1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup ScoreSMPImpl |
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5 | * |
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6 | * @brief SuperCore SMP Implementation |
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7 | */ |
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8 | |
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9 | /* |
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10 | * COPYRIGHT (c) 1989-2011. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.org/license/LICENSE. |
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16 | */ |
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17 | |
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18 | #ifndef _RTEMS_SCORE_SMPIMPL_H |
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19 | #define _RTEMS_SCORE_SMPIMPL_H |
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20 | |
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21 | #include <rtems/score/smp.h> |
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22 | #include <rtems/score/percpu.h> |
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23 | #include <rtems/score/processormask.h> |
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24 | #include <rtems/fatal.h> |
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25 | #include <rtems/rtems/cache.h> |
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26 | |
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27 | #ifdef __cplusplus |
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28 | extern "C" { |
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29 | #endif |
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30 | |
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31 | /** |
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32 | * @defgroup ScoreSMP SMP Support |
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33 | * |
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34 | * @ingroup Score |
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35 | * |
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36 | * This defines the interface of the SuperCore SMP support. |
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37 | * |
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38 | * @{ |
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39 | */ |
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40 | |
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41 | /** |
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42 | * @brief SMP message to request a processor shutdown. |
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43 | * |
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44 | * @see _SMP_Send_message(). |
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45 | */ |
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46 | #define SMP_MESSAGE_SHUTDOWN 0x1UL |
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47 | |
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48 | /** |
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49 | * @brief SMP message to request a test handler invocation. |
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50 | * |
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51 | * @see _SMP_Send_message(). |
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52 | */ |
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53 | #define SMP_MESSAGE_TEST 0x2UL |
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54 | |
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55 | /** |
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56 | * @brief SMP message to request a multicast action. |
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57 | * |
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58 | * @see _SMP_Send_message(). |
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59 | */ |
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60 | #define SMP_MESSAGE_MULTICAST_ACTION 0x4UL |
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61 | |
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62 | /** |
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63 | * @brief SMP message to request a clock tick. |
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64 | * |
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65 | * This message is provided for systems without a proper interrupt affinity |
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66 | * support and may be used by the clock driver. |
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67 | * |
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68 | * @see _SMP_Send_message(). |
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69 | */ |
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70 | #define SMP_MESSAGE_CLOCK_TICK 0x8UL |
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71 | |
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72 | /** |
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73 | * @brief SMP fatal codes. |
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74 | */ |
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75 | typedef enum { |
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76 | SMP_FATAL_BOOT_PROCESSOR_NOT_ASSIGNED_TO_SCHEDULER, |
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77 | SMP_FATAL_MANDATORY_PROCESSOR_NOT_PRESENT, |
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78 | SMP_FATAL_MULTITASKING_START_ON_INVALID_PROCESSOR, |
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79 | SMP_FATAL_MULTITASKING_START_ON_UNASSIGNED_PROCESSOR, |
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80 | SMP_FATAL_SHUTDOWN, |
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81 | SMP_FATAL_SHUTDOWN_RESPONSE, |
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82 | SMP_FATAL_START_OF_MANDATORY_PROCESSOR_FAILED |
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83 | } SMP_Fatal_code; |
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84 | |
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85 | static inline void _SMP_Fatal( SMP_Fatal_code code ) |
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86 | { |
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87 | _Terminate( RTEMS_FATAL_SOURCE_SMP, code ); |
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88 | } |
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89 | |
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90 | /** |
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91 | * @brief Initialize SMP Handler |
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92 | * |
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93 | * This method initialize the SMP Handler. |
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94 | */ |
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95 | #if defined( RTEMS_SMP ) |
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96 | void _SMP_Handler_initialize( void ); |
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97 | #else |
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98 | #define _SMP_Handler_initialize() \ |
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99 | do { } while ( 0 ) |
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100 | #endif |
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101 | |
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102 | #if defined( RTEMS_SMP ) |
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103 | |
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104 | /** |
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105 | * @brief Set of online processors. |
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106 | * |
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107 | * A processor is online if was started during system initialization. In this |
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108 | * case its corresponding bit in the mask is set. |
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109 | * |
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110 | * @see _SMP_Handler_initialize(). |
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111 | */ |
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112 | extern Processor_mask _SMP_Online_processors; |
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113 | |
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114 | /** |
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115 | * @brief Performs high-level initialization of a secondary processor and runs |
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116 | * the application threads. |
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117 | * |
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118 | * The low-level initialization code must call this function to hand over the |
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119 | * control of this processor to RTEMS. Interrupts must be disabled. It must |
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120 | * be possible to send inter-processor interrupts to this processor. Since |
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121 | * interrupts are disabled the inter-processor interrupt delivery is postponed |
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122 | * until interrupts are enabled the first time. Interrupts are enabled during |
