source: mainline/kernel/generic/src/ipc/sysipc.c@ 7c5bcc0

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 7c5bcc0 was 7c5bcc0, checked in by Jakub Jermar <jakub@…>, 18 years ago

Fix and improve two IPC related comments.
  • Property mode set to 100644
File size: 20.1 KB
Line 
1/*
2 * Copyright (c) 2006 Ondrej Palkovsky
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup genericipc
30 * @{
31 */
32/** @file
33 */
34
35#include <arch.h>
36#include <proc/task.h>
37#include <proc/thread.h>
38#include <errno.h>
39#include <memstr.h>
40#include <debug.h>
41#include <ipc/ipc.h>
42#include <ipc/sysipc.h>
43#include <ipc/irq.h>
44#include <ipc/ipcrsc.h>
45#include <arch/interrupt.h>
46#include <print.h>
47#include <syscall/copy.h>
48#include <security/cap.h>
49#include <mm/as.h>
50#include <print.h>
51
52/** Maximum buffer size allowed for IPC_M_DATA_SEND requests. */
53#define DATA_SEND_LIMIT (64 * 1024)
54
55#define GET_CHECK_PHONE(phone, phoneid, err) \
56{ \
57 if (phoneid > IPC_MAX_PHONES) { \
58 err; \
59 } \
60 phone = &TASK->phones[phoneid]; \
61}
62
63#define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src)))
64
65/** Decide if the method is a system method.
66 *
67 * @param method Method to be decided.
68 *
69 * @return Return 1 if the method is a system method.
70 * Otherwise return 0.
71 */
72static inline int method_is_system(unative_t method)
73{
74 if (method <= IPC_M_LAST_SYSTEM)
75 return 1;
76 return 0;
77}
78
79/** Decide if the message with this method is forwardable.
80 *
81 * - some system messages may be forwarded, for some of them
82 * it is useless
83 *
84 * @param method Method to be decided.
85 *
86 * @return Return 1 if the method is forwardable.
87 * Otherwise return 0.
88 */
89static inline int method_is_forwardable(unative_t method)
90{
91 switch (method) {
92 case IPC_M_PHONE_HUNGUP:
93 /* This message is meant only for the original recipient. */
94 return 0;
95 default:
96 return 1;
97 }
98}
99
100/** Decide if the message with this method is immutable on forward.
101 *
102 * - some system messages may be forwarded but their content cannot be altered
103 *
104 * @param method Method to be decided.
105 *
106 * @return Return 1 if the method is immutable on forward.
107 * Otherwise return 0.
108 */
109static inline int method_is_immutable(unative_t method)
110{
111 switch (method) {
112 case IPC_M_AS_AREA_SEND:
113 case IPC_M_AS_AREA_RECV:
114 case IPC_M_DATA_SEND:
115 return 1;
116 break;
117 default:
118 return 0;
119 }
120}
121
122
123/***********************************************************************
124 * Functions that preprocess answer before sending it to the recepient.
125 ***********************************************************************/
126
127/** Decide if the caller (e.g. ipc_answer()) should save the old call contents
128 * for answer_preprocess().
129 *
130 * @param call Call structure to be decided.
131 *
132 * @return Return 1 if the old call contents should be saved.
133 * Return 0 otherwise.
134 */
135static inline int answer_need_old(call_t *call)
136{
137 switch (IPC_GET_METHOD(call->data)) {
138 case IPC_M_CONNECT_TO_ME:
139 case IPC_M_CONNECT_ME_TO:
140 case IPC_M_AS_AREA_SEND:
141 case IPC_M_AS_AREA_RECV:
142 case IPC_M_DATA_SEND:
143 return 1;
144 default:
145 return 0;
146 }
147}
148
149/** Interpret process answer as control information.
150 *
151 * This function is called directly after sys_ipc_answer().
152 *
153 * @param answer Call structure with the answer.
154 * @param olddata Saved data of the request.
155 *
156 * @return Return 0 on success or an error code.
