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1027 palkovsky 1
/*
2
 * Copyright (C) 2006 Ondrej Palkovsky
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
#include <arch.h>
30
#include <proc/task.h>
1288 jermar 31
#include <proc/thread.h>
1027 palkovsky 32
#include <errno.h>
33
#include <memstr.h>
34
#include <debug.h>
35
#include <ipc/ipc.h>
36
#include <ipc/sysipc.h>
1281 palkovsky 37
#include <ipc/irq.h>
1072 palkovsky 38
#include <ipc/ipcrsc.h>
1258 palkovsky 39
#include <arch/interrupt.h>
1027 palkovsky 40
#include <print.h>
1288 jermar 41
#include <syscall/copy.h>
1297 jermar 42
#include <security/cap.h>
1329 palkovsky 43
#include <mm/as.h>
1027 palkovsky 44
 
1084 palkovsky 45
#define GET_CHECK_PHONE(phone,phoneid,err) { \
46
      if (phoneid > IPC_MAX_PHONES) { err; } \
47
      phone = &TASK->phones[phoneid]; \
48
}
49
 
1090 palkovsky 50
#define STRUCT_TO_USPACE(dst,src) copy_to_uspace(dst,src,sizeof(*(src)))
1084 palkovsky 51
 
1040 palkovsky 52
/** Return true if the method is a system method */
53
static inline int is_system_method(__native method)
54
{
55
    if (method <= IPC_M_LAST_SYSTEM)
56
        return 1;
57
    return 0;
58
}
59
 
60
/** Return true if the message with this method is forwardable
61
 *
62
 * - some system messages may be forwarded, for some of them
63
 *   it is useless
64
 */
65
static inline int is_forwardable(__native method)
66
{
1346 palkovsky 67
    if (method == IPC_M_PHONE_HUNGUP || method == IPC_M_AS_SEND)
1086 palkovsky 68
        return 0; /* This message is meant only for the receiver */
1040 palkovsky 69
    return 1;
70
}
71
 
1027 palkovsky 72
/****************************************************/
73
/* Functions that preprocess answer before sending
74
 * it to the recepient
75
 */
76
 
77
/** Return true if the caller (ipc_answer) should save
1088 palkovsky 78
 * the old call contents for answer_preprocess
1027 palkovsky 79
 */
1088 palkovsky 80
static inline int answer_need_old(call_t *call)
1027 palkovsky 81
{
1086 palkovsky 82
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
1027 palkovsky 83
        return 1;
1086 palkovsky 84
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)
1060 palkovsky 85
        return 1;
1329 palkovsky 86
    if (IPC_GET_METHOD(call->data) == IPC_M_AS_SEND)
87
        return 1;
1027 palkovsky 88
    return 0;
89
}
90
 
91
/** Interpret process answer as control information */
1329 palkovsky 92
static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
1027 palkovsky 93
{
94
    int phoneid;
95
 
1088 palkovsky 96
    if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
1141 palkovsky 97
        /* In case of forward, hangup the forwared phone,
98
         * not the originator
99
         */
100
        spinlock_lock(&answer->data.phone->lock);
101
        spinlock_lock(&TASK->answerbox.lock);
102
        if (answer->data.phone->callee) {
103
            list_remove(&answer->data.phone->list);
104
            answer->data.phone->callee = 0;
105
        }
106
        spinlock_unlock(&TASK->answerbox.lock);
107
        spinlock_unlock(&answer->data.phone->lock);
1088 palkovsky 108
    }
109
 
