1 | /* |
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2 | * |
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3 | * This file contains the implementation of the function described in irq.h |
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4 | * |
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5 | * Copyright (C) 1998, 1999 valette@crf.canon.fr |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #include <stdlib.h> |
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15 | |
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16 | #include <bsp.h> |
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17 | #include <bsp/irq.h> |
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18 | #include <bsp/VME.h> |
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19 | #include <rtems/score/apiext.h> /* for post ISR signal processing */ |
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20 | #include <libcpu/raw_exception.h> |
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21 | #include <libcpu/io.h> |
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22 | #include <bsp/vectors.h> |
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23 | #include <stdlib.h> |
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24 | #include <rtems/bspIo.h> /* for printk */ |
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25 | |
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26 | /* |
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27 | * default handler connected on each irq after bsp initialization |
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28 | */ |
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29 | static rtems_irq_connect_data default_rtems_entry; |
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30 | |
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31 | /* |
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32 | * location used to store initial tables used for interrupt |
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33 | * management. |
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34 | */ |
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35 | static rtems_irq_global_settings* internal_config; |
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36 | static rtems_irq_connect_data* rtems_hdl_tbl; |
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37 | |
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38 | /* |
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39 | * Check if IRQ is an ISA IRQ |
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40 | */ |
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41 | static inline int is_isa_irq(const rtems_irq_number irqLine) |
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42 | { |
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43 | return (((int) irqLine <= BSP_ISA_IRQ_MAX_OFFSET) & |
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44 | ((int) irqLine >= BSP_ISA_IRQ_LOWEST_OFFSET) |
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45 | ); |
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46 | } |
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47 | |
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48 | /* |
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49 | * Check if IRQ is an pci IRQ |
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50 | */ |
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51 | static inline int is_pci_irq(const rtems_irq_number irqLine) |
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52 | { |
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53 | return (((int) irqLine <= BSP_PCI_IRQ_MAX_OFFSET) & |
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54 | ((int) irqLine >= BSP_PCI_IRQ_LOWEST_OFFSET) |
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55 | ); |
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56 | } |
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57 | |
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58 | /* |
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59 | * Check if IRQ is a Processor IRQ |
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60 | */ |
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61 | static inline int is_processor_irq(const rtems_irq_number irqLine) |
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62 | { |
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63 | return (((int) irqLine <= BSP_PROCESSOR_IRQ_MAX_OFFSET) & |
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64 | ((int) irqLine >= BSP_PROCESSOR_IRQ_LOWEST_OFFSET) |
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65 | ); |
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66 | } |
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67 | |
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68 | /* |
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69 | * ------------------------ RTEMS Irq helper functions ---------------- |
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70 | */ |
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71 | |
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72 | /* |
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73 | * This function check that the value given for the irq line |
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74 | * is valid. |
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75 | */ |
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76 | |
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77 | static int isValidInterrupt(int irq) |
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78 | { |
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79 | if ( (irq < BSP_LOWEST_OFFSET) || (irq > BSP_MAX_OFFSET)) |
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80 | return 0; |
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81 | return 1; |
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82 | } |
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83 | |
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84 | /* |
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85 | * ------------------------ RTEMS Shared Irq Handler Mngt Routines ---------------- |
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86 | */ |
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87 | int BSP_install_rtems_shared_irq_handler (const rtems_irq_connect_data* irq) |
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88 | { |
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89 | rtems_interrupt_level level; |
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90 | rtems_irq_connect_data* vchain; |
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91 | |
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92 | if (!isValidInterrupt(irq->name)) { |
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93 | printk("Invalid interrupt vector %d\n",irq->name); |
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94 | return 0; |
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95 | } |
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96 | |
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97 | rtems_interrupt_disable(level); |
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98 | |
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99 | if ( (int)rtems_hdl_tbl[irq->name].next_handler == -1 ) { |
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100 | rtems_interrupt_enable(level); |
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101 | printk("IRQ vector %d already connected to an unshared handler\n",irq->name); |
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102 | return 0; |
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103 | } |
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104 | |
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105 | vchain = (rtems_irq_connect_data*)malloc(sizeof(rtems_irq_connect_data)); |
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106 | |
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107 | /* save off topmost handler */ |
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108 | vchain[0]= rtems_hdl_tbl[irq->name]; |
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109 | |
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110 | /* |
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111 | * store the data provided by user |
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112 | */ |
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113 | rtems_hdl_tbl[irq->name] = *irq; |
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114 | |
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115 | /* link chain to new topmost handler */ |
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116 | rtems_hdl_tbl[irq->name].next_handler = (void *)vchain; |
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117 | |
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118 | /* |