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123 | * the execution begin of threads in case they have interrupt level zero (this |
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124 | * is the default). |
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125 | * |
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126 | * The pre-requisites for the call to this function are |
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127 | * - disabled interrupts, |
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128 | * - delivery of inter-processor interrupts is possible, |
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129 | * - a valid stack pointer and enough stack space, |
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130 | * - a valid code memory, and |
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131 | * - a valid BSS section. |
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132 | * |
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133 | * This function must not be called by the main processor. The main processor |
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134 | * uses _Thread_Start_multitasking() instead. |
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135 | * |
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136 | * This function does not return to the caller. |
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137 | */ |
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138 | void _SMP_Start_multitasking_on_secondary_processor( void ) |
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139 | RTEMS_NO_RETURN; |
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140 | |
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141 | typedef void ( *SMP_Test_message_handler )( Per_CPU_Control *cpu_self ); |
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142 | |
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143 | extern SMP_Test_message_handler _SMP_Test_message_handler; |
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144 | |
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145 | /** |
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146 | * @brief Sets the handler for test messages. |
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147 | * |
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148 | * This handler can be used to test the inter-processor interrupt |
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149 | * implementation. |
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150 | */ |
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151 | static inline void _SMP_Set_test_message_handler( |
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152 | SMP_Test_message_handler handler |
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153 | ) |
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154 | { |
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155 | _SMP_Test_message_handler = handler; |
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156 | } |
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157 | |
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158 | /** |
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159 | * @brief Processes all pending multicast actions. |
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160 | */ |
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161 | void _SMP_Multicast_actions_process( void ); |
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162 | |
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163 | /** |
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164 | * @brief Interrupt handler for inter-processor interrupts. |
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165 | * |
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166 | * @return The received message. |
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167 | */ |
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168 | static inline long unsigned _SMP_Inter_processor_interrupt_handler( void ) |
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169 | { |
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170 | Per_CPU_Control *cpu_self; |
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171 | unsigned long message; |
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172 | |
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173 | cpu_self = _Per_CPU_Get(); |
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174 | |
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175 | /* |
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176 | * In the common case the inter-processor interrupt is issued to carry out a |
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177 | * thread dispatch. |
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178 | */ |
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179 | cpu_self->dispatch_necessary = true; |
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180 | |
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181 | message = _Atomic_Exchange_ulong( |
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182 | &cpu_self->message, |
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183 | 0, |
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184 | ATOMIC_ORDER_ACQUIRE |
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185 | ); |
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186 | |
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187 | if ( message != 0 ) { |
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188 | if ( ( message & SMP_MESSAGE_SHUTDOWN ) != 0 ) { |
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189 | _SMP_Fatal( SMP_FATAL_SHUTDOWN_RESPONSE ); |
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190 | /* does not continue past here */ |
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191 | } |
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192 | |
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193 | if ( ( message & SMP_MESSAGE_TEST ) != 0 ) { |
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194 | ( *_SMP_Test_message_handler )( cpu_self ); |
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195 | } |
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196 | |
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197 | if ( ( message & SMP_MESSAGE_MULTICAST_ACTION ) != 0 ) { |
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198 | _SMP_Multicast_actions_process(); |
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199 | } |
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200 | } |
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201 | |
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202 | return message; |
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203 | } |
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204 | |
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205 | /** |
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206 | * @brief Returns true, if the processor with the specified index should be |
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207 | * started. |
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208 | * |
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209 | * @param[in] cpu_index The processor index. |
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210 | * |
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211 | * @retval true The processor should be started. |
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212 | * @retval false Otherwise. |
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213 | */ |
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214 | bool _SMP_Should_start_processor( uint32_t cpu_index ); |
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215 | |
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216 | /** |
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217 | * @brief Sends an SMP message to a processor. |
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218 | * |
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219 | * The target processor may be the sending processor. |
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220 | * |
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221 | * @param[in] cpu_index The target processor of the message. |
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222 | * @param[in] message The message. |
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223 | */ |
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224 | void _SMP_Send_message( uint32_t cpu_index, unsigned long message ); |
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225 | |
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226 | /** |
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227 | * @brief Sends an SMP message to all other online processors. |
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228 | * |
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229 | * @param[in] message The message. |
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230 | */ |
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231 | void _SMP_Send_message_broadcast( |
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232 | unsigned long message |
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233 | ); |
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234 | |
