta until the remaining device problems can be resolved.  The latest
+patches can be obtained via anonymous ftp from ftp.cpsc.ucalgary.ca in
+/pub/systems/linux/aha274x.
+
+It supports both EISA 274x and VL-bus 284x, either single or twin-bus cards
+(but not the second SCSI bus of twin cards - see aha274x.c), and supports
+disconnection, synchronous SCSI, and scatter-gather.  Unlike previous
+versions, abort() and reset() are now implemented, and both hosts.c and
+aha274x.c should give a clean compile.  Code is now present to detect parity
+errors, but has not been tested.
+
+I wrote this using a 1.0.9 kernel.  Unfortunately, I'm getting tired of
+#ifdef'ing everything to handle two or three different evolutionary steps
+in the SCSI kernel code, so I've upgraded my system to 1.1.49, and will
+only leave in code to support versions from about 1.1.45 onward.
+
+Thanks to patches supplied by Mark Olson <molson@tricord.com>, this driver
+will now work with the 284x series (the VL-bus version of this card).  The
+294x (PCI-bus) support is based on patches sent to me by Mark Olson and
+Alan Hourihane <alanh@fairlite.demon.co.uk>.
+
+Under protest, this driver is subject to the GPL - see the file
+COPYING for details.
+
+Thanks to the following people for bug fixes/code improvements (also
+thanks to the people who have sent me feedback):
+
+	"David F. Carlson" <dave@ee.rochester.edu>
+	Jimen Ching <jiching@wiliki.eng.hawaii.edu>
+	mday@artisoft.com (Matt Day)
+	"Dean W. Gehnert" <deang@ims.com>
+	Darcy Grant <darcy@cpsc.ucalgary.ca>
+	Alan Hourihane <alanh@fairlite.demon.co.uk>
+	isely@fncrd8.fnal.gov (Mike Isely)
+	Mike Jerger <jerger@ux1.cso.uiuc.edu>
+	tm@netcom.com (Toshiyasu Morita)
+	neal@interact.org (Neal Norwitz)
+	Mark Olson <molson@tricord.com>
+	map@europa.ecn.uoknor.edu (Michael A. Parker)
+	Thomas Scheunemann <thomas@dagobert.uni-duisburg.de>
+
+Special thanks to Drew Eckhardt <drew@kinglear.cs.Colorado.EDU> for
+fielding my questions about synchronous negotiation.  Steffen Moeller
+<smoe0024@rz.uni-hildesheim.de> sent me installation instructions which
+were previously included in this README.
+
+David Pirie <pirie@cpsc.ucalgary.ca> was nice enough to loan me his
+2842 card for a week so I could track down one bug, as well as his
+CD-ROM drive later, and also thanks to Doug Fortune at Riley's Data Share
+in Calgary, who arranged a long-term loan of a 2842 board for further work.
+
+Many thanks to the fearless prerelease testers!  Dean Gehnert has been
+building Slackware boot disks for the driver, which are available from
+ftp.cpsc.ucalgary.ca in /pub/systems/linux/aha274x/slackware_boot.
+
+Carl Riches <cgr@poplar1.cfr.washington.edu> has set up a mailing list
+for aic7xxx driver development.  To subscribe, send a message to
+aic7770-list@poplar1.cfr.washington.edu with a message body of:
+
+    subscribe AIC7770-LIST <your name here, without the angle brackets>
+
+Please direct questions and discussions to that list instead of me.  When
+sending bug reports, please include a description of your hardware, the
+release numbers displayed by the driver at boot time, and as accurate a
+facsimilie of any error message you're mailing about.
+
+John Aycock
+aycock@cpsc.ucalgary.ca
diff --git a/sys/gnu/misc/aic7xxx/README-FIRST b/sys/gnu/misc/aic7xxx/README-FIRST
new file mode 100644
index 0000000000000..056dbc82cd614
--- /dev/null
+++ b/sys/gnu/misc/aic7xxx/README-FIRST
@@ -0,0 +1,19 @@
+This is VERY MUCH ALPHA SOFTWARE.  You MUST know what you're doing to
+use this, or else!!!
+
+Ok, everything's been renamed to reference an "aic7xxx" driver instead
+of "aha274x", and a merger of the two PCI patches I had has been put in,
+along with re-doing the detection and configuration routines.  To summarize
+the status: it compiles cleanly.  I don't expect it to work off the bat,
+but it's for the 294x development people to synchronize their code
+together.
+
+The file scsi-diffs-1.1.59 is NOT a proper patch file, but some diffs
+to kernel files concatenated together.  I've sent these off to Drew,
+but if you're testing this you'll have to apply them - it allows a
+per-driver-instance can_queue variable, which for the aic7xxx driver
+is the number of SCBs the card supports.
+
+Good luck!  I await your comments.. Mark, Alan - let me know where I
+broke it, please ;-)
+:ja
diff --git a/sys/gnu/misc/aic7xxx/aic7xxx.1 b/sys/gnu/misc/aic7xxx/aic7xxx.1
new file mode 100644
index 0000000000000..2009f8c7ad6ec
--- /dev/null
+++ b/sys/gnu/misc/aic7xxx/aic7xxx.1
@@ -0,0 +1,54 @@
+.\" Copyright (c) 1994
+.\"	Justin T. Gibbs.  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 Justin T. Gibbs.
+.\" 4. The name of Justin T. Gibbs may not be used to endorse or promote 
+.\"    products derived from this software without specific prior written 
+.\"    permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY JUSTIN T. GIBBS ``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.
+.\"
+.\"     @(#)aic7770.1	11/15/94
+.\"
+.Dd November 11, 1994
+.Dt AIC7770 1
+.Os BSD 4
+.Sh NAME
+.Nm aic7770
+.Nd aic7770 SCSI controller assembler
+.Sh SYNOPSIS
+.Nm aic7770
+.Op Fl o destination
+.Ar source-file
+.Sh DESCRIPTION
+.Ar Source-file
+is a file containing Aic7770 compatible assembly code.  The output of the
+assembler defaults to 
+.Ar a.out
+but can be optionally redirected to
+.Ar destination.
+.Pp
+.Sh AUTHOR
+This aic7770 compiler was written by John Aycock (aycock@cpsc.ucalgary.ca) and
+is subject to the GNU Public License.
+
diff --git a/sys/gnu/misc/aic7xxx/aic7xxx.c b/sys/gnu/misc/aic7xxx/aic7xxx.c
new file mode 100644
index 0000000000000..417a352762d31
--- /dev/null
+++ b/sys/gnu/misc/aic7xxx/aic7xxx.c
@@ -0,0 +1,584 @@
+/*
+ * Adaptec 274x device driver for Linux.
+ * Copyright (c) 1994 The University of Calgary Department of Computer Science.
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  Comments are started by `#' and continue to the end of the line; lines
+ *  may be of the form:
+ *
+ *	<label>*
+ *	<label>*  <undef-sym> = <value>
+ *	<label>*  <opcode> <operand>*
+ *
+ *  A <label> is an <undef-sym> ending in a colon.  Spaces, tabs, and commas
+ *  are token separators.