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119 | * XXX FIX ME |
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120 | */ |
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121 | if (is_pci_irq(irq->name)) { |
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122 | } |
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123 | |
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124 | if (is_processor_irq(irq->name)) { |
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125 | /* |
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126 | * Enable exception at processor level |
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127 | */ |
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128 | } |
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129 | /* |
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130 | * Enable interrupt on device |
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131 | */ |
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132 | irq->on(irq); |
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133 | |
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134 | rtems_interrupt_enable(level); |
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135 | |
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136 | return 1; |
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137 | } |
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138 | |
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139 | /* |
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140 | * ------------------------ RTEMS Single Irq Handler Mngt Routines ---------------- |
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141 | */ |
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142 | |
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143 | int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq) |
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144 | { |
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145 | rtems_interrupt_level level; |
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146 | |
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147 | if (!isValidInterrupt(irq->name)) { |
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148 | printk("Invalid interrupt vector %d\n",irq->name); |
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149 | return 0; |
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150 | } |
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151 | /* |
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152 | * Check if default handler is actually connected. If not issue an error. |
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153 | * You must first get the current handler via i386_get_current_idt_entry |
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154 | * and then disconnect it using i386_delete_idt_entry. |
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155 | * RATIONALE : to always have the same transition by forcing the user |
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156 | * to get the previous handler before accepting to disconnect. |
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157 | */ |
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158 | rtems_interrupt_disable(level); |
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159 | if (rtems_hdl_tbl[irq->name].hdl != default_rtems_entry.hdl) { |
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160 | rtems_interrupt_enable(level); |
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161 | printk("IRQ vector %d already connected\n",irq->name); |
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162 | return 0; |
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163 | } |
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164 | |
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165 | /* |
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166 | * store the data provided by user |
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167 | */ |
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168 | rtems_hdl_tbl[irq->name] = *irq; |
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169 | rtems_hdl_tbl[irq->name].next_handler = (void *)-1; |
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170 | |
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171 | /* XXX -FIX ME !! */ |
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172 | if (is_pci_irq(irq->name)) { |
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173 | /* |
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174 | * Enable interrupt |
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175 | */ |
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176 | } |
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177 | |
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178 | if (is_processor_irq(irq->name)) { |
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179 | /* |
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180 | * Enable exception at processor level |
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181 | */ |
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182 | } |
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183 | /* |
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184 | * Enable interrupt on device |
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185 | */ |
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186 | irq->on(irq); |
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187 | |
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188 | rtems_interrupt_enable(level); |
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189 | |
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190 | return 1; |
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191 | } |
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192 | |
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193 | int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* irq) |
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194 | { |
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195 | rtems_interrupt_level level; |
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196 | |
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197 | if (!isValidInterrupt(irq->name)) { |
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198 | return 0; |
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199 | } |
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200 | rtems_interrupt_disable(level); |
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201 | *irq = rtems_hdl_tbl[irq->name]; |
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202 | rtems_interrupt_enable(level); |
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203 | return 1; |
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204 | } |
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205 | |
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206 | int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq) |
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207 | { |
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208 | rtems_irq_connect_data *pchain= NULL, *vchain = NULL; |
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209 | rtems_interrupt_level level; |
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210 | |
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211 | if (!isValidInterrupt(irq->name)) { |
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212 | return 0; |
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213 | } |
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214 | /* |
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215 | * Check if default handler is actually connected. If not issue an error. |
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216 | * You must first get the current handler via i386_get_current_idt_entry |
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217 | * and then disconnect it using i386_delete_idt_entry. |
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218 | * RATIONALE : to always have the same transition by forcing the user |
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219 | * to get the previous handler before accepting to disconnect. |
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220 | */ |
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221 | rtems_interrupt_disable(level); |
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222 | if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) { |
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223 | rtems_interrupt_enable(level); |
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224 | return 0; |
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225 | } |
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226 | |
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227 | if( (int)rtems_hdl_tbl[irq->name].next_handler != -1 ) |
