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/config.h> |
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18 | #include <rtems/cpu.h> |
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19 | #include <rtems/fatal.h> |
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20 | #include <rtems/mpci.h> |
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21 | #include <rtems/mppkt.h> |
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22 | #include <rtems/states.h> |
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23 | #include <rtems/thread.h> |
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24 | #include <rtems/threadq.h> |
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25 | #include <rtems/tqdata.h> |
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26 | #include <rtems/watchdog.h> |
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27 | |
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28 | /*PAGE |
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29 | * |
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30 | * _MPCI_Handler_initialization |
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31 | * |
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32 | * This subprogram performs the initialization necessary for this handler. |
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33 | */ |
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34 | |
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35 | void _MPCI_Handler_initialization ( void ) |
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36 | { |
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37 | _Thread_queue_Initialize( |
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38 | &_MPCI_Remote_blocked_threads, |
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39 | RTEMS_FIFO, |
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40 | STATES_WAITING_FOR_RPC_REPLY |
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41 | ); |
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42 | } |
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43 | |
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44 | /*PAGE |
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45 | * |
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46 | * _MPCI_Initialization |
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47 | * |
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48 | * This subprogram initializes the MPCI driver by |
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49 | * invoking the user provided MPCI initialization callout. |
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50 | */ |
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51 | |
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52 | void _MPCI_Initialization ( void ) |
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53 | { |
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54 | (*_Configuration_MPCI_table->initialization)( |
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55 | _Configuration_Table, |
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56 | &_CPU_Table, |
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57 | _Configuration_MP_table |
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58 | ); |
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59 | } |
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60 | |
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61 | /*PAGE |
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62 | * |
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63 | * _MPCI_Get_packet |
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64 | * |
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65 | * This subprogram obtains a packet by invoking the user provided |
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66 | * MPCI get packet callout. |
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67 | */ |
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68 | |
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69 | rtems_packet_prefix *_MPCI_Get_packet ( void ) |
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70 | { |
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71 | rtems_packet_prefix *the_packet; |
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72 | |
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73 | (*_Configuration_MPCI_table->get_packet)( &the_packet ); |
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74 | |
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75 | if ( the_packet == NULL ) |
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76 | rtems_fatal_error_occurred( RTEMS_UNSATISFIED ); |
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77 | |
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78 | /* |
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79 | * Put in a default timeout that will be used for |
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80 | * all packets that do not otherwise have a timeout. |
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81 | */ |
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82 | |
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83 | the_packet->timeout = MPCI_DEFAULT_TIMEOUT; |
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84 | |
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85 | return the_packet; |
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86 | } |
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87 | |
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88 | /*PAGE |
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89 | * |
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90 | * _MPCI_Return_packet |
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91 | * |
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92 | * This subprogram returns a packet by invoking the user provided |
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93 | * MPCI return packet callout. |
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94 | */ |
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95 | |
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96 | void _MPCI_Return_packet ( |
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97 | rtems_packet_prefix *the_packet |
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98 | ) |
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99 | { |
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100 | (*_Configuration_MPCI_table->return_packet)( the_packet ); |
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101 | } |
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102 | |
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103 | /*PAGE |
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104 | * |
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105 | * _MPCI_Send_process_packet |
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106 | * |
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107 | * This subprogram sends a process packet by invoking the user provided |
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108 | * MPCI send callout. |
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109 | */ |
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110 | |
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111 | void _MPCI_Send_process_packet ( |
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112 | unsigned32 destination, |
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113 | rtems_packet_prefix *the_packet |
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114 | ) |
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115 | { |
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116 | the_packet->source_tid = _Thread_Executing->Object.id; |
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117 | the_packet->to_convert = |
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118 | ( the_packet->to_convert - sizeof(rtems_packet_prefix) ) / |
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119 | sizeof(unsigned32); |
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120 | |
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121 | (*_Configuration_MPCI_table->send_packet)( destination, the_packet ); |
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122 | } |
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123 | |
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124 | /*PAGE |
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125 | * |
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126 | * _MPCI_Send_request_packet |
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127 | * |
