2
* Copyright (c) 2006 Ondrej Palkovsky
5
* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions
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.
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,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
/** @addtogroup genericipc
36
#include <proc/task.h>
37
#include <proc/thread.h>
42
#include <ipc/sysipc.h>
44
#include <ipc/ipcrsc.h>
46
#include <udebug/udebug_ipc.h>
47
#include <arch/interrupt.h>
48
#include <syscall/copy.h>
49
#include <security/cap.h>
54
* Maximum buffer size allowed for IPC_M_DATA_WRITE and IPC_M_DATA_READ
57
#define DATA_XFER_LIMIT (64 * 1024)
59
#define GET_CHECK_PHONE(phone, phoneid, err) \
61
if (phoneid > IPC_MAX_PHONES) { \
64
phone = &TASK->phones[phoneid]; \
67
#define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src)))
69
/** Decide if the method is a system method.
71
* @param method Method to be decided.
73
* @return Return 1 if the method is a system method.
76
static inline int method_is_system(unative_t method)
78
if (method <= IPC_M_LAST_SYSTEM)
83
/** Decide if the message with this method is forwardable.
85
* - some system messages may be forwarded, for some of them
88
* @param method Method to be decided.
90
* @return Return 1 if the method is forwardable.
93
static inline int method_is_forwardable(unative_t method)
96
case IPC_M_CONNECTION_CLONE:
97
case IPC_M_CONNECT_ME:
98
case IPC_M_PHONE_HUNGUP:
99
/* This message is meant only for the original recipient. */
106
/** Decide if the message with this method is immutable on forward.
108
* - some system messages may be forwarded but their content cannot be altered
110
* @param method Method to be decided.
112
* @return Return 1 if the method is immutable on forward.
113
* Otherwise return 0.
115
static inline int method_is_immutable(unative_t method)
118
case IPC_M_SHARE_OUT:
120
case IPC_M_DATA_WRITE:
121
case IPC_M_DATA_READ:
130
/***********************************************************************
131
* Functions that preprocess answer before sending it to the recepient.
132
***********************************************************************/
134
/** Decide if the caller (e.g. ipc_answer()) should save the old call contents
135
* for answer_preprocess().
137
* @param call Call structure to be decided.
139
* @return Return 1 if the old call contents should be saved.
140
* Return 0 otherwise.
142
static inline int answer_need_old(call_t *call)
144
switch (IPC_GET_METHOD(call->data)) {
145
case IPC_M_CONNECTION_CLONE:
146
case IPC_M_CONNECT_ME:
147
case IPC_M_CONNECT_TO_ME:
148
case IPC_M_CONNECT_ME_TO:
149
case IPC_M_SHARE_OUT:
151
case IPC_M_DATA_WRITE:
152
case IPC_M_DATA_READ:
159
/** Interpret process answer as control information.
161
* This function is called directly after sys_ipc_answer().
163
* @param answer Call structure with the answer.
164
* @param olddata Saved data of the request.
166
* @return Return 0 on success or an error code.
168
static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
172
if ((native_t) IPC_GET_RETVAL(answer->data) == EHANGUP) {
173
/* In case of forward, hangup the forwared phone,
176
mutex_lock(&answer->data.phone->lock);
177
spinlock_lock(&TASK->answerbox.lock);
178
if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
179
list_remove(&answer->data.phone->link);
180
answer->data.phone->state = IPC_PHONE_SLAMMED;
182
spinlock_unlock(&TASK->answerbox.lock);
183
mutex_unlock(&answer->data.phone->lock);
189
if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECTION_CLONE) {
190
phoneid = IPC_GET_ARG1(*olddata);
191
phone_t *phone = &TASK->phones[phoneid];
192
if (IPC_GET_RETVAL(answer->data) != EOK) {
194
* The recipient of the cloned phone rejected the offer.
195
* In this case, the connection was established at the
196
* request time and therefore we need to slam the phone.
197
* We don't merely hangup as that would result in
198
* sending IPC_M_HUNGUP to the third party on the
199
* other side of the cloned phone.
