1 | /** |
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2 | * @file rtems/rtems/region.h |
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3 | * |
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4 | * @defgroup ClassicRegion Regions |
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5 | * |
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6 | * @ingroup ClassicRTEMS |
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7 | * @brief Region Manager |
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8 | * |
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9 | * This include file contains all the constants and structures associated |
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10 | * with the Region Manager. This manager provides facilities to dynamically |
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11 | * allocate memory in variable sized units which are returned as segments. |
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12 | * |
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13 | * Directives provided are: |
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14 | * |
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15 | * - create a region |
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16 | * - get an ID of a region |
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17 | * - delete a region |
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18 | * - get a segment from a region |
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19 | * - return a segment to a region |
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20 | */ |
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21 | |
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22 | /* COPYRIGHT (c) 1989-2009. |
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23 | * On-Line Applications Research Corporation (OAR). |
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24 | * |
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25 | * The license and distribution terms for this file may be |
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26 | * found in the file LICENSE in this distribution or at |
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27 | * http://www.rtems.com/license/LICENSE. |
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28 | */ |
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29 | |
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30 | #ifndef _RTEMS_RTEMS_REGION_H |
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31 | #define _RTEMS_RTEMS_REGION_H |
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32 | |
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33 | #include <rtems/rtems/attr.h> |
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34 | #include <rtems/rtems/options.h> |
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35 | #include <rtems/rtems/status.h> |
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36 | #include <rtems/rtems/types.h> |
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37 | #include <rtems/score/heap.h> |
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38 | #include <rtems/score/threadq.h> |
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39 | |
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40 | #ifdef __cplusplus |
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41 | extern "C" { |
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42 | #endif |
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43 | |
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44 | /** |
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45 | * @defgroup ClassicRegion Regions |
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46 | * |
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47 | * @ingroup ClassicRTEMS |
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48 | * |
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49 | * This encapsulates functionality which XXX |
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50 | */ |
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51 | /**@{*/ |
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52 | |
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53 | /** |
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54 | * The following records define the control block used to manage |
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55 | * each region. |
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56 | */ |
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57 | |
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58 | typedef struct { |
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59 | Objects_Control Object; |
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60 | Thread_queue_Control Wait_queue; /* waiting threads */ |
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61 | void *starting_address; /* physical start addr */ |
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62 | uintptr_t length; /* physical length(bytes) */ |
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63 | uintptr_t page_size; /* in bytes */ |
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64 | uintptr_t maximum_segment_size; /* in bytes */ |
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65 | rtems_attribute attribute_set; |
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66 | uint32_t number_of_used_blocks; /* blocks allocated */ |
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67 | Heap_Control Memory; |
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68 | } Region_Control; |
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69 | |
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70 | /** |
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71 | * @brief rtems_region_create |
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72 | * |
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73 | * Region Manager |
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74 | * |
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75 | * This routine implements the rtems_region_create directive. The |
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76 | * region will have the name name. The memory area managed by |
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77 | * the region is of length bytes and starts at starting_address. |
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78 | * The memory area will be divided into as many allocatable units of |
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79 | * page_size bytes as possible. The attribute_set determines which |
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80 | * thread queue discipline is used by the region. It returns the |
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81 | * id of the created region in ID. |
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82 | */ |
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83 | rtems_status_code rtems_region_create( |
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84 | rtems_name name, |
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85 | void *starting_address, |
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86 | uintptr_t length, |
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87 | uintptr_t page_size, |
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88 | rtems_attribute attribute_set, |
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89 | rtems_id *id |
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90 | ); |
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91 | |
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92 | /** |
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93 | * @brief RTEMS Extend Region |
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94 | * |
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95 | * This routine implements the rtems_region_extend directive. The |
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96 | * region will have the name name. The memory area managed by |
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97 | * the region will be attempted to be grown by length bytes using |
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98 | * the memory starting at starting_address. |
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99 | * |
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100 | * @param[in] id is the id of region to grow |
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101 | * @param[in] starting_address starting address of memory area for extension |
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102 | * @param[in] length is the physical length in bytes to grow the region |
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103 | * |
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104 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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105 | * error. Otherwise, a status code is returned indicating the |
