source: mainline/kernel/generic/src/ipc/sysipc.c@ 7918fce

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 7918fce was 7918fce, checked in by Jakub Jermar <jakub@…>, 18 years ago

Implement a new mechanism for copying data between two address spaces based on
IPC. New system method IPC_M_DATA_SEND is introduced. The implementation is
generic and does not make use of any possible architecture optimizations such as
direct copy from one address space to another.
  • Property mode set to 100644
File size: 19.4 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 is_system_method(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 is_forwardable(unative_t method)
90{
91 switch (method) {
92 case IPC_M_PHONE_HUNGUP:
93 case IPC_M_AS_AREA_SEND:
94 case IPC_M_AS_AREA_RECV:
95 case IPC_M_DATA_SEND:
96 /* This message is meant only for the original recipient. */
97 return 0;
98 default:
99 return 1;
100 }
101}
102
103
104/***********************************************************************
105 * Functions that preprocess answer before sending it to the recepient.
106 ***********************************************************************/
107
108/** Decide if the caller (e.g. ipc_answer()) should save the old call contents
109 * for answer_preprocess().
110 *
111 * @param call Call structure to be decided.
112 *
113 * @return Return 1 if the old call contents should be saved.
114 * Return 0 otherwise.
115 */
116static inline int answer_need_old(call_t *call)
117{
118 switch (IPC_GET_METHOD(call->data)) {
119 case IPC_M_CONNECT_TO_ME:
120 case IPC_M_CONNECT_ME_TO:
121 case IPC_M_AS_AREA_SEND:
122 case IPC_M_AS_AREA_RECV:
123 case IPC_M_DATA_SEND:
124 return 1;
125 default:
126 return 0;
127 }
128}
129
130/** Interpret process answer as control information.
131 *
132 * This function is called directly after sys_ipc_answer().
133 *
134 * @param answer Call structure with the answer.
135 * @param olddata Saved data of the request.
136 *
137 * @return Return 0 on success or an error code.
138 */
139static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
140{
141 int phoneid;
142
143 if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
144 /* In case of forward, hangup the forwared phone,
145 * not the originator
146 */
147 spinlock_lock(&answer->data.phone->lock);
148 spinlock_lock(&TASK->answerbox.lock);
149 if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
150 list_remove(&answer->data.phone->link);
151 answer->data.phone->state = IPC_PHONE_SLAMMED;
152 }
153 spinlock_unlock(&TASK->answerbox.lock);
154 spinlock_unlock(&answer->data.phone->lock);
155 }
156
157 if (!olddata)
158 return 0;
159
160 if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
161 phoneid = IPC_GET_ARG3(*olddata);
162 if (IPC_GET_RETVAL(answer->data)) {
163 /* The connection was not accepted */
164 phone_dealloc(phoneid);
165 } else {
166 /* The connection was accepted */
167 phone_connect(phoneid, &answer->sender->answerbox);
168 /* Set 'phone hash' as arg3 of response */
169 IPC_SET_ARG3(answer->data,
170 (unative_t) &TASK->phones[phoneid]);
171 }
172 } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
173 /* If the users accepted call, connect */
174 if (!IPC_GET_RETVAL(answer->data)) {
175 ipc_phone_connect((phone_t *) IPC_GET_ARG3(*olddata),
176 &TASK->answerbox);
177 }
178 } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
179 if (!IPC_GET_RETVAL(answer->data)) {
180 /* Accepted, handle as_area receipt */
181 ipl_t ipl;
182 int rc;
183 as_t *as;
184
185 ipl = interrupts_disable();
186 spinlock_lock(&answer->sender->lock);
187 as = answer->sender->as;
188 spinlock_unlock(&answer->sender->lock);
189 interrupts_restore(ipl);
190
191 rc = as_area_share(as, IPC_GET_ARG1(*olddata),
192 IPC_GET_ARG2(*olddata), AS,
193 IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
194 IPC_SET_RETVAL(answer->data, rc);
195 return rc;
196 }
197 } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
198 if (!IPC_GET_RETVAL(answer->data)) {
199 ipl_t ipl;
200 as_t *as;
201 int rc;
202
203 ipl = interrupts_disable();
204 spinlock_lock(&answer->sender->lock);
205 as = answer->sender->as;
206 spinlock_unlock(&answer->sender->lock);
207 interrupts_restore(ipl);
208
209 rc = as_area_share(AS, IPC_GET_ARG1(answer->data),
210 IPC_GET_ARG2(*olddata), as, IPC_GET_ARG1(*olddata),
211 IPC_GET_ARG2(answer->data));
212 IPC_SET_RETVAL(answer->data, rc);
213 }
214 } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_SEND) {
215 if (!IPC_GET_RETVAL(answer->data)) {
216 int rc;
217 uintptr_t dst;
218 uintptr_t size;
219
220 ASSERT(answer->buffer);
221
222 dst = IPC_GET_ARG1(answer->data);
223 size = IPC_GET_ARG3(answer->data);
224
225 rc = copy_to_uspace((void *) dst, answer->buffer, size);
226 if (rc != 0)
227 IPC_SET_RETVAL(answer->data, rc);
228 free(answer->buffer);
229 answer->buffer = NULL;
230 }
231 }
232 return 0;
233}
234
235/** Called before the request is sent.
