1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief SMP Support |
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5 | * @ingroup Score |
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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.com/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/system.h> |
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22 | #include <rtems/bspsmp.h> |
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23 | #include <rtems/score/smp.h> |
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24 | #include <rtems/score/thread.h> |
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25 | #include <rtems/score/threaddispatch.h> |
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26 | |
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27 | #if defined(RTEMS_DEBUG) |
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28 | #include <rtems/bspIo.h> |
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29 | #endif |
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30 | |
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31 | void rtems_smp_secondary_cpu_initialize( void ) |
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32 | { |
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33 | int self = bsp_smp_processor_id(); |
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34 | Per_CPU_Control *per_cpu = &_Per_CPU_Information[ self ]; |
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35 | Thread_Control *heir; |
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36 | |
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37 | #if defined(RTEMS_DEBUG) |
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38 | printk( "Made it to %d -- ", self ); |
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39 | #endif |
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40 | |
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41 | _Per_CPU_Change_state( per_cpu, PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING ); |
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42 | |
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43 | _Per_CPU_Wait_for_state( per_cpu, PER_CPU_STATE_BEGIN_MULTITASKING ); |
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44 | |
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45 | _Per_CPU_Change_state( per_cpu, PER_CPU_STATE_UP ); |
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46 | |
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47 | /* |
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48 | * The Scheduler will have selected the heir thread for each CPU core. |
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49 | * Now we have been requested to perform the first context switch. So |
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50 | * force a switch to the designated heir and make it executing on |
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51 | * THIS core. |
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52 | */ |
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53 | heir = per_cpu->heir; |
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54 | heir->is_executing = true; |
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55 | per_cpu->executing->is_executing = false; |
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56 | per_cpu->executing = heir; |
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57 | per_cpu->dispatch_necessary = false; |
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58 | |
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59 | /* |
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60 | * Threads begin execution in the _Thread_Handler() function. This function |
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61 | * will call _Thread_Enable_dispatch(). |
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62 | */ |
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63 | _Thread_Disable_dispatch(); |
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64 | |
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65 | _CPU_Context_switch_to_first_task_smp( &heir->Registers ); |
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66 | } |
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67 | |
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68 | void rtems_smp_process_interrupt( void ) |
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69 | { |
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70 | int self = bsp_smp_processor_id(); |
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71 | Per_CPU_Control *per_cpu = &_Per_CPU_Information[ self ]; |
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72 | uint32_t message; |
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73 | ISR_Level level; |
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74 | |
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75 | |
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76 | _Per_CPU_Lock_acquire( per_cpu, level ); |
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77 | message = per_cpu->message; |
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78 | per_cpu->message = 0; |
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79 | _Per_CPU_Lock_release( per_cpu, level ); |
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80 | |
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81 | #if defined(RTEMS_DEBUG) |
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82 | { |
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83 | void *sp = __builtin_frame_address(0); |
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84 | if ( !(message & RTEMS_BSP_SMP_SHUTDOWN) ) { |
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85 | printk( "ISR on CPU %d -- (0x%02x) (0x%p)\n", self, message, sp ); |
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86 | if ( message & RTEMS_BSP_SMP_CONTEXT_SWITCH_NECESSARY ) |
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87 | printk( "context switch necessary\n" ); |
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88 | if ( message & RTEMS_BSP_SMP_SIGNAL_TO_SELF ) |
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89 | printk( "signal to self\n" ); |
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90 | if ( message & RTEMS_BSP_SMP_SHUTDOWN ) |
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91 | printk( "shutdown\n" ); |
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92 | } |
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93 | |
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94 | printk( "Dispatch level %d\n", _Thread_Dispatch_get_disable_level() ); |
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95 | } |
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96 | #endif |
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97 | |
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98 | if ( message & RTEMS_BSP_SMP_SHUTDOWN ) { |
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99 | _ISR_Disable_on_this_core( level ); |
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100 | |
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101 | while ( _Thread_Dispatch_decrement_disable_level() != 0 ) { |
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102 | /* Release completely */ |
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103 | } |
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104 | |
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105 | _Per_CPU_Change_state( per_cpu, PER_CPU_STATE_SHUTDOWN ); |
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106 | |
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107 | _CPU_Fatal_halt( self ); |
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108 | /* does not continue past here */ |
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109 | } |
