1 | /* irq.c |
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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) 2000 Canon Research France SA. |
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6 | * Emmanuel Raguet, mailto:raguet@crf.canon.fr |
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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 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 | |
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16 | #include <bsp.h> |
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17 | #include <irq.h> |
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18 | #include <registers.h> |
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19 | #include <rtems/score/thread.h> |
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20 | #include <rtems/score/apiext.h> |
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21 | |
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22 | |
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23 | /* |
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24 | * This function check that the value given for the irq line |
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25 | * is valid. |
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26 | */ |
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27 | |
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28 | static int isValidInterrupt(int irq) |
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29 | { |
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30 | if ( (irq < 0) || (irq > BSP_MAX_INT)) |
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31 | return 0; |
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32 | return 1; |
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33 | } |
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34 | |
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35 | /* |
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36 | * ------------------------ RTEMS Single Irq Handler Mngt Routines ---------------- |
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37 | */ |
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38 | |
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39 | int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq) |
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40 | { |
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41 | rtems_irq_hdl *HdlTable; |
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42 | rtems_interrupt_level level; |
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43 | |
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44 | if (!isValidInterrupt(irq->name)) { |
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45 | return 0; |
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46 | } |
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47 | /* |
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48 | * Check if default handler is actually connected. If not issue an error. |
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49 | */ |
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50 | HdlTable = VECTOR_TABLE; |
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51 | if (*(HdlTable + irq->name) != default_int_handler) { |
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52 | return 0; |
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53 | } |
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54 | |
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55 | _CPU_ISR_Disable(level); |
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56 | |
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57 | /* |
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58 | * store the new handler |
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59 | */ |
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60 | *(HdlTable + irq->name) = irq->hdl; |
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61 | |
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62 | /* |
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63 | * Here is the code to install an interrupt vector |
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64 | * for the BSP : unmask INT, .... |
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65 | * ........................ |
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66 | */ |
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67 | |
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68 | _CPU_ISR_Enable(level); |
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69 | |
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70 | return 1; |
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71 | } |
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72 | |
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73 | int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq) |
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74 | { |
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75 | rtems_irq_hdl *HdlTable; |
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76 | rtems_interrupt_level level; |
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77 | |
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78 | if (!isValidInterrupt(irq->name)) { |
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79 | return 0; |
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80 | } |
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81 | /* |
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82 | * Check if the handler is actually connected. If not issue an error. |
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83 | */ |
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84 | HdlTable = VECTOR_TABLE; |
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85 | if (*(HdlTable + irq->name) != irq->hdl) { |
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86 | return 0; |
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87 | } |
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88 | _CPU_ISR_Disable(level); |
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89 | |
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90 | /* |
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91 | * Here is the code to uninstall an interrupt vector |
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92 | * for the BSP : mask INT, .... |
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93 | * ........................ |
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94 | */ |
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95 | |
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96 | /* |
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97 | * restore the default irq value |
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98 | */ |
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99 | *(HdlTable + irq->name) = default_int_handler; |
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100 | |
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101 | _CPU_ISR_Enable(level); |
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102 | |
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103 | return 1; |
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104 | } |
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105 | |
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106 | |
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107 | |
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108 | void _ThreadProcessSignalsFromIrq (CPU_Exception_frame* ctx) |
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109 | { |
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110 | /* |
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111 | * Process pending signals that have not already been |
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112 | * processed by _Thread_Displatch. This happens quite |
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113 | * unfrequently : the ISR must have posted an action |
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114 | * to the current running thread. |
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115 | */ |
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116 | if ( _Thread_Do_post_task_switch_extension || |
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117 | _Thread_Executing->do_post_task_switch_extension ) { |
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118 | _Thread_Executing->do_post_task_switch_extension = FALSE; |
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119 | _API_extensions_Run_postswitch(); |
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120 | } |
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121 | } |
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