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doxygen will warn that documented return type is found for functions that does not return anything in 1.9.4 or later versions. 'None' is not a special keyword in doxyge, it will recognize it as description to the return value that does not exist in void functions. Tracked-On: #8425 Signed-off-by: Jiaqing Zhao <jiaqing.zhao@linux.intel.com> Reviewed-by: Junjie Mao <junjie.mao@intel.com>
48 lines
903 B
C
48 lines
903 B
C
/*
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* Copyright (C) 2021 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef ARCH_X86_TSC_H
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#define ARCH_X86_TSC_H
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#include <types.h>
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#define TSC_PER_MS ((uint64_t)get_tsc_khz())
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/**
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* @brief Read Time Stamp Counter (TSC).
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*
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* @return TSC value
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*/
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static inline uint64_t rdtsc(void)
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{
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uint32_t lo, hi;
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asm volatile("rdtsc" : "=a" (lo), "=d" (hi));
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return ((uint64_t)hi << 32U) | lo;
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}
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/**
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* @brief Get Time Stamp Counter (TSC) frequency in KHz.
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*
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* @return TSC frequency in KHz
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*/
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uint32_t get_tsc_khz(void);
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/**
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* @brief Calibrate Time Stamp Counter (TSC) frequency.
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*
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* @remark Generic time related routines, e.g., cpu_tickrate(), us_to_ticks(),
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* udelay(), etc., relies on this function being called earlier during system initialization.
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*/
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void calibrate_tsc(void);
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/**
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* @brief Initialize HPET.
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*/
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void hpet_init(void);
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#endif /* ARCH_X86_TSC_H */
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