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1893 | jermar | 1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | #include <ofw_tree.h> |
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30 | #include <ofw.h> |
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31 | #include <types.h> |
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32 | #include <string.h> |
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33 | |||
34 | static ofw_tree_node_t *ofw_tree_node_alloc(void) |
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35 | { |
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36 | return NULL; |
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37 | } |
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38 | |||
39 | static ofw_tree_property_t *ofw_tree_properties_alloc(unsigned count) |
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40 | { |
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41 | return NULL; |
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42 | } |
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43 | |||
44 | static void * ofw_tree_space_alloc(size_t size) |
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45 | { |
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46 | return NULL; |
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47 | } |
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48 | |||
49 | /** Transfer information from one OpenFirmware node into its memory representation. |
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50 | * |
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51 | * Transfer entire information from the OpenFirmware device tree 'current' node to |
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52 | * its memory representation in 'current_node'. This function recursively processes |
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53 | * all node's peers and children. |
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54 | * |
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55 | * @param current_node Pointer to uninitialized ofw_tree_node structure that will |
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56 | * become the memory represenation of 'current'. |
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57 | * @param parent_node Parent ofw_tree_node structure or NULL in case of root node. |
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58 | * @param current OpenFirmware phandle to the current device tree node. |
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59 | */ |
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60 | static void ofw_tree_node_process(ofw_tree_node_t *current_node, |
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61 | ofw_tree_node_t *parent_node, phandle current) |
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62 | { |
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63 | phandle peer; |
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64 | phandle child; |
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65 | unsigned properties = 0; |
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66 | char name[OFW_TREE_PROPERTY_MAX_NAMELEN]; |
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67 | |||
68 | /* |
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69 | * Initialize node. |
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70 | */ |
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71 | current_node->parent = parent_node; |
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72 | current_node->peer = NULL; |
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73 | current_node->child = NULL; |
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74 | current_node->properties = 0; |
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75 | current_node->property = NULL; |
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76 | |||
77 | /* |
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78 | * Recursively process the potential peer node. |
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79 | */ |
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80 | peer = ofw_get_peer_node(current); |
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81 | if (peer != 0 && peer != -1) { |
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82 | ofw_tree_node_t *peer_node; |
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83 | |||
84 | peer_node = ofw_tree_node_alloc(); |
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85 | if (peer_node) { |
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86 | ofw_tree_node_process(peer_node, current_node, peer); |
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87 | current_node->peer = peer_node; |
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88 | } |
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89 | } |
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90 | |||
91 | /* |
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92 | * Recursively process the potential child node. |
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93 | */ |
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94 | child = ofw_get_child_node(current); |
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95 | if (child != 0 && child != -1) { |
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96 | ofw_tree_node_t *child_node; |
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97 | |||
98 | child_node = ofw_tree_node_alloc(); |
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99 | if (child_node) { |
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100 | ofw_tree_node_process(child_node, current_node, child); |
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101 | current_node->child = child_node; |
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102 | } |
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103 | } |
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104 | |||
105 | /* |
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106 | * Count properties. |
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107 | */ |
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108 | name[0] = '\0'; |
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109 | while (ofw_next_property(current, name, name) == 1) |
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110 | current_node->properties++; |
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111 | |||
112 | if (!current_node->properties) |
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113 | return; |
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114 | |||
115 | /* |
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116 | * Copy properties. |
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117 | */ |
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118 | current_node->property = ofw_tree_properties_alloc(current_node->properties); |
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119 | if (!current_node->property) |
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120 | return; |
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121 | |||
122 | int i = 0; |
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123 | |||
124 | name[0] = '\0'; |
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125 | for (i = 0; ofw_next_property(current, name, name) == 1; i++) { |
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126 | size_t size; |
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127 | |||
128 | if (i == current_node->properties) |
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129 | break; |
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130 | |||
131 | strncpy(current_node->property[i].name, name, sizeof(name)); |
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132 | |||
133 | size = ofw_get_proplen(current, name); |
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134 | current_node->property[i].size = size; |
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135 | if (size) { |
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136 | void *buf; |
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137 | |||
138 | buf = ofw_tree_space_alloc(size); |
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139 | if (current_node->property[i].value = buf) { |
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140 | /* |
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141 | * Copy property value to memory node. |
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142 | */ |
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143 | (void) ofw_get_property(current, name, buf, size); |
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144 | } |
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145 | } else { |
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146 | current_node->property[i].value = NULL; |
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147 | } |
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148 | } |
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149 | |||
150 | current_node->properties = i; /* Just in case we ran out of memory. */ |
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151 | } |
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152 | |||
153 | /** Construct memory representation of OpenFirmware device tree. |
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154 | * |
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155 | * @return NULL on failure or pointer to the root node. |
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156 | */ |
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157 | ofw_tree_node_t *ofw_tree_build(void) |
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158 | { |
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159 | ofw_tree_node_t *root; |
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160 | |||
161 | root = ofw_tree_node_alloc(); |
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162 | if (root) |
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163 | ofw_tree_node_process(root, NULL, ofw_root); |
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164 | |||
165 | return root; |
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166 | } |