Return to rz_host.c CVS log

Up to [GnuMach] / Gnu-Mach / scsi

Annotation of Gnu-Mach/scsi/rz_host.c, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Mach Operating System
                      3:  * Copyright (c) 1991,1990 Carnegie Mellon University
                      4:  * All Rights Reserved.
                      5:  * 
                      6:  * Permission to use, copy, modify and distribute this software and its
                      7:  * documentation is hereby granted, provided that both the copyright
                      8:  * notice and this permission notice appear in all copies of the
                      9:  * software, derivative works or modified versions, and any portions
                     10:  * thereof, and that both notices appear in supporting documentation.
                     11:  * 
                     12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     15:  * 
                     16:  * Carnegie Mellon requests users of this software to return to
                     17:  * 
                     18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
                     22:  * 
                     23:  * any improvements or extensions that they make and grant Carnegie Mellon
                     24:  * the rights to redistribute these changes.
                     25:  */
                     26: /*
                     27:  *     File: rz_host.c
                     28:  *     Author: Alessandro Forin, Carnegie Mellon University
                     29:  *     Date:   7/91
                     30:  *
                     31:  *     Top layer of the SCSI driver: interface with the MI.
                     32:  *     This file contains operations specific to CPU-like devices.
                     33:  *
                     34:  * We handle here the case of other hosts that are capable of
                     35:  * sophisticated host-to-host communication protocols, we make
                     36:  * them look like... you'll see.
                     37:  *
                     38:  * There are two sides of the coin here: when we take the initiative
                     39:  * and when the other host does it.  Code for handling both cases is
                     40:  * provided in this one file.
                     41:  */
                     42: 
                     43: #include <mach/std_types.h>
                     44: #include <machine/machspl.h>           /* spl definitions */
                     45: #include <scsi/compat_30.h>
                     46: 
                     47: #include <scsi/scsi.h>
                     48: #include <scsi/scsi_defs.h>
                     49: #include <scsi/rz.h>
                     50: 
                     51: #if  (NSCSI > 0)
                     52: /* Since we have invented a new "device" this cannot go into the
                     53:    the 'official' scsi_devsw table.  Too bad. */
                     54: 
                     55: extern char    *schost_name();
                     56: extern scsi_ret_t
                     57:                schost_open(), schost_close();
                     58: extern int     schost_strategy();
                     59: extern void    schost_start();
                     60: 
                     61: scsi_devsw_t   scsi_host = {
                     62:        schost_name, 0, schost_open, schost_close, schost_strategy,
                     63:        schost_start, 0, 0
                     64: };
                     65: 
                     66: char *schost_name(internal)
                     67:        boolean_t       internal;
                     68: {
                     69:        return internal ? "sh" : "host";
                     70: }
                     71: 
                     72: scsi_ret_t
                     73: schost_open(tgt)
                     74:        target_info_t   *tgt;
                     75: {
                     76:        return SCSI_RET_SUCCESS;        /* XXX if this is it, drop it */
                     77: }
                     78: 
                     79: scsi_ret_t
                     80: schost_close(tgt)
                     81:        target_info_t   *tgt;
                     82: {
                     83:        return SCSI_RET_SUCCESS;        /* XXX if this is it, drop it */
                     84: }
                     85: 
                     86: schost_strategy(ior)
                     87:        register io_req_t       ior;
                     88: {
                     89:        return rz_simpleq_strategy( ior, schost_start);
                     90: }
                     91: 
                     92: void
                     93: schost_start( tgt, done)
                     94:        target_info_t   *tgt;
                     95:        boolean_t       done;
                     96: {
                     97:        io_req_t                head, ior;
                     98:        scsi_ret_t              ret;
                     99: 
                    100:        if (done || (!tgt->dev_info.cpu.req_pending)) {
                    101:                sccpu_start( tgt, done);
                    102:                return;
                    103:        }
                    104: 
                    105:        ior = tgt->ior;
                    106: }
                    107: 
                    108: #endif  /* NSCSI > 0 */

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.