157 */
158static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
159{
160 int phoneid;
161
162 if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
163 /* In case of forward, hangup the forwared phone,
164 * not the originator
165 */
166 spinlock_lock(&answer->data.phone->lock);
167 spinlock_lock(&TASK->answerbox.lock);
168 if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
169 list_remove(&answer->data.phone->link);
170 answer->data.phone->state = IPC_PHONE_SLAMMED;
171 }
172 spinlock_unlock(&TASK->answerbox.lock);
173 spinlock_unlock(&answer->data.phone->lock);
174 }
175
176 if (!olddata)
177 return 0;
178
179 if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
180 phoneid = IPC_GET_ARG3(*olddata);
181 if (IPC_GET_RETVAL(answer->data)) {
182 /* The connection was not accepted */
183 phone_dealloc(phoneid);
184 } else {
185 /* The connection was accepted */
186 phone_connect(phoneid, &answer->sender->answerbox);
187 /* Set 'phone hash' as arg3 of response */
188 IPC_SET_ARG3(answer->data,
189 (unative_t) &TASK->phones[phoneid]);
190 }
191 } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
192 /* If the users accepted call, connect */
193 if (!IPC_GET_RETVAL(answer->data)) {
194 ipc_phone_connect((phone_t *) IPC_GET_ARG3(*olddata),
195 &TASK->answerbox);
196 }
197 } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
198 if (!IPC_GET_RETVAL(answer->data)) {
199 /* Accepted, handle as_area receipt */
200 ipl_t ipl;
201 int rc;
202 as_t *as;
203
204 ipl = interrupts_disable();
205 spinlock_lock(&answer->sender->lock);
206 as = answer->sender->as;
207 spinlock_unlock(&answer->sender->lock);
208 interrupts_restore(ipl);
209
210 rc = as_area_share(as, IPC_GET_ARG1(*olddata),
211 IPC_GET_ARG2(*olddata), AS,
212 IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
213 IPC_SET_RETVAL(answer->data, rc);
214 return rc;
215 }
216 } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
217 if (!IPC_GET_RETVAL(answer->data)) {
218 ipl_t ipl;
219 as_t *as;
220 int rc;
221
222 ipl = interrupts_disable();
223 spinlock_lock(&answer->sender->lock);
224 as = answer->sender->as;
225 spinlock_unlock(&answer->sender->lock);
226 interrupts_restore(ipl);
227
228 rc = as_area_share(AS, IPC_GET_ARG1(answer->data),
229 IPC_GET_ARG2(*olddata), as, IPC_GET_ARG1(*olddata),
230 IPC_GET_ARG2(answer->data));
231 IPC_SET_RETVAL(answer->data, rc);
232 }
233 } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_SEND) {
234 if (!IPC_GET_RETVAL(answer->data)) {
235 int rc;
236 uintptr_t dst;
237 uintptr_t size;
238
239 ASSERT(answer->buffer);
240
241 dst = IPC_GET_ARG1(answer->data);
242 size = IPC_GET_ARG3(answer->data);
243
244 rc = copy_to_uspace((void *) dst, answer->buffer, size);
245 if (rc != 0)
246 IPC_SET_RETVAL(answer->data, rc);
247 free(answer->buffer);
248 answer->buffer = NULL;
249 }
250 }
251 return 0;
252}
253
254/** Called before the request is sent.
255 *
256 * @param call Call structure with the request.
257 *
258 * @return Return 0 on success, ELIMIT or EPERM on error.
259 */
260static int request_preprocess(call_t *call)
261{
262 int newphid;
263 size_t size;
264 uintptr_t src;
265 int rc;
266
267 switch (IPC_GET_METHOD(call->data)) {
268 case IPC_M_CONNECT_ME_TO:
269 newphid = phone_alloc();
270 if (newphid < 0)
271 return ELIMIT;
272 /* Set arg3 for server */
273 IPC_SET_ARG3(call->data, (unative_t) &TASK->phones[newphid]);
274 call->flags |= IPC_CALL_CONN_ME_TO;
275 call->priv = newphid;
276 break;
277 case IPC_M_AS_AREA_SEND:
278 size = as_area_get_size(IPC_GET_ARG1(call->data));
279 if (!size)
280 return EPERM;
281 IPC_SET_ARG2(call->data, size);
282 break;
283 case IPC_M_DATA_SEND:
284 src = IPC_GET_ARG2(call->data);
285 size = IPC_GET_ARG3(call->data);
286
287 if ((size <= 0) || (size > DATA_SEND_LIMIT))
288 return ELIMIT;
289
290 call->buffer = (uint8_t *) malloc(size, 0);
291 rc = copy_from_uspace(call->buffer, (void *) src, size);
292 if (rc != 0) {
293 free(call->buffer);
294 return rc;
295 }
296 break;
297 default:
298 break;
299 }
300 return 0;
301}
302
303/*******************************************************************************
304 * Functions called to process received call/answer before passing it to uspace.
305 *******************************************************************************/
306
307/** Do basic kernel processing of received call answer.
308 *
309 * @param call Call structure with the answer.
