[unix-history] / usr / src / sys / vax / if / if_exreg.h

/*
 * Copyright (c) 1982 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)if_exreg.h	6.2 (Berkeley) %G%
 */


struct	exdevice {
	char	xd_porta;	/* write on porta resets EXOS */
	char	xd_pad_a;
	char	xd_portb;	/* write on portb interrupts EXOS */
				/* read on portb returns status bits */
	char	xd_pad_b;
};

/* EXOS I/O PORT A write definitions */
#define	EX_RESET	0	/* value doesn't really matter... */

/* EXOS I/O PORT B write definitions */
#define	EX_NTRUPT	0

/* EXOS I/O PORT B read definitions */
#define	EX_TESTOK	1	/* set when self-diagnostics passed */
#define	EX_UNREADY	(1<<3)	/* set until EXOS ready to read from B */

/* message buffer status field definitions */
#define	MH_OWNER	1	/* mask for status bit for owner */
#define	MH_HOST		0	/* if 0, the host owns the buffer */
#define	MH_EXOS		1	/* if 1, the EXOS owns the buffer */

/* EXOS Link Level request codes */
#define	LLTRANSMIT	0xC	/* send a packet */
#define	LLRTRANSMIT	0xE	/* send a packet, and self-receive */
#define	LLRECEIVE	0xD	/* receive a packet */
#define	LLNET_MODE	0x8	/* read/write mode control objects */
#define	LLNET_ADDRS	0x9	/* read/write receive address slots */
#define	LLNET_RECV	0xA	/* read/alter receive slot enable bit */
#define	LLNET_STSTCS	0xB	/* read/reset network statistics objects */

/* Link Level return codes common to all requests */
#define	LL_OK		0	/* successful completion */
#define	LLX_MODE	0xA1	/* EXOS not in link level mode (impossible) */

/* LLTRANSMIT unique return codes */
#define	LLXM_1RTRY	0x1	/* successful xmission, 1 retry */
#define	LLXM_RTRYS	0x2	/* successful xmission, more than 1 retry */
#define	LLXM_NSQE	0x8	/* successful xmission, no SQE TEST signal */
#define	LLXM_CLSN	0x10	/* xmission failed, excess retries */
#define	LLXM_NCS	0x20	/* xmission failed, no carrier sense */
#define	LLXM_LNGTH	0x40	/* xmission failed, bad packet length */
#define	XMIT_BITS	"\7\7LENGTH\6CARRIER\5XCLSNS\4SQETST"
#define	LLXM_ERROR	(LLXM_NSQE|LLXM_CLSN|LLXM_NCS|LLXM_LNGTH)

/* LLRECEIVE unique return codes */
#define	LLRC_TRUNC	0x4	/* pkt received, but truncated to fit buffer */
#define	LLRC_ALIGN	0x10	/* pkt received, but with alignment error */
#define	LLRC_CRC	0x20	/* pkt received, but with CRC error */
#define	LLRC_BUFLEN	0x40	/* no pkt received, buffer less than 64 bytes */
				/* this should never happen here */
#define	RECV_BITS	"\7\7BUFLEN\6CRC\5ALIGN\3TRUNC"

/* LLNET_ADDRS unique return codes */
#define	LLNA_BADSLOT	0xD1	/* slot doesn't exist or can't be accessed */
#define	LLNA_BADADDR	0xD3	/* invalid address for designated slot */

/* LLNET_RECV unique return codes */
#define	LLNR_BADSLOT	0xD1	/* slot doesn't exist or can't be accessed */
#define	LLNR_BADADDR	0xD2	/* designated slot was empty */

/* address slot object indices */
#define	NULLSLOT	0	/* the null slot */
#define	MINMCSLOT	1	/* minimum multicast slot index */
#define	MAXMCSLOT	8	/* default maximum multicast slot index */
#define	PHYSSLOT	253	/* physical slot index */
#define	UNVRSSLOT	254	/* universal slot index */
#define	BROADSLOT	255	/* broadcast slot index */

/* request mask bit definitions */
#define	WRITE_OBJ	1	/* write the object */
#define	READ_OBJ	2	/* read the object */
#define	ENABLE_RCV	4	/* enable reception on designated slot */

/* NET_MODE options mask bit definitions */
#define	OPT_ALIGN	0x10	/* receive packets with alignment errors */
#define	OPT_CRC		0x20	/* receive packets with CRC errors */
#define	OPT_DSABLE	0x80	/* disconnect controller hardware */

