1 | /* |
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2 | * Chain Handler |
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3 | * |
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4 | * COPYRIGHT (c) 1997. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * All rights reserved. |
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7 | * |
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8 | * $Id$ |
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9 | */ |
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10 | |
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11 | #include "system.h" |
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12 | #include "address.h" |
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13 | #include "chain.h" |
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14 | #include "isr.h" |
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15 | |
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16 | /*PAGE |
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17 | * |
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18 | * _Chain_Initialize |
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19 | * |
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20 | * This kernel routine initializes a doubly linked chain. |
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21 | * |
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22 | * Input parameters: |
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23 | * the_chain - pointer to chain header |
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24 | * starting_address - starting address of first node |
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25 | * number_nodes - number of nodes in chain |
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26 | * node_size - size of node in bytes |
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27 | * |
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28 | * Output parameters: NONE |
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29 | */ |
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30 | |
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31 | void _Chain_Initialize( |
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32 | Chain_Control *the_chain, |
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33 | void *starting_address, |
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34 | unsigned32 number_nodes, |
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35 | unsigned32 node_size |
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36 | ) |
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37 | { |
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38 | unsigned32 count; |
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39 | Chain_Node *current; |
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40 | Chain_Node *next; |
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41 | |
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42 | count = number_nodes; |
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43 | current = _Chain_Head( the_chain ); |
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44 | the_chain->permanent_null = NULL; |
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45 | next = (Chain_Node *)starting_address; |
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46 | while ( count-- ) { |
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47 | current->next = next; |
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48 | next->previous = current; |
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49 | current = next; |
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50 | next = (Chain_Node *) |
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51 | _Addresses_Add_offset( (void *) next, node_size ); |
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52 | } |
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53 | current->next = _Chain_Tail( the_chain ); |
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54 | the_chain->last = current; |
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55 | } |
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56 | |
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57 | /*PAGE |
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58 | * |
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59 | * _Chain_Get_first_unprotected |
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60 | */ |
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61 | |
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62 | #ifndef USE_INLINES |
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63 | STATIC INLINE Chain_Node *_Chain_Get_first_unprotected( |
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64 | Chain_Control *the_chain |
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65 | ) |
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66 | { |
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67 | Chain_Node *return_node; |
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68 | Chain_Node *new_first; |
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69 | |
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70 | return_node = the_chain->first; |
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71 | new_first = return_node->next; |
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72 | the_chain->first = new_first; |
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73 | new_first->previous = _Chain_Head( the_chain ); |
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74 | |
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75 | return return_node; |
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76 | } |
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77 | #endif /* USE_INLINES */ |
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78 | |
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79 | /*PAGE |
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80 | * |
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81 | * _Chain_Get |
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82 | * |
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83 | * This kernel routine returns a pointer to a node taken from the |
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84 | * given chain. |
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85 | * |
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86 | * Input parameters: |
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87 | * the_chain - pointer to chain header |
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88 | * |
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89 | * Output parameters: |
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90 | * return_node - pointer to node in chain allocated |
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91 | * CHAIN_END - if no nodes available |
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92 | * |
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93 | * INTERRUPT LATENCY: |
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94 | * only case |
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95 | */ |
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96 | |
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97 | Chain_Node *_Chain_Get( |
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98 | Chain_Control *the_chain |
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99 | ) |
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100 | { |
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101 | ISR_Level level; |
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102 | Chain_Node *return_node; |
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103 | |
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104 | return_node = NULL; |
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105 | _ISR_Disable( level ); |
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106 | if ( !_Chain_Is_empty( the_chain ) ) |
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107 | return_node = _Chain_Get_first_unprotected( the_chain ); |
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108 | _ISR_Enable( level ); |
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109 | return return_node; |
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110 | } |
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111 | |
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112 | /*PAGE |
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113 | * |
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114 | * _Chain_Append |
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115 | * |
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116 | * This kernel routine puts a node on the end of the specified chain. |
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117 | * |
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118 | * Input parameters: |
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119 | * the_chain - pointer to chain header |
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120 | * node - address of node to put at rear of chain |
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121 | * |
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122 | * Output parameters: NONE |
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123 | * |
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124 | * INTERRUPT LATENCY: |
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125 | * only case |
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126 | */ |
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127 | |
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128 | void _Chain_Append( |
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129 | Chain_Control *the_chain, |
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130 | Chain_Node *node |
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131 | ) |
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132 | { |
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133 | ISR_Level level; |
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134 | |
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135 | _ISR_Disable( level ); |
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136 | _Chain_Append_unprotected( the_chain, node ); |
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137 | _ISR_Enable( level ); |
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138 | } |
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139 | |
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140 | /*PAGE |
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141 | * |
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142 | * _Chain_Extract |
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143 | * |
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144 | * This kernel routine deletes the given node from a chain. |
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145 | * |
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146 | * Input parameters: |
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147 | * node - pointer to node in chain to be deleted |
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148 | * |
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149 | * Output parameters: NONE |
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150 | * |
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151 | * INTERRUPT LATENCY: |
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152 | * only case |
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153 | */ |
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154 | |
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155 | void _Chain_Extract( |
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156 | Chain_Node *node |
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157 | ) |
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158 | { |
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159 | ISR_Level level; |
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160 | |
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161 | _ISR_Disable( level ); |
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162 | _Chain_Extract_unprotected( node ); |
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163 | _ISR_Enable( level ); |
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164 | } |
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165 | |
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166 | /*PAGE |
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167 | * |
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168 | * _Chain_Insert |
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169 | * |
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170 | * This kernel routine inserts a given node after a specified node |
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171 | * a requested chain. |
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172 | * |
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173 | * Input parameters: |
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174 | * after_node - pointer to node in chain to be inserted after |
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175 | * node - pointer to node to be inserted |
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176 | * |
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177 | * Output parameters: NONE |
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178 | * |
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179 | * INTERRUPT LATENCY: |
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180 | * only case |
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181 | */ |
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182 | |
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183 | void _Chain_Insert( |
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184 | Chain_Node *after_node, |
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185 | Chain_Node *node |
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186 | ) |
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187 | { |
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188 | ISR_Level level; |
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189 | |
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190 | _ISR_Disable( level ); |
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191 | _Chain_Insert_unprotected( after_node, node ); |
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192 | _ISR_Enable( level ); |
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193 | } |
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194 | |
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195 | /*PAGE |
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196 | * |
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197 | * _Chain_Insert_chain |
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198 | * |
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199 | * This routine inserts a chain after the specified node in another |
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200 | * chain. It is assumed that the insert after node is not on the |
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201 | * second chain. |
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202 | * |
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203 | * Input parameters: |
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204 | * insert_after - insert the chain after this node |
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205 | * to_insert - the chain to insert |
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206 | */ |
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207 | |
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208 | void _Chain_Insert_chain( |
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209 | Chain_Node *insert_after, |
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210 | Chain_Control *to_insert |
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211 | ) |
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212 | { |
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213 | Chain_Node *first; |
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214 | Chain_Node *last; |
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215 | Chain_Node *insert_after_next; |
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216 | |
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217 | first = to_insert->first; |
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218 | last = to_insert->last; |
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219 | |
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220 | insert_after_next = insert_after->next; |
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221 | |
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222 | insert_after->next = first; |
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223 | first->previous = insert_after; |
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224 | |
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225 | insert_after_next->previous = last; |
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226 | last->next = insert_after_next; |
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227 | |
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228 | _Chain_Initialize_empty( to_insert ); |
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229 | } |
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