201
mutex_lock(&phone->lock);
202
if (phone->state == IPC_PHONE_CONNECTED) {
203
spinlock_lock(&phone->callee->lock);
204
list_remove(&phone->link);
205
phone->state = IPC_PHONE_SLAMMED;
206
spinlock_unlock(&phone->callee->lock);
208
mutex_unlock(&phone->lock);
210
} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME) {
211
phone_t *phone = (phone_t *)IPC_GET_ARG5(*olddata);
212
if (IPC_GET_RETVAL(answer->data) != EOK) {
214
* The other party on the cloned phoned rejected our
215
* request for connection on the protocol level.
216
* We need to break the connection without sending
219
mutex_lock(&phone->lock);
220
if (phone->state == IPC_PHONE_CONNECTED) {
221
spinlock_lock(&phone->callee->lock);
222
list_remove(&phone->link);
223
phone->state = IPC_PHONE_SLAMMED;
224
spinlock_unlock(&phone->callee->lock);
226
mutex_unlock(&phone->lock);
228
} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
229
phoneid = IPC_GET_ARG5(*olddata);
230
if (IPC_GET_RETVAL(answer->data) != EOK) {
231
/* The connection was not accepted */
232
phone_dealloc(phoneid);
234
/* The connection was accepted */
235
phone_connect(phoneid, &answer->sender->answerbox);
236
/* Set 'phone hash' as arg5 of response */
237
IPC_SET_ARG5(answer->data,
238
(unative_t) &TASK->phones[phoneid]);
240
} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
241
/* If the users accepted call, connect */
242
if (IPC_GET_RETVAL(answer->data) == EOK) {
243
ipc_phone_connect((phone_t *) IPC_GET_ARG5(*olddata),
246
} else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_OUT) {
247
if (!IPC_GET_RETVAL(answer->data)) {
248
/* Accepted, handle as_area receipt */
253
ipl = interrupts_disable();
254
spinlock_lock(&answer->sender->lock);
255
as = answer->sender->as;
256
spinlock_unlock(&answer->sender->lock);
257
interrupts_restore(ipl);
259
rc = as_area_share(as, IPC_GET_ARG1(*olddata),
260
IPC_GET_ARG2(*olddata), AS,
261
IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
262
IPC_SET_RETVAL(answer->data, rc);
265
} else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_IN) {
266
if (!IPC_GET_RETVAL(answer->data)) {
271
ipl = interrupts_disable();
272
spinlock_lock(&answer->sender->lock);
273
as = answer->sender->as;
274
spinlock_unlock(&answer->sender->lock);
275
interrupts_restore(ipl);
277
rc = as_area_share(AS, IPC_GET_ARG1(answer->data),
278
IPC_GET_ARG2(*olddata), as, IPC_GET_ARG1(*olddata),
279
IPC_GET_ARG2(answer->data));
280
IPC_SET_RETVAL(answer->data, rc);
282
} else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_READ) {
283
ASSERT(!answer->buffer);
284
if (!IPC_GET_RETVAL(answer->data)) {
285
/* The recipient agreed to send data. */
286
uintptr_t src = IPC_GET_ARG1(answer->data);
287
uintptr_t dst = IPC_GET_ARG1(*olddata);
288
size_t max_size = IPC_GET_ARG2(*olddata);
289
size_t size = IPC_GET_ARG2(answer->data);
290
if (size && size <= max_size) {
292
* Copy the destination VA so that this piece of
293
* information is not lost.