110
    if (!olddata)
1329 palkovsky 111
        return 0;
1088 palkovsky 112
 
1086 palkovsky 113
    if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
1040 palkovsky 114
        phoneid = IPC_GET_ARG3(*olddata);
1027 palkovsky 115
        if (IPC_GET_RETVAL(answer->data)) {
116
            /* The connection was not accepted */
117
            phone_dealloc(phoneid);
1040 palkovsky 118
        } else {
1090 palkovsky 119
            /* The connection was accepted */
1040 palkovsky 120
            phone_connect(phoneid,&answer->sender->answerbox);
1090 palkovsky 121
            /* Set 'phone identification' as arg3 of response */
122
            IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);
1027 palkovsky 123
        }
1086 palkovsky 124
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
1060 palkovsky 125
        /* If the users accepted call, connect */
126
        if (!IPC_GET_RETVAL(answer->data)) {
127
            ipc_phone_connect((phone_t *)IPC_GET_ARG3(*olddata),
128
                      &TASK->answerbox);
129
        }
1329 palkovsky 130
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_SEND) {
131
        if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle As_area receival */
132
            return as_area_steal(answer->sender,
133
                         IPC_GET_ARG2(*olddata),IPC_GET_ARG3(*olddata),
134
                         IPC_GET_ARG1(answer->data));
135
        }
1027 palkovsky 136
    }
1329 palkovsky 137
    return 0;
1027 palkovsky 138
}
139
 
1090 palkovsky 140
/** Called before the request is sent
141
 *
142
 * @return 0 - no error, -1 - report error to user
143
 */
144
static int request_preprocess(call_t *call)
145
{
146
    int newphid;
1329 palkovsky 147
    size_t size;
1090 palkovsky 148
 
149
    switch (IPC_GET_METHOD(call->data)) {
150
    case IPC_M_CONNECT_ME_TO:
151
        newphid = phone_alloc();
152
        if (newphid < 0)
153
            return ELIMIT;
154
        /* Set arg3 for server */
155
        IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);
156
        call->flags |= IPC_CALL_CONN_ME_TO;
157
        call->private = newphid;
158
        break;
1329 palkovsky 159
    case IPC_M_AS_SEND:
160
        size = as_get_size(IPC_GET_ARG2(call->data));
161
        if (!size) {
162
            return EPERM;
163
        }
164
        IPC_SET_ARG3(call->data, size);
165
        break;
1090 palkovsky 166
    default:
167
        break;
168
    }
169
    return 0;
170
}
171
 
1027 palkovsky 172
/****************************************************/
173
/* Functions called to process received call/answer
174
 * before passing to uspace
175
 */
176
 
177
/** Do basic kernel processing of received call answer */
1090 palkovsky 178
static void process_answer(call_t *call)
1027 palkovsky 179
{
1088 palkovsky 180
    if (IPC_GET_RETVAL(call->data) == EHANGUP && \
181
        call->flags & IPC_CALL_FORWARDED)
182
        IPC_SET_RETVAL(call->data, EFORWARD);
1090 palkovsky 183
 
184
    if (call->flags & IPC_CALL_CONN_ME_TO) {
185
        if (IPC_GET_RETVAL(call->data))
186
            phone_dealloc(call->private);
187
        else
188
            IPC_SET_ARG3(call->data, call->private);
189
    }
1027 palkovsky 190
}
191
 
192
/** Do basic kernel processing of received call request
193
 *
194
 * @return 0 - the call should be passed to userspace, 1 - ignore call
195
 */
196
static int process_request(answerbox_t *box,call_t *call)
197
{
198
    int phoneid;
199
 
1086 palkovsky 200
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
1040 palkovsky 201
        phoneid = phone_alloc();
1027 palkovsky 202
        if (phoneid < 0) { /* Failed to allocate phone */
203
            IPC_SET_RETVAL(call->data, ELIMIT);
204
            ipc_answer(box,call);
205
            return -1;
206
        }
207
        IPC_SET_ARG3(call->data, phoneid);
208
    }
209
    return 0;
210
}
211
 
212
/** Send a call over IPC, wait for reply, return to user
213
 *
214
 * @return Call identification, returns -1 on fatal error,
215
           -2 on 'Too many async request, handle answers first
216
 */
217
__native sys_ipc_call_sync_fast(__native phoneid, __native method,
1086 palkovsky 218
                __native arg1, ipc_data_t *data)
1027 palkovsky 219
{
220
    call_t call;
221
    phone_t *phone;
1090 palkovsky 222
    int res;
1027 palkovsky 223
 
1084 palkovsky 224
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
1027 palkovsky 225
 
1084 palkovsky 226
    ipc_call_static_init(&call);
1027 palkovsky 227
    IPC_SET_METHOD(call.data, method);
228
    IPC_SET_ARG1(call.data, arg1);
229
 
