forked from Imagelibrary/rtems
109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/*
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* Copyright (c) 2015 University of York.
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* Hesham ALMatary <hmka501@york.ac.uk>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <rtems.h>
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#include <bsp.h>
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#include <rtems/btimer.h>
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#include <rtems/score/epiphany-utility.h>
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extern char bsp_start_vector_table_begin[];
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bool benchmark_timer_find_average_overhead;
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static void benchmark_timer1_interrupt_handler(void)
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{
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unsigned int val = 0xFFFFFFFF;
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unsigned int event_type = 0x1;
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/* Embed assembly code for setting timer1 */
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__asm__ __volatile__ ("movts ctimer1, %[val] \t \n" :: [val] "r" (val));
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__asm__ __volatile__ ("movfs r16, config; \t \n"
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"mov r17, %%low(0xfffff0ff);\t \n"
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"movt r17, %%high(0xffff0ff);\t \n"
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"lsl r18, %[event_type], 0x8; \t \n"
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"and r16, r16, r17; \t \n"
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"orr r16, r16, r18; \t \n"
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"movts config, r16; \t \n"
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:: [event_type] "r" (event_type));
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}
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/* Start eCore tiemr 1 usef for profiling and timing analysis */
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void benchmark_timer_initialize( void )
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{
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/* Install interrupt handler for timer 1 */
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void (**table)(void) = (void (**)(void)) bsp_start_vector_table_begin;
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table[TIMER1] = benchmark_timer1_interrupt_handler;
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benchmark_timer1_interrupt_handler();
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}
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/*
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* The following controls the behavior of benchmark_timer_read().
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*
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* AVG_OVEREHAD is the overhead for starting and stopping the timer. It
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* is usually deducted from the number returned.
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*
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* LEAST_VALID is the lowest number this routine should trust. Numbers
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* below this are "noise" and zero is returned.
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*/
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#define AVG_OVERHEAD 0 /* It typically takes X.X microseconds */
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/* (Y countdowns) to start/stop the timer. */
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/* This value is in microseconds. */
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#define LEAST_VALID 1 /* Don't trust a clicks 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 timer_val = 0;
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uint32_t total;
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__asm__ __volatile__ ("movfs %[timer_val], ctimer1 \t \n"
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:[timer_val] "=r" (timer_val):);
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total = (0xFFFFFFFF - timer_val);
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if ( benchmark_timer_find_average_overhead == true )
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return total;
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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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/*
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* Somehow convert total into microseconds
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*/
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return (total - AVG_OVERHEAD);
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}
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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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