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diff --git a/scsi/scsi2.h b/scsi/scsi2.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: scsi2.h
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	9/90
+ *
+ *	Additions and changes of the SCSI-II standard viz SCSI-I
+ */
+
+#ifndef	_SCSI_SCSI2_H_
+#define	_SCSI_SCSI2_H_
+
+#include <scsi/scsi_endian.h>
+
+/*
+ * Single byte messages
+ *
+ * originator:	I-nitiator T-arget
+ * T-support:	M-andatory O-ptional
+ */
+
+#define SCSI_ABORT_TAG			0x0d	/* O I 2 */
+#define SCSI_CLEAR_QUEUE		0x0e	/* O I 2 */
+#define SCSI_INITIATE_RECOVERY		0x0f	/* O IT2 */
+#define SCSI_RELEASE_RECOVERY		0x10	/* O I 2 */
+#define SCSI_TERMINATE_IO_PROCESS	0x11	/* O I 2 */
+
+/*
+ * Two byte messages
+ */
+#define SCSI_SIMPLE_QUEUE_TAG		0x20	/* O IT2 */
+#define SCSI_HEADOF_QUEUE_TAG		0x21	/* O I 2 */
+#define SCSI_ORDERED_QUEUE_TAG		0x22	/* O I 2 */
+#define SCSI_IGNORE_WIDE_RESIDUE	0x23	/* O  T2 */
+					/* 0x24..0x2f reserved */
+
+/*
+ * Extended messages, codes and formats
+ */
+
+#define SCSI_WIDE_XFER_REQUEST		0x03	/* IT 2 */
+typedef struct {
+	unsigned char	xtn_msg_tag;		/* const 0x01 */
+	unsigned char	xtn_msg_len;		/* const 0x02 */
+	unsigned char	xtn_msg_code;		/* const 0x03 */
+	unsigned char	xtn_msg_xfer_width;
+} scsi_wide_xfer_t;
+
+/*
+ * NOTE: some command-specific mods and extensions
+ * are actually defined in the scsi.h file for
+ * readability reasons
+ */
+
+				/* GROUP 1 */
+
+#define	SCSI_CMD_READ_DEFECT_DATA	0x37	/* O2 disk opti */
+typedef scsi_command_group_1	scsi_cmd_read_defect_t;
+#	define SCSI_CMD_RDD_LIST_TYPE		0x07
+#	define SCSI_CMD_RDD_GLIST		0x08
+#	define SCSI_CMD_RDD_PLIST		0x10
+
+#define SCSI_CMD_WRITE_BUFFER		0x3b	/* O2 all */
+typedef scsi_command_group_1	scsi_cmd_write_buffer_t;
+#	define SCSI_CMD_BUF_MODE		0x07
+#	define scsi_cmd_buf_id			scs_cmd_lba1
+#	define scsi_cmd_buf_offset1		scs_cmd_lba2
+#	define scsi_cmd_buf_offset2		scs_cmd_lba3
+#	define scsi_cmd_buf_offset3		scs_cmd_lba4
+#	define scsi_cmd_buf_alloc1		scs_cmd_xxx
+#	define scsi_cmd_buf_alloc2		scs_cmd_xfer_len_1
+#	define scsi_cmd_buf_alloc3		scs_cmd_xfer_len_2
+
+#define SCSI_CMD_READ_BUFFER		0x3c	/* O2 all */
+#define	scsi_cmd_read_buffer_t scsi_command_group_1
+
+				/* GROUP 2 */
+
+#define SCSI_CMD_CHANGE_DEFINITION	0x40	/* O2 all */
+#define	scsi_cmd_change_def_t	scsi_command_group_2
+#	define scsi_cmd_chg_save		scsi_cmd_lba1
+#	define scsi_cmd_chg_definition		scsi_cmd_lba2
+#	define SCSI_CMD_CHG_CURRENT		0x00
+#	define SCSI_CMD_CHG_SCSI_1		0x01
+#	define SCSI_CMD_CHG_CCS			0x02
+#	define SCSI_CMD_CHG_SCSI_2		0x03
+
+					/* 0x41 reserved */
+
+#define SCSI_CMD_READ_SUBCH		0x42	/* O2 rom */
+#define	scsi_cmd_read_subch_t	scsi_command_group_2
