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NJU-ProjectN/nemu eb63cf3568dbf4e0c3c6ef462e6ec685550fabbc Merge pull request #76 from rijuyuezhu/master
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xinyangli 2023-12-21 00:20:36 +08:00
parent 1efe03efb9
commit 2824efad33
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nemu/src/utils/timer.c Normal file
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/***************************************************************************************
* Copyright (c) 2014-2022 Zihao Yu, Nanjing University
*
* NEMU is licensed under Mulan PSL v2.
* You can use this software according to the terms and conditions of the Mulan PSL v2.
* You may obtain a copy of Mulan PSL v2 at:
* http://license.coscl.org.cn/MulanPSL2
*
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
*
* See the Mulan PSL v2 for more details.
***************************************************************************************/
#include <common.h>
#include MUXDEF(CONFIG_TIMER_GETTIMEOFDAY, <sys/time.h>, <time.h>)
IFDEF(CONFIG_TIMER_CLOCK_GETTIME,
static_assert(CLOCKS_PER_SEC == 1000000, "CLOCKS_PER_SEC != 1000000"));
IFDEF(CONFIG_TIMER_CLOCK_GETTIME,
static_assert(sizeof(clock_t) == 8, "sizeof(clock_t) != 8"));
static uint64_t boot_time = 0;
static uint64_t get_time_internal() {
#if defined(CONFIG_TARGET_AM)
uint64_t us = io_read(AM_TIMER_UPTIME).us;
#elif defined(CONFIG_TIMER_GETTIMEOFDAY)
struct timeval now;
gettimeofday(&now, NULL);
uint64_t us = now.tv_sec * 1000000 + now.tv_usec;
#else
struct timespec now;
clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
uint64_t us = now.tv_sec * 1000000 + now.tv_nsec / 1000;
#endif
return us;
}
uint64_t get_time() {
if (boot_time == 0) boot_time = get_time_internal();
uint64_t now = get_time_internal();
return now - boot_time;
}
void init_rand() {
srand(get_time_internal());
}