295
IPC_SET_ARG1(answer->data, dst);
297
answer->buffer = malloc(size, 0);
298
int rc = copy_from_uspace(answer->buffer,
301
IPC_SET_RETVAL(answer->data, rc);
302
free(answer->buffer);
303
answer->buffer = NULL;
306
IPC_SET_RETVAL(answer->data, EOK);
308
IPC_SET_RETVAL(answer->data, ELIMIT);
311
} else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
312
ASSERT(answer->buffer);
313
if (!IPC_GET_RETVAL(answer->data)) {
314
/* The recipient agreed to receive data. */
320
dst = (uintptr_t)IPC_GET_ARG1(answer->data);
321
size = (size_t)IPC_GET_ARG2(answer->data);
322
max_size = (size_t)IPC_GET_ARG2(*olddata);
324
if (size <= max_size) {
325
rc = copy_to_uspace((void *) dst,
326
answer->buffer, size);
328
IPC_SET_RETVAL(answer->data, rc);
330
IPC_SET_RETVAL(answer->data, ELIMIT);
333
free(answer->buffer);
334
answer->buffer = NULL;
339
static void phones_lock(phone_t *p1, phone_t *p2)
342
mutex_lock(&p1->lock);
343
mutex_lock(&p2->lock);
344
} else if (p1 > p2) {
345
mutex_lock(&p2->lock);
346
mutex_lock(&p1->lock);
348
mutex_lock(&p1->lock);
352
static void phones_unlock(phone_t *p1, phone_t *p2)
354
mutex_unlock(&p1->lock);
356
mutex_unlock(&p2->lock);
359
/** Called before the request is sent.
361
* @param call Call structure with the request.
362
* @param phone Phone that the call will be sent through.
364
* @return Return 0 on success, ELIMIT or EPERM on error.
366
static int request_preprocess(call_t *call, phone_t *phone)
373
switch (IPC_GET_METHOD(call->data)) {
374
case IPC_M_CONNECTION_CLONE: {
375
phone_t *cloned_phone;
376
GET_CHECK_PHONE(cloned_phone, IPC_GET_ARG1(call->data),
378
phones_lock(cloned_phone, phone);
379
if ((cloned_phone->state != IPC_PHONE_CONNECTED) ||
380
phone->state != IPC_PHONE_CONNECTED) {
381
phones_unlock(cloned_phone, phone);
385
* We can be pretty sure now that both tasks exist and we are
386
* connected to them. As we continue to hold the phone locks,
387
* we are effectively preventing them from finishing their
390
newphid = phone_alloc(phone->callee->task);
392
phones_unlock(cloned_phone, phone);
395
ipc_phone_connect(&phone->callee->task->phones[newphid],
396
cloned_phone->callee);
397
phones_unlock(cloned_phone, phone);
398
/* Set the new phone for the callee. */
399
IPC_SET_ARG1(call->data, newphid);
402
case IPC_M_CONNECT_ME:
403
IPC_SET_ARG5(call->data, (unative_t) phone);
405
case IPC_M_CONNECT_ME_TO:
406
newphid = phone_alloc(TASK);
409
/* Set arg5 for server */
410
IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
411
call->flags |= IPC_CALL_CONN_ME_TO;
412
call->priv = newphid;
414
case IPC_M_SHARE_OUT:
415
size = as_area_get_size(IPC_GET_ARG1(call->data));
418
IPC_SET_ARG2(call->data, size);
420
case IPC_M_DATA_READ:
421
size = IPC_GET_ARG2(call->data);
422
if ((size <= 0 || (size > DATA_XFER_LIMIT)))
425
case IPC_M_DATA_WRITE:
426
src = IPC_GET_ARG1(call->data);
427
size = IPC_GET_ARG2(call->data);
429
if (size > DATA_XFER_LIMIT)
432
call->buffer = (uint8_t *) malloc(size, 0);
433
rc = copy_from_uspace(call->buffer, (void *) src, size);
440
case IPC_M_DEBUG_ALL:
441
return udebug_request_preprocess(call, phone);
449
/*******************************************************************************
450
* Functions called to process received call/answer before passing it to uspace.
451
*******************************************************************************/
453
/** Do basic kernel processing of received call answer.
455
* @param call Call structure with the answer.
457
static void process_answer(call_t *call)
459
if (((native_t) IPC_GET_RETVAL(call->data) == EHANGUP) &&
460
(call->flags & IPC_CALL_FORWARDED))
461
IPC_SET_RETVAL(call->data, EFORWARD);
463
if (call->flags & IPC_CALL_CONN_ME_TO) {
464
if (IPC_GET_RETVAL(call->data))
465
phone_dealloc(call->priv);
467
IPC_SET_ARG5(call->data, call->priv);
471
/* This must be an affirmative answer to IPC_M_DATA_READ. */
472
/* or IPC_M_DEBUG_ALL/UDEBUG_M_MEM_READ... */
473
uintptr_t dst = IPC_GET_ARG1(call->data);
474
size_t size = IPC_GET_ARG2(call->data);
475
int rc = copy_to_uspace((void *) dst, call->buffer, size);
477
IPC_SET_RETVAL(call->data, rc);
483
/** Do basic kernel processing of received call request.
