xref: /illumos-gate/usr/src/uts/common/sys/sysevent_impl.h (revision c6fc6ddd482fa5c17788a38bd238258f2c22597c)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #ifndef	_SYS_SYSEVENT_IMPL_H
27 #define	_SYS_SYSEVENT_IMPL_H
28 
29 #include <sys/nvpair.h>
30 #include <sys/id_space.h>
31 #include <sys/door.h>
32 
33 #ifdef	__cplusplus
34 extern "C" {
35 #endif
36 
37 typedef uint64_t se_data_t;
38 
39 /*
40  * The following data structure assist in loading and extracting event
41  * header and attribute data into contiguous memory.  Access to all typed
42  * data done so on 64-bit boundaries.  *Do Not* alter any of the structures
43  * defined below without thorough thought and testing.
44  */
45 
46 /* Attribute name */
47 typedef struct se_name {
48 	int32_t		name_sz;
49 	int32_t		name_pad;
50 	se_data_t	name;	/* 64-bit aligned offset */
51 } se_name_t;
52 
53 /* Attribute value */
54 typedef struct se_value {
55 	int32_t		value_type;	/* data type */
56 	int32_t		value_sz;
57 	se_data_t	value;		/* data value - 64-bit aligned offset */
58 } se_value_t;
59 
60 /* sysevent internal attribute name-value pair stored in contiguous memory */
61 typedef struct sysevent_attr_impl {
62 	int32_t		se_attr_sz;	/* Size of attribute data */
63 	int32_t		se_attr_pad;	/* pad */
64 	se_data_t	se_attr_name;	/* name of data attribute */
65 	se_data_t	se_attr_val;	/* value and type of data */
66 } sysevent_attr_impl_t;
67 
68 /* Attribute list states */
69 #define	ATTR_DETACHED	0
70 #define	ATTR_ATTACHED	1
71 
72 /*
73  * The following type definitions describe a sysevent object that is
74  * generated by a call to sysevent_alloc and sent to userland.
75  */
76 
77 /*
78  * sysevent event header information -
79  * 	contained in every event generated.  The header and the event
80  *	must remain 64-bit aligned.  The header, up to the attribute
81  *	offset, can be contained in a single cache line.
82  */
83 typedef struct sysevent_hdr {
84 	sysevent_id_t	se_id;		/* unique identifier */
85 	uint32_t	se_version;	/* version of this data structure */
86 	uint32_t	se_flag;
87 	uint32_t	se_class;	/* event class id - reserved */
88 	uint32_t	se_subclass;	/* event subclass id - reserved */
89 	int32_t		se_payload_sz;	/* size of attr data + strings */
90 	uint16_t	se_subclass_off; /* offset to subclass string */
91 	uint16_t	se_pub_off;	/* offset to publisher string */
92 	uint64_t	se_attr_off;	/* pointer or offset to attr data */
93 } sysevent_hdr_t;
94 
95 /* sysevent event buffer - 64-bit aligned offsets */
96 typedef struct sys_event_impl {
97 	sysevent_hdr_t	se_header;
98 	se_data_t	se_class_name;	/* class string in contig memory */
99 	se_data_t	se_subclass_name; /* subclass string in contig memory */
100 	se_data_t	se_pub;		/* publisher string in contig mem */
101 	se_data_t 	se_attr_buf;	/* contiguous attribute memory	*/
102 } sysevent_impl_t;
103 
104 /* Helpful defines */
105 #define	seh_version	se_header.se_version
106 #define	seh_class	se_header.se_class
107 #define	seh_subclass	se_header.se_subclass
108 #define	seh_seq		se_header.se_id.eid_seq
109 #define	seh_time	se_header.se_id.eid_ts
110 #define	seh_subclass_off se_header.se_subclass_off