1090 palkovsky 230
    if (!(res=request_preprocess(&call))) {
231
        ipc_call_sync(phone, &call);
232
        process_answer(&call);
233
    } else
234
        IPC_SET_RETVAL(call.data, res);
1086 palkovsky 235
    STRUCT_TO_USPACE(&data->args, &call.data.args);
1027 palkovsky 236
 
237
    return 0;
238
}
239
 
240
/** Synchronous IPC call allowing to send whole message */
1086 palkovsky 241
__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,
242
               ipc_data_t *reply)
1027 palkovsky 243
{
244
    call_t call;
245
    phone_t *phone;
1090 palkovsky 246
    int res;
1288 jermar 247
    int rc;
1027 palkovsky 248
 
1084 palkovsky 249
    ipc_call_static_init(&call);
1288 jermar 250
    rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));
251
    if (rc != 0)
252
        return (__native) rc;
1040 palkovsky 253
 
1084 palkovsky 254
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
1072 palkovsky 255
 
1090 palkovsky 256
    if (!(res=request_preprocess(&call))) {
257
        ipc_call_sync(phone, &call);
258
        process_answer(&call);
259
    } else
260
        IPC_SET_RETVAL(call.data, res);
1027 palkovsky 261
 
1288 jermar 262
    rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
263
    if (rc != 0)
264
        return rc;
1027 palkovsky 265
 
266
    return 0;
267
}
268
 
269
/** Check that the task did not exceed allowed limit
270
 *
271
 * @return 0 - Limit OK,   -1 - limit exceeded
272
 */
273
static int check_call_limit(void)
274
{
275
    if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
276
        atomic_dec(&TASK->active_calls);
277
        return -1;
278
    }
279
    return 0;
280
}
281
 
282
/** Send an asynchronous call over ipc
283
 *
284
 * @return Call identification, returns -1 on fatal error,
285
           -2 on 'Too many async request, handle answers first
286
 */
287
__native sys_ipc_call_async_fast(__native phoneid, __native method,
288
                 __native arg1, __native arg2)
289
{
290
    call_t *call;
291
    phone_t *phone;
1090 palkovsky 292
    int res;
1027 palkovsky 293
 
294
    if (check_call_limit())
295
        return IPC_CALLRET_TEMPORARY;
296
 
1090 palkovsky 297
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
1072 palkovsky 298
 
1258 palkovsky 299
    call = ipc_call_alloc(0);
1027 palkovsky 300
    IPC_SET_METHOD(call->data, method);
301
    IPC_SET_ARG1(call->data, arg1);
302
    IPC_SET_ARG2(call->data, arg2);
303
 
1090 palkovsky 304
    if (!(res=request_preprocess(call)))
305
        ipc_call(phone, call);
306
    else
307
        ipc_backsend_err(phone, call, res);
1027 palkovsky 308
 
309
    return (__native) call;
310
}
311
 
312
/** Synchronous IPC call allowing to send whole message
313
 *
314
 * @return The same as sys_ipc_call_async
315
 */
1086 palkovsky 316
__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)
1027 palkovsky 317
{
318
    call_t *call;
319
    phone_t *phone;
1090 palkovsky 320
    int res;
1288 jermar 321
    int rc;
1027 palkovsky 322
 
1072 palkovsky 323
    if (check_call_limit())
324
        return IPC_CALLRET_TEMPORARY;
325
 
1090 palkovsky 326
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
1027 palkovsky 327
 
1258 palkovsky 328
    call = ipc_call_alloc(0);
1288 jermar 329
    rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));
1293 palkovsky 330
    if (rc != 0) {
331
        ipc_call_free(call);
1288 jermar 332
        return (__native) rc;
1293 palkovsky 333
    }
1090 palkovsky 334
    if (!(res=request_preprocess(call)))
335
        ipc_call(phone, call);
336
    else
337
        ipc_backsend_err(phone, call, res);
1040 palkovsky 338
 
