1 | /* |
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2 | * Dual Port Memory Manager |
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3 | * |
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4 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * All rights assigned to U.S. Government, 1994. |
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7 | * |
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8 | * This material may be reproduced by or for the U.S. Government pursuant |
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9 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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10 | * notice must appear in all copies of this file and its derivatives. |
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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 | #include <rtems/system.h> |
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16 | #include <rtems/address.h> |
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17 | #include <rtems/dpmem.h> |
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18 | #include <rtems/object.h> |
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19 | #include <rtems/thread.h> |
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20 | |
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21 | /*PAGE |
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22 | * |
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23 | * _Dual_ported_memory_Manager_initialization |
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24 | * |
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25 | * This routine initializes all dual-ported memory manager related |
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26 | * data structures. |
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27 | * |
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28 | * Input parameters: |
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29 | * maximum_ports - number of ports to initialize |
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30 | * |
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31 | * Output parameters: NONE |
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32 | */ |
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33 | |
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34 | void _Dual_ported_memory_Manager_initialization( |
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35 | unsigned32 maximum_ports |
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36 | ) |
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37 | { |
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38 | _Objects_Initialize_information( |
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39 | &_Dual_ported_memory_Information, |
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40 | FALSE, |
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41 | maximum_ports, |
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42 | sizeof( Dual_ported_memory_Control ) |
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43 | ); |
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44 | } |
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45 | |
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46 | /*PAGE |
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47 | * |
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48 | * rtems_port_create |
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49 | * |
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50 | * This directive creates a port into a dual-ported memory area. |
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51 | * |
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52 | * Input parameters: |
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53 | * name - user defined port name |
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54 | * internal_start - internal start address of port |
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55 | * external_start - external start address of port |
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56 | * length - physical length in bytes |
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57 | * id - address of port id to set |
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58 | * |
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59 | * Output parameters: |
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60 | * id - port id |
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61 | * RTEMS_SUCCESSFUL - if successful |
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62 | * error code - if unsuccessful |
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63 | */ |
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64 | |
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65 | rtems_status_code rtems_port_create( |
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66 | Objects_Name name, |
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67 | void *internal_start, |
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68 | void *external_start, |
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69 | unsigned32 length, |
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70 | Objects_Id *id |
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71 | ) |
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72 | { |
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73 | register Dual_ported_memory_Control *the_port; |
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74 | |
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75 | if ( !_Objects_Is_name_valid( name) ) |
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76 | return ( RTEMS_INVALID_NAME ); |
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77 | |
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78 | if ( !_Addresses_Is_aligned( internal_start ) || |
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79 | !_Addresses_Is_aligned( external_start ) ) |
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80 | return( RTEMS_INVALID_ADDRESS ); |
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81 | |
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82 | _Thread_Disable_dispatch(); /* to prevent deletion */ |
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83 | |
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84 | the_port = _Dual_ported_memory_Allocate(); |
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85 | |
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86 | if ( !the_port ) { |
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87 | _Thread_Enable_dispatch(); |
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88 | return( RTEMS_TOO_MANY ); |
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89 | } |
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90 | |
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91 | the_port->internal_base = internal_start; |
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92 | the_port->external_base = external_start; |
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93 | the_port->length = length - 1; |
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94 | |
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95 | _Objects_Open( &_Dual_ported_memory_Information, |
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96 | &the_port->Object, name ); |
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97 | *id = the_port->Object.id; |
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98 | _Thread_Enable_dispatch(); |
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99 | return( RTEMS_SUCCESSFUL ); |
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100 | } |
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101 | |
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102 | /*PAGE |
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103 | * |
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104 | * rtems_port_ident |
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105 | * |
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106 | * This directive returns the system ID associated with |
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107 | * the port name. |
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108 | * |
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109 | * Input parameters: |
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110 | * name - user defined port name |
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111 | * id - pointer to port id |
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112 | * |
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113 | * Output parameters: |
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114 | * *id - port id |
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115 | * RTEMS_SUCCESSFUL - if successful |
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116 | * error code - if unsuccessful |
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117 | */ |
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118 | |
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119 | rtems_status_code rtems_port_ident( |
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120 | Objects_Name name, |
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121 | Objects_Id *id |
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122 | ) |
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123 | { |
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124 | return( |
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125 | _Objects_Name_to_id( |
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126 | &_Dual_ported_memory_Information, |
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127 | name, |
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128 | RTEMS_SEARCH_ALL_NODES, |
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129 | id |
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130 | ) |
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131 | ); |
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132 | } |
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133 | |
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134 | /*PAGE |
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135 | * |
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136 | * rtems_port_delete |
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137 | * |
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138 | * This directive allows a thread to delete a dual-ported memory area |
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139 | * specified by the dual-ported memory identifier. |
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140 | * |
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141 | * Input parameters: |
