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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
         */
3107 svoboda 171
        mutex_lock(&answer->data.phone->lock);
1141 palkovsky 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);
3107 svoboda 178
        mutex_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);
2948 svoboda 246
            if (size && size <= max_size) {
2662 jermar 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
                }
2948 svoboda 261
            } else if (!size) {
262
                IPC_SET_RETVAL(answer->data, EOK);
2662 jermar 263
            } else {
264
                IPC_SET_RETVAL(answer->data, ELIMIT);
265
            }
266
        }
2660 jermar 267
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
2661 jermar 268
        ASSERT(answer->buffer);
2494 jermar 269
        if (!IPC_GET_RETVAL(answer->data)) {
2662 jermar 270
            /* The recipient agreed to receive data. */
2494 jermar 271
            int rc;
272
            uintptr_t dst;
273
            uintptr_t size;
2662 jermar 274
            uintptr_t max_size;
2494 jermar 275
 
276
            dst = IPC_GET_ARG1(answer->data);
2676 jermar 277
            size = IPC_GET_ARG2(answer->data);
278
            max_size = IPC_GET_ARG2(*olddata);
2494 jermar 279
 
2662 jermar 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
            }
2494 jermar 288
        }
2661 jermar 289
        free(answer->buffer);
290
        answer->buffer = NULL;
1027 palkovsky 291
    }
1329 palkovsky 292
    return 0;
1027 palkovsky 293
}
294
 
2471 jermar 295
/** Called before the request is sent.
1090 palkovsky 296
 *
2471 jermar 297
 * @param call      Call structure with the request.
298
 *
299
 * @return      Return 0 on success, ELIMIT or EPERM on error.
1090 palkovsky 300
 */
301
static int request_preprocess(call_t *call)
302
{
303
    int newphid;
1329 palkovsky 304
    size_t size;
2494 jermar 305
    uintptr_t src;
306
    int rc;
1090 palkovsky 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;
2638 jermar 313
        /* Set arg5 for server */
2635 cejka 314
        IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
1090 palkovsky 315
        call->flags |= IPC_CALL_CONN_ME_TO;
2098 decky 316
        call->priv = newphid;
1090 palkovsky 317
        break;
2677 jermar 318
    case IPC_M_SHARE_OUT:
2556 jermar 319
        size = as_area_get_size(IPC_GET_ARG1(call->data));
2471 jermar 320
        if (!size)
1329 palkovsky 321
            return EPERM;
1417 jermar 322
        IPC_SET_ARG2(call->data, size);
1329 palkovsky 323
        break;
2662 jermar 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;
2660 jermar 329
    case IPC_M_DATA_WRITE:
2676 jermar 330
        src = IPC_GET_ARG1(call->data);
331
        size = IPC_GET_ARG2(call->data);
2494 jermar 332
 
2660 jermar 333
        if ((size <= 0) || (size > DATA_XFER_LIMIT))
2494 jermar 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;
1090 palkovsky 343
    default:
344
        break;
345
    }
346
    return 0;
347
}
348
 
2471 jermar 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.
1027 palkovsky 356
 */
1090 palkovsky 357
static void process_answer(call_t *call)
1027 palkovsky 358
{
2745 decky 359
    if (((native_t) IPC_GET_RETVAL(call->data) == EHANGUP) &&
2359 jermar 360
        (call->flags & IPC_CALL_FORWARDED))
1088 palkovsky 361
        IPC_SET_RETVAL(call->data, EFORWARD);
1090 palkovsky 362
 
363
    if (call->flags & IPC_CALL_CONN_ME_TO) {
364
        if (IPC_GET_RETVAL(call->data))
2098 decky 365
            phone_dealloc(call->priv);
1090 palkovsky 366
        else
2635 cejka 367
            IPC_SET_ARG5(call->data, call->priv);
1090 palkovsky 368
    }
2662 jermar 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
    }
1027 palkovsky 380
}
381
 
2471 jermar 382
/** Do basic kernel processing of received call request.
1027 palkovsky 383
 *
2471 jermar 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.
1027 palkovsky 389
 */
2359 jermar 390
static int process_request(answerbox_t *box, call_t *call)
1027 palkovsky 391
{
392
    int phoneid;
393
 
