source: rtems/cpukit/score/src/isrsmp.c @ f031df0e

4.115
Last change on this file since f031df0e was d5ef7ae2, checked in by Sebastian Huber <sebastian.huber@…>, on 06/14/13 at 07:14:31

smp: Delete _SMP_Request_other_cores_to_dispatch()

Use an event triggered unicast to inform remote processors about a
necessary thread dispatch instead.

  • Property mode set to 100644
File size: 1.5 KB
Line 
1/**
2 *  @file
3 *
4 *  @brief Initialize, Disable, Enable, Flash, Enter, Exit ISR Implementation
5 *  @ingroup ScoreISR
6 */
7
8/*
9 *  COPYRIGHT (c) 1989-2011.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.com/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#include <rtems/system.h>
22#include <rtems/score/isr.h>
23#include <rtems/score/thread.h>
24#include <rtems/score/threaddispatch.h>
25#include <rtems/score/smp.h>
26
27int _ISR_SMP_Enter(void)
28{
29  uint32_t isr_nest_level;
30  ISR_Level level;
31
32  /* FIXME: Where is the corresponding _ISR_Enable()? */
33  _ISR_Disable( level );
34
35  isr_nest_level = _ISR_Nest_level++;
36
37  _Thread_Disable_dispatch();
38
39  return isr_nest_level;
40}
41
42int _ISR_SMP_Exit(void)
43{
44  ISR_Level level;
45  int       retval;
46
47  retval = 0;
48
49  _ISR_Disable( level );
50
51  _ISR_Nest_level--;
52
53  if ( _ISR_Nest_level == 0 ) {
54    if ( _Thread_Dispatch_necessary ) {
55      if ( _Thread_Dispatch_get_disable_level() == 1 ) {
56        retval = 1;
57      }
58    }
59  }
60
61  /*
62   *  SPARC has special support to avoid some nasty recursive type behaviour.
63   *  When dispatching in a thread and we want to return to it then it needs
64   *  to finish.
65   */
66  #if defined(__sparc__)
67    if ( _CPU_ISR_Dispatch_disable )
68      retval = 0;
69  #endif
70
71  _ISR_Enable( level );
72
73  _Thread_Dispatch_decrement_disable_level();
74
75  return retval;
76}
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