1027 palkovsky 339
    return (__native) call;
340
}
341
 
1040 palkovsky 342
/** Forward received call to another destination
343
 *
344
 * The arg1 and arg2 are changed in the forwarded message
1060 palkovsky 345
 *
346
 * Warning: If implementing non-fast version, make sure that
347
 *          arg3 is not rewritten for certain system IPC
1040 palkovsky 348
 */
349
__native sys_ipc_forward_fast(__native callid, __native phoneid,
350
                  __native method, __native arg1)
351
{
352
    call_t *call;
353
    phone_t *phone;
354
 
355
    call = get_call(callid);
356
    if (!call)
357
        return ENOENT;
358
 
1088 palkovsky 359
    call->flags |= IPC_CALL_FORWARDED;
360
 
1084 palkovsky 361
    GET_CHECK_PHONE(phone, phoneid, {
1040 palkovsky 362
        IPC_SET_RETVAL(call->data, EFORWARD);
363
        ipc_answer(&TASK->answerbox, call);
364
        return ENOENT;
1084 palkovsky 365
    });    
1040 palkovsky 366
 
367
    if (!is_forwardable(IPC_GET_METHOD(call->data))) {
368
        IPC_SET_RETVAL(call->data, EFORWARD);
369
        ipc_answer(&TASK->answerbox, call);
370
        return EPERM;
371
    }
372
 
373
    /* Userspace is not allowed to change method of system methods
374
     * on forward, allow changing ARG1 and ARG2 by means of method and arg1
375
     */
376
    if (is_system_method(IPC_GET_METHOD(call->data))) {
1090 palkovsky 377
        if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
378
            phone_dealloc(IPC_GET_ARG3(call->data));
379
 
1040 palkovsky 380
        IPC_SET_ARG1(call->data, method);
381
        IPC_SET_ARG2(call->data, arg1);
382
    } else {
383
        IPC_SET_METHOD(call->data, method);
384
        IPC_SET_ARG1(call->data, arg1);
385
    }
386
 
1088 palkovsky 387
    return ipc_forward(call, phone, &TASK->answerbox);
1040 palkovsky 388
}
389
 
1027 palkovsky 390
/** Send IPC answer */
391
__native sys_ipc_answer_fast(__native callid, __native retval,
392
                 __native arg1, __native arg2)
393
{
394
    call_t *call;
1040 palkovsky 395
    ipc_data_t saved_data;
1088 palkovsky 396
    int saveddata = 0;
1329 palkovsky 397
    int rc;
1027 palkovsky 398
 
1346 palkovsky 399
    /* Do not answer notification callids */
400
    if (callid & IPC_CALLID_NOTIFICATION)
401
        return 0;
402
 
1040 palkovsky 403
    call = get_call(callid);
404
    if (!call)
405
        return ENOENT;
1027 palkovsky 406
 
1088 palkovsky 407
    if (answer_need_old(call)) {
1040 palkovsky 408
        memcpy(&saved_data, &call->data, sizeof(call->data));
1088 palkovsky 409
        saveddata = 1;
1027 palkovsky 410
    }
411
 
412
    IPC_SET_RETVAL(call->data, retval);
413
    IPC_SET_ARG1(call->data, arg1);
414
    IPC_SET_ARG2(call->data, arg2);
1329 palkovsky 415
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
1040 palkovsky 416
 
1027 palkovsky 417
    ipc_answer(&TASK->answerbox, call);
1329 palkovsky 418
    return rc;
1027 palkovsky 419
}
420
 
421
/** Send IPC answer */
1086 palkovsky 422
__native sys_ipc_answer(__native callid, ipc_data_t *data)
1027 palkovsky 423
{
424
    call_t *call;
1040 palkovsky 425
    ipc_data_t saved_data;
1088 palkovsky 426
    int saveddata = 0;
1288 jermar 427
    int rc;
1027 palkovsky 428
 
1346 palkovsky 429
    /* Do not answer notification callids */
430
    if (callid & IPC_CALLID_NOTIFICATION)
431
        return 0;
432
 
1040 palkovsky 433
    call = get_call(callid);
434
    if (!call)
435
        return ENOENT;
1027 palkovsky 436
 
1088 palkovsky 437
    if (answer_need_old(call)) {
1040 palkovsky 438
        memcpy(&saved_data, &call->data, sizeof(call->data));
1088 palkovsky 439
        saveddata = 1;
1027 palkovsky 440
    }
1288 jermar 441
    rc = copy_from_uspace(&call->data.args, &data->args,
1086 palkovsky 442
             sizeof(call->data.args));
1288 jermar 443
    if (rc != 0)
444
        return rc;
1027 palkovsky 445
 
