| // 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 "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 <openssl/arm_arch.h> |
| |
| #define ID_AA64PFR0_EL1_ADVSIMD 5 |
| |
| #define ID_AA64ISAR0_EL1_AES 1 |
| #define ID_AA64ISAR0_EL1_SHA1 2 |
| #define ID_AA64ISAR0_EL1_SHA2 3 |
| |
| #define NBITS_ID_FIELD 4 |
| |
| #define READ_SYSREG(name) \ |
| ({ \ |
| uint64_t _r; \ |
| __asm__("mrs %0, " name : "=r"(_r)); \ |
| _r; \ |
| }) |
| |
| static unsigned get_id_field(uint64_t reg, unsigned field) { |
| return (reg >> (field * NBITS_ID_FIELD)) & ((1 << NBITS_ID_FIELD) - 1); |
| } |
| |
| static int get_signed_id_field(uint64_t reg, unsigned field) { |
| unsigned value = get_id_field(reg, field); |
| if (value & (1 << (NBITS_ID_FIELD - 1))) { |
| return (int)(value | (UINT64_MAX << NBITS_ID_FIELD)); |
| } else { |
| return (int)value; |
| } |
| } |
| |
| static uint32_t read_armcap(void) { |
| uint32_t armcap = ARMV7_NEON; |
| |
| uint64_t id_aa64pfr0_el1 = READ_SYSREG("id_aa64pfr0_el1"); |
| |
| if (get_signed_id_field(id_aa64pfr0_el1, ID_AA64PFR0_EL1_ADVSIMD) < 0) { |
| // If AdvSIMD ("NEON") is missing, don't report other features either. |
| // This matches OpenSSL. |
| return 0; |
| } |
| |
| uint64_t id_aa64isar0_el1 = READ_SYSREG("id_aa64isar0_el1"); |
| |
| unsigned aes = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_AES); |
| if (aes > 0) { |
| armcap |= ARMV8_AES; |
| } |
| if (aes > 1) { |
| armcap |= ARMV8_PMULL; |
| } |
| |
| unsigned sha1 = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_SHA1); |
| if (sha1 > 0) { |
| armcap |= ARMV8_SHA1; |
| } |
| |
| unsigned sha2 = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_SHA2); |
| if (sha2 > 0) { |
| armcap |= ARMV8_SHA256; |
| } |
| if (sha2 > 1) { |
| armcap |= ARMV8_SHA512; |
| } |
| |
| return armcap; |
| } |
| |
| void OPENSSL_cpuid_setup(void) { OPENSSL_armcap_P |= read_armcap(); } |
| |
| #endif // OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP && |
| // (ANDROID_BAREMETAL || OPENSSL_FREEBSD) |