1 | /* |
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2 | ------------------------------------------------------------------------ |
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3 | $Id$ |
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4 | ------------------------------------------------------------------------ |
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5 | |
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6 | COPYRIGHT (c) 1997 |
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7 | Objective Design Systems Ltd Pty (ODS) |
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8 | All rights reserved (R) Objective Design Systems Ltd Pty |
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9 | |
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10 | The license and distribution terms for this file may be found in the |
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11 | file LICENSE in this distribution or at |
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12 | http://www.OARcorp.com/rtems/license.html. |
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13 | |
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14 | ------------------------------------------------------------------------ |
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15 | |
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16 | See header file. |
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17 | |
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18 | ------------------------------------------------------------------------ |
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19 | */ |
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20 | |
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21 | #include <rtems++/rtemsInterrupt.h> |
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22 | |
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23 | /* ---- |
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24 | Interrupt Table |
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25 | |
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26 | This table is used to re-direct the call from RTEMS to a user |
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27 | object |
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28 | */ |
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29 | |
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30 | static rtemsInterrupt **interrupt_table; |
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31 | |
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32 | // has the table been initialised |
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33 | static bool initialised = false; |
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34 | |
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35 | /* ---- |
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36 | rtemsInterrupt |
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37 | */ |
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38 | |
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39 | #include <stdlib.h> /* for malloc */ |
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40 | |
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41 | rtemsInterrupt::rtemsInterrupt() |
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42 | : vector(0), |
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43 | caught(false), |
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44 | old_handler(0), |
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45 | old_interrupt(0) |
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46 | { |
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47 | if (!initialised) |
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48 | { |
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49 | interrupt_table = (rtemsInterrupt **) |
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50 | malloc(sizeof(rtemsInterrupt *) * CPU_INTERRUPT_NUMBER_OF_VECTORS); |
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51 | for (rtems_vector_number vec = 0; |
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52 | vec < CPU_INTERRUPT_NUMBER_OF_VECTORS; |
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53 | vec++) |
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54 | { |
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55 | interrupt_table[vector] = 0; |
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56 | } |
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57 | initialised = true; |
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58 | } |
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59 | } |
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60 | |
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61 | rtemsInterrupt::~rtemsInterrupt() |
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62 | { |
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63 | release(); |
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64 | } |
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65 | |
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66 | const rtems_status_code rtemsInterrupt::isr_catch(const rtems_vector_number vec) |
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67 | { |
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68 | if (vec >= CPU_INTERRUPT_NUMBER_OF_VECTORS) |
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69 | return set_status_code(RTEMS_INVALID_NUMBER); |
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70 | |
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71 | if (caught) |
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72 | return set_status_code(RTEMS_RESOURCE_IN_USE); |
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73 | |
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74 | old_interrupt = interrupt_table[vector]; |
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75 | interrupt_table[vector] = this; |
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76 | vector = vec; |
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77 | |
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78 | set_status_code(rtems_interrupt_catch(redirector, |
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79 | vector, |
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80 | &old_handler)); |
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81 | |
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82 | if (successful()) |
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83 | caught = true; |
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84 | else |
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85 | { |
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86 | interrupt_table[vector] = old_interrupt; |
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87 | old_interrupt = 0; |
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88 | old_handler = 0; |
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89 | vector = 0; |
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90 | } |
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91 | |
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92 | return last_status_code(); |
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93 | } |
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94 | |
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95 | const rtems_status_code rtemsInterrupt::release(void) |
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96 | { |
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97 | if (caught) |
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98 | { |
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99 | set_status_code(rtems_interrupt_catch(old_handler, |
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100 | vector, |
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101 | &old_handler)); |
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102 | |
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103 | interrupt_table[vector] = old_interrupt; |
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104 | old_interrupt = 0; |
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105 | old_handler = 0; |
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106 | vector = 0; |
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107 | caught = false; |
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108 | } |
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109 | else |
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110 | set_status_code(RTEMS_SUCCESSFUL); |
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111 | |
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112 | return last_status_code(); |
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113 | } |
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114 | |
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115 | void rtemsInterrupt::redirector(rtems_vector_number vector) |
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116 | { |
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117 | if (interrupt_table[vector]) |
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118 | interrupt_table[vector]->handler(); |
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119 | } |
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