linux/arch/x86/include/asm/clocksource.h

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/* x86-specific clocksource additions */
#ifndef _ASM_X86_CLOCKSOURCE_H
#define _ASM_X86_CLOCKSOURCE_H
#ifdef CONFIG_X86_64
#define VCLOCK_NONE 0 /* No vDSO clock available. */
#define VCLOCK_TSC 1 /* vDSO should use vread_tsc. */
#define VCLOCK_HPET 2 /* vDSO should use vread_hpet. */
struct arch_clocksource_data {
int vclock_mode;
};
#endif /* CONFIG_X86_64 */
#endif /* _ASM_X86_CLOCKSOURCE_H */