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/*
* Copyright (c) 2021 Arm Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "timer.h"
#include <assert.h>
#include <time.h>
#include <string.h>
#define MILLISECONDS_IN_SECOND 1000
#define MICROSECONDS_IN_SECOND 1000000
#define NANOSECONDS_IN_MILLISECOND 1000000
#define NANOSECONDS_IN_MICROSECOND 1000
/**
* @brief Gets the current time counter value.
* @return Counter value expressed in terms of time_counter struct.
**/
static time_counter get_time_counter(void)
{
struct timespec current_time;
clock_gettime(1, ¤t_time);
time_counter t = {
.current_secs = current_time.tv_sec,
.current_nsecs = current_time.tv_nsec
};
return t;
}
/**
* @brief Gets the time duration elapsed between start and end.
* @param[in] start Pointer to time_counter value at start time.
* @param[in] end Pointer to time_counter value at end.
* @return Difference in milliseconds between the arguments expressed
* as unsigned 32 bit integer.
**/
static time_t get_duration_milliseconds(time_counter *start, time_counter *end)
{
/* Convert both parts of time struct to ms then add for complete time. */
time_t seconds_part =
(end->current_secs - start->current_secs) * MILLISECONDS_IN_SECOND;
time_t nanoseconds_part =
(end->current_nsecs - start->current_nsecs) / NANOSECONDS_IN_MILLISECOND;
return seconds_part + nanoseconds_part;
}
/**
* @brief Gets the time duration elapsed between start and end.
* @param[in] start Pointer to time_counter value at start time.
* @param[in] end Pointer to time_counter value at end.
* @return Difference in microseconds between the arguments expressed
* as unsigned 32 bit integer.
**/
static time_t get_duration_microseconds(time_counter *start, time_counter *end)
{
/* Convert both parts of time struct to us then add for complete time. */
time_t seconds_part =
(end->current_secs - start->current_secs) * MICROSECONDS_IN_SECOND;
time_t nanoseconds_part =
(end->current_nsecs - start->current_nsecs) / NANOSECONDS_IN_MICROSECOND;
return seconds_part + nanoseconds_part;
}
/**
* @brief Stub for timer reset.
**/
void reset_timer() {}
/**
* @brief Initialise the timer for this platform.
**/
void init_timer(platform_timer *timer)
{
assert(timer);
memset(timer, 0, sizeof(*timer));
timer->get_time_counter = get_time_counter;
timer->start_profiling = get_time_counter;
timer->stop_profiling = get_time_counter;
timer->get_duration_ms = get_duration_milliseconds;
timer->cap.duration_ms = 1;
timer->get_duration_us = get_duration_microseconds;
timer->cap.duration_us = 1;
timer->reset = reset_timer;
timer->inited = 1;
}
#ifdef __cplusplus
}
#endif
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