111 #define	seh_pub_off	se_header.se_pub_off
112 #define	seh_attr_off	se_header.se_attr_off
113 #define	seh_payload_sz	se_header.se_payload_sz
114 #define	seh_flag	se_header.se_flag
115 
116 /* Event buffer version */
117 #define	SYS_EVENT_VERSION	0
118 
119 /* Event buffer flags */
120 #define	SE_PACKED_BUF	1
121 
122 #define	SYSEVENT_IMPL(ev)	((sysevent_impl_t *)(void *)(ev))
123 #define	SE_VERSION(ev)		(SYSEVENT_IMPL(ev)->seh_version)
124 #define	SE_CLASS(ev)		(SYSEVENT_IMPL(ev)->seh_class)
125 #define	SE_SUBCLASS(ev)		(SYSEVENT_IMPL(ev)->seh_subclass)
126 #define	SE_SEQ(ev)		(SYSEVENT_IMPL(ev)->seh_seq)
127 #define	SE_TIME(ev)		(SYSEVENT_IMPL(ev)->seh_time)
128 #define	SE_SUBCLASS_OFF(ev)	(SYSEVENT_IMPL(ev)->seh_subclass_off)
129 #define	SE_PUB_OFF(ev)		(SYSEVENT_IMPL(ev)->seh_pub_off)
130 #define	SE_PAYLOAD_SZ(ev)	(SYSEVENT_IMPL(ev)->seh_payload_sz)
131 #define	SE_FLAG(ev)		(SYSEVENT_IMPL(ev)->seh_flag)
132 #define	SE_SIZE(ev)		(sizeof (sysevent_impl_t) + SE_PAYLOAD_SZ(ev))
133 #define	SE_CLASS_NAME(ev)	((char *)&(SYSEVENT_IMPL(ev)->se_class_name))
134 #define	SE_SUBCLASS_NAME(ev)	((char *)((caddr_t)(ev) + SE_SUBCLASS_OFF(ev)))
135 #define	SE_PUB_NAME(ev)		((char *)((caddr_t)(ev) + SE_PUB_OFF(ev)))
136 
137 /*
138  * Attribute data can be stored in contiguous memory or
139  * as a list of attribute data elements.  The storage format is determined
140  * by the SE_PACKED_BUF flag in the event buffer flags.
141  *
142  */
143 
144 /* 64-bit boundary alignment function */
145 #define	SE_ALIGN(x)	((((ulong_t)x) + 7ul) & ~7ul)
146 
147 /* Access to unpacked attribute list */
148 #define	SE_ATTR_PTR(ev)		(SYSEVENT_IMPL(ev)->seh_attr_off)
149 
150 /* Offset to packed attribute data */
151 #define	SE_ATTR_OFF(ev)	SE_PUB_OFF(ev) + SE_ALIGN(strlen(SE_PUB_NAME(ev)) + 1)
152 
153 /* syseventd door */
154 #define	LOGEVENT_DOOR_UPCALL	"/var/run/sysevent_door"
155 
156 /*
157  * door upcall data structures
158  */
159 typedef struct log_event_upcall_arg {
160 	int32_t retcode;
161 	int32_t	pad;
162 	sysevent_impl_t buf;
163 } log_event_upcall_arg_t;
164 
165 typedef struct log_eventq {
166 	struct log_eventq	*next;
167 	log_event_upcall_arg_t	arg;
168 } log_eventq_t;
169 
170 /* Syseventd Channel structures */
171 
172 #define	MAX_CHAN	256	/* Maximum channels per system */
173 #define	MAX_SUBSCRIBERS	100	/* Maximum subscribers per channel */
174 #define	MAX_PUBLISHERS	1	/* Maximum publishers per channel */
175 
176 /*
177  * Channel-based subscription structures
178  */
179 
180 /* Class hashing defines */
181 #define	CLASS_HASH_SZ	63
182 #define	CLASS_HASH(class_name)	((hash_func(class_name) \
183 				% CLASS_HASH_SZ) + 1)
184 #define	CHAN_HASH_SZ	32
185 
186 typedef struct subclass_lst {
187 	struct subclass_lst	*sl_next;
188 	char			*sl_name;
189 	uchar_t			sl_num[MAX_SUBSCRIBERS + 1];
190 } subclass_lst_t;
191 
192 typedef struct class_lst {
193 	struct class_lst	*cl_next;
194 	char			*cl_name;
195 	struct subclass_lst	*cl_subclass_list;
196 } class_lst_t;
197 
198 /* User/Kernel Structure to pass event registration modctl data */
199 typedef struct se_pubsub {
200 	uint32_t	ps_buflen;
201 	uint32_t	ps_channel_name_len;
202 	uint32_t	ps_id;
203 	uint32_t	ps_op;
