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diff --git a/scsi/scsi.h b/scsi/scsi.h
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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.h
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	9/90
+ *
+ *	Definitions of the SCSI-1 Standard
+ */
+
+#ifndef	_SCSI_SCSI_H_
+#define	_SCSI_SCSI_H_
+
+#include <nscsi.h>
+#include <scsi/scsi_endian.h>
+
+/*
+ * Bus phases
+ */
+
+#define	SCSI_IO		0x01		/* Input/Output */
+#define	SCSI_CD		0x02		/* Command/Data */
+#define	SCSI_MSG	0x04		/* Message */
+
+#define	SCSI_PHASE_MASK	0x07
+#define	SCSI_PHASE(x)	((x)&SCSI_PHASE_MASK)
+
+#define	SCSI_PHASE_DATAO	0x00				/* 0 */
+#define	SCSI_PHASE_DATAI	SCSI_IO				/* 1 */
+#define	SCSI_PHASE_CMD		SCSI_CD				/* 2 */
+#define	SCSI_PHASE_STATUS	(SCSI_CD|SCSI_IO)		/* 3 */
+								/* 4..5 ANSI reserved */
+#define	SCSI_PHASE_MSG_OUT	(SCSI_MSG|SCSI_CD)		/* 6 */
+#define	SCSI_PHASE_MSG_IN	(SCSI_MSG|SCSI_CD|SCSI_IO)	/* 7 */
+
+/*
+ * Single byte messages
+ *
+ * originator:	I-nitiator T-arget
+ * T-support:	M-andatory O-ptional
+ */
+
+#define SCSI_COMMAND_COMPLETE		0x00	/* M T   */
+#define SCSI_EXTENDED_MESSAGE		0x01	/*   IT  */
+#define SCSI_SAVE_DATA_POINTER		0x02	/* O T   */
+#define SCSI_RESTORE_POINTERS		0x03	/* O T   */
+#define SCSI_DISCONNECT			0x04	/* O T   */
+#define SCSI_I_DETECTED_ERROR		0x05	/* M I   */
+#define SCSI_ABORT			0x06	/* M I   */
+#define SCSI_MESSAGE_REJECT		0x07	/* M IT  */
+#define SCSI_NOP			0x08	/* M I   */
+#define SCSI_MSG_PARITY_ERROR		0x09	/* M I   */
+#define SCSI_LNKD_CMD_COMPLETE		0x0a	/* O T   */
+#define SCSI_LNKD_CMD_COMPLETE_F	0x0b	/* O T   */
+#define SCSI_BUS_DEVICE_RESET		0x0c	/* M I   */
+					/* 0x0d..0x11 scsi2 */
+					/* 0x12..0x1f reserved */
+#define SCSI_IDENTIFY			0x80	/* IT */
+#	define SCSI_IFY_ENABLE_DISCONNECT	0x40	/* I  */
+#	define SCSI_IFY_LUNTAR			0x20	/* IT */
+#	define SCSI_IFY_LUN_MASK		0x07	/* IT */
+
+
+/* Message codes 0x30..0x7f are reserved */
+
+/*
+ * Extended messages, codes and formats
+ */
+
+#define SCSI_MODIFY_DATA_PTR		0x00	/* T  */
+typedef struct {
+	unsigned char	xtn_msg_tag;		/* const 0x01 */
+	unsigned char	xtn_msg_len;		/* const 0x05 */
+	unsigned char	xtn_msg_code;		/* const 0x00 */
+	unsigned char	xtn_msg_arg_1000;	/* MSB, signed 2cmpl */
+	unsigned char	xtn_msg_arg_0200;
+	unsigned char	xtn_msg_arg_0030;
+	unsigned char	xtn_msg_arg_0004;	/* LSB */
+} scsi_mod_ptr_t;
+
+#define SCSI_SYNC_XFER_REQUEST		0x01	/* IT */
+typedef struct {
+	unsigned char	xtn_msg_tag;		/* const 0x01 */
