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scsipi_base.h revision 1.3 
      1 /*	$NetBSD: scsipi_base.h,v 1.3 1997/09/19 23:53:33 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994, 1995, 1997 Charles M. Hannum.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by Charles M. Hannum.
     17  * 4. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Originally written by Julian Elischer (julian (at) dialix.oz.au)
     34  */
     35 
     36 extern LIST_HEAD(xs_free_list, scsipi_xfer) xs_free_list;
     37 
     38 struct scsipi_xfer *scsipi_get_xs __P((struct scsipi_link *, int));
     39 void scsipi_free_xs __P((struct scsipi_xfer *, int));
     40 
     41 static __inline struct scsipi_xfer *scsipi_make_xs __P((struct scsipi_link *,
     42 	    struct scsipi_generic *, int cmdlen, u_char *data_addr,
     43 	    int datalen, int retries, int timeout, struct buf *,
     44 	    int flags)) __attribute__ ((unused));
     45 
     46 /*
     47  * Make a scsipi_xfer, and return a pointer to it.
     48  */
     49 
     50 static __inline struct scsipi_xfer *
     51 scsipi_make_xs(sc_link, scsipi_cmd, cmdlen, data_addr, datalen,
     52     retries, timeout, bp, flags)
     53 	struct scsipi_link *sc_link;
     54 	struct scsipi_generic *scsipi_cmd;
     55 	int cmdlen;
     56 	u_char *data_addr;
     57 	int datalen;
     58 	int retries;
     59 	int timeout;
     60 	struct buf *bp;
     61 	int flags;
     62 {
     63 	struct scsipi_xfer *xs;
     64 
     65 	if ((xs = scsipi_get_xs(sc_link, flags)) == NULL)
     66 		return NULL;
     67 
     68 	/*
     69 	 * Fill out the scsipi_xfer structure.  We don't know whose context
     70 	 * the cmd is in, so copy it.
     71 	 */
     72 	xs->sc_link = sc_link;
     73 	bcopy(scsipi_cmd, &xs->cmdstore, cmdlen);
     74 	xs->cmd = &xs->cmdstore;
     75 	xs->cmdlen = cmdlen;
     76 	xs->data = data_addr;
     77 	xs->datalen = datalen;
     78 	xs->retries = retries;
     79 	xs->timeout = timeout;
     80 	xs->bp = bp;
     81 
     82 	/*
     83 	 * Set the LUN in the CDB if we have an older device.  We also
     84 	 * set it for more modern SCSI-II devices "just in case".
     85 	 */
     86 
     87 	if ((sc_link->type == BUS_SCSI) &&
     88 		((sc_link->scsipi_scsi.scsi_version & SID_ANSII) <= 2))
     89 		xs->cmd->bytes[0] |=
     90 		    ((sc_link->scsipi_scsi.lun << SCSI_CMD_LUN_SHIFT) &
     91 			SCSI_CMD_LUN_MASK);
     92 
     93 	return xs;
     94 }
     95