236 *
237 * @param call Call structure with the request.
238 *
239 * @return Return 0 on success, ELIMIT or EPERM on error.
240 */
241static int request_preprocess(call_t *call)
242{
243 int newphid;
244 size_t size;
245 uintptr_t src;
246 int rc;
247
248 switch (IPC_GET_METHOD(call->data)) {
249 case IPC_M_CONNECT_ME_TO:
250 newphid = phone_alloc();
251 if (newphid < 0)
252 return ELIMIT;
253 /* Set arg3 for server */
254 IPC_SET_ARG3(call->data, (unative_t) &TASK->phones[newphid]);
255 call->flags |= IPC_CALL_CONN_ME_TO;
256 call->priv = newphid;
257 break;
258 case IPC_M_AS_AREA_SEND:
259 size = as_get_size(IPC_GET_ARG1(call->data));
260 if (!size)
261 return EPERM;
262 IPC_SET_ARG2(call->data, size);
263 break;
264 case IPC_M_DATA_SEND:
265 src = IPC_GET_ARG2(call->data);
266 size = IPC_GET_ARG3(call->data);
267
268 if ((size <= 0) || (size > DATA_SEND_LIMIT))
269 return ELIMIT;
270
271 call->buffer = (uint8_t *) malloc(size, 0);
272 rc = copy_from_uspace(call->buffer, (void *) src, size);
273 if (rc != 0) {
274 free(call->buffer);
275 return rc;
276 }
277 break;
278 default:
279 break;
280 }
281 return 0;
282}
283
284/*******************************************************************************
285 * Functions called to process received call/answer before passing it to uspace.
286 *******************************************************************************/
287
288/** Do basic kernel processing of received call answer.
289 *
290 * @param call Call structure with the answer.
291 */
292static void process_answer(call_t *call)
293{
294 if (IPC_GET_RETVAL(call->data) == EHANGUP &&
295 (call->flags & IPC_CALL_FORWARDED))
296 IPC_SET_RETVAL(call->data, EFORWARD);
297
298 if (call->flags & IPC_CALL_CONN_ME_TO) {
299 if (IPC_GET_RETVAL(call->data))
300 phone_dealloc(call->priv);
301 else
302 IPC_SET_ARG3(call->data, call->priv);
303 }
304}
305
306/** Do basic kernel processing of received call request.
307 *
308 * @param box Destination answerbox structure.
309 * @param call Call structure with the request.
310 *
311 * @return Return 0 if the call should be passed to userspace.
312 * Return -1 if the call should be ignored.
313 */
314static int process_request(answerbox_t *box, call_t *call)
315{
316 int phoneid;
317
318 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
319 phoneid = phone_alloc();
320 if (phoneid < 0) { /* Failed to allocate phone */
321 IPC_SET_RETVAL(call->data, ELIMIT);
322 ipc_answer(box, call);
323 return -1;
324 }
325 IPC_SET_ARG3(call->data, phoneid);
326 }
327 return 0;
328}
329
330/** Make a fast call over IPC, wait for reply and return to user.
