source: mainline/kernel/generic/src/ipc/sysipc.c@ a55d5f9f

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since a55d5f9f was a55d5f9f, checked in by Jakub Jermar <jakub@…>, 18 years ago

Add support for IPC_M_DATA_READ calls.
  • Property mode set to 100644
File size: 23.0 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_READ) {
239 ASSERT(!answer->buffer);
240 if (!IPC_GET_RETVAL(answer->data)) {
241 /* The recipient agreed to send data. */
242 uintptr_t src = IPC_GET_ARG1(answer->data);
243 uintptr_t dst = IPC_GET_ARG1(*olddata);
244 size_t max_size = IPC_GET_ARG2(*olddata);
245 size_t size = IPC_GET_ARG2(answer->data);
246 if (size <= max_size) {
247 /*
248 * Copy the destination VA so that this piece of
249 * information is not lost.
250 */
251 IPC_SET_ARG1(answer->data, dst);
252
253 answer->buffer = malloc(size, 0);
254 int rc = copy_from_uspace(answer->buffer,
255 (void *) src, size);
256 if (rc) {
257 IPC_SET_RETVAL(answer->data, rc);
258 free(answer->buffer);
259 answer->buffer = NULL;
260 }
261 } else {
262 IPC_SET_RETVAL(answer->data, ELIMIT);
263 }
264 }
265 } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
266 ASSERT(answer->buffer);
267 if (!IPC_GET_RETVAL(answer->data)) {
268 /* The recipient agreed to receive data. */
269 int rc;
270 uintptr_t dst;
271 uintptr_t size;
272 uintptr_t max_size;
273
274 dst = IPC_GET_ARG1(answer->data);
275 size = IPC_GET_ARG3(answer->data);
276 max_size = IPC_GET_ARG3(*olddata);
277
278 if (size <= max_size) {
279 rc = copy_to_uspace((void *) dst,
280 answer->buffer, size);
281 if (rc)
282 IPC_SET_RETVAL(answer->data, rc);
283 } else {
284 IPC_SET_RETVAL(answer->data, ELIMIT);
285 }
286 }
287 free(answer->buffer);
288 answer->buffer = NULL;
289 }
290 return 0;
291}
292
293/** Called before the request is sent.
294 *
295 * @param call Call structure with the request.
296 *
297 * @return Return 0 on success, ELIMIT or EPERM on error.
298 */
299static int request_preprocess(call_t *call)
300{
301 int newphid;
302 size_t size;
303 uintptr_t src;
304 int rc;
305
306 switch (IPC_GET_METHOD(call->data)) {
307 case IPC_M_CONNECT_ME_TO:
308 newphid = phone_alloc();
309 if (newphid < 0)
310 return ELIMIT;
311 /* Set arg5 for server */
312 IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
313 call->flags |= IPC_CALL_CONN_ME_TO;
314 call->priv = newphid;
315 break;
316 case IPC_M_AS_AREA_SEND:
317 size = as_area_get_size(IPC_GET_ARG1(call->data));
318 if (!size)
319 return EPERM;
320 IPC_SET_ARG2(call->data, size);
321 break;
322 case IPC_M_DATA_READ:
323 size = IPC_GET_ARG2(call->data);
324 if ((size <= 0 || (size > DATA_XFER_LIMIT)))
325 return ELIMIT;
326 break;
327 case IPC_M_DATA_WRITE:
328 src = IPC_GET_ARG2(call->data);
329 size = IPC_GET_ARG3(call->data);
330
331 if ((size <= 0) || (size > DATA_XFER_LIMIT))
332 return ELIMIT;
333
334 call->buffer = (uint8_t *) malloc(size, 0);
335 rc = copy_from_uspace(call->buffer, (void *) src, size);
336 if (rc != 0) {
337 free(call->buffer);
338 return rc;
339 }
340 break;
341 default:
342 break;
343 }
344 return 0;
345}
346
347/*******************************************************************************
348 * Functions called to process received call/answer before passing it to uspace.