+	unsigned char	xtn_msg_len;		/* const 0x03 */
+	unsigned char	xtn_msg_code;		/* const 0x01 */
+	unsigned char	xtn_msg_xfer_period;	/* times 4nsecs */
+	unsigned char	xtn_msg_xfer_offset;	/* pending ack window */
+#define SCSI_SYNCH_XFER_OFFANY	0xff		/* T  unlimited */
+} scsi_synch_xfer_req_t;
+
+#define SCSI_XTN_IDENTIFY		0x02	/* IT -2 */
+typedef struct {
+	unsigned char	xtn_msg_tag;		/* const 0x01 */
+	unsigned char	xtn_msg_len;		/* const 0x02 */
+	unsigned char	xtn_msg_code;		/* const 0x02 */
+	unsigned char	xtn_msg_sublun;
+} scsi_xtn_identify_t;
+
+					/* 0x03..0x7f reserved */
+
+#define SCSI_XTN_VENDOR_UQE		0x80	/* vendor unique bit */
+typedef struct {
+	unsigned char	xtn_msg_tag;		/* const 0x01 */
+	unsigned char	xtn_msg_len;		/* args' len+1 (0-->256)*/
+	unsigned char	xtn_msg_code;		/* const 0x80..0xff */
+	unsigned char	xtn_msg_args[1];	/* 0..255 bytes */
+} scsi_xtn_vedor_unique_t;
+
+
+/*
+ * Commands, generic structures
+ */
+
+/* SIX byte commands */
+typedef struct {
+	unsigned char	scsi_cmd_code;		/* group(7..5) and command(4..1) */
+#define SCSI_CODE_GROUP		0xe0
+#define SCSI_CODE_CMD		0x1f
+	unsigned char	scsi_cmd_lun_and_lba1;	/* lun(7..5) and block# msb[20..16] */
+#define SCSI_LUN_MASK		0xe0
+#define SCSI_LBA_MASK		0x1f
+#define	SCSI_LUN_SHIFT		5
+	unsigned char	scsi_cmd_lba2;		/* block#[15.. 8] */
+	unsigned char	scsi_cmd_lba3;		/* block#[ 7.. 0] */
+	unsigned char	scsi_cmd_xfer_len;	/* if required */
+	unsigned char	scsi_cmd_ctrl_byte;	/* contains: */
+#define	SCSI_CTRL_VUQ		0xc0		/* vendor unique bits */
+#define SCSI_CTRL_RESVD		0x3c		/* reserved, mbz */
+#define SCSI_CTRL_FLAG		0x02		/* send a complete_with_flag at end */
+#define SCSI_CTRL_LINK		0x01		/* link this command with next */
+} scsi_command_group_0;
+
+/* TEN byte commands */
+typedef struct {
+	unsigned char	scsi_cmd_code;		/* group(7..5) and command(4..1) */
+	unsigned char	scsi_cmd_lun_and_relbit;/* lun(7..5) and RelAdr(0) */
+#define SCSI_RELADR		0x01
+	unsigned char	scsi_cmd_lba1;		/* block#[31..24] */
+	unsigned char	scsi_cmd_lba2;		/* block#[23..16] */
+	unsigned char	scsi_cmd_lba3;		/* block#[15.. 8] */
+	unsigned char	scsi_cmd_lba4;		/* block#[ 7.. 0] */
+	unsigned char	scsi_cmd_xxx;		/* reserved, mbz */
+	unsigned char	scsi_cmd_xfer_len_1;	/* if required */
+	unsigned char	scsi_cmd_xfer_len_2;	/* if required */
+	unsigned char	scsi_cmd_ctrl_byte;	/* see above */
+} scsi_command_group_1,
+  scsi_command_group_2;
+
+/* TWELVE byte commands */
+typedef struct {
+	unsigned char	scsi_cmd_code;		/* group(7..5) and command(4..1) */