+ */
+
+/* #define _POSIX_SOURCE	1 */
+#define _POSIX_C_SOURCE	2
+
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define MEMORY		512		/* 2^9 29-bit words */
+#define MAXLINE		1024
+#define MAXTOKEN	32
+#define ADOTOUT		"a.out"
+#define NOVALUE		-1
+
+/*
+ *  AIC-7770 register definitions
+ */
+#define R_SINDEX	0x65
+#define R_ALLONES	0x69
+#define R_ALLZEROS	0x6a
+#define R_NONE		0x6a
+
+static
+char sccsid[] =
+    "@(#)aic7770.c 1.10 94/07/22 jda";
+
+int debug;
+int lineno, LC;
+char *filename;
+FILE *ifp, *ofp;
+unsigned char M[MEMORY][4];
+
+void error(char *s)
+{
+	fprintf(stderr, "%s: %s at line %d\n", filename, s, lineno);
+	exit(EXIT_FAILURE);
+}
+
+void *Malloc(size_t size)
+{
+	void *p = malloc(size);
+	if (!p)
+		error("out of memory");
+	return(p);
+}
+
+void *Realloc(void *ptr, size_t size)
+{
+	void *p = realloc(ptr, size);
+	if (!p)
+		error("out of memory");
+	return(p);
+}
+
+char *Strdup(char *s)
+{
+	char *p = (char *)Malloc(strlen(s) + 1);
+	strcpy(p, s);
+	return(p);
+}
+
+typedef struct sym_t {
+	struct sym_t *next;		/* MUST BE FIRST */
+	char *name;
+	int value;
+	int npatch, *patch;
+} sym_t;
+
+sym_t *head;
+
+void define(char *name, int value)
+{
+	sym_t *p, *q;
+
+	for (p = head, q = (sym_t *)&head; p; p = p->next) {
+		if (!strcmp(p->name, name))
+			error("redefined symbol");
+		q = p;
+	}
+
+	p = q->next = (sym_t *)Malloc(sizeof(sym_t));
+	p->next = NULL;
+	p->name = Strdup(name);
+	p->value = value;
+	p->npatch = 0;
+	p->patch = NULL;
+
+	if (debug) {
+		fprintf(stderr, "\"%s\" ", p->name);
+		if (p->value != NOVALUE)
+			fprintf(stderr, "defined as 0x%x\n", p->value);
+		else
+			fprintf(stderr, "undefined\n");
+	}
+}
+
+sym_t *lookup(char *name)
+{
+	sym_t *p;
+
+	for (p = head; p; p = p->next)
+		if (!strcmp(p->name, name))
+			return(p);
+	return(NULL);
+}
+
+void patch(sym_t *p, int location)
+{
+	p->npatch += 1;
+	p->patch = (int *)Realloc(p->patch, p->npatch * sizeof(int *));
+
+	p->patch[p->npatch - 1] = location;
+}
+
+void backpatch(void)
+{
+	int i;
+	sym_t *p;
+
+	for (p = head; p; p = p->next) {
+
+		if (p->value == NOVALUE) {
+			fprintf(stderr,
+				"%s: undefined symbol \"%s\"\n",
+				filename, p->name);
+			exit(EXIT_FAILURE);
+		}
+
+		if (p->npatch) {
+			if (debug)
+				fprintf(stderr,
+					"\"%s\" (0x%x) patched at",
+					p->name, p->value);
+
+			for (i = 0; i < p->npatch; i++) {
+				M[p->patch[i]][0] &= ~1;
+				M[p->patch[i]][0] |= ((p->value >> 8) & 1);
+				M[p->patch[i]][1] = p->value & 0xff;
+
+				if (debug)
+					fprintf(stderr, " 0x%x", p->patch[i]);
+			}
+
+			if (debug)
+				fputc('\n', stderr);
+		}
+	}
+}
+
+/*
+ *  Output words in byte-reversed order (least significant first)
+ *  since the sequencer RAM is loaded that way.
+ */
+void output(FILE *fp)
+{
+	int i;
+
+	for (i = 0; i < LC; i++)
+		fprintf(fp, "\t0x%02x, 0x%02x, 0x%02x, 0x%02x,\n",
+			M[i][3],
+			M[i][2],
+			M[i][1],
+			M[i][0]);
+}
+
+char **getl(int *n)
+{
+	int i;
+	char *p;
+	static char buf[MAXLINE];
+	static char *a[MAXTOKEN];
+
+	i = 0;
+
+	while (fgets(buf, sizeof(buf), ifp)) {
+
+		lineno += 1;
+
+		if (buf[strlen(buf)-1] != '\n')
+			error("line too long");
+
+		p = strchr(buf, '#');
+		if (p)
+			*p = '\0';
+
+		for (p = strtok(buf, ", \t\n"); p; p = strtok(NULL, ", \t\n"))
+			if (i < MAXTOKEN-1)
+				a[i++] = p;
+			else
+				error("too many tokens");
+		if (i) {
+			*n = i;
+			return(a);
+		}
+	}
+	return(NULL);
+}
+
+#define A	0x8000		/* `A'ccumulator ok */
+#define I	0x4000		/* use as immediate value */
+#define SL	0x2000		/* shift left */
+#define SR	0x1000		/* shift right */
+#define RL	0x0800		/* rotate left */
+#define RR	0x0400		/* rotate right */
+#define LO	0x8000		/* lookup: ori-{jmp,jc,jnc,call} */
+#define LA	0x4000		/* lookup: and-{jz,jnz} */
+#define LX	0x2000		/* lookup: xor-{je,jne} */
+#define NA	-1		/* not applicable */
+
+struct {
+	char *name;
+	int n;			/* number of operands, including opcode */
+	unsigned int op;	/* immediate or L?|pos_from_0 */
+	unsigned int dest;	/* NA, pos_from_0, or I|immediate */
+	unsigned int src;	/* NA, pos_from_0, or I|immediate */
+	unsigned int imm;	/* pos_from_0, A|pos_from_0, or I|immediate */
+	unsigned int addr;	/* NA or pos_from_0 */
+	int fmt;		/* instruction format - 1, 2, or 3 */
+} instr[] = {
+/*
+ *		N  OP	 DEST		SRC		IMM	ADDR FMT
+ */
+	"mov",	3, 1,	 1,		2,		I|0xff,	NA,  1,
+	"mov",	4, LO|2, NA,		1,		I|0,	3,   3,
+	"mvi",	3, 0,	 1,		I|R_ALLZEROS,	A|2,	NA,  1,
+	"mvi",	4, LO|2, NA,		I|R_ALLZEROS,	1,	3,   3,
+	"not",	2, 2,	 1,		1,		I|0xff,	NA,  1,
+	"not",	3, 2,	 1,		2,		I|0xff,	NA,  1,
+	"and",	3, 1,	 1,		1,		A|2,	NA,  1,
+	"and",  4, 1,	 1,		3,		A|2,	NA,  1,
+	"or",	3, 0,	 1,		1,		A|2,	NA,  1,
+	"or",	4, 0,	 1,		3,		A|2,	NA,  1,
+	"or",	5, LO|3, NA,		1,		2,	4,   3,
+	"xor",	3, 2,	 1,		1,		A|2,	NA,  1,
+	"xor",	4, 2,	 1,		3,		A|2,	NA,  1,
+	"nop",	1, 1,	 I|R_NONE,	I|R_ALLZEROS,	I|0xff,	NA,  1,
+	"inc",	2, 3,	 1,		1,		I|1,	NA,  1,
+	"inc",	3, 3,	 1,		2,		I|1,	NA,  1,
+	"dec",	2, 3,	 1,		1,		I|0xff,	NA,  1,
+	"dec",	3, 3,	 1,		2,		I|0xff,	NA,  1,
+	"jmp",	2, LO|0, NA,		I|R_SINDEX,	I|0,	1,   3,
+	"jc",	2, LO|0, NA,		I|R_SINDEX,	I|0,	1,   3,
+	"jnc",	2, LO|0, NA,		I|R_SINDEX,	I|0,	1,   3,
+	"call",	2, LO|0, NA,		I|R_SINDEX,	I|0,	1,   3,
+	"test",	5, LA|3, NA,		1,		A|2,	4,   3,
+	"cmp",	5, LX|3, NA,		1,		A|2,	4,   3,
+	"ret",	1, 1,	 I|R_NONE,	I|R_ALLZEROS,	I|0xff,	NA,  1,
+	"clc",	1, 3,	 I|R_NONE,	I|R_ALLZEROS,	I|1,	NA,  1,
+	"clc",	4, 3,	 2,		I|R_ALLZEROS,	A|3,	NA,  1,
+	"stc",	1, 3,	 I|R_NONE,	I|R_ALLONES,	I|1,	NA,  1,
+	"stc",	2, 3,	 1,		I|R_ALLONES,	I|1,	NA,  1,
+	"add",	3, 3,	 1,		1,		A|2,	NA,  1,
+	"add",	4, 3,	 1,		3,		A|2,	NA,  1,
+	"adc",	3, 4,	 1,		1,		A|2,	NA,  1,
+	"adc",	4, 4,	 1,		3,		A|2,	NA,  1,
+	"shl",	3, 5,	 1,		1,		SL|2,	NA,  2,
+	"shl",	4, 5,	 1,		2,		SL|3,	NA,  2,
+	"shr",	3, 5,	 1,		1,		SR|2,	NA,  2,
+	"shr",	4, 5,	 1,		2,		SR|3,	NA,  2,
+	"rol",	3, 5,	 1,		1,		RL|2,	NA,  2,
+	"rol",	4, 5,	 1,		2,		RL|3,	NA,  2,