349 *******************************************************************************/
350
351/** Do basic kernel processing of received call answer.
352 *
353 * @param call Call structure with the answer.
354 */
355static void process_answer(call_t *call)
356{
357 if (IPC_GET_RETVAL(call->data) == EHANGUP &&
358 (call->flags & IPC_CALL_FORWARDED))
359 IPC_SET_RETVAL(call->data, EFORWARD);
360
361 if (call->flags & IPC_CALL_CONN_ME_TO) {
362 if (IPC_GET_RETVAL(call->data))
363 phone_dealloc(call->priv);
364 else
365 IPC_SET_ARG5(call->data, call->priv);
366 }
367
368 if (call->buffer) {
369 /* This must be an affirmative answer to IPC_M_DATA_READ. */
370 uintptr_t dst = IPC_GET_ARG1(call->data);
371 size_t size = IPC_GET_ARG2(call->data);
372 int rc = copy_to_uspace((void *) dst, call->buffer, size);
373 if (rc)
374 IPC_SET_RETVAL(call->data, rc);
375 free(call->buffer);
376 call->buffer = NULL;
377 }
378}
379
380/** Do basic kernel processing of received call request.
381 *
382 * @param box Destination answerbox structure.
383 * @param call Call structure with the request.
384 *
385 * @return Return 0 if the call should be passed to userspace.
386 * Return -1 if the call should be ignored.
387 */
388static int process_request(answerbox_t *box, call_t *call)
389{
390 int phoneid;
391
392 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
393 phoneid = phone_alloc();
394 if (phoneid < 0) { /* Failed to allocate phone */
395 IPC_SET_RETVAL(call->data, ELIMIT);
396 ipc_answer(box, call);
397 return -1;
398 }
399 IPC_SET_ARG5(call->data, phoneid);
400 }
401 return 0;
402}
403
404/** Make a fast call over IPC, wait for reply and return to user.
405 *
406 * This function can handle only three arguments of payload, but is faster than
407 * the generic function (i.e. sys_ipc_call_sync_slow()).
408 *
409 * @param phoneid Phone handle for the call.
410 * @param method Method of the call.
411 * @param arg1 Service-defined payload argument.
412 * @param arg2 Service-defined payload argument.
413 * @param arg3 Service-defined payload argument.
414 * @param data Address of userspace structure where the reply call will
415 * be stored.
416 *
417 * @return Returns 0 on success.
418 * Return ENOENT if there is no such phone handle.
419 */
420unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
421 unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
422{
423 call_t call;
424 phone_t *phone;
425 int res;
426 int rc;
427
428 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
429
430 ipc_call_static_init(&call);
431 IPC_SET_METHOD(call.data, method);
432 IPC_SET_ARG1(call.data, arg1);
433 IPC_SET_ARG2(call.data, arg2);
434 IPC_SET_ARG3(call.data, arg3);
435 /*
436 * To achieve deterministic behavior, zero out arguments that are beyond
437 * the limits of the fast version.
438 */
439 IPC_SET_ARG4(call.data, 0);
440 IPC_SET_ARG5(call.data, 0);
441
442 if (!(res = request_preprocess(&call))) {
443 ipc_call_sync(phone, &call);
444 process_answer(&call);
445 } else {
446 IPC_SET_RETVAL(call.data, res);
447 }
448 rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
449 if (rc != 0)
450 return rc;
451
452 return 0;
453}
454
455/** Make a synchronous IPC call allowing to transmit the entire payload.
456 *
457 * @param phoneid Phone handle for the call.
458 * @param question Userspace address of call data with the request.
459 * @param reply Userspace address of call data where to store the
460 * answer.
461 *
462 * @return Zero on success or an error code.