+	unsigned char	scsi_cmd_lun_and_relbit;/* lun(7..5) and RelAdr(0) */
+	unsigned char	scsi_cmd_lba1;		/* block#[31..24] */
+	unsigned char	scsi_cmd_lba2;		/* block#[23..16] */
+	unsigned char	scsi_cmd_lba3;		/* block#[15.. 8] */
+	unsigned char	scsi_cmd_lba4;		/* block#[ 7.. 0] */
+	unsigned char	scsi_cmd_xfer_len_1;	/* if required */
+	unsigned char	scsi_cmd_xfer_len_2;	/* if required */
+	unsigned char	scsi_cmd_xfer_len_3;	/* if required */
+	unsigned char	scsi_cmd_xfer_len_4;	/* if required */
+	unsigned char	scsi_cmd_xxx1;		/* reserved, mbz */
+	unsigned char	scsi_cmd_ctrl_byte;	/* see above */
+} scsi_command_group_5;
+
+
+/*
+ * Commands, codes and aliases
+ */
+
+				/* GROUP 0 */
+#define SCSI_CMD_TEST_UNIT_READY	0x00	/* O all 2M all */
+#define	scsi_cmd_test_unit_ready_t	scsi_command_group_0
+
+#define SCSI_CMD_REZERO_UNIT		0x01	/* O disk worm rom */
+#define SCSI_CMD_REWIND			0x01	/* M tape */
+#define	scsi_cmd_rewind_t	scsi_command_group_0
+#define	scsi_cmd_rezero_t	scsi_command_group_0
+#	define SCSI_CMD_REW_IMMED		0x01
+
+					/* 0x02 vendor unique */
+
+#define SCSI_CMD_REQUEST_SENSE		0x03	/* M all */
+#define	scsi_cmd_request_sense_t	scsi_command_group_0
+#	define scsi_cmd_allocation_length	scsi_cmd_xfer_len
+
+#define SCSI_CMD_FORMAT_UNIT		0x04	/* M disk O prin */
+#define	scsi_cmd_format_t	scsi_command_group_0
+#	define SCSI_CMD_FMT_FMTDATA		0x10
+#	define SCSI_CMD_FMT_CMPLIST		0x08
+#	define SCSI_CMD_FMT_LIST_TYPE		0x07
+#	define scsi_cmd_intleave1		scsi_cmd_lba3
+#	define scsi_cmd_intleave2		scsi_cmd_xfer_len
+
+#define SCSI_CMD_READ_BLOCK_LIMITS	0x05	/* E tape */
+#define	scsi_cmd_block_limits_t	scsi_command_group_0
+
+					/* 0x06 vendor unique */
+
+#define SCSI_CMD_REASSIGN_BLOCKS	0x07	/* O disk worm */
+#define	scsi_cmd_reassign_blocks_t	scsi_command_group_0
+
+#define SCSI_CMD_READ			0x08	/* M disk tape O worm rom */
+#define	SCSI_CMD_RECEIVE		0x08	/* O proc */
+#define	SCSI_CMD_GET_MESSAGE		0x08	/* M comm */
+#define	scsi_cmd_read_t	scsi_command_group_0
+#	define SCSI_CMD_TP_FIXED		0x01		/* tape */
+#	define scsi_cmd_tp_len1			scsi_cmd_lba2
+#	define scsi_cmd_tp_len2			scsi_cmd_lba3
+#	define scsi_cmd_tp_len3			scsi_cmd_xfer_len
+					/* largest addressable blockno */
+#define	SCSI_CMD_READ_MAX_LBA		((1 << 21) - 1)
+
+					/* 0x09 vendor unique */
+
+#define SCSI_CMD_WRITE			0x0a	/* M disk tape O worm */
+#define SCSI_CMD_PRINT			0x0a	/* M prin */
+#define SCSI_CMD_SEND			0x0a	/* M proc */
+#define SCSI_CMD_SEND_MESSAGE		0x0a	/* M comm */
