| // Copyright 2021 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_AARCH64) && defined(OPENSSL_APPLE) && \ |
| !defined(OPENSSL_STATIC_ARMCAP) && !defined(OPENSSL_NO_ASM) |
| |
| #include <sys/sysctl.h> |
| #include <sys/types.h> |
| |
| #include <openssl/arm_arch.h> |
| |
| |
| static int has_hw_feature(const char *name) { |
| int value; |
| size_t len = sizeof(value); |
| if (sysctlbyname(name, &value, &len, NULL, 0) != 0) { |
| return 0; |
| } |
| if (len != sizeof(int)) { |
| // This should not happen. All the values queried should be integer-valued. |
| assert(0); |
| return 0; |
| } |
| |
| // Per sys/sysctl.h: |
| // |
| // Selectors that return errors are not support on the system. Supported |
| // features will return 1 if they are recommended or 0 if they are supported |
| // but are not expected to help performance. Future versions of these |
| // selectors may return larger values as necessary so it is best to test for |
| // non zero. |
| return value != 0; |
| } |
| |
| void OPENSSL_cpuid_setup(void) { |
| // Apple ARM64 platforms have NEON and cryptography extensions available |
| // statically, so we do not need to query them. In particular, there sometimes |
| // are no sysctls corresponding to such features. See below. |
| #if !defined(__ARM_NEON) || !defined(__ARM_FEATURE_AES) || \ |
| !defined(__ARM_FEATURE_SHA2) |
| #error "NEON and crypto extensions should be statically available." |
| #endif |
| OPENSSL_armcap_P = |
| ARMV7_NEON | ARMV8_AES | ARMV8_PMULL | ARMV8_SHA1 | ARMV8_SHA256; |
| |
| // See Apple's documentation for sysctl names: |
| // https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics |
| // |
| // The new feature names, e.g. "hw.optional.arm.FEAT_SHA512", are only |
| // available in macOS 12. For compatibility with macOS 11, we also support |
| // the old names. The old names don't have values for features like FEAT_AES, |
| // so instead we detect them statically above. |
| // |
| // If querying new sysctls, update the Chromium sandbox definition. See |
| // https://crrev.com/c/4415225. |
| if (has_hw_feature("hw.optional.arm.FEAT_SHA512") || |
| has_hw_feature("hw.optional.armv8_2_sha512")) { |
| OPENSSL_armcap_P |= ARMV8_SHA512; |
| } |
| } |
| |
| #endif // OPENSSL_AARCH64 && OPENSSL_APPLE && !OPENSSL_STATIC_ARMCAP |