463 */
464unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
465 ipc_data_t *reply)
466{
467 call_t call;
468 phone_t *phone;
469 int res;
470 int rc;
471
472 ipc_call_static_init(&call);
473 rc = copy_from_uspace(&call.data.args, &question->args,
474 sizeof(call.data.args));
475 if (rc != 0)
476 return (unative_t) rc;
477
478 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
479
480 if (!(res = request_preprocess(&call))) {
481 ipc_call_sync(phone, &call);
482 process_answer(&call);
483 } else
484 IPC_SET_RETVAL(call.data, res);
485
486 rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
487 if (rc != 0)
488 return rc;
489
490 return 0;
491}
492
493/** Check that the task did not exceed the allowed limit of asynchronous calls.
494 *
495 * @return Return 0 if limit not reached or -1 if limit exceeded.
496 */
497static int check_call_limit(void)
498{
499 if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
500 atomic_dec(&TASK->active_calls);
501 return -1;
502 }
503 return 0;
504}
505
506/** Make a fast asynchronous call over IPC.
507 *
508 * This function can only handle four arguments of payload, but is faster than
509 * the generic function sys_ipc_call_async_slow().
510 *
511 * @param phoneid Phone handle for the call.
512 * @param method Method of the call.
513 * @param arg1 Service-defined payload argument.
514 * @param arg2 Service-defined payload argument.
515 * @param arg3 Service-defined payload argument.
516 * @param arg4 Service-defined payload argument.
517 *
518 * @return Return call hash on success.
519 * Return IPC_CALLRET_FATAL in case of a fatal error and
520 * IPC_CALLRET_TEMPORARY if there are too many pending
521 * asynchronous requests; answers should be handled first.
522 */
523unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
524 unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
525{
526 call_t *call;
527 phone_t *phone;
528 int res;
529
530 if (check_call_limit())
531 return IPC_CALLRET_TEMPORARY;
532
533 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
534
535 call = ipc_call_alloc(0);
536 IPC_SET_METHOD(call->data, method);
537 IPC_SET_ARG1(call->data, arg1);
538 IPC_SET_ARG2(call->data, arg2);
539 IPC_SET_ARG3(call->data, arg3);
540 IPC_SET_ARG4(call->data, arg4);
541 /*
542 * To achieve deterministic behavior, zero out arguments that are beyond
543 * the limits of the fast version.
544 */
545 IPC_SET_ARG5(call->data, 0);
546
547 if (!(res = request_preprocess(call)))
548 ipc_call(phone, call);
549 else
550 ipc_backsend_err(phone, call, res);
551
552 return (unative_t) call;
553}
554
555/** Make an asynchronous IPC call allowing to transmit the entire payload.
556 *
557 * @param phoneid Phone handle for the call.
558 * @param data Userspace address of call data with the request.
559 *
560 * @return See sys_ipc_call_async_fast().
561 */
562unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data)
563{
564 call_t *call;
565 phone_t *phone;
566 int res;
567 int rc;
568
569 if (check_call_limit())
570 return IPC_CALLRET_TEMPORARY;
571
572 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
573
574 call = ipc_call_alloc(0);
575 rc = copy_from_uspace(&call->data.args, &data->args,
576 sizeof(call->data.args));
577 if (rc != 0) {
578 ipc_call_free(call);
579 return (unative_t) rc;
580 }
581 if (!(res = request_preprocess(call)))
582 ipc_call(phone, call);
583 else
584 ipc_backsend_err(phone, call, res);
585
586 return (unative_t) call;
587}
588
589/** Forward a received call to another destination.
590 *
591 * @param callid Hash of the call to forward.
592 * @param phoneid Phone handle to use for forwarding.
593 * @param method New method to use for the forwarded call.
594 * @param arg1 New value of the first argument for the forwarded call.
595 * @param arg2 New value of the second argument for the forwarded call.
596 * @param mode Flags that specify mode of the forward operation.
597 *
598 * @return Return 0 on succes, otherwise return an error code.