+#define	scsi_cmd_write_t	scsi_command_group_0
+
+#define SCSI_CMD_SEEK			0x0b	/* O disk worm rom */
+#define SCSI_CMD_TRACK_SELECT		0x0b	/* O tape */
+#define SCSI_CMD_SLEW_AND_PRINT		0x0b	/* O prin */
+#define	scsi_cmd_seek_t	scsi_command_group_0
+#	define SCSI_CMD_SLW_CHANNEL		0x01
+#	define scsi_cmd_tp_trackno		scsi_cmd_xfer_len
+#	define scsi_cmd_slew_value		scsi_cmd_lba2
+
+					/* 0x0c..0x0e vendor unique */
+
+#define SCSI_CMD_READ_REVERSE		0x0f	/* O tape */
+#define	scsi_cmd_rev_read_t	scsi_command_group_0
+
+#define SCSI_CMD_WRITE_FILEMARKS	0x10	/* M tape */
+#define SCSI_CMD_FLUSH_BUFFER		0x10	/* M prin */
+#define	scsi_cmd_write_fil_t	scsi_command_group_0
+
+#define SCSI_CMD_SPACE			0x11	/* O tape */
+#define	scsi_cmd_space_t	scsi_command_group_0
+#	define SCSI_CMD_SP_BLOCKS		0x00
+#	define SCSI_CMD_SP_FIL			0x01
+#	define SCSI_CMD_SP_SEQ_FIL		0x02
+#	define SCSI_CMD_SP_EOT			0x03
+
+#define SCSI_CMD_INQUIRY		0x12	/* E all (2M all) */
+#define	scsi_cmd_inquiry_t	scsi_command_group_0
+#	define SCSI_CMD_INQ_EVPD		0x01	/* 2 */
+#	define scsi_cmd_page_code		scsi_cmd_lba2	/* 2 */
+
+#define SCSI_CMD_VERIFY_0		0x13	/* O tape */
+#define	scsi_cmd_verify_t	scsi_command_group_0
+#	define SCSI_CMD_VFY_BYTCMP		0x02
+
+#define SCSI_CMD_RECOVER_BUFFERED_DATA	0x14	/* O tape prin */
+#define	scsi_cmd_recover_buffer_t	scsi_command_group_0
+
+#define SCSI_CMD_MODE_SELECT		0x15	/* O disk tape prin worm rom */
+#	define SCSI_CMD_MSL_PF			0x10
+#	define SCSI_CMD_MSL_SP			0x01
+#define	scsi_cmd_mode_select_t	scsi_command_group_0
+
+#define SCSI_CMD_RESERVE		0x16	/* O disk tape prin worm rom */
+#define	scsi_cmd_reserve_t	scsi_command_group_0
+#	define SCSI_CMD_RES_3RDPTY		0x10
+#	define SCSI_CMD_RES_3RDPTY_DEV		0x0e
+#	define SCSI_CMD_RES_EXTENT		0x01
+#	define scsi_cmd_reserve_id		scsi_cmd_lba2
+#	define scsi_cmd_extent_llen1		scsi_cmd_lba3
+#	define scsi_cmd_extent_llen2		scsi_cmd_xfer_len
+
+#define SCSI_CMD_RELEASE		0x17	/* O disk tape prin worm rom */
+#define	scsi_cmd_release_t	scsi_command_group_0
+
+#define SCSI_CMD_COPY			0x18	/* O all */
+#define	scsi_cmd_copy_t	scsi_command_group_0
+#	define SCSI_CMD_CPY_PAD			0x01	/* 2 */
+#	define scsi_cmd_paraml_len0		scsi_cmd_lba2
+#	define scsi_cmd_paraml_len1		scsi_cmd_lba3
+#	define scsi_cmd_paraml_len2		scsi_cmd_xfer_len
+
+#define SCSI_CMD_ERASE			0x19	/* O tape */
+#define	scsi_cmd_erase_t	scsi_command_group_0
+#	define SCSI_CMD_ER_LONG			0x01
+
+#define SCSI_CMD_MODE_SENSE		0x1a	/* O disk tape prin worm rom */
+#define	scsi_cmd_mode_sense_t	scsi_command_group_0
