1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup RTEMSImplClassic |
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5 | * |
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6 | * @brief This source file contains the implementation of |
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7 | * rtems_scheduler_add_processor(). |
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8 | */ |
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9 | |
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10 | /* |
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11 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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12 | * |
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13 | * embedded brains GmbH |
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14 | * Dornierstr. 4 |
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15 | * 82178 Puchheim |
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16 | * Germany |
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17 | * <rtems@embedded-brains.de> |
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18 | * |
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19 | * The license and distribution terms for this file may be |
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20 | * found in the file LICENSE in this distribution or at |
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21 | * http://www.rtems.org/license/LICENSE. |
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22 | */ |
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23 | |
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24 | #ifdef HAVE_CONFIG_H |
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25 | #include "config.h" |
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26 | #endif |
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27 | |
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28 | #include <rtems/rtems/tasks.h> |
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29 | #include <rtems/score/assert.h> |
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30 | #include <rtems/score/schedulerimpl.h> |
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31 | #include <rtems/config.h> |
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32 | |
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33 | rtems_status_code rtems_scheduler_add_processor( |
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34 | rtems_id scheduler_id, |
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35 | uint32_t cpu_index |
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36 | ) |
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37 | { |
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38 | uint32_t scheduler_index; |
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39 | #if defined(RTEMS_SMP) |
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40 | Per_CPU_Control *cpu; |
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41 | rtems_status_code status; |
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42 | #endif |
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43 | |
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44 | scheduler_index = _Scheduler_Get_index_by_id( scheduler_id ); |
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45 | |
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46 | if ( scheduler_index >= _Scheduler_Count ) { |
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47 | return RTEMS_INVALID_ID; |
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48 | } |
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49 | |
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50 | if ( cpu_index >= rtems_configuration_get_maximum_processors() ) { |
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51 | return RTEMS_NOT_CONFIGURED; |
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52 | } |
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53 | |
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54 | #if defined(RTEMS_SMP) |
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55 | cpu = _Per_CPU_Get_by_index( cpu_index ); |
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56 | |
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57 | if ( _Scheduler_Initial_assignments[ cpu_index ].scheduler == NULL ) { |
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58 | return RTEMS_NOT_CONFIGURED; |
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59 | } |
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60 | |
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61 | if ( !_Per_CPU_Is_processor_online( cpu ) ) { |
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62 | return RTEMS_INCORRECT_STATE; |
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63 | } |
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64 | |
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65 | _Objects_Allocator_lock(); |
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66 | |
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67 | if ( cpu->Scheduler.control == NULL ) { |
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68 | const Scheduler_Control *scheduler; |
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69 | Scheduler_Context *scheduler_context; |
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70 | Priority_Control idle_priority; |
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71 | Thread_Control *idle; |
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72 | Scheduler_Node *scheduler_node; |
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73 | ISR_lock_Context lock_context; |
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74 | Per_CPU_Control *cpu_self; |
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75 | |
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76 | scheduler = &_Scheduler_Table[ scheduler_index ]; |
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77 | scheduler_context = _Scheduler_Get_context( scheduler ); |
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78 | idle_priority = |
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79 | _Scheduler_Map_priority( scheduler, scheduler->maximum_priority ); |
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80 | |
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81 | idle = cpu->Scheduler.idle_if_online_and_unused; |
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82 | _Assert( idle != NULL ); |
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83 | cpu->Scheduler.idle_if_online_and_unused = NULL; |
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84 | |
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85 | idle->Scheduler.home_scheduler = scheduler; |
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86 | idle->Start.initial_priority = idle_priority; |
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87 | scheduler_node = |
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88 | _Thread_Scheduler_get_node_by_index( idle, scheduler_index ); |
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89 | _Priority_Node_set_priority( &idle->Real_priority, idle_priority ); |
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90 | _Priority_Initialize_one( |
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91 | &scheduler_node->Wait.Priority, |
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92 | &idle->Real_priority |
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93 | ); |
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94 | _Assert( _Chain_Is_empty( &idle->Scheduler.Wait_nodes ) ); |
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95 | _Chain_Initialize_one( |
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96 | &idle->Scheduler.Wait_nodes, |
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97 | &scheduler_node->Thread.Wait_node |
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98 | ); |
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99 | _Assert( _Chain_Is_empty( &idle->Scheduler.Scheduler_nodes ) ); |
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100 | _Chain_Initialize_one( |
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101 | &idle->Scheduler.Scheduler_nodes, |
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102 | &scheduler_node->Thread.Scheduler_node.Chain |
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103 | ); |
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104 | |
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105 | _ISR_lock_ISR_disable( &lock_context ); |
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106 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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107 | _Processor_mask_Set( &scheduler_context->Processors, cpu_index ); |
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108 | cpu->Scheduler.control = scheduler; |
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109 | cpu->Scheduler.context = scheduler_context; |
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110 | ( *scheduler->Operations.add_processor )( scheduler, idle ); |
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111 | cpu_self = _Thread_Dispatch_disable_critical( &lock_context ); |
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112 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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113 | _ISR_lock_ISR_enable( &lock_context ); |
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114 | _Thread_Dispatch_direct( cpu_self ); |
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115 | status = RTEMS_SUCCESSFUL; |
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116 | } else { |
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117 | status = RTEMS_RESOURCE_IN_USE; |
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118 | } |
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119 | |
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120 | _Objects_Allocator_unlock(); |
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121 | return status; |
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122 | #else |
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123 | return RTEMS_RESOURCE_IN_USE; |
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124 | #endif |
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125 | } |
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