/* NET_MODE mode field value definitions */
#define	MODE_OFF	0	/* stop transmission and reception */
#define	MODE_PERF	1	/* perfect multicast address filtering */
#define	MODE_HW		2	/* hardware-only multicast address filtering */
#define	MODE_PROM	3	/* promiscuous reception */

#define	NFRAGMENTS 1	/* number fragments that the EXOS will scatter/gather */
#define	EXMAXRBUF 1520	/* per EXOS 101 manual 5.3.7 (maybe 1518 would do) */

/*
 * N.B.  Structures below are carefully constructed so that
 * they correspond to the message formats that NX firmware
 * defines.  None of them should contain any compiler-instigated
 * padding.  Be especially careful about VAX C longword alignment!
 */

struct	stat_array {
	u_long	sa_fsent;	/* frames sent without errors */
	u_long	sa_xsclsn;	/* frames aborted excess collisions */
	u_long	sa_nsqe;	/* frames subject to heartbeat failure */
	u_long	sa_undef;	/* undefined (TDR on EXOS 101) */
	u_long	sa_frcvd;	/* frames received no errors */
	u_long	sa_align;	/* frames received alignment error */
	u_long	sa_crc;		/* frames received crc error */
	u_long	sa_flost;	/* frames lost */
};

struct	buf_blk {		/* packet/buffer block descriptor */
	u_short	bb_len;			/* length of block, in bytes */
	u_short	bb_addr[2];		/* address of block */
	/*
	 * Array above is really a single u_long field.
	 * We kludge its definition to defeat word-alignment.
	 * Access would look like:
	 *     longaddr = *(u_long *)bp->.mb_er.er_blks[0].bb_addr;
	 */
};

struct	net_mode {		/* read/write mode control objects */
/*12*/	u_char	nm_rqst;	/* request code */
/*13*/	u_char	nm_rply;	/* reply code */
/*14*/	u_char	nm_mask;		/* bit-wise switches for read, write */
/*15*/	u_char	nm_optn;		/* acceptable packet reception errors */
/*16*/	u_char	nm_mode;		/* EXOS filtering mode */
/*17*/
};

struct	net_addrs {		/* read/write receive address slots */
/*12*/	u_char	na_rqst;	/* request code */
/*13*/	u_char	na_rply;	/* reply code */
/*14*/	u_char	na_mask;		/* bit-wise switches for read, write */
/*15*/	u_char	na_slot;		/* index of address slot */
/*16*/	u_char	na_addrs[6];		/* address read and/or written */
/*22*/
};

struct	net_recv {		/* read/alter receive slot enable bit */
/*12*/	u_char	nr_rqst;	/* request code */
/*13*/	u_char	nr_rply;	/* reply code */
/*14*/	u_char	nr_mask;		/* bit-wise switches for read, write */
/*15*/	u_char	nr_slot;		/* index of address slot */
/*16*/
};

struct	net_ststcs {		/* read/reset network statistics objects */
/*12*/	u_char	ns_rqst;	/* request code */
/*13*/	u_char	ns_rply;	/* reply code */
/*14*/	u_char	ns_mask;		/* bit-wise switches for read, write */
/*15*/	u_char	ns_rsrv;		/* reserved for EXOS */
/*16*/	u_short	ns_nobj;		/* number of objects to work on */
/*18*/	u_short	ns_xobj;		/* index of first object to work on */
/*20*/	u_long	ns_bufp;		/* pointer to statistics buffer */
/*24*/
};

struct	enet_xmit {		/* send a packet on the Ethernet */
/*12*/	u_char	et_rqst;	/* request code */
/*13*/	u_char	et_rply;	/* reply code */
/*14*/	u_char	et_slot;		/* address slot matching dest address */
/*15*/	u_char	et_nblock;		/* number of blocks composing packet */
/*16*/	struct	buf_blk et_blks[NFRAGMENTS];	/* array of block descriptors */
/*22-64*/
};

struct	enet_recv {		/* receive a packet on the Ethernet */
/*12*/	u_char	er_rqst;	/* request code */
/*13*/	u_char	er_rply;	/* reply code */
/*14*/	u_char	er_slot;		/* address slot matching dest address */
/*15*/	u_char	er_nblock;		/* number of blocks composing buffer */
/*16*/	struct	buf_blk er_blks[NFRAGMENTS];	/* array of block descriptors */
/*22-64*/
};

