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/* * linux/include/asm-x86_64/timex.h * * x86-64 architecture timex specifications */ #ifndef _ASMx8664_TIMEX_H #define _ASMx8664_TIMEX_H #include <asm/8253pit.h> #include <asm/msr.h> #include <asm/vsyscall.h> #include <asm/hpet.h> #include <asm/system.h> #include <asm/processor.h> #include <linux/compiler.h> #define CLOCK_TICK_RATE PIT_TICK_RATE /* Underlying HZ */ typedef unsigned long long cycles_t; static inline cycles_t get_cycles (void) { unsigned long long ret; rdtscll(ret); return ret; } /* Like get_cycles, but make sure the CPU is synchronized. */ static __always_inline cycles_t get_cycles_sync(void) { unsigned long long ret; unsigned eax; /* Don't do an additional sync on CPUs where we know RDTSC is already synchronous. */ alternative_io(ASM_NOP2, "cpuid", X86_FEATURE_SYNC_RDTSC, "=a" (eax), "0" (1) : "ebx","ecx","edx","memory"); rdtscll(ret); return ret; } extern unsigned int cpu_khz; extern int read_current_timer(unsigned long *timer_value); #define ARCH_HAS_READ_CURRENT_TIMER 1 extern struct vxtime_data vxtime; #endif