1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreThread
*
* @brief This source file contains the implementation of
* _Thread_Start_multitasking().
*/
/*
* COPYRIGHT (c) 1989-2006.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/threadimpl.h>
#include <rtems/score/assert.h>
#include <rtems/score/smpimpl.h>
void _Thread_Start_multitasking( void )
{
Per_CPU_Control *cpu_self = _Per_CPU_Get();
Thread_Control *heir;
#if defined(RTEMS_SMP)
_Per_CPU_Set_state( cpu_self, PER_CPU_STATE_UP );
_SMP_Try_to_process_message( cpu_self, SMP_MESSAGE_FORCE_PROCESSING );
#endif
heir = _Thread_Get_heir_and_make_it_executing( cpu_self );
_Profiling_Thread_dispatch_disable( cpu_self, 0 );
#if defined(RTEMS_SMP)
_CPU_SMP_Prepare_start_multitasking();
#endif
#if defined(_CPU_Start_multitasking)
_CPU_Start_multitasking( &heir->Registers );
#elif defined(RTEMS_SMP)
#if CPU_ENABLE_ROBUST_THREAD_DISPATCH == TRUE
#error "The CPU port has to provide _CPU_Start_multitasking()"
#endif
{
Context_Control trash;
/*
* Mark the trash context as executing to not confuse the
* _CPU_Context_switch(). On SMP configurations the context switch
* contains a special hand over section to atomically switch from the
* executing to the currently selected heir thread.
*/
_CPU_Context_Set_is_executing( &trash, true );
_CPU_Context_switch_no_return( &trash, &heir->Registers );
RTEMS_UNREACHABLE();
}
#else
_CPU_Context_Restart_self( &heir->Registers );
#endif
}
|
