1 | /* |
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2 | * Time of Day (TOD) Handler |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * All rights assigned to U.S. Government, 1994. |
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8 | * |
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9 | * This material may be reproduced by or for the U.S. Government pursuant |
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10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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11 | * notice must appear in all copies of this file and its derivatives. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/core/object.h> |
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18 | #include <rtems/core/thread.h> |
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19 | #include <rtems/core/tod.h> |
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20 | #include <rtems/core/watchdog.h> |
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21 | |
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22 | /*PAGE |
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23 | * |
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24 | * _TOD_Handler_initialization |
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25 | * |
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26 | * This routine initializes the time of day handler. |
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27 | * |
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28 | * Input parameters: |
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29 | * microseconds_per_tick - microseconds between clock ticks |
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30 | * |
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31 | * Output parameters: NONE |
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32 | */ |
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33 | |
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34 | void _TOD_Handler_initialization( |
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35 | unsigned32 microseconds_per_tick |
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36 | ) |
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37 | { |
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38 | _TOD_Microseconds_per_tick = microseconds_per_tick; |
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39 | |
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40 | _TOD_Ticks_since_boot = 0; |
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41 | _TOD_Seconds_since_epoch = 0; |
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42 | |
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43 | _TOD_Current.year = TOD_BASE_YEAR; |
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44 | _TOD_Current.month = 1; |
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45 | _TOD_Current.day = 1; |
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46 | _TOD_Current.hour = 0; |
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47 | _TOD_Current.minute = 0; |
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48 | _TOD_Current.second = 0; |
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49 | _TOD_Current.ticks = 0; |
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50 | |
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51 | if ( microseconds_per_tick == 0 ) |
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52 | _TOD_Ticks_per_second = 0; |
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53 | else |
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54 | _TOD_Ticks_per_second = |
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55 | TOD_MICROSECONDS_PER_SECOND / microseconds_per_tick; |
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56 | |
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57 | _Watchdog_Initialize( &_TOD_Seconds_watchdog, _TOD_Tickle, 0, NULL ); |
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58 | } |
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59 | |
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60 | /*PAGE |
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61 | * |
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62 | * _TOD_Set |
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63 | * |
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64 | * This rountine sets the current date and time with the specified |
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65 | * new date and time structure. |
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66 | * |
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67 | * Input parameters: |
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68 | * the_tod - pointer to the time and date structure |
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69 | * seconds_since_epoch - seconds since system epoch |
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70 | * |
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71 | * Output parameters: NONE |
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72 | */ |
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73 | |
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74 | void _TOD_Set( |
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75 | TOD_Control *the_tod, |
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76 | Watchdog_Interval seconds_since_epoch |
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77 | ) |
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78 | { |
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79 | Watchdog_Interval ticks_until_next_second; |
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80 | |
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81 | _Thread_Disable_dispatch(); |
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82 | _TOD_Deactivate(); |
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83 | |
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84 | if ( seconds_since_epoch < _TOD_Seconds_since_epoch ) |
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85 | _Watchdog_Adjust_seconds( WATCHDOG_BACKWARD, |
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86 | _TOD_Seconds_since_epoch - seconds_since_epoch ); |
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87 | else |
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88 | _Watchdog_Adjust_seconds( WATCHDOG_FORWARD, |
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89 | seconds_since_epoch - _TOD_Seconds_since_epoch ); |
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90 | |
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91 | ticks_until_next_second = _TOD_Ticks_per_second; |
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92 | if ( ticks_until_next_second > _TOD_Current.ticks ) |
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93 | ticks_until_next_second -= _TOD_Current.ticks; |
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94 | |
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95 | _TOD_Current = *the_tod; |
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96 | _TOD_Seconds_since_epoch = seconds_since_epoch; |
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97 | _TOD_Activate( ticks_until_next_second ); |
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98 | |
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99 | _Thread_Enable_dispatch(); |
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100 | } |
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101 | |
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102 | /*PAGE |
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103 | * |
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104 | * _TOD_Validate |
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105 | * |
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106 | * This kernel routine checks the validity of a date and time structure. |
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107 | * |
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108 | * Input parameters: |
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109 | * the_tod - pointer to a time and date structure |
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110 | * |
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111 | * Output parameters: |
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112 | * TRUE - if the date, time, and tick are valid |
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113 | * FALSE - if the the_tod is invalid |
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114 | * |
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115 | * NOTE: This routine only works for leap-years through 2099. |
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116 | */ |
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117 | |
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118 | boolean _TOD_Validate( |
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119 | TOD_Control *the_tod |
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120 | ) |
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121 | { |
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122 | unsigned32 days_in_month; |
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123 | |
