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diff --git a/scsi/adapters/scsi_aha15.h b/scsi/adapters/scsi_aha15.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_aha15.h
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	6/91
+ *
+ *	Definitions for the Adaptec AHA-15xx family
+ *	of Intelligent SCSI Host Adapter boards
+ */
+
+#ifndef	_SCSI_AHA15_H_
+#define	_SCSI_AHA15_H_
+
+/*
+ * Addresses/length in 24 bits
+ *
+ * BEWARE: your compiler must pack these correctly,
+ * e.g. without gaps between two such contiguous structs
+ * (GCC does)
+ */
+typedef struct {
+	unsigned char	msb;
+	unsigned char	mid;
+	unsigned char	lsb;
+} aha_address_t;
+
+#define AHA_ADDRESS_SET(addr,val)	{\
+		(addr).msb = ((val) >> 16);\
+		(addr).mid = ((val) >>  8);\
+		(addr).lsb =  (val)	  ;\
+	}
+#define AHA_ADDRESS_GET(addr,val) {\
+		(val) = ((addr).msb << 16) |\
+			((addr).mid <<  8) |\
+			((addr).lsb      ) ;\
+	}
+
+#define	aha_length_t	aha_address_t
+#define	AHA_LENGTH_SET	AHA_ADDRESS_SET
+#define	AHA_LENGTH_GET	AHA_ADDRESS_GET
+
+/*
+ * Register map
+ */
+
+typedef struct {
+	volatile unsigned char	aha_status;	/* r:  Status Register */
+#define			aha_ctl aha_status	/* w:  Control Register */
+
+	volatile unsigned char	aha_data;	/* rw: Data Port */
+#define			aha_cmd aha_data	/* w:  Command register */
+
+	volatile unsigned char	aha_intr;	/* ro: Interrupt Register */
+} aha_regmap_t;
+
+/* ..but on the 386 I/O is not memory mapped */
+#define	AHA_STATUS_PORT(port)	((port))
+#define	AHA_CONTROL_PORT(port)	((port))
+#define	AHA_COMMAND_PORT(port)	((port)+1)
+#define	AHA_DATA_PORT(port)	((port)+1)
+#define	AHA_INTR_PORT(port)	((port)+2)
+
+/* Status Register */
+#define AHA_CSR_CMD_ERR		0x01		/* Invalid command */
+#define AHA_CSR_xxx		0x02		/* undefined */
+#define AHA_CSR_DATAI_FULL	0x04		/* In-port full */
+#define AHA_CSR_DATAO_FULL	0x08		/* Out-port full */
+#define AHA_CSR_IDLE		0x10		/* doin nuthin */
+#define AHA_CSR_INIT_REQ	0x20		/* initialization required */
+#define AHA_CSR_DIAG_FAIL	0x40		/* selftest failed */
+#define AHA_CSR_SELF_TEST	0x80		/* selftesting */
+
+/* Control Register */
+#define AHA_CTL_xxx		0x0f		/* undefined */
+#define AHA_CTL_SCSI_RST	0x10		/* reset SCSIbus */
+#define AHA_CTL_INTR_CLR	0x20		/* Clear interrupt reg */
+#define AHA_CTL_SOFT_RESET	0x40		/* Board only, no selftest */
+#define AHA_CTL_HARD_RESET	0x80		/* Full reset, and SCSIbus */
+
+/* Interrupt Flags register */
+#define AHA_INTR_MBI_FULL	0x01		/* scan the In mboxes */
+#define AHA_INTR_MBO_AVAIL	0x02		/* scan the Out mboxes */
+#define AHA_INTR_DONE		0x04		/* command complete */
+#define AHA_INTR_RST		0x08		/* saw a SCSIbus reset */
+#define AHA_INTR_xxx		0x70		/* undefined */
+#define AHA_INTR_PENDING	0x80		/* Any interrupt bit set */
+
+/*
+ * Command register
+ */
+#define AHA_CMD_NOP		0x00		/* */
+#define AHA_CMD_INIT		0x01		/* mbox initialization */
+	/* 4 bytes follow: # of Out mboxes (x2->total), and
+			   msb, mid, lsb of mbox address */
+struct aha_init {
+	unsigned char		mb_count;
+	aha_address_t		mb_ptr;
+};
+#define AHA_CMD_START		0x02		/* start SCSI cmd */