/* we send requests and receive replys with the EXOS using this structure */
struct	ex_msg {
/*00*/	u_short	mb_link;	/* address of next message buffer */
/*02*/	u_char	mb_rsrv;	/* reserved for use by EXOS */
/*03*/	u_char	mb_status;	/* used bit-wise for message protocol */
/*04*/	u_short	mb_length;	/* length, in bytes, of the rest */
/*06*/	short	mb_1rsrv;	/* reserved for used by EXOS */
/*08*/	long	mb_mid;		/* available to user */
/*12*/	union	mb_all {
		struct	net_mode	mb_net_mode;
		struct	net_addrs	mb_net_addrs;
		struct	net_recv	mb_net_recv;
		struct	net_ststcs	mb_net_ststcs;
		struct	enet_xmit	mb_enet_xmit;
		struct	enet_recv	mb_enet_recv;
	} mb_all;
/* following field is used only by host, not read by board */
	struct	ex_msg *mb_next;	/* host's pointer to next message */
};
#define	mb_nm	mb_all.mb_net_mode
#define	mb_na	mb_all.mb_net_addrs
#define	mb_nr	mb_all.mb_net_recv
#define	mb_ns	mb_all.mb_net_ststcs
#define	mb_et	mb_all.mb_enet_xmit
#define	mb_er	mb_all.mb_enet_recv
#define	mb_rqst	mb_nm.nm_rqst
#define	mb_rply	mb_nm.nm_rply
#define	MBDATALEN (sizeof(union mb_all)+6)

struct	confmsg {
/*00*/	u_short	cm_1rsrv;	/* reserved, must be 1 */
/*02*/	char	cm_vc[4];	/* returns ASCII version code */
/*06*/	u_char	cm_cc;		/* returns config completion code */
/*07*/	u_char	cm_opmode;	/* specifies operation mode */
/*08*/	u_short	cm_dfo;		/* specifies host data format option */
/*10*/	u_char	cm_dcn1;	/* reserved, must be 1 */
/*11*/	u_char	cm_2rsrv[2];	/* reserved, must be 0 */
/*13*/	u_char	cm_ham;		/* specifies host address mode */
/*14*/	u_char	cm_3rsrv;	/* reserved, must be 0 */
/*15*/	u_char	cm_mapsiz;	/* reserved, must be 0 */
/*16*/	u_char	cm_byteptrn[4];	/* host data format option test pattern */
/*20*/	u_short	cm_wordptrn[2];
/*24*/	u_long	cm_lwordptrn;
/*28*/	u_char	cm_rsrvd[20];
/*48*/	u_long	cm_mba;		/* use 0xFFFFFFFF in link level mode */
/*52*/	u_char	cm_nproc;	/* use 0xFF in link level mode */
/*53*/	u_char	cm_nmbox;	/* use 0xFF in link level mode */
/*54*/	u_char	cm_nmcast;	/* use 0xFF in link level mode */
/*55*/	u_char	cm_nhost;	/* use 1 in link level mode */

	/* the next five parameters define the request message queue */
/*56*/	u_long	cm_h2xba;	/* base address of message queue */
/*60*/	u_short	cm_h2xhdr;	/* address offset of msg Q header */
/*62*/	u_char	cm_h2xtyp;	/* interrupt type */
/*63*/	u_char	cm_h2xval;	/* interrupt value (not used) */
/*64*/	u_short	cm_h2xaddr;	/* interrupt vector */
/*66*/	u_short	cm_h2xpad;	/* pad out unused portion of vector */

