alexander | 3c79893 | 2021-03-26 21:42:19 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2021 Arm Limited. All rights reserved. |
| 3 | * SPDX-License-Identifier: Apache-2.0 |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | */ |
| 17 | #ifdef __cplusplus |
| 18 | extern "C" { |
| 19 | #endif |
| 20 | |
| 21 | #include "timer.h" |
| 22 | |
| 23 | #include <cassert> |
| 24 | #include <ctime> |
| 25 | #include <cstring> |
| 26 | |
| 27 | #define MILLISECONDS_IN_SECOND 1000 |
| 28 | #define MICROSECONDS_IN_SECOND 1000000 |
| 29 | #define NANOSECONDS_IN_MILLISECOND 1000000 |
| 30 | #define NANOSECONDS_IN_MICROSECOND 1000 |
| 31 | |
| 32 | /** |
| 33 | * @brief Gets the current time counter value. |
| 34 | * @return Counter value expressed in terms of time_counter struct. |
| 35 | **/ |
| 36 | static time_counter get_time_counter(void) |
| 37 | { |
| 38 | struct timespec current_time{}; |
| 39 | clock_gettime(1, ¤t_time); |
| 40 | time_counter t = { |
| 41 | .current_secs = current_time.tv_sec, |
| 42 | .current_nsecs = current_time.tv_nsec |
| 43 | }; |
| 44 | |
| 45 | return t; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * @brief Gets the time duration elapsed between start and end. |
| 50 | * @param[in] start Pointer to time_counter value at start time. |
| 51 | * @param[in] end Pointer to time_counter value at end. |
| 52 | * @return Difference in milliseconds between the arguments expressed |
| 53 | * as unsigned 32 bit integer. |
| 54 | **/ |
| 55 | static time_t get_duration_milliseconds(time_counter *start, time_counter *end) |
| 56 | { |
| 57 | /* Convert both parts of time struct to ms then add for complete time. */ |
| 58 | time_t seconds_part = |
| 59 | (end->current_secs - start->current_secs) * MILLISECONDS_IN_SECOND; |
| 60 | time_t nanoseconds_part = |
| 61 | (end->current_nsecs - start->current_nsecs) / NANOSECONDS_IN_MILLISECOND; |
| 62 | |
| 63 | return seconds_part + nanoseconds_part; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * @brief Gets the time duration elapsed between start and end. |
| 68 | * @param[in] start Pointer to time_counter value at start time. |
| 69 | * @param[in] end Pointer to time_counter value at end. |
| 70 | * @return Difference in microseconds between the arguments expressed |
| 71 | * as unsigned 32 bit integer. |
| 72 | **/ |
| 73 | static time_t get_duration_microseconds(time_counter *start, time_counter *end) |
| 74 | { |
| 75 | /* Convert both parts of time struct to us then add for complete time. */ |
| 76 | time_t seconds_part = |
| 77 | (end->current_secs - start->current_secs) * MICROSECONDS_IN_SECOND; |
| 78 | time_t nanoseconds_part = |
| 79 | (end->current_nsecs - start->current_nsecs) / NANOSECONDS_IN_MICROSECOND; |
| 80 | |
| 81 | return seconds_part + nanoseconds_part; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * @brief Stub for timer reset. |
| 86 | **/ |
| 87 | void reset_timer() {} |
| 88 | |
| 89 | /** |
| 90 | * @brief Initialise the timer for this platform. |
| 91 | **/ |
| 92 | void init_timer(platform_timer *timer) |
| 93 | { |
| 94 | assert(timer); |
| 95 | memset(timer, 0, sizeof(*timer)); |
| 96 | |
| 97 | timer->get_time_counter = get_time_counter; |
| 98 | timer->start_profiling = get_time_counter; |
| 99 | timer->stop_profiling = get_time_counter; |
| 100 | timer->get_duration_ms = get_duration_milliseconds; |
| 101 | timer->cap.duration_ms = 1; |
| 102 | timer->get_duration_us = get_duration_microseconds; |
| 103 | timer->cap.duration_us = 1; |
| 104 | timer->reset = reset_timer; |
| 105 | timer->inited = 1; |
| 106 | } |
| 107 | |
| 108 | #ifdef __cplusplus |
| 109 | } |
| 110 | #endif |