331 *
332 * This function can handle only one argument of payload, but is faster than
333 * the generic function (i.e. sys_ipc_call_sync()).
334 *
335 * @param phoneid Phone handle for the call.
336 * @param method Method of the call.
337 * @param arg1 Service-defined payload argument.
338 * @param data Address of userspace structure where the reply call will
339 * be stored.
340 *
341 * @return Returns 0 on success.
342 * Return ENOENT if there is no such phone handle.
343 */
344unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
345 unative_t arg1, ipc_data_t *data)
346{
347 call_t call;
348 phone_t *phone;
349 int res;
350
351 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
352
353 ipc_call_static_init(&call);
354 IPC_SET_METHOD(call.data, method);
355 IPC_SET_ARG1(call.data, arg1);
356
357 if (!(res = request_preprocess(&call))) {
358 ipc_call_sync(phone, &call);
359 process_answer(&call);
360 } else {
361 IPC_SET_RETVAL(call.data, res);
362 }
363 STRUCT_TO_USPACE(&data->args, &call.data.args);
364
365 return 0;
366}
367
368/** Make a synchronous IPC call allowing to transmit the entire payload.
369 *
370 * @param phoneid Phone handle for the call.
371 * @param question Userspace address of call data with the request.
372 * @param reply Userspace address of call data where to store the
373 * answer.
374 *
375 * @return Zero on success or an error code.
376 */
377unative_t sys_ipc_call_sync(unative_t phoneid, ipc_data_t *question,
378 ipc_data_t *reply)
379{
380 call_t call;
381 phone_t *phone;
382 int res;
383 int rc;
384
385 ipc_call_static_init(&call);
386 rc = copy_from_uspace(&call.data.args, &question->args,
387 sizeof(call.data.args));
388 if (rc != 0)
389 return (unative_t) rc;
390
391 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
392
393 if (!(res = request_preprocess(&call))) {
394 ipc_call_sync(phone, &call);
395 process_answer(&call);
396 } else
397 IPC_SET_RETVAL(call.data, res);
398
399 rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
400 if (rc != 0)
401 return rc;
402
403 return 0;
404}
405
406/** Check that the task did not exceed the allowed limit of asynchronous calls.
407 *
408 * @return Return 0 if limit not reached or -1 if limit exceeded.
409 */
410static int check_call_limit(void)
411{
412 if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
413 atomic_dec(&TASK->active_calls);
414 return -1;
415 }
416 return 0;
417}
418
419/** Make a fast asynchronous call over IPC.
420 *
421 * This function can only handle two arguments of payload, but is faster than
422 * the generic function sys_ipc_call_async().
423 *
424 * @param phoneid Phone handle for the call.
425 * @param method Method of the call.
426 * @param arg1 Service-defined payload argument.
427 * @param arg2 Service-defined payload argument.
428 *
429 * @return Return call hash on success.
430 * Return IPC_CALLRET_FATAL in case of a fatal error and
431 * IPC_CALLRET_TEMPORARY if there are too many pending
432 * asynchronous requests; answers should be handled first.
433 */
434unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
435 unative_t arg1, unative_t arg2)
436{
437 call_t *call;
438 phone_t *phone;
439 int res;
440
441 if (check_call_limit())
442 return IPC_CALLRET_TEMPORARY;
443
444 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
445
446 call = ipc_call_alloc(0);
447 IPC_SET_METHOD(call->data, method);
448 IPC_SET_ARG1(call->data, arg1);
449 IPC_SET_ARG2(call->data, arg2);
450 IPC_SET_ARG3(call->data, 0);
451
452 if (!(res = request_preprocess(call)))
453 ipc_call(phone, call);
454 else
455 ipc_backsend_err(phone, call, res);
456
457 return (unative_t) call;
458}
459
460/** Make an asynchronous IPC call allowing to transmit the entire payload.
461 *
462 * @param phoneid Phone handle for the call.
463 * @param data Userspace address of call data with the request.
464 *
465 * @return See sys_ipc_call_async_fast().
