1 | /* |
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2 | * This file contains the i386ex console IO package. |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1997. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * Copyright assigned to U.S. Government, 1994. |
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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.OARcorp.com/rtems/license.html. |
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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 | #define F386_INIT |
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16 | |
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17 | #include <bsp.h> |
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18 | #include <rtems/libio.h> |
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19 | |
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20 | #include <stdlib.h> |
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21 | |
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22 | #include "../startup/80386ex.h" |
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23 | |
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24 | /* console_cleanup |
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25 | * |
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26 | * This routine is called at exit to clean up the console hardware. |
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27 | * |
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28 | * Input parameters: NONE |
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29 | * |
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30 | * Output parameters: NONE |
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31 | * |
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32 | * Return values: |
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33 | */ |
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34 | |
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35 | void console_cleanup( void ) |
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36 | { |
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37 | register rtems_unsigned8 ignored; |
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38 | |
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39 | /* clear the read buffer */ |
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40 | |
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41 | inport_byte( RBR0, ignored ); |
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42 | |
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43 | } |
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44 | |
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45 | /* console_initialize |
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46 | * |
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47 | * This routine initializes the console IO driver. |
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48 | * |
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49 | * Input parameters: NONE |
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50 | * |
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51 | * Output parameters: NONE |
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52 | * |
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53 | * Return values: |
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54 | */ |
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55 | |
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56 | rtems_device_driver console_initialize( |
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57 | rtems_device_major_number major, |
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58 | rtems_device_minor_number minor, |
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59 | void *arg |
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60 | ) |
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61 | { |
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62 | rtems_status_code status; |
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63 | |
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64 | /* |
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65 | * flush the console now and at exit. Just in case. |
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66 | */ |
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67 | |
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68 | console_cleanup(); |
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69 | |
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70 | status = rtems_io_register_name( |
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71 | "/dev/console", |
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72 | major, |
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73 | (rtems_device_minor_number) 0 |
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74 | ); |
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75 | |
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76 | if (status != RTEMS_SUCCESSFUL) |
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77 | rtems_fatal_error_occurred(status); |
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78 | |
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79 | atexit( console_cleanup ); |
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80 | |
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81 | return RTEMS_SUCCESSFUL; |
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82 | } |
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83 | |
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84 | |
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85 | /* is_character_ready |
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86 | * |
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87 | * This routine returns TRUE if a character is available. |
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88 | * |
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89 | * Input parameters: NONE |
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90 | * |
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91 | * Output parameters: NONE |
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92 | * |
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93 | * Return values: |
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94 | */ |
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95 | |
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96 | rtems_boolean is_character_ready( |
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97 | char *ch |
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98 | ) |
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99 | { |
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100 | register rtems_unsigned8 status; |
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101 | |
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102 | inport_byte( LSR1, status ); |
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103 | |
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104 | if ( Is_rx_ready( status ) ) { |
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105 | inport_byte( RBR1, status ); |
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106 | *ch = status; |
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107 | return TRUE; |
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108 | } |
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109 | return FALSE; |
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110 | } |
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111 | |
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112 | /* inbyte |
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113 | * |
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114 | * This routine reads a character from the UART. |
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115 | * |
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116 | * Input parameters: NONE |
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117 | * |
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118 | * Output parameters: NONE |
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119 | * |
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120 | * Return values: |
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121 | * character read from UART |
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122 | */ |
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123 | |
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124 | char inbyte( void ) |
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125 | { |
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126 | register rtems_unsigned8 status; |
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127 | char ch; |
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128 | |
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129 | do { |
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130 | inport_byte( LSR1, status ); |
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131 | } while ( !( status & 0x01 ));/* s/b while ( !( Is_rx_ready( status ) ) ); */ |
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132 | |
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133 | inport_byte( RBR1, ch ); |
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134 | |
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135 | return ch; |
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136 | } |
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137 | |
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138 | /* outbyte |
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139 | * |
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140 | * This routine transmits a character out the port. It supports |
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141 | * XON/XOFF flow control. |
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142 | * |
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143 | * Input parameters: |
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144 | * ch - character to be transmitted |
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145 | * |
