path: root/arch/x86/kernel/tsc.c

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/sched/clock.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/timer.h>
#include <linux/acpi_pmtmr.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/clocksource.h>
#include <linux/percpu.h>
#include <linux/timex.h>
#include <linux/static_key.h>

#include <asm/hpet.h>
#include <asm/timer.h>
#include <asm/vgtod.h>
#include <asm/time.h>
#include <asm/delay.h>
#include <asm/hypervisor.h>
#include <asm/nmi.h>
#include <asm/x86_init.h>
#include <asm/geode.h>
#include <asm/apic.h>
#include <asm/intel-family.h>
#include <asm/i8259.h>
#include <asm/uv/uv.h>

unsigned int __read_mostly cpu_khz;	/* TSC clocks / usec, not used here */
EXPORT_SYMBOL(cpu_khz);

unsigned int __read_mostly tsc_khz;
EXPORT_SYMBOL(tsc_khz);

#define KHZ	1000

/*
 * TSC can be unstable due to cpufreq or due to unsynced TSCs
 */
static int __read_mostly tsc_unstable;

static DEFINE_STATIC_KEY_FALSE(__use_tsc);

int tsc_clocksource_reliable;

static u32 art_to_tsc_numerator;
static u32 art_to_tsc_denominator;
static u64 art_to_tsc_off