310 */
311static void process_answer(call_t *call)
312{
313 if (IPC_GET_RETVAL(call->data) == EHANGUP &&
314 (call->flags & IPC_CALL_FORWARDED))
315 IPC_SET_RETVAL(call->data, EFORWARD);
316
317 if (call->flags & IPC_CALL_CONN_ME_TO) {
318 if (IPC_GET_RETVAL(call->data))
319 phone_dealloc(call->priv);
320 else
321 IPC_SET_ARG3(call->data, call->priv);
322 }
323}
324
325/** Do basic kernel processing of received call request.
326 *
327 * @param box Destination answerbox structure.
328 * @param call Call structure with the request.
329 *
330 * @return Return 0 if the call should be passed to userspace.
331 * Return -1 if the call should be ignored.
332 */
333static int process_request(answerbox_t *box, call_t *call)
334{
335 int phoneid;
336
337 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
338 phoneid = phone_alloc();
339 if (phoneid < 0) { /* Failed to allocate phone */
340 IPC_SET_RETVAL(call->data, ELIMIT);
341 ipc_answer(box, call);
342 return -1;
343 }
344 IPC_SET_ARG3(call->data, phoneid);
345 }
346 return 0;
347}
348
349/** Make a fast call over IPC, wait for reply and return to user.
350 *
351 * This function can handle only one argument of payload, but is faster than
352 * the generic function (i.e. sys_ipc_call_sync()).
353 *
354 * @param phoneid Phone handle for the call.
355 * @param method Method of the call.
356 * @param arg1 Service-defined payload argument.
357 * @param data Address of userspace structure where the reply call will
358 * be stored.
359 *
360 * @return Returns 0 on success.
361 * Return ENOENT if there is no such phone handle.
362 */
363unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
364 unative_t arg1, ipc_data_t *data)
365{
366 call_t call;
367 phone_t *phone;
368 int res;
369
370 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
371
372 ipc_call_static_init(&call);
373 IPC_SET_METHOD(call.data, method);
374 IPC_SET_ARG1(call.data, arg1);
375
376 if (!(res = request_preprocess(&call))) {
377 ipc_call_sync(phone, &call);
378 process_answer(&call);
379 } else {
380 IPC_SET_RETVAL(call.data, res);
381 }
382 STRUCT_TO_USPACE(&data->args, &call.data.args);
383
384 return 0;
385}
386
387/** Make a synchronous IPC call allowing to transmit the entire payload.
388 *
389 * @param phoneid Phone handle for the call.
390 * @param question Userspace address of call data with the request.
391 * @param reply Userspace address of call data where to store the
392 * answer.
393 *
394 * @return Zero on success or an error code.
395 */
396unative_t sys_ipc_call_sync(unative_t phoneid, ipc_data_t *question,
397 ipc_data_t *reply)
398{
399 call_t call;
400 phone_t *phone;
401 int res;
402 int rc;
403
404 ipc_call_static_init(&call);
405 rc = copy_from_uspace(&call.data.args, &question->args,
406 sizeof(call.data.args));
407 if (rc != 0)
408 return (unative_t) rc;
409
410 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
411
412 if (!(res = request_preprocess(&call))) {
413 ipc_call_sync(phone, &call);
414 process_answer(&call);
415 } else
416 IPC_SET_RETVAL(call.data, res);
417
418 rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
419 if (rc != 0)
420 return rc;
421
422 return 0;
423}
424
425/** Check that the task did not exceed the allowed limit of asynchronous calls.
426 *
427 * @return Return 0 if limit not reached or -1 if limit exceeded.
428 */
429static int check_call_limit(void)
430{
431 if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
432 atomic_dec(&TASK->active_calls);
433 return -1;
434 }
435 return 0;
436}
437
438/** Make a fast asynchronous call over IPC.
439 *
440 * This function can only handle two arguments of payload, but is faster than
441 * the generic function sys_ipc_call_async().
442 *
443 * @param phoneid Phone handle for the call.
444 * @param method Method of the call.
445 * @param arg1 Service-defined payload argument.
446 * @param arg2 Service-defined payload argument.
447 *
448 * @return Return call hash on success.
449 * Return IPC_CALLRET_FATAL in case of a fatal error and
450 * IPC_CALLRET_TEMPORARY if there are too many pending
451 * asynchronous requests; answers should be handled first.
