1 | /* |
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2 | * Multiprocessing Communications Interface (MPCI) Handler |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * All rights assigned to U.S. Government, 1994. |
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8 | * |
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9 | * This material may be reproduced by or for the U.S. Government pursuant |
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10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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11 | * notice must appear in all copies of this file and its derivatives. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/core/cpu.h> |
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18 | #include <rtems/core/interr.h> |
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19 | #include <rtems/core/mpci.h> |
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20 | #include <rtems/core/mppkt.h> |
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21 | #include <rtems/core/states.h> |
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22 | #include <rtems/core/thread.h> |
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23 | #include <rtems/core/threadq.h> |
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24 | #include <rtems/core/tqdata.h> |
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25 | #include <rtems/core/watchdog.h> |
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26 | #include <rtems/core/sysstate.h> |
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27 | |
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28 | #include <rtems/core/coresem.h> |
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29 | |
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30 | #include <rtems/rtems/status.h> /* XXX for TIMEOUT */ |
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31 | |
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32 | /*PAGE |
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33 | * |
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34 | * _MPCI_Handler_initialization |
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35 | * |
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36 | * This subprogram performs the initialization necessary for this handler. |
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37 | */ |
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38 | |
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39 | void _MPCI_Handler_initialization( |
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40 | MPCI_Control *users_mpci_table |
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41 | ) |
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42 | { |
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43 | CORE_semaphore_Attributes attributes; |
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44 | |
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45 | if ( _System_state_Is_multiprocessing && !users_mpci_table ) |
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46 | _Internal_error_Occurred( |
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47 | INTERNAL_ERROR_CORE, |
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48 | TRUE, |
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49 | INTERNAL_ERROR_NO_MPCI |
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50 | ); |
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51 | |
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52 | _MPCI_table = users_mpci_table; |
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53 | |
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54 | attributes.discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO; |
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55 | |
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56 | _CORE_semaphore_Initialize( |
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57 | &_MPCI_Semaphore, |
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58 | OBJECTS_NO_CLASS, /* free floating semaphore */ |
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59 | &attributes, /* the_semaphore_attributes */ |
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60 | 0, /* initial_value */ |
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61 | NULL /* proxy_extract_callout */ |
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62 | ); |
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63 | |
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64 | _Thread_queue_Initialize( |
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65 | &_MPCI_Remote_blocked_threads, |
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66 | OBJECTS_NO_CLASS, |
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67 | THREAD_QUEUE_DISCIPLINE_FIFO, |
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68 | STATES_WAITING_FOR_RPC_REPLY, |
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69 | NULL, |
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70 | RTEMS_TIMEOUT /* XXX */ |
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71 | ); |
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72 | } |
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73 | |
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74 | /*PAGE |
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75 | * |
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76 | * _MPCI_Initialization |
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77 | * |
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78 | * This subprogram initializes the MPCI driver by |
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79 | * invoking the user provided MPCI initialization callout. |
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80 | */ |
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81 | |
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82 | void _MPCI_Initialization ( void ) |
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83 | { |
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84 | (*_MPCI_table->initialization)(); |
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85 | } |
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86 | |
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87 | /*PAGE |
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88 | * |
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89 | * _MPCI_Register_packet_processor |
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90 | * |
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91 | * This routine registers the MPCI packet processor for the |
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92 | * designated object class. |
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93 | */ |
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94 | |
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95 | void _MPCI_Register_packet_processor( |
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96 | Objects_Classes the_class, |
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97 | MPCI_Packet_processor the_packet_processor |
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98 | |
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99 | ) |
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100 | { |
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101 | _MPCI_Packet_processors[ the_class ] = the_packet_processor; |
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102 | } |
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103 | |
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104 | /*PAGE |
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105 | * |
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106 | * _MPCI_Get_packet |
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107 | * |
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108 | * This subprogram obtains a packet by invoking the user provided |
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109 | * MPCI get packet callout. |
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110 | */ |
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111 | |
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112 | MP_packet_Prefix *_MPCI_Get_packet ( void ) |
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113 | { |
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114 | MP_packet_Prefix *the_packet; |
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115 | |
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116 | (*_MPCI_table->get_packet)( &the_packet ); |
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117 | |
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118 | if ( the_packet == NULL ) |
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119 | _Internal_error_Occurred( |
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120 | INTERNAL_ERROR_CORE, |
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121 | TRUE, |
