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+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * version: DPDK.L.1.2.3-3
+ */
+
+#ifndef _RTE_CYCLES_H_
+#define _RTE_CYCLES_H_
+
+/**
+ * @file
+ *
+ * Simple Time Reference Functions (Cycles and HPET).
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+/**
+ * Read the TSC register.
+ *
+ * @return
+ * The TSC for this lcore.
+ */
+static inline uint64_t
+rte_rdtsc(void)
+{
+ union {
+ uint64_t tsc_64;
+ struct {
+ uint32_t lo_32;
+ uint32_t hi_32;
+ };
+ } tsc;
+
+ asm volatile("rdtsc" :
+ "=a" (tsc.lo_32),
+ "=d" (tsc.hi_32));
+ return tsc.tsc_64;
+}
+
+/**
+ * Return the number of HPET cycles since boot
+ *
+ * This counter is global for all execution units. The number of
+ * cycles in one second can be retrived using rte_get_hpet_hz().
+ *
+ * @return
+ * the number of cycles
+ */
+uint64_t
+rte_get_hpet_cycles(void);
+
+/**
+ * Get the number of cycles in one second.
+ *
+ * @return
+ * The number of cycles in one second.
+ */
+uint64_t
+rte_get_hpet_hz(void);
+
+/**
+ * Wait at least us microseconds.
+ *
+ * @param us
+ * The number of microseconds to wait.
+ */
+void
+rte_delay_us(unsigned us);
+
+/**
+ * Wait at least ms milliseconds.
+ *
+ * @param ms
+ * The number of milliseconds to wait.
+ */
+static inline void
+rte_delay_ms(unsigned ms)
+{
+ rte_delay_us(ms * 1000);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_CYCLES_H_ */