source: mainline/kernel/generic/src/ipc/sysipc.c@ 1a60feeb

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 1a60feeb was 1a60feeb, checked in by Jakub Jermar <jakub@…>, 17 years ago

Do not attempt to malloc() zero bytes of memory during VFS_READ at end of file.
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File size: 23.0 KB
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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_SHARE_OUT:
116 case IPC_M_SHARE_IN:
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_SHARE_OUT:
145 case IPC_M_SHARE_IN:
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 ((native_t) 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_SHARE_OUT) {
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_SHARE_IN) {
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 && 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 if (!size) {
262 IPC_SET_RETVAL(answer->data, EOK);
263 } else {
264 IPC_SET_RETVAL(answer->data, ELIMIT);
265 }
266 }
267 } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
268 ASSERT(answer->buffer);
269 if (!IPC_GET_RETVAL(answer->data)) {
270 /* The recipient agreed to receive data. */
271 int rc;
272 uintptr_t dst;
273 uintptr_t size;
274 uintptr_t max_size;
275
276 dst = IPC_GET_ARG1(answer->data);
277 size = IPC_GET_ARG2(answer->data);
278 max_size = IPC_GET_ARG2(*olddata);
279
280 if (size <= max_size) {
281 rc = copy_to_uspace((void *) dst,
282 answer->buffer, size);
283 if (rc)
284 IPC_SET_RETVAL(answer->data, rc);
285 } else {
286 IPC_SET_RETVAL(answer->data, ELIMIT);
287 }
288 }
289 free(answer->buffer);
290 answer->buffer = NULL;
291 }
292 return 0;
293}
294
295/** Called before the request is sent.
296 *
297 * @param call Call structure with the request.
298 *
299 * @return Return 0 on success, ELIMIT or EPERM on error.
300 */
301static int request_preprocess(call_t *call)
302{
303 int newphid;
304 size_t size;
305 uintptr_t src;
306 int rc;
307
308 switch (IPC_GET_METHOD(call->data)) {
309 case IPC_M_CONNECT_ME_TO:
310 newphid = phone_alloc();
311 if (newphid < 0)
312 return ELIMIT;
313 /* Set arg5 for server */
314 IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
315 call->flags |= IPC_CALL_CONN_ME_TO;
316 call->priv = newphid;
317 break;
318 case IPC_M_SHARE_OUT:
319 size = as_area_get_size(IPC_GET_ARG1(call->data));
320 if (!size)
321 return EPERM;
322 IPC_SET_ARG2(call->data, size);
323 break;
324 case IPC_M_DATA_READ:
325 size = IPC_GET_ARG2(call->data);
326 if ((size <= 0 || (size > DATA_XFER_LIMIT)))
327 return ELIMIT;
328 break;
329 case IPC_M_DATA_WRITE:
330 src = IPC_GET_ARG1(call->data);
331 size = IPC_GET_ARG2(call->data);
332
333 if ((size <= 0) || (size > DATA_XFER_LIMIT))
334 return ELIMIT;
335
336 call->buffer = (uint8_t *) malloc(size, 0);
337 rc = copy_from_uspace(call->buffer, (void *) src, size);
338 if (rc != 0) {
339 free(call->buffer);
340 return rc;
341 }
342 break;
343 default:
344 break;
345 }
346 return 0;
347}
348
349/*******************************************************************************
350 * Functions called to process received call/answer before passing it to uspace.
351 *******************************************************************************/
352
353/** Do basic kernel processing of received call answer.
354 *
355 * @param call Call structure with the answer.
356 */
357static void process_answer(call_t *call)
358{
359 if (((native_t) IPC_GET_RETVAL(call->data) == EHANGUP) &&
360 (call->flags & IPC_CALL_FORWARDED))
361 IPC_SET_RETVAL(call->data, EFORWARD);
362
363 if (call->flags & IPC_CALL_CONN_ME_TO) {
364 if (IPC_GET_RETVAL(call->data))
365 phone_dealloc(call->priv);
366 else
367 IPC_SET_ARG5(call->data, call->priv);
368 }
369
370 if (call->buffer) {
371 /* This must be an affirmative answer to IPC_M_DATA_READ. */
372 uintptr_t dst = IPC_GET_ARG1(call->data);
373 size_t size = IPC_GET_ARG2(call->data);
374 int rc = copy_to_uspace((void *) dst, call->buffer, size);
375 if (rc)
376 IPC_SET_RETVAL(call->data, rc);
377 free(call->buffer);
378 call->buffer = NULL;
379 }
380}
381
382/** Do basic kernel processing of received call request.
383 *
384 * @param box Destination answerbox structure.
385 * @param call Call structure with the request.
386 *
387 * @return Return 0 if the call should be passed to userspace.
388 * Return -1 if the call should be ignored.
