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2 pj 1
/*
2
 * Project: S.Ha.R.K.
3
 *
4
 * Coordinators:
5
 *   Giorgio Buttazzo    <giorgio@sssup.it>
6
 *   Paolo Gai           <pj@gandalf.sssup.it>
7
 *
8
 * Authors     :
9
 *   Paolo Gai           <pj@gandalf.sssup.it>
10
 *   (see the web pages for full authors list)
11
 *
12
 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
13
 *
14
 * http://www.sssup.it
15
 * http://retis.sssup.it
16
 * http://shark.sssup.it
17
 */
18
 
19
/**
20
 ------------
545 giacomo 21
 CVS :        $Id: kern.c,v 1.9 2004-03-31 10:40:24 giacomo Exp $
2 pj 22
 
23
 File:        $File$
545 giacomo 24
 Revision:    $Revision: 1.9 $
25
 Last update: $Date: 2004-03-31 10:40:24 $
2 pj 26
 ------------
27
 
28
 This file contains:
29
 
30
 - the kernel system variables
31
 
32
 - the errno functions
33
 
34
 - the scheduler, capacity timer, and grarantee
35
 
36
 - the sys_abort, sys_end, sys_gettime
37
 
38
 
39
**/
40
 
41
/*
42
 * Copyright (C) 2000 Paolo Gai
43
 *
44
 * This program is free software; you can redistribute it and/or modify
45
 * it under the terms of the GNU General Public License as published by
46
 * the Free Software Foundation; either version 2 of the License, or
47
 * (at your option) any later version.
48
 *
49
 * This program is distributed in the hope that it will be useful,
50
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
51
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
52
 * GNU General Public License for more details.
53
 *
54
 * You should have received a copy of the GNU General Public License
55
 * along with this program; if not, write to the Free Software
56
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
57
 *
58
 */
59
 
60
#include <stdarg.h>
61
#include <ll/ll.h>
62
#include <ll/stdlib.h>
63
#include <ll/stdio.h>
64
#include <ll/string.h>
65
#include <kernel/config.h>
66
#include <kernel/model.h>
67
#include <kernel/const.h>
68
#include <sys/types.h>
69
#include <kernel/types.h>
70
#include <kernel/descr.h>
71
#include <errno.h>
72
#include <kernel/var.h>
73
#include <kernel/func.h>
74
 
353 giacomo 75
#include <tracer.h>
76
 
2 pj 77
/*----------------------------------------------------------------------*/
78
/* Kernel System variables                                              */
79
/*----------------------------------------------------------------------*/
80
 
81
int global_errnumber;   /*+ Errno used in system initialization  +*/
82
CONTEXT global_context; /*+ Context used during initialization;
83
                            It references also a safe stack      +*/
84
 
85
int task_counter;       /*+ Application task counter. It represent
86
                            the number of Application tasks in the
87
                            system. When all Application Tasks end,
88
                            also the system ends.                +*/
89
 
90
int system_counter;     /*+ System task counter. It represent
91
                            the number of System tasks in the
92
                            system with the NO_KILL flag reset.
93
                            When all Application Tasks end,
94
                            the system waits for the end of the
95
                            system tasks and then it ends.       +*/
96
 
97
PID exec;               /*+ Task advised by the scheduler        +*/
98
PID exec_shadow;        /*+ Currently executing task             +*/
99
 
29 pj 100
IQUEUE freedesc;        /*+ Free descriptor handled as a queue   +*/
2 pj 101
 
102
DWORD sys_tick;         /*+ System tick (in usec)                +*/
103
struct timespec schedule_time;
104
                        /*+ Timer read at each call to schedule()+*/
105
 
106
int   cap_timer;        /*+ the capacity event posted when the
107
                            task starts                          +*/
108
struct timespec cap_lasttime;
109
                        /*+ the time at whitch the capacity
110
                            event is posted. Normally, it is
111
                            equal to schedule_time               +*/
112
 