466 */
467unative_t sys_ipc_call_async(unative_t phoneid, ipc_data_t *data)
468{
469 call_t *call;
470 phone_t *phone;
471 int res;
472 int rc;
473
474 if (check_call_limit())
475 return IPC_CALLRET_TEMPORARY;
476
477 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
478
479 call = ipc_call_alloc(0);
480 rc = copy_from_uspace(&call->data.args, &data->args,
481 sizeof(call->data.args));
482 if (rc != 0) {
483 ipc_call_free(call);
484 return (unative_t) rc;
485 }
486 if (!(res = request_preprocess(call)))
487 ipc_call(phone, call);
488 else
489 ipc_backsend_err(phone, call, res);
490
491 return (unative_t) call;
492}
493
494/** Forward a received call to another destination.
495 *
496 * @param callid Hash of the call to forward.
497 * @param phoneid Phone handle to use for forwarding.
498 * @param method New method to use for the forwarded call.
499 * @param arg1 New value of the first argument for the forwarded call.
500 *
501 * @return Return 0 on succes, otherwise return an error code.
502 *
503 * In case the original method is a system method, ARG1 and ARG2 are overwritten
504 * in the forwarded message with the new method and the new arg1, respectively.
505 * Otherwise the METHOD and ARG1 are rewritten with the new method and arg1,
506 * respectively.
507 *
508 * Warning: If implementing non-fast version, make sure that
509 * ARG3 is not rewritten for certain system IPC
510 */
511unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
512 unative_t method, unative_t arg1)
513{
514 call_t *call;
515 phone_t *phone;
516
517 call = get_call(callid);
518 if (!call)
519 return ENOENT;
520
521 call->flags |= IPC_CALL_FORWARDED;
522
523 GET_CHECK_PHONE(phone, phoneid, {
524 IPC_SET_RETVAL(call->data, EFORWARD);
525 ipc_answer(&TASK->answerbox, call);
526 return ENOENT;
527 });
528
529 if (!is_forwardable(IPC_GET_METHOD(call->data))) {
530 IPC_SET_RETVAL(call->data, EFORWARD);
531 ipc_answer(&TASK->answerbox, call);
532 return EPERM;
533 }
534
535 /* Userspace is not allowed to change method of system methods
536 * on forward, allow changing ARG1 and ARG2 by means of method and arg1
537 */
538 if (is_system_method(IPC_GET_METHOD(call->data))) {
539 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
540 phone_dealloc(IPC_GET_ARG3(call->data));
541
542 IPC_SET_ARG1(call->data, method);
543 IPC_SET_ARG2(call->data, arg1);
544 } else {
545 IPC_SET_METHOD(call->data, method);
546 IPC_SET_ARG1(call->data, arg1);
547 }
548
549 return ipc_forward(call, phone, &TASK->answerbox);
550}
551
552/** Answer an IPC call - fast version.
553 *
554 * This function can handle only two return arguments of payload, but is faster
555 * than the generic sys_ipc_answer().
556 *
557 * @param callid Hash of the call to be answered.
558 * @param retval Return value of the answer.
559 * @param arg1 Service-defined return value.
560 * @param arg2 Service-defined return value.
561 *
562 * @return Return 0 on success, otherwise return an error code.
563 */
564unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
565 unative_t arg1, unative_t arg2)
566{
567 call_t *call;
568 ipc_data_t saved_data;
569 int saveddata = 0;
570 int rc;
571
572 /* Do not answer notification callids */
573 if (callid & IPC_CALLID_NOTIFICATION)
574 return 0;
575
576 call = get_call(callid);
577 if (!call)
578 return ENOENT;
579
580 if (answer_need_old(call)) {
581 memcpy(&saved_data, &call->data, sizeof(call->data));
582 saveddata = 1;
583 }
584
585 IPC_SET_RETVAL(call->data, retval);
586 IPC_SET_ARG1(call->data, arg1);
587 IPC_SET_ARG2(call->data, arg2);
588 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
589
590 ipc_answer(&TASK->answerbox, call);
591 return rc;
592}
593
594/** Answer an IPC call.
595 *
596 * @param callid Hash of the call to be answered.
597 * @param data Userspace address of call data with the answer.
