43 lines
807 B
C
43 lines
807 B
C
/*
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* Copyright (c) 2017 Synopsys, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Time Stamp API for ARCv2
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*
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* Provide 64-bit time stamp API
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*/
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#include <kernel.h>
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#include <toolchain.h>
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#include <kernel_structs.h>
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extern int64_t _sys_clock_tick_count;
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extern int sys_clock_hw_cycles_per_tick;
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/*
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* @brief Read 64-bit timestamp value
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*
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* This function returns a 64-bit bit time stamp value that is clocked
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* at the same frequency as the CPU.
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*
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* @return 64-bit time stamp value
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*/
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uint64_t _tsc_read(void)
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{
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unsigned int key;
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uint64_t t;
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uint32_t count;
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key = irq_lock();
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t = (uint64_t)_sys_clock_tick_count;
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count = _arc_v2_aux_reg_read(_ARC_V2_TMR0_COUNT);
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irq_unlock(key);
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t *= (uint64_t)sys_clock_hw_cycles_per_tick;
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t += (uint64_t)count;
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return t;
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}
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