Initial source

1 files changed, 108 insertions, 0 deletions

diff --git a/scsi/rz_host.c b/scsi/rz_host.c
new file mode 100644
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--- /dev/null
+++ b/scsi/rz_host.c
@@ -0,0 +1,108 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File: rz_host.c
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	7/91
+ *
+ *	Top layer of the SCSI driver: interface with the MI.
+ *	This file contains operations specific to CPU-like devices.
+ *
+ * We handle here the case of other hosts that are capable of
+ * sophisticated host-to-host communication protocols, we make
+ * them look like... you'll see.
+ *
+ * There are two sides of the coin here: when we take the initiative
+ * and when the other host does it.  Code for handling both cases is
+ * provided in this one file.
+ */
+
+#include <mach/std_types.h>
+#include <machine/machspl.h>		/* spl definitions */
+#include <scsi/compat_30.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_defs.h>
+#include <scsi/rz.h>
+
+#if  (NSCSI > 0)
+/* Since we have invented a new "device" this cannot go into the
+   the 'official' scsi_devsw table.  Too bad. */
+
+extern char	*schost_name();
+extern scsi_ret_t
+		schost_open(), schost_close();
+extern int	schost_strategy();
+extern void	schost_start();
+
+scsi_devsw_t	scsi_host = {
+	schost_name, 0, schost_open, schost_close, schost_strategy,
+	schost_start, 0, 0
+};
+
+char *schost_name(internal)
+	boolean_t	internal;
+{
+	return internal ? "sh" : "host";
+}
+
+scsi_ret_t
+schost_open(tgt)
+	target_info_t	*tgt;
+{
+	return SCSI_RET_SUCCESS;	/* XXX if this is it, drop it */
+}
+
+scsi_ret_t
+schost_close(tgt)
+	target_info_t	*tgt;
+{
+	return SCSI_RET_SUCCESS;	/* XXX if this is it, drop it */
+}
+
+schost_strategy(ior)
+	register io_req_t	ior;
+{
+	return rz_simpleq_strategy( ior, schost_start);
+}
+
+void
+schost_start( tgt, done)
+	target_info_t	*tgt;
+	boolean_t	done;
+{
+	io_req_t		head, ior;
+	scsi_ret_t		ret;
+
+	if (done || (!tgt->dev_info.cpu.req_pending)) {
+		sccpu_start( tgt, done);
+		return;
+	}
+
+	ior = tgt->ior;
+}
+
+#endif  /* NSCSI > 0 */