1086 palkovsky 394
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
1040 palkovsky 395
        phoneid = phone_alloc();
1027 palkovsky 396
        if (phoneid < 0) { /* Failed to allocate phone */
397
            IPC_SET_RETVAL(call->data, ELIMIT);
2471 jermar 398
            ipc_answer(box, call);
1027 palkovsky 399
            return -1;
400
        }
2637 cejka 401
        IPC_SET_ARG5(call->data, phoneid);
1027 palkovsky 402
    }
403
    return 0;
404
}
405
 
2471 jermar 406
/** Make a fast call over IPC, wait for reply and return to user.
1027 palkovsky 407
 *
2615 jermar 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()).
2471 jermar 410
 *
411
 * @param phoneid   Phone handle for the call.
412
 * @param method    Method of the call.
413
 * @param arg1      Service-defined payload argument.
2615 jermar 414
 * @param arg2      Service-defined payload argument.
415
 * @param arg3      Service-defined payload argument.
2471 jermar 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.
1027 palkovsky 421
 */
2359 jermar 422
unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
2615 jermar 423
    unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
1027 palkovsky 424
{
425
    call_t call;
426
    phone_t *phone;
1090 palkovsky 427
    int res;
2617 jermar 428
    int rc;
3149 svoboda 429
 
1084 palkovsky 430
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
1027 palkovsky 431
 
1084 palkovsky 432
    ipc_call_static_init(&call);
1027 palkovsky 433
    IPC_SET_METHOD(call.data, method);
434
    IPC_SET_ARG1(call.data, arg1);
2615 jermar 435
    IPC_SET_ARG2(call.data, arg2);
436
    IPC_SET_ARG3(call.data, arg3);
2620 jermar 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);
1027 palkovsky 443
 
2471 jermar 444
    if (!(res = request_preprocess(&call))) {
1090 palkovsky 445
        ipc_call_sync(phone, &call);
446
        process_answer(&call);
2471 jermar 447
    } else {
1090 palkovsky 448
        IPC_SET_RETVAL(call.data, res);
2471 jermar 449
    }
2617 jermar 450
    rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
451
    if (rc != 0)
452
        return rc;
1027 palkovsky 453
 
454
    return 0;
455
}
456
 
2471 jermar 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.
2494 jermar 461
 * @param reply     Userspace address of call data where to store the
462
 *          answer.
2471 jermar 463
 *
464
 * @return      Zero on success or an error code.
465
 */
2615 jermar 466
unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
2359 jermar 467
    ipc_data_t *reply)
1027 palkovsky 468
{
469
    call_t call;
470
    phone_t *phone;
1090 palkovsky 471
    int res;
1288 jermar 472
    int rc;
1027 palkovsky 473
 
1084 palkovsky 474
    ipc_call_static_init(&call);
2359 jermar 475
    rc = copy_from_uspace(&call.data.args, &question->args,
476
        sizeof(call.data.args));
1288 jermar 477
    if (rc != 0)
1780 jermar 478
        return (unative_t) rc;
1040 palkovsky 479
 
1084 palkovsky 480
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
1072 palkovsky 481
 
2471 jermar 482
    if (!(res = request_preprocess(&call))) {
1090 palkovsky 483
        ipc_call_sync(phone, &call);
484
        process_answer(&call);
485
    } else
486
        IPC_SET_RETVAL(call.data, res);
1027 palkovsky 487
 
1288 jermar 488
    rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
489
    if (rc != 0)
490
        return rc;
1027 palkovsky 491
 
492
    return 0;
493
}
494
 
2471 jermar 495
/** Check that the task did not exceed the allowed limit of asynchronous calls.
1027 palkovsky 496
 *
2471 jermar 497
 * @return      Return 0 if limit not reached or -1 if limit exceeded.
1027 palkovsky 498
 */
499
static 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
 