452 */
453unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
454 unative_t arg1, unative_t arg2)
455{
456 call_t *call;
457 phone_t *phone;
458 int res;
459
460 if (check_call_limit())
461 return IPC_CALLRET_TEMPORARY;
462
463 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
464
465 call = ipc_call_alloc(0);
466 IPC_SET_METHOD(call->data, method);
467 IPC_SET_ARG1(call->data, arg1);
468 IPC_SET_ARG2(call->data, arg2);
469 IPC_SET_ARG3(call->data, 0);
470
471 if (!(res = request_preprocess(call)))
472 ipc_call(phone, call);
473 else
474 ipc_backsend_err(phone, call, res);
475
476 return (unative_t) call;
477}
478
479/** Make an asynchronous IPC call allowing to transmit the entire payload.
480 *
481 * @param phoneid Phone handle for the call.
482 * @param data Userspace address of call data with the request.
483 *
484 * @return See sys_ipc_call_async_fast().
485 */
486unative_t sys_ipc_call_async(unative_t phoneid, ipc_data_t *data)
487{
488 call_t *call;
489 phone_t *phone;
490 int res;
491 int rc;
492
493 if (check_call_limit())
494 return IPC_CALLRET_TEMPORARY;
495
496 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
497
498 call = ipc_call_alloc(0);
499 rc = copy_from_uspace(&call->data.args, &data->args,
500 sizeof(call->data.args));
501 if (rc != 0) {
502 ipc_call_free(call);
503 return (unative_t) rc;
504 }
505 if (!(res = request_preprocess(call)))
506 ipc_call(phone, call);
507 else
508 ipc_backsend_err(phone, call, res);
509
510 return (unative_t) call;
511}
512
513/** Forward a received call to another destination.
514 *
515 * @param callid Hash of the call to forward.
516 * @param phoneid Phone handle to use for forwarding.
517 * @param method New method to use for the forwarded call.
518 * @param arg1 New value of the first argument for the forwarded call.
519 *
520 * @return Return 0 on succes, otherwise return an error code.
521 *
522 * In case the original method is a system method, ARG1 and ARG2 are overwritten
523 * in the forwarded message with the new method and the new arg1, respectively.
524 * Otherwise the METHOD and ARG1 are rewritten with the new method and arg1,
525 * respectively. Also note there is a set of immutable methods, for which the
526 * new method and argument is not set and these values are ignored.
527 *
528 * Warning: If implementing non-fast version, make sure that
529 * ARG3 is not rewritten for certain system IPC
530 */
531unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
532 unative_t method, unative_t arg1)
533{
534 call_t *call;
535 phone_t *phone;
536
537 call = get_call(callid);
538 if (!call)
539 return ENOENT;
540
541 call->flags |= IPC_CALL_FORWARDED;
542
543 GET_CHECK_PHONE(phone, phoneid, {
544 IPC_SET_RETVAL(call->data, EFORWARD);
545 ipc_answer(&TASK->answerbox, call);
546 return ENOENT;
547 });
548
549 if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
550 IPC_SET_RETVAL(call->data, EFORWARD);
551 ipc_answer(&TASK->answerbox, call);
552 return EPERM;
553 }
554
555 /*
556 * Userspace is not allowed to change method of system methods on
557 * forward, allow changing ARG1 and ARG2 by means of method and arg1.
558 * If the method is immutable, don't change anything.
559 */
560 if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
561 if (method_is_system(IPC_GET_METHOD(call->data))) {
562 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
563 phone_dealloc(IPC_GET_ARG3(call->data));
564
565 IPC_SET_ARG1(call->data, method);
566 IPC_SET_ARG2(call->data, arg1);
567 } else {
568 IPC_SET_METHOD(call->data, method);
569 IPC_SET_ARG1(call->data, arg1);
570 }
571 }
572
573 return ipc_forward(call, phone, &TASK->answerbox);
574}
575
576/** Answer an IPC call - fast version.
577 *
578 * This function can handle only two return arguments of payload, but is faster
579 * than the generic sys_ipc_answer().
580 *
581 * @param callid Hash of the call to be answered.
582 * @param retval Return value of the answer.
583 * @param arg1 Service-defined return value.
584 * @param arg2 Service-defined return value.
585 *
586 * @return Return 0 on success, otherwise return an error code.
587 */
588unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
589 unative_t arg1, unative_t arg2)
590{
591 call_t *call;
592 ipc_data_t saved_data;
593 int saveddata = 0;
594 int rc;
595
596 /* Do not answer notification callids */
597 if (callid & IPC_CALLID_NOTIFICATION)
598 return 0;
599
600 call = get_call(callid);
601 if (!call)
602 return ENOENT;
603
604 if (answer_need_old(call)) {
605 memcpy(&saved_data, &call->data, sizeof(call->data));
606 saveddata = 1;
607 }
608
609 IPC_SET_RETVAL(call->data, retval);
610 IPC_SET_ARG1(call->data, arg1);
611 IPC_SET_ARG2(call->data, arg2);
612 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
613
614 ipc_answer(&TASK->answerbox, call);
615 return rc;
616}
617
618/** Answer an IPC call.