+#	define scsi_cmd_ms_pagecode		scsi_cmd_lba2
+
+#define SCSI_CMD_START_STOP_UNIT	0x1b	/* O disk prin worm rom */
+#define SCSI_CMD_LOAD_UNLOAD		0x1b	/* O tape */
+#define	scsi_cmd_start_t	scsi_command_group_0
+#	define SCSI_CMD_SS_IMMED		0x01
+#	define scsi_cmd_ss_flags		scsi_cmd_xfer_len
+#	define SCSI_CMD_SS_START		0x01
+#	define SCSI_CMD_SS_RETEN		0x02
+#	define SCSI_CMD_SS_RETAIN		0x01
+#	define SCSI_CMD_SS_EJECT		0x02
+
+#define SCSI_CMD_RECEIVE_DIAG_RESULTS	0x1c	/* O all */
+#define	scsi_cmd_receive_diag_t	scsi_command_group_0
+#	define scsi_cmd_allocation_length1	scsi_cmd_lba3
+#	define scsi_cmd_allocation_length2	scsi_cmd_xfer_len
+
+#define SCSI_CMD_SEND_DIAGNOSTICS	0x1d	/* O all */
+#define	scsi_cmd_send_diag_t	scsi_command_group_0
+#	define SCSI_CMD_DIAG_SELFTEST		0x04
+#	define SCSI_CMD_DIAG_DEVOFFL		0x02
+#	define SCSI_CMD_DIAG_UNITOFFL		0x01
+
+#define SCSI_CMD_PREVENT_ALLOW_REMOVAL	0x1e	/* O disk tape worm rom */
+#define	scsi_cmd_medium_removal_t	scsi_command_group_0
+#	define scsi_cmd_pa_prevent		scsi_cmd_xfer_len /* 0x1 */
+
+					/* 0x1f reserved */
+
+				/* GROUP 1 */
+					/* 0x20..0x24 vendor unique */
+
+#define SCSI_CMD_READ_CAPACITY		0x25	/* E disk worm rom */
+#define	scsi_cmd_read_capacity_t	scsi_command_group_1
+#	define scsi_cmd_rcap_flags		scsi_cmd_xfer_len_2
+#	define SCSI_CMD_RCAP_PMI		0x01
+
+					/* 0x26..0x27 vendor unique */
+
+#define SCSI_CMD_LONG_READ			0x28	/* E disk M worm rom */
+#define	scsi_cmd_long_read_t	scsi_command_group_1
+
+					/* 0x29 vendor unique */
+
+#define SCSI_CMD_LONG_WRITE			0x2a	/* E disk M worm */
+#define	scsi_cmd_long_write_t	scsi_command_group_1
+
+#define SCSI_CMD_LONG_SEEK			0x2b	/* O disk worm rom */
+#define	scsi_cmd_long_seek_t	scsi_command_group_1
+
+					/* 0x2c..0x2d vendor unique */
+
+#define SCSI_CMD_WRITE_AND_VERIFY	0x2e	/* O disk worm */
+#define	scsi_cmd_write_vfy_t	scsi_command_group_1
+#	define SCSI_CMD_VFY_BYTCHK		0x02
+
+#define SCSI_CMD_VERIFY_1		0x2f	/* O disk worm rom */
+#define	scsi_cmd_verify_long_t	scsi_command_group_1
+#	define SCSI_CMD_VFY_BLKVFY		0x04
+
+#define SCSI_CMD_SEARCH_HIGH		0x30	/* O disk worm rom */
+#define	scsi_cmd_search_t	scsi_command_group_1
+#	define SCSI_CMD_SRCH_INVERT		0x10
+#	define SCSI_CMD_SRCH_SPNDAT		0x02
+
+#define SCSI_CMD_SEARCH_EQUAL		0x31	/* O disk worm rom */
+#define SCSI_CMD_SEARCH_LOW		0x32	/* O disk worm rom */
+
+#define SCSI_CMD_SET_LIMITS		0x33	/* O disk worm rom */
+#define	scsi_cmd_set_limits_t	scsi_command_group_1
+#	define SCSI_CMD_SL_RDINH		0x02
+#	define SCSI_CMD_SL_WRINH		0x01
+
