| // Copyright 2019 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. |
| |
| package cpu |
| |
| import "runtime" |
| |
| const cacheLineSize = 64 |
| |
| func init() { |
| switch runtime.GOOS { |
| case "android", "darwin": |
| // Android and iOS don't seem to allow reading these registers. |
| // Fake the minimal features expected by |
| // TestARM64minimalFeatures. |
| ARM64.HasASIMD = true |
| ARM64.HasFP = true |
| case "linux": |
| doinit() |
| default: |
| readARM64Registers() |
| } |
| } |
| |
| func readARM64Registers() { |
| Initialized = true |
| |
| // ID_AA64ISAR0_EL1 |
| isar0 := getisar0() |
| |
| switch extractBits(isar0, 4, 7) { |
| case 1: |
| ARM64.HasAES = true |
| case 2: |
| ARM64.HasAES = true |
| ARM64.HasPMULL = true |
| } |
| |
| switch extractBits(isar0, 8, 11) { |
| case 1: |
| ARM64.HasSHA1 = true |
| } |
| |
| switch extractBits(isar0, 12, 15) { |
| case 1: |
| ARM64.HasSHA2 = true |
| case 2: |
| ARM64.HasSHA2 = true |
| ARM64.HasSHA512 = true |
| } |
| |
| switch extractBits(isar0, 16, 19) { |
| case 1: |
| ARM64.HasCRC32 = true |
| } |
| |
| switch extractBits(isar0, 20, 23) { |
| case 2: |
| ARM64.HasATOMICS = true |
| } |
| |
| switch extractBits(isar0, 28, 31) { |
| case 1: |
| ARM64.HasASIMDRDM = true |
| } |
| |
| switch extractBits(isar0, 32, 35) { |
| case 1: |
| ARM64.HasSHA3 = true |
| } |
| |
| switch extractBits(isar0, 36, 39) { |
| case 1: |
| ARM64.HasSM3 = true |
| } |
| |
| switch extractBits(isar0, 40, 43) { |
| case 1: |
| ARM64.HasSM4 = true |
| } |
| |
| switch extractBits(isar0, 44, 47) { |
| case 1: |
| ARM64.HasASIMDDP = true |
| } |
| |
| // ID_AA64ISAR1_EL1 |
| isar1 := getisar1() |
| |
| switch extractBits(isar1, 0, 3) { |
| case 1: |
| ARM64.HasDCPOP = true |
| } |
| |
| switch extractBits(isar1, 12, 15) { |
| case 1: |
| ARM64.HasJSCVT = true |
| } |
| |
| switch extractBits(isar1, 16, 19) { |
| case 1: |
| ARM64.HasFCMA = true |
| } |
| |
| switch extractBits(isar1, 20, 23) { |
| case 1: |
| ARM64.HasLRCPC = true |
| } |
| |
| // ID_AA64PFR0_EL1 |
| pfr0 := getpfr0() |
| |
| switch extractBits(pfr0, 16, 19) { |
| case 0: |
| ARM64.HasFP = true |
| case 1: |
| ARM64.HasFP = true |
| ARM64.HasFPHP = true |
| } |
| |
| switch extractBits(pfr0, 20, 23) { |
| case 0: |
| ARM64.HasASIMD = true |
| case 1: |
| ARM64.HasASIMD = true |
| ARM64.HasASIMDHP = true |
| } |
| |
| switch extractBits(pfr0, 32, 35) { |
| case 1: |
| ARM64.HasSVE = true |
| } |
| } |
| |
| func extractBits(data uint64, start, end uint) uint { |
| return (uint)(data>>start) & ((1 << (end - start + 1)) - 1) |
| } |