204 	uint32_t	ps_type;
205 } se_pubsub_t;
206 
207 /* op defines */
208 #define	SE_REGISTER		0
209 #define	SE_UNREGISTER		1
210 #define	SE_CLEANUP		2
211 #define	SE_OPEN_REGISTRATION	3
212 #define	SE_CLOSE_REGISTRATION	4
213 #define	SE_BIND_REGISTRATION	5
214 #define	SE_UNBIND_REGISTRATION	6
215 #define	SE_GET_REGISTRATION	7
216 
217 /* type defines */
218 #define	SUBSCRIBER	0
219 #define	PUBLISHER	1
220 
221 /* nvpair names */
222 #define	CLASS_NAME	"class"
223 
224 #ifdef	_KERNEL
225 
226 typedef struct sysevent_channel_descriptor {
227 	char   *scd_channel_name;	/* Name of channel */
228 	struct sysevent_channel_descriptor *scd_next;
229 	int    scd_ref_cnt;		/* Reference count of channel opens */
230 	id_space_t *scd_subscriber_cache;	/* cache of subscriber ids */
231 	id_space_t *scd_publisher_cache;	/* cache of publisher ids */
232 	uchar_t scd_subscriber_ids[MAX_SUBSCRIBERS + 1]; /* used sub ids */
233 	uchar_t scd_publisher_ids[MAX_PUBLISHERS + 1];	/* used  pub ids */
234 	class_lst_t *scd_class_list_tbl[CLASS_HASH_SZ + 1];
235 } sysevent_channel_descriptor_t;
236 
237 /*
238  * log_sysevent private interfaces
239  */
240 void log_event_init(void);
241 void log_sysevent_flushq(int cmd, uint_t flag);
242 int log_sysevent_filename(char *file);
243 int log_usr_sysevent(sysevent_t *ev, int ev_size, sysevent_id_t *eid);
244 int log_sysevent_copyout_data(sysevent_id_t *eid, size_t ubuflen, caddr_t ubuf);
245 int log_sysevent_free_data(sysevent_id_t *eid);
246 int log_sysevent_register(char *channel_name, char *data, se_pubsub_t *udata);
247 uint64_t log_sysevent_new_id();
248 
249 /*
250  * Structures and definitions for general purpose event channels
251  */
252 
253 /* Limits */
254 #define	EVCH_MAX_CHANNELS		1024
255 #define	EVCH_MAX_BINDS_PER_CHANNEL	512
256 #define	EVCH_MAX_SUBSCRIPTIONS		32
257 #define	EVCH_SUBPOOLFACT		8
258 #define	EVCH_DEFAULT_EVENTS		2000
259 #define	EVCH_MAX_TRY_DELIVERY		3
260 
261 /* Linkage element for evch_dlist_t lists */
262 typedef struct evch_dlelem {
263 	struct evch_dlelem	*dl_next;
264 	struct evch_dlelem	*dl_prev;
265 } evch_dlelem_t;
266 
267 /* List head */
268 typedef struct {
269 	evch_dlelem_t	dh_head;
270 	int		dh_count;
271 } evch_dlist_t;
272 
273 /* Placeholder for elements in a evch_squeue_t queue */
274 typedef struct evch_qelem {
275 	struct evch_qelem	*q_next;
276 	void			*q_objref;
277 	size_t			q_objsize;
278 } evch_qelem_t;
279 
280 /* Queue head data */
281 typedef struct {
282 	evch_qelem_t	*sq_head;
283 	evch_qelem_t	*sq_tail;
284 	uint32_t 	sq_count;
285 	uint32_t 	sq_highwm;
286 } evch_squeue_t;
287 
288 /*
289  * Defines for event queue routines
290  */
291 #define	EVQ_IGNORE	1
292 #define	EVQ_DELIVER	2
293 
294 #define	EVQ_CONT	0
295 #define	EVQ_AGAIN	1
296 #define	EVQ_SLEEP	2
297 
298 /* Call back routine typedefs */
299 typedef int (*filter_f)(void *, void *);
300 typedef int (*deliver_f)(void *, void *);
301 typedef int (*kerndlv_f)(void *, void *);
302 typedef void (*destr_f)(void *, void *);
303 typedef int (*compare_f)(evch_dlelem_t *, char *);
304 
305 /*
306  * Event structure handled by evch_evq_* functions. Sysevent type events are
307  * stored as the payload.