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106 | * source of the error. |
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107 | */ |
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108 | rtems_status_code rtems_region_extend( |
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109 | rtems_id id, |
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110 | void *starting_address, |
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111 | uintptr_t length |
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112 | ); |
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113 | |
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114 | /** |
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115 | * @brief RTEMS Region Name to Id |
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116 | * |
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117 | * This routine implements the rtems_region_ident directive. |
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118 | * This directive returns the region ID associated with name. |
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119 | * If more than one region is named name, then the region |
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120 | * to which the ID belongs is arbitrary. |
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121 | * |
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122 | * @param[in] name is the user defined region name |
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123 | * @param[in] id is the pointer to region id |
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124 | * |
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125 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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126 | * error. Otherwise, a status code is returned indicating the |
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127 | * source of the error. If successful, the id will |
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128 | * be filled in with the region id. |
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129 | */ |
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130 | rtems_status_code rtems_region_ident( |
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131 | rtems_name name, |
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132 | rtems_id *id |
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133 | ); |
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134 | |
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135 | /** |
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136 | * @brief RTEMS Get Region Information |
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137 | * |
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138 | * This routine implements the rtems_region_get_information directive. |
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139 | * This directive returns information about the heap associated with |
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140 | * this region. |
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141 | * |
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142 | * @param[in] id is the region id |
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143 | * @param[in] the_info is the pointer to region information block |
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144 | * |
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145 | * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful and |
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146 | * *id filled with the region information block |
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147 | */ |
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148 | rtems_status_code rtems_region_get_information( |
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149 | rtems_id id, |
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150 | Heap_Information_block *the_info |
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151 | ); |
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152 | |
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153 | /** |
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154 | * @brief RTEMS Get Region Free Information |
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155 | * |
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156 | * This routine implements the rtems_region_get_free_information directive. |
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157 | * This directive returns information about the free blocks in the |
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158 | * heap associated with this region. Information about the used blocks |
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159 | * will be returned as zero. |
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160 | * |
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161 | * @param[in] id is the region id |
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162 | * @param[in] the_info is the pointer to region information block |
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163 | * |
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164 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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165 | * error. Otherwise, a status code is returned indicating the |
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166 | * source of the error. If successful, the the_info will |
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167 | * be filled in with the region information block. |
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168 | */ |
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169 | rtems_status_code rtems_region_get_free_information( |
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170 | rtems_id id, |
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171 | Heap_Information_block *the_info |
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172 | ); |
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173 | |
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174 | /** |
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175 | * @brief RTEMS Delete Region |
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176 | * |
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177 | * This routine implements the rtems_region_delete directive. The |
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178 | * region indicated by ID is deleted, provided that none of its segments are |
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179 | * still allocated. |
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180 | * |
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181 | * @param[in] id is the region id |
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182 | * |
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183 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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184 | * error. Otherwise, a status code is returned indicating the |
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185 | * source of the error. |
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186 | */ |
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187 | rtems_status_code rtems_region_delete( |
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188 | rtems_id id |
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189 | ); |
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190 | |
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191 | /** |
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192 | * @brief RTEMS Get Region Segment |
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193 | * |
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194 | * This routine implements the rtems_region_get_segment directive. It |
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195 | * attempts to allocate a segment from the region associated with @a id. |
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196 | * If a segment of the requested @a size size can be allocated, its address |
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197 | * is returned in @a segment. If no segment is available, then the task |
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198 | * may return immediately or block waiting for a segment with an optional |
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199 | * timeout of @a timeout clock ticks. Whether the task blocks or returns |
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200 | * immediately is based on the no_wait option in the @a option_set. |
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201 | * |
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202 | * @param[in] id is the region id |
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203 | * @param[in] size is the segment size in bytes |
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204 | * @param[in] option_set is the wait option |
