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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/asm-x86_64/timex.h
2 * linux/include/asm-x86_64/timex.h
4 * x86-64 architecture timex specifications
6 #ifndef _ASMx8664_TIMEX_H
7 #define _ASMx8664_TIMEX_H
9 #include <asm/8253pit.h>
11 #include <asm/vsyscall.h>
13 #include <asm/system.h>
14 #include <asm/processor.h>
15 #include <linux/compiler.h>
17 #define CLOCK_TICK_RATE PIT_TICK_RATE /* Underlying HZ */
19 typedef unsigned long long cycles_t
;
21 static inline cycles_t
get_cycles (void)
23 unsigned long long ret
;
29 /* Like get_cycles, but make sure the CPU is synchronized. */
30 static __always_inline cycles_t
get_cycles_sync(void)
32 unsigned long long ret
;
34 /* Don't do an additional sync on CPUs where we know
35 RDTSC is already synchronous. */
36 alternative_io("cpuid", ASM_NOP2
, X86_FEATURE_SYNC_RDTSC
,
37 "=a" (eax
), "0" (1) : "ebx","ecx","edx","memory");
42 extern unsigned int cpu_khz
;
44 extern int read_current_timer(unsigned long *timer_value
);
45 #define ARCH_HAS_READ_CURRENT_TIMER 1
47 extern struct vxtime_data vxtime
;