113
 
114
 
115
DWORD sched_levels;     /*+ Schedule levels active in the system +*/
116
DWORD res_levels;       /*+ Resource levels active in the system +*/
117
 
118
/*+ Process descriptor table +*/
119
proc_des proc_table[MAX_PROC];
120
 
38 pj 121
/* Scheduling modules descriptor table */
122
/* ------------------------------------------------------------------------ */
123
 
124
/* the descriptor table */
2 pj 125
level_des *level_table[MAX_SCHED_LEVEL];
38 pj 126
/* ... and the size of each descriptor */
127
size_t level_size[MAX_SCHED_LEVEL];
2 pj 128
 
38 pj 129
/* an utilization counter incremented if a level is used by another module */
130
int level_used[MAX_SCHED_LEVEL];
131
/* these data structures (first, last, free, next & prev)
132
   are used to implement a double linked list of scheduling modules.
133
   That list is used by the scheduler to call the module's schedulers. */
134
int level_first; /* first module in the list */
135
int level_last;  /* last module in the list */
136
int level_free;  /* free single linked list of free module descriptors. */
137
int level_next[MAX_SCHED_LEVEL];
138
int level_prev[MAX_SCHED_LEVEL];
139
/* ------------------------------------------------------------------------ */
140
 
2 pj 141
/*+ Resource descriptor table +*/
142
resource_des *resource_table[MAX_RES_LEVEL];
143
 
144
/*+ This variable is set by the system call sys_end() or sys_abort().
145
    When a sys_end() or sys_abort is called into an event handler,
146
    we don't have to change context in the reschedule().
147
    look at kernel/event.c +*/
148
int mustexit = 0;
149
 
150
/*+ this is the system runlevel... it may be from 0 to 4:
151
 
152
    1 - running
153
    2 - shutdown
154
    3 - before halting
155
    4 - halting
156
+*/
157
int runlevel;
158
 
159
/*+ this variable is set to 1 into call_runlevel_func (look at init.c)
160
    ad it is used because the task_activate (look at activate.c) must
161
    work in a different way when the system is in the global_context +*/
162
int calling_runlevel_func;
163
 
164
 
165
/*----------------------------------------------------------------------*/
166
/* Kernel internal functions                                            */
167
/*----------------------------------------------------------------------*/
168
 
169
/*+ errno Handling: this functions returns the correct address for errno.
170
    The address returned can be either the global errno or the errno local
171
    to the execution task */
172
static int *__errnumber()
173
{
174
  if (exec_shadow == -1)
175
    return &global_errnumber;
176
  else
177
    return &(proc_table[exec_shadow].errnumber);
178
}
179
 
180
/*+ this is the capacity timer. it fires when the running task has expired
181
    his time contained in the avail_time field. The event is tipically
182
    posted in the scheduler() after the task_dispatch. The task_dispatch
183
    can modify the avail_time field to reach his scheduling purposes.
184
    The wcet field is NOT used in the Generic kernel. it is initialized at
185
    init time to 0. +*/
186
void capacity_timer(void *arg)
187
{
188
  /* the capacity event is served, so at the epilogue we
189
     don't have to erase it */
190
  cap_timer = NIL;
191
 
192
//  kern_printf("cap%d ",exec_shadow);
193
 
194
  /* When we reschedule, the call to task_epilogue check the slice and
195
     put the task in the queue's tail */
196
  event_need_reschedule();
197
}
198
 
199
/*+
200
  Generic Scheduler:
201
  This function select the next task that should be executed.
202
  The selection is made calling the level schedulers.
203
  It assume that THERE IS a task that can be scheduled in one
204
  level.
205
 
206
  The general scheduler:
207
  - first, it checks for interrupts.
208
  - then, it calls the epilogue of the task pointed in exec_shadow
209
  - after that, it calls the level schedulers
210
  - then it sets exec and it follows the shadow chain
211
  - finally it calls task_dispatch for the new task (the shadow!!!),
212
    saying if exec != exec_shadow
213
 
