forked from Imagelibrary/rtems
ae361faeba
The old logic would lead to an error when multiprocessing was enabled and `LEON3_GPTIMER_BASE` was defined due to `leon3_timer_core_index` being undefined. The new logic fixes this and keeps the same intent: - If multiprocessing is not enabled, the timer index is 0 - If multiprocessing is enabled and `LEON3_GPTIMER_BASE` is defined, the timer index is twice the CPU boot index - If multiprocessing is enabled and `LEON3_GPTIMER_BASE` is not defined, we fallback to the old logic using the GPTIMER core index. Close #5258
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/* timer.c
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*
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* This file implements a benchmark timer using timer 2.
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*
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* COPYRIGHT (c) 1989-1998.
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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.org/license/LICENSE.
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*
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* Ported to LEON implementation of the SPARC by On-Line Applications
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* Research Corporation (OAR) under contract to the European Space
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* Agency (ESA).
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*
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* LEON modifications of respective RTEMS file: COPYRIGHT (c) 1995.
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* European Space Agency.
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*/
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#include <leon.h>
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#include <rtems/btimer.h>
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bool benchmark_timer_find_average_overhead;
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bool benchmark_timer_is_initialized = false;
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void benchmark_timer_initialize(void)
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{
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/*
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* Timer runs long and accurate enough not to require an interrupt.
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*/
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if (LEON3_Timer_Regs) {
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gptimer_timer *timer = &LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX];
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if ( benchmark_timer_is_initialized == false ) {
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/* approximately 1 us per countdown */
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grlib_store_32( &timer->trldval, 0xffffff );
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grlib_store_32( &timer->tcntval, 0xffffff );
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} else {
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benchmark_timer_is_initialized = true;
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}
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grlib_store_32( &timer->tctrl, GPTIMER_TCTRL_EN | GPTIMER_TCTRL_LD );
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}
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}
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#define AVG_OVERHEAD 3 /* It typically takes 3.0 microseconds */
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/* to start/stop the timer. */
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#define LEAST_VALID 2 /* Don't trust a value lower than this */
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benchmark_timer_t benchmark_timer_read(void)
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{
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uint32_t total;
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if (LEON3_Timer_Regs) {
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total =
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grlib_load_32( &LEON3_Timer_Regs->timer[LEON3_CLOCK_INDEX].tcntval );
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total = 0xffffff - total;
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if ( benchmark_timer_find_average_overhead == true )
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return total; /* in one microsecond units */
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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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return 0;
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}
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void benchmark_timer_disable_subtracting_average_overhead(
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bool find_flag
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)
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{
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benchmark_timer_find_average_overhead = find_flag;
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}
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