+#	define SCSI_CMD_CD_MSF			0x02
+#	define SCSI_CMD_RS_SUBQ			0x40
+#	define scsi_cmd_rs_format	scsi_cmd_lba2
+#	define SCSI_CMD_RS_FMT_SUBQ		0x00
+#	define SCSI_CMD_RS_FMT_CURPOS		0x01
+#	define SCSI_CMD_RS_FMT_CATALOG		0x02
+#	define SCSI_CMD_RS_FMT_ISRC		0x03
+#	define scsi_cmd_rs_trackno	scsi_cmd_xxx
+
+
+#define SCSI_CMD_READ_TOC		0x43	/* O2 rom */
+#define	scsi_cmd_read_toc_t	scsi_command_group_2
+#	define scsi_cmd_rtoc_startT	scsi_cmd_xxx
+
+#define SCSI_CMD_READ_HEADER		0x44	/* O2 rom */
+#define	scsi_cmd_read_header_t	scsi_command_group_2
+
+#define SCSI_CMD_PLAY_AUDIO		0x45	/* O2 rom */
+#define	scsi_cmd_play_audio_t	scsi_command_group_2
+
+#define SCSI_CMD_PLAY_AUDIO_MSF		0x47	/* O2 rom */
+#define	scsi_cmd_play_audio_msf_t scsi_command_group_2
+#	define scsi_cmd_pamsf_startM	scsi_cmd_lba2
+#	define scsi_cmd_pamsf_startS	scsi_cmd_lba3
+#	define scsi_cmd_pamsf_startF	scsi_cmd_lba4
+#	define scsi_cmd_pamsf_endM	scsi_cmd_xxx
+#	define scsi_cmd_pamsf_endS	scsi_cmd_xfer_len_1
+#	define scsi_cmd_pamsf_endF	scsi_cmd_xfer_len_2
+
+#define SCSI_CMD_PLAY_AUDIO_TI		0x48	/* O2 rom */
+#define	scsi_cmd_play_audio_ti_t scsi_command_group_2
+#	define scsi_cmd_pati_startT	scsi_cmd_lba3
+#	define scsi_cmd_pati_startI	scsi_cmd_lba4
+#	define scsi_cmd_pati_endT	scsi_cmd_xfer_len_1
+#	define scsi_cmd_pati_endI	scsi_cmd_xfer_len_2
+
+#define SCSI_CMD_PLAY_AUDIO_TR		0x49	/* O2 rom */
+#define	scsi_cmd_play_audio_tr_t scsi_command_group_2
+#	define scsi_cmd_patr_startT	scsi_cmd_xxx
+
+
+#define SCSI_CMD_PAUSE_RESUME		0x4b	/* O2 rom */
+#define	scsi_cmd_pausres_t	scsi_command_group_2
+#	define SCSI_CMD_PAUSRES_RESUME		0x01
+#	define scsi_cmd_pausres_res	scsi_cmd_xfer_len_2
+
+#define SCSI_CMD_LOG_SELECT		0x4c	/* O2 all */
+#define	scsi_cmd_logsel_t	scsi_command_group_2
+#	define SCSI_CMD_LOG_SP			0x01
+#	define SCSI_CMD_LOG_PCR			0x02
+#	define scsi_cmd_log_page_control	scsi_cmd_lba1
+
+#define SCSI_CMD_LOG_SENSE		0x4d	/* O2 all */
+#define	scsi_cmd_logsense_t	scsi_command_group_2
+#	define SCSI_CMD_LOG_PPC			0x02
+#	define scsi_cmd_log_page_code		scsi_cmd_lba1
+#	define scsi_cmd_log_param_ptr1		scsi_cmd_lba4
+#	define scsi_cmd_log_param_ptr2		scsi_cmd_xxx
+
+
+					/* 0x4e..0x54 reserved */
+
+#define SCSI_CMD_MODE_SELECT_2		0x55	/* Z2 */
+#define	scsi_cmd_mode_select_long_t	scsi_command_group_2
+#	define SCSI_CMD_MSL2_PF		0x10
+#	define SCSI_CMD_MSL2_SP		0x01
+
+					/* 0x56..0x59 reserved */
+
+#define SCSI_CMD_MODE_SENSE_2		0x5a	/* Z2 */
+#define	scsi_cmd_mode_sense_long_t	scsi_command_group_2
+#	define SCSI_CMD_MSS2_DBD	0x08
+
+					/* 0x5b..0x5f reserved */
+
+				/* GROUP 5 */
+
+#define SCSI_CMD_PLAY_AUDIO_LONG	0xa5	/* O2 rom */
+#define	scsi_cmd_play_audio_l_t		scsi_command_group_5
