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/*-
* 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,
* 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_CPUFLAGS_H_
#define _RTE_CPUFLAGS_H_
/**
* @file
* Architecture specific API to determine available CPU features at runtime.
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <stdint.h>
/**
* Enumeration of all CPU features supported
*/
enum rte_cpu_flag_t;
/**
* Enumeration of CPU registers
*/
enum cpu_register_t;
typedef uint32_t cpuid_registers_t[4];
#define CPU_FLAG_NAME_MAX_LEN 64
/**
* Struct to hold a processor feature entry
*/
struct feature_entry {
uint32_t leaf; /**< cpuid leaf */
uint32_t subleaf; /**< cpuid subleaf */
uint32_t reg; /**< cpuid register */
uint32_t bit; /**< cpuid register bit */
char name[CPU_FLAG_NAME_MAX_LEN]; /**< String for printing */
};
#define FEAT_DEF(name, leaf, subleaf, reg, bit) \
[RTE_CPUFLAG_##name] = {leaf, subleaf, reg, bit, #name },
/**
* An array that holds feature entries
*/
static const struct feature_entry cpu_feature_table[];
/**
* Execute CPUID instruction and get contents of a specific register
*
* This function, when compiled with GCC, will generate architecture-neutral
* code, as per GCC manual.
*/
static inline void
rte_cpu_get_features(uint32_t leaf, uint32_t subleaf, cpuid_registers_t out);
/**
* Function for checking a CPU flag availability
*
* @param flag
* CPU flag to query CPU for
* @return
* 1 if flag is available
* 0 if flag is not available
* -ENOENT if flag is invalid
*/
static inline 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.
*/
void
rte_cpu_check_supported(void);
#endif /* _RTE_CPUFLAGS_H_ */
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