source: mainline/kernel/generic/src/ipc/sysipc.c@ 654b7db

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 654b7db was 654b7db, checked in by Jakub Jermar <jakub@…>, 18 years ago

Release the IPC_M_DATA_WRITE buffer even if the write is refused by the
recipient.
  • Property mode set to 100644
File size: 21.5 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/**
53 * Maximum buffer size allowed for IPC_M_DATA_WRITE and IPC_M_DATA_READ
54 * requests.
55 */
56#define DATA_XFER_LIMIT (64 * 1024)
57
58#define GET_CHECK_PHONE(phone, phoneid, err) \
59{ \
60 if (phoneid > IPC_MAX_PHONES) { \
61 err; \
62 } \
63 phone = &TASK->phones[phoneid]; \
64}
65
66#define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src)))
67
68/** Decide if the method is a system method.
69 *
70 * @param method Method to be decided.
71 *
72 * @return Return 1 if the method is a system method.
73 * Otherwise return 0.
74 */
75static inline int method_is_system(unative_t method)
76{
77 if (method <= IPC_M_LAST_SYSTEM)
78 return 1;
79 return 0;
80}
81
82/** Decide if the message with this method is forwardable.
83 *
84 * - some system messages may be forwarded, for some of them
85 * it is useless
86 *
87 * @param method Method to be decided.
88 *
89 * @return Return 1 if the method is forwardable.
90 * Otherwise return 0.
91 */
92static inline int method_is_forwardable(unative_t method)
93{
94 switch (method) {
95 case IPC_M_PHONE_HUNGUP:
96 /* This message is meant only for the original recipient. */
97 return 0;
98 default:
99 return 1;
100 }
101}
102
103/** Decide if the message with this method is immutable on forward.
104 *
105 * - some system messages may be forwarded but their content cannot be altered
106 *
107 * @param method Method to be decided.
108 *
109 * @return Return 1 if the method is immutable on forward.
110 * Otherwise return 0.
111 */
112static inline int method_is_immutable(unative_t method)
113{
114 switch (method) {
115 case IPC_M_AS_AREA_SEND:
116 case IPC_M_AS_AREA_RECV:
117 case IPC_M_DATA_WRITE:
118 case IPC_M_DATA_READ:
119 return 1;
120 break;
121 default:
122 return 0;
123 }
124}
125
126
127/***********************************************************************
128 * Functions that preprocess answer before sending it to the recepient.
129 ***********************************************************************/
130
131/** Decide if the caller (e.g. ipc_answer()) should save the old call contents
132 * for answer_preprocess().
133 *
134 * @param call Call structure to be decided.
135 *
136 * @return Return 1 if the old call contents should be saved.
137 * Return 0 otherwise.
138 */
139static inline int answer_need_old(call_t *call)
140{
141 switch (IPC_GET_METHOD(call->data)) {
142 case IPC_M_CONNECT_TO_ME:
143 case IPC_M_CONNECT_ME_TO:
144 case IPC_M_AS_AREA_SEND:
145 case IPC_M_AS_AREA_RECV:
146 case IPC_M_DATA_WRITE:
147 case IPC_M_DATA_READ:
148 return 1;
149 default:
150 return 0;
151 }
152}
153
154/** Interpret process answer as control information.
155 *
156 * This function is called directly after sys_ipc_answer().
157 *
158 * @param answer Call structure with the answer.
159 * @param olddata Saved data of the request.
160 *
161 * @return Return 0 on success or an error code.
