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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#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);
/**
* This function attempts to retrieve a value from the auxiliary vector.
* If it is unsuccessful, the result will be 0, and errno will be set.
*
* @return A value from the auxiliary vector. When the value is 0, check
* errno to determine if an error occurred.
*/
unsigned long
rte_cpu_getauxval(unsigned long type);
/**
* This function retrieves a value from the auxiliary vector, and compares it
* as a string against the value retrieved.
*
* @return The result of calling strcmp() against the value retrieved from
* the auxiliary vector. When the value is 0 (meaning a match is found),
* check errno to determine if an error occurred.
*/
int
rte_cpu_strcmp_auxval(unsigned long type, const char *str);
#endif /* _RTE_CPUFLAGS_H_ */
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