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235 | /** |
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236 | * @brief Sends an SMP message to a set of processors. |
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237 | * |
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238 | * The sending processor may be part of the set. |
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239 | * |
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240 | * @param[in] targets The set of processors to send the message. |
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241 | * @param[in] message The message. |
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242 | */ |
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243 | void _SMP_Send_message_multicast( |
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244 | const Processor_mask *targets, |
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245 | unsigned long message |
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246 | ); |
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247 | |
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248 | typedef void ( *SMP_Action_handler )( void *arg ); |
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249 | |
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250 | /** |
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251 | * @brief Initiates an SMP multicast action to a set of processors. |
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252 | * |
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253 | * The current processor may be part of the set. |
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254 | * |
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255 | * @param[in] setsize The size of the set of target processors of the message. |
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256 | * @param[in] cpus The set of target processors of the message. |
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257 | * @param[in] handler The multicast action handler. |
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258 | * @param[in] arg The multicast action argument. |
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259 | */ |
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260 | void _SMP_Multicast_action( |
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261 | const size_t setsize, |
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262 | const cpu_set_t *cpus, |
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263 | SMP_Action_handler handler, |
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264 | void *arg |
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265 | ); |
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266 | |
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267 | /** |
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268 | * @brief Executes a handler with argument on the specified processor on behalf |
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269 | * of the boot processor. |
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270 | * |
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271 | * The calling processor must be the boot processor. In case the specified |
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272 | * processor is not online or not in the |
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273 | * PER_CPU_STATE_READY_TO_START_MULTITASKING state, then no action is |
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274 | * performed. |
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275 | * |
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276 | * @param cpu The processor to execute the action. |
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277 | * @param handler The handler of the action. |
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278 | * @param arg The argument of the action. |
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279 | * |
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280 | * @retval true The handler executed on the specified processor. |
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281 | * @retval false Otherwise. |
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282 | * |
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283 | * @see _SMP_Before_multitasking_action_broadcast(). |
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284 | */ |
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285 | bool _SMP_Before_multitasking_action( |
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286 | Per_CPU_Control *cpu, |
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287 | SMP_Action_handler handler, |
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288 | void *arg |
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289 | ); |
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290 | |
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291 | /** |
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292 | * @brief Executes a handler with argument on all online processors except the |
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293 | * boot processor on behalf of the boot processor. |
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294 | * |
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295 | * The calling processor must be the boot processor. |
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296 | * |
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297 | * @param handler The handler of the action. |
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298 | * @param arg The argument of the action. |
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299 | * |
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300 | * @retval true The handler executed on all online processors except the boot |
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301 | * processor. |
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302 | * @retval false Otherwise. |
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303 | * |
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304 | * @see _SMP_Before_multitasking_action(). |
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305 | */ |
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306 | bool _SMP_Before_multitasking_action_broadcast( |
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307 | SMP_Action_handler handler, |
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308 | void *arg |
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309 | ); |
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310 | |
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311 | #endif /* defined( RTEMS_SMP ) */ |
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312 | |
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313 | /** |
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314 | * @brief Requests a multitasking start on all configured and available |
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315 | * processors. |
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316 | */ |
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317 | #if defined( RTEMS_SMP ) |
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318 | void _SMP_Request_start_multitasking( void ); |
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319 | #else |
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320 | #define _SMP_Request_start_multitasking() \ |
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321 | do { } while ( 0 ) |
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322 | #endif |
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323 | |
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324 | /** |
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325 | * @brief Requests a shutdown of all processors. |
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326 | * |
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327 | * This function is a part of the system termination procedure. |
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328 | * |
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329 | * @see _Terminate(). |
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330 | */ |
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331 | #if defined( RTEMS_SMP ) |
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332 | void _SMP_Request_shutdown( void ); |
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333 | #else |
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334 | #define _SMP_Request_shutdown() \ |
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335 | do { } while ( 0 ) |
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336 | #endif |
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337 | |
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338 | /** @} */ |
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339 | |
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340 | #ifdef __cplusplus |
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341 | } |
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342 | #endif |
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343 | |
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344 | #endif |
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345 | /* end of include file */ |
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