+	"ror",	3, 5,	 1,		1,		RR|2,	NA,  2,
+	"ror",	4, 5,	 1,		2,		RR|3,	NA,  2,
+	/*
+	 *  Extensions (note also that mvi allows A)
+	 */
+ 	"clr",	2, 1,	 1,		I|R_ALLZEROS,	I|0xff,	NA,  1,
+	0
+};
+
+int eval_operand(char **a, int spec)
+{
+	int i;
+	unsigned int want = spec & (LO|LA|LX);
+
+	static struct {
+		unsigned int what;
+		char *name;
+		int value;
+	} jmptab[] = {
+		LO,	"jmp",		8,
+		LO,	"jc",		9,
+		LO,	"jnc",		10,
+		LO,	"call",		11,
+		LA,	"jz",		15,
+		LA,	"jnz",		13,
+		LX,	"je",		14,
+		LX,	"jne",		12,
+	};
+
+	spec &= ~(LO|LA|LX);
+
+	for (i = 0; i < sizeof(jmptab)/sizeof(jmptab[0]); i++)
+		if (jmptab[i].what == want &&
+		    !strcmp(jmptab[i].name, a[spec]))
+		{
+			return(jmptab[i].value);
+		}
+
+	if (want)
+		error("invalid jump");
+
+	return(spec);		/* "case 0" - no flags set */
+}
+
+int eval_sdi(char **a, int spec)
+{
+	sym_t *p;
+	unsigned val;
+
+	if (spec == NA)
+		return(NA);
+
+	switch (spec & (A|I|SL|SR|RL|RR)) {
+	    case SL:
+	    case SR:
+	    case RL:
+	    case RR:
+		if (isdigit(*a[spec &~ (SL|SR|RL|RR)]))
+			val = strtol(a[spec &~ (SL|SR|RL|RR)], NULL, 0);
+		else {
+			p = lookup(a[spec &~ (SL|SR|RL|RR)]);
+			if (!p)
+				error("undefined symbol used");
+			val = p->value;
+		}
+
+		switch (spec & (SL|SR|RL|RR)) {		/* blech */
+		    case SL:
+			if (val > 7)
+				return(0xf0);
+			return(((val % 8) << 4) |
+			       (val % 8));
+		    case SR:
+			if (val > 7)
+				return(0xf0);
+			return(((val % 8) << 4) |
+			       (1 << 3) |
+			       ((8 - (val % 8)) % 8));
+		    case RL:
+			return(val % 8);
+		    case RR:
+			return((8 - (val % 8)) % 8);
+		}
+	    case I:
+		return(spec &~ I);
+	    case A:
+		/*
+		 *  An immediate field of zero selects
+		 *  the accumulator.  Vigorously object
+		 *  if zero is given otherwise - it's
+		 *  most likely an error.
+		 */
+		spec &= ~A;
+		if (!strcmp("A", a[spec]))
+			return(0);
+		if (isdigit(*a[spec]) &&
+		    strtol(a[spec], NULL, 0) == 0)
+		{
+			error("immediate value of zero selects accumulator");
+		}
+		/* falls through */
+	    case 0:
+		if (isdigit(*a[spec]))
+			return(strtol(a[spec], NULL, 0));
+		p = lookup(a[spec]);
+		if (p)
+			return(p->value);
+		error("undefined symbol used");
+	}
+
+	return(NA);		/* shut the compiler up */
+}
+
+int eval_addr(char **a, int spec)
+{
+	sym_t *p;
+
+	if (spec == NA)
+		return(NA);
+	if (isdigit(*a[spec]))
+		return(strtol(a[spec], NULL, 0));
+
+	p = lookup(a[spec]);
+
+	if (p) {
+		if (p->value != NOVALUE)
+			return(p->value);
+		patch(p, LC);
+	} else {
+		define(a[spec], NOVALUE);
+		p = lookup(a[spec]);
+		patch(p, LC);
+	}
+
+	return(NA);		/* will be patched in later */
+}
+
+int crack(char **a, int n)
+{
+	int i;
+	int I_imm, I_addr;
+	int I_op, I_dest, I_src, I_ret;
+
+	/*
+	 *  Check for "ret" at the end of the line; remove
+	 *  it unless it's "ret" alone - we still want to
+	 *  look it up in the table.
+	 */
+	I_ret = (strcmp(a[n-1], "ret") ? 0 : !0);
+	if (I_ret && n > 1)
+		n -= 1;
+
+	for (i = 0; instr[i].name; i++) {
+		/*
+		 *  Look for match in table given constraints,
+		 *  currently just the name and the number of
+		 *  operands.
+		 */
+		if (!strcmp(instr[i].name, *a) && instr[i].n == n)
+			break;
+	}
+	if (!instr[i].name)
+		error("unknown opcode or wrong number of operands");
+
+	I_op	= eval_operand(a, instr[i].op);
+	I_src	= eval_sdi(a, instr[i].src);
+	I_imm	= eval_sdi(a, instr[i].imm);
+	I_dest	= eval_sdi(a, instr[i].dest);
+	I_addr	= eval_addr(a, instr[i].addr);
+
+	switch (instr[i].fmt) {
+	    case 1:
+	    case 2:
+		M[LC][0] = (I_op << 1) | I_ret;
+		M[LC][1] = I_dest;
+		M[LC][2] = I_src;
+		M[LC][3] = I_imm;
+		break;
+	    case 3:
+		if (I_ret)
+			error("illegal use of \"ret\"");
+		M[LC][0] = (I_op << 1) | ((I_addr >> 8) & 1);
+		M[LC][1] = I_addr & 0xff;
+		M[LC][2] = I_src;
+		M[LC][3] = I_imm;
+		break;
+	}
+
+	return(1);		/* no two-byte instructions yet */
+}
+
+#undef SL
+#undef SR
+#undef RL
+#undef RR
+#undef LX
+#undef LA
+#undef LO
+#undef I
+#undef A
+
+void assemble(void)
+{
+	int n;
+	char **a;
+	sym_t *p;
+
+	while ((a = getl(&n))) {
+
+		while (a[0][strlen(*a)-1] == ':') {
+			a[0][strlen(*a)-1] = '\0';
+			p = lookup(*a);
+			if (p)
+				p->value = LC;
+			else
+				define(*a, LC);
+			a += 1;
+			n -= 1;
+		}
+
+		if (!n)			/* line was all labels */
+			continue;
+
+		if (n == 3 && !strcmp("VERSION", *a))
+			fprintf(ofp, "#define %s \"%s\"\n", a[1], a[2]);
+		else {
+			if (n == 3 && !strcmp("=", a[1]))
+				define(*a, strtol(a[2], NULL, 0));
+			else
+				LC += crack(a, n);
+		}
+	}
+
+	backpatch();
+	output(ofp);
+
+	if (debug)
+		output(stderr);
+}
+
+int main(int argc, char **argv)
+{
+	int c;
+
+	while ((c = getopt(argc, argv, "dho:")) != EOF) {
+		switch (c) {
+		    case 'd':
+			debug = !0;
+			break;
+		    case 'o':
+		        ofp = fopen(optarg, "w");
+			if (!ofp) {
+				perror(optarg);
+				exit(EXIT_FAILURE);
+			}
+			break;
+		    case 'h':
+			printf("usage: %s [-d] [-ooutput] input\n", *argv);
+			exit(EXIT_SUCCESS);
+		    case NULL:
+			/*
+			 *  An impossible option to shut the compiler
+			 *  up about sccsid[].
+			 */
+			exit((int)sccsid);
+		    default:
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	if (argc - optind != 1) {
+		fprintf(stderr, "%s: must have one input file\n", *argv);
+		exit(EXIT_FAILURE);
+	}
+	filename = argv[optind];
+
+	ifp = fopen(filename, "r");
+	if (!ifp) {
+		perror(filename);
+		exit(EXIT_FAILURE);
+	}
+
+	if (!ofp) {
+		ofp = fopen(ADOTOUT, "w");
+		if (!ofp) {
+			perror(ADOTOUT);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	assemble();
+	exit(EXIT_SUCCESS);
+}
diff --git a/sys/gnu/misc/aic7xxx/aic7xxx.seq b/sys/gnu/misc/aic7xxx/aic7xxx.seq
new file mode 100644
index 0000000000000..9b83b84f5472d
--- /dev/null
+++ b/sys/gnu/misc/aic7xxx/aic7xxx.seq
@@ -0,0 +1,1064 @@
+# @(#)aic7xxx.seq 1.30 94/11/09 jda
+#
+# Adaptec 274x device driver for Linux.
