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Annotation of Gnu-Mach/scsi/scsi_cpu.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_cpu.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 PROCESSOR devices.
                     34:  */
                     35: 
                     36: #include <mach/std_types.h>
                     37: #include <scsi/compat_30.h>
                     38: 
                     39: #include <scsi/scsi.h>
                     40: #include <scsi/scsi2.h>
                     41: #include <scsi/scsi_defs.h>
                     42: 
                     43: #if  (NSCSI > 0)
                     44: 
                     45: char *sccpu_name(internal)
                     46:        boolean_t       internal;
                     47: {
                     48:        return internal ? "sc" : "cpu";
                     49: }
                     50: 
                     51: void scsi_send( tgt, ior)
                     52:        register target_info_t  *tgt;
                     53:        io_req_t                ior;
                     54: {
                     55:        scsi_cmd_write_t        *cmd;
                     56:        unsigned                len;    /* in bytes */
                     57:        unsigned int            max_dma_data;
                     58: 
                     59:        max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
                     60: 
                     61:        len = ior->io_count;
                     62:        if (len > max_dma_data)
                     63:                len = max_dma_data;
                     64:        if (len < tgt->block_size)
                     65:                len = tgt->block_size;
                     66: 
                     67:        cmd = (scsi_cmd_write_t*) (tgt->cmd_ptr);
                     68:        cmd->scsi_cmd_code = SCSI_CMD_SEND;
                     69:        cmd->scsi_cmd_lun_and_lba1 = 0;
                     70:        cmd->scsi_cmd_lba2         = len >> 16;
                     71:        cmd->scsi_cmd_lba3         = len >> 8;
                     72:        cmd->scsi_cmd_xfer_len     = len;
                     73:        cmd->scsi_cmd_ctrl_byte = 0;    /* not linked */
                     74:        
                     75:        tgt->cur_cmd = SCSI_CMD_SEND;
                     76: 
                     77:        scsi_go(tgt, sizeof(*cmd), 0, FALSE);
                     78: }
                     79: 
                     80: void scsi_receive( tgt, ior)
                     81:        register target_info_t  *tgt;
                     82:        io_req_t                ior;
                     83: {
                     84:        scsi_cmd_read_t         *cmd;
                     85:        register unsigned       len;
                     86:        unsigned int            max_dma_data;
                     87: 
                     88:        max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
                     89: 
                     90:        len = ior->io_count;
                     91:        if (len > max_dma_data)
                     92:                len = max_dma_data;
                     93:        if (len < tgt->block_size)
                     94:                len = tgt->block_size;
                     95: 
                     96:        cmd = (scsi_cmd_read_t*) (tgt->cmd_ptr);
                     97:        cmd->scsi_cmd_code = SCSI_CMD_RECEIVE;
                     98:        cmd->scsi_cmd_lun_and_lba1 = 0;
                     99:        cmd->scsi_cmd_lba2         = len >> 16;
                    100:        cmd->scsi_cmd_lba3         = len >>  8;
                    101:        cmd->scsi_cmd_xfer_len     = len;
                    102:        cmd->scsi_cmd_ctrl_byte = 0;    /* not linked */
                    103:        
                    104:        tgt->cur_cmd = SCSI_CMD_RECEIVE;
                    105: 
                    106:        scsi_go(tgt, sizeof(*cmd), len, FALSE);
                    107: }
                    108: 
                    109: #endif  /* NSCSI > 0 */

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