David Benjamin
9bb8f779a7
This header used to supply CPU capability constants and things like __ARM_MAX_ARCH__. The latter is now part of asm_base.h, automatically included by everything, and assembly files no longer do capability checks. The immediate motivation was that there were a few misspelled includes that used "openssl/arm_arch.h" instead of <openssl/arm_arch.h> (see https://boringssl-review.googlesource.com/c/boringssl/+/76247), but given we can just remove them anyway, may as well clear this out. This now also means we don't pollute another prefix in the global namespace (though external callers shouldn't have been using this header anyway). I've kept the header around, but a no-op, because some bindings libraries have explicitly listed the header and it's probably not worth the trouble to clear those out. Bug: 42290548 Change-Id: I24f36cd48b0e3b6498ecbdc70fecc36961a8b9fe Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/76248 Auto-Submit: David Benjamin <davidben@google.com> Reviewed-by: Bob Beck <bbe@google.com> Commit-Queue: Bob Beck <bbe@google.com>
93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
// Copyright 2023 The BoringSSL Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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!defined(OPENSSL_NO_ASM)
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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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