162 */
163static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
164{
165 int phoneid;
166
167 if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
168 /* In case of forward, hangup the forwared phone,
169 * not the originator
170 */
171 spinlock_lock(&answer->data.phone->lock);
172 spinlock_lock(&TASK->answerbox.lock);
173 if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
174 list_remove(&answer->data.phone->link);
175 answer->data.phone->state = IPC_PHONE_SLAMMED;
176 }
177 spinlock_unlock(&TASK->answerbox.lock);
178 spinlock_unlock(&answer->data.phone->lock);
179 }
180
181 if (!olddata)
182 return 0;
183
184 if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
185 phoneid = IPC_GET_ARG5(*olddata);
186 if (IPC_GET_RETVAL(answer->data)) {
187 /* The connection was not accepted */
188 phone_dealloc(phoneid);
189 } else {
190 /* The connection was accepted */
191 phone_connect(phoneid, &answer->sender->answerbox);
192 /* Set 'phone hash' as arg5 of response */
193 IPC_SET_ARG5(answer->data,
194 (unative_t) &TASK->phones[phoneid]);
195 }
196 } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
197 /* If the users accepted call, connect */
198 if (!IPC_GET_RETVAL(answer->data)) {
199 ipc_phone_connect((phone_t *) IPC_GET_ARG5(*olddata),
200 &TASK->answerbox);
201 }
202 } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
203 if (!IPC_GET_RETVAL(answer->data)) {
204 /* Accepted, handle as_area receipt */
205 ipl_t ipl;
206 int rc;
207 as_t *as;
208
209 ipl = interrupts_disable();
210 spinlock_lock(&answer->sender->lock);
211 as = answer->sender->as;
212 spinlock_unlock(&answer->sender->lock);
213 interrupts_restore(ipl);
214
215 rc = as_area_share(as, IPC_GET_ARG1(*olddata),
216 IPC_GET_ARG2(*olddata), AS,
217 IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
218 IPC_SET_RETVAL(answer->data, rc);
219 return rc;
220 }
221 } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
222 if (!IPC_GET_RETVAL(answer->data)) {
223 ipl_t ipl;
224 as_t *as;
225 int rc;
226
227 ipl = interrupts_disable();
228 spinlock_lock(&answer->sender->lock);
229 as = answer->sender->as;
230 spinlock_unlock(&answer->sender->lock);
231 interrupts_restore(ipl);
232
233 rc = as_area_share(AS, IPC_GET_ARG1(answer->data),
234 IPC_GET_ARG2(*olddata), as, IPC_GET_ARG1(*olddata),
235 IPC_GET_ARG2(answer->data));
236 IPC_SET_RETVAL(answer->data, rc);
237 }
238 } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
239 ASSERT(answer->buffer);
240 if (!IPC_GET_RETVAL(answer->data)) {
241 int rc;
242 uintptr_t dst;
243 uintptr_t size;
244
245 dst = IPC_GET_ARG1(answer->data);
246 size = IPC_GET_ARG3(answer->data);
247
248 rc = copy_to_uspace((void *) dst, answer->buffer, size);
249 if (rc != 0)
250 IPC_SET_RETVAL(answer->data, rc);
251 }
252 free(answer->buffer);
253 answer->buffer = NULL;
254 }
255 return 0;
256}
257
258/** Called before the request is sent.
259 *
260 * @param call Call structure with the request.
261 *
262 * @return Return 0 on success, ELIMIT or EPERM on error.
263 */
264static int request_preprocess(call_t *call)
265{
266 int newphid;
267 size_t size;
268 uintptr_t src;
269 int rc;
270
271 switch (IPC_GET_METHOD(call->data)) {
272 case IPC_M_CONNECT_ME_TO:
273 newphid = phone_alloc();
274 if (newphid < 0)
275 return ELIMIT;
276 /* Set arg5 for server */
277 IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
278 call->flags |= IPC_CALL_CONN_ME_TO;
279 call->priv = newphid;
280 break;
281 case IPC_M_AS_AREA_SEND:
282 size = as_area_get_size(IPC_GET_ARG1(call->data));
283 if (!size)
284 return EPERM;
285 IPC_SET_ARG2(call->data, size);
286 break;
287 case IPC_M_DATA_WRITE:
288 src = IPC_GET_ARG2(call->data);
289 size = IPC_GET_ARG3(call->data);
290
291 if ((size <= 0) || (size > DATA_XFER_LIMIT))
292 return ELIMIT;
293
294 call->buffer = (uint8_t *) malloc(size, 0);
295 rc = copy_from_uspace(call->buffer, (void *) src, size);
296 if (rc != 0) {
297 free(call->buffer);
298 return rc;
299 }
300 break;
301 default:
302 break;
303 }
304 return 0;
305}
306
307/*******************************************************************************
308 * Functions called to process received call/answer before passing it to uspace.