2471 jermar 508
/** Make a fast asynchronous call over IPC.
1027 palkovsky 509
 *
2618 jermar 510
 * This function can only handle four arguments of payload, but is faster than
511
 * the generic function sys_ipc_call_async_slow().
2471 jermar 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.
2618 jermar 517
 * @param arg3      Service-defined payload argument.
518
 * @param arg4      Service-defined payload argument.
2471 jermar 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.
1027 palkovsky 524
 */
2359 jermar 525
unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
2618 jermar 526
    unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
1027 palkovsky 527
{
528
    call_t *call;
529
    phone_t *phone;
1090 palkovsky 530
    int res;
1027 palkovsky 531
 
532
    if (check_call_limit())
533
        return IPC_CALLRET_TEMPORARY;
534
 
1090 palkovsky 535
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
1072 palkovsky 536
 
1258 palkovsky 537
    call = ipc_call_alloc(0);
1027 palkovsky 538
    IPC_SET_METHOD(call->data, method);
539
    IPC_SET_ARG1(call->data, arg1);
540
    IPC_SET_ARG2(call->data, arg2);
2618 jermar 541
    IPC_SET_ARG3(call->data, arg3);
542
    IPC_SET_ARG4(call->data, arg4);
2620 jermar 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);
1027 palkovsky 548
 
2359 jermar 549
    if (!(res = request_preprocess(call)))
1090 palkovsky 550
        ipc_call(phone, call);
551
    else
552
        ipc_backsend_err(phone, call, res);
1027 palkovsky 553
 
1780 jermar 554
    return (unative_t) call;
1027 palkovsky 555
}
556
 
2471 jermar 557
/** Make an asynchronous IPC call allowing to transmit the entire payload.
1027 palkovsky 558
 *
2471 jermar 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().
1027 palkovsky 563
 */
2618 jermar 564
unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data)
1027 palkovsky 565
{
566
    call_t *call;
567
    phone_t *phone;
1090 palkovsky 568
    int res;
1288 jermar 569
    int rc;
1027 palkovsky 570
 
1072 palkovsky 571
    if (check_call_limit())
572
        return IPC_CALLRET_TEMPORARY;
573
 
1090 palkovsky 574
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
1027 palkovsky 575
 
1258 palkovsky 576
    call = ipc_call_alloc(0);
2359 jermar 577
    rc = copy_from_uspace(&call->data.args, &data->args,
578
        sizeof(call->data.args));
1293 palkovsky 579
    if (rc != 0) {
580
        ipc_call_free(call);
1780 jermar 581
        return (unative_t) rc;
1293 palkovsky 582
    }
2359 jermar 583
    if (!(res = request_preprocess(call)))
1090 palkovsky 584
        ipc_call(phone, call);
585
    else
586
        ipc_backsend_err(phone, call, res);
1040 palkovsky 587
 
1780 jermar 588
    return (unative_t) call;
1027 palkovsky 589
}
590
 
2471 jermar 591
/** Forward a received call to another destination.
1040 palkovsky 592
 *
2471 jermar 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.
2636 jermar 597
 * @param arg2      New value of the second argument for the forwarded call.
2622 jermar 598
 * @param mode      Flags that specify mode of the forward operation.
1060 palkovsky 599
 *
2471 jermar 600
 * @return      Return 0 on succes, otherwise return an error code.
601
 *
2636 jermar 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.
2471 jermar 608
 *
2622 jermar 609
 * Warning: When implementing support for changing additional payload
2636 jermar 610
 *      arguments, make sure that ARG5 is not rewritten for certain
2622 jermar 611
 *      system IPC
1040 palkovsky 612
 */
1780 jermar 613
unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
2635 cejka 614
    unative_t method, unative_t arg1, unative_t arg2, int mode)
1040 palkovsky 615
{
616
    call_t *call;
617
    phone_t *phone;
618
 
619
    call = get_call(callid);
620
    if (!call)
621
        return ENOENT;
622
 
1088 palkovsky 623
    call->flags |= IPC_CALL_FORWARDED;
624
 
1084 palkovsky 625
    GET_CHECK_PHONE(phone, phoneid, {
1040 palkovsky 626
        IPC_SET_RETVAL(call->data, EFORWARD);
627
        ipc_answer(&TASK->answerbox, call);
628
        return ENOENT;
3149 svoboda 629
    });
1040 palkovsky 630
 