+
+#define SCSI_CMD_PLAY_AUDIO_TR_LONG	0xa9	/* O2 rom */
+#define	scsi_cmd_play_audio_tr_l_t	scsi_command_group_5
+#	define scsi_cmd_patrl_startT	scsi_cmd_xxx1
+
+
+/*
+ * Command specific defines
+ */
+typedef struct {
+	BITFIELD_2(unsigned char,
+			periph_type : 5,
+			periph_qual : 3);
+#define	SCSI_SCANNER		0x06	/* periph_type values */
+#define	SCSI_MEMORY		0x07
+#define	SCSI_J_BOX		0x08
+#define	SCSI_COMM		0x09
+#define	SCSI_PREPRESS1		0x0a
+#define	SCSI_PREPRESS2		0x0b
+
+#define	SCSI_PERIPH_CONNECTED	0x00	/* periph_qual values */
+#define	SCSI_PERIPH_DISCONN	0x20
+#define	SCSI_PERIPH_NOTHERE	0x30
+
+	BITFIELD_2(unsigned char,
+			device_type : 7,
+			rmb : 1);
+
+	BITFIELD_3( unsigned char,
+			ansi : 3,
+			ecma : 3,
+			iso : 2);
+
+	BITFIELD_4( unsigned char,
+			response_fmt : 4,
+			res1 : 2,
+			trmIOP : 1,
+			aenc : 1);
+	unsigned char	length;
+	unsigned char	res2;
+	unsigned char	res3;
+
+	BITFIELD_8(unsigned char,
+			SftRe : 1,
+			CmdQue : 1,
+			res4 : 1,
+			Linked : 1,
+			Sync : 1,
+			Wbus16 : 1,
+			Wbus32 : 1,
+			RelAdr : 1);
+
+	unsigned char	vendor_id[8];
+	unsigned char	product_id[16];
+	unsigned char	product_rev[4];
+	unsigned char	vendor_uqe[20];
+	unsigned char	reserved[40];
+	unsigned char	vendor_uqe1[1];	/* varsize */
+} scsi2_inquiry_data_t;
+#define	SCSI_INQ_SUPP_PAGES	0x00
+#define	SCSI_INQ_A_INFO		0x01	/* 0x01..0x1f, really */
+#define	SCSI_INQ_SERIALNO	0x80
+#define	SCSI_INQ_IMPL_OPDEF	0x81
+#define	SCSI_INQ_A_IMPL_OPDEF	0x82
+
+/* mode_select */
+typedef struct {
+	unsigned char	data_len;
+	unsigned char	medium_type;
+	unsigned char	device_specific;
+	unsigned char	desc_len;
+	/* block descriptors are optional, same struct as scsi1 */
+	/* page info then follows, see individual pages */
+} scsi2_mode_param_t;
+
+/*
+ * CDROM thingies
+ */
+typedef union {
+	struct {
+		unsigned char	xxx;
+		unsigned char	minute;
+		unsigned char	second;
+		unsigned char	frame;
+	} msf;
+	struct {
+		unsigned char	lba1;
+		unsigned char	lba2;
+		unsigned char	lba3;
+		unsigned char	lba4;
+	} lba;
+} cdrom_addr_t;
+
+typedef struct {
+	unsigned char	len1;		/* MSB */
+	unsigned char	len2;		/* LSB */
+	unsigned char	first_track;
+	unsigned char	last_track;
+	struct cdrom_toc_desc {
+
+		unsigned char	xxx;
+
+		BITFIELD_2(unsigned char,
+			control : 4,
+			adr : 4);
+
+		unsigned char	trackno;
+		unsigned char	xxx1;
+		cdrom_addr_t	absolute_address;
+	} descs[1];			/* varsize */
+} cdrom_toc_t;
+
+typedef struct {
+	unsigned char	xxx;
+
+	unsigned char	audio_status;
+#define SCSI_CDST_INVALID	0x00
+#define SCSI_CDST_PLAYING	0x11
+#define SCSI_CDST_PAUSED	0x12
+#define SCSI_CDST_COMPLETED	0x13
+#define SCSI_CDST_ERROR		0x14
+#define SCSI_CDST_NO_STATUS	0x15
