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Annotation of Gnu-Mach/scsi/scsi_comm.c, revision 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 */

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