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110 | } |
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111 | |
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112 | void _SMP_Send_message( int cpu, uint32_t message ) |
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113 | { |
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114 | Per_CPU_Control *per_cpu = &_Per_CPU_Information[ cpu ]; |
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115 | ISR_Level level; |
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116 | |
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117 | #if defined(RTEMS_DEBUG) |
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118 | if ( message & RTEMS_BSP_SMP_SIGNAL_TO_SELF ) |
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119 | printk( "Send 0x%x to %d\n", message, cpu ); |
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120 | #endif |
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121 | |
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122 | _Per_CPU_Lock_acquire( per_cpu, level ); |
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123 | per_cpu->message |= message; |
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124 | _Per_CPU_Lock_release( per_cpu, level ); |
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125 | |
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126 | bsp_smp_interrupt_cpu( cpu ); |
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127 | } |
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128 | |
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129 | void _SMP_Broadcast_message( uint32_t message ) |
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130 | { |
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131 | int self = bsp_smp_processor_id(); |
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132 | int ncpus = _SMP_Get_processor_count(); |
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133 | int cpu; |
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134 | |
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135 | for ( cpu = 0 ; cpu < ncpus ; ++cpu ) { |
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136 | if ( cpu != self ) { |
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137 | Per_CPU_Control *per_cpu = &_Per_CPU_Information[ cpu ]; |
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138 | ISR_Level level; |
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139 | |
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140 | _Per_CPU_Lock_acquire( per_cpu, level ); |
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141 | per_cpu->message |= message; |
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142 | _Per_CPU_Lock_release( per_cpu, level ); |
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143 | } |
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144 | } |
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145 | |
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146 | bsp_smp_broadcast_interrupt(); |
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147 | } |
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148 | |
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149 | void _SMP_Request_other_cores_to_perform_first_context_switch( void ) |
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150 | { |
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151 | int self = bsp_smp_processor_id(); |
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152 | int ncpus = _SMP_Get_processor_count(); |
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153 | int cpu; |
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154 | |
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155 | for ( cpu = 0 ; cpu < ncpus ; ++cpu ) { |
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156 | Per_CPU_Control *per_cpu = &_Per_CPU_Information[ cpu ]; |
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157 | |
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158 | if ( cpu != self ) { |
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159 | _Per_CPU_Change_state( per_cpu, PER_CPU_STATE_BEGIN_MULTITASKING ); |
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160 | } else { |
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161 | |
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162 | _Per_CPU_Change_state( per_cpu, PER_CPU_STATE_UP ); |
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163 | } |
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164 | } |
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165 | } |
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166 | |
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167 | void _SMP_Request_other_cores_to_dispatch( void ) |
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168 | { |
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169 | if ( _System_state_Is_up( _System_state_Get() ) ) { |
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170 | int self = bsp_smp_processor_id(); |
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171 | int ncpus = _SMP_Get_processor_count(); |
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172 | int cpu; |
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173 | |
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174 | for ( cpu = 0 ; cpu < ncpus ; ++cpu ) { |
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175 | const Per_CPU_Control *per_cpu = &_Per_CPU_Information[ cpu ]; |
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176 | |
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177 | if ( |
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178 | cpu != self |
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179 | && per_cpu->state == PER_CPU_STATE_UP |
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180 | && per_cpu->dispatch_necessary |
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181 | ) { |
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182 | _SMP_Send_message( cpu, RTEMS_BSP_SMP_CONTEXT_SWITCH_NECESSARY ); |
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183 | } |
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184 | } |
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185 | } |
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186 | } |
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187 | |
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188 | void _SMP_Request_other_cores_to_shutdown( void ) |
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189 | { |
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190 | int self = bsp_smp_processor_id(); |
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191 | int ncpus = _SMP_Get_processor_count(); |
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192 | int cpu; |
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193 | |
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194 | _SMP_Broadcast_message( RTEMS_BSP_SMP_SHUTDOWN ); |
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195 | |
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196 | for ( cpu = 0 ; cpu < ncpus ; ++cpu ) { |
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197 | if ( cpu != self ) { |
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198 | _Per_CPU_Wait_for_state( |
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199 | &_Per_CPU_Information[ cpu ], |
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200 | PER_CPU_STATE_SHUTDOWN |
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201 | ); |
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202 | } |
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203 | } |
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204 | } |
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