1 | /* |
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2 | * Cirrus EP7312 Intererrupt handler |
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3 | * |
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4 | * Copyright (c) 2002 by Jay Monkman <jtm@smoothsmoothie.com> |
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5 | * |
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6 | * Copyright (c) 2002 by Charlie Steader <charlies@poliac.com> |
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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 | * |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #ifndef __IRQ_H__ |
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18 | #define __IRQ_H__ |
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19 | |
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20 | #ifdef __cplusplus |
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21 | extern "C" { |
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22 | #endif |
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23 | |
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24 | /* define that can be useful (the values are just examples) */ |
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25 | #define VECTOR_TABLE 0x40 |
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26 | |
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27 | #ifndef __asm__ |
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28 | |
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29 | /* |
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30 | * Include some preprocessor value also used by assember code |
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31 | */ |
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32 | |
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33 | #include <rtems.h> |
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34 | |
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35 | extern void default_int_handler(); |
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36 | /*-------------------------------------------------------------------------+ |
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37 | | Constants |
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38 | +--------------------------------------------------------------------------*/ |
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39 | |
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40 | /* enum of the possible interrupt sources */ |
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41 | typedef enum { |
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42 | /* int interrupt status/mask register 1 */ |
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43 | BSP_EXTFIQ = 0, |
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44 | BSP_BLINT, |
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45 | BSP_WEINT, |
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46 | BSP_MCINT, |
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47 | BSP_CSINT, |
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48 | BSP_EINT1, |
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49 | BSP_EINT2, |
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50 | BSP_EINT3, |
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51 | BSP_TC1OI, |
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52 | BSP_TC2OI, |
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53 | BSP_RTCMI, |
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54 | BSP_TINT, |
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55 | BSP_UTXINT1, |
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56 | BSP_URXINT1, |
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57 | BSP_UMSINT, |
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58 | BSP_SSEOTI, |
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59 | /* int interrupt status/mask register 2 */ |
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60 | BSP_KBDINT, |
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61 | BSP_SS2RX, |
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62 | BSP_SS2TX, |
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63 | BSP_UTXINT2, |
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64 | BSP_URXINT2, |
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65 | /* int interrupt status/mask register 3 */ |
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66 | BSP_DAIINT, |
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67 | BSP_MAX_INT, |
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68 | } rtems_irq_symbolic_name; |
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69 | |
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70 | |
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71 | |
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72 | /* |
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73 | * Type definition for RTEMS managed interrupts |
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74 | */ |
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75 | typedef unsigned char rtems_irq_level; |
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76 | typedef unsigned char rtems_irq_trigger; |
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77 | |
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78 | struct __rtems_irq_connect_data__; /* forward declaratiuon */ |
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79 | |
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80 | typedef void (*rtems_irq_hdl) (void); |
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81 | typedef void (*rtems_irq_enable) (const struct __rtems_irq_connect_data__*); |
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82 | typedef void (*rtems_irq_disable) (const struct __rtems_irq_connect_data__*); |
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83 | typedef int (*rtems_irq_is_enabled)(const struct __rtems_irq_connect_data__*); |
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84 | |
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85 | typedef struct __rtems_irq_connect_data__ { |
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86 | /* |
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87 | * IRQ line |
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88 | */ |
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89 | rtems_irq_symbolic_name name; |
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90 | /* |
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91 | * handler. See comment on handler properties below in function prototype. |
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92 | */ |
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93 | rtems_irq_hdl hdl; |
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94 | /* |
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95 | * function for enabling interrupts at device level (ONLY!). |
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96 | * The BSP code will automatically enable it at i8259s level. |
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97 | * RATIONALE : anyway such code has to exist in current driver code. |
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98 | * It is usually called immediately AFTER connecting the interrupt handler. |
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99 | * RTEMS may well need such a function when restoring normal interrupt |
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100 | * processing after a debug session. |
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101 | * |
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102 | */ |
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103 | rtems_irq_enable on; |
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104 | /* |
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105 | * function for disabling interrupts at device level (ONLY!). |
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106 | * The code will disable it at i8259s level. RATIONALE : anyway |
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107 | * such code has to exist for clean shutdown. It is usually called |