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228 | { |
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229 | int found = 0; |
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230 | |
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231 | for( (pchain= NULL, vchain = &rtems_hdl_tbl[irq->name]); |
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232 | (vchain->hdl != default_rtems_entry.hdl); |
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233 | (pchain= vchain, vchain = (rtems_irq_connect_data*)vchain->next_handler) ) |
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234 | { |
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235 | if( vchain->hdl == irq->hdl ) |
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236 | { |
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237 | found= -1; break; |
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238 | } |
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239 | } |
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240 | |
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241 | if( !found ) |
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242 | { |
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243 | rtems_interrupt_enable(level); |
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244 | return 0; |
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245 | } |
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246 | } |
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247 | else |
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248 | { |
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249 | if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) |
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250 | { |
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251 | rtems_interrupt_enable(level); |
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252 | return 0; |
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253 | } |
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254 | } |
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255 | |
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256 | /* XXX - FIX ME !! */ |
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257 | if (is_pci_irq(irq->name)) { |
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258 | /* |
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259 | * disable interrupt |
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260 | */ |
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261 | } |
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262 | if (is_processor_irq(irq->name)) { |
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263 | /* |
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264 | * disable exception at processor level |
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265 | */ |
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266 | } |
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267 | |
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268 | /* |
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269 | * Disable interrupt on device |
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270 | */ |
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271 | irq->off(irq); |
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272 | |
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273 | /* |
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274 | * restore the default irq value |
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275 | */ |
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276 | if( !vchain ) |
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277 | { |
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278 | /* single handler vector... */ |
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279 | rtems_hdl_tbl[irq->name] = default_rtems_entry; |
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280 | } |
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281 | else |
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282 | { |
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283 | if( pchain ) |
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284 | { |
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285 | /* non-first handler being removed */ |
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286 | pchain->next_handler = vchain->next_handler; |
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287 | } |
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288 | else |
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289 | { |
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290 | /* first handler isn't malloc'ed, so just overwrite it. Since |
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291 | the contents of vchain are being struct copied, vchain itself |
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292 | goes away */ |
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293 | rtems_hdl_tbl[irq->name]= *vchain; |
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294 | } |
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295 | free(vchain); |
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296 | } |
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297 | |
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298 | rtems_interrupt_enable(level); |
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299 | |
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300 | return 1; |
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301 | } |
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302 | |
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303 | /* |
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304 | * RTEMS Global Interrupt Handler Management Routines |
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305 | */ |
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306 | |
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307 | int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config) |
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308 | { |
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309 | int i; |
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310 | rtems_interrupt_level level; |
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311 | |
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312 | /* |
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313 | * Store various code accelerators |
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314 | */ |
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315 | internal_config = config; |
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316 | default_rtems_entry = config->defaultEntry; |
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317 | rtems_hdl_tbl = config->irqHdlTbl; |
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318 | |
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319 | rtems_interrupt_disable(level); |
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320 | /* |
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321 | * set up internal tables used by rtems interrupt prologue |
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322 | */ |
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323 | |
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324 | /* |
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325 | * XXX - FIX ME !!! |
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326 | */ |
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327 | for (i=BSP_PCI_IRQ_LOWEST_OFFSET; i < BSP_PCI_IRQ_LOWEST_OFFSET + BSP_PCI_IRQ_NUMBER ; i++) { |
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328 | if (rtems_hdl_tbl[i].hdl != default_rtems_entry.hdl) { |
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329 | { |
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330 | rtems_irq_connect_data* vchain; |
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331 | for( vchain = &rtems_hdl_tbl[i]; |
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332 | ((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl); |
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333 | vchain = (rtems_irq_connect_data*)vchain->next_handler ) |
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334 | { |
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335 | vchain->on(vchain); |
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336 | } |
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337 | } |
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338 | |
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339 | } |
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340 | else { |
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341 | /* rtems_hdl_tbl[i].off(&rtems_hdl_tbl[i]); */ |
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342 | { |
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343 | rtems_irq_connect_data* vchain; |
