diff options
Diffstat (limited to 'vendor/golang.org/x/sys/cpu/cpu_arm64.go')
-rw-r--r-- | vendor/golang.org/x/sys/cpu/cpu_arm64.go | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/vendor/golang.org/x/sys/cpu/cpu_arm64.go b/vendor/golang.org/x/sys/cpu/cpu_arm64.go new file mode 100644 index 000000000..6ac0b3535 --- /dev/null +++ b/vendor/golang.org/x/sys/cpu/cpu_arm64.go @@ -0,0 +1,134 @@ +// 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 "darwin": + // iOS does not seem to allow reading these registers + case "android", "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) +} |