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122 | INTERNAL_ERROR_OUT_OF_PACKETS |
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123 | ); |
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124 | |
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125 | /* |
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126 | * Put in a default timeout that will be used for |
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127 | * all packets that do not otherwise have a timeout. |
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128 | */ |
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129 | |
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130 | the_packet->timeout = MPCI_DEFAULT_TIMEOUT; |
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131 | |
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132 | return the_packet; |
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133 | } |
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134 | |
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135 | /*PAGE |
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136 | * |
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137 | * _MPCI_Return_packet |
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138 | * |
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139 | * This subprogram returns a packet by invoking the user provided |
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140 | * MPCI return packet callout. |
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141 | */ |
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142 | |
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143 | void _MPCI_Return_packet ( |
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144 | MP_packet_Prefix *the_packet |
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145 | ) |
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146 | { |
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147 | (*_MPCI_table->return_packet)( the_packet ); |
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148 | } |
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149 | |
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150 | /*PAGE |
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151 | * |
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152 | * _MPCI_Send_process_packet |
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153 | * |
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154 | * This subprogram sends a process packet by invoking the user provided |
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155 | * MPCI send callout. |
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156 | */ |
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157 | |
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158 | void _MPCI_Send_process_packet ( |
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159 | unsigned32 destination, |
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160 | MP_packet_Prefix *the_packet |
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161 | ) |
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162 | { |
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163 | the_packet->source_tid = _Thread_Executing->Object.id; |
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164 | the_packet->to_convert = |
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165 | ( the_packet->to_convert - sizeof(MP_packet_Prefix) ) / |
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166 | sizeof(unsigned32); |
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167 | |
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168 | (*_MPCI_table->send_packet)( destination, the_packet ); |
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169 | } |
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170 | |
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171 | /*PAGE |
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172 | * |
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173 | * _MPCI_Send_request_packet |
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174 | * |
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175 | * This subprogram sends a request packet by invoking the user provided |
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176 | * MPCI send callout. |
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177 | */ |
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178 | |
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179 | unsigned32 _MPCI_Send_request_packet ( |
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180 | unsigned32 destination, |
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181 | MP_packet_Prefix *the_packet, |
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182 | States_Control extra_state |
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183 | ) |
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184 | { |
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185 | the_packet->source_tid = _Thread_Executing->Object.id; |
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186 | the_packet->source_priority = _Thread_Executing->current_priority; |
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187 | the_packet->to_convert = |
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188 | ( the_packet->to_convert - sizeof(MP_packet_Prefix) ) / |
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189 | sizeof(unsigned32); |
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190 | |
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191 | _Thread_Executing->Wait.id = the_packet->id; |
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192 | |
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193 | _Thread_Executing->Wait.queue = &_MPCI_Remote_blocked_threads; |
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194 | |
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195 | _Thread_Disable_dispatch(); |
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196 | |
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197 | (*_MPCI_table->send_packet)( destination, the_packet ); |
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198 | |
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199 | _MPCI_Remote_blocked_threads.sync = TRUE; |
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200 | |
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201 | /* |
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202 | * See if we need a default timeout |
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203 | */ |
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204 | |
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205 | if (the_packet->timeout == MPCI_DEFAULT_TIMEOUT) |
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206 | the_packet->timeout = _MPCI_table->default_timeout; |
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207 | |
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208 | _Thread_queue_Enqueue( &_MPCI_Remote_blocked_threads, the_packet->timeout ); |
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209 | |
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210 | _Thread_Executing->current_state = |
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211 | _States_Set( extra_state, _Thread_Executing->current_state ); |
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212 | |
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213 | _Thread_Enable_dispatch(); |
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214 | |
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215 | return _Thread_Executing->Wait.return_code; |
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216 | } |
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217 | |
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218 | /*PAGE |
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219 | * |
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220 | * _MPCI_Send_response_packet |
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221 | * |
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222 | * This subprogram sends a response packet by invoking the user provided |
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223 | * MPCI send callout. |
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224 | */ |
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225 | |
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226 | void _MPCI_Send_response_packet ( |
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227 | unsigned32 destination, |
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228 | MP_packet_Prefix *the_packet |
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229 | ) |
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230 | { |
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231 | the_packet->source_tid = _Thread_Executing->Object.id; |
