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1027 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Ondrej Palkovsky
1027 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
 
1757 jermar 29
/** @addtogroup genericipc
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1027 palkovsky 35
#include <arch.h>
36
#include <proc/task.h>
1288 jermar 37
#include <proc/thread.h>
1027 palkovsky 38
#include <errno.h>
39
#include <memstr.h>
40
#include <debug.h>
41
#include <ipc/ipc.h>
42
#include <ipc/sysipc.h>
1281 palkovsky 43
#include <ipc/irq.h>
1072 palkovsky 44
#include <ipc/ipcrsc.h>
1258 palkovsky 45
#include <arch/interrupt.h>
1027 palkovsky 46
#include <print.h>
1288 jermar 47
#include <syscall/copy.h>
1297 jermar 48
#include <security/cap.h>
1329 palkovsky 49
#include <mm/as.h>
1875 jermar 50
#include <print.h>
1027 palkovsky 51
 
2660 jermar 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)
2494 jermar 57
 
2471 jermar 58
#define GET_CHECK_PHONE(phone, phoneid, err) \
59
{ \
60
    if (phoneid > IPC_MAX_PHONES) { \
61
        err; \
62
    } \
63
    phone = &TASK->phones[phoneid]; \
1084 palkovsky 64
}
65
 
2471 jermar 66
#define STRUCT_TO_USPACE(dst, src)  copy_to_uspace(dst, src, sizeof(*(src)))
1084 palkovsky 67
 
2471 jermar 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
 */
2557 jermar 75
static inline int method_is_system(unative_t method)
1040 palkovsky 76
{
77
    if (method <= IPC_M_LAST_SYSTEM)
78
        return 1;
79
    return 0;
80
}
81
 
2471 jermar 82
/** Decide if the message with this method is forwardable.
1040 palkovsky 83
 *
84
 * - some system messages may be forwarded, for some of them
85
 *   it is useless
2471 jermar 86
 *
87
 * @param method    Method to be decided.
88
 *
89
 * @return      Return 1 if the method is forwardable.
90
 *          Otherwise return 0.
1040 palkovsky 91
 */
2557 jermar 92
static inline int method_is_forwardable(unative_t method)
1040 palkovsky 93
{
2494 jermar 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
    }
1040 palkovsky 101
}
102
 
2557 jermar 103
/** Decide if the message with this method is immutable on forward.
104
 *
2601 jermar 105
 * - some system messages may be forwarded but their content cannot be altered
2557 jermar 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
 */
112
static inline int method_is_immutable(unative_t method)
113
{
114
    switch (method) {
2677 jermar 115
    case IPC_M_SHARE_OUT:
116
    case IPC_M_SHARE_IN:
2660 jermar 117
    case IPC_M_DATA_WRITE:
118
    case IPC_M_DATA_READ:
2557 jermar 119
        return 1;
120
        break;
121
    default:
122
        return 0;
123
    }
124
}
1027 palkovsky 125
 
2557 jermar 126
 
2471 jermar 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.
1027 palkovsky 138
 */
1088 palkovsky 139
static inline int answer_need_old(call_t *call)
1027 palkovsky 140
{
2494 jermar 141
    switch (IPC_GET_METHOD(call->data)) {
142
    case IPC_M_CONNECT_TO_ME:
143
    case IPC_M_CONNECT_ME_TO:
2677 jermar 144
    case IPC_M_SHARE_OUT:
145
    case IPC_M_SHARE_IN:
2660 jermar 146
    case IPC_M_DATA_WRITE:
147
    case IPC_M_DATA_READ:
1027 palkovsky 148
        return 1;
2494 jermar 149
    default:
150
        return 0;
151
    }
1027 palkovsky 152
}
153
 
2471 jermar 154
/** Interpret process answer as control information.
1428 palkovsky 155
 *
2471 jermar 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.
1428 palkovsky 162
 */
1329 palkovsky 163
static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
1027 palkovsky 164
{
165
    int phoneid;
166
 
2745 decky 167
    if ((native_t) IPC_GET_RETVAL(answer->data) == EHANGUP) {
1141 palkovsky 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);
1568 palkovsky 173
        if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
1573 palkovsky 174
            list_remove(&answer->data.phone->link);
1568 palkovsky 175
            answer->data.phone->state = IPC_PHONE_SLAMMED;
1141 palkovsky 176
        }
177
        spinlock_unlock(&TASK->answerbox.lock);
178
        spinlock_unlock(&answer->data.phone->lock);
1088 palkovsky 179
    }
180
 