	/* the next five parameters define the reply message queue */
/*68*/	u_long	cm_x2hba;	/* base address of message queue */
/*72*/	u_short	cm_x2hhdr;	/* address offset of msg Q header */
/*74*/	u_char	cm_x2htyp;	/* interrupt type */
/*75*/	u_char	cm_x2hval;	/* interrupt value (not used) */
/*76*/	u_short	cm_x2haddr;	/* interrupt vector */
/*78*/	u_short	cm_x2hpad;	/* pad out unused portion of vector */
/*80*/
};
Commit	Line	Data
da7c5cc6 KM	1	/*
	2	* Copyright (c) 1982 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*
	6	* @(#)if_exreg.h 6.2 (Berkeley) %G%
	7	*/
	8
1f50415f MK	9
	10	struct exdevice {
	11	char xd_porta; /* write on porta resets EXOS */
	12	char xd_pad_a;
	13	char xd_portb; /* write on portb interrupts EXOS */
	14	/* read on portb returns status bits */
	15	char xd_pad_b;
	16	};
	17
	18	/* EXOS I/O PORT A write definitions */
	19	#define EX_RESET 0 /* value doesn't really matter... */
	20
	21	/* EXOS I/O PORT B write definitions */
	22	#define EX_NTRUPT 0
	23
	24	/* EXOS I/O PORT B read definitions */
	25	#define EX_TESTOK 1 /* set when self-diagnostics passed */
	26	#define EX_UNREADY (1<<3) /* set until EXOS ready to read from B */
	27
	28	/* message buffer status field definitions */
	29	#define MH_OWNER 1 /* mask for status bit for owner */
	30	#define MH_HOST 0 /* if 0, the host owns the buffer */
	31	#define MH_EXOS 1 /* if 1, the EXOS owns the buffer */
	32
	33	/* EXOS Link Level request codes */
	34	#define LLTRANSMIT 0xC /* send a packet */
	35	#define LLRTRANSMIT 0xE /* send a packet, and self-receive */
	36	#define LLRECEIVE 0xD /* receive a packet */
	37	#define LLNET_MODE 0x8 /* read/write mode control objects */
	38	#define LLNET_ADDRS 0x9 /* read/write receive address slots */
	39	#define LLNET_RECV 0xA /* read/alter receive slot enable bit */
	40	#define LLNET_STSTCS 0xB /* read/reset network statistics objects */
	41
	42	/* Link Level return codes common to all requests */
	43	#define LL_OK 0 /* successful completion */
	44	#define LLX_MODE 0xA1 /* EXOS not in link level mode (impossible) */
	45
	46	/* LLTRANSMIT unique return codes */
	47	#define LLXM_1RTRY 0x1 /* successful xmission, 1 retry */
	48	#define LLXM_RTRYS 0x2 /* successful xmission, more than 1 retry */
	49	#define LLXM_NSQE 0x8 /* successful xmission, no SQE TEST signal */
	50	#define LLXM_CLSN 0x10 /* xmission failed, excess retries */
	51	#define LLXM_NCS 0x20 /* xmission failed, no carrier sense */
	52	#define LLXM_LNGTH 0x40 /* xmission failed, bad packet length */
	53	#define XMIT_BITS "\7\7LENGTH\6CARRIER\5XCLSNS\4SQETST"
	54	#define LLXM_ERROR (LLXM_NSQE\|LLXM_CLSN\|LLXM_NCS\|LLXM_LNGTH)
	55
	56	/* LLRECEIVE unique return codes */
	57	#define LLRC_TRUNC 0x4 /* pkt received, but truncated to fit buffer */
	58	#define LLRC_ALIGN 0x10 /* pkt received, but with alignment error */
	59	#define LLRC_CRC 0x20 /* pkt received, but with CRC error */
	60	#define LLRC_BUFLEN 0x40 /* no pkt received, buffer less than 64 bytes */
	61	/* this should never happen here */
	62	#define RECV_BITS "\7\7BUFLEN\6CRC\5ALIGN\3TRUNC"
	63
	64	/* LLNET_ADDRS unique return codes */
	65	#define LLNA_BADSLOT 0xD1 /* slot doesn't exist or can't be accessed */
	66	#define LLNA_BADADDR 0xD3 /* invalid address for designated slot */
	67
	68	/* LLNET_RECV unique return codes */
	69	#define LLNR_BADSLOT 0xD1 /* slot doesn't exist or can't be accessed */
	70	#define LLNR_BADADDR 0xD2 /* designated slot was empty */
	71
	72	/* address slot object indices */
73	#define NULLSLOT 0 /* the null slot */
74	#define MINMCSLOT 1 /* minimum multicast slot index */
75	#define MAXMCSLOT 8 /* default maximum multicast slot index */
76	#define PHYSSLOT 253 /* physical slot index */
