source: mainline/kernel/generic/src/ipc/sysipc.c@ 0c09f2b

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 0c09f2b was 2e51969, checked in by Jakub Jermar <jakub@…>, 18 years ago

Modify synchronous IPC to make use of all six syscall arguments. The preferred
means of synchronous communication is now via the set of ipc_call_sync_m_n()
macros, where m is the number of payload arguments passed to the kernel and n is
the number of return values. These macros will automatically decide between the
fast and the universal slow version of ipc_call_sync.
  • Property mode set to 100644
File size: 20.3 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 three arguments of payload, but is faster than
352 * the generic function (i.e. sys_ipc_call_sync_slow()).
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 arg2 Service-defined payload argument.
358 * @param arg3 Service-defined payload argument.
359 * @param data Address of userspace structure where the reply call will
360 * be stored.
361 *
362 * @return Returns 0 on success.
363 * Return ENOENT if there is no such phone handle.
364 */
365unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
366 unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
367{
368 call_t call;
369 phone_t *phone;
370 int res;
371
372 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
373
374 ipc_call_static_init(&call);
375 IPC_SET_METHOD(call.data, method);
376 IPC_SET_ARG1(call.data, arg1);
377 IPC_SET_ARG2(call.data, arg2);
378 IPC_SET_ARG3(call.data, arg3);
379
380 if (!(res = request_preprocess(&call))) {
381 ipc_call_sync(phone, &call);
382 process_answer(&call);
383 } else {
384 IPC_SET_RETVAL(call.data, res);
385 }
386 STRUCT_TO_USPACE(&data->args, &call.data.args);
387
388 return 0;
389}
390
391/** Make a synchronous IPC call allowing to transmit the entire payload.
392 *
393 * @param phoneid Phone handle for the call.
394 * @param question Userspace address of call data with the request.
395 * @param reply Userspace address of call data where to store the
396 * answer.
397 *
398 * @return Zero on success or an error code.
399 */
400unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
401 ipc_data_t *reply)
402{
403 call_t call;
404 phone_t *phone;
405 int res;
406 int rc;
407
408 ipc_call_static_init(&call);
409 rc = copy_from_uspace(&call.data.args, &question->args,
410 sizeof(call.data.args));
411 if (rc != 0)
412 return (unative_t) rc;
413
414 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
415
416 if (!(res = request_preprocess(&call))) {
417 ipc_call_sync(phone, &call);
418 process_answer(&call);
419 } else
420 IPC_SET_RETVAL(call.data, res);
421
422 rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
423 if (rc != 0)
424 return rc;
425
426 return 0;
427}
428
429/** Check that the task did not exceed the allowed limit of asynchronous calls.
430 *
431 * @return Return 0 if limit not reached or -1 if limit exceeded.
432 */
433static int check_call_limit(void)
434{
435 if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
436 atomic_dec(&TASK->active_calls);
437 return -1;
438 }
439 return 0;
440}
441
442/** Make a fast asynchronous call over IPC.
443 *
444 * This function can only handle two arguments of payload, but is faster than
445 * the generic function sys_ipc_call_async().
446 *
447 * @param phoneid Phone handle for the call.
448 * @param method Method of the call.
449 * @param arg1 Service-defined payload argument.
450 * @param arg2 Service-defined payload argument.
451 *
452 * @return Return call hash on success.
453 * Return IPC_CALLRET_FATAL in case of a fatal error and
454 * IPC_CALLRET_TEMPORARY if there are too many pending
455 * asynchronous requests; answers should be handled first.
456 */
457unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
458 unative_t arg1, unative_t arg2)
459{
460 call_t *call;
461 phone_t *phone;
462 int res;
463
464 if (check_call_limit())
465 return IPC_CALLRET_TEMPORARY;
466
467 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
468
469 call = ipc_call_alloc(0);
470 IPC_SET_METHOD(call->data, method);
471 IPC_SET_ARG1(call->data, arg1);
472 IPC_SET_ARG2(call->data, arg2);
473 IPC_SET_ARG3(call->data, 0);
474
475 if (!(res = request_preprocess(call)))
476 ipc_call(phone, call);
477 else
478 ipc_backsend_err(phone, call, res);
479
480 return (unative_t) call;
481}
482
483/** Make an asynchronous IPC call allowing to transmit the entire payload.