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108 | * BEFORE disconnecting the interrupt. RTEMS may well need such |
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109 | * a function when disabling normal interrupt processing for |
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110 | * a debug session. May well be a NOP function. |
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111 | */ |
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112 | rtems_irq_disable off; |
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113 | /* |
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114 | * function enabling to know what interrupt may currently occur |
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115 | * if someone manipulates the i8259s interrupt mask without care... |
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116 | */ |
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117 | rtems_irq_is_enabled isOn; |
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118 | /* |
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119 | * priority level at the vplus level |
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120 | */ |
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121 | rtems_irq_level irqLevel; |
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122 | /* |
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123 | * Trigger way : Rising or falling edge or High or low level |
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124 | */ |
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125 | rtems_irq_trigger irqTrigger; |
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126 | } rtems_irq_connect_data; |
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127 | |
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128 | /*-------------------------------------------------------------------------+ |
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129 | | Function Prototypes. |
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130 | +--------------------------------------------------------------------------*/ |
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131 | /* |
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132 | * ------------------- RTEMS Single Irq Handler Mngt Routines ---------------- |
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133 | */ |
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134 | |
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135 | /* |
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136 | * function to initialize the interrupt for a specific BSP |
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137 | */ |
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138 | void BSP_rtems_irq_mngt_init(); |
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139 | |
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140 | |
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141 | /* |
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142 | * function to connect a particular irq handler. This hanlder will NOT be called |
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143 | * directly as the result of the corresponding interrupt. Instead, a RTEMS |
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144 | * irq prologue will be called that will : |
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145 | * |
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146 | * 1) save the C scratch registers, |
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147 | * 2) switch to a interrupt stack if the interrupt is not nested, |
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148 | * 3) store the current i8259s' interrupt masks |
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149 | * 4) modify them to disable the current interrupt at 8259 level (and may |
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150 | * be others depending on software priorities) |
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151 | * 5) aknowledge the i8259s', |
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152 | * 6) demask the processor, |
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153 | * 7) call the application handler |
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154 | * |
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155 | * As a result the hdl function provided |
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156 | * |
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157 | * a) can perfectly be written is C, |
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158 | * b) may also well directly call the part of the RTEMS API that can be used |
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159 | * from interrupt level, |
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160 | * c) It only responsible for handling the jobs that need to be done at |
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161 | * the device level including (aknowledging/re-enabling the interrupt at device, |
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162 | * level, getting the data,...) |
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163 | * |
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164 | * When returning from the function, the following will be performed by |
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165 | * the RTEMS irq epilogue : |
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166 | * |
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167 | * 1) masks the interrupts again, |
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168 | * 2) restore the original i8259s' interrupt masks |
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169 | * 3) switch back on the orinal stack if needed, |
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170 | * 4) perform rescheduling when necessary, |
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171 | * 5) restore the C scratch registers... |
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172 | * 6) restore initial execution flow |
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173 | * |
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174 | */ |
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175 | |
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176 | int BSP_install_rtems_irq_handler (const rtems_irq_connect_data*); |
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177 | /* |
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178 | * function to get the current RTEMS irq handler for ptr->name. It enables to |
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179 | * define hanlder chain... |
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180 | */ |
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181 | int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* ptr); |
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182 | /* |
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183 | * function to get disconnect the RTEMS irq handler for ptr->name. |
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184 | * This function checks that the value given is the current one for safety reason. |
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185 | * The user can use the previous function to get it. |
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186 | */ |
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187 | int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data*); |
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188 | |
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189 | #endif /* __asm__ */ |
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190 | |
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191 | #ifdef __cplusplus |
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192 | } |
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193 | #endif |
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194 | |
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195 | #endif /* __IRQ_H__ */ |
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