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344 | for( vchain = &rtems_hdl_tbl[i]; |
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345 | ((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl); |
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346 | vchain = (rtems_irq_connect_data*)vchain->next_handler ) |
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347 | { |
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348 | vchain->off(vchain); |
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349 | } |
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350 | } |
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351 | } |
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352 | } |
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353 | /* |
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354 | * finish with Processor exceptions handled like IRQ |
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355 | */ |
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356 | for (i=BSP_PROCESSOR_IRQ_LOWEST_OFFSET; i < BSP_PROCESSOR_IRQ_LOWEST_OFFSET+BSP_PROCESSOR_IRQ_NUMBER; i++){ |
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357 | if (rtems_hdl_tbl[i].hdl != default_rtems_entry.hdl) { |
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358 | { |
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359 | rtems_irq_connect_data* vchain; |
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360 | for( vchain = &rtems_hdl_tbl[i]; |
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361 | ((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl); |
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362 | vchain = (rtems_irq_connect_data*)vchain->next_handler ) |
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363 | { |
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364 | vchain->on(vchain); |
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365 | } |
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366 | } |
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367 | |
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368 | } |
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369 | else { |
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370 | { |
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371 | rtems_irq_connect_data* vchain; |
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372 | for( vchain = &rtems_hdl_tbl[i]; |
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373 | ((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl); |
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374 | vchain = (rtems_irq_connect_data*)vchain->next_handler ) |
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375 | { |
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376 | vchain->off(vchain); |
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377 | } |
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378 | } |
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379 | |
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380 | } |
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381 | } |
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382 | rtems_interrupt_enable(level); |
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383 | return 1; |
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384 | } |
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385 | |
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386 | int BSP_rtems_irq_mngt_get(rtems_irq_global_settings** config) |
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387 | { |
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388 | *config = internal_config; |
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389 | return 0; |
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390 | } |
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391 | |
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392 | unsigned BSP_spuriousIntr = 0; |
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393 | /* |
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394 | * High level IRQ handler called from shared_raw_irq_code_entry |
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395 | */ |
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396 | void C_dispatch_irq_handler (CPU_Interrupt_frame *frame, unsigned int excNum) |
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397 | { |
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398 | register unsigned int irq; |
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399 | register unsigned msr; |
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400 | register unsigned new_msr; |
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401 | |
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402 | if (excNum == ASM_DEC_VECTOR) { |
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403 | _CPU_MSR_GET(msr); |
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404 | new_msr = msr | MSR_EE; |
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405 | _CPU_MSR_SET(new_msr); |
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406 | |
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407 | rtems_hdl_tbl[BSP_DECREMENTER].hdl(rtems_hdl_tbl[BSP_DECREMENTER].handle); |
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408 | |
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409 | _CPU_MSR_SET(msr); |
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410 | return; |
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411 | |
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412 | } |
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413 | irq = read_and_clear_irq(); |
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414 | _CPU_MSR_GET(msr); |
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415 | new_msr = msr | MSR_EE; |
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416 | _CPU_MSR_SET(new_msr); |
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417 | |
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418 | /* rtems_hdl_tbl[irq].hdl(rtems_hdl_tbl[irq].handle); */ |
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419 | { |
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420 | rtems_irq_connect_data* vchain; |
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421 | for( vchain = &rtems_hdl_tbl[irq]; |
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422 | ((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl); |
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423 | vchain = (rtems_irq_connect_data*)vchain->next_handler ) |
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424 | { |
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425 | vchain->hdl(vchain->handle); |
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426 | } |
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427 | } |
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428 | |
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429 | _CPU_MSR_SET(msr); |
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430 | |
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431 | } |
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432 | |
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433 | void _ThreadProcessSignalsFromIrq (BSP_Exception_frame* ctx) |
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434 | { |
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435 | /* |
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436 | * Process pending signals that have not already been |
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437 | * processed by _Thread_Displatch. This happens quite |
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438 | * unfrequently : the ISR must have posted an action |
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439 | * to the current running thread. |
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440 | */ |
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441 | if ( _Thread_Do_post_task_switch_extension || |
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442 | _Thread_Executing->do_post_task_switch_extension ) { |
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443 | _Thread_Executing->do_post_task_switch_extension = FALSE; |
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444 | _API_extensions_Run_postswitch(); |
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445 | } |
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446 | /* |
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447 | * I plan to process other thread related events here. |
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448 | * This will include DEBUG session requested from keyboard... |
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449 | */ |
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450 | } |
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