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124 | if ((the_tod->ticks >= _TOD_Ticks_per_second) || |
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125 | (the_tod->second >= TOD_SECONDS_PER_MINUTE) || |
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126 | (the_tod->minute >= TOD_MINUTES_PER_HOUR) || |
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127 | (the_tod->hour >= TOD_HOURS_PER_DAY) || |
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128 | (the_tod->month == 0) || |
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129 | (the_tod->month > TOD_MONTHS_PER_YEAR) || |
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130 | (the_tod->year < TOD_BASE_YEAR) || |
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131 | (the_tod->day == 0) ) |
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132 | return FALSE; |
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133 | |
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134 | if ( (the_tod->year % 4) == 0 ) |
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135 | days_in_month = _TOD_Days_per_month[ 1 ][ the_tod->month ]; |
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136 | else |
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137 | days_in_month = _TOD_Days_per_month[ 0 ][ the_tod->month ]; |
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138 | |
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139 | if ( the_tod->day > days_in_month ) |
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140 | return FALSE; |
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141 | |
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142 | return TRUE; |
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143 | } |
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144 | |
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145 | /*PAGE |
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146 | * |
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147 | * _TOD_To_seconds |
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148 | * |
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149 | * This routine returns the seconds from the epoch until the |
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150 | * current date and time. |
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151 | * |
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152 | * Input parameters: |
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153 | * the_tod - pointer to the time and date structure |
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154 | * |
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155 | * Output parameters: |
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156 | * returns - seconds since epoch until the_tod |
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157 | */ |
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158 | |
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159 | unsigned32 _TOD_To_seconds( |
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160 | TOD_Control *the_tod |
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161 | ) |
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162 | { |
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163 | unsigned32 time; |
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164 | unsigned32 year_mod_4; |
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165 | |
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166 | time = the_tod->day - 1; |
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167 | year_mod_4 = the_tod->year & 3; |
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168 | |
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169 | if ( year_mod_4 == 0 ) |
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170 | time += _TOD_Days_to_date[ 1 ][ the_tod->month ]; |
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171 | else |
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172 | time += _TOD_Days_to_date[ 0 ][ the_tod->month ]; |
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173 | |
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174 | time += ( (the_tod->year - TOD_BASE_YEAR) / 4 ) * |
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175 | ( (TOD_DAYS_PER_YEAR * 4) + 1); |
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176 | |
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177 | time += _TOD_Days_since_last_leap_year[ year_mod_4 ]; |
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178 | |
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179 | time *= TOD_SECONDS_PER_DAY; |
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180 | |
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181 | time += ((the_tod->hour * TOD_MINUTES_PER_HOUR) + the_tod->minute) |
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182 | * TOD_SECONDS_PER_MINUTE; |
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183 | |
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184 | time += the_tod->second; |
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185 | |
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186 | return( time ); |
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187 | } |
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188 | |
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189 | /*PAGE |
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190 | * |
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191 | * _TOD_Tickle |
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192 | * |
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193 | * This routine updates the calendar time and tickles the |
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194 | * per second watchdog timer chain. |
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195 | * |
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196 | * Input parameters: |
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197 | * ignored - this parameter is ignored |
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198 | * |
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199 | * Output parameters: NONE |
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200 | * |
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201 | * NOTE: This routine only works for leap-years through 2099. |
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202 | */ |
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203 | |
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204 | void _TOD_Tickle( |
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205 | Objects_Id id, |
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206 | void *ignored |
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207 | ) |
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208 | { |
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209 | unsigned32 leap; |
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210 | |
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211 | _TOD_Current.ticks = 0; |
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212 | ++_TOD_Seconds_since_epoch; |
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213 | if ( ++_TOD_Current.second >= TOD_SECONDS_PER_MINUTE ) { |
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214 | _TOD_Current.second = 0; |
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215 | if ( ++_TOD_Current.minute >= TOD_MINUTES_PER_HOUR ) { |
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216 | _TOD_Current.minute = 0; |
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217 | if ( ++_TOD_Current.hour >= TOD_HOURS_PER_DAY ) { |
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218 | _TOD_Current.hour = 0; |
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219 | if ( _TOD_Current.year & 0x3 ) leap = 0; |
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220 | else leap = 1; |
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221 | if ( ++_TOD_Current.day > |
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222 | _TOD_Days_per_month[ leap ][ _TOD_Current.month ]) { |
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223 | _TOD_Current.day = 1; |
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224 | if ( ++_TOD_Current.month > TOD_MONTHS_PER_YEAR ) { |
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225 | _TOD_Current.month = 1; |
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226 | _TOD_Current.year++; |
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227 | } |
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228 | } |
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229 | } |
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230 | } |
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231 | } |
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232 | |
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233 | _Watchdog_Tickle_seconds(); |
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234 | _Watchdog_Insert_ticks( &_TOD_Seconds_watchdog, _TOD_Ticks_per_second, |
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235 | WATCHDOG_ACTIVATE_NOW ); |
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236 | } |
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