308  */
309 typedef struct {
310 	uint32_t	ge_size;	/* Total size of event structure */
311 	uint32_t	ge_refcount;	/* No of queues event is linked to */
312 	destr_f		ge_destruct;	/* Destructor for event structure */
313 	uint32_t	*ge_dstcookie;	/* Cookie for destructor function */
314 	uchar_t		ge_payload[1];	/* Placeholder for event data */
315 } evch_gevent_t;
316 
317 /*
318  * Event queue descriptor
319  */
320 typedef struct {
321 	evch_squeue_t	eq_eventq;	/* Protected by eq_dtmutex */
322 	kt_did_t	eq_thrid;	/* Id delivery thread */
323 	kmutex_t	eq_queuemx;	/* Protect. of this struct and ev q */
324 	kcondvar_t	eq_thrsleepcv;	/* Delivery thread sleeps on empty q */
325 	int		eq_dactive;	/* Event delivery is in progress */
326 	kcondvar_t	eq_dactivecv;	/* Unsubscr. has to wait on this */
327 	evch_dlist_t	eq_subscr;	/* Chain of all evch_evqsub_t */
328 	uint32_t	eq_nsleep;	/* Statistic: Publisher set to sleep */
329 	int		eq_holdmode;	/* Hold event delivery */
330 	evch_gevent_t	*eq_curevent;	/* Event currently beeing delivered */
331 	evch_qelem_t	*eq_nextev;	/* For iterating over events in a q */
332 	kcondvar_t	eq_onholdcv;	/* To signal hold mode of deliv. thr. */
333 	uchar_t		eq_tabortflag;	/* Request to abort delivery thread */
334 } evch_eventq_t;
335 
336 /*
337  * Event queue per subscriber structure
338  */
339 typedef struct {
340 	evch_dlelem_t	su_link;
341 	filter_f	su_filter;	/* Event filter function pointer */
342 	void		*su_fcookie;	/* cookie for event filter */
343 	deliver_f	su_callb;	/* Event delivery callback */
344 	void		*su_cbcookie;	/* callback cookie */
345 } evch_evqsub_t;
346 
347 /* Eveny delivery type */
348 #define	EVCH_DELKERN		1	/* Kernel event delivery */
349 #define	EVCH_DELDOOR		2	/* User event delivery via doors */
350 
351 /*
352  * Per channel subscriber data structure. Chained in a linked list to an
353  * event channel and to a binding.
354  */
355 typedef struct chsubd {
356 	evch_dlelem_t	sd_link;	/* Links all subscribers of this ch. */
357 	struct chsubd	*sd_subnxt;	/* Links all subscr. for a binding */
358 	char		*sd_ident;	/* Subscriber identifier */
359 	evch_eventq_t	*sd_queue;	/* Event queue for this subscriber */
360 	evch_evqsub_t	*sd_msub;	/* Main event queue subscr. */
361 	char		*sd_classname;	/* Filter criteria */
362 	size_t		sd_clnsize;	/* Size of sd_classname buffer */
363 	evch_evqsub_t	*sd_ssub;	/* Subscriber queue subscr. */
364 	int		sd_type;	/* Type of event delivery */
365 	kerndlv_f	sd_callback;	/* Callback for kernel delivery */
366 	void		*sd_cbcookie;	/* Cookie for kernel delivery */
367 	door_handle_t	sd_door;	/* Door handle for user delivery */
368 	int		sd_active;	/* Subscription is in use indicator */
369 	pid_t		sd_pid;		/* PID of subscribing process */
370 	uint8_t		sd_persist;	/* Persistent user land subscription */
371 	uint8_t		sd_dump;	/* Dump with sysevent_evc_walk_* */
372 } evch_subd_t;
373 
374 /*
375  * General purpose event channel descriptor structure. This is the main
376  * structure for event subscribing, publishing, delivery to/from an event
377  * channel.