+# Copyright (c) 1994 The University of Calgary Department of Computer Science.
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+VERSION AIC7XXX_SEQ_VERSION 1.30
+
+MAXSCB-1	= 0xf
+
+SCSISEQ		= 0x00
+SXFRCTL0	= 0x01
+SXFRCTL1	= 0x02
+SCSISIGI	= 0x03
+SCSISIGO	= 0x03
+SCSIRATE	= 0x04
+SCSIID		= 0x05
+SCSIDATL	= 0x06
+STCNT		= 0x08
+STCNT+0		= 0x08
+STCNT+1		= 0x09
+STCNT+2		= 0x0a
+SSTAT0		= 0x0b
+CLRSINT1	= 0x0c
+SSTAT1		= 0x0c
+SIMODE1		= 0x11
+SCSIBUSL	= 0x12
+SHADDR		= 0x14
+SELID		= 0x19
+SBLKCTL		= 0x1f
+SEQCTL		= 0x60
+A		= 0x64				# == ACCUM
+SINDEX		= 0x65
+DINDEX		= 0x66
+ALLZEROS	= 0x6a
+NONE		= 0x6a
+SINDIR		= 0x6c
+DINDIR		= 0x6d
+FUNCTION1	= 0x6e
+HADDR		= 0x88
+HCNT		= 0x8c
+HCNT+0		= 0x8c
+HCNT+1		= 0x8d
+HCNT+2		= 0x8e
+SCBPTR		= 0x90
+INTSTAT		= 0x91
+DFCNTRL		= 0x93
+DFSTATUS	= 0x94
+DFDAT		= 0x99
+QINFIFO		= 0x9b
+QINCNT		= 0x9c
+QOUTFIFO	= 0x9d
+
+SCSICONF	= 0x5a
+
+#  The two reserved bytes at SCBARRAY+1[23] are expected to be set to
+#  zero, and the reserved bit in SCBARRAY+0 is used as an internal flag
+#  to indicate whether or not to reload scatter-gather parameters after
+#  a disconnect.
+#
+SCBARRAY+0	= 0xa0
+SCBARRAY+1	= 0xa1
+SCBARRAY+2	= 0xa2
+SCBARRAY+3	= 0xa3
+SCBARRAY+7	= 0xa7
+SCBARRAY+11	= 0xab
+SCBARRAY+14	= 0xae
+SCBARRAY+15	= 0xaf
+SCBARRAY+16	= 0xb0
+SCBARRAY+17	= 0xb1
+SCBARRAY+18	= 0xb2
+SCBARRAY+19	= 0xb3
+SCBARRAY+20	= 0xb4
+SCBARRAY+21	= 0xb5
+SCBARRAY+22	= 0xb6
+SCBARRAY+23	= 0xb7
+SCBARRAY+24	= 0xb8
+SCBARRAY+25	= 0xb9
+
+SIGNAL_0	= 0x01				# unknown scsi bus phase
+SIGNAL_1	= 0x11				# message reject
+SIGNAL_2	= 0x21				# no IDENTIFY after reconnect
+SIGNAL_3	= 0x31				# no cmd match for reconnect
+SIGNAL_4	= 0x41				# SDTR -> SCSIRATE conversion
+STATUS_ERROR    = 0x51
+
+#  The host adapter card (at least the BIOS) uses 20-2f for SCSI
+#  device information, 32-33 and 5a-5f as well.  Since we don't support
+#  wide or twin-bus SCSI, 28-2f can be reclaimed.  As it turns out, the
+#  BIOS trashes 20-27 anyway, writing the synchronous negotiation results
+#  on top of the BIOS values, so we re-use those for our per-target
+#  scratchspace (actually a value that can be copied directly into
+#  SCSIRATE).  This implies, since we can't get the BIOS config values,
+#  that all targets will be negotiated with for synchronous transfer.
+#  NEEDSDTR has one bit per target indicating if an SDTR message is
+#  needed for that device - this will be set initially, as well as
+#  after a bus reset condition.
+#
+#  The high bit of DROPATN is set if ATN should be dropped before the ACK
+#  when outb is called.  REJBYTE contains the first byte of a MESSAGE IN
+#  message, so the driver can report an intelligible error if a message is
+#  rejected.
+#
+#  RESELECT's high bit is true if we are currently handling a reselect;
+#  its next-highest bit is true ONLY IF we've seen an IDENTIFY message
+#  from the reselecting target.  If we haven't had IDENTIFY, then we have
+#  no idea what the lun is, and we can't select the right SCB register
+#  bank, so force a kernel panic if the target attempts a data in/out or
+#  command phase instead of corrupting something.
+#
+#  Note that SG_NEXT occupies four bytes.
+#
+SYNCNEG		= 0x20
+DISC_DSB_A	= 0x32
+
+DROPATN		= 0x30
+REJBYTE		= 0x31
+RESELECT	= 0x34
+
+MSG_FLAGS	= 0x35
+MSG_LEN		= 0x36
+MSG_START+0	= 0x37
+MSG_START+1	= 0x38
+MSG_START+2	= 0x39
+MSG_START+3	= 0x3a
+MSG_START+4	= 0x3b
+MSG_START+5	= 0x3c
+-MSG_START+0	= 0xc9				# 2's complement of MSG_START+0
+
+ARG_1		= 0x4c				# sdtr conversion args & return
+ARG_2		= 0x4d
+RETURN_1	= 0x4c
+
+SIGSTATE	= 0x4e				# value written to SCSISIGO
+NEEDSDTR	= 0x4f				# send SDTR message, 1 bit/trgt
+
+SG_SIZEOF	= 0x8 				# sizeof(struct scatterlist)
+SG_NOLOAD	= 0x50				# load SG pointer/length?
+SG_COUNT	= 0x51				# working value of SG count
+SG_NEXT		= 0x52				# working value of SG pointer
+SG_NEXT+0	= 0x52
+SG_NEXT+1	= 0x53
+SG_NEXT+2	= 0x54
+SG_NEXT+3	= 0x55
+
+SCBCOUNT	= 0x56				# the actual number of SCBs
+ACTIVE_A	= 0x57
+
+#  Poll QINCNT for work - the lower three bits contain
+#  the number of entries in the Queue In FIFO.
+#
+start:
+	test	SCSISIGI,0x4	jnz reselect	# BSYI
+	test	QINCNT,MAXSCB-1	jz start
+
+#  We have at least one queued SCB now.  Set the SCB pointer
+#  from the FIFO so we see the right bank of SCB registers,
+#  then set SCSI options and set the initiator and target
+#  SCSI IDs.
+#
+	mov	SCBPTR,QINFIFO
+
+# See if there is not already an active SCB for this target.  This code
+# will have to be modified when we add support for dual and wide busses.
+
+	and	FUNCTION1,0x70,SCBARRAY+1
+	mov	A,FUNCTION1
+	test	ACTIVE_A,A      jz active  
+# Place the currently active back on the queue for later processing
+	mov	QINFIFO, SCBPTR
+	jmp	start
+
+# Mark the current target as busy and get working on the SCB
+active:
+	or	ACTIVE_A,A
+	mov	SCBARRAY+1	call initialize
+	clr	SG_NOLOAD
+	clr	RESELECT
+
+#  As soon as we get a successful selection, the target should go
+#  into the message out phase since we have ATN asserted.  Prepare
+#  the message to send, locking out the device driver.  If the device
+#  driver hasn't beaten us with an ABORT or RESET message, then tack
+#  on a SDTR negotation if required.
+#
+#  Messages are stored in scratch RAM starting with a flag byte (high bit
+#  set means active message), one length byte, and then the message itself.
+#
+	mov	SCBARRAY+1	call disconnect	# disconnect ok?
+
+	and	SINDEX,0x7,SCBARRAY+1		# lun
+	or	SINDEX,A			# return value from disconnect
+	or	SINDEX,0x80	call mk_mesg	# IDENTIFY message
+
+	mov	A,SINDEX
+	cmp	MSG_START+0,A	jne !message	# did driver beat us?
+	mvi	MSG_START+1	call mk_sdtr	# build SDTR message if needed
+
+!message:
+
+#  Enable selection phase as an initiator, and do automatic ATN
+#  after the selection.
