source: mainline/kernel/generic/src/ipc/sysipc.c@ b74959bd

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since b74959bd was b74959bd, checked in by Jakub Jermar <jakub@…>, 18 years ago

Modify ipc_answer_*() to make use of all six syscall arguments. The recommended
means of answering calls is via the ipc_answer_m() macros (where m denotes the
number of return arguments) that automatically decide between the fast register
version or the slow universal version of ipc_answer().
  • Property mode set to 100644
File size: 20.7 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 int rc;
372
373 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
374
375 ipc_call_static_init(&call);
376 IPC_SET_METHOD(call.data, method);
377 IPC_SET_ARG1(call.data, arg1);
378 IPC_SET_ARG2(call.data, arg2);
379 IPC_SET_ARG3(call.data, arg3);
380
381 if (!(res = request_preprocess(&call))) {
382 ipc_call_sync(phone, &call);
383 process_answer(&call);
384 } else {
385 IPC_SET_RETVAL(call.data, res);
386 }
387 rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
388 if (rc != 0)
389 return rc;
390
391 return 0;
392}
393
394/** Make a synchronous IPC call allowing to transmit the entire payload.
395 *
396 * @param phoneid Phone handle for the call.
397 * @param question Userspace address of call data with the request.
398 * @param reply Userspace address of call data where to store the
399 * answer.
400 *
401 * @return Zero on success or an error code.
402 */
403unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
404 ipc_data_t *reply)
405{
406 call_t call;
407 phone_t *phone;
408 int res;
409 int rc;
410
411 ipc_call_static_init(&call);
412 rc = copy_from_uspace(&call.data.args, &question->args,
413 sizeof(call.data.args));
414 if (rc != 0)
415 return (unative_t) rc;
416
417 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
418
419 if (!(res = request_preprocess(&call))) {
420 ipc_call_sync(phone, &call);
421 process_answer(&call);
422 } else
423 IPC_SET_RETVAL(call.data, res);
424
425 rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
426 if (rc != 0)
427 return rc;
428
429 return 0;
430}
431
432/** Check that the task did not exceed the allowed limit of asynchronous calls.
433 *
434 * @return Return 0 if limit not reached or -1 if limit exceeded.
435 */
436static int check_call_limit(void)
437{
438 if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
439 atomic_dec(&TASK->active_calls);
440 return -1;
441 }
442 return 0;
443}
444
445/** Make a fast asynchronous call over IPC.
446 *
447 * This function can only handle four arguments of payload, but is faster than
448 * the generic function sys_ipc_call_async_slow().
449 *
450 * @param phoneid Phone handle for the call.
451 * @param method Method of the call.
452 * @param arg1 Service-defined payload argument.
453 * @param arg2 Service-defined payload argument.
454 * @param arg3 Service-defined payload argument.
455 * @param arg4 Service-defined payload argument.
456 *
457 * @return Return call hash on success.
458 * Return IPC_CALLRET_FATAL in case of a fatal error and
459 * IPC_CALLRET_TEMPORARY if there are too many pending
460 * asynchronous requests; answers should be handled first.
461 */
462unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
463 unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
464{
465 call_t *call;
466 phone_t *phone;
467 int res;
468
469 if (check_call_limit())
470 return IPC_CALLRET_TEMPORARY;
471
472 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
473
474 call = ipc_call_alloc(0);
475 IPC_SET_METHOD(call->data, method);
476 IPC_SET_ARG1(call->data, arg1);
477 IPC_SET_ARG2(call->data, arg2);
478 IPC_SET_ARG3(call->data, arg3);
479 IPC_SET_ARG4(call->data, arg4);
480
481 if (!(res = request_preprocess(call)))
482 ipc_call(phone, call);
483 else
484 ipc_backsend_err(phone, call, res);
485
486 return (unative_t) call;
487}
488
489/** Make an asynchronous IPC call allowing to transmit the entire payload.
490 *
491 * @param phoneid Phone handle for the call.
492 * @param data Userspace address of call data with the request.
493 *
494 * @return See sys_ipc_call_async_fast().
