Source file src/internal/cpu/cpu_arm64_darwin.go
1 // Copyright 2020 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 //go:build arm64 && darwin && !ios 6 7 package cpu 8 9 func osInit() { 10 // macOS 12 moved these to the hw.optional.arm tree, but as of Go 1.24 we 11 // still support macOS 11. See [Determine Encryption Capabilities]. 12 // 13 // [Determine Encryption Capabilities]: https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics#3918855 14 ARM64.HasATOMICS = sysctlEnabled([]byte("hw.optional.armv8_1_atomics\x00")) 15 ARM64.HasCRC32 = sysctlEnabled([]byte("hw.optional.armv8_crc32\x00")) 16 ARM64.HasSHA512 = sysctlEnabled([]byte("hw.optional.armv8_2_sha512\x00")) 17 ARM64.HasSHA3 = sysctlEnabled([]byte("hw.optional.armv8_2_sha3\x00")) 18 19 ARM64.HasDIT = sysctlEnabled([]byte("hw.optional.arm.FEAT_DIT\x00")) 20 21 // There are no hw.optional sysctl values for the below features on macOS 11 22 // to detect their supported state dynamically (although they are available 23 // in the hw.optional.arm tree on macOS 12). Assume the CPU features that 24 // Apple Silicon M1 supports to be available on all future iterations. 25 ARM64.HasAES = true 26 ARM64.HasPMULL = true 27 ARM64.HasSHA1 = true 28 ARM64.HasSHA2 = true 29 } 30