2557 jermar 631
    if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
1040 palkovsky 632
        IPC_SET_RETVAL(call->data, EFORWARD);
633
        ipc_answer(&TASK->answerbox, call);
634
        return EPERM;
635
    }
636
 
2557 jermar 637
    /*
638
     * Userspace is not allowed to change method of system methods on
2635 cejka 639
     * forward, allow changing ARG1, ARG2 and ARG3 by means of method,
640
     * arg1 and arg2.
2557 jermar 641
     * If the method is immutable, don't change anything.
1040 palkovsky 642
     */
2557 jermar 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)
2635 cejka 646
                phone_dealloc(IPC_GET_ARG5(call->data));
1090 palkovsky 647
 
2557 jermar 648
            IPC_SET_ARG1(call->data, method);
649
            IPC_SET_ARG2(call->data, arg1);
2635 cejka 650
            IPC_SET_ARG3(call->data, arg2);
2557 jermar 651
        } else {
652
            IPC_SET_METHOD(call->data, method);
653
            IPC_SET_ARG1(call->data, arg1);
2635 cejka 654
            IPC_SET_ARG2(call->data, arg2);
2557 jermar 655
        }
1040 palkovsky 656
    }
657
 
2622 jermar 658
    return ipc_forward(call, phone, &TASK->answerbox, mode);
1040 palkovsky 659
}
660
 
2471 jermar 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.
2619 jermar 670
 * @param arg3      Service-defined return value.
671
 * @param arg4      Service-defined return value.
2471 jermar 672
 *
673
 * @return      Return 0 on success, otherwise return an error code.   
674
 */
2359 jermar 675
unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
2619 jermar 676
    unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
1027 palkovsky 677
{
678
    call_t *call;
1040 palkovsky 679
    ipc_data_t saved_data;
1088 palkovsky 680
    int saveddata = 0;
1329 palkovsky 681
    int rc;
1027 palkovsky 682
 
1346 palkovsky 683
    /* Do not answer notification callids */
684
    if (callid & IPC_CALLID_NOTIFICATION)
685
        return 0;
686
 
1040 palkovsky 687
    call = get_call(callid);
688
    if (!call)
689
        return ENOENT;
1027 palkovsky 690
 
1088 palkovsky 691
    if (answer_need_old(call)) {
1040 palkovsky 692
        memcpy(&saved_data, &call->data, sizeof(call->data));
1088 palkovsky 693
        saveddata = 1;
1027 palkovsky 694
    }
695
 
696
    IPC_SET_RETVAL(call->data, retval);
697
    IPC_SET_ARG1(call->data, arg1);
698
    IPC_SET_ARG2(call->data, arg2);
2619 jermar 699
    IPC_SET_ARG3(call->data, arg3);
700
    IPC_SET_ARG4(call->data, arg4);
2620 jermar 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);
1329 palkovsky 706
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
1040 palkovsky 707
 
1027 palkovsky 708
    ipc_answer(&TASK->answerbox, call);
1329 palkovsky 709
    return rc;
1027 palkovsky 710
}
711
 
2471 jermar 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
 */
2619 jermar 719
unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data)
1027 palkovsky 720
{
721
    call_t *call;
1040 palkovsky 722
    ipc_data_t saved_data;
1088 palkovsky 723
    int saveddata = 0;
1288 jermar 724
    int rc;
1027 palkovsky 725
 
1346 palkovsky 726
    /* Do not answer notification callids */
727
    if (callid & IPC_CALLID_NOTIFICATION)
728
        return 0;
729
 
1040 palkovsky 730
    call = get_call(callid);
731
    if (!call)
732
        return ENOENT;
1027 palkovsky 733
 
1088 palkovsky 734
    if (answer_need_old(call)) {
1040 palkovsky 735
        memcpy(&saved_data, &call->data, sizeof(call->data));
1088 palkovsky 736
        saveddata = 1;
1027 palkovsky 737
    }
1288 jermar 738
    rc = copy_from_uspace(&call->data.args, &data->args,
2359 jermar 739
        sizeof(call->data.args));
1288 jermar 740
    if (rc != 0)
741
        return rc;
1027 palkovsky 742
 
1329 palkovsky 743
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
1027 palkovsky 744
 
