1 | /* |
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2 | * Object 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/chain.h> |
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18 | #include <rtems/core/object.h> |
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19 | #include <rtems/objectmp.h> |
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20 | #include <rtems/core/thread.h> |
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21 | #include <rtems/core/wkspace.h> |
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22 | #include <rtems/sysstate.h> |
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23 | |
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24 | /*PAGE |
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25 | * |
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26 | * _Objects_Handler_initialization |
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27 | * |
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28 | * This routine initializes the object handler. |
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29 | * |
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30 | * Input parameters: |
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31 | * node - local node |
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32 | * maximum_nodes - number of nodes in the system |
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33 | * maximum_global_objects - number of configured global objects |
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34 | * |
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35 | * Output parameters: NONE |
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36 | */ |
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37 | |
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38 | void _Objects_Handler_initialization( |
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39 | unsigned32 node, |
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40 | unsigned32 maximum_nodes, |
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41 | unsigned32 maximum_global_objects |
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42 | ) |
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43 | { |
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44 | if ( node < 1 || node > maximum_nodes ) |
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45 | _Internal_error_Occurred( |
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46 | INTERNAL_ERROR_CORE, |
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47 | TRUE, |
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48 | INTERNAL_ERROR_INVALID_NODE |
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49 | ); |
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50 | |
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51 | _Objects_Local_node = node; |
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52 | _Objects_Maximum_nodes = maximum_nodes; |
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53 | |
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54 | _Objects_MP_Handler_initialization( |
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55 | node, |
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56 | maximum_nodes, |
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57 | maximum_global_objects |
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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 | * _Objects_Initialize_information |
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64 | * |
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65 | * This routine initializes all object information related data structures. |
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66 | * |
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67 | * Input parameters: |
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68 | * information - object information table |
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69 | * the_class - object class |
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70 | * supports_global - TRUE if this is a global object class |
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71 | * maximum - maximum objects of this class |
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72 | * is_string - TRUE if names for this object are strings |
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73 | * size - size of this object's control block |
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74 | * |
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75 | * Output parameters: NONE |
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76 | */ |
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77 | |
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78 | void _Objects_Initialize_information( |
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79 | Objects_Information *information, |
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80 | Objects_Classes the_class, |
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81 | boolean supports_global, |
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82 | unsigned32 maximum, |
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83 | unsigned32 size, |
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84 | boolean is_string, |
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85 | unsigned32 maximum_name_length, |
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86 | boolean is_thread |
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87 | ) |
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88 | { |
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89 | unsigned32 minimum_index; |
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90 | unsigned32 index; |
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91 | Objects_Control *the_object; |
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92 | unsigned32 name_length; |
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93 | void *name_area; |
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94 | |
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95 | information->maximum = maximum; |
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96 | information->the_class = the_class; |
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97 | information->is_string = is_string; |
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98 | information->is_thread = is_thread; |
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99 | |
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100 | /* |
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101 | * Set the entry in the object information table. |
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102 | */ |
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103 | |
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104 | _Objects_Information_table[ the_class ] = information; |
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105 | |
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106 | /* |
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107 | * Calculate minimum and maximum Id's |
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108 | */ |
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109 | |
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110 | if ( maximum == 0 ) minimum_index = 0; |
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111 | else minimum_index = 1; |
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112 | |
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113 | information->minimum_id = |
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114 | _Objects_Build_id( the_class, _Objects_Local_node, minimum_index ); |
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115 | |
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116 | information->maximum_id = |
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117 | _Objects_Build_id( the_class, _Objects_Local_node, maximum ); |
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118 | |
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119 | /* |
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120 | * Allocate local pointer table |
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121 | */ |
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122 | |
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123 | information->local_table = _Workspace_Allocate_or_fatal_error( |
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124 | (maximum + 1) * sizeof(Objects_Control *) |
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125 | ); |
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126 | |
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127 | /* |
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128 | * Allocate name table |
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129 | */ |
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130 | |
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131 | name_length = maximum_name_length; |
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132 | |
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133 | if (name_length & (OBJECTS_NAME_ALIGNMENT-1)) |
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134 | name_length = (name_length + OBJECTS_NAME_ALIGNMENT) & |
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135 | ~(OBJECTS_NAME_ALIGNMENT-1); |
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136 | |
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137 | information->name_length = name_length; |
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138 | |
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139 | name_area = _Workspace_Allocate_or_fatal_error( (maximum + 1) * name_length ); |