309 *******************************************************************************/
310
311/** Do basic kernel processing of received call answer.
312 *
313 * @param call Call structure with the answer.
314 */
315static void process_answer(call_t *call)
316{
317 if (IPC_GET_RETVAL(call->data) == EHANGUP &&
318 (call->flags & IPC_CALL_FORWARDED))
319 IPC_SET_RETVAL(call->data, EFORWARD);
320
321 if (call->flags & IPC_CALL_CONN_ME_TO) {
322 if (IPC_GET_RETVAL(call->data))
323 phone_dealloc(call->priv);
324 else
325 IPC_SET_ARG5(call->data, call->priv);
326 }
327}
328
329/** Do basic kernel processing of received call request.
330 *
331 * @param box Destination answerbox structure.
332 * @param call Call structure with the request.
333 *
334 * @return Return 0 if the call should be passed to userspace.
335 * Return -1 if the call should be ignored.
336 */
337static int process_request(answerbox_t *box, call_t *call)
338{
339 int phoneid;
340
341 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
342 phoneid = phone_alloc();
343 if (phoneid < 0) { /* Failed to allocate phone */
344 IPC_SET_RETVAL(call->data, ELIMIT);
345 ipc_answer(box, call);
346 return -1;
347 }
348 IPC_SET_ARG5(call->data, phoneid);
349 }
350 return 0;
351}
352
353/** Make a fast call over IPC, wait for reply and return to user.
354 *
355 * This function can handle only three arguments of payload, but is faster than
356 * the generic function (i.e. sys_ipc_call_sync_slow()).
357 *
358 * @param phoneid Phone handle for the call.
359 * @param method Method of the call.
360 * @param arg1 Service-defined payload argument.
361 * @param arg2 Service-defined payload argument.
362 * @param arg3 Service-defined payload argument.
363 * @param data Address of userspace structure where the reply call will
364 * be stored.
365 *
366 * @return Returns 0 on success.
367 * Return ENOENT if there is no such phone handle.
368 */
369unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
370 unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
371{
372 call_t call;
373 phone_t *phone;
374 int res;
375 int rc;
376
377 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
378
379 ipc_call_static_init(&call);
380 IPC_SET_METHOD(call.data, method);
381 IPC_SET_ARG1(call.data, arg1);
382 IPC_SET_ARG2(call.data, arg2);
383 IPC_SET_ARG3(call.data, arg3);
384 /*
385 * To achieve deterministic behavior, zero out arguments that are beyond
386 * the limits of the fast version.
387 */
388 IPC_SET_ARG4(call.data, 0);
389 IPC_SET_ARG5(call.data, 0);
390
391 if (!(res = request_preprocess(&call))) {
392 ipc_call_sync(phone, &call);
393 process_answer(&call);
394 } else {
395 IPC_SET_RETVAL(call.data, res);
396 }
397 rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
398 if (rc != 0)
399 return rc;
400
401 return 0;
402}
403
404/** Make a synchronous IPC call allowing to transmit the entire payload.
405 *
406 * @param phoneid Phone handle for the call.
407 * @param question Userspace address of call data with the request.
408 * @param reply Userspace address of call data where to store the
409 * answer.
410 *
411 * @return Zero on success or an error code.
