/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 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,
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 *   (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_CPUFLAGS_H_
#define _RTE_CPUFLAGS_H_

/**
 * @file
 * Architecture specific API to determine available CPU features at runtime.
 */

#include "rte_common.h"
#include <errno.h>

/**
 * Enumeration of all CPU features supported
 */
__extension__
enum rte_cpu_flag_t;

/**
 * Get name of CPU flag
 *
 * @param feature
 *     CPU flag ID
 * @return
 *     flag name
 *     NULL if flag ID is invalid
 */
__extension__
const char *
rte_cpu_get_flag_name(enum rte_cpu_flag_t feature);

/**
 * Function for checking a CPU flag availability
 *
 * @param feature
 *     CPU flag to query CPU for
 * @return
 *     1 if flag is available
 *     0 if flag is not available
 *     -ENOENT if flag is invalid
 */
__extension__
int
rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature);

/**
 * This function checks that the currently used CPU supports the CPU features
 * that were specified at compile time. It is called automatically within the
 * EAL, so does not need to be used by applications.
 */
__rte_deprecated
void
rte_cpu_check_supported(void);

/**
 * This function checks that the currently used CPU supports the CPU features
 * that were specified at compile time. It is called automatically within the
 * EAL, so does not need to be used by applications.  This version returns a
 * result so that decisions may be made (for instance, graceful shutdowns).
 */
int
rte_cpu_is_supported(void);

#endif /* _RTE_CPUFLAGS_H_ */