Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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93 lines
2.9 KiB
93 lines
2.9 KiB
/* Copyright (c) 2023, 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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// While Arm system registers are normally not available to userspace, FreeBSD |
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// expects userspace to simply read them. It traps the reads and fills in CPU |
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// capabilities. |
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#if defined(OPENSSL_AARCH64) && !defined(OPENSSL_STATIC_ARMCAP) && \ |
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(defined(ANDROID_BAREMETAL) || defined(OPENSSL_FREEBSD)) |
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#include <openssl/arm_arch.h> |
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#define ID_AA64PFR0_EL1_ADVSIMD 5 |
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#define ID_AA64ISAR0_EL1_AES 1 |
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#define ID_AA64ISAR0_EL1_SHA1 2 |
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#define ID_AA64ISAR0_EL1_SHA2 3 |
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#define NBITS_ID_FIELD 4 |
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#define READ_SYSREG(name) \ |
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({ \ |
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uint64_t _r; \ |
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__asm__("mrs %0, " name : "=r"(_r)); \ |
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_r; \ |
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}) |
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static unsigned get_id_field(uint64_t reg, unsigned field) { |
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return (reg >> (field * NBITS_ID_FIELD)) & ((1 << NBITS_ID_FIELD) - 1); |
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} |
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static int get_signed_id_field(uint64_t reg, unsigned field) { |
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unsigned value = get_id_field(reg, field); |
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if (value & (1 << (NBITS_ID_FIELD - 1))) { |
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return (int)(value | (UINT64_MAX << NBITS_ID_FIELD)); |
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} else { |
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return (int)value; |
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} |
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} |
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static uint32_t read_armcap(void) { |
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uint32_t armcap = ARMV7_NEON; |
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uint64_t id_aa64pfr0_el1 = READ_SYSREG("id_aa64pfr0_el1"); |
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if (get_signed_id_field(id_aa64pfr0_el1, ID_AA64PFR0_EL1_ADVSIMD) < 0) { |
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// If AdvSIMD ("NEON") is missing, don't report other features either. |
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// This matches OpenSSL. |
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return 0; |
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} |
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uint64_t id_aa64isar0_el1 = READ_SYSREG("id_aa64isar0_el1"); |
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unsigned aes = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_AES); |
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if (aes > 0) { |
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armcap |= ARMV8_AES; |
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} |
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if (aes > 1) { |
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armcap |= ARMV8_PMULL; |
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} |
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unsigned sha1 = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_SHA1); |
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if (sha1 > 0) { |
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armcap |= ARMV8_SHA1; |
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} |
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unsigned sha2 = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_SHA2); |
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if (sha2 > 0) { |
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armcap |= ARMV8_SHA256; |
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} |
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if (sha2 > 1) { |
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armcap |= ARMV8_SHA512; |
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} |
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return armcap; |
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} |
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void OPENSSL_cpuid_setup(void) { OPENSSL_armcap_P |= read_armcap(); } |
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#endif // OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP && |
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// (ANDROID_BAREMETAL || OPENSSL_FREEBSD)
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