1 | /* |
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2 | * Clock Manager |
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3 | * |
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4 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * All rights assigned to U.S. Government, 1994. |
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7 | * |
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8 | * This material may be reproduced by or for the U.S. Government pursuant |
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9 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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10 | * notice must appear in all copies of this file and its derivatives. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #include <rtems/system.h> |
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16 | #include <rtems/rtems/status.h> |
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17 | #include <rtems/rtems/clock.h> |
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18 | #include <rtems/score/isr.h> |
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19 | #include <rtems/score/thread.h> |
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20 | #include <rtems/score/tod.h> |
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21 | #include <rtems/score/watchdog.h> |
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22 | |
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23 | /*PAGE |
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24 | * |
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25 | * rtems_clock_get |
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26 | * |
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27 | * This directive returns the current date and time. If the time has |
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28 | * not been set by a tm_set then an error is returned. |
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29 | * |
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30 | * Input parameters: |
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31 | * option - which value to return |
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32 | * time_buffer - pointer to output buffer (a time and date structure |
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33 | * or an interval) |
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34 | * |
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35 | * Output parameters: |
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36 | * time_buffer - output filled in |
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37 | * RTEMS_SUCCESSFUL - if successful |
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38 | * error code - if unsuccessful |
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39 | */ |
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40 | |
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41 | rtems_status_code rtems_clock_get( |
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42 | rtems_clock_get_options option, |
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43 | void *time_buffer |
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44 | ) |
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45 | { |
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46 | ISR_Level level; |
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47 | rtems_interval tmp; |
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48 | |
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49 | switch ( option ) { |
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50 | case RTEMS_CLOCK_GET_TOD: |
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51 | if ( !_TOD_Is_set ) |
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52 | return RTEMS_NOT_DEFINED; |
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53 | |
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54 | *(rtems_time_of_day *)time_buffer = _TOD_Current; |
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55 | return RTEMS_SUCCESSFUL; |
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56 | |
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57 | case RTEMS_CLOCK_GET_SECONDS_SINCE_EPOCH: |
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58 | if ( !_TOD_Is_set ) |
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59 | return RTEMS_NOT_DEFINED; |
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60 | |
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61 | *(rtems_interval *)time_buffer = _TOD_Seconds_since_epoch; |
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62 | return RTEMS_SUCCESSFUL; |
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63 | |
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64 | case RTEMS_CLOCK_GET_TICKS_SINCE_BOOT: |
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65 | *(rtems_interval *)time_buffer = _Watchdog_Ticks_since_boot; |
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66 | return RTEMS_SUCCESSFUL; |
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67 | |
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68 | case RTEMS_CLOCK_GET_TICKS_PER_SECOND: |
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69 | *(rtems_interval *)time_buffer = _TOD_Ticks_per_second; |
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70 | return RTEMS_SUCCESSFUL; |
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71 | |
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72 | case RTEMS_CLOCK_GET_TIME_VALUE: |
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73 | if ( !_TOD_Is_set ) |
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74 | return RTEMS_NOT_DEFINED; |
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75 | |
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76 | _ISR_Disable( level ); |
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77 | ((rtems_clock_time_value *)time_buffer)->seconds = |
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78 | _TOD_Seconds_since_epoch; |
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79 | tmp = _TOD_Current.ticks; |
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80 | _ISR_Enable( level ); |
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81 | |
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82 | tmp *= _TOD_Microseconds_per_tick; |
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83 | ((rtems_clock_time_value *)time_buffer)->microseconds = tmp; |
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84 | |
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85 | return RTEMS_SUCCESSFUL; |
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86 | } |
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87 | |
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88 | return RTEMS_INTERNAL_ERROR; /* should never get here */ |
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89 | |
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90 | } |
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91 | |
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92 | /*PAGE |
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93 | * |
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94 | * rtems_clock_set |
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95 | * |
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96 | * This directive sets the date and time for this node. |
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97 | * |
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98 | * Input parameters: |
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99 | * time_buffer - pointer to the time and date structure |
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100 | * |
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101 | * Output parameters: |
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102 | * RTEMS_SUCCESSFUL - if successful |
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103 | * error code - if unsuccessful |
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104 | */ |
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105 | |
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106 | rtems_status_code rtems_clock_set( |
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107 | rtems_time_of_day *time_buffer |
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108 | ) |
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109 | { |
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110 | rtems_interval seconds; |
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111 | |
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112 | if ( _TOD_Validate( time_buffer ) ) { |
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113 | seconds = _TOD_To_seconds( time_buffer ); |
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114 | _Thread_Disable_dispatch(); |
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115 | _TOD_Set( time_buffer, seconds ); |
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116 | _Thread_Enable_dispatch(); |
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117 | return RTEMS_SUCCESSFUL; |
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118 | } |
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119 | return RTEMS_INVALID_CLOCK; |
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120 | } |
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121 | |
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122 | /*PAGE |
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123 | * |
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124 | * rtems_clock_tick |
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125 | * |
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126 | * This directive notifies the executve that a tick has occurred. |
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127 | * When the tick occurs the time manager updates and maintains |
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128 | * the calendar time, timeslicing, and any timeout delays. |
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129 | * |
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130 | * Input parameters: NONE |
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131 | * |
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132 | * Output parameters: |
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133 | * RTEMS_SUCCESSFUL - always succeeds |
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134 | * |
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135 | * NOTE: This routine only works for leap-years through 2099. |
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136 | */ |
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137 | |
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138 | rtems_status_code rtems_clock_tick( void ) |
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139 | { |
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140 | _TOD_Tickle_ticks(); |
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141 | |
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142 | _Watchdog_Tickle_ticks(); |
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143 | |
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144 | _Thread_Tickle_timeslice(); |
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145 | |
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146 | if ( _Thread_Is_context_switch_necessary() && |
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147 | _Thread_Is_dispatching_enabled() ) |
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148 | _Thread_Dispatch(); |
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149 | |
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150 | return RTEMS_SUCCESSFUL; |
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151 | } |
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