599 *
600 * In case the original method is a system method, ARG1, ARG2 and ARG3 are
601 * overwritten in the forwarded message with the new method and the new arg1 and
602 * arg2, respectively. Otherwise the METHOD, ARG1 and ARG2 are rewritten with
603 * the new method, arg1 and arg2, respectively. Also note there is a set of
604 * immutable methods, for which the new method and argument is not set and
605 * these values are ignored.
606 *
607 * Warning: When implementing support for changing additional payload
608 * arguments, make sure that ARG5 is not rewritten for certain
609 * system IPC
610 */
611unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
612 unative_t method, unative_t arg1, unative_t arg2, int mode)
613{
614 call_t *call;
615 phone_t *phone;
616
617 call = get_call(callid);
618 if (!call)
619 return ENOENT;
620
621 call->flags |= IPC_CALL_FORWARDED;
622
623 GET_CHECK_PHONE(phone, phoneid, {
624 IPC_SET_RETVAL(call->data, EFORWARD);
625 ipc_answer(&TASK->answerbox, call);
626 return ENOENT;
627 });
628
629 if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
630 IPC_SET_RETVAL(call->data, EFORWARD);
631 ipc_answer(&TASK->answerbox, call);
632 return EPERM;
633 }
634
635 /*
636 * Userspace is not allowed to change method of system methods on
637 * forward, allow changing ARG1, ARG2 and ARG3 by means of method,
638 * arg1 and arg2.
639 * If the method is immutable, don't change anything.
640 */
641 if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
642 if (method_is_system(IPC_GET_METHOD(call->data))) {
643 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
644 phone_dealloc(IPC_GET_ARG5(call->data));
645
646 IPC_SET_ARG1(call->data, method);
647 IPC_SET_ARG2(call->data, arg1);
648 IPC_SET_ARG3(call->data, arg2);
649 } else {
650 IPC_SET_METHOD(call->data, method);
651 IPC_SET_ARG1(call->data, arg1);
652 IPC_SET_ARG2(call->data, arg2);
653 }
654 }
655
656 return ipc_forward(call, phone, &TASK->answerbox, mode);
657}
658
659/** Answer an IPC call - fast version.
660 *
661 * This function can handle only two return arguments of payload, but is faster
662 * than the generic sys_ipc_answer().
663 *
664 * @param callid Hash of the call to be answered.
665 * @param retval Return value of the answer.
666 * @param arg1 Service-defined return value.
667 * @param arg2 Service-defined return value.
668 * @param arg3 Service-defined return value.
669 * @param arg4 Service-defined return value.
670 *
671 * @return Return 0 on success, otherwise return an error code.
672 */
673unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
674 unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
675{
676 call_t *call;
677 ipc_data_t saved_data;
678 int saveddata = 0;
679 int rc;
680
681 /* Do not answer notification callids */
682 if (callid & IPC_CALLID_NOTIFICATION)
683 return 0;
684
685 call = get_call(callid);
686 if (!call)
687 return ENOENT;
688
689 if (answer_need_old(call)) {
690 memcpy(&saved_data, &call->data, sizeof(call->data));
691 saveddata = 1;
692 }
693
694 IPC_SET_RETVAL(call->data, retval);
695 IPC_SET_ARG1(call->data, arg1);
696 IPC_SET_ARG2(call->data, arg2);
697 IPC_SET_ARG3(call->data, arg3);
698 IPC_SET_ARG4(call->data, arg4);
699 /*
700 * To achieve deterministic behavior, zero out arguments that are beyond
701 * the limits of the fast version.
702 */
703 IPC_SET_ARG5(call->data, 0);
704 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
705
706 ipc_answer(&TASK->answerbox, call);
707 return rc;
708}
709
710/** Answer an IPC call.
711 *
712 * @param callid Hash of the call to be answered.
713 * @param data Userspace address of call data with the answer.
714 *
715 * @return Return 0 on success, otherwise return an error code.