378  */
379 typedef struct {
380 	evch_dlelem_t	ch_link;	/* Must be first elem. of structure */
381 	char		*ch_name;	/* Channel name */
382 	size_t		ch_namelen;	/* Length of channel name buffer */
383 	kmutex_t	ch_mutex;	/* To protect this structure */
384 	evch_eventq_t	*ch_queue;	/* Publisher event queue */
385 	evch_dlist_t	ch_subscr;	/* List of subscr. data (evch_subd_t) */
386 	uint32_t	ch_bindings;	/* No of bindings to this channel */
387 	int		ch_maxbinds;	/* Maximum number of binds */
388 	uid_t		ch_uid;		/* Creators effective user id */
389 	gid_t		ch_gid;		/* Creators effective group id */
390 	kmutex_t	ch_pubmx;	/* Mutex for ch_pubcv and ch_nevents */
391 	kcondvar_t	ch_pubcv;	/* To set publisher to sleep */
392 	uint32_t	ch_nevents;	/* Current number of events */
393 	uint32_t	ch_maxev;	/* Maximum number of events */
394 	int		ch_maxsubscr;	/* Maximum number of subscriptions */
395 	int		ch_holdpend;	/* Hold pending events mode if != 0 */
396 	time_t		ch_ctime;	/* Channel creation time */
397 } evch_chan_t;
398 
399 /*
400  * Channel binding structure. Allocated per binding to a channel. Protected
401  * by locking the channel structure
402  */
403 typedef struct {
404 	evch_chan_t	*bd_channel;
405 	evch_subd_t	*bd_sublst;	/* chain of all subscriptions */
406 } evch_bind_t;
407 
408 /*
409  * Structure to keep a snapshot of all events of a channel
410  */
411 typedef struct {
412 	evch_eventq_t	*sn_queue;	/* Event queue with snapshot of ev's */
413 	sysevent_impl_t	*sn_nxtev;	/* Pointer to find next event */
414 } evchanq_t;
415 
416 /* Project privat interfaces */
417 evchan_t *evch_usrchanopen(const char *name, uint32_t flags, int *err);
418 void evch_usrchanclose(evchan_t *cbp);
419 sysevent_impl_t *evch_usrallocev(size_t evsize, uint32_t flags);
420 void evch_usrfreeev(sysevent_impl_t *ev);
421 int evch_usrpostevent(evchan_t *bp, sysevent_impl_t *ev, uint32_t flags);
422 int evch_usrsubscribe(evchan_t *bp, const char *sid, const char *class,
423     int d, uint32_t flags);
424 int evch_usrcontrol_set(evchan_t *bp, int cmd, uint32_t value);
425 int evch_usrcontrol_get(evchan_t *bp, int cmd, uint32_t *value);
426 void evch_usrunsubscribe(evchan_t *bp, const char *subid, uint32_t flag);
427 int evch_usrgetchnames(char *buf, size_t size);
428 int evch_usrgetchdata(char *chname, void *buf, size_t size);
429 
430 void sysevent_evc_init();
431 void sysevent_evc_thrinit();
432 evchanq_t *sysevent_evc_walk_init(evchan_t *, char *);
433 sysevent_t *sysevent_evc_walk_step(evchanq_t *);
434 void sysevent_evc_walk_fini(evchanq_t *);
435 char *sysevent_evc_event_attr(sysevent_t *, size_t *);
436 
437 #endif /* _KERNEL */
438 
439 /*
440  * Structures and limits to deliver channel data to syseventadm
441  */
442 #define	EVCH_MAX_DATA_SIZE	(1024 * 1024)
443 
444 typedef struct {
445 	uint32_t	sb_nextoff;	/* Offset to next subscr info struct */
446 	uint32_t	sb_stroff;	/* Offset to strings */
447 	uint32_t	sb_clnamoff;	/* Offset of class in sb_strings */
448 	uint32_t	sb_pid;		/* Subscriber process id */
449 	uint32_t	sb_nevents;	/* Current no of event in sub q */
450 	uint32_t	sb_evhwm;	/* High watermark of sub q */
451 	uint32_t	sb_persist;	/* != 0 if subscription persists */
452 	uint32_t	sb_status;	/* != 0 if subscription is inactive */
453 	uint32_t	sb_active;	/* > 0 if subscription is in use */
454 	uint32_t	sb_dump;	/* != 0 if sub will be dumped */
455 	char		sb_strings[1];	/* String space for subid and class */
456 } sev_subinfo_t;
457 
458 typedef struct {
459 	uint32_t	cd_version;	/* Version of this structure */
460 	uint32_t	cd_suboffs;	/* Offset of subscriber info struct */
461 	uint64_t	cd_ctime;	/* Creation time */
462 	uint32_t	cd_uid;		/* User id */
463 	uint32_t	cd_gid;		/* Owner group id */
464 	uint32_t	cd_perms;	/* Permission bits */
465 	uint32_t	cd_maxev;	/* Max number of events */
466 	uint32_t	cd_evhwm;	/* High watermark of main event queue */
467 	uint32_t	cd_nevents;	/* current no of events in main ev q */
468 	uint32_t	cd_maxsub;	/* Max number of subscriptions */
469 	uint32_t	cd_nsub;	/* Current number of subscriptions */
470 	uint32_t	cd_maxbinds;	/* Max number of binds */
471 	uint32_t	cd_nbinds;	/* Current number of binds */
472 	uint32_t	cd_holdpend;	/* != 0 when HOLDPEND mode is set */
473 	uint32_t	cd_limev;	/* Limit of events per channel */
474 	sev_subinfo_t	cd_subinfo[1];	/* Per subscriber data */
475 } sev_chinfo_t;
476 
477 /*
478  * Project private flags for sysevent_evc_subscribe. Bits 0 to 7 are reserved
479  * for the consolidation private interface.
