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* Added execute permissions to files missed in conversion from CVS
author alexs
date Thu, 26 Mar 2009 20:39:18 +0000
parents 74dbf4c3f2e1
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1 //==========================================================================
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2 //
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3 // io/watchdog/emulate.cxx
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4 //
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5 // Watchdog implementation emulation
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): nickg
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43 // Contributors: nickg
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44 // Date: 1998-07-29
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45 // Purpose: Watchdog class implementation
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46 // Description: Contains an implementation of the Watchdog class for use
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47 // when there is no hardware watchdog timer. Instead it is
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48 // emulated using an Alarm object.
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <pkgconf/watchdog.h> // watchdog configuration file
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55 #include <pkgconf/kernel.h> // Kernel config
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56
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57 #include <cyg/kernel/ktypes.h> // base kernel types
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58 #include <cyg/infra/cyg_trac.h> // tracing macros
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59 #include <cyg/infra/cyg_ass.h> // assertion macros
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60 #include <cyg/kernel/instrmnt.h> // instrumentation
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61
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62 #include <cyg/kernel/clock.hxx> // clock and alarm
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63 #include <cyg/kernel/sched.hxx> // scheduler
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64
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65 #include <cyg/io/watchdog.hxx> // watchdog API
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66
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67 #include <cyg/kernel/sched.inl> // scheduler inlines
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68
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69 // -------------------------------------------------------------------------
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70 // Forward definitions
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71
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72 static cyg_alarm_fn watchdog_alarm;
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73
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74 // -------------------------------------------------------------------------
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75 // Statics
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76
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77 static Cyg_Alarm alarm( Cyg_Clock::real_time_clock, watchdog_alarm, 0 );
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78
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79 // One second's worth of ticks.
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80 static cyg_tick_count one_sec;
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81
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82 // -------------------------------------------------------------------------
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83 // HW init
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84
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85 void
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86 Cyg_Watchdog::init_hw(void)
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87 {
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88 CYG_REPORT_FUNCTION();
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89
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90 Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
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91
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92 one_sec = ( res.divisor * 1000000000LL ) / res.dividend ;
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93
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94 resolution = 1000000000LL;
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95
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96 CYG_REPORT_RETURN();
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97 }
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98
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99 // -------------------------------------------------------------------------
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100 // Start the watchdog running.
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101
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102 void Cyg_Watchdog::start()
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103 {
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104 CYG_REPORT_FUNCTION();
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105
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106 Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
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107
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108 // Set alarm to a one second single-shot trigger
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109 alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 );
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110
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111 CYG_REPORT_RETURN();
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112 }
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113
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114 // -------------------------------------------------------------------------
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115 // Reset watchdog timer. This needs to be called regularly to prevent
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116 // the watchdog firing.
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117
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118 void Cyg_Watchdog::reset()
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119 {
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120 CYG_REPORT_FUNCTION();
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121
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122 Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
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123
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124 Cyg_Scheduler::lock();
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125
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126 // Set alarm to a one second single-shot trigger
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127 alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 );
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128
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129 Cyg_Scheduler::unlock();
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130
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131 CYG_REPORT_RETURN();
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132 }
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133
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134 // -------------------------------------------------------------------------
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135 // Alarm function
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136
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137 void watchdog_alarm( Cyg_Alarm *a, CYG_ADDRWORD data)
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138 {
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139 CYG_REPORT_FUNCTION();
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140
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141 // Disable alarm just in case
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142 alarm.disable();
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143
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144 Cyg_Watchdog::watchdog.trigger();
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145 }
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146
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147 // -------------------------------------------------------------------------
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148 // EOF watchdog/emulate.cxx