+#
+	mvi	SCSISEQ,0x48			# ENSELO|ENAUTOATNO
+
+#  Wait for successful arbitration.  The AIC-7770 documentation says
+#  that SELINGO indicates successful arbitration, and that it should
+#  be used to look for SELDO.  However, if the sequencer is paused at
+#  just the right time - a parallel fsck(8) on two drives did it for
+#  me - then SELINGO can flip back to false before we've seen it.  This
+#  makes the sequencer sit in the arbitration loop forever.  This is
+#  Not Good.
+#
+#  Therefore, I've added a check in the arbitration loop for SELDO
+#  too.  This could arguably be made a critical section by disabling
+#  pauses, but I don't want to make a potentially infinite loop a CS.
+#  I suppose you could fold it into the select loop, too, but since
+#  I've been hunting this bug for four days it's kinda like a trophy.
+#
+arbitrate:
+	test	SSTAT0,0x40	jnz *select	# SELDO
+	test	SSTAT0,0x10	jz arbitrate	# SELINGO
+
+#  Wait for a successful selection.  If the hardware selection
+#  timer goes off, then the driver gets the interrupt, so we don't
+#  need to worry about it.
+#
+select:
+	test	SSTAT0,0x40	jz select	# SELDO
+	jmp	*select
+
+#  Reselection is being initiated by a target - we've seen the BSY
+#  line driven active, and we didn't do it!  Enable the reselection
+#  hardware, and wait for it to finish.  Make a note that we've been
+#  reselected, but haven't seen an IDENTIFY message from the target
+#  yet.
+#
+reselect:
+	mvi	SCSISEQ,0x10			# ENRSELI
+
+reselect1:
+	test	SSTAT0,0x20	jz reselect1	# SELDI
+	mov	SELID		call initialize
+
+	mvi	RESELECT,0x80			# reselected, no IDENTIFY
+
+#  After the [re]selection, make sure that the [re]selection enable
+#  bit is off.  This chip is flaky enough without extra things
+#  turned on.  Also clear the BUSFREE bit in SSTAT1 since we'll be
+#  using it shortly.
+#
+*select:
+	clr	SCSISEQ
+	mvi	CLRSINT1,0x8			# CLRBUSFREE
+
+#  Main loop for information transfer phases.  If BSY is false, then
+#  we have a bus free condition, expected or not.  Otherwise, wait
+#  for the target to assert REQ before checking MSG, C/D and I/O
+#  for the bus phase.
+#
+#  We can't simply look at the values of SCSISIGI here (if we want
+#  to do synchronous data transfer), because the target won't assert
+#  REQ if it's already sent us some data that we haven't acknowledged
+#  yet.
+#
+ITloop:
+	test	SSTAT1,0x8	jnz p_busfree	# BUSFREE
+	test	SSTAT1,0x1	jz ITloop	# REQINIT
+
+	and	A,0xe0,SCSISIGI			# CDI|IOI|MSGI
+
+	cmp	ALLZEROS,A	je p_dataout
+	cmp	A,0x40		je p_datain
+	cmp	A,0x80		je p_command
+	cmp	A,0xc0		je p_status
+	cmp	A,0xa0		je p_mesgout
+	cmp	A,0xe0		je p_mesgin
+
+	mvi	INTSTAT,SIGNAL_0		# unknown - signal driver
+
+p_dataout:
+	mvi	0		call scsisig	# !CDO|!IOO|!MSGO
+	call	assert
+	call	sg_load
+
+	mvi	A,3
+	mvi	DINDEX,HCNT
+	mvi	SCBARRAY+23	call bcopy
+
+	mvi	A,3
+	mvi	DINDEX,STCNT
+	mvi	SCBARRAY+23	call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,HADDR
+	mvi	SCBARRAY+19	call bcopy
+
+	mvi	0x3d		call dma	# SCSIEN|SDMAEN|HDMAEN|
+						#   DIRECTION|FIFORESET
+
+#  After a DMA finishes, save the final transfer pointer and count
+#  back into the SCB, in case a device disconnects in the middle of
+#  a transfer.  Use SHADDR and STCNT instead of HADDR and HCNT, since
+#  it's a reflection of how many bytes were transferred on the SCSI
+#  (as opposed to the host) bus.
+#
+	mvi	A,3
+	mvi	DINDEX,SCBARRAY+23
+	mvi	STCNT		call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,SCBARRAY+19
+	mvi	SHADDR		call bcopy
+
+	call	sg_advance
+	mov	SCBARRAY+18,SG_COUNT		# residual S/G count
+
+	jmp	ITloop
+
+p_datain:
+	mvi	0x40		call scsisig	# !CDO|IOO|!MSGO
+	call	assert
+	call	sg_load
+
+	mvi	A,3
+	mvi	DINDEX,HCNT
+	mvi	SCBARRAY+23	call bcopy
+
+	mvi	A,3
+	mvi	DINDEX,STCNT
+	mvi	SCBARRAY+23	call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,HADDR
+	mvi	SCBARRAY+19	call bcopy
+
+	mvi	0x39		call dma	# SCSIEN|SDMAEN|HDMAEN|
+						#   !DIRECTION|FIFORESET
+	mvi	A,3
+	mvi	DINDEX,SCBARRAY+23
+	mvi	STCNT		call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,SCBARRAY+19
+	mvi	SHADDR		call bcopy
+
+	call	sg_advance
+	mov	SCBARRAY+18,SG_COUNT		# residual S/G count
+
+	jmp	ITloop
+
+#  Command phase.  Set up the DMA registers and let 'er rip - the
+#  two bytes after the SCB SCSI_cmd_length are zeroed by the driver,
+#  so we can copy those three bytes directly into HCNT.
+#
+p_command:
+	mvi	0x80		call scsisig	# CDO|!IOO|!MSGO
+	call	assert
+
+	mvi	A,3
+	mvi	DINDEX,HCNT
+	mvi	SCBARRAY+11	call bcopy
+
+	mvi	A,3
+	mvi	DINDEX,STCNT
+	mvi	SCBARRAY+11	call bcopy
+
+	mvi	A,4
+	mvi	DINDEX,HADDR
+	mvi	SCBARRAY+7	call bcopy
+
+	mvi	0x3d		call dma	# SCSIEN|SDMAEN|HDMAEN|
+						#   DIRECTION|FIFORESET
+	jmp	ITloop
+
+#  Status phase.  Wait for the data byte to appear, then read it
+#  and store it into the SCB.
+#
+p_status:
+	mvi	0xc0		call scsisig	# CDO|IOO|!MSGO
+
+	mvi	SCBARRAY+14	call inb
+	jmp	ITloop
+
+#  Message out phase.  If there is no active message, but the target
+#  took us into this phase anyway, build a no-op message and send it.
+#
+p_mesgout:
+	mvi	0xa0		call scsisig	# CDO|!IOO|MSGO
+	mvi	0x8		call mk_mesg	# build NOP message
+
+#  Set up automatic PIO transfer from MSG_START.  Bit 3 in
+#  SXFRCTL0 (SPIOEN) is already on.
+#
+	mvi	SINDEX,MSG_START+0
+	mov	DINDEX,MSG_LEN
+	clr	A
+
+#  When target asks for a byte, drop ATN if it's the last one in
+#  the message.  Otherwise, keep going until the message is exhausted.
+#  (We can't use outb for this since it wants the input in SINDEX.)
+#
+#  Keep an eye out for a phase change, in case the target issues
+#  a MESSAGE REJECT.
+#
+p_mesgout2:
+	test	SSTAT0,0x2	jz p_mesgout2	# SPIORDY
+	test	SSTAT1,0x10	jnz p_mesgout6	# PHASEMIS
+
+	cmp	DINDEX,1	jne p_mesgout3	# last byte?
+	mvi	CLRSINT1,0x40			# CLRATNO - drop ATN
+
+#  Write a byte to the SCSI bus.  The AIC-7770 refuses to automatically
+#  send ACKs in automatic PIO or DMA mode unless you make sure that the
+#  "expected" bus phase in SCSISIGO matches the actual bus phase.  This
+#  behaviour is completely undocumented and caused me several days of
+#  grief.
+#
+#  After plugging in different drives to test with and using a longer
+#  SCSI cable, I found that I/O in Automatic PIO mode ceased to function,
+#  especially when transferring >1 byte.  It seems to be much more stable
+#  if STCNT is set to one before the transfer, and SDONE (in SSTAT0) is
+#  polled for transfer completion - for both output _and_ input.  The
+#  only theory I have is that SPIORDY doesn't drop right away when SCSIDATL
+#  is accessed (like the documentation says it does), and that on a longer
+#  cable run, the sequencer code was fast enough to loop back and see
+#  an SPIORDY that hadn't dropped yet.