+#define AHA_CMD_BIOS		0x03		
+#define AHA_CMD_INQUIRY		0x04
+	/* returns 4 bytes: */
+struct aha_inq {
+	unsigned char		board_id;
+#	define	AHA_BID_1540_B16		0x00
+#	define	AHA_BID_1540_B64		0x30
+#	define	AHA_BID_1540B			0x41
+#	define	AHA_BID_1640			0x42
+#	define	AHA_BID_1740			0x43
+#	define	AHA_BID_1542C			0x44
+#	define  AHA_BID_1542CF			0x45  	/* BIOS v2.0x */
+
+	unsigned char		options;
+#	define	AHA_BOPT_STD			0x41	/* in 154x, standard model */
+
+	unsigned char		frl_1;		/* rev level */
+	unsigned char		frl_2;
+};
+#define AHA_CMD_MBO_IE		0x05
+	/* 1 byte follows: */
+#	define	AHA_MBO_DISABLE			0x00
+#	define	AHA_MBO_ENABLE			0x01
+
+#define AHA_CMD_SET_SELTO	0x06		/* select timeout */
+	/* 4 bytes follow: */
+struct aha_selto {
+	unsigned char		enable;
+	char			xxx;
+	unsigned char		timeo_msb;
+	unsigned char		timeo_lsb;
+};
+#define AHA_CMD_SET_BUSON	0x07
+	/* 1 byte value follows: 2..15 default 11 usecs */
+#define AHA_CMD_SET_BUSOFF	0x08
+	/* 1 byte value follows: 1..64 default 4 usecs */
+#define AHA_CMD_SET_XSPEED	0x09
+	/* 1 byte value follows: */
+#	define AHA_DMASPEED_5Mb		0x00
+#	define AHA_DMASPEED_7Mb		0x01
+#	define AHA_DMASPEED_8Mb		0x02
+#	define AHA_DMASPEED_10Mb	0x03
+#	define AHA_DMASPEED_6Mb		0x04
+	/* values in the range 80..ff encoded as follows:
+		bit 7	on	--> custom speed
+		bits 6..4	read pulse width
+			0	100ns
+			1	150
+			2	200
+			3	250
+			4	300
+			5	350
+			6	400
+			7	450
+		bit 3		strobe off time
+			0	100ns
+			1	150ns
+		bits 2..0	write pulse width
+			<same as read pulse>
+	 */
+#define AHA_CMD_FIND_DEVICES	0x0a
+	/* returns 8 bytes, each one is a bitmask of the LUNs
+	   available for the given target ID */
+struct aha_devs {
+	unsigned char		tgt_luns[8];
+};
+#define AHA_CMD_GET_CONFIG	0x0b
+	/* returns 3 bytes: */
+struct aha_conf {
+	unsigned char		dma_arbitration;/* bit N -> channel N */
+	unsigned char		intr_ch;/* bit N -> intr 9+N (but 13,16)*/
+	unsigned char		my_scsi_id;	/* both of I and T role */
+};
+#define AHA_CMD_ENB_TGT_MODE	0x0c
+	/* 2 bytes follow: */
+struct aha_tgt {
+	unsigned char		enable;
+	unsigned char		luns;	/* bitmask */
+};
+
+#define AHA_CMD_GET_SETUP	0x0d
+	/* 1 byte follows: allocation len (N) */
+	/* returns N bytes, 17 significant: */
+struct aha_setup {
+	BITFIELD_3( unsigned char,
+				initiate_SDT:1,
+				enable_parity:1,
+				res:6);
+	unsigned char		xspeed;	/* see above */
+	unsigned char		buson;
+	unsigned char		busoff;
+	unsigned char		n_mboxes;/* 0 if not initialized */
+	aha_address_t		mb_ptr; /* garbage if not inited */
+	struct {
+	    BITFIELD_3( unsigned char,
+	    			offset: 4,
+				period: 3,	/* 200 + 50 * N */
+				negotiated: 1);
+	} SDT_params[8];
+	unsigned char		no_disconnect;	/* bitmask */
+};
+
+#define AHA_CMD_WRITE_CH2	0x1a
+	/* 3 bytes (aha_address_t) follow for the buffer pointer */
+#define AHA_CMD_READ_CH2	0x1b
+	/* 3 bytes (aha_address_t) follow for the buffer pointer */
+#define AHA_CMD_WRITE_FIFO	0x1c
+	/* 3 bytes (aha_address_t) follow for the buffer pointer */
+#define AHA_CMD_READ_FIFO	0x1d
+	/* 3 bytes (aha_address_t) follow for the buffer pointer */
+#define AHA_CMD_ECHO		0x1f
