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// Copyright 2023 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 <contrib/restricted/google/boringssl/include/openssl/cpu.h>
#include "internal.h"
// While Arm system registers are normally not available to userspace, FreeBSD
// expects userspace to simply read them. It traps the reads and fills in CPU
// capabilities.
#if defined(OPENSSL_AARCH64) && !defined(OPENSSL_STATIC_ARMCAP) && \
(defined(ANDROID_BAREMETAL) || defined(OPENSSL_FREEBSD)) && \
!defined(OPENSSL_NO_ASM)
#include "./armv8_feature_parsing.h"
BSSL_NAMESPACE_BEGIN
#define ID_AA64PFR0_EL1_ADVSIMD 5
#define READ_SYSREG(name) \
({ \
uint64_t _r; \
__asm__("mrs %0, " name : "=r"(_r)); \
_r; \
})
// We use the common GetIDField helper now, but need a signed variant
// for the NEON check using ID_AA64PFR0_EL1.
static int GetSignedIDField(uint64_t reg, unsigned field) {
unsigned value = armcap::GetIDField(reg, field);
if (value & (1 << (NBITS_ID_FIELD - 1))) {
return (int)(value | (UINT64_MAX << NBITS_ID_FIELD));
} else {
return (int)value;
}
}
void OPENSSL_cpuid_setup() {
uint64_t id_aa64pfr0_el1 = READ_SYSREG("id_aa64pfr0_el1");
if (GetSignedIDField(id_aa64pfr0_el1, ID_AA64PFR0_EL1_ADVSIMD) < 0) {
// If AdvSIMD ("NEON") is missing, don't report other features either.
// This matches OpenSSL.
return;
}
// Use the common parsing function to check all cryptographic features.
uint64_t id_aa64isar0_el1 = READ_SYSREG("id_aa64isar0_el1");
BSSL_armcap_P |= ARMV7_NEON | armcap::ParseISAR0Flags(id_aa64isar0_el1);
}
BSSL_NAMESPACE_END
#endif // OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP &&
// (ANDROID_BAREMETAL || OPENSSL_FREEBSD)
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