389 */
390static int process_request(answerbox_t *box, call_t *call)
391{
392 int phoneid;
393
394 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
395 phoneid = phone_alloc();
396 if (phoneid < 0) { /* Failed to allocate phone */
397 IPC_SET_RETVAL(call->data, ELIMIT);
398 ipc_answer(box, call);
399 return -1;
400 }
401 IPC_SET_ARG5(call->data, phoneid);
402 }
403 return 0;
404}
405
406/** Make a fast call over IPC, wait for reply and return to user.
407 *
408 * This function can handle only three arguments of payload, but is faster than
409 * the generic function (i.e. sys_ipc_call_sync_slow()).
410 *
411 * @param phoneid Phone handle for the call.
412 * @param method Method of the call.
413 * @param arg1 Service-defined payload argument.
414 * @param arg2 Service-defined payload argument.
415 * @param arg3 Service-defined payload argument.
416 * @param data Address of userspace structure where the reply call will
417 * be stored.
418 *
419 * @return Returns 0 on success.
420 * Return ENOENT if there is no such phone handle.
421 */
422unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
423 unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
424{
425 call_t call;
426 phone_t *phone;
427 int res;
428 int rc;
429
430 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
431
432 ipc_call_static_init(&call);
433 IPC_SET_METHOD(call.data, method);
434 IPC_SET_ARG1(call.data, arg1);
435 IPC_SET_ARG2(call.data, arg2);
436 IPC_SET_ARG3(call.data, arg3);
437 /*
438 * To achieve deterministic behavior, zero out arguments that are beyond
439 * the limits of the fast version.
440 */
441 IPC_SET_ARG4(call.data, 0);
442 IPC_SET_ARG5(call.data, 0);
443
444 if (!(res = request_preprocess(&call))) {
445 ipc_call_sync(phone, &call);
446 process_answer(&call);
447 } else {
448 IPC_SET_RETVAL(call.data, res);
449 }
450 rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
451 if (rc != 0)
452 return rc;
453
454 return 0;
455}
456
457/** Make a synchronous IPC call allowing to transmit the entire payload.
458 *
459 * @param phoneid Phone handle for the call.
460 * @param question Userspace address of call data with the request.
461 * @param reply Userspace address of call data where to store the
462 * answer.
463 *
464 * @return Zero on success or an error code.
465 */
466unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
467 ipc_data_t *reply)
468{
469 call_t call;
470 phone_t *phone;
471 int res;
472 int rc;
473
474 ipc_call_static_init(&call);
475 rc = copy_from_uspace(&call.data.args, &question->args,
476 sizeof(call.data.args));
477 if (rc != 0)
478 return (unative_t) rc;
479
480 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
481
482 if (!(res = request_preprocess(&call))) {
483 ipc_call_sync(phone, &call);
484 process_answer(&call);
485 } else
486 IPC_SET_RETVAL(call.data, res);
487
488 rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
489 if (rc != 0)
490 return rc;
491
492 return 0;
493}
494
495/** Check that the task did not exceed the allowed limit of asynchronous calls.
496 *
497 * @return Return 0 if limit not reached or -1 if limit exceeded.
498 */
499static int check_call_limit(void)
500{
501 if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
502 atomic_dec(&TASK->active_calls);
503 return -1;
504 }
505 return 0;
506}
507
508/** Make a fast asynchronous call over IPC.
509 *
510 * This function can only handle four arguments of payload, but is faster than
511 * the generic function sys_ipc_call_async_slow().
512 *
513 * @param phoneid Phone handle for the call.
514 * @param method Method of the call.
515 * @param arg1 Service-defined payload argument.
516 * @param arg2 Service-defined payload argument.
517 * @param arg3 Service-defined payload argument.
518 * @param arg4 Service-defined payload argument.
519 *
520 * @return Return call hash on success.
521 * Return IPC_CALLRET_FATAL in case of a fatal error and
522 * IPC_CALLRET_TEMPORARY if there are too many pending
523 * asynchronous requests; answers should be handled first.
524 */
525unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
526 unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
527{
528 call_t *call;
529 phone_t *phone;
530 int res;
531
532 if (check_call_limit())
533 return IPC_CALLRET_TEMPORARY;
534
535 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
536
537 call = ipc_call_alloc(0);
538 IPC_SET_METHOD(call->data, method);
539 IPC_SET_ARG1(call->data, arg1);
540 IPC_SET_ARG2(call->data, arg2);
541 IPC_SET_ARG3(call->data, arg3);
542 IPC_SET_ARG4(call->data, arg4);
543 /*
544 * To achieve deterministic behavior, zero out arguments that are beyond
545 * the limits of the fast version.