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140 | information->name_table = name_area; |
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141 | |
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142 | /* |
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143 | * Initialize local pointer table |
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144 | */ |
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145 | |
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146 | for ( index=0 ; index <= maximum ; index++ ) { |
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147 | information->local_table[ index ] = NULL; |
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148 | } |
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149 | |
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150 | /* |
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151 | * Initialize objects .. if there are any |
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152 | */ |
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153 | |
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154 | if ( maximum == 0 ) { |
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155 | _Chain_Initialize_empty( &information->Inactive ); |
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156 | } else { |
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157 | |
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158 | _Chain_Initialize( |
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159 | &information->Inactive, |
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160 | _Workspace_Allocate_or_fatal_error( maximum * size ), |
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161 | maximum, |
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162 | size |
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163 | ); |
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164 | |
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165 | the_object = (Objects_Control *) information->Inactive.first; |
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166 | for ( index=1; index <= maximum ; index++ ) { |
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167 | the_object->id = |
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168 | _Objects_Build_id( the_class, _Objects_Local_node, index ); |
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169 | |
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170 | the_object->name = (void *) name_area; |
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171 | |
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172 | name_area = _Addresses_Add_offset( name_area, name_length ); |
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173 | |
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174 | the_object = (Objects_Control *) the_object->Node.next; |
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175 | } |
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176 | |
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177 | } |
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178 | |
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179 | /* |
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180 | * Take care of multiprocessing |
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181 | */ |
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182 | |
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183 | if ( supports_global == TRUE && _System_state_Is_multiprocessing ) { |
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184 | |
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185 | information->global_table = _Workspace_Allocate_or_fatal_error( |
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186 | (_Objects_Maximum_nodes + 1) * sizeof(Chain_Control) |
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187 | ); |
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188 | |
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189 | for ( index=1; index <= _Objects_Maximum_nodes ; index++ ) |
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190 | _Chain_Initialize_empty( &information->global_table[ index ] ); |
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191 | } |
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192 | else |
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193 | information->global_table = NULL; |
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194 | } |
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195 | |
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196 | /*PAGE |
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197 | * |
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198 | * _Objects_Clear_name |
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199 | * |
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200 | * XXX |
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201 | */ |
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202 | |
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203 | void _Objects_Clear_name( |
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204 | void *name, |
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205 | unsigned32 length |
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206 | ) |
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207 | { |
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208 | unsigned32 index; |
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209 | unsigned32 maximum = length / OBJECTS_NAME_ALIGNMENT; |
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210 | unsigned32 *name_ptr = name; |
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211 | |
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212 | for ( index=0 ; index < maximum ; index++ ) |
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213 | *name_ptr++ = 0; |
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214 | } |
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215 | |
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216 | /*PAGE |
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217 | * |
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218 | * _Objects_Copy_name_string |
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219 | * |
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220 | * XXX |
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221 | */ |
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222 | |
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223 | void _Objects_Copy_name_string( |
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224 | void *source, |
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225 | void *destination |
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226 | ) |
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227 | { |
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228 | unsigned8 *source_p = source; |
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229 | unsigned8 *destination_p = destination; |
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230 | |
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231 | do { |
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232 | *destination_p++ = *source_p; |
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233 | } while ( *source_p++ ); |
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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 | * _Objects_Copy_name_raw |
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239 | * |
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240 | * XXX |
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241 | */ |
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242 | |
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243 | void _Objects_Copy_name_raw( |
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244 | void *source, |
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245 | void *destination, |
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246 | unsigned32 length |
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247 | ) |
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248 | { |
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249 | unsigned32 *source_p = source; |
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250 | unsigned32 *destination_p = destination; |
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251 | unsigned32 tmp_length = length / OBJECTS_NAME_ALIGNMENT; |
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252 | |
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253 | while ( tmp_length-- ) |
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254 | *destination_p++ = *source_p++; |
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255 | } |
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256 | |
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257 | /*PAGE |
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258 | * |
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259 | * _Objects_Compare_name_string |
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260 | * |
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261 | * XXX |
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262 | */ |
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263 | |
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264 | boolean _Objects_Compare_name_string( |
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265 | void *name_1, |
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266 | void *name_2, |
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267 | unsigned32 length |
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268 | ) |