412 */
413unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
414 ipc_data_t *reply)
415{
416 call_t call;
417 phone_t *phone;
418 int res;
419 int rc;
420
421 ipc_call_static_init(&call);
422 rc = copy_from_uspace(&call.data.args, &question->args,
423 sizeof(call.data.args));
424 if (rc != 0)
425 return (unative_t) rc;
426
427 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
428
429 if (!(res = request_preprocess(&call))) {
430 ipc_call_sync(phone, &call);
431 process_answer(&call);
432 } else
433 IPC_SET_RETVAL(call.data, res);
434
435 rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
436 if (rc != 0)
437 return rc;
438
439 return 0;
440}
441
442/** Check that the task did not exceed the allowed limit of asynchronous calls.
443 *
444 * @return Return 0 if limit not reached or -1 if limit exceeded.
445 */
446static int check_call_limit(void)
447{
448 if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
449 atomic_dec(&TASK->active_calls);
450 return -1;
451 }
452 return 0;
453}
454
455/** Make a fast asynchronous call over IPC.
456 *
457 * This function can only handle four arguments of payload, but is faster than
458 * the generic function sys_ipc_call_async_slow().
459 *
460 * @param phoneid Phone handle for the call.
461 * @param method Method of the call.
462 * @param arg1 Service-defined payload argument.
463 * @param arg2 Service-defined payload argument.
464 * @param arg3 Service-defined payload argument.
465 * @param arg4 Service-defined payload argument.
466 *
467 * @return Return call hash on success.
468 * Return IPC_CALLRET_FATAL in case of a fatal error and
469 * IPC_CALLRET_TEMPORARY if there are too many pending
470 * asynchronous requests; answers should be handled first.
471 */
472unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
473 unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
474{
475 call_t *call;
476 phone_t *phone;
477 int res;
478
479 if (check_call_limit())
480 return IPC_CALLRET_TEMPORARY;
481
482 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
483
484 call = ipc_call_alloc(0);
485 IPC_SET_METHOD(call->data, method);
486 IPC_SET_ARG1(call->data, arg1);
487 IPC_SET_ARG2(call->data, arg2);
488 IPC_SET_ARG3(call->data, arg3);
489 IPC_SET_ARG4(call->data, arg4);
490 /*
491 * To achieve deterministic behavior, zero out arguments that are beyond
492 * the limits of the fast version.
493 */
494 IPC_SET_ARG5(call->data, 0);
495
496 if (!(res = request_preprocess(call)))
497 ipc_call(phone, call);
498 else
499 ipc_backsend_err(phone, call, res);
500
501 return (unative_t) call;
502}
503
504/** Make an asynchronous IPC call allowing to transmit the entire payload.
505 *
506 * @param phoneid Phone handle for the call.
507 * @param data Userspace address of call data with the request.
508 *
509 * @return See sys_ipc_call_async_fast().
510 */
511unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data)
512{
513 call_t *call;
514 phone_t *phone;
515 int res;
516 int rc;
517
518 if (check_call_limit())
519 return IPC_CALLRET_TEMPORARY;
520
521 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
522
523 call = ipc_call_alloc(0);
524 rc = copy_from_uspace(&call->data.args, &data->args,
525 sizeof(call->data.args));
526 if (rc != 0) {
527 ipc_call_free(call);
528 return (unative_t) rc;
529 }
530 if (!(res = request_preprocess(call)))
531 ipc_call(phone, call);
532 else
533 ipc_backsend_err(phone, call, res);
534
535 return (unative_t) call;
536}
537
538/** Forward a received call to another destination.
539 *
540 * @param callid Hash of the call to forward.
541 * @param phoneid Phone handle to use for forwarding.
542 * @param method New method to use for the forwarded call.
543 * @param arg1 New value of the first argument for the forwarded call.
544 * @param arg2 New value of the second argument for the forwarded call.
545 * @param mode Flags that specify mode of the forward operation.
546 *
547 * @return Return 0 on succes, otherwise return an error code.