181
    if (!olddata)
1329 palkovsky 182
        return 0;
1088 palkovsky 183
 
1086 palkovsky 184
    if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
2637 cejka 185
        phoneid = IPC_GET_ARG5(*olddata);
1027 palkovsky 186
        if (IPC_GET_RETVAL(answer->data)) {
187
            /* The connection was not accepted */
188
            phone_dealloc(phoneid);
1040 palkovsky 189
        } else {
1090 palkovsky 190
            /* The connection was accepted */
2359 jermar 191
            phone_connect(phoneid, &answer->sender->answerbox);
2638 jermar 192
            /* Set 'phone hash' as arg5 of response */
2637 cejka 193
            IPC_SET_ARG5(answer->data,
2359 jermar 194
                (unative_t) &TASK->phones[phoneid]);
1027 palkovsky 195
        }
1086 palkovsky 196
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
1060 palkovsky 197
        /* If the users accepted call, connect */
198
        if (!IPC_GET_RETVAL(answer->data)) {
2635 cejka 199
            ipc_phone_connect((phone_t *) IPC_GET_ARG5(*olddata),
2359 jermar 200
                &TASK->answerbox);
1060 palkovsky 201
        }
2677 jermar 202
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_OUT) {
2359 jermar 203
        if (!IPC_GET_RETVAL(answer->data)) {
204
            /* Accepted, handle as_area receipt */
1413 jermar 205
            ipl_t ipl;
1461 palkovsky 206
            int rc;
1413 jermar 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
 
2359 jermar 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));
1461 palkovsky 218
            IPC_SET_RETVAL(answer->data, rc);
219
            return rc;
1329 palkovsky 220
        }
2677 jermar 221
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_IN) {
1428 palkovsky 222
        if (!IPC_GET_RETVAL(answer->data)) {
223
            ipl_t ipl;
224
            as_t *as;
1434 palkovsky 225
            int rc;
1428 palkovsky 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
 
2359 jermar 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));
1434 palkovsky 236
            IPC_SET_RETVAL(answer->data, rc);
1428 palkovsky 237
        }
2662 jermar 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
        }
2660 jermar 265
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
2661 jermar 266
        ASSERT(answer->buffer);
2494 jermar 267
        if (!IPC_GET_RETVAL(answer->data)) {
2662 jermar 268
            /* The recipient agreed to receive data. */
2494 jermar 269
            int rc;
270
            uintptr_t dst;
271
            uintptr_t size;
2662 jermar 272
            uintptr_t max_size;
2494 jermar 273
 
274
            dst = IPC_GET_ARG1(answer->data);
2676 jermar 275
            size = IPC_GET_ARG2(answer->data);
276
            max_size = IPC_GET_ARG2(*olddata);
2494 jermar 277
 
2662 jermar 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
            }
2494 jermar 286
        }
2661 jermar 287
        free(answer->buffer);
288
        answer->buffer = NULL;
1027 palkovsky 289
    }
1329 palkovsky 290
    return 0;
1027 palkovsky 291
}
292
 
2471 jermar 293
/** Called before the request is sent.
1090 palkovsky 294
 *
2471 jermar 295
 * @param call      Call structure with the request.
296
 *
297
 * @return      Return 0 on success, ELIMIT or EPERM on error.
1090 palkovsky 298
 */
299
static int request_preprocess(call_t *call)
300
{
301
    int newphid;
1329 palkovsky 302
    size_t size;
2494 jermar 303
    uintptr_t src;
304
    int rc;
1090 palkovsky 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;
2638 jermar 311
        /* Set arg5 for server */
2635 cejka 312
        IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
1090 palkovsky 313
        call->flags |= IPC_CALL_CONN_ME_TO;
2098 decky 314
        call->priv = newphid;
1090 palkovsky 315
        break;
2677 jermar 316
    case IPC_M_SHARE_OUT:
2556 jermar 317
        size = as_area_get_size(IPC_GET_ARG1(call->data));
2471 jermar 318
        if (!size)
1329 palkovsky 319
            return EPERM;
1417 jermar 320
        IPC_SET_ARG2(call->data, size);
1329 palkovsky 321
        break;
2662 jermar 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;
2660 jermar 327
    case IPC_M_DATA_WRITE:
2676 jermar 328
        src = IPC_GET_ARG1(call->data);
329
        size = IPC_GET_ARG2(call->data);
2494 jermar 330
 
