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86d58c02cc
* clock/clock.c, console/console.c, include/bsp.h, shmsupp/addrconv.c, shmsupp/cause_intr.c, shmsupp/getcfg.c, shmsupp/lock.c, shmsupp/mpisr.c, startup/bspclean.c, startup/bspstart.c, startup/exit.c, startup/setvec.c, timer/timer.c: URL for license changed.
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/* timer.c
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*
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* This file manages the interval timer on the PA-RISC.
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*
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* NOTE: It is important that the timer start/stop overhead be
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* determined when porting or modifying this code.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#include <bsp.h>
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#include <time.h>
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#include <sys/time.h>
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struct timeval Timer_start;
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struct timeval Timer_stop;
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struct timezone Time_zone;
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rtems_boolean Timer_driver_Find_average_overhead;
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void Timer_initialize()
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{
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gettimeofday( &Timer_start, &Time_zone );
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}
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#define AVG_OVERHEAD 0 /* It typically takes xxx microseconds */
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/* (XX countdowns) to start/stop the timer. */
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#define LEAST_VALID 10 /* Don't trust a value lower than this */
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int Read_timer()
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{
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int total;
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gettimeofday( &Timer_stop, &Time_zone );
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if ( Timer_stop.tv_sec == Timer_start.tv_sec )
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total = Timer_stop.tv_usec - Timer_start.tv_usec;
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else {
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total = 1000000 - Timer_start.tv_usec;
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total += (Timer_stop.tv_sec - Timer_start.tv_sec - 1) * 1000000;
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total += Timer_stop.tv_usec;
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}
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if ( Timer_driver_Find_average_overhead == 1 )
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return total; /* in countdown units */
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else {
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if ( total < LEAST_VALID )
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return 0; /* below timer resolution */
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return total - AVG_OVERHEAD;
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}
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}
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rtems_status_code Empty_function( void )
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{
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return RTEMS_SUCCESSFUL;
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}
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void Set_find_average_overhead(
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rtems_boolean find_flag
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)
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{
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Timer_driver_Find_average_overhead = find_flag;
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}
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