77	#define UNVRSSLOT 254 /* universal slot index */
78	#define BROADSLOT 255 /* broadcast slot index */
79
80	/* request mask bit definitions */
81	#define WRITE_OBJ 1 /* write the object */
82	#define READ_OBJ 2 /* read the object */
83	#define ENABLE_RCV 4 /* enable reception on designated slot */
84
85	/* NET_MODE options mask bit definitions */
86	#define OPT_ALIGN 0x10 /* receive packets with alignment errors */
87	#define OPT_CRC 0x20 /* receive packets with CRC errors */
88	#define OPT_DSABLE 0x80 /* disconnect controller hardware */
89
90	/* NET_MODE mode field value definitions */
91	#define MODE_OFF 0 /* stop transmission and reception */
92	#define MODE_PERF 1 /* perfect multicast address filtering */
93	#define MODE_HW 2 /* hardware-only multicast address filtering */
94	#define MODE_PROM 3 /* promiscuous reception */
95
96	#define NFRAGMENTS 1 /* number fragments that the EXOS will scatter/gather */
97	#define EXMAXRBUF 1520 /* per EXOS 101 manual 5.3.7 (maybe 1518 would do) */
98
99	/*
100	* N.B. Structures below are carefully constructed so that
101	* they correspond to the message formats that NX firmware
102	* defines. None of them should contain any compiler-instigated
103	* padding. Be especially careful about VAX C longword alignment!
104	*/
105
106	struct stat_array {
107	u_long sa_fsent; /* frames sent without errors */
108	u_long sa_xsclsn; /* frames aborted excess collisions */
109	u_long sa_nsqe; /* frames subject to heartbeat failure */
110	u_long sa_undef; /* undefined (TDR on EXOS 101) */
111	u_long sa_frcvd; /* frames received no errors */
112	u_long sa_align; /* frames received alignment error */
113	u_long sa_crc; /* frames received crc error */
114	u_long sa_flost; /* frames lost */
115	};
116
117	struct buf_blk { /* packet/buffer block descriptor */
118	u_short bb_len; /* length of block, in bytes */
119	u_short bb_addr[2]; /* address of block */
120	/*
121	* Array above is really a single u_long field.
122	* We kludge its definition to defeat word-alignment.
123	* Access would look like:
124	* longaddr = (u_long )bp->.mb_er.er_blks[0].bb_addr;
125	*/
126	};
127
128	struct net_mode { /* read/write mode control objects */
129	/12/ u_char nm_rqst; /* request code */
130	/13/ u_char nm_rply; /* reply code */
131	/14/ u_char nm_mask; /* bit-wise switches for read, write */
132	/15/ u_char nm_optn; /* acceptable packet reception errors */
133	/16/ u_char nm_mode; /* EXOS filtering mode */
134	/17/
135	};
136
137	struct net_addrs { /* read/write receive address slots */
138	/12/ u_char na_rqst; /* request code */
139	/13/ u_char na_rply; /* reply code */
140	/14/ u_char na_mask; /* bit-wise switches for read, write */
141	/15/ u_char na_slot; /* index of address slot */
142	/16/ u_char na_addrs[6]; /* address read and/or written */
143	/22/
144	};
145
146	struct net_recv { /* read/alter receive slot enable bit */
147	/12/ u_char nr_rqst; /* request code */
148	/13/ u_char nr_rply; /* reply code */
149	/14/ u_char nr_mask; /* bit-wise switches for read, write */
150	/15/ u_char nr_slot; /* index of address slot */
151	/16/
152	};
153
154	struct net_ststcs { /* read/reset network statistics objects */
155	/12/ u_char ns_rqst; /* request code */
156	/13/ u_char ns_rply; /* reply code */
157	/14/ u_char ns_mask; /* bit-wise switches for read, write */
158	/15/ u_char ns_rsrv; /* reserved for EXOS */
159	/16/ u_short ns_nobj; /* number of objects to work on */
160	/18/ u_short ns_xobj; /* index of first object to work on */
161	/20/ u_long ns_bufp; /* pointer to statistics buffer */
162	/24/
163	};
164
165	struct enet_xmit { /* send a packet on the Ethernet */
166	/12/ u_char et_rqst; /* request code */
167	/13/ u_char et_rply; /* reply code */
