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diff --git a/scsi/scsi_cpu.c b/scsi/scsi_cpu.c
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * File: scsi_cpu.c
+ * Author: Alessandro Forin, Carnegie Mellon University
+ * Date: 10/90
+ *
+ * Middle layer of the SCSI driver: SCSI protocol implementation
+ *
+ * This file contains code for SCSI commands for PROCESSOR devices.
+ */
+
+#include <mach/std_types.h>
+#include <scsi/compat_30.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi2.h>
+#include <scsi/scsi_defs.h>
+
+#if (NSCSI > 0)
+
+char *sccpu_name(internal)
+ boolean_t internal;
+{
+ return internal ? "sc" : "cpu";
+}
+
+void scsi_send( tgt, ior)
+ register target_info_t *tgt;
+ io_req_t ior;
+{
+ scsi_cmd_write_t *cmd;
+ unsigned len; /* in bytes */
+ unsigned int max_dma_data;
+
+ max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
+
+ len = ior->io_count;
+ if (len > max_dma_data)
+ len = max_dma_data;
+ if (len < tgt->block_size)
+ len = tgt->block_size;
+
+ cmd = (scsi_cmd_write_t*) (tgt->cmd_ptr);
+ cmd->scsi_cmd_code = SCSI_CMD_SEND;
+ cmd->scsi_cmd_lun_and_lba1 = 0;
+ cmd->scsi_cmd_lba2 = len >> 16;
+ cmd->scsi_cmd_lba3 = len >> 8;
+ cmd->scsi_cmd_xfer_len = len;
+ cmd->scsi_cmd_ctrl_byte = 0; /* not linked */
+
+ tgt->cur_cmd = SCSI_CMD_SEND;
+
+ scsi_go(tgt, sizeof(*cmd), 0, FALSE);
+}
+
+void scsi_receive( tgt, ior)
+ register target_info_t *tgt;
+ io_req_t ior;
+{
+ scsi_cmd_read_t *cmd;
+ register unsigned len;
+ unsigned int max_dma_data;
+
+ max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
+
+ len = ior->io_count;
+ if (len > max_dma_data)
+ len = max_dma_data;
+ if (len < tgt->block_size)
+ len = tgt->block_size;
+
+ cmd = (scsi_cmd_read_t*) (tgt->cmd_ptr);
+ cmd->scsi_cmd_code = SCSI_CMD_RECEIVE;
+ cmd->scsi_cmd_lun_and_lba1 = 0;
+ cmd->scsi_cmd_lba2 = len >> 16;
+ cmd->scsi_cmd_lba3 = len >> 8;
+ cmd->scsi_cmd_xfer_len = len;
+ cmd->scsi_cmd_ctrl_byte = 0; /* not linked */
+
+ tgt->cur_cmd = SCSI_CMD_RECEIVE;
+
+ scsi_go(tgt, sizeof(*cmd), len, FALSE);
+}
+
+#endif /* NSCSI > 0 */