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 | #if 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/threadimpl.h> |
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22 | #include <rtems/score/assert.h> |
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23 | #include <rtems/score/schedulerimpl.h> |
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24 | #include <rtems/score/stackimpl.h> |
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25 | #include <rtems/score/sysstate.h> |
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26 | #include <rtems/score/userextimpl.h> |
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27 | #include <rtems/config.h> |
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28 | |
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29 | static void _Thread_Create_idle_for_CPU( Per_CPU_Control *cpu ) |
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30 | { |
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31 | Objects_Name name; |
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32 | Thread_Control *idle; |
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33 | const Scheduler_Control *scheduler; |
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34 | |
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35 | scheduler = _Scheduler_Get_by_CPU( cpu ); |
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36 | |
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37 | #if defined(RTEMS_SMP) |
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38 | if (scheduler == NULL) { |
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39 | return; |
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40 | } |
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41 | #endif |
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42 | |
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43 | name.name_u32 = _Objects_Build_name( 'I', 'D', 'L', 'E' ); |
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44 | |
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45 | /* |
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46 | * The entire workspace is zeroed during its initialization. Thus, all |
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47 | * fields not explicitly assigned were explicitly zeroed by |
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48 | * _Workspace_Initialization. |
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49 | */ |
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50 | idle = _Thread_Internal_allocate(); |
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51 | _Assert( idle != NULL ); |
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52 | |
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53 | _Thread_Initialize( |
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54 | &_Thread_Information, |
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55 | idle, |
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56 | scheduler, |
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57 | NULL, /* allocate the stack */ |
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58 | _Stack_Ensure_minimum( rtems_configuration_get_idle_task_stack_size() ), |
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59 | CPU_IDLE_TASK_IS_FP, |
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60 | _Scheduler_Map_priority( scheduler, scheduler->maximum_priority ), |
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61 | true, /* preemptable */ |
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62 | THREAD_CPU_BUDGET_ALGORITHM_NONE, |
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63 | NULL, /* no budget algorithm callout */ |
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64 | 0, /* all interrupts enabled */ |
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65 | name |
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66 | ); |
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67 | |
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68 | /* |
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69 | * WARNING!!! This is necessary to "kick" start the system and |
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70 | * MUST be done before _Thread_Start is invoked. |
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71 | */ |
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72 | cpu->heir = |
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73 | cpu->executing = idle; |
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74 | |
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75 | idle->is_idle = true; |
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76 | idle->Start.Entry.adaptor = _Thread_Entry_adaptor_idle; |
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77 | idle->Start.Entry.Kinds.Idle.entry = rtems_configuration_get_idle_task(); |
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78 | |
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79 | _Thread_Load_environment( idle ); |
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80 | |
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81 | idle->current_state = STATES_READY; |
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82 | _Scheduler_Start_idle( scheduler, idle, cpu ); |
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83 | _User_extensions_Thread_start( idle ); |
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84 | } |
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85 | |
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86 | void _Thread_Create_idle( void ) |
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87 | { |
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88 | uint32_t cpu_max; |
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89 | uint32_t cpu_index; |
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90 | |
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91 | _System_state_Set( SYSTEM_STATE_BEFORE_MULTITASKING ); |
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92 | cpu_max = _SMP_Get_processor_maximum(); |
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93 | |
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94 | for ( cpu_index = 0 ; cpu_index < cpu_max ; ++cpu_index ) { |
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95 | Per_CPU_Control *cpu = _Per_CPU_Get_by_index( cpu_index ); |
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96 | |
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97 | if ( _Per_CPU_Is_processor_online( cpu ) ) { |
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98 | _Thread_Create_idle_for_CPU( cpu ); |
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99 | } |
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100 | } |
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101 | } |
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