485
* @param box Destination answerbox structure.
486
* @param call Call structure with the request.
488
* @return Return 0 if the call should be passed to userspace.
489
* Return -1 if the call should be ignored.
491
static int process_request(answerbox_t *box, call_t *call)
495
if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
496
phoneid = phone_alloc(TASK);
497
if (phoneid < 0) { /* Failed to allocate phone */
498
IPC_SET_RETVAL(call->data, ELIMIT);
499
ipc_answer(box, call);
502
IPC_SET_ARG5(call->data, phoneid);
504
switch (IPC_GET_METHOD(call->data)) {
505
case IPC_M_DEBUG_ALL:
513
/** Make a fast call over IPC, wait for reply and return to user.
515
* This function can handle only three arguments of payload, but is faster than
516
* the generic function (i.e. sys_ipc_call_sync_slow()).
518
* @param phoneid Phone handle for the call.
519
* @param method Method of the call.
520
* @param arg1 Service-defined payload argument.
521
* @param arg2 Service-defined payload argument.
522
* @param arg3 Service-defined payload argument.
523
* @param data Address of userspace structure where the reply call will
526
* @return Returns 0 on success.
527
* Return ENOENT if there is no such phone handle.
529
unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
530
unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
537
GET_CHECK_PHONE(phone, phoneid, return ENOENT);
539
ipc_call_static_init(&call);
540
IPC_SET_METHOD(call.data, method);
541
IPC_SET_ARG1(call.data, arg1);
542
IPC_SET_ARG2(call.data, arg2);
543
IPC_SET_ARG3(call.data, arg3);
545
* To achieve deterministic behavior, zero out arguments that are beyond
546
* the limits of the fast version.
548
IPC_SET_ARG4(call.data, 0);
549
IPC_SET_ARG5(call.data, 0);
551
if (!(res = request_preprocess(&call, phone))) {
553
udebug_stoppable_begin();
555
rc = ipc_call_sync(phone, &call);
557
udebug_stoppable_end();
561
process_answer(&call);
564
IPC_SET_RETVAL(call.data, res);
566
rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
573
/** Make a synchronous IPC call allowing to transmit the entire payload.
575
* @param phoneid Phone handle for the call.
576
* @param question Userspace address of call data with the request.
577
* @param reply Userspace address of call data where to store the
580
* @return Zero on success or an error code.
582
unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
590
ipc_call_static_init(&call);
591
rc = copy_from_uspace(&call.data.args, &question->args,
592
sizeof(call.data.args));
594
return (unative_t) rc;
596
GET_CHECK_PHONE(phone, phoneid, return ENOENT);
598
if (!(res = request_preprocess(&call, phone))) {
600
udebug_stoppable_begin();
602
rc = ipc_call_sync(phone, &call);
604
udebug_stoppable_end();
608
process_answer(&call);
610
IPC_SET_RETVAL(call.data, res);
612
rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
619
/** Check that the task did not exceed the allowed limit of asynchronous calls.
621
* @return Return 0 if limit not reached or -1 if limit exceeded.
623
static int check_call_limit(void)
625
if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
626
atomic_dec(&TASK->active_calls);
632
/** Make a fast asynchronous call over IPC.
634
* This function can only handle four arguments of payload, but is faster than
635
* the generic function sys_ipc_call_async_slow().
637
* @param phoneid Phone handle for the call.
638
* @param method Method of the call.
639
* @param arg1 Service-defined payload argument.
640
* @param arg2 Service-defined payload argument.
641
* @param arg3 Service-defined payload argument.
642
* @param arg4 Service-defined payload argument.
644
* @return Return call hash on success.
645
* Return IPC_CALLRET_FATAL in case of a fatal error and
646
* IPC_CALLRET_TEMPORARY if there are too many pending
647
* asynchronous requests; answers should be handled first.