+					/* 0x34..0x38 reserved */
+
+#define SCSI_CMD_COMPARE		0x39	/* O all */
+#define	scsi_cmd_compare_t	scsi_command_group_1
+#	define scsi_cmd_1_paraml1		scsi_cmd_lba2
+#	define scsi_cmd_1_paraml2		scsi_cmd_lba3
+#	define scsi_cmd_1_paraml3		scsi_cmd_lba4
+
+#define SCSI_CMD_COPY_AND_VERIFY	0x3a	/* O all */
+#define	scsi_cmd_copy_vfy_t	scsi_command_group_1
+#	define SCSI_CMD_CPY_BYTCHK		0x02
+
+					/* 0x3b..0x3f reserved */
+
+				/* GROUP 2 */
+					/* 0x40..0x5f reserved */
+
+				/* GROUP 3 */
+					/* 0x60..0x7f reserved */
+
+				/* GROUP 4 */
+					/* 0x80..0x9f reserved */
+
+				/* GROUP 5 */
+					/* 0xa0..0xaf vendor unique */
+					/* 0xb0..0xbf reserved */
+
+				/* GROUP 6 */
+					/* 0xc0..0xdf vendor unique */
+
+				/* GROUP 7 */
+					/* 0xe0..0xff vendor unique */
+
+
+/*
+ * Command-specific results and definitions
+ */
+
+/* inquiry data */
+typedef struct {
+	unsigned char	periph_type;
+#define	SCSI_DISK	0x00
+#define SCSI_TAPE	0x01
+#define	SCSI_PRINTER	0x02
+#define	SCSI_CPU	0x03
+#define	SCSI_WORM	0x04
+#define	SCSI_CDROM	0x05
+
+	BITFIELD_2( unsigned char,
+			device_type : 7,
+			rmb : 1);
+	BITFIELD_3( unsigned char,
+			ansi : 3,
+			ecma : 3,
+			iso : 2);
+	unsigned char	reserved;
+	unsigned char	length;
+	unsigned char	param[1];
+} scsi_inquiry_data_t;
+
+#define	SCSI_INQ_STD_DATA	-1
+
+/* request sense data */
+#define SCSI_SNS_NOSENSE	0x0
+#define SCSI_SNS_RECOVERED	0x1
+#define SCSI_SNS_NOTREADY	0x2
+#define SCSI_SNS_MEDIUM_ERR	0x3
+#define SCSI_SNS_HW_ERR		0x4
+#define SCSI_SNS_ILLEGAL_REQ	0x5
+#define SCSI_SNS_UNIT_ATN	0x6
+#define SCSI_SNS_PROTECT	0x7
+#define	SCSI_SNS_BLANK_CHK	0x8
+#define	SCSI_SNS_VUQE		0x9
+#define	SCSI_SNS_COPY_ABRT	0xa
+#define	SCSI_SNS_ABORTED	0xb
+#define	SCSI_SNS_EQUAL		0xc
+#define	SCSI_SNS_VOLUME_OVFL	0xd
+#define	SCSI_SNS_MISCOMPARE	0xe
+#define	SCSI_SNS_RESERVED	0xf
+
+typedef struct {
+	BITFIELD_3( unsigned char,
+		error_code : 4,
+		error_class : 3,
+		addr_valid : 1);
+#	define	SCSI_SNS_XTENDED_SENSE_DATA	0x7	/* e.g. error_class=7 */
+	union {
+	    struct {
+		BITFIELD_2(unsigned char,
+			lba_msb : 5,
+			vuqe : 3);
+		unsigned char	lba;
+		unsigned char	lba_lsb;
+	    } non_xtnded;
+	    struct {
+		unsigned char	segment_number;
+		BITFIELD_5(unsigned char,
+			sense_key : 4,
+			res : 1,
+			ili : 1,
+			eom : 1,
+			fm : 1);
+		unsigned char	info0;
+		unsigned char	info1;
+		unsigned char	info2;
+		unsigned char	info3;
+		unsigned char	add_len;
+		unsigned char	add_bytes[1];/* VARSIZE */
+	    } xtended;
+	} u;
+} scsi_sense_data_t;