548 *
549 * In case the original method is a system method, ARG1, ARG2 and ARG3 are
550 * overwritten in the forwarded message with the new method and the new arg1 and
551 * arg2, respectively. Otherwise the METHOD, ARG1 and ARG2 are rewritten with
552 * the new method, arg1 and arg2, respectively. Also note there is a set of
553 * immutable methods, for which the new method and argument is not set and
554 * these values are ignored.
555 *
556 * Warning: When implementing support for changing additional payload
557 * arguments, make sure that ARG5 is not rewritten for certain
558 * system IPC
559 */
560unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
561 unative_t method, unative_t arg1, unative_t arg2, int mode)
562{
563 call_t *call;
564 phone_t *phone;
565
566 call = get_call(callid);
567 if (!call)
568 return ENOENT;
569
570 call->flags |= IPC_CALL_FORWARDED;
571
572 GET_CHECK_PHONE(phone, phoneid, {
573 IPC_SET_RETVAL(call->data, EFORWARD);
574 ipc_answer(&TASK->answerbox, call);
575 return ENOENT;
576 });
577
578 if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
579 IPC_SET_RETVAL(call->data, EFORWARD);
580 ipc_answer(&TASK->answerbox, call);
581 return EPERM;
582 }
583
584 /*
585 * Userspace is not allowed to change method of system methods on
586 * forward, allow changing ARG1, ARG2 and ARG3 by means of method,
587 * arg1 and arg2.
588 * If the method is immutable, don't change anything.
589 */
590 if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
591 if (method_is_system(IPC_GET_METHOD(call->data))) {
592 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
593 phone_dealloc(IPC_GET_ARG5(call->data));
594
595 IPC_SET_ARG1(call->data, method);
596 IPC_SET_ARG2(call->data, arg1);
597 IPC_SET_ARG3(call->data, arg2);
598 } else {
599 IPC_SET_METHOD(call->data, method);
600 IPC_SET_ARG1(call->data, arg1);
601 IPC_SET_ARG2(call->data, arg2);
602 }
603 }
604
605 return ipc_forward(call, phone, &TASK->answerbox, mode);
606}
607
608/** Answer an IPC call - fast version.
609 *
610 * This function can handle only two return arguments of payload, but is faster
611 * than the generic sys_ipc_answer().
612 *
613 * @param callid Hash of the call to be answered.
614 * @param retval Return value of the answer.
615 * @param arg1 Service-defined return value.
616 * @param arg2 Service-defined return value.
617 * @param arg3 Service-defined return value.
618 * @param arg4 Service-defined return value.
619 *
620 * @return Return 0 on success, otherwise return an error code.
621 */
622unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
623 unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
624{
625 call_t *call;
626 ipc_data_t saved_data;
627 int saveddata = 0;
628 int rc;
629
630 /* Do not answer notification callids */
631 if (callid & IPC_CALLID_NOTIFICATION)
632 return 0;
633
634 call = get_call(callid);
635 if (!call)
636 return ENOENT;
637
638 if (answer_need_old(call)) {
639 memcpy(&saved_data, &call->data, sizeof(call->data));
640 saveddata = 1;
641 }
642
643 IPC_SET_RETVAL(call->data, retval);
644 IPC_SET_ARG1(call->data, arg1);
645 IPC_SET_ARG2(call->data, arg2);
646 IPC_SET_ARG3(call->data, arg3);
647 IPC_SET_ARG4(call->data, arg4);
648 /*
649 * To achieve deterministic behavior, zero out arguments that are beyond
650 * the limits of the fast version.
651 */
652 IPC_SET_ARG5(call->data, 0);
653 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
654
655 ipc_answer(&TASK->answerbox, call);
656 return rc;
657}
658
659/** Answer an IPC call.
660 *
661 * @param callid Hash of the call to be answered.
662 * @param data Userspace address of call data with the answer.
663 *
664 * @return Return 0 on success, otherwise return an error code.
