1 | /** |
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2 | * @file rtems/rtems/intr.h |
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3 | * |
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4 | * @defgroup ClassicINTR Interrupts |
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5 | * |
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6 | * @ingroup ClassicRTEMS |
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7 | * @brief Header file for Interrupt Manager |
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8 | * |
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9 | * This include file contains all the constants and structures associated with |
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10 | * the Interrupt Manager. |
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11 | */ |
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12 | |
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13 | /* COPYRIGHT (c) 1989-2013. |
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14 | * On-Line Applications Research Corporation (OAR). |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.org/license/LICENSE. |
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19 | */ |
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20 | |
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21 | #ifndef _RTEMS_RTEMS_INTR_H |
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22 | #define _RTEMS_RTEMS_INTR_H |
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23 | |
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24 | #ifdef __cplusplus |
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25 | extern "C" { |
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26 | #endif |
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27 | |
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28 | #include <rtems/rtems/status.h> |
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29 | #include <rtems/score/isr.h> |
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30 | #include <rtems/score/isrlock.h> |
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31 | |
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32 | /** |
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33 | * @defgroup ClassicINTR Interrupts |
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34 | * |
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35 | * @ingroup ClassicRTEMS |
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36 | * |
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37 | * This encapsulates functionality related to the Classic API Interrupt |
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38 | * Manager. |
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39 | */ |
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40 | /**@{*/ |
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41 | |
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42 | /** |
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43 | * @brief Interrupt level type. |
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44 | */ |
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45 | typedef ISR_Level rtems_interrupt_level; |
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46 | |
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47 | /** |
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48 | * @brief Control block type used to manage the vectors. |
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49 | */ |
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50 | typedef ISR_Vector_number rtems_vector_number; |
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51 | |
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52 | /** |
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53 | * @brief Return type for interrupt handler. |
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54 | */ |
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55 | typedef ISR_Handler rtems_isr; |
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56 | |
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57 | #if (CPU_SIMPLE_VECTORED_INTERRUPTS == FALSE) |
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58 | |
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59 | typedef ISR_Handler_entry rtems_isr_entry; |
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60 | |
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61 | #else |
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62 | /** |
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63 | * @brief Interrupt handler type. |
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64 | * |
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65 | * @see rtems_interrupt_catch() |
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66 | */ |
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67 | typedef rtems_isr ( *rtems_isr_entry )( |
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68 | rtems_vector_number |
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69 | ); |
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70 | |
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71 | /** |
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72 | * @brief RTEMS Interrupt Catch |
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73 | * |
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74 | * This directive installs @a new_isr_handler as the RTEMS interrupt service |
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75 | * routine for the interrupt vector with number @a vector. The previous RTEMS |
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76 | * interrupt service routine is returned in @a old_isr_handler. |
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77 | * |
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78 | * @param[in] new_isr_handler is the address of interrupt service routine |
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79 | * @param[in] vector is the interrupt vector number |
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80 | * @param[in] old_isr_handler address at which to store previous ISR address |
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81 | * |
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82 | * @retval RTEMS_SUCCESSFUL and *old_isr_handler filled with previous ISR |
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83 | * address |
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84 | */ |
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85 | rtems_status_code rtems_interrupt_catch( |
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86 | rtems_isr_entry new_isr_handler, |
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87 | rtems_vector_number vector, |
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88 | rtems_isr_entry *old_isr_handler |
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89 | ); |
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90 | #endif |
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91 | |
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92 | /** |
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93 | * @brief Disable RTEMS Interrupt |
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94 | * |
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95 | * @note The interrupt level shall be of type @ref rtems_interrupt_level. |
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96 | */ |
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97 | #define rtems_interrupt_disable( _isr_cookie ) \ |
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98 | _ISR_Disable(_isr_cookie) |
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99 | |
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100 | /** |
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101 | * @brief Enable RTEMS Interrupt |
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102 | * |
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103 | * @note The interrupt level shall be of type @ref rtems_interrupt_level. |
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104 | */ |
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105 | #define rtems_interrupt_enable( _isr_cookie ) \ |
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106 | _ISR_Enable(_isr_cookie) |
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107 | |
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108 | /** |
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109 | * @brief Flash RTEMS Interrupt |
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110 | * |
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111 | * @note The interrupt level shall be of type @ref rtems_interrupt_level. |
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112 | */ |
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113 | #define rtems_interrupt_flash( _isr_cookie ) \ |
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114 | _ISR_Flash(_isr_cookie) |
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115 | |
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116 | /** |
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117 | * @brief RTEMS Interrupt Is in Progress |
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118 | * |
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119 | * A return value of true indicates that the caller is an interrupt service |
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120 | * routine and @b not a thread. The directives available to an interrupt |
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121 | * service routine are restricted. |
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122 | */ |
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123 | #define rtems_interrupt_is_in_progress() \ |
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124 | _ISR_Is_in_progress() |
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125 | |
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126 | /** |
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127 | * @brief This routine generates an interrupt. |
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128 | * |
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129 | * @note No implementation. |
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130 | */ |
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131 | #define rtems_interrupt_cause( _interrupt_to_cause ) |
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132 | |
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133 | /** |
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134 | * @brief This routine clears the specified interrupt. |
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135 | * |
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136 | * @note No implementation. |
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137 | */ |
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138 | #define rtems_interrupt_clear( _interrupt_to_clear ) |
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139 | |
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140 | /** |
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141 | * @defgroup ClassicINTRLocks Interrupt Locks |
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142 | * |
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143 | * @ingroup ClassicINTR |
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144 | * |
