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Diffstat (limited to 'scsi/scsi_cpu.c')
| -rw-r--r-- | scsi/scsi_cpu.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/scsi/scsi_cpu.c b/scsi/scsi_cpu.c new file mode 100644 index 0000000..979847c --- /dev/null +++ b/scsi/scsi_cpu.c @@ -0,0 +1,109 @@ +/* + * 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 */ |