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) 1989-1999. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.rtems.com/license/LICENSE. |
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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 | #if HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <rtems/system.h> |
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20 | #include <rtems/io.h> |
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21 | #include <rtems/score/isr.h> |
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22 | #include <rtems/score/thread.h> |
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23 | #include <rtems/score/wkspace.h> |
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24 | |
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25 | #include <string.h> |
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26 | |
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27 | /*PAGE |
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28 | * |
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29 | * _IO_Manager_initialization |
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30 | * |
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31 | * The IO manager has been extended to support runtime driver |
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32 | * registration. The driver table is now allocated in the |
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33 | * workspace. |
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34 | * |
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35 | */ |
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36 | |
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37 | void _IO_Manager_initialization( |
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38 | rtems_driver_address_table *driver_table, |
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39 | uint32_t drivers_in_table, |
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40 | uint32_t number_of_drivers, |
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41 | uint32_t number_of_devices |
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42 | ) |
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43 | { |
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44 | void *tmp; |
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45 | uint32_t index; |
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46 | rtems_driver_name_t *np; |
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47 | |
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48 | if ( number_of_drivers < drivers_in_table ) |
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49 | number_of_drivers = drivers_in_table; |
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50 | |
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51 | tmp = _Workspace_Allocate_or_fatal_error( |
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52 | sizeof( rtems_driver_address_table ) * ( number_of_drivers ) |
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53 | ); |
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54 | |
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55 | _IO_Driver_address_table = (rtems_driver_address_table *) tmp; |
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56 | |
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57 | memset( |
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58 | _IO_Driver_address_table, 0, |
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59 | sizeof( rtems_driver_address_table ) * ( number_of_drivers ) |
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60 | ); |
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61 | |
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62 | if ( drivers_in_table ) |
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63 | for ( index = 0 ; index < drivers_in_table ; index++ ) |
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64 | _IO_Driver_address_table[index] = driver_table[index]; |
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65 | |
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66 | _IO_Number_of_drivers = number_of_drivers; |
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67 | _IO_Number_of_devices = number_of_devices; |
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68 | |
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69 | tmp = _Workspace_Allocate_or_fatal_error( |
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70 | sizeof( rtems_driver_name_t ) * ( number_of_devices + 1 ) |
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71 | ); |
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72 | |
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73 | _IO_Driver_name_table = (rtems_driver_name_t *) tmp; |
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74 | |
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75 | for( index=0, np = _IO_Driver_name_table ; |
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76 | index < _IO_Number_of_devices ; |
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77 | index++, np++ ) { |
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78 | np->device_name = 0; |
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79 | np->device_name_length = 0; |
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80 | np->major = 0; |
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81 | np->minor = 0; |
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82 | } |
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83 | } |
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84 | |
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85 | /*PAGE |
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86 | * |
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87 | * _IO_Initialize_all_drivers |
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88 | * |
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89 | * This routine initializes all device drivers |
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90 | * |
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91 | * Input Paramters: NONE |
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92 | * |
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93 | * Output Parameters: NONE |
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94 | */ |
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95 | |
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96 | void _IO_Initialize_all_drivers( void ) |
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97 | { |
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98 | rtems_device_major_number major; |
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99 | |
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100 | for ( major=0 ; major < _IO_Number_of_drivers ; major ++ ) |
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101 | (void) rtems_io_initialize( major, 0, NULL); |
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102 | } |
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103 | |
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104 | /*PAGE |
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105 | * |
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106 | * rtems_io_register_driver |
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107 | * |
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108 | * Register a driver into the device driver table. |
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109 | * |
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110 | * Input Paramters: |
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111 | * major - device major number (0 means allocate |
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112 | * a number) |
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113 | * driver_table - driver callout function table |
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114 | * registered_major - the major number which is registered |
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115 | * |
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116 | * Output Parameters: |
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117 | * RTEMS_SUCCESSFUL - if successful |
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118 | * error code - if unsuccessful |
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119 | */ |
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120 | |
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121 | rtems_status_code rtems_io_register_driver( |
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122 | rtems_device_major_number major, |
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123 | rtems_driver_address_table *driver_table, |
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124 | rtems_device_major_number *registered_major |
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125 | ) |
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126 | { |
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127 | *registered_major = 0; |
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128 | |
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129 | /* |
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130 | * Test for initialise/open being present to indicate the driver slot is |
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131 | * in use. |
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132 | */ |
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133 | |
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134 | if ( major >= _IO_Number_of_drivers ) |
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135 | return RTEMS_INVALID_NUMBER; |
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136 | |
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137 | if ( major == 0 ) |
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138 | { |
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139 | for ( major = _IO_Number_of_drivers - 1 ; major ; major-- ) |
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140 | if ( _IO_Driver_address_table[major].initialization_entry == 0 && |
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141 | _IO_Driver_address_table[major].open_entry == 0 ) |
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142 | break; |
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143 | |
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144 | if (( major == 0 ) && |
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145 | ( _IO_Driver_address_table[major].initialization_entry == 0 && |
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146 | _IO_Driver_address_table[major].open_entry == 0 )) |
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147 | return RTEMS_TOO_MANY; |
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148 | } |
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149 | |
