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/*
* 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 */
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