+#
+p_mesgout3:
+	call	one_stcnt
+	mov	SCSIDATL,SINDIR
+
+p_mesgout4:
+	test	SSTAT0,0x4	jz p_mesgout4	# SDONE
+	dec	DINDEX
+	inc	A
+	cmp	MSG_LEN,A	jne p_mesgout2
+
+#  If the next bus phase after ATN drops is a message out, it means
+#  that the target is requesting that the last message(s) be resent.
+#
+p_mesgout5:
+	test	SSTAT1,0x8	jnz p_mesgout6	# BUSFREE
+	test	SSTAT1,0x1	jz p_mesgout5	# REQINIT
+
+	and	A,0xe0,SCSISIGI			# CDI|IOI|MSGI
+	cmp	A,0xa0		jne p_mesgout6
+	mvi	0x10		call scsisig	# ATNO - re-assert ATN
+
+	jmp	ITloop
+
+p_mesgout6:
+	mvi	CLRSINT1,0x40			# CLRATNO - in case of PHASEMIS
+	clr	MSG_FLAGS			# no active msg
+	jmp	ITloop
+
+#  Message in phase.  Bytes are read using Automatic PIO mode, but not
+#  using inb.  This alleviates a race condition, namely that if ATN had
+#  to be asserted under Automatic PIO mode, it had to beat the SCSI
+#  circuitry sending an ACK to the target.  This showed up under heavy
+#  loads and really confused things, since ABORT commands wouldn't be
+#  seen by the drive after an IDENTIFY message in until it had changed
+#  to a data I/O phase.
+#
+p_mesgin:
+	mvi	0xe0		call scsisig	# CDO|IOO|MSGO
+	mvi	A		call inb_first	# read the 1st message byte
+	mvi	REJBYTE,A			# save it for the driver
+
+	cmp	ALLZEROS,A	jne p_mesgin1
+
+#  We got a "command complete" message, so put the SCB pointer
+#  into the Queue Out, and trigger a completion interrupt.
+#  Check status for non zero return and interrupt driver if needed
+#  This allows the driver to do a sense command to find out the
+#  source of error.  We don't bother to post to the QOUTFIFO in
+#  the error case since it would require extra work in the kernel
+#  driver to ensure that the entry was removed before the command
+#  complete code tried processing it.
+
+#  First, mark this target as free.
+	and     FUNCTION1,0x70,SCBARRAY+1
+	mov	A,FUNCTION1
+	xor     ACTIVE_A,A 
+
+	test	SCBARRAY+14,0xff	jz status_ok  # 0 Status?
+	call	inb_last			# ack & turn auto PIO back on
+	mvi	INTSTAT,STATUS_ERROR		# let driver know
+	jmp	ITloop
+status_ok:
+	mov	QOUTFIFO,SCBPTR
+	mvi	INTSTAT,0x2			# CMDCMPLT
+	jmp	p_mesgin_done
+
+#  Is it an extended message?  We only support the synchronous data
+#  transfer request message, which will probably be in response to
+#  an SDTR message out from us.  If it's not an SDTR, reject it -
+#  apparently this can be done after any message in byte, according
+#  to the SCSI-2 spec.
+#
+#  XXX - we should really reject this if we didn't initiate the SDTR
+#	 negotiation; this may cause problems with unusual devices.
+#
+p_mesgin1:
+	cmp	A,1		jne p_mesgin2	# extended message code?
+	
+	mvi	A		call inb_next
+	cmp	A,3		jne p_mesginN	# extended mesg length = 3
+	mvi	A		call inb_next
+	cmp	A,1		jne p_mesginN	# SDTR code
+
+	mvi	ARG_1		call inb_next	# xfer period
+	mvi	ARG_2		call inb_next	# REQ/ACK offset
+	mvi	INTSTAT,SIGNAL_4		# call driver to convert
+
+	call	ndx_sdtr			# index sync config for target
+	mov	DINDEX,SINDEX
+	mov	DINDIR,RETURN_1			# save returned value
+
+	not	A				# turn off "need sdtr" flag
+	and	NEEDSDTR,A
+
+#  Even though the SCSI-2 specification says that a device responding
+#  to our SDTR message should honor our parameters for transmitting
+#  to us, it doesn't seem to work too well in real life.  In particular,
+#  a lot of CD-ROM and tape units don't function: try using the SDTR
+#  parameters the device sent us for both transmitting and receiving.
+#
+	mov	SCSIRATE,RETURN_1
+	jmp	p_mesgin_done
+
+#  Is it a disconnect message?  Set a flag in the SCB to remind us
+#  and await the bus going free.
+#
+p_mesgin2:
+	cmp	A,4		jne p_mesgin3	# disconnect code?
+
+	or	SCBARRAY+0,0x4			# set "disconnected" bit
+	jmp	p_mesgin_done
+
+#  Save data pointers message?  Copy working values into the SCB,
+#  usually in preparation for a disconnect.
+#
+p_mesgin3:
+	cmp	A,2		jne p_mesgin4	# save data pointers code?
+
+	call	sg_ram2scb
+	jmp	p_mesgin_done
+
+#  Restore pointers message?  Data pointers are recopied from the
+#  SCB anyway at the start of any DMA operation, so the only thing
+#  to copy is the scatter-gather values.
+#
+p_mesgin4:
+	cmp	A,3		jne p_mesgin5	# restore pointers code?
+
+	call	sg_scb2ram
+	jmp	p_mesgin_done
+
+#  Identify message?  For a reconnecting target, this tells us the lun
+#  that the reconnection is for - find the correct SCB and switch to it,
+#  clearing the "disconnected" bit so we don't "find" it by accident later.
+#
+p_mesgin5:
+	test	A,0x80		jz p_mesgin6	# identify message?
+
+	test	A,0x78		jnz p_mesginN	# !DiscPriv|!LUNTAR|!Reserved
+
+	mov	A		call findSCB	# switch to correct SCB
+
+#  If a active message is present after calling findSCB, then either it
+#  or the driver is trying to abort the command.  Either way, something
+#  untoward has happened and we should just leave it alone.
+#
+	test	MSG_FLAGS,0x80	jnz p_mesgin_done
+
+	xor	SCBARRAY+0,0x4			# clear disconnect bit in SCB
+	mvi	RESELECT,0xc0			# make note of IDENTIFY
+
+	call	sg_scb2ram			# implied restore pointers
+						#   required on reselect
+	jmp	p_mesgin_done
+
+#  Message reject?  If we have an outstanding SDTR negotiation, assume
+#  that it's a response from the target selecting asynchronous transfer,
+#  otherwise just ignore it since we have no clue what it pertains to.
+#
+#  XXX - I don't have a device that responds this way.  Does this code
+#	 actually work?
+#
+p_mesgin6:
+	cmp	A,7		jne p_mesgin7	# message reject code?
+
+	and	FUNCTION1,0x70,SCSIID		# outstanding SDTR message?
+	mov	A,FUNCTION1
+	test	NEEDSDTR,A	jz p_mesgin_done  # no - ignore rejection
+
+	call	ndx_sdtr			# note use of asynch xfer
+	mov	DINDEX,SINDEX
+	clr	DINDIR
+
+	not	A				# turn off "active sdtr" flag
+	and	NEEDSDTR,A
+
+	clr	SCSIRATE			# select asynch xfer
+	jmp	p_mesgin_done
+
+#  [ ADD MORE MESSAGE HANDLING HERE ]
+#
+p_mesgin7:
+
+#  We have no idea what this message in is, and there's no way
+#  to pass it up to the kernel, so we issue a message reject and
+#  hope for the best.  Since we're now using manual PIO mode to
+#  read in the message, there should no longer be a race condition
+#  present when we assert ATN.  In any case, rejection should be a
+#  rare occurrence - signal the driver when it happens.
+#
+p_mesginN:
+	or	SINDEX,0x10,SIGSTATE		# turn on ATNO
+	call	scsisig
+	mvi	INTSTAT,SIGNAL_1		# let driver know
+
+	mvi	0x7		call mk_mesg	# MESSAGE REJECT message
+
+p_mesgin_done:
+	call	inb_last			# ack & turn auto PIO back on
+	jmp	ITloop
+
+#  Bus free phase.  It might be useful to interrupt the device
+#  driver if we aren't expecting this.  For now, make sure that
+#  ATN isn't being asserted and look for a new command.
