mirror of https://github.com/nodejs/node.git
91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
/* 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 <stdint.h>
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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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#if defined(ARMV8_OS_ANDROID) || defined(ARMV8_OS_LINUX) || defined(ARMV8_OS_FUCHSIA)
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#include <pthread.h>
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#endif
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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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#elif defined(ARMV8_OS_FUCHSIA)
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#include <zircon/features.h>
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#include <zircon/syscalls.h>
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#include <zircon/types.h>
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#elif defined(ARMV8_OS_WINDOWS)
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#include <windows.h>
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#else
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#error arm_features.c ARM feature detection in not defined for your platform
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#endif
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static void _arm_check_features(void);
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#if defined(ARMV8_OS_ANDROID) || defined(ARMV8_OS_LINUX) || defined(ARMV8_OS_FUCHSIA)
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static pthread_once_t cpu_check_inited_once = PTHREAD_ONCE_INIT;
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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, _arm_check_features);
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}
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#elif defined(ARMV8_OS_WINDOWS)
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static INIT_ONCE cpu_check_inited_once = INIT_ONCE_STATIC_INIT;
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static BOOL CALLBACK _arm_check_features_forwarder(PINIT_ONCE once, PVOID param, PVOID* context)
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{
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_arm_check_features();
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return TRUE;
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}
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void ZLIB_INTERNAL arm_check_features(void)
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{
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InitOnceExecuteOnce(&cpu_check_inited_once, _arm_check_features_forwarder,
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NULL, NULL);
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}
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#endif
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/*
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* See http://bit.ly/2CcoEsr for run-time detection of ARM features and also
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* crbug.com/931275 for android_getCpuFeatures() use in the Android sandbox.
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*/
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static void _arm_check_features(void)
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{
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#if defined(ARMV8_OS_ANDROID) && defined(__aarch64__)
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uint64_t features = android_getCpuFeatures();
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arm_cpu_enable_crc32 = !!(features & ANDROID_CPU_ARM64_FEATURE_CRC32);
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arm_cpu_enable_pmull = !!(features & ANDROID_CPU_ARM64_FEATURE_PMULL);
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#elif defined(ARMV8_OS_ANDROID) /* aarch32 */
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uint64_t features = android_getCpuFeatures();
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arm_cpu_enable_crc32 = !!(features & ANDROID_CPU_ARM_FEATURE_CRC32);
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arm_cpu_enable_pmull = !!(features & ANDROID_CPU_ARM_FEATURE_PMULL);
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#elif defined(ARMV8_OS_LINUX) && defined(__aarch64__)
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unsigned long features = getauxval(AT_HWCAP);
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arm_cpu_enable_crc32 = !!(features & HWCAP_CRC32);
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arm_cpu_enable_pmull = !!(features & HWCAP_PMULL);
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#elif defined(ARMV8_OS_LINUX) && (defined(__ARM_NEON) || defined(__ARM_NEON__))
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/* Query HWCAP2 for ARMV8-A SoCs running in aarch32 mode */
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unsigned long features = getauxval(AT_HWCAP2);
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arm_cpu_enable_crc32 = !!(features & HWCAP2_CRC32);
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arm_cpu_enable_pmull = !!(features & HWCAP2_PMULL);
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#elif defined(ARMV8_OS_FUCHSIA)
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uint32_t features;
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zx_status_t rc = zx_system_get_features(ZX_FEATURE_KIND_CPU, &features);
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if (rc != ZX_OK || (features & ZX_ARM64_FEATURE_ISA_ASIMD) == 0)
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return; /* Report nothing if ASIMD(NEON) is missing */
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arm_cpu_enable_crc32 = !!(features & ZX_ARM64_FEATURE_ISA_CRC32);
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arm_cpu_enable_pmull = !!(features & ZX_ARM64_FEATURE_ISA_PMULL);
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#elif defined(ARMV8_OS_WINDOWS)
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arm_cpu_enable_crc32 = IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE);
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arm_cpu_enable_pmull = IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE);
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#endif
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}
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