1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Create Idle Thread |
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5 | * @ingroup RTEMSScoreThread |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2011. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #ifdef HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/score/threadidledata.h> |
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22 | #include <rtems/score/threadimpl.h> |
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23 | #include <rtems/score/assert.h> |
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24 | #include <rtems/score/schedulerimpl.h> |
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25 | #include <rtems/score/stackimpl.h> |
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26 | #include <rtems/score/sysstate.h> |
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27 | #include <rtems/score/userextimpl.h> |
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28 | |
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29 | #include <string.h> |
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30 | |
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31 | static void _Thread_Create_idle_for_CPU( Per_CPU_Control *cpu ) |
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32 | { |
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33 | Thread_Configuration config; |
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34 | Thread_Control *idle; |
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35 | bool ok; |
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36 | |
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37 | memset( &config, 0, sizeof( config ) ); |
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38 | config.scheduler = _Scheduler_Get_by_CPU( cpu ); |
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39 | |
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40 | #if defined(RTEMS_SMP) |
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41 | if ( config.scheduler == NULL ) { |
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42 | return; |
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43 | } |
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44 | #endif |
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45 | |
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46 | config.priority = _Scheduler_Map_priority( |
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47 | config.scheduler, |
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48 | config.scheduler->maximum_priority |
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49 | ); |
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50 | config.budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE; |
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51 | config.name.name_u32 = _Objects_Build_name( 'I', 'D', 'L', 'E' ); |
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52 | config.is_fp = CPU_IDLE_TASK_IS_FP; |
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53 | config.is_preemptible = true; |
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54 | config.stack_size = _Thread_Idle_stack_size |
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55 | + CPU_IDLE_TASK_IS_FP * CONTEXT_FP_SIZE; |
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56 | config.stack_area = &_Thread_Idle_stacks[ |
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57 | _Per_CPU_Get_index( cpu ) * config.stack_size |
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58 | ]; |
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59 | |
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60 | /* |
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61 | * The entire workspace is zeroed during its initialization. Thus, all |
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62 | * fields not explicitly assigned were explicitly zeroed by |
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63 | * _Workspace_Initialization. |
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64 | */ |
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65 | idle = _Thread_Internal_allocate(); |
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66 | _Assert( idle != NULL ); |
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67 | |
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68 | ok = _Thread_Initialize( &_Thread_Information, idle, &config ); |
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69 | _Assert( ok ); |
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70 | (void) ok; |
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71 | |
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72 | /* |
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73 | * WARNING!!! This is necessary to "kick" start the system and |
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74 | * MUST be done before _Thread_Start is invoked. |
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75 | */ |
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76 | cpu->heir = |
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77 | cpu->executing = idle; |
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78 | #if defined(RTEMS_SMP) |
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79 | cpu->ancestor = idle; |
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80 | #endif |
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81 | |
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82 | idle->is_idle = true; |
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83 | idle->Start.Entry.adaptor = _Thread_Entry_adaptor_idle; |
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84 | idle->Start.Entry.Kinds.Idle.entry = _Thread_Idle_body; |
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85 | |
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86 | _Thread_Load_environment( idle ); |
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87 | |
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88 | idle->current_state = STATES_READY; |
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89 | _Scheduler_Start_idle( config.scheduler, idle, cpu ); |
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90 | _User_extensions_Thread_start( idle ); |
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91 | } |
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92 | |
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93 | void _Thread_Create_idle( void ) |
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94 | { |
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95 | uint32_t cpu_max; |
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96 | uint32_t cpu_index; |
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97 | |
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98 | _System_state_Set( SYSTEM_STATE_BEFORE_MULTITASKING ); |
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99 | cpu_max = _SMP_Get_processor_maximum(); |
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100 | |
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101 | for ( cpu_index = 0 ; cpu_index < cpu_max ; ++cpu_index ) { |
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102 | Per_CPU_Control *cpu = _Per_CPU_Get_by_index( cpu_index ); |
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103 | |
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104 | if ( _Per_CPU_Is_processor_online( cpu ) ) { |
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105 | _Thread_Create_idle_for_CPU( cpu ); |
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106 | } |
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107 | } |
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108 | } |
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