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) 1989-1999. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.rtems.com/license/LICENSE. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #if HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <rtems/system.h> |
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20 | #include <rtems/score/address.h> |
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21 | #include <rtems/score/chain.h> |
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22 | #include <rtems/score/object.h> |
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23 | #if defined(RTEMS_MULTIPROCESSING) |
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24 | #include <rtems/score/objectmp.h> |
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25 | #endif |
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26 | #include <rtems/score/thread.h> |
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27 | #include <rtems/score/wkspace.h> |
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28 | #include <rtems/score/sysstate.h> |
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29 | #include <rtems/score/isr.h> |
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30 | |
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31 | #include <string.h> /* for memcpy() */ |
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32 | |
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33 | /*PAGE |
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34 | * |
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35 | * _Objects_Extend_information |
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36 | * |
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37 | * This routine extends all object information related data structures. |
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38 | * |
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39 | * Input parameters: |
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40 | * information - object information table |
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41 | * |
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42 | * Output parameters: NONE |
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43 | */ |
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44 | |
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45 | void _Objects_Extend_information( |
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46 | Objects_Information *information |
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47 | ) |
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48 | { |
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49 | Objects_Control *the_object; |
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50 | Chain_Control Inactive; |
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51 | uint32_t block_count; |
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52 | uint32_t block; |
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53 | uint32_t index_base; |
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54 | uint32_t minimum_index; |
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55 | uint32_t index; |
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56 | uint32_t maximum; |
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57 | size_t block_size; |
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58 | void *new_object_block; |
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59 | |
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60 | /* |
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61 | * Search for a free block of indexes. The block variable ends up set |
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62 | * to block_count + 1 if the table needs to be extended. |
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63 | */ |
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64 | |
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65 | minimum_index = _Objects_Get_index( information->minimum_id ); |
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66 | index_base = minimum_index; |
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67 | block = 0; |
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68 | |
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69 | if ( information->maximum < minimum_index ) |
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70 | block_count = 0; |
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71 | else { |
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72 | block_count = information->maximum / information->allocation_size; |
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73 | |
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74 | for ( ; block < block_count; block++ ) { |
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75 | if ( information->object_blocks[ block ] == NULL ) |
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76 | break; |
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77 | else |
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78 | index_base += information->allocation_size; |
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79 | } |
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80 | } |
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81 | |
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82 | maximum = (uint32_t) information->maximum + information->allocation_size; |
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83 | |
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84 | /* |
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85 | * We need to limit the number of objects to the maximum number |
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86 | * representable in the index portion of the object Id. In the |
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87 | * case of 16-bit Ids, this is only 256 object instances. |
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88 | */ |
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89 | if ( maximum > OBJECTS_ID_FINAL_INDEX ) { |
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90 | return; |
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91 | } |
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92 | |
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93 | /* |
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94 | * Allocate the name table, and the objects and if it fails either return or |
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95 | * generate a fatal error depending on auto-extending being active. |
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96 | */ |
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97 | |
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98 | block_size = information->allocation_size * information->size; |
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99 | if ( information->auto_extend ) { |
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100 | new_object_block = _Workspace_Allocate( block_size ); |
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101 | if ( !new_object_block ) |
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102 | return; |
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103 | } else { |
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104 | new_object_block = _Workspace_Allocate_or_fatal_error( block_size ); |
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105 | } |
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106 | |
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107 | /* |
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108 | * If the index_base is the maximum we need to grow the tables. |
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109 | */ |
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110 | |
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111 | if (index_base >= information->maximum ) { |
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112 | ISR_Level level; |
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113 | void **object_blocks; |
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114 | uint32_t *inactive_per_block; |
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115 | Objects_Control **local_table; |
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116 | void *old_tables; |
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117 | size_t block_size; |
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118 | |
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119 | /* |
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120 | * Growing the tables means allocating a new area, doing a copy and |
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121 | * updating the information table. |
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122 | * |
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123 | * If the maximum is minimum we do not have a table to copy. First |
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124 | * time through. |
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125 | * |
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126 | * The allocation has : |
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127 | * |
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128 | * void *objects[block_count]; |
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129 | * uint32_t inactive_count[block_count]; |
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130 | * Objects_Control *local_table[maximum]; |
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131 | * |
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132 | * This is the order in memory. Watch changing the order. See the memcpy |
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133 | * below. |
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134 | */ |
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135 | |
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136 | /* |
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137 | * Up the block count and maximum |
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138 | */ |
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139 | |
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140 | block_count++; |
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141 | |
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142 | /* |
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143 | * Allocate the tables and break it up. |
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144 | */ |
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145 | |