546 */
547 IPC_SET_ARG5(call->data, 0);
548
549 if (!(res = request_preprocess(call)))
550 ipc_call(phone, call);
551 else
552 ipc_backsend_err(phone, call, res);
553
554 return (unative_t) call;
555}
556
557/** Make an asynchronous IPC call allowing to transmit the entire payload.
558 *
559 * @param phoneid Phone handle for the call.
560 * @param data Userspace address of call data with the request.
561 *
562 * @return See sys_ipc_call_async_fast().
563 */
564unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data)
565{
566 call_t *call;
567 phone_t *phone;
568 int res;
569 int rc;
570
571 if (check_call_limit())
572 return IPC_CALLRET_TEMPORARY;
573
574 GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
575
576 call = ipc_call_alloc(0);
577 rc = copy_from_uspace(&call->data.args, &data->args,
578 sizeof(call->data.args));
579 if (rc != 0) {
580 ipc_call_free(call);
581 return (unative_t) rc;
582 }
583 if (!(res = request_preprocess(call)))
584 ipc_call(phone, call);
585 else
586 ipc_backsend_err(phone, call, res);
587
588 return (unative_t) call;
589}
590
591/** Forward a received call to another destination.
592 *
593 * @param callid Hash of the call to forward.
594 * @param phoneid Phone handle to use for forwarding.
595 * @param method New method to use for the forwarded call.
596 * @param arg1 New value of the first argument for the forwarded call.
597 * @param arg2 New value of the second argument for the forwarded call.
598 * @param mode Flags that specify mode of the forward operation.
599 *
600 * @return Return 0 on succes, otherwise return an error code.
601 *
602 * In case the original method is a system method, ARG1, ARG2 and ARG3 are
603 * overwritten in the forwarded message with the new method and the new arg1 and
604 * arg2, respectively. Otherwise the METHOD, ARG1 and ARG2 are rewritten with
605 * the new method, arg1 and arg2, respectively. Also note there is a set of
606 * immutable methods, for which the new method and argument is not set and
607 * these values are ignored.
608 *
609 * Warning: When implementing support for changing additional payload
610 * arguments, make sure that ARG5 is not rewritten for certain
611 * system IPC
612 */
613unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
614 unative_t method, unative_t arg1, unative_t arg2, int mode)
615{
616 call_t *call;
617 phone_t *phone;
618
619 call = get_call(callid);
620 if (!call)
621 return ENOENT;
622
623 call->flags |= IPC_CALL_FORWARDED;
624
625 GET_CHECK_PHONE(phone, phoneid, {
626 IPC_SET_RETVAL(call->data, EFORWARD);
627 ipc_answer(&TASK->answerbox, call);
628 return ENOENT;
629 });
630
631 if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
632 IPC_SET_RETVAL(call->data, EFORWARD);
633 ipc_answer(&TASK->answerbox, call);
634 return EPERM;
635 }
636
637 /*
638 * Userspace is not allowed to change method of system methods on
639 * forward, allow changing ARG1, ARG2 and ARG3 by means of method,
640 * arg1 and arg2.
641 * If the method is immutable, don't change anything.
642 */
643 if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
644 if (method_is_system(IPC_GET_METHOD(call->data))) {
645 if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
646 phone_dealloc(IPC_GET_ARG5(call->data));
647
648 IPC_SET_ARG1(call->data, method);
649 IPC_SET_ARG2(call->data, arg1);
650 IPC_SET_ARG3(call->data, arg2);
651 } else {
652 IPC_SET_METHOD(call->data, method);
653 IPC_SET_ARG1(call->data, arg1);
654 IPC_SET_ARG2(call->data, arg2);
655 }
656 }
657
658 return ipc_forward(call, phone, &TASK->answerbox, mode);
659}
660
661/** Answer an IPC call - fast version.
662 *
663 * This function can handle only two return arguments of payload, but is faster
664 * than the generic sys_ipc_answer().
665 *
666 * @param callid Hash of the call to be answered.
667 * @param retval Return value of the answer.
668 * @param arg1 Service-defined return value.
669 * @param arg2 Service-defined return value.
670 * @param arg3 Service-defined return value.
671 * @param arg4 Service-defined return value.
672 *
673 * @return Return 0 on success, otherwise return an error code.
674 */
675unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
676 unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
677{
678 call_t *call;
679 ipc_data_t saved_data;
680 int saveddata = 0;
681 int rc;
682
683 /* Do not answer notification callids */
684 if (callid & IPC_CALLID_NOTIFICATION)
685 return 0;
686
687 call = get_call(callid);
688 if (!call)
689 return ENOENT;
690
691 if (answer_need_old(call)) {
692 memcpy(&saved_data, &call->data, sizeof(call->data));
693 saveddata = 1;
694 }
695
696 IPC_SET_RETVAL(call->data, retval);
697 IPC_SET_ARG1(call->data, arg1);
698 IPC_SET_ARG2(call->data, arg2);
699 IPC_SET_ARG3(call->data, arg3);
700 IPC_SET_ARG4(call->data, arg4);
701 /*
702 * To achieve deterministic behavior, zero out arguments that are beyond
703 * the limits of the fast version.