168	/14/ u_char et_slot; /* address slot matching dest address */
169	/15/ u_char et_nblock; /* number of blocks composing packet */
170	/16/ struct buf_blk et_blks[NFRAGMENTS]; /* array of block descriptors */
171	/22-64/
172	};
173
174	struct enet_recv { /* receive a packet on the Ethernet */
175	/12/ u_char er_rqst; /* request code */
176	/13/ u_char er_rply; /* reply code */
177	/14/ u_char er_slot; /* address slot matching dest address */
178	/15/ u_char er_nblock; /* number of blocks composing buffer */
179	/16/ struct buf_blk er_blks[NFRAGMENTS]; /* array of block descriptors */
180	/22-64/
181	};
182
183	/* we send requests and receive replys with the EXOS using this structure */
184	struct ex_msg {
185	/00/ u_short mb_link; /* address of next message buffer */
186	/02/ u_char mb_rsrv; /* reserved for use by EXOS */
187	/03/ u_char mb_status; /* used bit-wise for message protocol */
188	/04/ u_short mb_length; /* length, in bytes, of the rest */
189	/06/ short mb_1rsrv; /* reserved for used by EXOS */
190	/08/ long mb_mid; /* available to user */
191	/12/ union mb_all {
192	struct net_mode mb_net_mode;
193	struct net_addrs mb_net_addrs;
194	struct net_recv mb_net_recv;
195	struct net_ststcs mb_net_ststcs;
196	struct enet_xmit mb_enet_xmit;
197	struct enet_recv mb_enet_recv;
198	} mb_all;
199	/* following field is used only by host, not read by board */
200	struct ex_msg mb_next; / host's pointer to next message */
201	};
202	#define mb_nm mb_all.mb_net_mode
203	#define mb_na mb_all.mb_net_addrs
204	#define mb_nr mb_all.mb_net_recv
205	#define mb_ns mb_all.mb_net_ststcs
206	#define mb_et mb_all.mb_enet_xmit
207	#define mb_er mb_all.mb_enet_recv
208	#define mb_rqst mb_nm.nm_rqst
209	#define mb_rply mb_nm.nm_rply
210	#define MBDATALEN (sizeof(union mb_all)+6)
211
212	struct confmsg {
213	/00/ u_short cm_1rsrv; /* reserved, must be 1 */
214	/02/ char cm_vc[4]; /* returns ASCII version code */
215	/06/ u_char cm_cc; /* returns config completion code */
216	/07/ u_char cm_opmode; /* specifies operation mode */
217	/08/ u_short cm_dfo; /* specifies host data format option */
218	/10/ u_char cm_dcn1; /* reserved, must be 1 */
219	/11/ u_char cm_2rsrv[2]; /* reserved, must be 0 */
220	/13/ u_char cm_ham; /* specifies host address mode */
221	/14/ u_char cm_3rsrv; /* reserved, must be 0 */
222	/15/ u_char cm_mapsiz; /* reserved, must be 0 */
223	/16/ u_char cm_byteptrn[4]; /* host data format option test pattern */
224	/20/ u_short cm_wordptrn[2];
225	/24/ u_long cm_lwordptrn;
226	/28/ u_char cm_rsrvd[20];
227	/48/ u_long cm_mba; /* use 0xFFFFFFFF in link level mode */
228	/52/ u_char cm_nproc; /* use 0xFF in link level mode */
229	/53/ u_char cm_nmbox; /* use 0xFF in link level mode */
230	/54/ u_char cm_nmcast; /* use 0xFF in link level mode */
231	/55/ u_char cm_nhost; /* use 1 in link level mode */
232
233	/* the next five parameters define the request message queue */
234	/56/ u_long cm_h2xba; /* base address of message queue */
235	/60/ u_short cm_h2xhdr; /* address offset of msg Q header */
236	/62/ u_char cm_h2xtyp; /* interrupt type */
237	/63/ u_char cm_h2xval; /* interrupt value (not used) */
238	/64/ u_short cm_h2xaddr; /* interrupt vector */
239	/66/ u_short cm_h2xpad; /* pad out unused portion of vector */
240
241	/* the next five parameters define the reply message queue */
242	/68/ u_long cm_x2hba; /* base address of message queue */
243	/72/ u_short cm_x2hhdr; /* address offset of msg Q header */
244	/74/ u_char cm_x2htyp; /* interrupt type */
245	/75/ u_char cm_x2hval; /* interrupt value (not used) */
246	/76/ u_short cm_x2haddr; /* interrupt vector */
247	/78/ u_short cm_x2hpad; /* pad out unused portion of vector */
248	/80/
249	};
250