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/* Copyright (c) 2015, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <odp_posix_extensions.h>
#include <stdlib.h>
#include <time.h>
#include <odp/api/cpu.h>
#include <odp/api/hints.h>
#include <odp/api/system_info.h>
#include <odp_debug_internal.h>
#include <odp_time_internal.h>
#define GIGA 1000000000
uint64_t odp_cpu_cycles(void)
{
struct timespec time;
uint64_t sec, ns, hz, cycles;
int ret;
ret = clock_gettime(CLOCK_MONOTONIC_RAW, &time);
if (ret != 0)
ODP_ABORT("clock_gettime failed\n");
hz = odp_cpu_hz_max();
sec = (uint64_t)time.tv_sec;
ns = (uint64_t)time.tv_nsec;
cycles = sec * hz;
cycles += (ns * hz) / GIGA;
return cycles;
}
uint64_t odp_cpu_cycles_max(void)
{
return UINT64_MAX;
}
uint64_t odp_cpu_cycles_resolution(void)
{
return 1;
}
int cpu_has_global_time(void)
{
uint64_t hz = cpu_global_time_freq();
/*
* The system counter portion of the architected timer must
* provide a uniform view of system time to all processing
* elements in the system. This should hold true even for
* heterogeneous SoCs.
*
* Determine whether the system has 'global time' by checking
* whether a read of the architected timer frequency sys reg
* returns a sane value. Sane is considered to be within
* 1MHz and 6GHz (1us and .1667ns period).
*/
return hz >= 1000000 && hz <= 6000000000;
}
uint64_t cpu_global_time(void)
{
#ifdef __aarch64__
uint64_t cntvct;
/*
* To be consistent with other architectures, do not issue a
* serializing instruction, e.g. ISB, before reading this
* sys reg.
*/
/* Memory clobber to minimize optimization around load from sys reg. */
__asm__ volatile("mrs %0, cntvct_el0" : "=r"(cntvct) : : "memory");
return cntvct;
#else
return 0;
#endif
}
uint64_t cpu_global_time_freq(void)
{
#ifdef __aarch64__
uint64_t cntfrq;
__asm__ volatile("mrs %0, cntfrq_el0" : "=r"(cntfrq) : : );
return cntfrq;
#else
return 0;
#endif
}
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