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142 | * id - dual-ported memory area id |
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143 | * |
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144 | * Output parameters: |
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145 | * RTEMS_SUCCESSFUL - if successful |
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146 | * error code - if unsuccessful |
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147 | */ |
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148 | |
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149 | rtems_status_code rtems_port_delete( |
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150 | Objects_Id id |
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151 | ) |
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152 | { |
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153 | register Dual_ported_memory_Control *the_port; |
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154 | Objects_Locations location; |
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155 | |
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156 | the_port = _Dual_ported_memory_Get( id, &location ); |
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157 | switch ( location ) { |
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158 | case OBJECTS_ERROR: |
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159 | return( RTEMS_INVALID_ID ); |
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160 | case OBJECTS_REMOTE: /* this error cannot be returned */ |
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161 | return( RTEMS_INTERNAL_ERROR ); |
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162 | case OBJECTS_LOCAL: |
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163 | _Objects_Close( &_Dual_ported_memory_Information, &the_port->Object ); |
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164 | _Dual_ported_memory_Free( the_port ); |
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165 | _Thread_Enable_dispatch(); |
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166 | return( RTEMS_SUCCESSFUL ); |
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167 | } |
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168 | |
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169 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
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170 | } |
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171 | |
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172 | /*PAGE |
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173 | * |
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174 | * rtems_port_internal_to_external |
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175 | * |
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176 | * This directive converts an internal dual-ported memory address to an |
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177 | * external dual-ported memory address. If the given internal address |
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178 | * is an invalid dual-ported address, then the external address is set |
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179 | * to the given internal address. |
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180 | * |
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181 | * Input parameters: |
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182 | * id - id of dual-ported memory object |
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183 | * internal - internal address to set |
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184 | * external - pointer to external address |
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185 | * |
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186 | * Output parameters: |
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187 | * external - external address |
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188 | * RTEMS_SUCCESSFUL - always succeeds |
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189 | */ |
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190 | |
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191 | rtems_status_code rtems_port_internal_to_external( |
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192 | Objects_Id id, |
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193 | void *internal, |
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194 | void **external |
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195 | ) |
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196 | { |
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197 | register Dual_ported_memory_Control *the_port; |
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198 | Objects_Locations location; |
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199 | unsigned32 ending; |
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200 | |
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201 | the_port = _Dual_ported_memory_Get( id, &location ); |
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202 | switch ( location ) { |
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203 | case OBJECTS_ERROR: |
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204 | return( RTEMS_INVALID_ID ); |
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205 | case OBJECTS_REMOTE: /* this error cannot be returned */ |
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206 | return( RTEMS_INTERNAL_ERROR ); |
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207 | case OBJECTS_LOCAL: |
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208 | ending = _Addresses_Subtract( internal, the_port->internal_base ); |
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209 | if ( ending > the_port->length ) |
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210 | *external = internal; |
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211 | else |
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212 | *external = _Addresses_Add_offset( the_port->external_base, |
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213 | ending ); |
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214 | _Thread_Enable_dispatch(); |
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215 | return( RTEMS_SUCCESSFUL ); |
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216 | } |
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217 | |
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218 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
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219 | } |
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220 | |
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221 | /*PAGE |
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222 | * |
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223 | * rtems_port_external_to_internal |
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224 | * |
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225 | * This directive converts an external dual-ported memory address to an |
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226 | * internal dual-ported memory address. If the given external address |
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227 | * is an invalid dual-ported address, then the internal address is set |
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228 | * to the given external address. |
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229 | * |
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230 | * Input parameters: |
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231 | * id - id of dp memory object |
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232 | * external - external address |
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233 | * internal - pointer of internal address to set |
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234 | * |
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235 | * Output parameters: |
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236 | * internal - internal address |
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237 | * RTEMS_SUCCESSFUL - always succeeds |
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238 | */ |
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239 | |
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240 | rtems_status_code rtems_port_external_to_internal( |
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241 | Objects_Id id, |
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242 | void *external, |
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243 | void **internal |
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244 | ) |
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245 | { |
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246 | register Dual_ported_memory_Control *the_port; |
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247 | Objects_Locations location; |
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248 | unsigned32 ending; |
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249 | |
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250 | the_port = _Dual_ported_memory_Get( id, &location ); |
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251 | switch ( location ) { |
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252 | case OBJECTS_ERROR: |
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253 | return( RTEMS_INVALID_ID ); |
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254 | case OBJECTS_REMOTE: /* this error cannot be returned */ |
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255 | return( RTEMS_INTERNAL_ERROR ); |
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256 | case OBJECTS_LOCAL: |
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257 | ending = _Addresses_Subtract( external, the_port->external_base ); |
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258 | if ( ending > the_port->length ) |
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259 | *internal = external; |
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260 | else |
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261 | *internal = _Addresses_Add_offset( the_port->internal_base, |
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262 | ending ); |
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263 | _Thread_Enable_dispatch(); |
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264 | return( RTEMS_SUCCESSFUL ); |
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265 | } |
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266 | |
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267 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
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268 | } |
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