214
+*/
215
void scheduler(void)
216
{
217
  LEVEL l;    /* a counter                                     */
218
  struct timespec ty; /* a dummy used for time computation     */
219
 
220
  PID p;      /* p is the task chosen by the level scheduler   */
221
  int ok;     /* 1 only if the task chosen by the level scheduler
222
                 is eligible (normally, it is; but in some server
223
                 it is not always true (i.e., CBS))            */
224
 
225
  PID old_exec_shadow;
226
 
227
  if ( (exec_shadow != -1 &&
228
       (proc_table[exec_shadow].control & NO_PREEMPT) ) )
229
    return;
230
 
38 pj 231
  //  kern_printf("(!");
232
 
2 pj 233
  /*
234
  exec_shadow = exec = -1 only if the scheduler is called from:
235
   . task_endcycle
236
   . task_kill
237
   . task_extract
238
   . task_sleep
239
   . task_delay
240
  and from the system startup routines.
241
 
242
  Normally, the scheduler is called with exec & co != -1...
243
 
244
  if exec & co. is set to -1 before calling scheduler(), the following
245
  stuffs have to be executed before the call
246
  - get the schedule_time
247
  - account the capacity if necessary
248
  - call an epilogue
249
  */
250
 
38 pj 251
  /* then, we call the epilogue. the epilogue tipically checks the
252
     avail_time field... */
2 pj 253
  if (exec_shadow != -1) {
38 pj 254
    kern_epilogue_macro();
2 pj 255
 
256
    l = proc_table[exec_shadow].task_level;
38 pj 257
    level_table[l]->public_epilogue(l,exec_shadow);
2 pj 258
  }
259
 
38 pj 260
  //  kern_printf("[");
261
 
262
  l = level_first;
2 pj 263
  for(;;) {
264
    do {
38 pj 265
      p = level_table[l]->public_scheduler(l);
266
      //      kern_printf("p=%d",p);
2 pj 267
      if (p != NIL)
268
        ok = level_table[ proc_table[p].task_level ]->
38 pj 269
          public_eligible(proc_table[p].task_level,p);
2 pj 270
      else
271
        ok = 0;
38 pj 272
      //      kern_printf(" ok=%d",ok);      
2 pj 273
    } while (ok < 0); /* repeat the level scheduler if the task isn't
274
                         eligible... (ex. in the aperiodic servers...) */
275
    if (p != NIL) break;
276
 
38 pj 277
    l = level_next[l];  /* THERE MUST BE a level with a task to schedule */
278
    //    kern_printf(" l=%d",l);      
2 pj 279
  };
280
 
38 pj 281
  //  kern_printf("]");
282
 
2 pj 283
  /* we follow the shadow chain */
284
  old_exec_shadow=exec_shadow;
285
  exec_shadow = exec = p;
286
  while (exec_shadow != proc_table[exec_shadow].shadow)
287
    exec_shadow = proc_table[exec_shadow].shadow;
288
 
289
  /* tracer stuff */
502 giacomo 290
  TRACER_LOGEVENT(FTrace_EVT_task_schedule,(unsigned short int)proc_table[exec_shadow].context,(unsigned int)proc_table[exec].context);
38 pj 291
  //    kern_printf("[%i->%i]",old_exec_shadow,exec_shadow);
2 pj 292
 
293
  /* we control the correctness of the shadows when we kill */
294
  proc_table[exec_shadow].status = EXE;
295
 
38 pj 296
  //  kern_printf("(d%d)",exec_shadow);
2 pj 297
  l = proc_table[exec_shadow].task_level;
38 pj 298
  level_table[l]->public_dispatch(l, exec_shadow, exec!=exec_shadow);
2 pj 299
 