745
    ipc_answer(&TASK->answerbox, call);
746
 
1329 palkovsky 747
    return rc;
1027 palkovsky 748
}
749
 
2471 jermar 750
/** Hang up a phone.
1086 palkovsky 751
 *
2471 jermar 752
 * @param       Phone handle of the phone to be hung up.
753
 *
754
 * @return      Return 0 on success or an error code.
1086 palkovsky 755
 */
1780 jermar 756
unative_t sys_ipc_hangup(int phoneid)
1086 palkovsky 757
{
758
    phone_t *phone;
759
 
760
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
761
 
1591 palkovsky 762
    if (ipc_phone_hangup(phone))
1086 palkovsky 763
        return -1;
764
 
765
    return 0;
766
}
767
 
2471 jermar 768
/** Wait for an incoming IPC call or an answer.
1027 palkovsky 769
 *
2359 jermar 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.
1364 jermar 774
 *
2471 jermar 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.
1027 palkovsky 779
 */
1780 jermar 780
unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
1027 palkovsky 781
{
782
    call_t *call;
783
 
784
restart:   
2359 jermar 785
    call = ipc_wait_for_call(&TASK->answerbox, usec,
786
        flags | SYNCH_FLAGS_INTERRUPTIBLE);
1088 palkovsky 787
    if (!call)
788
        return 0;
1027 palkovsky 789
 
1258 palkovsky 790
    if (call->flags & IPC_CALL_NOTIF) {
791
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
1693 palkovsky 792
 
793
        /* Set in_phone_hash to the interrupt counter */
2098 decky 794
        call->data.phone = (void *) call->priv;
1693 palkovsky 795
 
796
        STRUCT_TO_USPACE(calldata, &call->data);
797
 
1258 palkovsky 798
        ipc_call_free(call);
799
 
2471 jermar 800
        return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
1258 palkovsky 801
    }
802
 
1027 palkovsky 803
    if (call->flags & IPC_CALL_ANSWERED) {
1090 palkovsky 804
        process_answer(call);
1027 palkovsky 805
 
1086 palkovsky 806
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
807
 
1027 palkovsky 808
        atomic_dec(&TASK->active_calls);
1086 palkovsky 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);
1027 palkovsky 816
        ipc_call_free(call);
817
 
2471 jermar 818
        return ((unative_t) call) | IPC_CALLID_ANSWERED;
1027 palkovsky 819
    }
1086 palkovsky 820
 
1027 palkovsky 821
    if (process_request(&TASK->answerbox, call))
822
        goto restart;
1086 palkovsky 823
 
1090 palkovsky 824
    /* Include phone address('id') of the caller in the request,
825
     * copy whole call->data, not only call->data.args */
1396 palkovsky 826
    if (STRUCT_TO_USPACE(calldata, &call->data)) {
827
        return 0;
828
    }
1780 jermar 829
    return (unative_t)call;
1027 palkovsky 830
}
1258 palkovsky 831
 
2471 jermar 832
/** Connect an IRQ handler to a task.
1923 jermar 833
 *
2471 jermar 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.
1923 jermar 838
 *
2471 jermar 839
 * @return      EPERM or a return code returned by ipc_irq_register().
1923 jermar 840
 */
2359 jermar 841
unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
842
    irq_code_t *ucode)
1258 palkovsky 843
{
1297 jermar 844
    if (!(cap_get(TASK) & CAP_IRQ_REG))
845
        return EPERM;
846
 
1923 jermar 847
    return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
1258 palkovsky 848
}
849
 
2471 jermar 850
/** Disconnect an IRQ handler from a task.
1923 jermar 851
 *
2471 jermar 852
 * @param inr       IRQ number.
853
 * @param devno     Device number.
854
 *
855
 * @return      Zero on success or EPERM on error..
1923 jermar 856
 */
857
unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
1258 palkovsky 858
{
1297 jermar 859
    if (!(cap_get(TASK) & CAP_IRQ_REG))
860
        return EPERM;
861
 
1923 jermar 862
    ipc_irq_unregister(&TASK->answerbox, inr, devno);
1258 palkovsky 863
 
864
    return 0;
865
}
1702 cejka 866
 
1757 jermar 867
/** @}
1702 cejka 868
 */