665 */
666unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data)
667{
668 call_t *call;
669 ipc_data_t saved_data;
670 int saveddata = 0;
671 int rc;
672
673 /* Do not answer notification callids */
674 if (callid & IPC_CALLID_NOTIFICATION)
675 return 0;
676
677 call = get_call(callid);
678 if (!call)
679 return ENOENT;
680
681 if (answer_need_old(call)) {
682 memcpy(&saved_data, &call->data, sizeof(call->data));
683 saveddata = 1;
684 }
685 rc = copy_from_uspace(&call->data.args, &data->args,
686 sizeof(call->data.args));
687 if (rc != 0)
688 return rc;
689
690 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
691
692 ipc_answer(&TASK->answerbox, call);
693
694 return rc;
695}
696
697/** Hang up a phone.
698 *
699 * @param Phone handle of the phone to be hung up.
700 *
701 * @return Return 0 on success or an error code.
702 */
703unative_t sys_ipc_hangup(int phoneid)
704{
705 phone_t *phone;
706
707 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
708
709 if (ipc_phone_hangup(phone))
710 return -1;
711
712 return 0;
713}
714
715/** Wait for an incoming IPC call or an answer.
716 *
717 * @param calldata Pointer to buffer where the call/answer data is stored.
718 * @param usec Timeout. See waitq_sleep_timeout() for explanation.
719 * @param flags Select mode of sleep operation. See waitq_sleep_timeout()
720 * for explanation.
721 *
722 * @return Hash of the call.
723 * If IPC_CALLID_NOTIFICATION bit is set in the hash, the
724 * call is a notification. IPC_CALLID_ANSWERED denotes an
725 * answer.
726 */
727unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
728{
729 call_t *call;
730
731restart:
732 call = ipc_wait_for_call(&TASK->answerbox, usec,
733 flags | SYNCH_FLAGS_INTERRUPTIBLE);
734 if (!call)
735 return 0;
736
737 if (call->flags & IPC_CALL_NOTIF) {
738 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
739
740 /* Set in_phone_hash to the interrupt counter */
741 call->data.phone = (void *) call->priv;
742
743 STRUCT_TO_USPACE(calldata, &call->data);
744
745 ipc_call_free(call);
746
747 return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
748 }
749
750 if (call->flags & IPC_CALL_ANSWERED) {
751 process_answer(call);
752
753 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
754
755 atomic_dec(&TASK->active_calls);
756
757 if (call->flags & IPC_CALL_DISCARD_ANSWER) {
758 ipc_call_free(call);
759 goto restart;
760 }
761
762 STRUCT_TO_USPACE(&calldata->args, &call->data.args);
763 ipc_call_free(call);
764
765 return ((unative_t) call) | IPC_CALLID_ANSWERED;
766 }
767
768 if (process_request(&TASK->answerbox, call))
769 goto restart;
770
771 /* Include phone address('id') of the caller in the request,
772 * copy whole call->data, not only call->data.args */
773 if (STRUCT_TO_USPACE(calldata, &call->data)) {
774 return 0;
775 }
776 return (unative_t)call;
777}
778
779/** Connect an IRQ handler to a task.
780 *
781 * @param inr IRQ number.
782 * @param devno Device number.
783 * @param method Method to be associated with the notification.
784 * @param ucode Uspace pointer to the top-half pseudocode.
785 *
786 * @return EPERM or a return code returned by ipc_irq_register().
787 */
788unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
789 irq_code_t *ucode)
790{
791 if (!(cap_get(TASK) & CAP_IRQ_REG))
792 return EPERM;
793
794 return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
795}
796
797/** Disconnect an IRQ handler from a task.
798 *
799 * @param inr IRQ number.
800 * @param devno Device number.
801 *
802 * @return Zero on success or EPERM on error..
803 */
804unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
805{
806 if (!(cap_get(TASK) & CAP_IRQ_REG))
807 return EPERM;
808
809 ipc_irq_unregister(&TASK->answerbox, inr, devno);
810
811 return 0;
812}
813
814/** @}
815 */
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