619 *
620 * @param callid Hash of the call to be answered.
621 * @param data Userspace address of call data with the answer.
622 *
623 * @return Return 0 on success, otherwise return an error code.
624 */
625unative_t sys_ipc_answer(unative_t callid, ipc_data_t *data)
626{
627 call_t *call;
628 ipc_data_t saved_data;
629 int saveddata = 0;
630 int rc;
631
632 /* Do not answer notification callids */
633 if (callid & IPC_CALLID_NOTIFICATION)
634 return 0;
635
636 call = get_call(callid);
637 if (!call)
638 return ENOENT;
639
640 if (answer_need_old(call)) {
641 memcpy(&saved_data, &call->data, sizeof(call->data));
642 saveddata = 1;
643 }
644 rc = copy_from_uspace(&call->data.args, &data->args,
645 sizeof(call->data.args));
646 if (rc != 0)
647 return rc;
648
649 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
650
651 ipc_answer(&TASK->answerbox, call);
652
653 return rc;
654}
655
656/** Hang up a phone.
657 *
658 * @param Phone handle of the phone to be hung up.
659 *
660 * @return Return 0 on success or an error code.
661 */
662unative_t sys_ipc_hangup(int phoneid)
663{
664 phone_t *phone;
665
666 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
667
668 if (ipc_phone_hangup(phone))
669 return -1;
670
671 return 0;
672}
673
674/** Wait for an incoming IPC call or an answer.
675 *
676 * @param calldata Pointer to buffer where the call/answer data is stored.
677 * @param usec Timeout. See waitq_sleep_timeout() for explanation.
678 * @param flags Select mode of sleep operation. See waitq_sleep_timeout()
679 * for explanation.
680 *
681 * @return Hash of the call.
682 * If IPC_CALLID_NOTIFICATION bit is set in the hash, the
683 * call is a notification. IPC_CALLID_ANSWERED denotes an
684 * answer.
685 */
686unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
687{
688 call_t *call;
689
690restart:
691 call = ipc_wait_for_call(&TASK->answerbox, usec,
692 flags | SYNCH_FLAGS_INTERRUPTIBLE);
693 if (!call)
694 return 0;
695
696 if (call->flags & IPC_CALL_NOTIF) {
697 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
698
699 /* Set in_phone_hash to the interrupt counter */
700 call->data.phone = (void *) call->priv;
701
702 STRUCT_TO_USPACE(calldata, &call->data);
703
704 ipc_call_free(call);
705
706 return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
707 }
708
709 if (call->flags & IPC_CALL_ANSWERED) {
710 process_answer(call);
711
712 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
713
714 atomic_dec(&TASK->active_calls);
715
716 if (call->flags & IPC_CALL_DISCARD_ANSWER) {
717 ipc_call_free(call);
718 goto restart;
719 }
720
721 STRUCT_TO_USPACE(&calldata->args, &call->data.args);
722 ipc_call_free(call);
723
724 return ((unative_t) call) | IPC_CALLID_ANSWERED;
725 }
726
727 if (process_request(&TASK->answerbox, call))
728 goto restart;
729
730 /* Include phone address('id') of the caller in the request,
731 * copy whole call->data, not only call->data.args */
732 if (STRUCT_TO_USPACE(calldata, &call->data)) {
733 return 0;
734 }
735 return (unative_t)call;
736}
737
738/** Connect an IRQ handler to a task.
739 *
740 * @param inr IRQ number.
741 * @param devno Device number.
742 * @param method Method to be associated with the notification.
743 * @param ucode Uspace pointer to the top-half pseudocode.
744 *
745 * @return EPERM or a return code returned by ipc_irq_register().
746 */
747unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
748 irq_code_t *ucode)
749{
750 if (!(cap_get(TASK) & CAP_IRQ_REG))
751 return EPERM;
752
753 return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
754}
755
756/** Disconnect an IRQ handler from a task.
757 *
758 * @param inr IRQ number.
759 * @param devno Device number.
760 *
761 * @return Zero on success or EPERM on error..
762 */
763unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
764{
765 if (!(cap_get(TASK) & CAP_IRQ_REG))
766 return EPERM;
767
768 ipc_irq_unregister(&TASK->answerbox, inr, devno);
769
770 return 0;
771}
772
773/** @}
774 */
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