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// Copyright 2022 The BoringSSL Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "internal.h"
#if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_ARM) && \
defined(OPENSSL_FREEBSD) && !defined(OPENSSL_STATIC_ARMCAP)
#include <sys/auxv.h>
#include <sys/types.h>
#include <openssl/arm_arch.h>
#include <openssl/mem.h>
void OPENSSL_cpuid_setup(void) {
unsigned long hwcap = 0, hwcap2 = 0;
// |elf_aux_info| may fail, in which case |hwcap| and |hwcap2| will be
// left at zero. The rest of this function will then gracefully report
// the features are absent.
elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap));
elf_aux_info(AT_HWCAP2, &hwcap2, sizeof(hwcap2));
// Matching OpenSSL, only report other features if NEON is present.
if (hwcap & HWCAP_NEON) {
OPENSSL_armcap_P |= ARMV7_NEON;
if (hwcap2 & HWCAP2_AES) {
OPENSSL_armcap_P |= ARMV8_AES;
}
if (hwcap2 & HWCAP2_PMULL) {
OPENSSL_armcap_P |= ARMV8_PMULL;
}
if (hwcap2 & HWCAP2_SHA1) {
OPENSSL_armcap_P |= ARMV8_SHA1;
}
if (hwcap2 & HWCAP2_SHA2) {
OPENSSL_armcap_P |= ARMV8_SHA256;
}
}
}
#endif // OPENSSL_ARM && OPENSSL_OPENBSD && !OPENSSL_STATIC_ARMCAP