1 /* Copyright (c) 2016, Google Inc. 2 * 3 * Permission to use, copy, modify, and/or distribute this software for any 4 * purpose with or without fee is hereby granted, provided that the above 5 * copyright notice and this permission notice appear in all copies. 6 * 7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ 14 15 #include <openssl/cpu.h> 16 17 #if defined(OPENSSL_AARCH64) && !defined(OPENSSL_STATIC_ARMCAP) 18 19 #include <sys/auxv.h> 20 21 #include <openssl/arm_arch.h> 22 23 #include "internal.h" 24 25 26 extern uint32_t OPENSSL_armcap_P; 27 28 void OPENSSL_cpuid_setup(void) { 29 unsigned long hwcap = getauxval(AT_HWCAP); 30 31 // See /usr/include/asm/hwcap.h on an aarch64 installation for the source of 32 // these values. 33 static const unsigned long kNEON = 1 << 1; 34 static const unsigned long kAES = 1 << 3; 35 static const unsigned long kPMULL = 1 << 4; 36 static const unsigned long kSHA1 = 1 << 5; 37 static const unsigned long kSHA256 = 1 << 6; 38 39 if ((hwcap & kNEON) == 0) { 40 // Matching OpenSSL, if NEON is missing, don't report other features 41 // either. 42 return; 43 } 44 45 OPENSSL_armcap_P |= ARMV7_NEON; 46 47 if (hwcap & kAES) { 48 OPENSSL_armcap_P |= ARMV8_AES; 49 } 50 if (hwcap & kPMULL) { 51 OPENSSL_armcap_P |= ARMV8_PMULL; 52 } 53 if (hwcap & kSHA1) { 54 OPENSSL_armcap_P |= ARMV8_SHA1; 55 } 56 if (hwcap & kSHA256) { 57 OPENSSL_armcap_P |= ARMV8_SHA256; 58 } 59 } 60 61 #endif // OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP 62