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232 | |
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233 | (*_MPCI_table->send_packet)( destination, the_packet ); |
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234 | } |
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235 | |
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236 | /*PAGE |
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237 | * |
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238 | * _MPCI_Receive_packet |
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239 | * |
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240 | * This subprogram receives a packet by invoking the user provided |
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241 | * MPCI receive callout. |
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242 | */ |
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243 | |
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244 | MP_packet_Prefix *_MPCI_Receive_packet ( void ) |
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245 | { |
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246 | MP_packet_Prefix *the_packet; |
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247 | |
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248 | (*_MPCI_table->receive_packet)( &the_packet ); |
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249 | |
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250 | return the_packet; |
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251 | } |
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252 | |
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253 | /*PAGE |
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254 | * |
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255 | * _MPCI_Process_response |
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256 | * |
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257 | * This subprogram obtains a packet by invoking the user provided |
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258 | * MPCI get packet callout. |
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259 | */ |
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260 | |
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261 | Thread_Control *_MPCI_Process_response ( |
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262 | MP_packet_Prefix *the_packet |
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263 | ) |
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264 | { |
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265 | Thread_Control *the_thread; |
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266 | Objects_Locations location; |
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267 | |
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268 | the_thread = _Thread_Get( the_packet->id, &location ); |
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269 | switch ( location ) { |
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270 | case OBJECTS_ERROR: |
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271 | case OBJECTS_REMOTE: |
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272 | the_thread = NULL; /* IMPOSSIBLE */ |
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273 | break; |
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274 | case OBJECTS_LOCAL: |
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275 | _Thread_queue_Extract( &_MPCI_Remote_blocked_threads, the_thread ); |
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276 | the_thread->Wait.return_code = the_packet->return_code; |
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277 | _Thread_Unnest_dispatch(); |
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278 | break; |
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279 | } |
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280 | |
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281 | return the_thread; |
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282 | } |
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283 | |
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284 | /*PAGE |
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285 | * |
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286 | * _MPCI_Receive_server |
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287 | * |
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288 | */ |
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289 | |
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290 | void _MPCI_Receive_server( void ) |
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291 | { |
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292 | |
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293 | MP_packet_Prefix *the_packet; |
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294 | MPCI_Packet_processor the_function; |
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295 | Thread_Control *executing; |
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296 | |
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297 | executing = _Thread_Executing; |
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298 | _MPCI_Receive_server_tcb = executing; |
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299 | |
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300 | for ( ; ; ) { |
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301 | |
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302 | executing->receive_packet = NULL; |
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303 | |
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304 | _Thread_Disable_dispatch(); |
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305 | _CORE_semaphore_Seize( &_MPCI_Semaphore, 0, TRUE, WATCHDOG_NO_TIMEOUT ); |
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306 | _Thread_Enable_dispatch(); |
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307 | |
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308 | for ( ; ; ) { |
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309 | the_packet = _MPCI_Receive_packet(); |
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310 | |
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311 | if ( !the_packet ) |
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312 | break; |
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313 | |
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314 | executing->receive_packet = the_packet; |
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315 | |
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316 | if ( !_Mp_packet_Is_valid_packet_class ( the_packet->the_class ) ) |
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317 | break; |
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318 | |
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319 | the_function = _MPCI_Packet_processors[ the_packet->the_class ]; |
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320 | |
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321 | if ( !the_function ) |
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322 | _Internal_error_Occurred( |
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323 | INTERNAL_ERROR_CORE, |
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324 | TRUE, |
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325 | INTERNAL_ERROR_BAD_PACKET |
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326 | ); |
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327 | |
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328 | (*the_function)( the_packet ); |
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329 | } |
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330 | } |
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331 | } |
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332 | |
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333 | /*PAGE |
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334 | * |
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335 | * _MPCI_Announce |
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336 | * |
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337 | */ |
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338 | |
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339 | void _MPCI_Announce ( void ) |
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340 | { |
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341 | _Thread_Disable_dispatch(); |
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342 | (void) _CORE_semaphore_Surrender( &_MPCI_Semaphore, 0, 0 ); |
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343 | _Thread_Enable_dispatch(); |
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344 | } |
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345 | |
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346 | /* end of file */ |
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