2660 jermar 331
        if ((size <= 0) || (size > DATA_XFER_LIMIT))
2494 jermar 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;
1090 palkovsky 341
    default:
342
        break;
343
    }
344
    return 0;
345
}
346
 
2471 jermar 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.
1027 palkovsky 354
 */
1090 palkovsky 355
static void process_answer(call_t *call)
1027 palkovsky 356
{
2745 decky 357
    if (((native_t) IPC_GET_RETVAL(call->data) == EHANGUP) &&
2359 jermar 358
        (call->flags & IPC_CALL_FORWARDED))
1088 palkovsky 359
        IPC_SET_RETVAL(call->data, EFORWARD);
1090 palkovsky 360
 
361
    if (call->flags & IPC_CALL_CONN_ME_TO) {
362
        if (IPC_GET_RETVAL(call->data))
2098 decky 363
            phone_dealloc(call->priv);
1090 palkovsky 364
        else
2635 cejka 365
            IPC_SET_ARG5(call->data, call->priv);
1090 palkovsky 366
    }
2662 jermar 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
    }
1027 palkovsky 378
}
379
 
2471 jermar 380
/** Do basic kernel processing of received call request.
1027 palkovsky 381
 *
2471 jermar 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.
1027 palkovsky 387
 */
2359 jermar 388
static int process_request(answerbox_t *box, call_t *call)
1027 palkovsky 389
{
390
    int phoneid;
391
 
1086 palkovsky 392
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
1040 palkovsky 393
        phoneid = phone_alloc();
1027 palkovsky 394
        if (phoneid < 0) { /* Failed to allocate phone */
395
            IPC_SET_RETVAL(call->data, ELIMIT);
2471 jermar 396
            ipc_answer(box, call);
1027 palkovsky 397
            return -1;
398
        }
2637 cejka 399
        IPC_SET_ARG5(call->data, phoneid);
1027 palkovsky 400
    }
401
    return 0;
402
}
403
 
2471 jermar 404
/** Make a fast call over IPC, wait for reply and return to user.
1027 palkovsky 405
 *
2615 jermar 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()).
2471 jermar 408
 *
409
 * @param phoneid   Phone handle for the call.
410
 * @param method    Method of the call.
411
 * @param arg1      Service-defined payload argument.
2615 jermar 412
 * @param arg2      Service-defined payload argument.
413
 * @param arg3      Service-defined payload argument.
2471 jermar 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.
1027 palkovsky 419
 */
2359 jermar 420
unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
2615 jermar 421
    unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
1027 palkovsky 422
{
423
    call_t call;
424
    phone_t *phone;
1090 palkovsky 425
    int res;
2617 jermar 426
    int rc;
1027 palkovsky 427
 
1084 palkovsky 428
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
1027 palkovsky 429
 
1084 palkovsky 430
    ipc_call_static_init(&call);
1027 palkovsky 431
    IPC_SET_METHOD(call.data, method);
432
    IPC_SET_ARG1(call.data, arg1);
2615 jermar 433
    IPC_SET_ARG2(call.data, arg2);
434
    IPC_SET_ARG3(call.data, arg3);
2620 jermar 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);
1027 palkovsky 441
 
2471 jermar 442
    if (!(res = request_preprocess(&call))) {
1090 palkovsky 443
        ipc_call_sync(phone, &call);
444
        process_answer(&call);
2471 jermar 445
    } else {
1090 palkovsky 446
        IPC_SET_RETVAL(call.data, res);
2471 jermar 447
    }
2617 jermar 448
    rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
449
    if (rc != 0)
450
        return rc;
1027 palkovsky 451
 
452
    return 0;
453
}
454
 
2471 jermar 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.
2494 jermar 459
 * @param reply     Userspace address of call data where to store the
460
 *          answer.
2471 jermar 461
 *
462
 * @return      Zero on success or an error code.
463
 */
2615 jermar 464
unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
2359 jermar 465
    ipc_data_t *reply)
1027 palkovsky 466
{
467
    call_t call;
468
    phone_t *phone;
1090 palkovsky 469
    int res;
1288 jermar 470
    int rc;
1027 palkovsky 471
 
1084 palkovsky 472
    ipc_call_static_init(&call);
2359 jermar 473
    rc = copy_from_uspace(&call.data.args, &question->args,
474
        sizeof(call.data.args));
1288 jermar 475
    if (rc != 0)
1780 jermar 476
        return (unative_t) rc;
1040 palkovsky 477
 
1084 palkovsky 478
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
1072 palkovsky 479
 
