/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   Copyright(c) 2013 6WIND.
 *   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.
 */

#ifndef _RTE_CYCLES_X86_64_H_
#define _RTE_CYCLES_X86_64_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "generic/rte_cycles.h"

#ifdef RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT
/* Global switch to use VMWARE mapping of TSC instead of RDTSC */
extern int rte_cycles_vmware_tsc_map;
#include <rte_branch_prediction.h>
#endif
#include <rte_common.h>
#include <rte_config.h>

static inline uint64_t
rte_rdtsc(void)
{
	union {
		uint64_t tsc_64;
		RTE_STD_C11
		struct {
			uint32_t lo_32;
			uint32_t hi_32;
		};
	} tsc;

#ifdef RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT
	if (unlikely(rte_cycles_vmware_tsc_map)) {
		/* ecx = 0x10000 corresponds to the physical TSC for VMware */
		asm volatile("rdpmc" :
		             "=a" (tsc.lo_32),
		             "=d" (tsc.hi_32) :
		             "c"(0x10000));
		return tsc.tsc_64;
	}
#endif

	asm volatile("rdtsc" :
		     "=a" (tsc.lo_32),
		     "=d" (tsc.hi_32));
	return tsc.tsc_64;
}

static inline uint64_t
rte_rdtsc_precise(void)
{
	rte_mb();
	return rte_rdtsc();
}

static inline uint64_t
rte_get_tsc_cycles(void) { return rte_rdtsc(); }

#ifdef __cplusplus
}
#endif

#endif /* _RTE_CYCLES_X86_64_H_ */
