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annotate packages/devs/watchdog/current/src/emulate.cxx @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
parents c38311975d4f
children
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1 //==========================================================================
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2 //
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3 // 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 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: nickg
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36 // Date: 1998-07-29
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37 // Purpose: Watchdog class implementation
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38 // Description: Contains an implementation of the Watchdog class for use
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39 // when there is no hardware watchdog timer. Instead it is
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40 // emulated using an Alarm object.
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <pkgconf/watchdog.h> // watchdog configuration file
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47
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48 #ifdef CYGIMP_WATCHDOG_EMULATE
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49
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50 #include <pkgconf/kernel.h> // Kernel config
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51
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52 #include <cyg/kernel/ktypes.h> // base kernel types
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53 #include <cyg/infra/cyg_trac.h> // tracing macros
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54 #include <cyg/infra/cyg_ass.h> // assertion macros
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55 #include <cyg/kernel/instrmnt.h> // instrumentation
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56
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57 #include <cyg/kernel/clock.hxx> // clock and alarm
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58 #include <cyg/kernel/sched.hxx> // scheduler
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59
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60 #include <cyg/devs/watchdog.hxx> // my header
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61
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62 #include <cyg/kernel/sched.inl> // scheduler inlines
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63
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64 // -------------------------------------------------------------------------
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65 // Forward definitions
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66
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67 static cyg_alarm_fn watchdog_alarm;
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68
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69 // -------------------------------------------------------------------------
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70 // Statics
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71
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72 // A static pointer to the single system defined watchdog device.
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73 Cyg_Watchdog Cyg_Watchdog::watchdog;
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74
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75 static Cyg_Alarm alarm( Cyg_Clock::real_time_clock, watchdog_alarm, 0 );
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76
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77 // One second's worth of ticks.
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78 static cyg_tick_count one_sec;
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79
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80 // -------------------------------------------------------------------------
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81 // Constructor
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82
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83 Cyg_Watchdog::Cyg_Watchdog()
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84 {
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85 CYG_REPORT_FUNCTION();
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86
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87 action_list = 0;
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88
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89 Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
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90
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91 one_sec = ( res.divisor * 1000000000LL ) / res.dividend ;
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92
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93 resolution = 1000000000LL;
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94
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95 CYG_REPORT_RETURN();
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96 }
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97
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98 // -------------------------------------------------------------------------
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99 // Return reset resolution
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100
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101 cyg_uint64 Cyg_Watchdog::get_resolution()
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102 {
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103 return resolution;
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104 }
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105
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106 // -------------------------------------------------------------------------
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107 // Start the watchdog running.
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108
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109 void Cyg_Watchdog::start()
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110 {
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111 CYG_REPORT_FUNCTION();
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112
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113 Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
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114
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115 // Set alarm to a one second single-shot trigger
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116 alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 );
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117
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118 CYG_REPORT_RETURN();
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119 }
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120
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121 // -------------------------------------------------------------------------
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122 // Reset watchdog timer. This needs to be called regularly to prevent
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123 // the watchdog firing.
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124
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125 void Cyg_Watchdog::reset()
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126 {
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127 CYG_REPORT_FUNCTION();
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128
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129 Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
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130
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131 Cyg_Scheduler::lock();
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132
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133 // Set alarm to a one second single-shot trigger
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134 alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 );
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135
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136 Cyg_Scheduler::unlock();
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137
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138 CYG_REPORT_RETURN();
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139 }
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140
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141 // -------------------------------------------------------------------------
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142 // Trigger the watchdog as if the timer had expired.
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143
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144 void Cyg_Watchdog::trigger()
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145 {
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146 CYG_REPORT_FUNCTION();
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147
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148 Cyg_Scheduler::lock();
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149
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150 // Disable alarm just in case
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151 alarm.disable();
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152
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153 Cyg_Watchdog_Action *act = action_list;
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154
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155 while( 0 != act )
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156 {
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157 act->action( act->data );
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158
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159 act = act->next;
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160 }
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161
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162 Cyg_Scheduler::unlock();
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163
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164 CYG_REPORT_RETURN();
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165 }
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166
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167 // -------------------------------------------------------------------------
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168 // Register an action routine that will be called when the timer
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169 // triggers.
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170
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171 void Cyg_Watchdog::install_action( Cyg_Watchdog_Action *action )
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172 {
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173 CYG_REPORT_FUNCTION();
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174
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175 Cyg_Scheduler::lock();
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176
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177 action->next = action_list;
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178 action_list = action;
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179
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180 Cyg_Scheduler::unlock();
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181
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182 CYG_REPORT_RETURN();
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183 }
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184
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185 // -------------------------------------------------------------------------
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186 // Deregister a previously registered action routine.
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187
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188 void Cyg_Watchdog::uninstall_action( Cyg_Watchdog_Action *action )
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189 {
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190 CYG_REPORT_FUNCTION();
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191
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192 Cyg_Scheduler::lock();
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193
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194 Cyg_Watchdog_Action **act_ptr = &action_list;
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195
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196 while( 0 != *act_ptr )
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197 {
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198 Cyg_Watchdog_Action *a = *act_ptr;
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199
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200 if( a == action )
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201 {
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202 *act_ptr = a->next;
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203 break;
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204 }
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205 act_ptr = &a->next;
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206 }
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207
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208 Cyg_Scheduler::unlock();
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209
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210 CYG_REPORT_RETURN();
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211 }
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212
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213 // -------------------------------------------------------------------------
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214 // Alarm function
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215
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216 void watchdog_alarm( Cyg_Alarm *a, CYG_ADDRWORD data)
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217 {
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218 CYG_REPORT_FUNCTION();
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219
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220 Cyg_Watchdog::watchdog.trigger();
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221 }
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222
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223 #endif // CYGIMP_WATCHDOG_EMULATE
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224 // -------------------------------------------------------------------------
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225 // EOF watchdog/emulate.cxx