598 *
599 * @return Return 0 on success, otherwise return an error code.
600 */
601unative_t sys_ipc_answer(unative_t callid, ipc_data_t *data)
602{
603 call_t *call;
604 ipc_data_t saved_data;
605 int saveddata = 0;
606 int rc;
607
608 /* Do not answer notification callids */
609 if (callid & IPC_CALLID_NOTIFICATION)
610 return 0;
611
612 call = get_call(callid);
613 if (!call)
614 return ENOENT;
615
616 if (answer_need_old(call)) {
617 memcpy(&saved_data, &call->data, sizeof(call->data));
618 saveddata = 1;
619 }
620 rc = copy_from_uspace(&call->data.args, &data->args,
621 sizeof(call->data.args));
622 if (rc != 0)
623 return rc;
624
625 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
626
627 ipc_answer(&TASK->answerbox, call);
628
629 return rc;
630}
631
632/** Hang up a phone.
633 *
634 * @param Phone handle of the phone to be hung up.
635 *
636 * @return Return 0 on success or an error code.
637 */
638unative_t sys_ipc_hangup(int phoneid)
639{
640 phone_t *phone;
641
642 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
643
644 if (ipc_phone_hangup(phone))
645 return -1;
646
647 return 0;
648}
649
650/** Wait for an incoming IPC call or an answer.
651 *
652 * @param calldata Pointer to buffer where the call/answer data is stored.
653 * @param usec Timeout. See waitq_sleep_timeout() for explanation.
654 * @param flags Select mode of sleep operation. See waitq_sleep_timeout()
655 * for explanation.
656 *
657 * @return Hash of the call.
658 * If IPC_CALLID_NOTIFICATION bit is set in the hash, the
659 * call is a notification. IPC_CALLID_ANSWERED denotes an
660 * answer.
661 */
662unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
663{
664 call_t *call;
665
666restart:
667 call = ipc_wait_for_call(&TASK->answerbox, usec,
668 flags | SYNCH_FLAGS_INTERRUPTIBLE);
669 if (!call)
670 return 0;
671
672 if (call->flags & IPC_CALL_NOTIF) {
673 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
674
675 /* Set in_phone_hash to the interrupt counter */
676 call->data.phone = (void *) call->priv;
677
678 STRUCT_TO_USPACE(calldata, &call->data);
679
680 ipc_call_free(call);
681
682 return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
683 }
684
685 if (call->flags & IPC_CALL_ANSWERED) {
686 process_answer(call);
687
688 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
689
690 atomic_dec(&TASK->active_calls);
691
692 if (call->flags & IPC_CALL_DISCARD_ANSWER) {
693 ipc_call_free(call);
694 goto restart;
695 }
696
697 STRUCT_TO_USPACE(&calldata->args, &call->data.args);
698 ipc_call_free(call);
699
700 return ((unative_t) call) | IPC_CALLID_ANSWERED;
701 }
702
703 if (process_request(&TASK->answerbox, call))
704 goto restart;
705
706 /* Include phone address('id') of the caller in the request,
707 * copy whole call->data, not only call->data.args */
708 if (STRUCT_TO_USPACE(calldata, &call->data)) {
709 return 0;
710 }
711 return (unative_t)call;
712}
713
714/** Connect an IRQ handler to a task.
715 *
716 * @param inr IRQ number.
717 * @param devno Device number.
718 * @param method Method to be associated with the notification.
719 * @param ucode Uspace pointer to the top-half pseudocode.
720 *
721 * @return EPERM or a return code returned by ipc_irq_register().
722 */
723unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
724 irq_code_t *ucode)
725{
726 if (!(cap_get(TASK) & CAP_IRQ_REG))
727 return EPERM;
728
729 return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
730}
731
732/** Disconnect an IRQ handler from a task.
733 *
734 * @param inr IRQ number.
735 * @param devno Device number.
736 *
737 * @return Zero on success or EPERM on error..
738 */
739unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
740{
741 if (!(cap_get(TASK) & CAP_IRQ_REG))
742 return EPERM;
743
744 ipc_irq_unregister(&TASK->answerbox, inr, devno);
745
746 return 0;
747}
748
749/** @}
750 */
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