38 pj 300
  //  kern_printf("*");
301
 
2 pj 302
  /* Finally,we post the capacity event, BUT
303
     . only if the task require that
304
     . only if exec==exec_shadow (if a task is blocked we don't want
305
       to check the capacity!!!) */
306
  if ((proc_table[exec_shadow].control & CONTROL_CAP)
307
      && exec==exec_shadow) {
308
    TIMESPEC_ASSIGN(&ty, &schedule_time);
309
    ADDUSEC2TIMESPEC(proc_table[exec_shadow].avail_time,&ty);
38 pj 310
    //    kern_printf("³s%d ns%d sched s%d ns%d³",ty.tv_sec,ty.tv_nsec, schedule_time.tv_sec, schedule_time.tv_nsec);
2 pj 311
    cap_timer = kern_event_post(&ty, capacity_timer, NULL);
312
  }
313
  /* set the time at witch the task is scheduled */
314
  TIMESPEC_ASSIGN(&cap_lasttime, &schedule_time);
315
 
38 pj 316
  //  kern_printf("(s%d)",exec_shadow);
2 pj 317
}
318
 
319
 
320
/*+
321
  Guarantee:
322
  This function guarantees the system: it calls the
323
  level_guarantee of each level that have that function != NULL
324
 
325
  The guarantee is based on a utilization factor basis.
326
  We mantain only a DWORD. num has to be interpreted as num/MAX_DWORD
327
  free bandwidth.
328
+*/
329
int guarantee()
330
{
331
  bandwidth_t num=MAX_BANDWIDTH;
332
  int l;
333
 
38 pj 334
  for (l =0; l<MAX_SCHED_LEVEL && level_table[l]->public_guarantee; l++)
335
    if (!level_table[l]->public_guarantee(l,&num))
2 pj 336
      return -1;
337
 
338
  return 0; /* OK */
339
}
340
 
341
/*----------------------------------------------------------------------*/
342
/* Context switch handling functions                                    */
343
/*----------------------------------------------------------------------*/
344
/* this function is called every time a context change occurs,
345
   when a task is preempted by an event called into an IRQ */
346
void kern_after_dispatch()
347
{
348
  /* every time a task wakes up from an IRQ, it has to check for async
349
     cancellation */
350
  check_killed_async();
351
 
352
  /* Then, look for pending signal delivery */
353
  kern_deliver_pending_signals();
354
}
355
 
356
/*----------------------------------------------------------------------*/
157 pj 357
/* Abort strings                                                        */
358
/*----------------------------------------------------------------------*/
359
 
360
const char *const _sys_abrtlist[] = {
361
  "zero - no error",
362
  "OSLib exception",
363
  "generic unhandled signal raised",
364
  "error in signal_init",
365
  "default exception handler code",
366
  "ARP table full"
367
};
368
 
369
/*----------------------------------------------------------------------*/
2 pj 370
/* Kernel main system functions                                         */
371
/*----------------------------------------------------------------------*/
372
 
373
/*+
374
  This function initialize
375
  - the virtual machine (timer, interrupt, mem)
376
  the system's structures (queues, tables) , & the two task main &
377
  dummy, that are always present
378
+*/
45 pj 379
void __kernel_init__(/* struct multiboot_info *multiboot */ void)
2 pj 380
{
381
  int i,j;                                              /* counters */
382
 
383
  struct ll_initparms parms;                          /* for the VM */
384
 
385
  int aborting;          /* it is set if we are aborting the system */
386
 
45 pj 387
  struct multiboot_info *multiboot=mbi_address();
2 pj 388
 
389
 
390
 
391
  /*
392
   * Runlevel 0: kernel startup
393
   *
394
   *
395
   */
396
 
38 pj 397
  runlevel = RUNLEVEL_STARTUP;
2 pj 398
 
399
  /* The kernel startup MUST proceed with int disabled!    */
400
  kern_cli();
401
 
402
  /* First we initialize the memory allocator, because it is needed by
403
     __kernel_register_levels__     */
404
  kern_mem_init(multiboot);
405
 
