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/*
* Copyright (c) 2014, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* liABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <arm_sys_counter.h>
#define WORD_SIZE 32
uint64_t arm_sys_counter_get_counter(void)
{
uint64_t val;
#ifdef __aarch64__
asm volatile("mrs %0, cntvct_el0" : "=r"(val));
#else
uint32_t cntvct_low, cntvct_high;
__asm__ volatile("mrrc p15, 1, %0, %1, c14"
: "=r"(cntvct_low), "=r"(cntvct_high));
val = cntvct_low | ((uint64_t)cntvct_high << WORD_SIZE);
#endif
return val;
}
uint32_t arm_sys_counter_get_frequency(void)
{
uint32_t frq;
#ifdef __aarch64__
asm volatile("mrs %0, cntfrq_el0" : "=r"(frq));
#else
asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r"(frq));
#endif
return frq;
}
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