+	/* 1 byte follows, which should then be read back */
+#define AHA_CMD_DIAG		0x20
+#define AHA_CMD_SET_OPT		0x21
+	/* 2+ bytes follow: */
+struct aha_diag {
+	unsigned char		parmlen;	/* bytes to follow */
+	unsigned char		no_disconnect;	/* bitmask */
+	/* rest is undefined */
+};
+
+#define AHA_EXT_BIOS            0x28    /* return extended bios info */
+#define AHA_MBX_ENABLE          0x29    /* enable mail box interface */
+struct aha_extbios {
+        unsigned char  	flags;		/* Bit 3 == 1 extended bios enabled */
+        unsigned char  	mailboxlock;    /* mail box lock code to unlock it */
+};
+
+/*
+ * Command Control Block
+ */
+typedef struct {
+	unsigned char		ccb_code;
+#	define		AHA_CCB_I_CMD		0x00
+#	define		AHA_CCB_T_CMD		0x01
+#	define		AHA_CCB_I_CMD_SG	0x02
+#	define		AHA_CCB_ICMD_R		0x03
+#	define		AHA_CCB_ICMD_SG_R	0x04
+#	define		AHA_CCB_BDEV_RST	0x81
+	BITFIELD_4( unsigned char,
+				ccb_lun:3,
+				ccb_in:1,
+				ccb_out:1,
+				ccb_scsi_id:3);
+	unsigned char		ccb_cmd_len;
+	unsigned char		ccb_reqsns_len;	/* if 1 no automatic reqsns*/
+	aha_length_t		ccb_datalen;
+	aha_address_t		ccb_dataptr;
+	aha_address_t		ccb_linkptr;
+	unsigned char		ccb_linkid;
+	unsigned char		ccb_hstatus;
+#	define	AHA_HST_SUCCESS			0x00
+#	define	AHA_HST_SEL_TIMEO		0x11
+#	define	AHA_HST_DATA_OVRUN		0x12
+#	define	AHA_HST_BAD_DISCONN		0x13
+#	define	AHA_HST_BAD_PHASE_SEQ		0x14
+#	define	AHA_HST_BAD_OPCODE		0x16
+#	define	AHA_HST_BAD_LINK_LUN		0x17
+#	define	AHA_HST_INVALID_TDIR		0x18
+#	define	AHA_HST_DUPLICATED_CCB		0x19
+#	define	AHA_HST_BAD_PARAM		0x1a
+
+	scsi2_status_byte_t	ccb_status;
+	unsigned char		ccb_xxx;
+	unsigned char		ccb_xxx1;
+	scsi_command_group_5	ccb_scsi_cmd;	/* cast as needed */
+} aha_ccb_t;
+
+/* For scatter/gather use a list of (len,ptr) segments, each field
+   is 3 bytes (aha_address_t) long. Max 17 segments, min 1 */
+
+/*
+ * Ring descriptor, aka Mailbox
+ */
+typedef union {
+
+    struct {
+	volatile unsigned char	mb_cmd;		/* Out mbox */
+#	define		mb_status mb_cmd	/* In mbox */
+
+	aha_address_t		mb_ptr;
+#define AHA_MB_SET_PTR(mbx,val)	AHA_ADDRESS_SET((mbx)->mb.mb_ptr,(val))
+#define AHA_MB_GET_PTR(mbx,val)	AHA_ADDRESS_GET((mbx)->mb.mb_ptr,(val))
+
+    } mb;
+
+    struct {					/* ccb required In mbox */
+	volatile unsigned char	mb_cmd;
+	BITFIELD_4( unsigned char,
+				mb_lun : 3,
+				mb_isa_send : 1,
+				mb_isa_recv : 1,
+				mb_initiator_id : 3);
+	unsigned char		mb_data_len_msb;
+	unsigned char		mb_data_len_mid;
+    } mbt;
+
+    unsigned int	bits;			/* quick access */
+
+} aha_mbox_t;
+
+/* Out mbox, values for the mb_cmd field */
+#define	AHA_MBO_FREE		0x00
+#define	AHA_MBO_START		0x01
+#define	AHA_MBO_ABORT		0x02
+
+/* In mbox, values for the mb_status field */
+#define	AHA_MBI_FREE		0x00
+#define	AHA_MBI_SUCCESS		0x01
+#define	AHA_MBI_ABORTED		0x02
+#define	AHA_MBI_NOT_FOUND	0x03
+#define	AHA_MBI_ERROR		0x04
+#define AHA_MBI_NEED_CCB	0x10
+
+/*
+ * Scatter/gather segment lists
+ */
+typedef struct {
+	aha_length_t	len;
+	aha_address_t	ptr;
+} aha_seglist_t;
+
+#define	AHA_MAX_SEGLIST		17		/* which means max 64Kb */
+#endif	/*_SCSI_AHA15_H_*/