716 */
717unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data)
718{
719 call_t *call;
720 ipc_data_t saved_data;
721 int saveddata = 0;
722 int rc;
723
724 /* Do not answer notification callids */
725 if (callid & IPC_CALLID_NOTIFICATION)
726 return 0;
727
728 call = get_call(callid);
729 if (!call)
730 return ENOENT;
731
732 if (answer_need_old(call)) {
733 memcpy(&saved_data, &call->data, sizeof(call->data));
734 saveddata = 1;
735 }
736 rc = copy_from_uspace(&call->data.args, &data->args,
737 sizeof(call->data.args));
738 if (rc != 0)
739 return rc;
740
741 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
742
743 ipc_answer(&TASK->answerbox, call);
744
745 return rc;
746}
747
748/** Hang up a phone.
749 *
750 * @param Phone handle of the phone to be hung up.
751 *
752 * @return Return 0 on success or an error code.
753 */
754unative_t sys_ipc_hangup(int phoneid)
755{
756 phone_t *phone;
757
758 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
759
760 if (ipc_phone_hangup(phone))
761 return -1;
762
763 return 0;
764}
765
766/** Wait for an incoming IPC call or an answer.
767 *
768 * @param calldata Pointer to buffer where the call/answer data is stored.
769 * @param usec Timeout. See waitq_sleep_timeout() for explanation.
770 * @param flags Select mode of sleep operation. See waitq_sleep_timeout()
771 * for explanation.
772 *
773 * @return Hash of the call.
774 * If IPC_CALLID_NOTIFICATION bit is set in the hash, the
775 * call is a notification. IPC_CALLID_ANSWERED denotes an
776 * answer.
777 */
778unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
779{
780 call_t *call;
781
782restart:
783 call = ipc_wait_for_call(&TASK->answerbox, usec,
784 flags | SYNCH_FLAGS_INTERRUPTIBLE);
785 if (!call)
786 return 0;
787
788 if (call->flags & IPC_CALL_NOTIF) {
789 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
790
791 /* Set in_phone_hash to the interrupt counter */
792 call->data.phone = (void *) call->priv;
793
794 STRUCT_TO_USPACE(calldata, &call->data);
795
796 ipc_call_free(call);
797
798 return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
799 }
800
801 if (call->flags & IPC_CALL_ANSWERED) {
802 process_answer(call);
803
804 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
805
806 atomic_dec(&TASK->active_calls);
807
808 if (call->flags & IPC_CALL_DISCARD_ANSWER) {
809 ipc_call_free(call);
810 goto restart;
811 }
812
813 STRUCT_TO_USPACE(&calldata->args, &call->data.args);
814 ipc_call_free(call);
815
816 return ((unative_t) call) | IPC_CALLID_ANSWERED;
817 }
818
819 if (process_request(&TASK->answerbox, call))
820 goto restart;
821
822 /* Include phone address('id') of the caller in the request,
823 * copy whole call->data, not only call->data.args */
824 if (STRUCT_TO_USPACE(calldata, &call->data)) {
825 return 0;
826 }
827 return (unative_t)call;
828}
829
830/** Connect an IRQ handler to a task.
831 *
832 * @param inr IRQ number.
833 * @param devno Device number.
834 * @param method Method to be associated with the notification.
835 * @param ucode Uspace pointer to the top-half pseudocode.
836 *
837 * @return EPERM or a return code returned by ipc_irq_register().
838 */
839unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
840 irq_code_t *ucode)
841{
842 if (!(cap_get(TASK) & CAP_IRQ_REG))
843 return EPERM;
844
845 return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
846}
847
848/** Disconnect an IRQ handler from a task.
849 *
850 * @param inr IRQ number.
851 * @param devno Device number.
852 *
853 * @return Zero on success or EPERM on error..
854 */
855unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
856{
857 if (!(cap_get(TASK) & CAP_IRQ_REG))
858 return EPERM;
859
860 ipc_irq_unregister(&TASK->answerbox, inr, devno);
861
862 return 0;
863}
864
865/** @}
866 */
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