Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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72 lines
2.8 KiB
72 lines
2.8 KiB
/* Copyright (c) 2021, Google Inc. |
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* |
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* Permission to use, copy, modify, and/or distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ |
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#include "internal.h" |
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#if defined(OPENSSL_AARCH64) && defined(OPENSSL_APPLE) && \ |
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!defined(OPENSSL_STATIC_ARMCAP) |
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#include <sys/sysctl.h> |
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#include <sys/types.h> |
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#include <openssl/arm_arch.h> |
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extern uint32_t OPENSSL_armcap_P; |
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static int has_hw_feature(const char *name) { |
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int value; |
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size_t len = sizeof(value); |
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if (sysctlbyname(name, &value, &len, NULL, 0) != 0) { |
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return 0; |
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} |
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if (len != sizeof(int)) { |
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// This should not happen. All the values queried should be integer-valued. |
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assert(0); |
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return 0; |
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} |
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// Per sys/sysctl.h: |
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// |
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// Selectors that return errors are not support on the system. Supported |
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// features will return 1 if they are recommended or 0 if they are supported |
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// but are not expected to help performance. Future versions of these |
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// selectors may return larger values as necessary so it is best to test for |
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// non zero. |
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return value != 0; |
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} |
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void OPENSSL_cpuid_setup(void) { |
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// Apple ARM64 platforms have NEON and cryptography extensions available |
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// statically, so we do not need to query them. In particular, there sometimes |
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// are no sysctls corresponding to such features. See below. |
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#if !defined(__ARM_NEON) || !defined(__ARM_FEATURE_AES) || \ |
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!defined(__ARM_FEATURE_SHA2) |
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#error "NEON and crypto extensions should be statically available." |
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#endif |
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OPENSSL_armcap_P = |
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ARMV7_NEON | ARMV8_AES | ARMV8_PMULL | ARMV8_SHA1 | ARMV8_SHA256; |
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// macOS has sysctls named both like "hw.optional.arm.FEAT_SHA512" and like |
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// "hw.optional.armv8_2_sha512". There does not appear to be documentation on |
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// which to use. The "armv8_2_sha512" style omits statically-available |
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// features, while the "FEAT_SHA512" style includes them. However, the |
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// "FEAT_SHA512" style was added in macOS 12, so we use the older style for |
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// better compatibility and handle static features above. |
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if (has_hw_feature("hw.optional.armv8_2_sha512")) { |
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OPENSSL_armcap_P |= ARMV8_SHA512; |
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} |
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} |
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#endif // OPENSSL_AARCH64 && OPENSSL_APPLE && !OPENSSL_STATIC_ARMCAP
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