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269 | { |
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270 | unsigned8 *name_1_p = name_1; |
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271 | unsigned8 *name_2_p = name_2; |
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272 | unsigned32 tmp_length = length; |
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273 | |
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274 | do { |
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275 | if ( *name_1_p++ != *name_2_p++ ) |
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276 | return FALSE; |
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277 | if ( !tmp_length-- ) |
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278 | return FALSE; |
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279 | } while ( *name_1_p ); |
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280 | |
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281 | return TRUE; |
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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 | * _Objects_Compare_name_raw |
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287 | * |
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288 | * XXX |
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289 | */ |
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290 | |
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291 | boolean _Objects_Compare_name_raw( |
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292 | void *name_1, |
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293 | void *name_2, |
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294 | unsigned32 length |
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295 | ) |
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296 | { |
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297 | unsigned32 *name_1_p = name_1; |
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298 | unsigned32 *name_2_p = name_2; |
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299 | unsigned32 tmp_length = length / OBJECTS_NAME_ALIGNMENT; |
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300 | |
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301 | while ( tmp_length-- ) |
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302 | if ( *name_1_p++ != *name_2_p++ ) |
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303 | return FALSE; |
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304 | |
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305 | return TRUE; |
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306 | } |
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307 | |
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308 | |
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309 | /*PAGE |
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310 | * |
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311 | * _Objects_Name_to_id |
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312 | * |
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313 | * These kernel routines search the object table(s) for the given |
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314 | * object name and returns the associated object id. |
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315 | * |
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316 | * Input parameters: |
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317 | * information - object information |
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318 | * name - user defined object name |
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319 | * node - node indentifier (0 indicates any node) |
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320 | * id - address of return ID |
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321 | * |
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322 | * Output parameters: |
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323 | * id - object id |
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324 | * OBJECTS_SUCCESSFUL - if successful |
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325 | * error code - if unsuccessful |
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326 | */ |
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327 | |
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328 | Objects_Name_to_id_errors _Objects_Name_to_id( |
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329 | Objects_Information *information, |
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330 | Objects_Name name, |
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331 | unsigned32 node, |
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332 | Objects_Id *id |
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333 | ) |
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334 | { |
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335 | boolean search_local_node; |
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336 | Objects_Control **objects; |
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337 | Objects_Control *the_object; |
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338 | unsigned32 index; |
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339 | unsigned32 name_length; |
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340 | Objects_Name_comparators compare_them; |
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341 | |
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342 | if ( name == 0 ) |
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343 | return OBJECTS_INVALID_NAME; |
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344 | |
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345 | search_local_node = FALSE; |
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346 | |
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347 | if ( information->maximum != 0 && |
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348 | (node == OBJECTS_SEARCH_ALL_NODES || node == OBJECTS_SEARCH_LOCAL_NODE || |
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349 | _Objects_Is_local_node( node ) ) ) |
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350 | search_local_node = TRUE; |
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351 | |
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352 | if ( search_local_node ) { |
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353 | objects = information->local_table; |
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354 | |
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355 | name_length = information->name_length; |
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356 | |
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357 | if ( information->is_string ) compare_them = _Objects_Compare_name_string; |
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358 | else compare_them = _Objects_Compare_name_raw; |
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359 | |
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360 | for ( index = 1; index <= information->maximum; index++ ) { |
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361 | |
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362 | the_object = objects[ index ]; |
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363 | |
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364 | if ( !the_object || !the_object->name ) |
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365 | continue; |
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366 | |
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367 | if ( (*compare_them)( name, the_object->name, name_length ) ) { |
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368 | *id = the_object->id; |
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369 | return OBJECTS_SUCCESSFUL; |
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370 | } |
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371 | } |
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372 | } |
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373 | |
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374 | if ( _Objects_Is_local_node( node ) || node == OBJECTS_SEARCH_LOCAL_NODE ) |
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375 | return OBJECTS_INVALID_NAME; |
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376 | |
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377 | return ( _Objects_MP_Global_name_search( information, name, node, id ) ); |
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378 | } |
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379 | |
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380 | /*PAGE |
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381 | * |
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382 | * _Objects_Get |
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383 | * |
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384 | * This routine sets the object pointer for the given |
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385 | * object id based on the given object information structure. |
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386 | * |
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387 | * Input parameters: |
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388 | * information - pointer to entry in table for this class |
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389 | * id - object id to search for |
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390 | * location - address of where to store the location |
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391 | * |
