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- /* Copyright (c) 2016, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- #include <openssl/cpu.h>
-
- #if defined(OPENSSL_AARCH64) && defined(OPENSSL_LINUX) && \
- !defined(OPENSSL_STATIC_ARMCAP)
-
- #include <sys/auxv.h>
-
- #include <openssl/arm_arch.h>
-
- #include "internal.h"
-
-
- extern uint32_t OPENSSL_armcap_P;
-
- void OPENSSL_cpuid_setup(void) {
- unsigned long hwcap = getauxval(AT_HWCAP);
-
- // See /usr/include/asm/hwcap.h on an aarch64 installation for the source of
- // these values.
- static const unsigned long kNEON = 1 << 1;
- static const unsigned long kAES = 1 << 3;
- static const unsigned long kPMULL = 1 << 4;
- static const unsigned long kSHA1 = 1 << 5;
- static const unsigned long kSHA256 = 1 << 6;
-
- if ((hwcap & kNEON) == 0) {
- // Matching OpenSSL, if NEON is missing, don't report other features
- // either.
- return;
- }
-
- OPENSSL_armcap_P |= ARMV7_NEON;
-
- if (hwcap & kAES) {
- OPENSSL_armcap_P |= ARMV8_AES;
- }
- if (hwcap & kPMULL) {
- OPENSSL_armcap_P |= ARMV8_PMULL;
- }
- if (hwcap & kSHA1) {
- OPENSSL_armcap_P |= ARMV8_SHA1;
- }
- if (hwcap & kSHA256) {
- OPENSSL_armcap_P |= ARMV8_SHA256;
- }
- }
-
- #endif // OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP
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