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/* Copyright (c) 2021, 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 "internal.h"
#if defined(OPENSSL_AARCH64) && defined(OPENSSL_APPLE) && \
!defined(OPENSSL_STATIC_ARMCAP)
#include <sys/sysctl.h>
#include <sys/types.h>
#include <openssl/arm_arch.h>
extern uint32_t OPENSSL_armcap_P;
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