495 */
496unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data)
497{
498 call_t *call;
499 phone_t *phone;
500 int res;
501 int rc;
502
503 if (check_call_limit())
504 return IPC_CALLRET_TEMPORARY;
505
506 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
507
508 call = ipc_call_alloc(0);
509 rc = copy_from_uspace(&call->data.args, &data->args,
510 sizeof(call->data.args));
511 if (rc != 0) {
512 ipc_call_free(call);
513 return (unative_t) rc;
514 }
515 if (!(res = request_preprocess(call)))
516 ipc_call(phone, call);
517 else
518 ipc_backsend_err(phone, call, res);
519
520 return (unative_t) call;
521}
522
523/** Forward a received call to another destination.
524 *
525 * @param callid Hash of the call to forward.
526 * @param phoneid Phone handle to use for forwarding.
527 * @param method New method to use for the forwarded call.
528 * @param arg1 New value of the first argument for the forwarded call.
529 *
530 * @return Return 0 on succes, otherwise return an error code.
531 *
532 * In case the original method is a system method, ARG1 and ARG2 are overwritten
533 * in the forwarded message with the new method and the new arg1, respectively.
534 * Otherwise the METHOD and ARG1 are rewritten with the new method and arg1,
535 * respectively. Also note there is a set of immutable methods, for which the
536 * new method and argument is not set and these values are ignored.
537 *
538 * Warning: If implementing non-fast version, make sure that
539 * ARG3 is not rewritten for certain system IPC
540 */
541unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
542 unative_t method, unative_t arg1)
543{
544 call_t *call;
545 phone_t *phone;
546
547 call = get_call(callid);
548 if (!call)
549 return ENOENT;
550
551 call->flags |= IPC_CALL_FORWARDED;
552
553 GET_CHECK_PHONE(phone, phoneid, {
554 IPC_SET_RETVAL(call->data, EFORWARD);
555 ipc_answer(&TASK->answerbox, call);
556 return ENOENT;
557 });
558
559 if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
560 IPC_SET_RETVAL(call->data, EFORWARD);
561 ipc_answer(&TASK->answerbox, call);
562 return EPERM;
563 }
564
565 /*
566 * Userspace is not allowed to change method of system methods on
567 * forward, allow changing ARG1 and ARG2 by means of method and arg1.
568 * If the method is immutable, don't change anything.
569 */
570 if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
571 if (method_is_system(IPC_GET_METHOD(call->data))) {
572 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
573 phone_dealloc(IPC_GET_ARG3(call->data));
574
575 IPC_SET_ARG1(call->data, method);
576 IPC_SET_ARG2(call->data, arg1);
577 } else {
578 IPC_SET_METHOD(call->data, method);
579 IPC_SET_ARG1(call->data, arg1);
580 }
581 }
582
583 return ipc_forward(call, phone, &TASK->answerbox);
584}
585
586/** Answer an IPC call - fast version.
587 *
588 * This function can handle only two return arguments of payload, but is faster
589 * than the generic sys_ipc_answer().
590 *
591 * @param callid Hash of the call to be answered.
592 * @param retval Return value of the answer.
593 * @param arg1 Service-defined return value.
594 * @param arg2 Service-defined return value.
595 * @param arg3 Service-defined return value.
596 * @param arg4 Service-defined return value.
597 *
598 * @return Return 0 on success, otherwise return an error code.
599 */
600unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
601 unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
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
621 IPC_SET_RETVAL(call->data, retval);
622 IPC_SET_ARG1(call->data, arg1);
623 IPC_SET_ARG2(call->data, arg2);
624 IPC_SET_ARG3(call->data, arg3);
625 IPC_SET_ARG4(call->data, arg4);
626 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
627
628 ipc_answer(&TASK->answerbox, call);
629 return rc;
630}
631
632/** Answer an IPC call.
633 *
634 * @param callid Hash of the call to be answered.
635 * @param data Userspace address of call data with the answer.
636 *
637 * @return Return 0 on success, otherwise return an error code.
