1 | /* |
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2 | * Input/Output Manager |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * All rights assigned to U.S. Government, 1994. |
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8 | * |
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9 | * This material may be reproduced by or for the U.S. Government pursuant |
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10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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11 | * notice must appear in all copies of this file and its derivatives. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/config.h> |
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18 | #include <rtems/io.h> |
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19 | #include <rtems/isr.h> |
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20 | #include <rtems/thread.h> |
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21 | |
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22 | /*PAGE |
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23 | * |
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24 | * _IO_Initialize_all_drivers |
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25 | * |
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26 | * This routine initializes all device drivers |
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27 | * |
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28 | * Input Paramters: NONE |
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29 | * |
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30 | * Output Parameters: NONE |
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31 | */ |
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32 | |
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33 | void _IO_Initialize_all_drivers( void ) |
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34 | { |
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35 | rtems_device_major_number major; |
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36 | unsigned32 ignored; |
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37 | |
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38 | for ( major=0 ; major < _IO_Number_of_drivers ; major ++ ) |
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39 | (void) rtems_io_initialize( major, 0, _Configuration_Table, &ignored ); |
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40 | } |
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41 | |
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42 | /*PAGE |
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43 | * |
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44 | * rtems_io_initialize |
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45 | * |
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46 | * This routine is the initialization directive of the IO manager. |
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47 | * |
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48 | * Input Paramters: |
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49 | * major - device driver number |
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50 | * minor - device number |
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51 | * argument - pointer to argument(s) |
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52 | * return_value - pointer to driver's return value |
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53 | * |
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54 | * Output Parameters: |
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55 | * returns - return code |
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56 | * *return_value - driver's return code |
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57 | */ |
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58 | |
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59 | rtems_status_code rtems_io_initialize( |
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60 | rtems_device_major_number major, |
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61 | rtems_device_minor_number minor, |
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62 | void *argument, |
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63 | unsigned32 *return_value |
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64 | ) |
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65 | { |
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66 | return _IO_Handler_routine( |
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67 | IO_INITIALIZE_OPERATION, |
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68 | major, |
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69 | minor, |
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70 | argument, |
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71 | return_value |
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72 | ); |
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73 | } |
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74 | |
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75 | /*PAGE |
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76 | * |
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77 | * rtems_io_open |
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78 | * |
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79 | * This routine is the open directive of the IO manager. |
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80 | * |
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81 | * Input Paramters: |
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82 | * major - device driver number |
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83 | * minor - device number |
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84 | * argument - pointer to argument(s) |
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85 | * return_value - pointer to driver's return value |
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86 | * |
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87 | * Output Parameters: |
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88 | * returns - return code |
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89 | * *return_value - driver's return code |
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90 | */ |
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91 | |
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92 | rtems_status_code rtems_io_open( |
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93 | rtems_device_major_number major, |
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94 | rtems_device_minor_number minor, |
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95 | void *argument, |
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96 | unsigned32 *return_value |
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97 | ) |
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98 | { |
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99 | return _IO_Handler_routine( |
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100 | IO_OPEN_OPERATION, |
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101 | major, |
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102 | minor, |
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103 | argument, |
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104 | return_value |
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105 | ); |
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106 | } |
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107 | |
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108 | /*PAGE |
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109 | * |
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110 | * rtems_io_close |
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111 | * |
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112 | * This routine is the close directive of the IO manager. |
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113 | * |
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114 | * Input Paramters: |
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115 | * major - device driver number |
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116 | * minor - device number |
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117 | * argument - pointer to argument(s) |
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118 | * return_value - pointer to driver's return value |
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119 | * |
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120 | * Output Parameters: |
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121 | * returns - return code |
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122 | * *return_value - driver's return code |
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123 | */ |
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124 | |
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125 | rtems_status_code rtems_io_close( |
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126 | rtems_device_major_number major, |
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127 | rtems_device_minor_number minor, |
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128 | void *argument, |
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129 | unsigned32 *return_value |
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130 | ) |
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131 | { |
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132 | return _IO_Handler_routine( |
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133 | IO_CLOSE_OPERATION, |
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134 | major, |
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135 | minor, |
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136 | argument, |
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137 | return_value |
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138 | ); |
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139 | } |
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140 | |
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141 | /*PAGE |
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142 | * |
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143 | * rtems_io_read |
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144 | * |
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145 | * This routine is the read directive of the IO manager. |
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146 | * |
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147 | * Input Paramters: |
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148 | * major - device driver number |
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149 | * minor - device number |
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150 | * argument - pointer to argument(s) |
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151 | * return_value - pointer to driver's return value |
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152 | * |
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153 | * Output Parameters: |
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154 | * returns - return code |
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155 | * *return_value - driver's return code |
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156 | */ |
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157 | |
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158 | rtems_status_code rtems_io_read( |
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159 | rtems_device_major_number major, |
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160 | rtems_device_minor_number minor, |
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161 | void *argument, |
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162 | unsigned32 *return_value |
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163 | ) |
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164 | { |
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165 | return _IO_Handler_routine( |
