[0074691a] | 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[CPU_INTERRUPT_NUMBER_OF_VECTORS]; |
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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 | rtemsInterrupt::rtemsInterrupt() |
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| 40 | : vector(0), |
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| 41 | caught(false), |
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| 42 | old_handler(0), |
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| 43 | old_interrupt(0) |
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| 44 | { |
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| 45 | if (!initialised) |
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| 46 | { |
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| 47 | for (rtems_vector_number vec = 0; |
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| 48 | vec < CPU_INTERRUPT_NUMBER_OF_VECTORS; |
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| 49 | vec++) |
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| 50 | { |
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| 51 | interrupt_table[vector] = 0; |
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| 52 | } |
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| 53 | initialised = true; |
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| 54 | } |
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| 55 | } |
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| 56 | |
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[bf4cdb70] | 57 | rtemsInterrupt::~rtemsInterrupt() |
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| 58 | { |
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| 59 | release(); |
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| 60 | } |
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| 61 | |
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[0074691a] | 62 | const rtems_status_code rtemsInterrupt::isr_catch(const rtems_vector_number vec) |
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| 63 | { |
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| 64 | if (vec >= CPU_INTERRUPT_NUMBER_OF_VECTORS) |
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| 65 | return set_status_code(RTEMS_INVALID_NUMBER); |
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| 66 | |
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| 67 | if (caught) |
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| 68 | return set_status_code(RTEMS_RESOURCE_IN_USE); |
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| 69 | |
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| 70 | old_interrupt = interrupt_table[vector]; |
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| 71 | interrupt_table[vector] = this; |
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| 72 | vector = vec; |
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| 73 | |
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| 74 | set_status_code(rtems_interrupt_catch(redirector, |
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| 75 | vector, |
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| 76 | &old_handler)); |
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| 77 | |
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| 78 | if (successful()) |
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| 79 | caught = true; |
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| 80 | else |
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| 81 | { |
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| 82 | interrupt_table[vector] = old_interrupt; |
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| 83 | old_interrupt = 0; |
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| 84 | old_handler = 0; |
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| 85 | vector = 0; |
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| 86 | } |
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| 87 | |
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| 88 | return last_status_code(); |
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| 89 | } |
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| 90 | |
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| 91 | const rtems_status_code rtemsInterrupt::release(void) |
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| 92 | { |
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| 93 | if (caught) |
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| 94 | { |
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| 95 | set_status_code(rtems_interrupt_catch(old_handler, |
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| 96 | vector, |
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| 97 | &old_handler)); |
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| 98 | |
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| 99 | interrupt_table[vector] = old_interrupt; |
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| 100 | old_interrupt = 0; |
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| 101 | old_handler = 0; |
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| 102 | vector = 0; |
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| 103 | caught = false; |
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| 104 | } |
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| 105 | else |
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| 106 | set_status_code(RTEMS_SUCCESSFUL); |
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| 107 | |
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| 108 | return last_status_code(); |
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| 109 | } |
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| 110 | |
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| 111 | void rtemsInterrupt::redirector(rtems_vector_number vector) |
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| 112 | { |
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| 113 | if (interrupt_table[vector]) |
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| 114 | interrupt_table[vector]->handler(); |
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| 115 | } |
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