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146 | * Output parameters: NONE |
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147 | */ |
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148 | |
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149 | void outbyte( |
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150 | char ch |
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151 | ) |
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152 | { |
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153 | rtems_unsigned8 status; |
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154 | |
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155 | do { |
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156 | inport_byte( LSR1, status ); |
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157 | } while ( ! ( 0x40 & status ) ); /* ( Is_tx_ready( status ) ) );*/ |
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158 | |
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159 | /* |
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160 | * GDB will NOT use XON/XOFF protocol |
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161 | */ |
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162 | |
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163 | |
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164 | #ifdef USE_XON |
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165 | |
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166 | while ( is_character_ready( &status ) == TRUE ) { |
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167 | if ( status == XOFF ) |
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168 | do { |
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169 | while ( is_character_ready( &status ) == FALSE ) ; |
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170 | } while ( status != XON ); |
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171 | } |
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172 | |
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173 | #endif |
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174 | |
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175 | outport_byte( TBR1, ch ); |
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176 | |
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177 | } |
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178 | |
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179 | /* |
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180 | * Open entry point |
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181 | */ |
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182 | |
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183 | rtems_device_driver console_open( |
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184 | rtems_device_major_number major, |
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185 | rtems_device_minor_number minor, |
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186 | void * arg |
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187 | ) |
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188 | { |
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189 | return RTEMS_SUCCESSFUL; |
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190 | } |
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191 | |
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192 | /* |
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193 | * Close entry point |
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194 | */ |
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195 | |
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196 | rtems_device_driver console_close( |
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197 | rtems_device_major_number major, |
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198 | rtems_device_minor_number minor, |
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199 | void * arg |
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200 | ) |
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201 | { |
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202 | return RTEMS_SUCCESSFUL; |
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203 | } |
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204 | |
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205 | /* |
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206 | * read bytes from the serial port. We only have stdin. |
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207 | */ |
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208 | |
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209 | rtems_device_driver console_read( |
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210 | rtems_device_major_number major, |
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211 | rtems_device_minor_number minor, |
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212 | void * arg |
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213 | ) |
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214 | { |
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215 | rtems_libio_rw_args_t *rw_args; |
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216 | char *buffer; |
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217 | int maximum; |
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218 | int count = 0; |
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219 | |
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220 | rw_args = (rtems_libio_rw_args_t *) arg; |
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221 | |
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222 | buffer = rw_args->buffer; |
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223 | maximum = rw_args->count; |
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224 | |
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225 | for (count = 0; count < maximum; count++) { |
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226 | buffer[ count ] = inbyte(); |
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227 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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228 | buffer[ count++ ] = '\n'; |
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229 | break; |
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230 | } |
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231 | } |
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232 | |
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233 | rw_args->bytes_moved = count; |
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234 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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235 | } |
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236 | |
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237 | /* |
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238 | * write bytes to the serial port. Stdout and stderr are the same. |
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239 | */ |
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240 | |
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241 | rtems_device_driver console_write( |
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242 | rtems_device_major_number major, |
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243 | rtems_device_minor_number minor, |
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244 | void * arg |
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245 | ) |
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246 | { |
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247 | int count; |
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248 | int maximum; |
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249 | rtems_libio_rw_args_t *rw_args; |
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250 | char *buffer; |
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251 | |
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252 | rw_args = (rtems_libio_rw_args_t *) arg; |
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253 | |
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254 | buffer = rw_args->buffer; |
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255 | maximum = rw_args->count; |
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256 | |
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257 | for (count = 0; count < maximum; count++) { |
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258 | if ( buffer[ count ] == '\n') { |
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259 | outbyte('\r'); |
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260 | } |
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261 | outbyte( buffer[ count ] ); |
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262 | } |
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263 | |
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264 | rw_args->bytes_moved = maximum; |
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265 | return 0; |
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266 | } |
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267 | |
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268 | /* |
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269 | * IO Control entry point |
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270 | */ |
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271 | |
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272 | rtems_device_driver console_control( |
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273 | rtems_device_major_number major, |
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274 | rtems_device_minor_number minor, |
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275 | void * arg |
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276 | ) |
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277 | { |
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278 | return RTEMS_SUCCESSFUL; |
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279 | } |
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