diff options
Diffstat (limited to 'arch/x86/kernel/rtc.c')
| -rw-r--r-- | arch/x86/kernel/rtc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c index d040840ff1b6..c42cf1263882 100644 --- a/arch/x86/kernel/rtc.c +++ b/arch/x86/kernel/rtc.c @@ -6,6 +6,7 @@ #include <linux/mc146818rtc.h> #include <asm/time.h> +#include <asm/vsyscall.h> #ifdef CONFIG_X86_32 # define CMOS_YEARS_OFFS 1900 @@ -194,3 +195,12 @@ int update_persistent_clock(struct timespec now) { return set_rtc_mmss(now.tv_sec); } + +unsigned long long __vsyscall_fn native_read_tsc(void) +{ + DECLARE_ARGS(val, low, high); + + asm volatile("rdtsc" : EAX_EDX_RET(val, low, high)); + return EAX_EDX_VAL(val, low, high); +} +EXPORT_SYMBOL_GPL(native_read_tsc); |