649
unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
650
unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
656
if (check_call_limit())
657
return IPC_CALLRET_TEMPORARY;
659
GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
661
call = ipc_call_alloc(0);
662
IPC_SET_METHOD(call->data, method);
663
IPC_SET_ARG1(call->data, arg1);
664
IPC_SET_ARG2(call->data, arg2);
665
IPC_SET_ARG3(call->data, arg3);
666
IPC_SET_ARG4(call->data, arg4);
668
* To achieve deterministic behavior, zero out arguments that are beyond
669
* the limits of the fast version.
671
IPC_SET_ARG5(call->data, 0);
673
if (!(res = request_preprocess(call, phone)))
674
ipc_call(phone, call);
676
ipc_backsend_err(phone, call, res);
678
return (unative_t) call;
681
/** Make an asynchronous IPC call allowing to transmit the entire payload.
683
* @param phoneid Phone handle for the call.
684
* @param data Userspace address of call data with the request.
686
* @return See sys_ipc_call_async_fast().
688
unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data)
695
if (check_call_limit())
696
return IPC_CALLRET_TEMPORARY;
698
GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
700
call = ipc_call_alloc(0);
701
rc = copy_from_uspace(&call->data.args, &data->args,
702
sizeof(call->data.args));
705
return (unative_t) rc;
707
if (!(res = request_preprocess(call, phone)))
708
ipc_call(phone, call);
710
ipc_backsend_err(phone, call, res);
712
return (unative_t) call;
715
/** Forward a received call to another destination - common code for both the
716
* fast and the slow version.
718
* @param callid Hash of the call to forward.
719
* @param phoneid Phone handle to use for forwarding.
720
* @param method New method to use for the forwarded call.
721
* @param arg1 New value of the first argument for the forwarded call.
722
* @param arg2 New value of the second argument for the forwarded call.
723
* @param arg3 New value of the third argument for the forwarded call.
724
* @param arg4 New value of the fourth argument for the forwarded call.
725
* @param arg5 New value of the fifth argument for the forwarded call.
726
* @param mode Flags that specify mode of the forward operation.
727
* @param slow If true, arg3, arg4 and arg5 are considered. Otherwise
728
* the function considers only the fast version arguments:
729
* i.e. arg1 and arg2.
731
* @return Return 0 on succes, otherwise return an error code.
733
* Warning: Make sure that ARG5 is not rewritten for certain system IPC
735
static unative_t sys_ipc_forward_common(unative_t callid, unative_t phoneid,
736
unative_t method, unative_t arg1, unative_t arg2, unative_t arg3,
737
unative_t arg4, unative_t arg5, int mode, bool slow)
742
call = get_call(callid);
746
call->flags |= IPC_CALL_FORWARDED;
748
GET_CHECK_PHONE(phone, phoneid, {
749
IPC_SET_RETVAL(call->data, EFORWARD);
750
ipc_answer(&TASK->answerbox, call);
754
if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
755
IPC_SET_RETVAL(call->data, EFORWARD);
756
ipc_answer(&TASK->answerbox, call);
761
* Userspace is not allowed to change method of system methods on
762
* forward, allow changing ARG1, ARG2, ARG3 and ARG4 by means of method,
763
* arg1, arg2 and arg3.
764
* If the method is immutable, don't change anything.
766
if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
767
if (method_is_system(IPC_GET_METHOD(call->data))) {
768
if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
769
phone_dealloc(IPC_GET_ARG5(call->data));
771
IPC_SET_ARG1(call->data, method);
772
IPC_SET_ARG2(call->data, arg1);
773
IPC_SET_ARG3(call->data, arg2);
775
IPC_SET_ARG4(call->data, arg3);
777
* For system methods we deliberately don't
782
IPC_SET_METHOD(call->data, method);
783
IPC_SET_ARG1(call->data, arg1);
784
IPC_SET_ARG2(call->data, arg2);
786
IPC_SET_ARG3(call->data, arg3);
787
IPC_SET_ARG4(call->data, arg4);
788
IPC_SET_ARG5(call->data, arg5);
793
return ipc_forward(call, phone, &TASK->answerbox, mode);
796
/** Forward a received call to another destination - fast version.