704 */
705 IPC_SET_ARG5(call->data, 0);
706 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
707
708 ipc_answer(&TASK->answerbox, call);
709 return rc;
710}
711
712/** Answer an IPC call.
713 *
714 * @param callid Hash of the call to be answered.
715 * @param data Userspace address of call data with the answer.
716 *
717 * @return Return 0 on success, otherwise return an error code.
718 */
719unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data)
720{
721 call_t *call;
722 ipc_data_t saved_data;
723 int saveddata = 0;
724 int rc;
725
726 /* Do not answer notification callids */
727 if (callid & IPC_CALLID_NOTIFICATION)
728 return 0;
729
730 call = get_call(callid);
731 if (!call)
732 return ENOENT;
733
734 if (answer_need_old(call)) {
735 memcpy(&saved_data, &call->data, sizeof(call->data));
736 saveddata = 1;
737 }
738 rc = copy_from_uspace(&call->data.args, &data->args,
739 sizeof(call->data.args));
740 if (rc != 0)
741 return rc;
742
743 rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
744
745 ipc_answer(&TASK->answerbox, call);
746
747 return rc;
748}
749
750/** Hang up a phone.
751 *
752 * @param Phone handle of the phone to be hung up.
753 *
754 * @return Return 0 on success or an error code.
755 */
756unative_t sys_ipc_hangup(int phoneid)
757{
758 phone_t *phone;
759
760 GET_CHECK_PHONE(phone, phoneid, return ENOENT);
761
762 if (ipc_phone_hangup(phone))
763 return -1;
764
765 return 0;
766}
767
768/** Wait for an incoming IPC call or an answer.
769 *
770 * @param calldata Pointer to buffer where the call/answer data is stored.
771 * @param usec Timeout. See waitq_sleep_timeout() for explanation.
772 * @param flags Select mode of sleep operation. See waitq_sleep_timeout()
773 * for explanation.
774 *
775 * @return Hash of the call.
776 * If IPC_CALLID_NOTIFICATION bit is set in the hash, the
777 * call is a notification. IPC_CALLID_ANSWERED denotes an
778 * answer.
779 */
780unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
781{
782 call_t *call;
783
784restart:
785 call = ipc_wait_for_call(&TASK->answerbox, usec,
786 flags | SYNCH_FLAGS_INTERRUPTIBLE);
787 if (!call)
788 return 0;
789
790 if (call->flags & IPC_CALL_NOTIF) {
791 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
792
793 /* Set in_phone_hash to the interrupt counter */
794 call->data.phone = (void *) call->priv;
795
796 STRUCT_TO_USPACE(calldata, &call->data);
797
798 ipc_call_free(call);
799
800 return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
801 }
802
803 if (call->flags & IPC_CALL_ANSWERED) {
804 process_answer(call);
805
806 ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
807
808 atomic_dec(&TASK->active_calls);
809
810 if (call->flags & IPC_CALL_DISCARD_ANSWER) {
811 ipc_call_free(call);
812 goto restart;
813 }
814
815 STRUCT_TO_USPACE(&calldata->args, &call->data.args);
816 ipc_call_free(call);
817
818 return ((unative_t) call) | IPC_CALLID_ANSWERED;
819 }
820
821 if (process_request(&TASK->answerbox, call))
822 goto restart;
823
824 /* Include phone address('id') of the caller in the request,
825 * copy whole call->data, not only call->data.args */
826 if (STRUCT_TO_USPACE(calldata, &call->data)) {
827 return 0;
828 }
829 return (unative_t)call;
830}
831
832/** Connect an IRQ handler to a task.
833 *
834 * @param inr IRQ number.
835 * @param devno Device number.
836 * @param method Method to be associated with the notification.
837 * @param ucode Uspace pointer to the top-half pseudocode.
838 *
839 * @return EPERM or a return code returned by ipc_irq_register().
840 */
841unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
842 irq_code_t *ucode)
843{
844 if (!(cap_get(TASK) & CAP_IRQ_REG))
845 return EPERM;
846
847 return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
848}
849
850/** Disconnect an IRQ handler from a task.
851 *
852 * @param inr IRQ number.
853 * @param devno Device number.
854 *
855 * @return Zero on success or EPERM on error..
856 */
857unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
858{
859 if (!(cap_get(TASK) & CAP_IRQ_REG))
860 return EPERM;
861
862 ipc_irq_unregister(&TASK->answerbox, inr, devno);
863
864 return 0;
865}
866
867/** @}
868 */
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