406
  /* Clear the task descriptors */
407
  for (i = 0; i < MAX_PROC; i++) {
408
     proc_table[i].task_level   = -1;
409
     proc_table[i].stack        = NULL;
410
     proc_table[i].name[0]      = 0;
411
     proc_table[i].status       = FREE;
412
     proc_table[i].pclass       = 0;
413
     proc_table[i].group        = 0;
414
     proc_table[i].stacksize    = 0;
415
     proc_table[i].control      = 0;
416
     proc_table[i].frozen_activations = 0;
417
     proc_table[i].sigmask      = 0;
418
     proc_table[i].sigpending   = 0;
419
     proc_table[i].avail_time   = 0;
420
     proc_table[i].shadow       = i;
421
     proc_table[i].cleanup_stack= NULL;
422
     proc_table[i].errnumber    = 0;
29 pj 423
     //proc_table[i].priority     = 0;
424
     //NULL_TIMESPEC(&proc_table[i].timespec_priority);
2 pj 425
     proc_table[i].delay_timer  = -1;
426
     proc_table[i].wcet         = -1;
427
 
428
     proc_table[i].jet_tvalid   = 0;
429
     proc_table[i].jet_curr     = 0;
430
     proc_table[i].jet_max      = 0;
431
     proc_table[i].jet_sum      = 0;
432
     proc_table[i].jet_n        = 0;
433
     for (j=0; j<JET_TABLE_DIM; j++)
434
        proc_table[i].jet_table[j] = 0;
435
 
436
     proc_table[i].waiting_for_me = NIL;
437
     proc_table[i].return_value   = NULL;
438
 
439
     for (j=0; j<PTHREAD_KEYS_MAX; j++)
440
       proc_table[i].keys[j] = NULL;
441
  }
442
 
29 pj 443
  /* set up the free descriptor queue */
444
  //  for (i = 0; i < MAX_PROC-1; i++) proc_table[i].next = i+1;
445
  //  proc_table[MAX_PROC-1].next = NIL;
446
  //  for (i = MAX_PROC-1; i > 0; i--) proc_table[i].prev = i-1;
447
  //  proc_table[0].prev = NIL;
448
  //  freedesc = 0;
449
  iq_init(&freedesc, NULL, 0);
450
  for (i = 0; i < MAX_PROC; i++)
451
    iq_insertlast(i,&freedesc);
452
 
2 pj 453
  /* Set up the varius stuff */
454
  global_errnumber = 0;
455
  task_counter     = 0;
456
  system_counter   = 0;
457
  exec             = -1;
458
  exec_shadow      = -1;
459
  cap_timer        = -1;
460
  NULL_TIMESPEC(&cap_lasttime);
461
  sched_levels     = 0;  /* They are not registered yet... */
462
  res_levels       = 0;
463
  calling_runlevel_func = 0;
464
 
465
  /* Clear the key-specific data */
466
  task_specific_data_init();
467
 
468
  /* Clear exit and init functions */
469
  runlevel_init();
470
 
471
  /* Init VM layer (Interrupts, levels & memory management)           */
472
  /* for old exception handling, use excirq_init() */
473
  signals_init();
38 pj 474
  set_default_exception_handler();
2 pj 475
 
38 pj 476
  /* Clear scheduling modules registration data */
477
  levels_init();
478
 
2 pj 479
  sys_tick = __kernel_register_levels__(multiboot);
480
 
481
  /* test on system tick */
482
  if (sys_tick>=55000)  {
483
     printk("The system tick must be less than 55 mSec!");
484
     l1_exit(0);
485
  }
486
 
487
  /* OSLib initialization */
488
  if (sys_tick)
489
    parms.mode = LL_PERIODIC;
490
  else
491
    parms.mode = LL_ONESHOT; // one shot!!!
492
 
493
  parms.tick = sys_tick;
494
 
495
  /*
38 pj 496
   * Runlevel INIT: Let's go!!!!
2 pj 497
   *
498
   *
499
   */
500
 
501
  runlevel = RUNLEVEL_INIT;
502
 
503
  ll_init();
504
  event_init(&parms);
505
  seterrnumber(__errnumber);
506
  event_setprologue(event_resetepilogue);
507
  event_setlasthandler(kern_after_dispatch);
508
 
