1 // Copyright 2016 The BoringSSL Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "internal.h" 16 17 #if defined(OPENSSL_AARCH64) && defined(OPENSSL_LINUX) && \ 18 !defined(OPENSSL_STATIC_ARMCAP) && !defined(OPENSSL_NO_ASM) 19 20 #include <sys/auxv.h> 21 22 OPENSSL_cpuid_setup(void)23void OPENSSL_cpuid_setup(void) { 24 unsigned long hwcap = getauxval(AT_HWCAP); 25 26 // See /usr/include/asm/hwcap.h on an aarch64 installation for the source of 27 // these values. 28 static const unsigned long kNEON = 1 << 1; 29 static const unsigned long kAES = 1 << 3; 30 static const unsigned long kPMULL = 1 << 4; 31 static const unsigned long kSHA1 = 1 << 5; 32 static const unsigned long kSHA256 = 1 << 6; 33 static const unsigned long kSHA512 = 1 << 21; 34 35 if ((hwcap & kNEON) == 0) { 36 // Matching OpenSSL, if NEON is missing, don't report other features 37 // either. 38 return; 39 } 40 41 OPENSSL_armcap_P |= ARMV7_NEON; 42 43 if (hwcap & kAES) { 44 OPENSSL_armcap_P |= ARMV8_AES; 45 } 46 if (hwcap & kPMULL) { 47 OPENSSL_armcap_P |= ARMV8_PMULL; 48 } 49 if (hwcap & kSHA1) { 50 OPENSSL_armcap_P |= ARMV8_SHA1; 51 } 52 if (hwcap & kSHA256) { 53 OPENSSL_armcap_P |= ARMV8_SHA256; 54 } 55 if (hwcap & kSHA512) { 56 OPENSSL_armcap_P |= ARMV8_SHA512; 57 } 58 } 59 60 #endif // OPENSSL_AARCH64 && OPENSSL_LINUX && !OPENSSL_STATIC_ARMCAP 61