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392 | * Output parameters: |
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393 | * returns - address of object if local |
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394 | * location - one of the following: |
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395 | * OBJECTS_ERROR - invalid object ID |
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396 | * OBJECTS_REMOTE - remote object |
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397 | * OBJECTS_LOCAL - local object |
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398 | */ |
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399 | |
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400 | Objects_Control *_Objects_Get( |
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401 | Objects_Information *information, |
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402 | Objects_Id id, |
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403 | Objects_Locations *location |
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404 | ) |
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405 | { |
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406 | Objects_Control *the_object; |
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407 | unsigned32 index; |
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408 | |
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409 | index = id - information->minimum_id; |
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410 | |
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411 | if ( information->maximum >= index ) { |
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412 | _Thread_Disable_dispatch(); |
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413 | if ( (the_object = information->local_table[index+1]) != NULL ) { |
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414 | *location = OBJECTS_LOCAL; |
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415 | return( the_object ); |
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416 | } |
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417 | _Thread_Enable_dispatch(); |
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418 | *location = OBJECTS_ERROR; |
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419 | return( NULL ); |
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420 | } |
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421 | *location = OBJECTS_ERROR; |
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422 | _Objects_MP_Is_remote( information, id, location, &the_object ); |
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423 | return the_object; |
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424 | } |
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425 | |
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426 | |
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427 | /*PAGE |
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428 | * |
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429 | * _Objects_Get_next |
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430 | * |
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431 | * Like _Objects_Get, but considers the 'id' as a "hint" and |
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432 | * finds next valid one after that point. |
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433 | * Mostly used for monitor and debug traversal of an object. |
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434 | * |
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435 | * Input parameters: |
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436 | * information - pointer to entry in table for this class |
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437 | * id - object id to search for |
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438 | * location - address of where to store the location |
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439 | * next_id - address to store next id to try |
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440 | * |
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441 | * Output parameters: |
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442 | * returns - address of object if local |
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443 | * location - one of the following: |
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444 | * OBJECTS_ERROR - invalid object ID |
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445 | * OBJECTS_REMOTE - remote object |
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446 | * OBJECTS_LOCAL - local object |
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447 | * next_id - will contain a reasonable "next" id to continue traversal |
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448 | * |
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449 | * NOTE: |
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450 | * assumes can add '1' to an id to get to next index. |
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451 | */ |
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452 | |
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453 | Objects_Control * |
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454 | _Objects_Get_next( |
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455 | Objects_Information *information, |
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456 | Objects_Id id, |
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457 | unsigned32 *location_p, |
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458 | Objects_Id *next_id_p |
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459 | ) |
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460 | { |
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461 | Objects_Control *object; |
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462 | Objects_Id next_id; |
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463 | |
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464 | if (_Objects_Get_index(id) == OBJECTS_ID_INITIAL_INDEX) |
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465 | next_id = information->minimum_id; |
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466 | else |
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467 | next_id = id; |
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468 | |
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469 | do { |
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470 | /* walked off end of list? */ |
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471 | if (_Objects_Get_index(next_id) > information->maximum) |
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472 | { |
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473 | *location_p = OBJECTS_ERROR; |
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474 | goto final; |
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475 | } |
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476 | |
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477 | /* try to grab one */ |
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478 | object = _Objects_Get(information, next_id, location_p); |
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479 | |
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480 | next_id++; |
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481 | |
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482 | } while (*location_p != OBJECTS_LOCAL); |
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483 | |
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484 | *next_id_p = next_id; |
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485 | return object; |
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486 | |
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487 | final: |
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488 | *next_id_p = OBJECTS_ID_FINAL; |
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489 | return 0; |
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490 | } |
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491 | |
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492 | /*PAGE |
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493 | * |
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494 | * _Objects_Get_information |
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495 | * |
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496 | * XXX |
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497 | */ |
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498 | |
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499 | Objects_Information *_Objects_Get_information( |
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500 | Objects_Id id |
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501 | ) |
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502 | { |
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503 | Objects_Classes the_class; |
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504 | |
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505 | the_class = _Objects_Get_class( id ); |
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506 | |
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507 | if ( !_Objects_Is_class_valid( the_class ) ) |
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508 | return NULL; |
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509 | |
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510 | return _Objects_Information_table[ the_class ]; |
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511 | } |
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512 | |
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