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145 | * @brief Low-level lock to protect critical sections accessed by threads and |
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146 | * interrupt service routines. |
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147 | * |
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148 | * On single processor configurations the interrupt locks degrade to simple |
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149 | * interrupt disable/enable sequences. No additional storage or objects are |
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150 | * required. |
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151 | * |
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152 | * This synchronization primitive is supported on SMP configurations. Here SMP |
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153 | * locks are used. |
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154 | * @{ |
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155 | */ |
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156 | |
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157 | /** |
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158 | * @brief Interrupt lock control. |
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159 | */ |
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160 | typedef ISR_lock_Control rtems_interrupt_lock; |
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161 | |
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162 | /** |
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163 | * @brief Local interrupt lock context for acquire and release pairs. |
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164 | */ |
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165 | typedef ISR_lock_Context rtems_interrupt_lock_context; |
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166 | |
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167 | /** |
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168 | * @brief Initializer for static initialization of interrupt locks. |
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169 | */ |
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170 | #define RTEMS_INTERRUPT_LOCK_INITIALIZER( _name ) ISR_LOCK_INITIALIZER( _name ) |
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171 | |
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172 | /** |
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173 | * @brief Initializes an interrupt lock. |
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174 | * |
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175 | * Concurrent initialization leads to unpredictable results. |
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176 | * |
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177 | * @param[in,out] _lock The interrupt lock. |
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178 | * @param[in] _name The name for the interrupt lock. This name must be |
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179 | * persistent throughout the life time of this lock. |
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180 | */ |
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181 | #define rtems_interrupt_lock_initialize( _lock, _name ) \ |
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182 | _ISR_lock_Initialize( _lock, _name ) |
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183 | |
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184 | /** |
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185 | * @brief Destroys an interrupt lock. |
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186 | * |
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187 | * Concurrent destruction leads to unpredictable results. |
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188 | * |
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189 | * @param[in,out] _lock The interrupt lock control. |
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190 | */ |
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191 | #define rtems_interrupt_lock_destroy( _lock ) \ |
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192 | _ISR_lock_Destroy( _lock ) |
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193 | |
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194 | /** |
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195 | * @brief Acquires an interrupt lock. |
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196 | * |
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197 | * Interrupts will be disabled. On SMP configurations this function acquires |
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198 | * an SMP lock. |
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199 | * |
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200 | * This function can be used in thread and interrupt context. |
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201 | * |
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202 | * @param[in,out] _lock The interrupt lock. |
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203 | * @param[in,out] _lock_context The local interrupt lock context for an acquire |
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204 | * and release pair. |
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205 | * |
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206 | * @see rtems_interrupt_lock_release(). |
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207 | */ |
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208 | #define rtems_interrupt_lock_acquire( _lock, _lock_context ) \ |
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209 | _ISR_lock_ISR_disable_and_acquire( _lock, _lock_context ) |
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210 | |
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211 | /** |
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212 | * @brief Releases an interrupt lock. |
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213 | * |
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214 | * The interrupt status will be restored. On SMP configurations this function |
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215 | * releases an SMP lock. |
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216 | * |
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217 | * This function can be used in thread and interrupt context. |
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218 | * |
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219 | * @param[in,out] _lock The interrupt lock. |
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220 | * @param[in,out] _lock_context The local interrupt lock context for an acquire |
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221 | * and release pair. |
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222 | * |
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223 | * @see rtems_interrupt_lock_acquire(). |
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224 | */ |
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225 | #define rtems_interrupt_lock_release( _lock, _lock_context ) \ |
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226 | _ISR_lock_Release_and_ISR_enable( _lock, _lock_context ) |
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227 | |
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228 | /** |
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229 | * @brief Acquires an interrupt lock in the corresponding interrupt service |
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230 | * routine. |
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231 | * |
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232 | * The interrupt status will remain unchanged. On SMP configurations this |
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233 | * function acquires an SMP lock. |
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234 | * |
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235 | * In case the corresponding interrupt service routine can be interrupted by |
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236 | * higher priority interrupts and these interrupts enter the critical section |
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237 | * protected by this lock, then the result is unpredictable. |
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238 | * |
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239 | * @param[in,out] _lock The interrupt lock. |
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240 | * @param[in,out] _lock_context The local interrupt lock context for an acquire |
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241 | * and release pair. |
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242 | * |
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243 | * @see rtems_interrupt_lock_release_isr(). |
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244 | */ |
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245 | #define rtems_interrupt_lock_acquire_isr( _lock, _lock_context ) \ |
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246 | _ISR_lock_Acquire( _lock, _lock_context ) |
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247 | |
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248 | /** |
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249 | * @brief Releases an interrupt lock in the corresponding interrupt service |
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250 | * routine. |
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251 | * |
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252 | * The interrupt status will remain unchanged. On SMP configurations this |
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253 | * function releases an SMP lock. |
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254 | * |
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255 | * @param[in,out] _lock The interrupt lock. |
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256 | * @param[in,out] _lock_context The local interrupt lock context for an acquire |
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257 | * and release pair. |
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258 | * |
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259 | * @see rtems_interrupt_lock_acquire_isr(). |
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260 | */ |
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261 | #define rtems_interrupt_lock_release_isr( _lock, _lock_context ) \ |
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262 | _ISR_lock_Release( _lock, _lock_context ) |
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263 | |
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264 | /** @} */ |
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265 | |
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266 | #ifdef __cplusplus |
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267 | } |
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268 | #endif |
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269 | |
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270 | /**@}*/ |
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271 | |
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272 | #endif |
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273 | /* end of include file */ |
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