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Diffstat (limited to 'c/src/exec/rtems/src/rtclock.c')
-rw-r--r-- | c/src/exec/rtems/src/rtclock.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/c/src/exec/rtems/src/rtclock.c b/c/src/exec/rtems/src/rtclock.c new file mode 100644 index 0000000000..388e6f091f --- /dev/null +++ b/c/src/exec/rtems/src/rtclock.c @@ -0,0 +1,151 @@ +/* + * Clock Manager + * + * COPYRIGHT (c) 1989-1997. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may in + * the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <rtems/system.h> +#include <rtems/rtems/status.h> +#include <rtems/rtems/clock.h> +#include <rtems/score/isr.h> +#include <rtems/score/thread.h> +#include <rtems/score/tod.h> +#include <rtems/score/watchdog.h> + +/*PAGE + * + * rtems_clock_get + * + * This directive returns the current date and time. If the time has + * not been set by a tm_set then an error is returned. + * + * Input parameters: + * option - which value to return + * time_buffer - pointer to output buffer (a time and date structure + * or an interval) + * + * Output parameters: + * time_buffer - output filled in + * RTEMS_SUCCESSFUL - if successful + * error code - if unsuccessful + */ + +rtems_status_code rtems_clock_get( + rtems_clock_get_options option, + void *time_buffer +) +{ + ISR_Level level; + rtems_interval tmp; + + switch ( option ) { + case RTEMS_CLOCK_GET_TOD: + if ( !_TOD_Is_set ) + return RTEMS_NOT_DEFINED; + + *(rtems_time_of_day *)time_buffer = _TOD_Current; + return RTEMS_SUCCESSFUL; + + case RTEMS_CLOCK_GET_SECONDS_SINCE_EPOCH: + if ( !_TOD_Is_set ) + return RTEMS_NOT_DEFINED; + + *(rtems_interval *)time_buffer = _TOD_Seconds_since_epoch; + return RTEMS_SUCCESSFUL; + + case RTEMS_CLOCK_GET_TICKS_SINCE_BOOT: + *(rtems_interval *)time_buffer = _Watchdog_Ticks_since_boot; + return RTEMS_SUCCESSFUL; + + case RTEMS_CLOCK_GET_TICKS_PER_SECOND: + *(rtems_interval *)time_buffer = _TOD_Ticks_per_second; + return RTEMS_SUCCESSFUL; + + case RTEMS_CLOCK_GET_TIME_VALUE: + if ( !_TOD_Is_set ) + return RTEMS_NOT_DEFINED; + + _ISR_Disable( level ); + ((rtems_clock_time_value *)time_buffer)->seconds = + _TOD_Seconds_since_epoch; + tmp = _TOD_Current.ticks; + _ISR_Enable( level ); + + tmp *= _TOD_Microseconds_per_tick; + ((rtems_clock_time_value *)time_buffer)->microseconds = tmp; + + return RTEMS_SUCCESSFUL; + } + + return RTEMS_INTERNAL_ERROR; /* should never get here */ + +} + +/*PAGE + * + * rtems_clock_set + * + * This directive sets the date and time for this node. + * + * Input parameters: + * time_buffer - pointer to the time and date structure + * + * Output parameters: + * RTEMS_SUCCESSFUL - if successful + * error code - if unsuccessful + */ + +rtems_status_code rtems_clock_set( + rtems_time_of_day *time_buffer +) +{ + rtems_interval seconds; + + if ( _TOD_Validate( time_buffer ) ) { + seconds = _TOD_To_seconds( time_buffer ); + _Thread_Disable_dispatch(); + _TOD_Set( time_buffer, seconds ); + _Thread_Enable_dispatch(); + return RTEMS_SUCCESSFUL; + } + return RTEMS_INVALID_CLOCK; +} + +/*PAGE + * + * rtems_clock_tick + * + * This directive notifies the executve that a tick has occurred. + * When the tick occurs the time manager updates and maintains + * the calendar time, timeslicing, and any timeout delays. + * + * Input parameters: NONE + * + * Output parameters: + * RTEMS_SUCCESSFUL - always succeeds + * + * NOTE: This routine only works for leap-years through 2099. + */ + +rtems_status_code rtems_clock_tick( void ) +{ + _TOD_Tickle_ticks(); + + _Watchdog_Tickle_ticks(); + + _Thread_Tickle_timeslice(); + + if ( _Thread_Is_context_switch_necessary() && + _Thread_Is_dispatching_enabled() ) + _Thread_Dispatch(); + + return RTEMS_SUCCESSFUL; +} |