798
* @param callid Hash of the call to forward.
799
* @param phoneid Phone handle to use for forwarding.
800
* @param method New method to use for the forwarded call.
801
* @param arg1 New value of the first argument for the forwarded call.
802
* @param arg2 New value of the second argument for the forwarded call.
803
* @param mode Flags that specify mode of the forward operation.
805
* @return Return 0 on succes, otherwise return an error code.
807
* In case the original method is a system method, ARG1, ARG2 and ARG3 are
808
* overwritten in the forwarded message with the new method and the new
809
* arg1 and arg2, respectively. Otherwise the METHOD, ARG1 and ARG2 are
810
* rewritten with the new method, arg1 and arg2, respectively. Also note there
811
* is a set of immutable methods, for which the new method and arguments are not
812
* set and these values are ignored.
814
unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
815
unative_t method, unative_t arg1, unative_t arg2, int mode)
817
return sys_ipc_forward_common(callid, phoneid, method, arg1, arg2, 0, 0,
821
/** Forward a received call to another destination - slow version.
823
* @param callid Hash of the call to forward.
824
* @param phoneid Phone handle to use for forwarding.
825
* @param data Userspace address of the new IPC data.
826
* @param mode Flags that specify mode of the forward operation.
828
* @return Return 0 on succes, otherwise return an error code.
830
* This function is the slow verision of the sys_ipc_forward_fast interface.
831
* It can copy all five new arguments and the new method from the userspace.
832
* It naturally extends the functionality of the fast version. For system
833
* methods, it additionally stores the new value of arg3 to ARG4. For non-system
834
* methods, it additionally stores the new value of arg3, arg4 and arg5,
835
* respectively, to ARG3, ARG4 and ARG5, respectively.
837
unative_t sys_ipc_forward_slow(unative_t callid, unative_t phoneid,
838
ipc_data_t *data, int mode)
843
rc = copy_from_uspace(&newdata.args, &data->args,
844
sizeof(newdata.args));
846
return (unative_t) rc;
848
return sys_ipc_forward_common(callid, phoneid,
849
IPC_GET_METHOD(newdata), IPC_GET_ARG1(newdata),
850
IPC_GET_ARG2(newdata), IPC_GET_ARG3(newdata),
851
IPC_GET_ARG4(newdata), IPC_GET_ARG5(newdata), mode, true);
854
/** Answer an IPC call - fast version.
856
* This function can handle only two return arguments of payload, but is faster
857
* than the generic sys_ipc_answer().
859
* @param callid Hash of the call to be answered.
860
* @param retval Return value of the answer.
861
* @param arg1 Service-defined return value.
862
* @param arg2 Service-defined return value.
863
* @param arg3 Service-defined return value.
864
* @param arg4 Service-defined return value.
866
* @return Return 0 on success, otherwise return an error code.
868
unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
869
unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
872
ipc_data_t saved_data;
876
/* Do not answer notification callids */
877
if (callid & IPC_CALLID_NOTIFICATION)
880
call = get_call(callid);
884
if (answer_need_old(call)) {
885
memcpy(&saved_data, &call->data, sizeof(call->data));
889
IPC_SET_RETVAL(call->data, retval);
890
IPC_SET_ARG1(call->data, arg1);
891
IPC_SET_ARG2(call->data, arg2);
892
IPC_SET_ARG3(call->data, arg3);
893
IPC_SET_ARG4(call->data, arg4);
895
* To achieve deterministic behavior, zero out arguments that are beyond
896
* the limits of the fast version.
898
IPC_SET_ARG5(call->data, 0);
899
rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
901
ipc_answer(&TASK->answerbox, call);
905
/** Answer an IPC call.
907
* @param callid Hash of the call to be answered.
908
* @param data Userspace address of call data with the answer.
910
* @return Return 0 on success, otherwise return an error code.
912
unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data)
915
ipc_data_t saved_data;
919
/* Do not answer notification callids */
920
if (callid & IPC_CALLID_NOTIFICATION)
923
call = get_call(callid);
927
if (answer_need_old(call)) {
928
memcpy(&saved_data, &call->data, sizeof(call->data));
931
rc = copy_from_uspace(&call->data.args, &data->args,
932
sizeof(call->data.args));
936
rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
938
ipc_answer(&TASK->answerbox, call);
945
* @param Phone handle of the phone to be hung up.