2471 jermar 480
    if (!(res = request_preprocess(&call))) {
1090 palkovsky 481
        ipc_call_sync(phone, &call);
482
        process_answer(&call);
483
    } else
484
        IPC_SET_RETVAL(call.data, res);
1027 palkovsky 485
 
1288 jermar 486
    rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
487
    if (rc != 0)
488
        return rc;
1027 palkovsky 489
 
490
    return 0;
491
}
492
 
2471 jermar 493
/** Check that the task did not exceed the allowed limit of asynchronous calls.
1027 palkovsky 494
 *
2471 jermar 495
 * @return      Return 0 if limit not reached or -1 if limit exceeded.
1027 palkovsky 496
 */
497
static 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
 
2471 jermar 506
/** Make a fast asynchronous call over IPC.
1027 palkovsky 507
 *
2618 jermar 508
 * This function can only handle four arguments of payload, but is faster than
509
 * the generic function sys_ipc_call_async_slow().
2471 jermar 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.
2618 jermar 515
 * @param arg3      Service-defined payload argument.
516
 * @param arg4      Service-defined payload argument.
2471 jermar 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.
1027 palkovsky 522
 */
2359 jermar 523
unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
2618 jermar 524
    unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
1027 palkovsky 525
{
526
    call_t *call;
527
    phone_t *phone;
1090 palkovsky 528
    int res;
1027 palkovsky 529
 
530
    if (check_call_limit())
531
        return IPC_CALLRET_TEMPORARY;
532
 
1090 palkovsky 533
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
1072 palkovsky 534
 
1258 palkovsky 535
    call = ipc_call_alloc(0);
1027 palkovsky 536
    IPC_SET_METHOD(call->data, method);
537
    IPC_SET_ARG1(call->data, arg1);
538
    IPC_SET_ARG2(call->data, arg2);
2618 jermar 539
    IPC_SET_ARG3(call->data, arg3);
540
    IPC_SET_ARG4(call->data, arg4);
2620 jermar 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);
1027 palkovsky 546
 
2359 jermar 547
    if (!(res = request_preprocess(call)))
1090 palkovsky 548
        ipc_call(phone, call);
549
    else
550
        ipc_backsend_err(phone, call, res);
1027 palkovsky 551
 
1780 jermar 552
    return (unative_t) call;
1027 palkovsky 553
}
554
 
2471 jermar 555
/** Make an asynchronous IPC call allowing to transmit the entire payload.
1027 palkovsky 556
 *
2471 jermar 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().
1027 palkovsky 561
 */
2618 jermar 562
unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data)
1027 palkovsky 563
{
564
    call_t *call;
565
    phone_t *phone;
1090 palkovsky 566
    int res;
1288 jermar 567
    int rc;
1027 palkovsky 568
 
1072 palkovsky 569
    if (check_call_limit())
570
        return IPC_CALLRET_TEMPORARY;
571
 
1090 palkovsky 572
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
1027 palkovsky 573
 
1258 palkovsky 574
    call = ipc_call_alloc(0);
2359 jermar 575
    rc = copy_from_uspace(&call->data.args, &data->args,
576
        sizeof(call->data.args));
1293 palkovsky 577
    if (rc != 0) {
578
        ipc_call_free(call);
1780 jermar 579
        return (unative_t) rc;
1293 palkovsky 580
    }
2359 jermar 581
    if (!(res = request_preprocess(call)))
1090 palkovsky 582
        ipc_call(phone, call);
583
    else
584
        ipc_backsend_err(phone, call, res);
1040 palkovsky 585
 
1780 jermar 586
    return (unative_t) call;
1027 palkovsky 587
}
588
 
2471 jermar 589
/** Forward a received call to another destination.
1040 palkovsky 590
 *
2471 jermar 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.
2636 jermar 595
 * @param arg2      New value of the second argument for the forwarded call.
2622 jermar 596
 * @param mode      Flags that specify mode of the forward operation.
1060 palkovsky 597
 *
2471 jermar 598
 * @return      Return 0 on succes, otherwise return an error code.
599
 *
2636 jermar 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.
2471 jermar 606
 *
2622 jermar 607
 * Warning: When implementing support for changing additional payload
2636 jermar 608
 *      arguments, make sure that ARG5 is not rewritten for certain
2622 jermar 609
 *      system IPC
1040 palkovsky 610
 */
1780 jermar 611
unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
2635 cejka 612
    unative_t method, unative_t arg1, unative_t arg2, int mode)
1040 palkovsky 613
{
614
    call_t *call;
615
    phone_t *phone;
616
 