1329 palkovsky 446
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
1027 palkovsky 447
 
448
    ipc_answer(&TASK->answerbox, call);
449
 
1329 palkovsky 450
    return rc;
1027 palkovsky 451
}
452
 
1086 palkovsky 453
/** Hang up the phone
454
 *
455
 */
456
__native sys_ipc_hangup(int phoneid)
457
{
458
    phone_t *phone;
459
 
460
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
461
 
462
    if (ipc_phone_hangup(phone))
463
        return -1;
464
 
465
    return 0;
466
}
467
 
1027 palkovsky 468
/** Wait for incoming ipc call or answer
469
 *
1086 palkovsky 470
 * @param calldata Pointer to buffer where the call/answer data is stored
1027 palkovsky 471
 * @param flags
472
 * @return Callid, if callid & 1, then the call is answer
473
 */
1090 palkovsky 474
__native sys_ipc_wait_for_call(ipc_data_t *calldata, __native flags)
1027 palkovsky 475
{
476
    call_t *call;
477
 
478
restart:   
479
    call = ipc_wait_for_call(&TASK->answerbox, flags);
1088 palkovsky 480
    if (!call)
481
        return 0;
1027 palkovsky 482
 
1258 palkovsky 483
    if (call->flags & IPC_CALL_NOTIF) {
484
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
485
        STRUCT_TO_USPACE(&calldata->args, &call->data.args);
486
        ipc_call_free(call);
487
 
488
        return ((__native)call) | IPC_CALLID_NOTIFICATION;
489
    }
490
 
1027 palkovsky 491
    if (call->flags & IPC_CALL_ANSWERED) {
1090 palkovsky 492
        process_answer(call);
1027 palkovsky 493
 
1086 palkovsky 494
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
495
 
1027 palkovsky 496
        atomic_dec(&TASK->active_calls);
1086 palkovsky 497
 
498
        if (call->flags & IPC_CALL_DISCARD_ANSWER) {
499
            ipc_call_free(call);
500
            goto restart;
501
        }
502
 
503
        STRUCT_TO_USPACE(&calldata->args, &call->data.args);
1027 palkovsky 504
        ipc_call_free(call);
505
 
506
        return ((__native)call) | IPC_CALLID_ANSWERED;
507
    }
1086 palkovsky 508
 
1027 palkovsky 509
    if (process_request(&TASK->answerbox, call))
510
        goto restart;
1086 palkovsky 511
 
1090 palkovsky 512
    /* Include phone address('id') of the caller in the request,
513
     * copy whole call->data, not only call->data.args */
1086 palkovsky 514
    STRUCT_TO_USPACE(calldata, &call->data);
1027 palkovsky 515
    return (__native)call;
516
}
1258 palkovsky 517
 
518
/** Connect irq handler to task */
1281 palkovsky 519
__native sys_ipc_register_irq(__native irq, irq_code_t *ucode)
1258 palkovsky 520
{
1297 jermar 521
    if (!(cap_get(TASK) & CAP_IRQ_REG))
522
        return EPERM;
523
 
1258 palkovsky 524
    if (irq >= IRQ_COUNT)
1297 jermar 525
        return (__native) ELIMIT;
1258 palkovsky 526
 
527
    irq_ipc_bind_arch(irq);
1281 palkovsky 528
 
529
    return ipc_irq_register(&TASK->answerbox, irq, ucode);
1258 palkovsky 530
}
531
 
532
/* Disconnect irq handler from task */
533
__native sys_ipc_unregister_irq(__native irq)
534
{
1297 jermar 535
    if (!(cap_get(TASK) & CAP_IRQ_REG))
536
        return EPERM;
537
 
1258 palkovsky 538
    if (irq >= IRQ_COUNT)
1297 jermar 539
        return (__native) ELIMIT;
1258 palkovsky 540
 
541
    ipc_irq_unregister(&TASK->answerbox, irq);
542
 
543
    return 0;
544
}