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150 | if ( _IO_Driver_address_table[major].initialization_entry == 0 && |
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151 | _IO_Driver_address_table[major].open_entry == 0 ) |
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152 | { |
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153 | _IO_Driver_address_table[major] = *driver_table; |
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154 | *registered_major = major; |
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155 | |
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156 | rtems_io_initialize( major, 0, NULL ); |
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157 | |
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158 | return RTEMS_SUCCESSFUL; |
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159 | } |
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160 | |
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161 | return RTEMS_RESOURCE_IN_USE; |
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162 | } |
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163 | |
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164 | /*PAGE |
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165 | * |
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166 | * rtems_io_unregister_driver |
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167 | * |
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168 | * Unregister a driver from the device driver table. |
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169 | * |
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170 | * Input Paramters: |
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171 | * major - device major number |
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172 | * |
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173 | * Output Parameters: |
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174 | * RTEMS_SUCCESSFUL - if successful |
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175 | * error code - if unsuccessful |
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176 | */ |
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177 | |
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178 | rtems_status_code rtems_io_unregister_driver( |
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179 | rtems_device_major_number major |
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180 | ) |
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181 | { |
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182 | if ( major < _IO_Number_of_drivers ) |
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183 | { |
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184 | memset( |
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185 | &_IO_Driver_address_table[major], |
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186 | 0, |
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187 | sizeof( rtems_driver_address_table ) |
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188 | ); |
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189 | return RTEMS_SUCCESSFUL; |
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190 | } |
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191 | return RTEMS_UNSATISFIED; |
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192 | } |
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193 | |
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194 | /*PAGE |
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195 | * |
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196 | * rtems_io_register_name |
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197 | * |
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198 | * Associate a name with a driver |
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199 | * |
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200 | * Input Paramters: |
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201 | * device_name - pointer to name string to associate with device |
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202 | * major - device major number to receive name |
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203 | * minor - device minor number to receive name |
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204 | * |
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205 | * Output Parameters: |
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206 | * RTEMS_SUCCESSFUL - if successful |
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207 | * error code - if unsuccessful |
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208 | */ |
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209 | |
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210 | #if 0 |
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211 | rtems_status_code rtems_io_register_name( |
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212 | char *device_name, |
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213 | rtems_device_major_number major, |
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214 | rtems_device_minor_number minor |
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215 | ) |
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216 | { |
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217 | rtems_driver_name_t *np; |
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218 | uint32_t level; |
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219 | uint32_t index; |
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220 | |
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221 | /* find an empty slot */ |
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222 | for( index=0, np = _IO_Driver_name_table ; |
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223 | index < _IO_Number_of_devices ; |
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224 | index++, np++ ) |
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225 | { |
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226 | |
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227 | _ISR_Disable(level); |
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228 | if (np->device_name == 0) |
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229 | { |
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230 | np->device_name = device_name; |
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231 | np->device_name_length = strlen(device_name); |
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232 | np->major = major; |
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233 | np->minor = minor; |
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234 | _ISR_Enable(level); |
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235 | |
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236 | return RTEMS_SUCCESSFUL; |
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237 | } |
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238 | _ISR_Enable(level); |
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239 | } |
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240 | |
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241 | return RTEMS_TOO_MANY; |
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242 | } |
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243 | #endif |
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244 | |
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245 | /*PAGE |
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246 | * |
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247 | * rtems_io_initialize |
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248 | * |
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249 | * This routine is the initialization directive of the IO manager. |
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250 | * |
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251 | * Input Paramters: |
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252 | * major - device driver number |
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253 | * minor - device number |
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254 | * argument - pointer to argument(s) |
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255 | * |
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256 | * Output Parameters: |
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257 | * returns - return code |
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258 | */ |
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259 | |
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260 | rtems_status_code rtems_io_initialize( |
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261 | rtems_device_major_number major, |
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262 | rtems_device_minor_number minor, |
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263 | void *argument |
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264 | ) |
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265 | { |
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266 | rtems_device_driver_entry callout; |
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267 | |
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268 | if ( major >= _IO_Number_of_drivers ) |
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269 | return RTEMS_INVALID_NUMBER; |
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270 | |
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271 | callout = _IO_Driver_address_table[major].initialization_entry; |
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272 | return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; |
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273 | } |
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274 | |
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275 | /*PAGE |
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276 | * |
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277 | * rtems_io_open |
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278 | * |
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279 | * This routine is the open directive of the IO manager. |
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280 | * |
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281 | * Input Paramters: |
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282 | * major - device driver number |
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283 | * minor - device number |
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284 | * argument - pointer to argument(s) |
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285 | * |
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286 | * Output Parameters: |
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287 | * returns - return code |
