1 files changed, 73 insertions, 0 deletions
diff --git a/arch/x86/include/asm/trace-clock.h b/arch/x86/include/asm/trace-clock.h
new file mode 100644
index 00000000000..8ca73323366
--- /dev/null
+++ b/arch/x86/include/asm/trace-clock.h
@@ -0,0 +1,73 @@
+#ifndef _ASM_X86_TRACE_CLOCK_H
+#define _ASM_X86_TRACE_CLOCK_H
+
+/*
+ * linux/arch/x86/include/asm/trace-clock.h
+ *
+ * Copyright (C) 2005,2006,2008
+ *   Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
+ *
+ * Trace clock definitions for x86.
+ */
+
+#include <linux/timex.h>
+#include <linux/time.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/atomic.h>
+
+/* Minimum duration of a probe, in cycles */
+#define TRACE_CLOCK_MIN_PROBE_DURATION 200
+#define TRACE_CLOCK_RES TRACE_CLOCK_MIN_PROBE_DURATION
+
+union lttng_timespec {
+	struct timespec ts;
+	u64 lttng_ts;
+};
+
+extern cycles_t trace_clock_async_tsc_read(void);
+
+extern int _trace_clock_is_sync;
+static inline int trace_clock_is_sync(void)
+{
+	return _trace_clock_is_sync;
+}
+
+static inline u32 trace_clock_read32(void)
+{
+	u32 cycles;
+
+	if (likely(trace_clock_is_sync()))
+		cycles = (u32)get_cycles(); /* only need the 32 LSB */
+	else
+		cycles = (u32)trace_clock_async_tsc_read();
+	return cycles;
+}
+
+static inline u64 trace_clock_read64(void)
+{
+	u64 cycles;
+
+	if (likely(trace_clock_is_sync()))
+		cycles = get_cycles();
+	else
+		cycles = trace_clock_async_tsc_read();
+	return cycles;
+}
+
+static inline u64 trace_clock_frequency(void)
+{
+	return (u64)cpu_khz * 1000;
+}
+
+static inline u32 trace_clock_freq_scale(void)
+{
+	return 1;
+}
+
+extern int get_trace_clock(void);
+extern void put_trace_clock(void);
+
+extern void set_trace_clock_is_sync(int state);
+
+#endif /* _ASM_X86_TRACE_CLOCK_H */