617
    call = get_call(callid);
618
    if (!call)
619
        return ENOENT;
620
 
1088 palkovsky 621
    call->flags |= IPC_CALL_FORWARDED;
622
 
1084 palkovsky 623
    GET_CHECK_PHONE(phone, phoneid, {
1040 palkovsky 624
        IPC_SET_RETVAL(call->data, EFORWARD);
625
        ipc_answer(&TASK->answerbox, call);
626
        return ENOENT;
1084 palkovsky 627
    });    
1040 palkovsky 628
 
2557 jermar 629
    if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
1040 palkovsky 630
        IPC_SET_RETVAL(call->data, EFORWARD);
631
        ipc_answer(&TASK->answerbox, call);
632
        return EPERM;
633
    }
634
 
2557 jermar 635
    /*
636
     * Userspace is not allowed to change method of system methods on
2635 cejka 637
     * forward, allow changing ARG1, ARG2 and ARG3 by means of method,
638
     * arg1 and arg2.
2557 jermar 639
     * If the method is immutable, don't change anything.
1040 palkovsky 640
     */
2557 jermar 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)
2635 cejka 644
                phone_dealloc(IPC_GET_ARG5(call->data));
1090 palkovsky 645
 
2557 jermar 646
            IPC_SET_ARG1(call->data, method);
647
            IPC_SET_ARG2(call->data, arg1);
2635 cejka 648
            IPC_SET_ARG3(call->data, arg2);
2557 jermar 649
        } else {
650
            IPC_SET_METHOD(call->data, method);
651
            IPC_SET_ARG1(call->data, arg1);
2635 cejka 652
            IPC_SET_ARG2(call->data, arg2);
2557 jermar 653
        }
1040 palkovsky 654
    }
655
 
2622 jermar 656
    return ipc_forward(call, phone, &TASK->answerbox, mode);
1040 palkovsky 657
}
658
 
2471 jermar 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.
2619 jermar 668
 * @param arg3      Service-defined return value.
669
 * @param arg4      Service-defined return value.
2471 jermar 670
 *
671
 * @return      Return 0 on success, otherwise return an error code.   
672
 */
2359 jermar 673
unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
2619 jermar 674
    unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
1027 palkovsky 675
{
676
    call_t *call;
1040 palkovsky 677
    ipc_data_t saved_data;
1088 palkovsky 678
    int saveddata = 0;
1329 palkovsky 679
    int rc;
1027 palkovsky 680
 
1346 palkovsky 681
    /* Do not answer notification callids */
682
    if (callid & IPC_CALLID_NOTIFICATION)
683
        return 0;
684
 
1040 palkovsky 685
    call = get_call(callid);
686
    if (!call)
687
        return ENOENT;
1027 palkovsky 688
 
1088 palkovsky 689
    if (answer_need_old(call)) {
1040 palkovsky 690
        memcpy(&saved_data, &call->data, sizeof(call->data));
1088 palkovsky 691
        saveddata = 1;
1027 palkovsky 692
    }
693
 
694
    IPC_SET_RETVAL(call->data, retval);
695
    IPC_SET_ARG1(call->data, arg1);
696
    IPC_SET_ARG2(call->data, arg2);
2619 jermar 697
    IPC_SET_ARG3(call->data, arg3);
698
    IPC_SET_ARG4(call->data, arg4);
2620 jermar 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);
1329 palkovsky 704
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
1040 palkovsky 705
 
1027 palkovsky 706
    ipc_answer(&TASK->answerbox, call);
1329 palkovsky 707
    return rc;
1027 palkovsky 708
}
709
 
2471 jermar 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
 */
2619 jermar 717
unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data)
1027 palkovsky 718
{
719
    call_t *call;
1040 palkovsky 720
    ipc_data_t saved_data;
1088 palkovsky 721
    int saveddata = 0;
1288 jermar 722
    int rc;
1027 palkovsky 723
 
1346 palkovsky 724
    /* Do not answer notification callids */
725
    if (callid & IPC_CALLID_NOTIFICATION)
726
        return 0;
727
 
1040 palkovsky 728
    call = get_call(callid);
729
    if (!call)
730
        return ENOENT;
1027 palkovsky 731
 
1088 palkovsky 732
    if (answer_need_old(call)) {
1040 palkovsky 733
        memcpy(&saved_data, &call->data, sizeof(call->data));
1088 palkovsky 734
        saveddata = 1;
1027 palkovsky 735
    }
1288 jermar 736
    rc = copy_from_uspace(&call->data.args, &data->args,
2359 jermar 737
        sizeof(call->data.args));
1288 jermar 738
    if (rc != 0)
739
        return rc;
1027 palkovsky 740
 