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146 | block_size = block_count * |
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147 | (sizeof(void *) + sizeof(uint32_t) + sizeof(Objects_Name *)) + |
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148 | ((maximum + minimum_index) * sizeof(Objects_Control *)); |
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149 | object_blocks = (void**) _Workspace_Allocate( block_size ); |
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150 | |
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151 | if ( !object_blocks ) { |
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152 | _Workspace_Free( new_object_block ); |
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153 | return; |
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154 | } |
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155 | |
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156 | /* |
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157 | * Break the block into the various sections. |
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158 | */ |
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159 | |
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160 | inactive_per_block = (uint32_t *) _Addresses_Add_offset( |
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161 | object_blocks, block_count * sizeof(void*) ); |
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162 | local_table = (Objects_Control **) _Addresses_Add_offset( |
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163 | inactive_per_block, block_count * sizeof(uint32_t) ); |
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164 | |
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165 | /* |
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166 | * Take the block count down. Saves all the (block_count - 1) |
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167 | * in the copies. |
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168 | */ |
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169 | |
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170 | block_count--; |
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171 | |
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172 | if ( information->maximum > minimum_index ) { |
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173 | |
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174 | /* |
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175 | * Copy each section of the table over. This has to be performed as |
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176 | * separate parts as size of each block has changed. |
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177 | */ |
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178 | |
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179 | memcpy( object_blocks, |
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180 | information->object_blocks, |
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181 | block_count * sizeof(void*) ); |
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182 | memcpy( inactive_per_block, |
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183 | information->inactive_per_block, |
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184 | block_count * sizeof(uint32_t) ); |
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185 | memcpy( local_table, |
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186 | information->local_table, |
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187 | (information->maximum + minimum_index) * sizeof(Objects_Control *) ); |
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188 | } |
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189 | else { |
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190 | |
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191 | /* |
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192 | * Deal with the special case of the 0 to minimum_index |
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193 | */ |
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194 | for ( index = 0; index < minimum_index; index++ ) { |
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195 | local_table[ index ] = NULL; |
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196 | } |
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197 | } |
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198 | |
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199 | /* |
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200 | * Initialise the new entries in the table. |
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201 | */ |
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202 | |
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203 | object_blocks[block_count] = NULL; |
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204 | inactive_per_block[block_count] = 0; |
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205 | |
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206 | for ( index=index_base ; |
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207 | index < ( information->allocation_size + index_base ); |
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208 | index++ ) { |
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209 | local_table[ index ] = NULL; |
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210 | } |
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211 | |
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212 | _ISR_Disable( level ); |
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213 | |
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214 | old_tables = information->object_blocks; |
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215 | |
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216 | information->object_blocks = object_blocks; |
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217 | information->inactive_per_block = inactive_per_block; |
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218 | information->local_table = local_table; |
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219 | information->maximum = (Objects_Maximum) maximum; |
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220 | information->maximum_id = _Objects_Build_id( |
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221 | information->the_api, |
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222 | information->the_class, |
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223 | _Objects_Local_node, |
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224 | information->maximum |
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225 | ); |
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226 | |
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227 | _ISR_Enable( level ); |
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228 | |
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229 | if ( old_tables ) |
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230 | _Workspace_Free( old_tables ); |
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231 | |
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232 | block_count++; |
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233 | } |
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234 | |
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235 | /* |
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236 | * Assign the new object block to the object block table. |
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237 | */ |
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238 | |
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239 | information->object_blocks[ block ] = new_object_block; |
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240 | |
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241 | /* |
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242 | * Initialize objects .. add to a local chain first. |
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243 | */ |
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244 | |
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245 | _Chain_Initialize( |
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246 | &Inactive, |
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247 | information->object_blocks[ block ], |
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248 | information->allocation_size, |
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249 | information->size |
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250 | ); |
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251 | |
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252 | /* |
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253 | * Move from the local chain, initialise, then append to the inactive chain |
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254 | */ |
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255 | |
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256 | index = index_base; |
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257 | |
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258 | while ( (the_object = (Objects_Control *) _Chain_Get( &Inactive ) ) != NULL ) { |
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259 | |
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260 | the_object->id = _Objects_Build_id( |
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261 | information->the_api, |
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262 | information->the_class, |
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263 | _Objects_Local_node, |
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264 | index |
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265 | ); |
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266 | |
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267 | _Chain_Append( &information->Inactive, &the_object->Node ); |
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268 | |
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269 | index++; |
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270 | } |
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271 | |
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272 | information->inactive_per_block[ block ] = information->allocation_size; |
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273 | information->inactive = |
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274 | (Objects_Maximum)(information->inactive + information->allocation_size); |
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275 | } |
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