Return to scsi_comm.c CVS log

Up to [GnuMach] / Gnu-Mach / scsi

Annotation of Gnu-Mach/scsi/scsi_comm.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: scsi_comm.c
                     28:  *     Author: Alessandro Forin, Carnegie Mellon University
                     29:  *     Date:   10/90
                     30:  *
                     31:  *     Middle layer of the SCSI driver: SCSI protocol implementation
                     32:  *
                     33:  * This file contains code for SCSI commands for COMMUNICATION devices.
                     34:  */
                     35: 
                     36: #include <mach/std_types.h>
                     37: #include <scsi/compat_30.h>
                     38: 
                     39: #include <scsi/scsi.h>
                     40: #include <scsi/scsi_defs.h>
                     41: 
                     42: #if  (NSCSI > 0)
                     43: 
                     44: char *sccomm_name(
                     45:        boolean_t       internal)
                     46: {
                     47:        return internal ? "cz" : "comm";
                     48: }
                     49: 
                     50: void scsi_get_message(
                     51:        register target_info_t  *tgt,
                     52:        io_req_t                ior)
                     53: {
                     54:        scsi_cmd_read_t         *cmd;
                     55:        register unsigned       len, max;
                     56: 
                     57:        max = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
                     58: 
                     59:        len = ior->io_count;
                     60:        if (len > max) {
                     61:                ior->io_residual = len - max;
                     62:                len = max;
                     63:        }
                     64: 
                     65:        cmd = (scsi_cmd_read_t*) (tgt->cmd_ptr);
                     66:        cmd->scsi_cmd_code = SCSI_CMD_GET_MESSAGE;
                     67:        cmd->scsi_cmd_lun_and_lba1 = tgt->lun << SCSI_LUN_SHIFT;
                     68:        cmd->scsi_cmd_lba2         = len >> 16;
                     69:        cmd->scsi_cmd_lba3         = len >>  8;
                     70:        cmd->scsi_cmd_xfer_len     = len;
                     71:        cmd->scsi_cmd_ctrl_byte = 0;    /* not linked */
                     72:        
                     73:        tgt->cur_cmd = SCSI_CMD_GET_MESSAGE;
                     74: 
                     75:        scsi_go(tgt, sizeof(*cmd), len, FALSE);
                     76: }
                     77: 
                     78: void scsi_send_message(
                     79:        register target_info_t  *tgt,
                     80:        io_req_t                ior)
                     81: {
                     82:        scsi_cmd_write_t        *cmd;
                     83:        register unsigned       len, max;
                     84: 
                     85:        len = ior->io_count;
                     86:        max = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
                     87: 
                     88:        if (len > max) {
                     89:                ior->io_residual = len - max;
                     90:                len = max;
                     91:        }
                     92: 
                     93:        cmd = (scsi_cmd_write_t*) (tgt->cmd_ptr);
                     94:        cmd->scsi_cmd_code = SCSI_CMD_SEND_MESSAGE;
                     95:        cmd->scsi_cmd_lun_and_lba1 = tgt->lun << SCSI_LUN_SHIFT;
                     96:        cmd->scsi_cmd_lba2         = len >> 16;
                     97:        cmd->scsi_cmd_lba3         = len >>  8;
                     98:        cmd->scsi_cmd_xfer_len     = len;
                     99:        cmd->scsi_cmd_ctrl_byte = 0;    /* not linked */
                    100:        
                    101:        tgt->cur_cmd = SCSI_CMD_SEND_MESSAGE;
                    102: 
                    103:        scsi_go(tgt, sizeof(*cmd), 0, FALSE);
                    104: }
                    105: 
                    106: 
                    107: #if 0
                    108: /* For now, these are not needed */
                    109: scsi_get_message_long
                    110: scsi_get_message_vlong
                    111: scsi_send_message_long
                    112: scsi_send_message_vlong
                    113: #endif
                    114: 
                    115: #endif  /* NSCSI > 0 */

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