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61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/* arm_features.c -- ARM processor features detection.
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*
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* Copyright 2018 The Chromium Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the Chromium source repository LICENSE file.
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*/
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#include "arm_features.h"
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#include "zutil.h"
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#include <pthread.h>
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#include <stdint.h>
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#if defined(ARMV8_OS_ANDROID)
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#include <cpu-features.h>
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#elif defined(ARMV8_OS_LINUX)
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#include <asm/hwcap.h>
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#include <sys/auxv.h>
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#else
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#error ### No ARM CPU features detection in your platform/OS
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#endif
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int ZLIB_INTERNAL arm_cpu_enable_crc32 = 0;
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int ZLIB_INTERNAL arm_cpu_enable_pmull = 0;
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static pthread_once_t cpu_check_inited_once = PTHREAD_ONCE_INIT;
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static void init_arm_features(void)
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{
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uint64_t flag_crc32 = 0, flag_pmull = 0, capabilities = 0;
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#if defined(ARMV8_OS_ANDROID)
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flag_crc32 = ANDROID_CPU_ARM_FEATURE_CRC32;
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flag_pmull = ANDROID_CPU_ARM_FEATURE_PMULL;
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capabilities = android_getCpuFeatures();
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#elif defined(ARMV8_OS_LINUX)
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#if defined(__aarch64__)
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flag_crc32 = HWCAP_CRC32;
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flag_pmull = HWCAP_PMULL;
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capabilities = getauxval(AT_HWCAP);
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#elif defined(__ARM_NEON) || defined(__ARM_NEON__)
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/* The use of HWCAP2 is for getting features of newer ARMv8-A SoCs
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* while running in 32bits mode (i.e. aarch32).
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*/
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flag_crc32 = HWCAP2_CRC32;
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flag_pmull = HWCAP2_PMULL;
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capabilities = getauxval(AT_HWCAP2);
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#endif
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#endif
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if (capabilities & flag_crc32)
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arm_cpu_enable_crc32 = 1;
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if (capabilities & flag_pmull)
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arm_cpu_enable_pmull = 1;
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}
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void ZLIB_INTERNAL arm_check_features(void)
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{
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pthread_once(&cpu_check_inited_once, init_arm_features);
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}
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