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166 | IO_READ_OPERATION, |
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167 | major, |
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168 | minor, |
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169 | argument, |
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170 | return_value |
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171 | ); |
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172 | } |
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173 | |
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174 | /*PAGE |
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175 | * |
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176 | * rtems_io_write |
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177 | * |
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178 | * This routine is the write directive of the IO manager. |
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179 | * |
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180 | * Input Paramters: |
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181 | * major - device driver number |
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182 | * minor - device number |
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183 | * argument - pointer to argument(s) |
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184 | * return_value - pointer to driver's return value |
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185 | * |
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186 | * Output Parameters: |
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187 | * returns - return code |
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188 | * *return_value - driver's return code |
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189 | */ |
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190 | |
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191 | rtems_status_code rtems_io_write( |
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192 | rtems_device_major_number major, |
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193 | rtems_device_minor_number minor, |
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194 | void *argument, |
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195 | unsigned32 *return_value |
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196 | ) |
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197 | { |
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198 | return _IO_Handler_routine( |
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199 | IO_WRITE_OPERATION, |
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200 | major, |
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201 | minor, |
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202 | argument, |
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203 | return_value |
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204 | ); |
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205 | } |
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206 | |
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207 | /*PAGE |
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208 | * |
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209 | * rtems_io_control |
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210 | * |
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211 | * This routine is the control directive of the IO manager. |
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212 | * |
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213 | * Input Paramters: |
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214 | * major - device driver number |
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215 | * minor - device number |
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216 | * argument - pointer to argument(s) |
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217 | * return_value - pointer to driver's return value |
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218 | * |
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219 | * Output Parameters: |
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220 | * returns - return code |
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221 | * *return_value - driver's return code |
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222 | */ |
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223 | |
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224 | rtems_status_code rtems_io_control( |
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225 | rtems_device_major_number major, |
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226 | rtems_device_minor_number minor, |
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227 | void *argument, |
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228 | unsigned32 *return_value |
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229 | ) |
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230 | { |
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231 | return _IO_Handler_routine( |
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232 | IO_CONTROL_OPERATION, |
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233 | major, |
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234 | minor, |
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235 | argument, |
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236 | return_value |
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237 | ); |
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238 | } |
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239 | |
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240 | /*PAGE |
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241 | * |
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242 | * _IO_Handler_routine |
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243 | * |
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244 | * This routine implements all IO manager directives. |
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245 | * |
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246 | * Input Paramters: |
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247 | * operation - I/O operation to be performed |
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248 | * major - device driver number |
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249 | * minor - device number |
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250 | * argument - pointer to argument(s) |
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251 | * return_value - pointer to driver's return value |
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252 | * |
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253 | * Output Parameters: |
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254 | * returns - return code |
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255 | * *return_value - driver's return code |
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256 | */ |
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257 | |
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258 | rtems_status_code _IO_Handler_routine( |
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259 | IO_operations operation, |
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260 | rtems_device_major_number major, |
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261 | rtems_device_minor_number minor, |
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262 | void *argument, |
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263 | unsigned32 *return_value |
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264 | ) |
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265 | { |
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266 | rtems_device_driver_entry io_callout; |
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267 | |
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268 | /* |
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269 | * NOTE: There is no range checking as in Ada because: |
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270 | * + arrays in Ada are not always zero based. |
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271 | * + with zero based arrays, a comparison of an unsigned |
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272 | * number being less than zero would be necessary to |
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273 | * check it as a range. This would cause a warning for |
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274 | * checking an unsigned number for being negative. |
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275 | */ |
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276 | |
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277 | if ( major >= _IO_Number_of_drivers ) |
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278 | return ( RTEMS_INVALID_NUMBER ); |
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279 | |
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280 | switch ( operation ) { |
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281 | case IO_INITIALIZE_OPERATION: |
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282 | io_callout = _IO_Driver_address_table[ major ].initialization; |
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283 | break; |
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284 | case IO_OPEN_OPERATION: |
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285 | io_callout = _IO_Driver_address_table[ major ].open; |
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286 | break; |
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287 | case IO_CLOSE_OPERATION: |
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288 | io_callout = _IO_Driver_address_table[ major ].close; |
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289 | break; |
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290 | case IO_READ_OPERATION: |
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291 | io_callout = _IO_Driver_address_table[ major ].read; |
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292 | break; |
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293 | case IO_WRITE_OPERATION: |
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294 | io_callout = _IO_Driver_address_table[ major ].write; |
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295 | break; |
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296 | case IO_CONTROL_OPERATION: |
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297 | io_callout = _IO_Driver_address_table[ major ].control; |
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298 | break; |
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299 | default: /* unreached -- only to remove warnings */ |
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300 | io_callout = NULL; |
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301 | break; |
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302 | } |
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303 | |
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304 | if ( io_callout != NULL ) |
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305 | (*io_callout)( |
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306 | major, |
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307 | minor, |
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308 | argument, |
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309 | _Thread_Executing->Object.id, |
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310 | return_value |
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311 | ); |
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312 | else |
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313 | *return_value = 0; |
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314 | |
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315 | return( RTEMS_SUCCESSFUL ); |
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316 | } |
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