mirror of https://github.com/F-Stack/f-stack.git
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2014 Intel Corporation
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*/
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#ifndef _RTE_CPUFLAGS_H_
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#define _RTE_CPUFLAGS_H_
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/**
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* @file
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* Architecture specific API to determine available CPU features at runtime.
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*/
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#include "rte_common.h"
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#include <errno.h>
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#include <rte_compat.h>
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/**
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* Structure used to describe platform-specific intrinsics that may or may not
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* be supported at runtime.
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*/
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struct rte_cpu_intrinsics {
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uint32_t power_monitor : 1;
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/**< indicates support for rte_power_monitor function */
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uint32_t power_pause : 1;
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/**< indicates support for rte_power_pause function */
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uint32_t power_monitor_multi : 1;
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/**< indicates support for rte_power_monitor_multi function */
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};
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/**
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* @warning
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* @b EXPERIMENTAL: this API may change without prior notice
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*
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* Check CPU support for various intrinsics at runtime.
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*
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* @param intrinsics
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* Pointer to a structure to be filled.
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*/
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__rte_experimental
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void
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rte_cpu_get_intrinsics_support(struct rte_cpu_intrinsics *intrinsics);
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/**
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* Enumeration of all CPU features supported
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*/
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__extension__
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enum rte_cpu_flag_t;
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/**
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* Get name of CPU flag
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*
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* @param feature
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* CPU flag ID
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* @return
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* flag name
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* NULL if flag ID is invalid
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*/
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__extension__
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const char *
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rte_cpu_get_flag_name(enum rte_cpu_flag_t feature);
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/**
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* Function for checking a CPU flag availability
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*
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* @param feature
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* CPU flag to query CPU for
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* @return
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* 1 if flag is available
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* 0 if flag is not available
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* -ENOENT if flag is invalid
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*/
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__extension__
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int
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rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature);
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/**
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* This function checks that the currently used CPU supports the CPU features
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* that were specified at compile time. It is called automatically within the
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* EAL, so does not need to be used by applications. This version returns a
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* result so that decisions may be made (for instance, graceful shutdowns).
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*/
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int
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rte_cpu_is_supported(void);
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/**
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* This function attempts to retrieve a value from the auxiliary vector.
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* If it is unsuccessful, the result will be 0, and errno will be set.
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*
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* @return A value from the auxiliary vector. When the value is 0, check
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* errno to determine if an error occurred.
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*/
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unsigned long
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rte_cpu_getauxval(unsigned long type);
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/**
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* This function retrieves a value from the auxiliary vector, and compares it
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* as a string against the value retrieved.
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*
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* @return The result of calling strcmp() against the value retrieved from
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* the auxiliary vector. When the value is 0 (meaning a match is found),
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* check errno to determine if an error occurred.
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*/
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int
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rte_cpu_strcmp_auxval(unsigned long type, const char *str);
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#endif /* _RTE_CPUFLAGS_H_ */
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