1329 palkovsky 741
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
1027 palkovsky 742
 
743
    ipc_answer(&TASK->answerbox, call);
744
 
1329 palkovsky 745
    return rc;
1027 palkovsky 746
}
747
 
2471 jermar 748
/** Hang up a phone.
1086 palkovsky 749
 *
2471 jermar 750
 * @param       Phone handle of the phone to be hung up.
751
 *
752
 * @return      Return 0 on success or an error code.
1086 palkovsky 753
 */
1780 jermar 754
unative_t sys_ipc_hangup(int phoneid)
1086 palkovsky 755
{
756
    phone_t *phone;
757
 
758
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
759
 
1591 palkovsky 760
    if (ipc_phone_hangup(phone))
1086 palkovsky 761
        return -1;
762
 
763
    return 0;
764
}
765
 
2471 jermar 766
/** Wait for an incoming IPC call or an answer.
1027 palkovsky 767
 *
2359 jermar 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.
1364 jermar 772
 *
2471 jermar 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.
1027 palkovsky 777
 */
1780 jermar 778
unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
1027 palkovsky 779
{
780
    call_t *call;
781
 
782
restart:   
2359 jermar 783
    call = ipc_wait_for_call(&TASK->answerbox, usec,
784
        flags | SYNCH_FLAGS_INTERRUPTIBLE);
1088 palkovsky 785
    if (!call)
786
        return 0;
1027 palkovsky 787
 
1258 palkovsky 788
    if (call->flags & IPC_CALL_NOTIF) {
789
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
1693 palkovsky 790
 
791
        /* Set in_phone_hash to the interrupt counter */
2098 decky 792
        call->data.phone = (void *) call->priv;
1693 palkovsky 793
 
794
        STRUCT_TO_USPACE(calldata, &call->data);
795
 
1258 palkovsky 796
        ipc_call_free(call);
797
 
2471 jermar 798
        return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
1258 palkovsky 799
    }
800
 
1027 palkovsky 801
    if (call->flags & IPC_CALL_ANSWERED) {
1090 palkovsky 802
        process_answer(call);
1027 palkovsky 803
 
1086 palkovsky 804
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
805
 
1027 palkovsky 806
        atomic_dec(&TASK->active_calls);
1086 palkovsky 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);
1027 palkovsky 814
        ipc_call_free(call);
815
 
2471 jermar 816
        return ((unative_t) call) | IPC_CALLID_ANSWERED;
1027 palkovsky 817
    }
1086 palkovsky 818
 
1027 palkovsky 819
    if (process_request(&TASK->answerbox, call))
820
        goto restart;
1086 palkovsky 821
 
1090 palkovsky 822
    /* Include phone address('id') of the caller in the request,
823
     * copy whole call->data, not only call->data.args */
1396 palkovsky 824
    if (STRUCT_TO_USPACE(calldata, &call->data)) {
825
        return 0;
826
    }
1780 jermar 827
    return (unative_t)call;
1027 palkovsky 828
}
1258 palkovsky 829
 
2471 jermar 830
/** Connect an IRQ handler to a task.
1923 jermar 831
 *
2471 jermar 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.
1923 jermar 836
 *
2471 jermar 837
 * @return      EPERM or a return code returned by ipc_irq_register().
1923 jermar 838
 */
2359 jermar 839
unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
840
    irq_code_t *ucode)
1258 palkovsky 841
{
1297 jermar 842
    if (!(cap_get(TASK) & CAP_IRQ_REG))
843
        return EPERM;
844
 
1923 jermar 845
    return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
1258 palkovsky 846
}
847
 
2471 jermar 848
/** Disconnect an IRQ handler from a task.
1923 jermar 849
 *
2471 jermar 850
 * @param inr       IRQ number.
851
 * @param devno     Device number.
852
 *
853
 * @return      Zero on success or EPERM on error..
1923 jermar 854
 */
855
unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
1258 palkovsky 856
{
1297 jermar 857
    if (!(cap_get(TASK) & CAP_IRQ_REG))
858
        return EPERM;
859
 
1923 jermar 860
    ipc_irq_unregister(&TASK->answerbox, inr, devno);
1258 palkovsky 861
 
862
    return 0;
863
}
1702 cejka 864
 
1757 jermar 865
/** @}
1702 cejka 866
 */