1 | /** |
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2 | * @file rtems/rtems/dpmem.h |
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3 | */ |
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4 | |
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5 | /* |
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6 | * This include file contains all the constants and structures associated |
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7 | * with the Dual Ported Memory Manager. This manager provides a mechanism |
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8 | * for converting addresses between internal and external representations |
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9 | * for multiple dual-ported memory areas. |
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10 | * |
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11 | * Directives provided are: |
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12 | * |
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13 | * + create a port |
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14 | * + get ID of a port |
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15 | * + delete a port |
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16 | * + convert external to internal address |
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17 | * + convert internal to external address |
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18 | * |
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19 | * |
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20 | * COPYRIGHT (c) 1989-1999. |
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21 | * On-Line Applications Research Corporation (OAR). |
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22 | * |
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23 | * The license and distribution terms for this file may be |
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24 | * found in the file LICENSE in this distribution or at |
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25 | * http://www.rtems.com/license/LICENSE. |
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26 | * |
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27 | * $Id$ |
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28 | */ |
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29 | |
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30 | #ifndef __RTEMS_DUAL_PORTED_MEMORY_h |
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31 | #define __RTEMS_DUAL_PORTED_MEMORY_h |
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32 | |
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33 | #ifdef __cplusplus |
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34 | extern "C" { |
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35 | #endif |
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36 | |
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37 | #include <rtems/score/object.h> |
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38 | |
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39 | /* |
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40 | * The following structure defines the port control block. Each port |
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41 | * has a control block associated with it. This control block contains |
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42 | * all information required to support the port related operations. |
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43 | */ |
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44 | |
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45 | typedef struct { |
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46 | Objects_Control Object; |
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47 | void *internal_base; /* base internal address */ |
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48 | void *external_base; /* base external address */ |
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49 | uint32_t length; /* length of dual-ported area */ |
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50 | } Dual_ported_memory_Control; |
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51 | |
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52 | /* |
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53 | * The following define the internal Dual Ported Memory information. |
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54 | */ |
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55 | |
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56 | RTEMS_EXTERN Objects_Information _Dual_ported_memory_Information; |
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57 | |
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58 | /* |
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59 | * _Dual_ported_memory_Manager_initialization |
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60 | * |
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61 | * DESCRIPTION: |
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62 | * |
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63 | * This routine performs the initialization necessary for this manager. |
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64 | */ |
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65 | |
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66 | void _Dual_ported_memory_Manager_initialization( |
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67 | uint32_t maximum_ports |
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68 | ); |
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69 | |
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70 | /* |
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71 | * rtems_port_create |
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72 | * |
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73 | * DESCRIPTION: |
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74 | * |
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75 | * This routine implements the rtems_port_create directive. The port |
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76 | * will have the name name. The port maps onto an area of dual ported |
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77 | * memory of length bytes which has internal_start and external_start |
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78 | * as the internal and external starting addresses, respectively. |
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79 | * It returns the id of the created port in ID. |
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80 | */ |
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81 | |
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82 | rtems_status_code rtems_port_create( |
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83 | rtems_name name, |
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84 | void *internal_start, |
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85 | void *external_start, |
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86 | uint32_t length, |
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87 | Objects_Id *id |
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88 | ); |
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89 | |
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90 | /* |
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91 | * rtems_port_ident |
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92 | * |
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93 | * DESCRIPTION: |
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94 | * |
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95 | * This routine implements the rtems_port_ident directive. This directive |
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96 | * returns the port ID associated with name. If more than one port is |
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97 | * named name, then the port to which the ID belongs is arbitrary. |
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98 | */ |
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99 | |
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100 | rtems_status_code rtems_port_ident( |
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101 | rtems_name name, |
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102 | Objects_Id *id |
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103 | ); |
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104 | |
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105 | /* |
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106 | * rtems_port_delete |
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107 | * |
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108 | * DESCRIPTION: |
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109 | * |
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110 | * This routine implements the rtems_port_delete directive. It deletes |
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111 | * the port associated with ID. |
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112 | */ |
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113 | |
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114 | rtems_status_code rtems_port_delete( |
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115 | Objects_Id id |
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116 | ); |
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117 | |
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118 | /* |
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119 | * rtems_port_external_to_internal |
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120 | * |
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121 | * DESCRIPTION: |
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122 | * |
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123 | * This routine implements the rtems_port_external_to_internal directive. |
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124 | * It returns the internal port address which maps to the provided |
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125 | * external port address for the specified port ID. |
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126 | */ |
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127 | |
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128 | rtems_status_code rtems_port_external_to_internal( |
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129 | Objects_Id id, |
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130 | void *external, |
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131 | void **internal |
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132 | ); |
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133 | |
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134 | /* |
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135 | * rtems_port_internal_to_external |
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136 | * |
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137 | * DESCRIPTION: |
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138 | * |
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139 | * This routine implements the Port_internal_to_external directive. |
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140 | * It returns the external port address which maps to the provided |
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141 | * internal port address for the specified port ID. |
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142 | */ |
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143 | |
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144 | rtems_status_code rtems_port_internal_to_external( |
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145 | Objects_Id id, |
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146 | void *internal, |
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147 | void **external |
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148 | ); |
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149 | |
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150 | #ifndef __RTEMS_APPLICATION__ |
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151 | #include <rtems/rtems/dpmem.inl> |
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152 | #endif |
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153 | |
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154 | #ifdef __cplusplus |
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155 | } |
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156 | #endif |
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157 | |
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158 | #endif |
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159 | /* end of include file */ |
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