484 *
485 * @param phoneid Phone handle for the call.
486 * @param data Userspace address of call data with the request.
487 *
488 * @return See sys_ipc_call_async_fast().
489 */
490unative_t sys_ipc_call_async(unative_t phoneid, ipc_data_t *data)
491{
492 call_t *call;
493 phone_t *phone;
494 int res;
495 int rc;
496
497 if (check_call_limit())
498 return IPC_CALLRET_TEMPORARY;
499
500 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
501
502 call = ipc_call_alloc(0);
503 rc = copy_from_uspace(&call->data.args, &data->args,
504 sizeof(call->data.args));
505 if (rc != 0) {
506 ipc_call_free(call);
507 return (unative_t) rc;
508 }
509 if (!(res = request_preprocess(call)))
510 ipc_call(phone, call);
511 else
512 ipc_backsend_err(phone, call, res);
513
514 return (unative_t) call;
515}
516
517/** Forward a received call to another destination.
518 *
519 * @param callid Hash of the call to forward.
520 * @param phoneid Phone handle to use for forwarding.
521 * @param method New method to use for the forwarded call.
522 * @param arg1 New value of the first argument for the forwarded call.
523 *
524 * @return Return 0 on succes, otherwise return an error code.
525 *
526 * In case the original method is a system method, ARG1 and ARG2 are overwritten
527 * in the forwarded message with the new method and the new arg1, respectively.
528 * Otherwise the METHOD and ARG1 are rewritten with the new method and arg1,
529 * respectively. Also note there is a set of immutable methods, for which the
530 * new method and argument is not set and these values are ignored.
531 *
532 * Warning: If implementing non-fast version, make sure that
533 * ARG3 is not rewritten for certain system IPC
534 */
535unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
536 unative_t method, unative_t arg1)
537{
538 call_t *call;
539 phone_t *phone;
540
541 call = get_call(callid);
542 if (!call)
543 return ENOENT;
544
545 call->flags |= IPC_CALL_FORWARDED;
546
547 GET_CHECK_PHONE(phone, phoneid, {
548 IPC_SET_RETVAL(call->data, EFORWARD);
549 ipc_answer(&TASK->answerbox, call);
550 return ENOENT;
551 });
552
553 if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
554 IPC_SET_RETVAL(call->data, EFORWARD);
555 ipc_answer(&TASK->answerbox, call);
556 return EPERM;
557 }
558
559 /*
560 * Userspace is not allowed to change method of system methods on
561 * forward, allow changing ARG1 and ARG2 by means of method and arg1.
562 * If the method is immutable, don't change anything.
563 */
564 if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
565 if (method_is_system(IPC_GET_METHOD(call->data))) {
566 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
567 phone_dealloc(IPC_GET_ARG3(call->data));
568
569 IPC_SET_ARG1(call->data, method);
570 IPC_SET_ARG2(call->data, arg1);
571 } else {
572 IPC_SET_METHOD(call->data, method);
573 IPC_SET_ARG1(call->data, arg1);
574 }
575 }
576
577 return ipc_forward(call, phone, &TASK->answerbox);
578}
579
580/** Answer an IPC call - fast version.
581 *
582 * This function can handle only two return arguments of payload, but is faster
583 * than the generic sys_ipc_answer().
584 *
585 * @param callid Hash of the call to be answered.
586 * @param retval Return value of the answer.
587 * @param arg1 Service-defined return value.
588 * @param arg2 Service-defined return value.
589 *
590 * @return Return 0 on success, otherwise return an error code.
591 */
592unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
593 unative_t arg1, unative_t arg2)
594{
595 call_t *call;
596 ipc_data_t saved_data;
597 int saveddata = 0;
598 int rc;
599
600 /* Do not answer notification callids */
601 if (callid & IPC_CALLID_NOTIFICATION)
602 return 0;
603
604 call = get_call(callid);
605 if (!call)
606 return ENOENT;
607
608 if (answer_need_old(call)) {
609 memcpy(&saved_data, &call->data, sizeof(call->data));
610 saveddata = 1;
611 }
612
613 IPC_SET_RETVAL(call->data, retval);
614 IPC_SET_ARG1(call->data, arg1);
615 IPC_SET_ARG2(call->data, arg2);
616 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
617
618 ipc_answer(&TASK->answerbox, call);
619 return rc;
620}
621
622/** Answer an IPC call.