947
* @return Return 0 on success or an error code.
949
unative_t sys_ipc_hangup(int phoneid)
953
GET_CHECK_PHONE(phone, phoneid, return ENOENT);
955
if (ipc_phone_hangup(phone))
961
/** Wait for an incoming IPC call or an answer.
963
* @param calldata Pointer to buffer where the call/answer data is stored.
964
* @param usec Timeout. See waitq_sleep_timeout() for explanation.
965
* @param flags Select mode of sleep operation. See waitq_sleep_timeout()
968
* @return Hash of the call.
969
* If IPC_CALLID_NOTIFICATION bit is set in the hash, the
970
* call is a notification. IPC_CALLID_ANSWERED denotes an
973
unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
980
udebug_stoppable_begin();
982
call = ipc_wait_for_call(&TASK->answerbox, usec,
983
flags | SYNCH_FLAGS_INTERRUPTIBLE);
986
udebug_stoppable_end();
991
if (call->flags & IPC_CALL_NOTIF) {
992
ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
994
/* Set in_phone_hash to the interrupt counter */
995
call->data.phone = (void *) call->priv;
997
STRUCT_TO_USPACE(calldata, &call->data);
1001
return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
1004
if (call->flags & IPC_CALL_ANSWERED) {
1005
process_answer(call);
1007
ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
1009
if (call->flags & IPC_CALL_DISCARD_ANSWER) {
1010
ipc_call_free(call);
1014
* Decrement the counter of active calls only if the
1015
* call is not an answer to IPC_M_PHONE_HUNGUP,
1016
* which doesn't contribute to the counter.
1018
atomic_dec(&TASK->active_calls);
1021
STRUCT_TO_USPACE(&calldata->args, &call->data.args);
1022
ipc_call_free(call);
1024
return ((unative_t) call) | IPC_CALLID_ANSWERED;
1027
if (process_request(&TASK->answerbox, call))
1030
/* Include phone address('id') of the caller in the request,
1031
* copy whole call->data, not only call->data.args */
1032
if (STRUCT_TO_USPACE(calldata, &call->data)) {
1034
* The callee will not receive this call and no one else has
1035
* a chance to answer it. Reply with the EPARTY error code.
1037
ipc_data_t saved_data;
1040
if (answer_need_old(call)) {
1041
memcpy(&saved_data, &call->data, sizeof(call->data));
1045
IPC_SET_RETVAL(call->data, EPARTY);
1046
(void) answer_preprocess(call, saveddata ? &saved_data : NULL);
1047
ipc_answer(&TASK->answerbox, call);
1050
return (unative_t)call;
1053
/** Connect an IRQ handler to a task.
1055
* @param inr IRQ number.
1056
* @param devno Device number.
1057
* @param method Method to be associated with the notification.
1058
* @param ucode Uspace pointer to the top-half pseudocode.
1060
* @return EPERM or a return code returned by ipc_irq_register().
1062
unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
1065
if (!(cap_get(TASK) & CAP_IRQ_REG))
1068
return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
1071
/** Disconnect an IRQ handler from a task.
1073
* @param inr IRQ number.
1074
* @param devno Device number.
1076
* @return Zero on success or EPERM on error..
1078
unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
1080
if (!(cap_get(TASK) & CAP_IRQ_REG))
1083
ipc_irq_unregister(&TASK->answerbox, inr, devno);
1088
#include <console/console.h>
1091
* Syscall connect to a task by id.
1093
* @return Phone id on success, or negative error code.
1095
unative_t sys_ipc_connect_kbox(sysarg64_t *uspace_taskid_arg)
1097
#ifdef CONFIG_UDEBUG
1098
sysarg64_t taskid_arg;
1101
rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t));
1103
return (unative_t) rc;
1105
LOG("sys_ipc_connect_kbox(%" PRIu64 ")\n", taskid_arg.value);
1107
return ipc_connect_kbox(taskid_arg.value);
1109
return (unative_t) ENOTSUP;