+#
+p_busfree:
+	mvi	CLRSINT1,0x40			# CLRATNO
+	clr	SIGSTATE
+	jmp	start
+
+#  Bcopy: number of bytes to transfer should be in A, DINDEX should
+#  contain the destination address, and SINDEX should contain the
+#  source address.  All input parameters are trashed on return.
+#
+bcopy:
+	mov	DINDIR,SINDIR
+	dec	A
+	cmp	ALLZEROS,A	jne bcopy
+	ret
+
+#  Locking the driver out, build a one-byte message passed in SINDEX
+#  if there is no active message already.  SINDEX is returned intact.
+#
+mk_mesg:
+	mvi	SEQCTL,0x40			# PAUSEDIS
+	test	MSG_FLAGS,0x80	jnz mk_mesg1	# active message?
+
+	mvi	MSG_FLAGS,0x80			# if not, there is now
+	mvi	MSG_LEN,1			# length = 1
+	mov	MSG_START+0,SINDEX		# 1-byte message
+
+mk_mesg1:
+	clr	SEQCTL				# !PAUSEDIS
+	ret
+
+#  Input byte in Automatic PIO mode.  The address to store the byte
+#  in should be in SINDEX.  DINDEX will be used by this routine.
+#
+inb:
+	test	SSTAT0,0x2	jz inb		# SPIORDY
+	mov	DINDEX,SINDEX
+	call	one_stcnt			# xfer one byte
+	mov	DINDIR,SCSIDATL
+inb1:
+	test	SSTAT0,0x4	jz inb1		# SDONE - wait to "finish"
+	ret
+
+#  Carefully read data in Automatic PIO mode.  I first tried this using
+#  Manual PIO mode, but it gave me continual underrun errors, probably
+#  indicating that I did something wrong, but I feel more secure leaving
+#  Automatic PIO on all the time.
+#
+#  According to Adaptec's documentation, an ACK is not sent on input from
+#  the target until SCSIDATL is read from.  So we wait until SCSIDATL is
+#  latched (the usual way), then read the data byte directly off the bus
+#  using SCSIBUSL.  When we have pulled the ATN line, or we just want to
+#  acknowledge the byte, then we do a dummy read from SCISDATL.  The SCSI
+#  spec guarantees that the target will hold the data byte on the bus until
+#  we send our ACK.
+#
+#  The assumption here is that these are called in a particular sequence,
+#  and that REQ is already set when inb_first is called.  inb_{first,next}
+#  use the same calling convention as inb.
+#
+inb_first:
+	mov	DINDEX,SINDEX
+	mov	DINDIR,SCSIBUSL	ret		# read byte directly from bus
+
+inb_next:
+	mov	DINDEX,SINDEX			# save SINDEX
+
+	call	one_stcnt			# xfer one byte
+	mov	NONE,SCSIDATL			# dummy read from latch to ACK
+inb_next1:
+	test	SSTAT0,0x4	jz inb_next1	# SDONE
+inb_next2:
+	test	SSTAT0,0x2	jz inb_next2	# SPIORDY - wait for next byte
+	mov	DINDIR,SCSIBUSL	ret		# read byte directly from bus
+
+inb_last:
+	call	one_stcnt			# ACK with dummy read
+	mov	NONE,SCSIDATL
+inb_last1:
+	test	SSTAT0,0x4	jz inb_last1	# wait for completion
+	ret
+
+#  Output byte in Automatic PIO mode.  The byte to output should be
+#  in SINDEX.  If DROPATN's high bit is set, then ATN will be dropped
+#  before the byte is output.
+#
+outb:
+	test	SSTAT0,0x2	jz outb		# SPIORDY
+	call	one_stcnt			# xfer one byte
+
+	test	DROPATN,0x80	jz outb1
+	mvi	CLRSINT1,0x40			# CLRATNO
+	clr	DROPATN
+outb1:
+	mov	SCSIDATL,SINDEX
+outb2:
+	test	SSTAT0,0x4	jz outb2	# SDONE
+	ret
+
+#  Write the value "1" into the STCNT registers, for Automatic PIO
+#  transfers.
+#
+one_stcnt:
+	clr	STCNT+2
+	clr	STCNT+1
+	mvi	STCNT+0,1	ret
+
+#  DMA data transfer.  HADDR and HCNT must be loaded first, and
+#  SINDEX should contain the value to load DFCNTRL with - 0x3d for
+#  host->scsi, or 0x39 for scsi->host.  The SCSI channel is cleared
+#  during initialization.
+#
+dma:
+	mov	DFCNTRL,SINDEX
+dma1:
+dma2:
+	test	SSTAT0,0x1	jnz dma3	# DMADONE
+	test	SSTAT1,0x10	jz dma1		# PHASEMIS, ie. underrun
+
+#  We will be "done" DMAing when the transfer count goes to zero, or
+#  the target changes the phase (in light of this, it makes sense that
+#  the DMA circuitry doesn't ACK when PHASEMIS is active).  If we are
+#  doing a SCSI->Host transfer, flush the data FIFO.
+#
+dma3:
+	test	SINDEX,0x4	jnz dma5	# DIRECTION
+	and	SINDEX,0xfe			# mask out FIFORESET
+	or	DFCNTRL,0x2,SINDEX		# FIFOFLUSH
+dma4:
+	test	DFCNTRL,0x2	jnz dma4	# FIFOFLUSHACK
+
+#  Now shut the DMA enables off, and copy STCNT (ie. the underrun
+#  amount, if any) to the SCB registers; SG_COUNT will get copied to
+#  the SCB's residual S/G count field after sg_advance is called.  Make
+#  sure that the DMA enables are actually off first lest we get an ILLSADDR.
+#
+dma5:
+	clr	DFCNTRL				# disable DMA
+dma6:
+	test	DFCNTRL,0x38	jnz dma6	# SCSIENACK|SDMAENACK|HDMAENACK
+
+	mvi	A,3
+	mvi	DINDEX,SCBARRAY+15
+	mvi	STCNT		call bcopy
+
+	ret
+
+#  Common SCSI initialization for selection and reselection.  Expects
+#  the target SCSI ID to be in the upper four bits of SINDEX, and A's
+#  contents are stomped on return.
+#
+initialize:
+	clr	SBLKCTL				# channel A, !wide
+	and	SCSIID,0xf0,SINDEX		# target ID
+	and	A,0x7,SCSICONF			# SCSI_ID_A[210]
+	or	SCSIID,A
+
+#  Esundry initialization.
+#
+	clr	DROPATN
+	clr	SIGSTATE
+
+#  Turn on Automatic PIO mode now, before we expect to see an REQ
+#  from the target.  It shouldn't hurt anything to leave it on.  Set
+#  CLRCHN here before the target has entered a data transfer mode -
+#  with synchronous SCSI, if you do it later, you blow away some
+#  data in the SCSI FIFO that the target has already sent to you.
+#
+	mvi	SXFRCTL0,0xa			# SPIOEN|CLRCHN
+
+#  Set SCSI bus parity checking and the selection timeout value,
+#  and enable the hardware selection timer.  Set the SELTO interrupt
+#  to signal the driver.
+#
+	and	A,0x38,SCSICONF			# PARITY_ENB_A|SEL_TIM_A[10]
+	or	SXFRCTL1,0x4,A			# ENSTIMER
+	mvi	SIMODE1,0x84			# ENSELTIMO|ENSCSIPERR
+	
+#  Initialize scatter-gather pointers by setting up the working copy
+#  in scratch RAM.
+#
+	call	sg_scb2ram
+
+#  Initialize SCSIRATE with the appropriate value for this target.
+#
+	call	ndx_sdtr
+	mov	SCSIRATE,SINDIR
+	ret
+
+#  Assert that if we've been reselected, then we've seen an IDENTIFY
+#  message.
+#
+assert:
+	test	RESELECT,0x80	jz assert1	# reselected?
+	test	RESELECT,0x40	jnz assert1	# seen IDENTIFY?
+
+	mvi	INTSTAT,SIGNAL_2		# no - cause a kernel panic
+
+assert1:
+	ret
+
+#  Find out if disconnection is ok from the information the BIOS has left
+#  us.  The target ID should be in the upper four bits of SINDEX; A will
+#  contain either 0x40 (disconnection ok) or 0x00 (diconnection not ok)
+#  on exit.
