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https://github.com/Atmosphere-NX/Atmosphere.git
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47 lines
1 KiB
C
47 lines
1 KiB
C
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/**
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* @file counter.h
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* @brief AArch64 system counter-timer.
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* @author fincs
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* @copyright libnx Authors
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*/
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#pragma once
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#include "../utils/types.h"
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/**
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* @brief Gets the current system tick.
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* @return The current system tick.
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*/
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static inline u64 armGetSystemTick(void) {
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u64 ret;
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__asm__ __volatile__ ("mrs %x[data], cntpct_el0" : [data] "=r" (ret));
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return ret;
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}
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/**
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* @brief Gets the system counter-timer frequency
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* @return The system counter-timer frequency, in Hz.
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*/
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static inline u64 armGetSystemTickFreq(void) {
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u64 ret;
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__asm__ ("mrs %x[data], cntfrq_el0" : [data] "=r" (ret));
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return ret;
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}
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/**
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* @brief Converts from nanoseconds to CPU ticks unit.
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* @param ns Time in nanoseconds.
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* @return Time in CPU ticks.
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*/
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static inline u64 armNsToTicks(u64 ns) {
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return (ns * 12) / 625;
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}
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/**
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* @brief Converts from CPU ticks unit to nanoseconds.
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* @param tick Time in ticks.
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* @return Time in nanoseconds.
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*/
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static inline u64 armTicksToNs(u64 tick) {
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return (tick * 625) / 12;
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}
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