+
+
+/* mode select params */
+typedef struct {
+	unsigned char	reserved1;
+	unsigned char	medium_type;
+	BITFIELD_3(unsigned char,
+			speed:4,	/* special for tapes, reserved in SCSI-1 */
+			buffer_mode:3,
+			reserved2:1);
+	unsigned char	desc_len;
+	struct scsi_mode_parm_blockdesc {
+		unsigned char	density_code;
+		unsigned char	nblocks1;
+		unsigned char	nblocks2;
+		unsigned char	nblocks3;
+		unsigned char	reserved;
+		unsigned char	reclen1;
+		unsigned char	reclen2;
+		unsigned char	reclen3;
+	} descs[1];		/* VARSIZE, really */
+} scsi_mode_select_param_t;
+
+/* mode sense data (TAPE) */
+typedef struct {
+	unsigned char	data_len;
+	unsigned char	medium_type;
+	BITFIELD_3(unsigned char,
+			speed : 4,
+			buffered_mode : 3,
+			wp : 1);
+	unsigned char	bdesc_len;
+	struct {
+	    unsigned char	density_code;
+	    unsigned char	no_blks_msb;
+	    unsigned char	no_blks;
+	    unsigned char	no_blks_lsb;
+	    unsigned char	reserved;
+	    unsigned char	blen_msb;
+	    unsigned char	blen;
+	    unsigned char	blen_lsb;
+	} bdesc[1];	/* VARSIZE */
+	/* vuqe data might follow */
+} scsi_mode_sense_data_t;
+
+/* read capacity data */
+typedef struct {
+	unsigned char	lba1;
+	unsigned char	lba2;
+	unsigned char	lba3;
+	unsigned char	lba4;
+	unsigned char	blen1;
+	unsigned char	blen2;
+	unsigned char	blen3;
+	unsigned char	blen4;
+} scsi_rcap_data_t;
+
+/* defect list(s) */
+typedef struct {
+	unsigned char	res1;
+	unsigned char	res2;
+	unsigned char	list_len_msb;
+	unsigned char	list_len_lsb;
+	struct {
+	    unsigned char	blockno_msb;
+	    unsigned char	blockno_sb1;
+	    unsigned char	blockno_sb2;
+	    unsigned char	blockno_lsb;
+	} defects[1];	/* VARSIZE */
+} scsi_Ldefect_data_t;
+
+/* block limits (tape) */
+typedef struct {
+	unsigned char	res1;
+	unsigned char	maxlen_msb;
+	unsigned char	maxlen_sb;
+	unsigned char	maxlen_lsb;
+	unsigned char	minlen_msb;
+	unsigned char	minlen_lsb;
+} scsi_blimits_data_t;
+
+/*
+ * Status byte (a-la scsi1)
+ */
+
+typedef union {
+    struct {
+	BITFIELD_4( unsigned char,
+			scsi_status_vendor_uqe1:1,
+			scsi_status_code:4,
+			scsi_status_vendor_uqe:2,
+			scsi_status_reserved:1);
+#	define SCSI_ST_GOOD		0x00		/* scsi_status_code values */
+#	define SCSI_ST_CHECK_CONDITION	0x01
+#	define SCSI_ST_CONDITION_MET	0x02
+#	define SCSI_ST_BUSY		0x04
+#	define SCSI_ST_INT_GOOD		0x08
+#	define SCSI_ST_INT_MET		0x0a
+#	define SCSI_ST_RES_CONFLICT	0x0c
+					/* anything else is reserved */
+    } st;
+    unsigned char bits;
+} scsi_status_byte_t;
+
+
+#endif	_SCSI_SCSI_H_