+#
+#  This is the only place the target ID is limited to three bits, so we
+#  can use the FUNCTION1 register.
+#
+disconnect:
+	and	FUNCTION1,0x70,SINDEX		# strip off extra just in case
+	mov	A,FUNCTION1
+	test	DISC_DSB_A,A	jz disconnect1	# bit nonzero if DISabled
+
+	clr	A		ret
+disconnect1:
+	mvi	A,0x40		ret
+
+#  Locate the SCB matching the target ID in SELID and the lun in the lower
+#  three bits of SINDEX, and switch the SCB to it.  Have the kernel print
+#  a warning message if it can't be found, and generate an ABORT message
+#  to the target.  We keep the value of the t/c/l that we are trying to 
+#  in DINDEX so it is not overwritten during our check to see if we are
+#  at the last SCB.
+#
+findSCB:
+	and	A,0x7,SINDEX		# lun in lower three bits
+	or	DINDEX,A,SELID		# can I do this?
+	and	DINDEX,0xf7		# only channel A implemented
+
+	clr	SINDEX
+
+findSCB1:
+	mov	SCBPTR,SINDEX			# switch to new SCB
+	mov	A,DINDEX
+	cmp	SCBARRAY+1,A	jne findSCB2	# target ID/channel/lun match?
+	test	SCBARRAY+0,0x4	jz findSCB2	# should be disconnected
+
+	ret
+
+findSCB2:
+	inc	SINDEX
+	mov	A,SCBCOUNT
+	cmp	SINDEX,A	jne findSCB1
+
+	mvi	INTSTAT,SIGNAL_3		# not found - signal kernel
+	mvi	0x6		call mk_mesg	# ABORT message
+
+	or	SINDEX,0x10,SIGSTATE		# assert ATNO
+	call	scsisig
+	ret
+
+#  Make a working copy of the scatter-gather parameters in the SCB.
+#
+sg_scb2ram:
+	mov	SG_COUNT,SCBARRAY+2
+
+	mvi	A,4
+	mvi	DINDEX,SG_NEXT
+	mvi	SCBARRAY+3	call bcopy
+
+	mvi	SG_NOLOAD,0x80
+	test	SCBARRAY+0,0x10	jnz sg_scb2ram1	# don't reload s/g?
+	clr	SG_NOLOAD
+
+sg_scb2ram1:
+	ret
+
+#  Copying RAM values back to SCB, for Save Data Pointers message.
+#
+sg_ram2scb:
+	mov	SCBARRAY+2,SG_COUNT
+
+	mvi	A,4
+	mvi	DINDEX,SCBARRAY+3
+	mvi	SG_NEXT		call bcopy
+
+	and	SCBARRAY+0,0xef,SCBARRAY+0
+	test	SG_NOLOAD,0x80	jz sg_ram2scb1	# reload s/g?
+	or	SCBARRAY+0,0x10
+
+sg_ram2scb1:
+	ret
+
+#  Load a struct scatter if needed and set up the data address and
+#  length.  If the working value of the SG count is nonzero, then
+#  we need to load a new set of values.
+#
+#  This, like the above DMA, assumes a little-endian host data storage.
+#
+sg_load:
+	test	SG_COUNT,0xff	jz sg_load3	# SG being used?
+	test	SG_NOLOAD,0x80	jnz sg_load3	# don't reload s/g?
+
+	clr	HCNT+2
+	clr	HCNT+1
+	mvi	HCNT+0,SG_SIZEOF
+
+	mvi	A,4
+	mvi	DINDEX,HADDR
+	mvi	SG_NEXT		call bcopy
+
+	mvi	DFCNTRL,0xd			# HDMAEN|DIRECTION|FIFORESET
+
+#  Wait for DMA from host memory to data FIFO to complete, then disable
+#  DMA and wait for it to acknowledge that it's off.
+#
+sg_load1:
+	test	DFSTATUS,0x8	jz sg_load1	# HDONE
+
+	clr	DFCNTRL				# disable DMA
+sg_load2:
+	test	DFCNTRL,0x8	jnz sg_load2	# HDMAENACK
+
+#  Copy data from FIFO into SCB data pointer and data count.  This assumes
+#  that the struct scatterlist has this structure (this and sizeof(struct
+#  scatterlist) == 12 are asserted in aic7xxx.c):
+#
+#	struct scatterlist {
+#		char *address;		/* four bytes, little-endian order */
+#		...			/* four bytes, ignored */
+#		unsigned short length;	/* two bytes, little-endian order */
+#	}
+#
+
+# Not in FreeBSD.  the scatter list is only 8 bytes.
+# 
+# struct ahc_dma_seg {
+#       physaddr addr;                  /* four bytes, little-endian order */
+#       long    len;                    /* four bytes, little endian order */   
+# };
+#
+
+	mov	SCBARRAY+19,DFDAT		# new data address
+	mov	SCBARRAY+20,DFDAT
+	mov	SCBARRAY+21,DFDAT
+	mov	SCBARRAY+22,DFDAT
+
+	mov	SCBARRAY+23,DFDAT
+	mov	SCBARRAY+24,DFDAT
+	mov	SCBARRAY+25,DFDAT
+	mov	NONE,DFDAT			#Only support 24 bit length.
+
+sg_load3:
+	ret
+
+#  Advance the scatter-gather pointers only IF NEEDED.  If SG is enabled,
+#  and the SCSI transfer count is zero (note that this should be called
+#  right after a DMA finishes), then move the working copies of the SG
+#  pointer/length along.  If the SCSI transfer count is not zero, then
+#  presumably the target is disconnecting - do not reload the SG values
+#  next time.
+#
+sg_advance:
+	test	SG_COUNT,0xff	jz sg_advance2	# s/g enabled?
+
+	test	STCNT+0,0xff	jnz sg_advance1	# SCSI transfer count nonzero?
+	test	STCNT+1,0xff	jnz sg_advance1
+	test	STCNT+2,0xff	jnz sg_advance1
+
+	clr	SG_NOLOAD			# reload s/g next time
+	dec	SG_COUNT			# one less segment to go
+
+	clr	A				# add sizeof(struct scatter)
+	add	SG_NEXT+0,SG_SIZEOF,SG_NEXT+0
+	adc	SG_NEXT+1,A,SG_NEXT+1
+	adc	SG_NEXT+2,A,SG_NEXT+2
+	adc	SG_NEXT+3,A,SG_NEXT+3
+
+	ret
+
+sg_advance1:
+	mvi	SG_NOLOAD,0x80			# don't reload s/g next time
+sg_advance2:
+	ret
+
+#  Add the array base SYNCNEG to the target offset (the target address
+#  is in SCSIID), and return the result in SINDEX.  The accumulator
+#  contains the 3->8 decoding of the target ID on return.
+#
+ndx_sdtr:
+	shr	A,SCSIID,4
+	and	A,0x7
+	add	SINDEX,SYNCNEG,A
+
+	and	FUNCTION1,0x70,SCSIID		# 3-bit target address decode
+	mov	A,FUNCTION1	ret
+
+#  If we need to negotiate transfer parameters, build the SDTR message
+#  starting at the address passed in SINDEX.  DINDEX is modified on return.
+#
+mk_sdtr:
+	mov	DINDEX,SINDEX			# save SINDEX
+
+	call	ndx_sdtr
+	test	NEEDSDTR,A	jnz mk_sdtr1	# do we need negotiation?
+	ret
+
+mk_sdtr1:
+	mvi	DINDIR,1			# extended message
+	mvi	DINDIR,3			# extended message length = 3
+	mvi	DINDIR,1			# SDTR code
+	mvi	DINDIR,25			# REQ/ACK transfer period
+	mvi	DINDIR,15			# REQ/ACK offset
+
+	add	MSG_LEN,-MSG_START+0,DINDEX	# update message length
+	ret
+
+#  Set SCSI bus control signal state.  This also saves the last-written
+#  value into a location where the higher-level driver can read it - if
+#  it has to send an ABORT or RESET message, then it needs to know this
+#  so it can assert ATN without upsetting SCSISIGO.  The new value is
+#  expected in SINDEX.  Change the actual state last to avoid contention
+#  from the driver.
+#
+scsisig:
+	mov	SIGSTATE,SINDEX
+	mov	SCSISIGO,SINDEX	ret
+