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288 | */ |
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289 | |
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290 | rtems_status_code rtems_io_open( |
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291 | rtems_device_major_number major, |
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292 | rtems_device_minor_number minor, |
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293 | void *argument |
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294 | ) |
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295 | { |
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296 | rtems_device_driver_entry callout; |
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297 | |
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298 | if ( major >= _IO_Number_of_drivers ) |
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299 | return RTEMS_INVALID_NUMBER; |
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300 | |
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301 | callout = _IO_Driver_address_table[major].open_entry; |
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302 | return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; |
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303 | } |
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304 | |
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305 | /*PAGE |
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306 | * |
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307 | * rtems_io_close |
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308 | * |
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309 | * This routine is the close directive of the IO manager. |
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310 | * |
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311 | * Input Paramters: |
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312 | * major - device driver number |
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313 | * minor - device number |
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314 | * argument - pointer to argument(s) |
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315 | * |
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316 | * Output Parameters: |
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317 | * returns - return code |
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318 | */ |
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319 | |
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320 | rtems_status_code rtems_io_close( |
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321 | rtems_device_major_number major, |
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322 | rtems_device_minor_number minor, |
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323 | void *argument |
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324 | ) |
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325 | { |
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326 | rtems_device_driver_entry callout; |
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327 | |
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328 | if ( major >= _IO_Number_of_drivers ) |
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329 | return RTEMS_INVALID_NUMBER; |
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330 | |
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331 | callout = _IO_Driver_address_table[major].close_entry; |
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332 | return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; |
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333 | } |
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334 | |
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335 | /*PAGE |
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336 | * |
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337 | * rtems_io_read |
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338 | * |
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339 | * This routine is the read directive of the IO manager. |
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340 | * |
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341 | * Input Paramters: |
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342 | * major - device driver number |
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343 | * minor - device number |
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344 | * argument - pointer to argument(s) |
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345 | * |
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346 | * Output Parameters: |
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347 | * returns - return code |
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348 | */ |
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349 | |
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350 | rtems_status_code rtems_io_read( |
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351 | rtems_device_major_number major, |
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352 | rtems_device_minor_number minor, |
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353 | void *argument |
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354 | ) |
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355 | { |
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356 | rtems_device_driver_entry callout; |
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357 | |
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358 | if ( major >= _IO_Number_of_drivers ) |
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359 | return RTEMS_INVALID_NUMBER; |
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360 | |
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361 | callout = _IO_Driver_address_table[major].read_entry; |
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362 | return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; |
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363 | } |
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364 | |
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365 | /*PAGE |
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366 | * |
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367 | * rtems_io_write |
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368 | * |
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369 | * This routine is the write directive of the IO manager. |
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370 | * |
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371 | * Input Paramters: |
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372 | * major - device driver number |
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373 | * minor - device number |
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374 | * argument - pointer to argument(s) |
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375 | * |
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376 | * Output Parameters: |
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377 | * returns - return code |
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378 | */ |
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379 | |
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380 | rtems_status_code rtems_io_write( |
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381 | rtems_device_major_number major, |
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382 | rtems_device_minor_number minor, |
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383 | void *argument |
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384 | ) |
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385 | { |
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386 | rtems_device_driver_entry callout; |
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387 | |
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388 | if ( major >= _IO_Number_of_drivers ) |
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389 | return RTEMS_INVALID_NUMBER; |
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390 | |
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391 | callout = _IO_Driver_address_table[major].write_entry; |
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392 | return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; |
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393 | } |
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394 | |
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395 | /*PAGE |
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396 | * |
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397 | * rtems_io_control |
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398 | * |
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399 | * This routine is the control directive of the IO manager. |
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400 | * |
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401 | * Input Paramters: |
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402 | * major - device driver number |
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403 | * minor - device number |
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404 | * argument - pointer to argument(s) |
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405 | * |
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406 | * Output Parameters: |
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407 | * returns - return code |
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408 | */ |
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409 | |
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410 | rtems_status_code rtems_io_control( |
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411 | rtems_device_major_number major, |
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412 | rtems_device_minor_number minor, |
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413 | void *argument |
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414 | ) |
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415 | { |
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416 | rtems_device_driver_entry callout; |
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417 | |
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418 | if ( major >= _IO_Number_of_drivers ) |
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419 | return RTEMS_INVALID_NUMBER; |
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420 | |
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421 | callout = _IO_Driver_address_table[major].control_entry; |
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422 | return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; |
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423 | } |
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