623 *
624 * @param callid Hash of the call to be answered.
625 * @param data Userspace address of call data with the answer.
626 *
627 * @return Return 0 on success, otherwise return an error code.
628 */
629unative_t sys_ipc_answer(unative_t callid, ipc_data_t *data)
630{
631 call_t *call;
632 ipc_data_t saved_data;
633 int saveddata = 0;
634 int rc;
635
636 /* Do not answer notification callids */
637 if (callid & IPC_CALLID_NOTIFICATION)
638 return 0;
639
640 call = get_call(callid);
641 if (!call)
642 return ENOENT;
643
644 if (answer_need_old(call)) {
645 memcpy(&saved_data, &call->data, sizeof(call->data));
646 saveddata = 1;
647 }
648 rc = copy_from_uspace(&call->data.args, &data->args,
649 sizeof(call->data.args));
650 if (rc != 0)
651 return rc;
652
653 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
654
655 ipc_answer(&TASK->answerbox, call);
656
657 return rc;
658}
659
660/** Hang up a phone.
661 *
662 * @param Phone handle of the phone to be hung up.
663 *
664 * @return Return 0 on success or an error code.
665 */
666unative_t sys_ipc_hangup(int phoneid)
667{
668 phone_t *phone;
669
670 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
671
672 if (ipc_phone_hangup(phone))
673 return -1;
674
675 return 0;
676}
677
678/** Wait for an incoming IPC call or an answer.
679 *
680 * @param calldata Pointer to buffer where the call/answer data is stored.
681 * @param usec Timeout. See waitq_sleep_timeout() for explanation.
682 * @param flags Select mode of sleep operation. See waitq_sleep_timeout()
683 * for explanation.
684 *
685 * @return Hash of the call.
686 * If IPC_CALLID_NOTIFICATION bit is set in the hash, the
687 * call is a notification. IPC_CALLID_ANSWERED denotes an
688 * answer.
689 */
690unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
691{
692 call_t *call;
693
694restart:
695 call = ipc_wait_for_call(&TASK->answerbox, usec,
696 flags | SYNCH_FLAGS_INTERRUPTIBLE);
697 if (!call)
698 return 0;
699
700 if (call->flags & IPC_CALL_NOTIF) {
701 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
702
703 /* Set in_phone_hash to the interrupt counter */
704 call->data.phone = (void *) call->priv;
705
706 STRUCT_TO_USPACE(calldata, &call->data);
707
708 ipc_call_free(call);
709
710 return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
711 }
712
713 if (call->flags & IPC_CALL_ANSWERED) {
714 process_answer(call);
715
716 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
717
718 atomic_dec(&TASK->active_calls);
719
720 if (call->flags & IPC_CALL_DISCARD_ANSWER) {
721 ipc_call_free(call);
722 goto restart;
723 }
724
725 STRUCT_TO_USPACE(&calldata->args, &call->data.args);
726 ipc_call_free(call);
727
728 return ((unative_t) call) | IPC_CALLID_ANSWERED;
729 }
730
731 if (process_request(&TASK->answerbox, call))
732 goto restart;
733
734 /* Include phone address('id') of the caller in the request,
735 * copy whole call->data, not only call->data.args */
736 if (STRUCT_TO_USPACE(calldata, &call->data)) {
737 return 0;
738 }
739 return (unative_t)call;
740}
741
742/** Connect an IRQ handler to a task.
743 *
744 * @param inr IRQ number.
745 * @param devno Device number.
746 * @param method Method to be associated with the notification.
747 * @param ucode Uspace pointer to the top-half pseudocode.
748 *
749 * @return EPERM or a return code returned by ipc_irq_register().
750 */
751unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
752 irq_code_t *ucode)
753{
754 if (!(cap_get(TASK) & CAP_IRQ_REG))
755 return EPERM;
756
757 return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
758}
759
760/** Disconnect an IRQ handler from a task.
761 *
762 * @param inr IRQ number.
763 * @param devno Device number.
764 *
765 * @return Zero on success or EPERM on error..
766 */
767unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
768{
769 if (!(cap_get(TASK) & CAP_IRQ_REG))
770 return EPERM;
771
772 ipc_irq_unregister(&TASK->answerbox, inr, devno);
773
774 return 0;
775}
776
777/** @}
778 */
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