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128 | * This subprogram sends a request packet by invoking the user provided |
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129 | * MPCI send callout. |
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130 | */ |
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131 | |
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132 | rtems_status_code _MPCI_Send_request_packet ( |
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133 | unsigned32 destination, |
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134 | rtems_packet_prefix *the_packet, |
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135 | States_Control extra_state |
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136 | ) |
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137 | { |
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138 | the_packet->source_tid = _Thread_Executing->Object.id; |
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139 | the_packet->source_priority = _Thread_Executing->current_priority; |
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140 | the_packet->to_convert = |
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141 | ( the_packet->to_convert - sizeof(rtems_packet_prefix) ) / |
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142 | sizeof(unsigned32); |
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143 | |
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144 | _Thread_Executing->Wait.id = the_packet->id; |
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145 | |
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146 | _Thread_Executing->Wait.queue = &_MPCI_Remote_blocked_threads; |
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147 | |
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148 | _Thread_Disable_dispatch(); |
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149 | |
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150 | (*_Configuration_MPCI_table->send_packet)( destination, the_packet ); |
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151 | |
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152 | _MPCI_Remote_blocked_threads.sync = TRUE; |
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153 | |
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154 | /* |
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155 | * See if we need a default timeout |
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156 | */ |
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157 | |
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158 | if (the_packet->timeout == MPCI_DEFAULT_TIMEOUT) |
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159 | the_packet->timeout = _Configuration_MPCI_table->default_timeout; |
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160 | |
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161 | _Thread_queue_Enqueue( &_MPCI_Remote_blocked_threads, the_packet->timeout ); |
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162 | |
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163 | _Thread_Executing->current_state = |
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164 | _States_Set( extra_state, _Thread_Executing->current_state ); |
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165 | |
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166 | _Thread_Enable_dispatch(); |
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167 | |
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168 | return _Thread_Executing->Wait.return_code; |
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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_response_packet |
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174 | * |
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175 | * This subprogram sends a response 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 | void _MPCI_Send_response_packet ( |
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180 | unsigned32 destination, |
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181 | rtems_packet_prefix *the_packet |
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182 | ) |
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183 | { |
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184 | the_packet->source_tid = _Thread_Executing->Object.id; |
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185 | |
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186 | (*_Configuration_MPCI_table->send_packet)( destination, the_packet ); |
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187 | } |
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188 | |
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189 | /*PAGE |
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190 | * |
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191 | * _MPCI_Receive_packet |
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192 | * |
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193 | * This subprogram receives a packet by invoking the user provided |
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194 | * MPCI receive callout. |
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195 | */ |
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196 | |
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197 | rtems_packet_prefix *_MPCI_Receive_packet ( void ) |
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198 | { |
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199 | rtems_packet_prefix *the_packet; |
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200 | |
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201 | (*_Configuration_MPCI_table->receive_packet)( &the_packet ); |
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202 | |
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203 | return the_packet; |
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204 | } |
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205 | |
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206 | /*PAGE |
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207 | * |
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208 | * _MPCI_Process_response |
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209 | * |
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210 | * This subprogram obtains a packet by invoking the user provided |
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211 | * MPCI get packet callout. |
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212 | */ |
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213 | |
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214 | Thread_Control *_MPCI_Process_response ( |
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215 | rtems_packet_prefix *the_packet |
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216 | ) |
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217 | { |
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218 | Thread_Control *the_thread; |
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219 | Objects_Locations location; |
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220 | |
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221 | the_thread = _Thread_Get( the_packet->id, &location ); |
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222 | switch ( location ) { |
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223 | case OBJECTS_ERROR: |
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224 | case OBJECTS_REMOTE: |
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225 | the_thread = NULL; /* IMPOSSIBLE */ |
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226 | break; |
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227 | case OBJECTS_LOCAL: |
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228 | _Thread_queue_Extract( &_MPCI_Remote_blocked_threads, the_thread ); |
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229 | the_thread->Wait.return_code = the_packet->return_code; |
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230 | _Thread_Unnest_dispatch(); |
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231 | break; |
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232 | } |
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233 | |
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234 | return the_thread; |
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235 | } |
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236 | |
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237 | /* end of file */ |
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