| // Copyright 2017 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build arm64 |
| |
| package cpu |
| |
| const CacheLineSize = 64 |
| |
| // arm64 doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2. |
| // These are linknamed in runtime/os_linux_arm64.go and are initialized by |
| // archauxv(). |
| var arm64_hwcap uint |
| var arm64_hwcap2 uint |
| |
| // HWCAP/HWCAP2 bits. These are exposed by Linux. |
| const ( |
| _ARM64_FEATURE_HAS_FP = (1 << 0) |
| _ARM64_FEATURE_HAS_ASIMD = (1 << 1) |
| _ARM64_FEATURE_HAS_EVTSTRM = (1 << 2) |
| _ARM64_FEATURE_HAS_AES = (1 << 3) |
| _ARM64_FEATURE_HAS_PMULL = (1 << 4) |
| _ARM64_FEATURE_HAS_SHA1 = (1 << 5) |
| _ARM64_FEATURE_HAS_SHA2 = (1 << 6) |
| _ARM64_FEATURE_HAS_CRC32 = (1 << 7) |
| _ARM64_FEATURE_HAS_ATOMICS = (1 << 8) |
| ) |
| |
| func init() { |
| // HWCAP feature bits |
| ARM64.HasFP = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_FP) |
| ARM64.HasASIMD = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_ASIMD) |
| ARM64.HasEVTSTRM = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_EVTSTRM) |
| ARM64.HasAES = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_AES) |
| ARM64.HasPMULL = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_PMULL) |
| ARM64.HasSHA1 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_SHA1) |
| ARM64.HasSHA2 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_SHA2) |
| ARM64.HasCRC32 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_CRC32) |
| ARM64.HasATOMICS = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_ATOMICS) |
| } |
| |
| func isSet(hwc uint, value uint) bool { |
| return hwc&value != 0 |
| } |