638 */
639unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data)
640{
641 call_t *call;
642 ipc_data_t saved_data;
643 int saveddata = 0;
644 int rc;
645
646 /* Do not answer notification callids */
647 if (callid & IPC_CALLID_NOTIFICATION)
648 return 0;
649
650 call = get_call(callid);
651 if (!call)
652 return ENOENT;
653
654 if (answer_need_old(call)) {
655 memcpy(&saved_data, &call->data, sizeof(call->data));
656 saveddata = 1;
657 }
658 rc = copy_from_uspace(&call->data.args, &data->args,
659 sizeof(call->data.args));
660 if (rc != 0)
661 return rc;
662
663 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
664
665 ipc_answer(&TASK->answerbox, call);
666
667 return rc;
668}
669
670/** Hang up a phone.
671 *
672 * @param Phone handle of the phone to be hung up.
673 *
674 * @return Return 0 on success or an error code.
675 */
676unative_t sys_ipc_hangup(int phoneid)
677{
678 phone_t *phone;
679
680 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
681
682 if (ipc_phone_hangup(phone))
683 return -1;
684
685 return 0;
686}
687
688/** Wait for an incoming IPC call or an answer.
689 *
690 * @param calldata Pointer to buffer where the call/answer data is stored.
691 * @param usec Timeout. See waitq_sleep_timeout() for explanation.
692 * @param flags Select mode of sleep operation. See waitq_sleep_timeout()
693 * for explanation.
694 *
695 * @return Hash of the call.
696 * If IPC_CALLID_NOTIFICATION bit is set in the hash, the
697 * call is a notification. IPC_CALLID_ANSWERED denotes an
698 * answer.
699 */
700unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
701{
702 call_t *call;
703
704restart:
705 call = ipc_wait_for_call(&TASK->answerbox, usec,
706 flags | SYNCH_FLAGS_INTERRUPTIBLE);
707 if (!call)
708 return 0;
709
710 if (call->flags & IPC_CALL_NOTIF) {
711 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
712
713 /* Set in_phone_hash to the interrupt counter */
714 call->data.phone = (void *) call->priv;
715
716 STRUCT_TO_USPACE(calldata, &call->data);
717
718 ipc_call_free(call);
719
720 return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
721 }
722
723 if (call->flags & IPC_CALL_ANSWERED) {
724 process_answer(call);
725
726 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
727
728 atomic_dec(&TASK->active_calls);
729
730 if (call->flags & IPC_CALL_DISCARD_ANSWER) {
731 ipc_call_free(call);
732 goto restart;
733 }
734
735 STRUCT_TO_USPACE(&calldata->args, &call->data.args);
736 ipc_call_free(call);
737
738 return ((unative_t) call) | IPC_CALLID_ANSWERED;
739 }
740
741 if (process_request(&TASK->answerbox, call))
742 goto restart;
743
744 /* Include phone address('id') of the caller in the request,
745 * copy whole call->data, not only call->data.args */
746 if (STRUCT_TO_USPACE(calldata, &call->data)) {
747 return 0;
748 }
749 return (unative_t)call;
750}
751
752/** Connect an IRQ handler to a task.
753 *
754 * @param inr IRQ number.
755 * @param devno Device number.
756 * @param method Method to be associated with the notification.
757 * @param ucode Uspace pointer to the top-half pseudocode.
758 *
759 * @return EPERM or a return code returned by ipc_irq_register().
760 */
761unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
762 irq_code_t *ucode)
763{
764 if (!(cap_get(TASK) & CAP_IRQ_REG))
765 return EPERM;
766
767 return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
768}
769
770/** Disconnect an IRQ handler from a task.
771 *
772 * @param inr IRQ number.
773 * @param devno Device number.
774 *
775 * @return Zero on success or EPERM on error..
776 */
777unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
778{
779 if (!(cap_get(TASK) & CAP_IRQ_REG))
780 return EPERM;
781
782 ipc_irq_unregister(&TASK->answerbox, inr, devno);
783
784 return 0;
785}
786
787/** @}
788 */
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