1 /* cpu_features.c -- Processor features detection.
43 #include <cpu-features.h>
48 #include <zircon/features.h>
68 // features are known at build time, so don't call it.
96  * See http://bit.ly/2CcoEsr for run-time detection of ARM features and also
102     uint64_t features = android_getCpuFeatures();  in _cpu_check_features()  local
103     arm_cpu_enable_crc32 = !!(features & ANDROID_CPU_ARM64_FEATURE_CRC32);  in _cpu_check_features()
104     arm_cpu_enable_pmull = !!(features & ANDROID_CPU_ARM64_FEATURE_PMULL);  in _cpu_check_features()
106     uint64_t features = android_getCpuFeatures();  in _cpu_check_features()
107     arm_cpu_enable_crc32 = !!(features & ANDROID_CPU_ARM_FEATURE_CRC32);  in _cpu_check_features()
108     arm_cpu_enable_pmull = !!(features & ANDROID_CPU_ARM_FEATURE_PMULL);  in _cpu_check_features()
110     unsigned long features = getauxval(AT_HWCAP);  in _cpu_check_features()
111     arm_cpu_enable_crc32 = !!(features & HWCAP_CRC32);  in _cpu_check_features()
112     arm_cpu_enable_pmull = !!(features & HWCAP_PMULL);  in _cpu_check_features()
115     unsigned long features = getauxval(AT_HWCAP2);  in _cpu_check_features()
116     arm_cpu_enable_crc32 = !!(features & HWCAP2_CRC32);  in _cpu_check_features()
117     arm_cpu_enable_pmull = !!(features & HWCAP2_PMULL);  in _cpu_check_features()
119     uint32_t features;  in _cpu_check_features()
120     zx_status_t rc = zx_system_get_features(ZX_FEATURE_KIND_CPU, &features);  in _cpu_check_features()
121     if (rc != ZX_OK || (features & ZX_ARM64_FEATURE_ISA_ASIMD) == 0)  in _cpu_check_features()
123     arm_cpu_enable_crc32 = !!(features & ZX_ARM64_FEATURE_ISA_CRC32);  in _cpu_check_features()
124     arm_cpu_enable_pmull = !!(features & ZX_ARM64_FEATURE_ISA_PMULL);  in _cpu_check_features()
129     // Determine what features are supported dynamically. This code is applicable to macOS  in _cpu_check_features()
149 /* On x86 we simply use a instruction to check the CPU features.