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205 | * @param[in] timeout is the number of ticks to wait (0 means wait forever) |
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206 | * @param[in] segment is the pointer to segment address |
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207 | * |
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208 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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209 | * error. Otherwise, a status code is returned indicating the |
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210 | * source of the error. If successful, the segment will |
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211 | * be filled in with the segment address. |
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212 | */ |
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213 | rtems_status_code rtems_region_get_segment( |
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214 | rtems_id id, |
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215 | uintptr_t size, |
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216 | rtems_option option_set, |
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217 | rtems_interval timeout, |
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218 | void **segment |
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219 | ); |
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220 | |
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221 | /** |
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222 | * @brief RTEMS Get Region Segment Size |
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223 | * |
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224 | * This routine implements the rtems_region_get_segment_size directive. It |
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225 | * returns the size in bytes of the specified user memory area. |
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226 | * |
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227 | * @param[in] id is the region id |
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228 | * @param[in] segment is the segment address |
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229 | * @param[in] size is the pointer to segment size in bytes |
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230 | * |
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231 | * @retval This method returns RTEMS_SUCCESSFUL if there was not an |
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232 | * error. Otherwise, a status code is returned indicating the |
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233 | * source of the error. If successful, the size will |
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234 | * be filled in with the segment size in bytes. |
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235 | */ |
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236 | rtems_status_code rtems_region_get_segment_size( |
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237 | rtems_id id, |
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238 | void *segment, |
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239 | uintptr_t *size |
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240 | ); |
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241 | |
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242 | /** |
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243 | * @brief RTEMS Return Region Segment |
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244 | * |
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245 | * This routine implements the rtems_region_return_segment directive. It |
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246 | * frees the segment to the region associated with ID. The segment must |
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247 | * have been previously allocated from the same region. If freeing the |
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248 | * segment results in enough memory being available to satisfy the |
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249 | * rtems_region_get_segment of the first blocked task, then that task and as |
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250 | * many subsequent tasks as possible will be unblocked with their requests |
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251 | * satisfied. |
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252 | * |
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253 | * @param[in] id is the region id |
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254 | * @param[in] segment is the pointer to segment address |
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255 | * |
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256 | * @retval RTEMS_SUCCESSFUL if successful or error code if unsuccessful |
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257 | */ |
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258 | rtems_status_code rtems_region_return_segment( |
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259 | rtems_id id, |
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260 | void *segment |
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261 | ); |
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262 | |
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263 | /** |
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264 | * @brief Resize RTEMS Region Segment |
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265 | * |
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266 | * This routine implements the rtems_region_resize_segment directive. It |
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267 | * tries to resize segment in the region associated with 'id' to the new size |
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268 | * 'size' in place. The first 'size' or old size bytes of the segment |
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269 | * (whatever is less) are guaranteed to remain unmodified. The segment must |
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270 | * have been previously allocated from the same region. If resizing the |
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271 | * segment results in enough memory being available to satisfy the |
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272 | * rtems_region_get_segment of the first blocked task, then that task and as |
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273 | * many subsequent tasks as possible will be unblocked with their requests |
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274 | * satisfied. |
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275 | * |
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276 | * @param[in] id is the region id |
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277 | * @param[in] segment is the pointer to segment address |
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278 | * @param[in] size is the new required size |
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279 | * @retval RTEMS_SUCCESSFUL if operation successful, RTEMS_UNSATISFIED if the |
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280 | * the segment can't be resized in place or any other code at failure |
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281 | * |
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282 | * @note On RTEMS_SUCCESSFUL or RTEMS_UNSATISFIED exit it returns into the |
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283 | * 'old_size' the old size in bytes of the user memory area of the |
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284 | * specified segment. |
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285 | */ |
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286 | rtems_status_code rtems_region_resize_segment( |
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287 | rtems_id id, |
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288 | void *segment, |
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289 | uintptr_t size, |
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290 | uintptr_t *old_size |
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291 | ); |
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292 | |
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293 | /**@}*/ |
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294 | |
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295 | #ifdef __cplusplus |
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296 | } |
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297 | #endif |
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298 | |
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299 | #endif |
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300 | /* end of include file */ |
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