[574fb67] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @ingroup mpc55xx |
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| 5 | * |
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| 6 | * @brief Source file for MPC55XX interrupt support. |
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| 7 | */ |
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| 8 | |
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| 9 | /* |
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| 10 | * Copyright (c) 2008 |
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| 11 | * Embedded Brains GmbH |
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| 12 | * Obere Lagerstr. 30 |
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| 13 | * D-82178 Puchheim |
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| 14 | * Germany |
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| 15 | * rtems@embedded-brains.de |
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| 16 | * |
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| 17 | * The license and distribution terms for this file may be found in the file |
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| 18 | * LICENSE in this distribution or at http://www.rtems.com/license/LICENSE. |
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| 19 | */ |
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| 20 | |
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| 21 | #include <mpc55xx/regs.h> |
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| 22 | |
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| 23 | #include <libcpu/raw_exception.h> |
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[d374492] | 24 | #include <libcpu/powerpc-utility.h> |
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[574fb67] | 25 | |
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| 26 | #include <bsp/irq.h> |
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| 27 | #include <bsp/irq-generic.h> |
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| 28 | #include <bsp/ppc_exc_bspsupp.h> |
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| 29 | |
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| 30 | #define RTEMS_STATUS_CHECKS_USE_PRINTK |
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| 31 | |
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| 32 | #include <rtems/status-checks.h> |
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| 33 | |
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| 34 | /** |
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[d374492] | 35 | * @brief Returns the priority @a priority of IRQ @a vector from the INTC. |
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[574fb67] | 36 | */ |
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[d374492] | 37 | rtems_status_code mpc55xx_intc_get_priority( rtems_vector_number vector, unsigned *priority) |
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[574fb67] | 38 | { |
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[d374492] | 39 | if (MPC55XX_IRQ_IS_VALID( vector)) { |
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| 40 | *priority = INTC.PSR [vector].B.PRI; |
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[574fb67] | 41 | return RTEMS_SUCCESSFUL; |
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| 42 | } else { |
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[d374492] | 43 | *priority = MPC55XX_INTC_INVALID_PRIORITY; |
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[574fb67] | 44 | return RTEMS_INVALID_NUMBER; |
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| 45 | } |
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| 46 | } |
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| 47 | |
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| 48 | /** |
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[d374492] | 49 | * @brief Sets the priority of IRQ @a vector to @a priority at the INTC. |
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[574fb67] | 50 | */ |
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[d374492] | 51 | rtems_status_code mpc55xx_intc_set_priority( rtems_vector_number vector, unsigned priority) |
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[574fb67] | 52 | { |
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[d374492] | 53 | if (MPC55XX_IRQ_IS_VALID( vector) && MPC55XX_INTC_IS_VALID_PRIORITY( priority)) { |
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| 54 | INTC.PSR [vector].B.PRI = priority; |
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| 55 | if (INTC.PSR [vector].B.PRI == priority) { |
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[574fb67] | 56 | return RTEMS_SUCCESSFUL; |
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| 57 | } else { |
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| 58 | return RTEMS_IO_ERROR; |
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| 59 | } |
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| 60 | } else { |
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| 61 | return RTEMS_INVALID_NUMBER; |
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| 62 | } |
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| 63 | } |
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| 64 | |
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| 65 | /** |
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[d374492] | 66 | * @brief Raises the software IRQ with number @a vector. |
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[574fb67] | 67 | */ |
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[d374492] | 68 | rtems_status_code mpc55xx_intc_raise_software_irq( rtems_vector_number vector) |
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[574fb67] | 69 | { |
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[d374492] | 70 | if (MPC55XX_IRQ_IS_SOFTWARE( vector)) { |
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| 71 | INTC.SSCIR [vector].B.SET = 1; |
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[574fb67] | 72 | return RTEMS_SUCCESSFUL; |
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| 73 | } else { |
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| 74 | return RTEMS_INVALID_NUMBER; |
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| 75 | } |
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| 76 | } |
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| 77 | |
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| 78 | /** |
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[d374492] | 79 | * @brief Clears the software IRQ with number @a vector. |
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[574fb67] | 80 | */ |
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[d374492] | 81 | rtems_status_code mpc55xx_intc_clear_software_irq( rtems_vector_number vector) |
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[574fb67] | 82 | { |
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[d374492] | 83 | if (MPC55XX_IRQ_IS_SOFTWARE( vector)) { |
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| 84 | INTC.SSCIR [vector].B.CLR = 1; |
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[574fb67] | 85 | return RTEMS_SUCCESSFUL; |
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| 86 | } else { |
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| 87 | return RTEMS_INVALID_NUMBER; |
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| 88 | } |
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| 89 | } |
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| 90 | |
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| 91 | /** |