509
  /* call the init functions */
510
  call_runlevel_func(RUNLEVEL_INIT, 0);
511
 
38 pj 512
 
513
 
514
 
515
  /*
516
   * Runlevel RUNNING: Hoping that all works fine ;-)
517
   *
518
   *
519
   */
520
 
521
  runlevel = RUNLEVEL_RUNNING;
522
 
2 pj 523
  /* tracer stuff */
353 giacomo 524
  #ifdef __OLD_TRACER__
525
    trc_resume();
526
  #endif
2 pj 527
 
528
  /* exec and exec_shadow are already = -1 */
38 pj 529
  kern_gettime(&schedule_time);
2 pj 530
  scheduler();
531
  global_context = ll_context_from(); /* It will be used by sys_end */
532
  ll_context_to(proc_table[exec_shadow].context);
533
 
534
  /*
535
   *
536
   * Now the system starts!!!
537
   * (hoping that someone has created some task(s) )
538
   * The function returns only at system end...
539
   *
540
   */
541
 
542
 
543
  /*
38 pj 544
   * Runlevel SHUTDOWN: Shutting down the system... :-(
2 pj 545
   *
546
   *
547
   */
548
 
549
  event_setlasthandler(NULL);
550
 
551
  // ll_abort(666); 
552
  /* tracer stuff */
353 giacomo 553
  #ifdef __OLD_TRACER__
554
    trc_suspend();
555
  #endif
2 pj 556
 
557
  runlevel = RUNLEVEL_SHUTDOWN;
558
 
559
  /* 1 when the error code is != 0 */
560
  aborting = global_errnumber > 0;
561
 
38 pj 562
  //kern_printf("after  - system_counter=%d, task_counter = %d\n", system_counter,task_counter); 
2 pj 563
 
564
  call_runlevel_func(RUNLEVEL_SHUTDOWN, aborting);
565
 
38 pj 566
  //kern_printf("before - system_counter=%d, task_counter = %d\n", system_counter,task_counter);
2 pj 567
 
568
  if (system_counter) {
569
    /* To shutdown the kernel correctly, we have to wait that all the SYSTEM
570
       tasks that are killable will die...
571
 
572
       We don't mess about the user task... we only kill them and reschedule
573
       The only thing important is that the system tasks shut down correctly.
574
       We do nothing for user tasks that remain active (because, for example,
575
       they have the cancelability set to deferred) when the system goes to
576
       runlevel 3 */
38 pj 577
    //kern_printf("Û%lu",kern_gettime(NULL));
2 pj 578
    kill_user_tasks();
38 pj 579
    //kern_printf("Û%lu",kern_gettime(NULL)); 
2 pj 580
 
581
    /* we have to go again in multitasking mode!!! */
582
    mustexit = 0;
583
 
584
    /* exec and exec_shadow are already = -1 */
38 pj 585
    kern_gettime(&schedule_time);
2 pj 586
    global_context = ll_context_from(); /* It will be used by sys_end */
587
    scheduler();
588
 
589
    event_setlasthandler(kern_after_dispatch);
590
    ll_context_to(proc_table[exec_shadow].context);
591
    event_setlasthandler(NULL);
592
  }
593
 
594
 
595
 
596
 
597
  /*
38 pj 598
   * Runlevel BEFORE_EXIT: Before Halting the system
2 pj 599
   *
600
   *
601
   */
602
 
603
  runlevel = RUNLEVEL_BEFORE_EXIT;
604
 
605
 
606
  /* the field global_errnumber is
607
     =0  if the system normally ends
608
     !=0 if an abort is issued
609
  */
610
 
611
  //kern_printf("Chiamo exit Functions\n"); 
612
 
613
  call_runlevel_func(RUNLEVEL_BEFORE_EXIT, aborting);
614
 
615
  //kern_printf("Dopo exit Functions\n"); 
616
 
617
  /* Shut down the VM layer */
618
  ll_end();
619
 
620
 
621
  /*
38 pj 622
   * Runlevel AFTER_EXIT: After halting...
2 pj 623
   *
624
   *
625
   */
626
 