480  */
481 #define	EVCH_SUB_DUMP		0x0100
482 
483 /*
484  * Permission flags
485  */
486 #define	EVCH_PUB		0x0004	/* wants to publish events */
487 #define	EVCH_SUB		0x0008	/* wants to subscribe to channel */
488 
489 #define	EVCH_SUBU		0x0001	/* Subscribing allowed for uid */
490 #define	EVCH_PUBU		0x0002	/* Publishing allowed for uid */
491 #define	EVCH_PSUSR		0x0003	/* EVCH_SUBU + EVCH_PUBU */
492 #define	EVCH_SUBG		0x0004	/* Subscribing allowed for gid */
493 #define	EVCH_PUBG		0x0008	/* Publishing allowed for gid */
494 #define	EVCH_PSGRP		0x000C	/* EVCH_SUBG + EVCH_PUBG */
495 #define	EVCH_SUBO		0x0010	/* Subscribing allowed to all users */
496 #define	EVCH_PUBO		0x0020	/* Publishing allowed to all users */
497 #define	EVCH_PSOTH		0x0030	/* EVCH_SUBO + EVCH_PUBO */
498 #define	EVCH_PSALL		0x003f	/* Mask of all permission bits */
499 
500 /*
501  * Sysevent driver ioctls
502  */
503 #define	SEV_BASE		0x53455600
504 #define	SEV_PUBLISH		SEV_BASE | 0x01
505 #define	SEV_CHAN_OPEN		SEV_BASE | 0x02
506 #define	SEV_CHAN_CONTROL	SEV_BASE | 0x03
507 #define	SEV_SUBSCRIBE		SEV_BASE | 0x04
508 #define	SEV_UNSUBSCRIBE		SEV_BASE | 0x05
509 #define	SEV_CHANNAMES		SEV_BASE | 0x06
510 #define	SEV_CHANDATA		SEV_BASE | 0x07
511 
512 #define	DEVSYSEVENT	"/dev/sysevent"
513 #define	DEVICESYSEVENT	"/devices/pseudo/sysevent@0:sysevent"
514 
515 /*
516  * Maximum allowed binding handles
517  * It's a limit required by bitmap algorithm design (see sys/bitmap.h).
518  * Use pack(4) to make sizeof structs be the same on x86 and amd64.
519  */
520 #define	SYSEVENT_MINOR_MAX	SHRT_MAX
521 
522 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
523 #pragma pack(4)
524 #endif
525 
526 /* copyin/copyout data */
527 typedef struct box {
528 	uint64_t name;		/* pointer to something */
529 	uint32_t len;
530 } sev_box_t;
531 
532 typedef struct bind_args {
533 	sev_box_t chan_name;
534 	uint32_t flags;
535 } sev_bind_args_t;
536 
537 typedef struct control_args {
538 	uint32_t cmd;
539 	uint32_t value;
540 } sev_control_args_t;
541 
542 typedef struct publish_args {
543 	sev_box_t ev;
544 	uint32_t flags;
545 } sev_publish_args_t;
546 
547 typedef struct subscribe_args {
548 	sev_box_t sid;
549 	sev_box_t class_info;
550 	int door_desc;
551 	uint32_t flags;
552 } sev_subscribe_args_t;
553 
554 typedef struct unsubscribe_args {
555 	sev_box_t sid;
556 } sev_unsubscribe_args_t;
557 
558 typedef struct chandata {
559 	sev_box_t in_data;
560 	sev_box_t out_data;
561 } sev_chandata_args_t;
562 
563 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
564 #pragma pack()
565 #endif
566 
567 #ifdef	__cplusplus
568 }
569 #endif
570 
571 #endif	/* _SYS_SYSEVENT_IMPL_H */
572