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| 92 | * @brief Installs interrupt handler and sets priority. |
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| 93 | */ |
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| 94 | rtems_status_code mpc55xx_interrupt_handler_install( |
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| 95 | rtems_vector_number vector, |
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| 96 | const char *info, |
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| 97 | rtems_option options, |
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[d374492] | 98 | unsigned priority, |
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[574fb67] | 99 | rtems_interrupt_handler handler, |
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| 100 | void *arg |
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| 101 | ) |
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| 102 | { |
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| 103 | if (MPC55XX_IRQ_IS_VALID( vector) && MPC55XX_INTC_IS_VALID_PRIORITY( priority)) { |
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[d374492] | 104 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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| 105 | |
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[574fb67] | 106 | sc = rtems_interrupt_handler_install( vector, info, options, handler, arg); |
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[602aee20] | 107 | RTEMS_CHECK_SC( sc, "Install interrupt handler"); |
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[d374492] | 108 | |
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[574fb67] | 109 | return mpc55xx_intc_set_priority( vector, priority); |
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| 110 | } else { |
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| 111 | return RTEMS_INVALID_NUMBER; |
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| 112 | } |
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| 113 | } |
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| 114 | |
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| 115 | /** |
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| 116 | * @brief External exception handler. |
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| 117 | */ |
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| 118 | static int mpc55xx_external_exception_handler( BSP_Exception_frame *frame, unsigned exception_number) |
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| 119 | { |
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| 120 | /* Acknowlege interrupt request */ |
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[d374492] | 121 | rtems_vector_number vector = INTC.IACKR.B.INTVEC; |
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[574fb67] | 122 | |
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[d374492] | 123 | /* Save machine state and enable external exceptions */ |
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| 124 | uint32_t msr = ppc_external_exceptions_enable(); |
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[574fb67] | 125 | |
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| 126 | /* Dispatch interrupt handlers */ |
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[d374492] | 127 | bsp_interrupt_handler_dispatch( vector); |
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[574fb67] | 128 | |
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[d374492] | 129 | /* Restore machine state */ |
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| 130 | ppc_external_exceptions_disable( msr); |
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[574fb67] | 131 | |
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| 132 | /* End of interrupt */ |
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| 133 | INTC.EOIR.R = 1; |
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| 134 | |
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| 135 | return 0; |
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| 136 | } |
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| 137 | |
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| 138 | rtems_status_code bsp_interrupt_facility_initialize() |
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| 139 | { |
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| 140 | /* Install exception handler */ |
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| 141 | if (ppc_exc_set_handler( ASM_EXT_VECTOR, mpc55xx_external_exception_handler)) { |
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| 142 | return RTEMS_IO_ERROR; |
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| 143 | } |
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| 144 | |
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| 145 | /* Initialize interrupt controller */ |
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| 146 | |
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| 147 | /* Software vector mode */ |
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| 148 | INTC.MCR.B.VTES = 0; |
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| 149 | INTC.MCR.B.HVEN = 0; |
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| 150 | |
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| 151 | /* Set current priority to 0 */ |
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| 152 | INTC.CPR.B.PRI = 0; |
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| 153 | |
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| 154 | return RTEMS_SUCCESSFUL; |
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| 155 | } |
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| 156 | |
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| 157 | rtems_status_code bsp_interrupt_vector_enable( rtems_vector_number vector) |
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| 158 | { |
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| 159 | if (MPC55XX_IRQ_IS_VALID( vector)) { |
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| 160 | return mpc55xx_intc_set_priority( vector, MPC55XX_INTC_DEFAULT_PRIORITY); |
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| 161 | } else { |
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| 162 | return RTEMS_SUCCESSFUL; |
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| 163 | } |
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| 164 | } |
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| 165 | |
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| 166 | rtems_status_code bsp_interrupt_vector_disable( rtems_vector_number vector) |
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| 167 | { |
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| 168 | if (MPC55XX_IRQ_IS_VALID( vector)) { |
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| 169 | return mpc55xx_intc_set_priority( vector, MPC55XX_INTC_DISABLED_PRIORITY); |
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| 170 | } else { |
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| 171 | return RTEMS_SUCCESSFUL; |
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| 172 | } |
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| 173 | } |
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| 174 | |
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| 175 | void bsp_interrupt_handler_default( rtems_vector_number vector) |
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| 176 | { |
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| 177 | /* Do nothing */ |
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| 178 | } |
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