+
+	unsigned char	len1;
+	unsigned char	len2;
+	struct cdrom_chanQ {
+		unsigned char	format;
+		BITFIELD_2(unsigned char,
+			control : 4,
+			adr : 4);
+		unsigned char	trackno;
+		unsigned char	indexno;
+		cdrom_addr_t	absolute_address;
+		cdrom_addr_t	relative_address;
+		BITFIELD_2(unsigned char,
+			xxx : 7,
+			mcv : 1);
+		unsigned char	catalog[15];
+		BITFIELD_2(unsigned char,
+			xxx1 : 7,
+			tcv  : 1);
+		unsigned char	isrc[15];
+	} subQ;
+} cdrom_chan_data_t;
+
+/* subsets */
+typedef struct {
+	unsigned char	xxx;
+	unsigned char	audio_status;
+	unsigned char	len1;
+	unsigned char	len2;
+	struct {
+		unsigned char	format;
+		BITFIELD_2(unsigned char,
+			control : 4,
+			adr : 4);
+		unsigned char	trackno;
+		unsigned char	indexno;
+		cdrom_addr_t	absolute_address;
+		cdrom_addr_t	relative_address;
+	} subQ;
+} cdrom_chan_curpos_t;
+
+typedef struct {
+	unsigned char	xxx;
+	unsigned char	audio_status;
+	unsigned char	len1;
+	unsigned char	len2;
+	struct {
+		unsigned char	format;
+		unsigned char	xxx1[3];
+		BITFIELD_2(unsigned char,
+			xxx : 7,
+			mcv : 1);
+		unsigned char	catalog[15];
+	} subQ;
+} cdrom_chan_catalog_t;
+
+typedef struct {
+	unsigned char	xxx;
+	unsigned char	audio_status;
+	unsigned char	len1;
+	unsigned char	len2;
+	struct {
+		unsigned char	format;
+		BITFIELD_2(unsigned char,
+			control : 4,
+			adr : 4);
+		unsigned char	trackno;
+		unsigned char	xxx0;
+		BITFIELD_2(unsigned char,
+			xxx1 : 7,
+			tcv  : 1);
+		unsigned char	isrc[15];
+	} subQ;
+} cdrom_chan_isrc_t;
+
+/* Audio page */
+typedef struct {
+	scsi_mode_sense_data_t	h;	/* includes bdescs */
+	unsigned char	page_code;
+#define	SCSI_CD_AUDIO_PAGE	0x0e
+	unsigned char	page_len;
+	BITFIELD_4(unsigned char,
+		xxx1 : 1,
+		sotc : 1,
+		imm  : 1,
+		xxx2 : 5);
+	unsigned char	xxx3[2];
+	BITFIELD_3(unsigned char,
+		fmt : 4,
+		xxx4 : 3,
+		aprv : 1);
+	unsigned char	bps1;
+	unsigned char	bps2;
+	BITFIELD_2(unsigned char,
+		sel0 : 4,
+		xxx5 : 4);
+	unsigned char	vol0;
+	BITFIELD_2(unsigned char,
+		sel1 : 4,
+		xxx6 : 4);
+	unsigned char	vol1;
+	BITFIELD_2(unsigned char,
+		sel2 : 4,
+		xxx7 : 4);
+	unsigned char	vol2;
+	BITFIELD_2(unsigned char,
+		sel3 : 4,
+		xxx8 : 4);
+	unsigned char	vol3;
+} cdrom_audio_page_t;
+
+/*
+ * Status byte (a-la scsi2)
+ */
+
+typedef union {
+    struct {
+	BITFIELD_3( unsigned char,
+			scsi_status_reserved1:1,
+			scsi_status_code:5,
+			scsi_status_reserved2:2);
+							/* more scsi_status_code values */
+					/* 00..0c as in SCSI-I */
+#	define SCSI_ST2_CMD_TERMINATED	0x11	/* 2 */
+#	define SCSI_ST2_QUEUE_FULL	0x14	/* 2 */
+					/* anything else is reserved */
+    } st;
+    unsigned char bits;
+} scsi2_status_byte_t;
+
+#endif	_SCSI_SCSI2_H_