627
  runlevel = RUNLEVEL_AFTER_EXIT;
628
 
629
  //kern_printf("prima before Functions\n"); 
630
 
631
  call_runlevel_func(RUNLEVEL_AFTER_EXIT, 0);
632
 
633
  //kern_printf("dopo before Functions\n"); 
634
  kern_cli();
635
  if (global_errnumber) {
636
    /* vm_abort called */
157 pj 637
    kern_printf("Abort detected\nCode : %u (%s)\n",global_errnumber,
638
                global_errnumber<=LAST_ABORT_NUMBER ? _sys_abrtlist[global_errnumber] : "no description" );
2 pj 639
    l1_exit(-1);
640
  }
641
 
642
  l1_exit(0); // System terminated normally
643
 
644
}
645
 
38 pj 646
/* IMPORTANT!!!
647
   I'm almost sure the shutdown procedure does not work into interrupts. */
2 pj 648
void internal_sys_end(int i)
649
{
650
  LEVEL l;    /* a counter                                     */
38 pj 651
 
652
  /* if something goes wron during the real mode */
653
  if (runlevel==RUNLEVEL_STARTUP || runlevel==RUNLEVEL_AFTER_EXIT)
654
    l1_exit(i);
2 pj 655
 
656
  //kern_printf("mustexit=%d",mustexit);
38 pj 657
  if (mustexit)
658
    return;
2 pj 659
 
38 pj 660
  mustexit = 1;
2 pj 661
 
38 pj 662
  global_errnumber = i;
663
 
664
 
665
  if (!ll_ActiveInt()) {
666
    proc_table[exec_shadow].context = kern_context_save();
667
 
2 pj 668
    if (exec_shadow != -1) {
38 pj 669
      kern_gettime(&schedule_time);
670
 
671
      kern_epilogue_macro();
672
 
2 pj 673
      /* then, we call the epilogue. the epilogue tipically checks the
38 pj 674
         avail_time field... */
2 pj 675
      l = proc_table[exec_shadow].task_level;
38 pj 676
      level_table[l]->public_epilogue(l,exec_shadow);
677
 
2 pj 678
      exec_shadow = exec = -1;
679
    }
38 pj 680
    kern_context_load(global_context);
681
  }
2 pj 682
 
38 pj 683
  if (ll_ActiveInt()) {
684
    ll_context_to(global_context);
685
    /* The context change will be done when all the interrupts end!!! */
2 pj 686
  }
38 pj 687
 
2 pj 688
  //kern_printf("fine sysend");
689
 
690
  /* the control reach this line only if we call sys_end() into an event
691
     handler (for example, if the event raises an exception with
692
     SA_USEFAST active and the exception calls sys_end() ) */
693
}
694
 
695
 
38 pj 696
/*
697
   Close the system & return to HOST OS.
698
   Can be called from tasks and from ISRS
699
 
700
 
701
*/
702
void sys_abort(int err)
2 pj 703
{
704
  SYS_FLAGS f;
705
 
706
  f = kern_fsave();
38 pj 707
  internal_sys_end(err);
2 pj 708
  kern_frestore(f);
709
}
710
 
38 pj 711
void sys_end(void)
2 pj 712
{
38 pj 713
  sys_abort(0);
2 pj 714
}
715
 
716
void _exit(int status)
717
{
38 pj 718
  sys_abort(status);
2 pj 719
}
720
 
721
 
722
 
723
/* this function is never called... used for the OSLib */
724
void sys_abort_tail(int code)
725
{
726
 //DUMMY!!!!
727
}
728
 
729
 
730
 
731
/*+ this primitive returns the time read from the system timer +*/
732
TIME sys_gettime(struct timespec *t)
733
{
734
  SYS_FLAGS f;
735
  TIME x;
736
 
737
  f = kern_fsave();
38 pj 738
  x = kern_gettime(t);
2 pj 739
  kern_frestore(f);
740
 
741
  return x;
742
}
743
 
744