blob: f5641c39bbce976700655f5624102891d8e73ea9 [file] [log] [blame]
/* arm_features.c -- ARM processor features detection.
*
* Copyright 2018 The Chromium Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the Chromium source repository LICENSE file.
*/
#include "arm_features.h"
#include "zutil.h"
#include <stdint.h>
int ZLIB_INTERNAL arm_cpu_enable_crc32 = 0;
int ZLIB_INTERNAL arm_cpu_enable_pmull = 0;
#if defined(ARMV8_OS_ANDROID) || defined(ARMV8_OS_LINUX) || defined(ARMV8_OS_FUCHSIA)
#include <pthread.h>
#endif
#if defined(ARMV8_OS_ANDROID)
#include <cpu-features.h>
#elif defined(ARMV8_OS_LINUX)
#include <asm/hwcap.h>
#include <sys/auxv.h>
#elif defined(ARMV8_OS_FUCHSIA)
#include <zircon/features.h>
#include <zircon/syscalls.h>
#include <zircon/types.h>
#elif defined(ARMV8_OS_WINDOWS)
#include <windows.h>
#else
#error arm_features.c ARM feature detection in not defined for your platform
#endif
static void _arm_check_features(void);
#if defined(ARMV8_OS_ANDROID) || defined(ARMV8_OS_LINUX) || defined(ARMV8_OS_FUCHSIA)
static pthread_once_t cpu_check_inited_once = PTHREAD_ONCE_INIT;
void ZLIB_INTERNAL arm_check_features(void)
{
pthread_once(&cpu_check_inited_once, _arm_check_features);
}
#elif defined(ARMV8_OS_WINDOWS)
static INIT_ONCE cpu_check_inited_once = INIT_ONCE_STATIC_INIT;
static BOOL CALLBACK _arm_check_features_forwarder(PINIT_ONCE once, PVOID param, PVOID* context)
{
_arm_check_features();
return TRUE;
}
void ZLIB_INTERNAL arm_check_features(void)
{
InitOnceExecuteOnce(&cpu_check_inited_once, _arm_check_features_forwarder,
NULL, NULL);
}
#endif
/*
* See http://bit.ly/2CcoEsr for run-time detection of ARM features and also
* crbug.com/931275 for android_getCpuFeatures() use in the Android sandbox.
*/
static void _arm_check_features(void)
{
#if defined(ARMV8_OS_ANDROID) && defined(__aarch64__)
uint64_t features = android_getCpuFeatures();
arm_cpu_enable_crc32 = !!(features & ANDROID_CPU_ARM64_FEATURE_CRC32);
arm_cpu_enable_pmull = !!(features & ANDROID_CPU_ARM64_FEATURE_PMULL);
#elif defined(ARMV8_OS_ANDROID) /* aarch32 */
uint64_t features = android_getCpuFeatures();
arm_cpu_enable_crc32 = !!(features & ANDROID_CPU_ARM_FEATURE_CRC32);
arm_cpu_enable_pmull = !!(features & ANDROID_CPU_ARM_FEATURE_PMULL);
#elif defined(ARMV8_OS_LINUX) && defined(__aarch64__)
unsigned long features = getauxval(AT_HWCAP);
arm_cpu_enable_crc32 = !!(features & HWCAP_CRC32);
arm_cpu_enable_pmull = !!(features & HWCAP_PMULL);
#elif defined(ARMV8_OS_LINUX) && (defined(__ARM_NEON) || defined(__ARM_NEON__))
/* Query HWCAP2 for ARMV8-A SoCs running in aarch32 mode */
unsigned long features = getauxval(AT_HWCAP2);
arm_cpu_enable_crc32 = !!(features & HWCAP2_CRC32);
arm_cpu_enable_pmull = !!(features & HWCAP2_PMULL);
#elif defined(ARMV8_OS_FUCHSIA)
uint32_t features;
zx_status_t rc = zx_system_get_features(ZX_FEATURE_KIND_CPU, &features);
if (rc != ZX_OK || (features & ZX_ARM64_FEATURE_ISA_ASIMD) == 0)
return; /* Report nothing if ASIMD(NEON) is missing */
arm_cpu_enable_crc32 = !!(features & ZX_ARM64_FEATURE_ISA_CRC32);
arm_cpu_enable_pmull = !!(features & ZX_ARM64_FEATURE_ISA_PMULL);
#elif defined(ARMV8_OS_WINDOWS)
arm_cpu_enable_crc32 = IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE);
arm_cpu_enable_pmull = IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE);
#endif
}