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Source file src/internal/cpu/cpu_arm64.go

Documentation: internal/cpu

  // 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.
  
  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 hwcap uint
  var hwcap2 uint
  
  // HWCAP/HWCAP2 bits. These are exposed by Linux.
  const (
  	hwcap_FP       = (1 << 0)
  	hwcap_ASIMD    = (1 << 1)
  	hwcap_EVTSTRM  = (1 << 2)
  	hwcap_AES      = (1 << 3)
  	hwcap_PMULL    = (1 << 4)
  	hwcap_SHA1     = (1 << 5)
  	hwcap_SHA2     = (1 << 6)
  	hwcap_CRC32    = (1 << 7)
  	hwcap_ATOMICS  = (1 << 8)
  	hwcap_FPHP     = (1 << 9)
  	hwcap_ASIMDHP  = (1 << 10)
  	hwcap_CPUID    = (1 << 11)
  	hwcap_ASIMDRDM = (1 << 12)
  	hwcap_JSCVT    = (1 << 13)
  	hwcap_FCMA     = (1 << 14)
  	hwcap_LRCPC    = (1 << 15)
  	hwcap_DCPOP    = (1 << 16)
  	hwcap_SHA3     = (1 << 17)
  	hwcap_SM3      = (1 << 18)
  	hwcap_SM4      = (1 << 19)
  	hwcap_ASIMDDP  = (1 << 20)
  	hwcap_SHA512   = (1 << 21)
  	hwcap_SVE      = (1 << 22)
  	hwcap_ASIMDFHM = (1 << 23)
  )
  
  func doinit() {
  	options = []option{
  		{"evtstrm", &ARM64.HasEVTSTRM},
  		{"aes", &ARM64.HasAES},
  		{"pmull", &ARM64.HasPMULL},
  		{"sha1", &ARM64.HasSHA1},
  		{"sha2", &ARM64.HasSHA2},
  		{"crc32", &ARM64.HasCRC32},
  		{"atomics", &ARM64.HasATOMICS},
  		{"fphp", &ARM64.HasFPHP},
  		{"asimdhp", &ARM64.HasASIMDHP},
  		{"cpuid", &ARM64.HasCPUID},
  		{"asimdrdm", &ARM64.HasASIMDRDM},
  		{"jscvt", &ARM64.HasJSCVT},
  		{"fcma", &ARM64.HasFCMA},
  		{"lrcpc", &ARM64.HasLRCPC},
  		{"dcpop", &ARM64.HasDCPOP},
  		{"sha3", &ARM64.HasSHA3},
  		{"sm3", &ARM64.HasSM3},
  		{"sm4", &ARM64.HasSM4},
  		{"asimddp", &ARM64.HasASIMDDP},
  		{"sha512", &ARM64.HasSHA512},
  		{"sve", &ARM64.HasSVE},
  		{"asimdfhm", &ARM64.HasASIMDFHM},
  
  		// These capabilities should always be enabled on arm64:
  		//  {"fp", &ARM64.HasFP},
  		//  {"asimd", &ARM64.HasASIMD},
  	}
  
  	// HWCAP feature bits
  	ARM64.HasFP = isSet(hwcap, hwcap_FP)
  	ARM64.HasASIMD = isSet(hwcap, hwcap_ASIMD)
  	ARM64.HasEVTSTRM = isSet(hwcap, hwcap_EVTSTRM)
  	ARM64.HasAES = isSet(hwcap, hwcap_AES)
  	ARM64.HasPMULL = isSet(hwcap, hwcap_PMULL)
  	ARM64.HasSHA1 = isSet(hwcap, hwcap_SHA1)
  	ARM64.HasSHA2 = isSet(hwcap, hwcap_SHA2)
  	ARM64.HasCRC32 = isSet(hwcap, hwcap_CRC32)
  	ARM64.HasATOMICS = isSet(hwcap, hwcap_ATOMICS)
  	ARM64.HasFPHP = isSet(hwcap, hwcap_FPHP)
  	ARM64.HasASIMDHP = isSet(hwcap, hwcap_ASIMDHP)
  	ARM64.HasCPUID = isSet(hwcap, hwcap_CPUID)
  	ARM64.HasASIMDRDM = isSet(hwcap, hwcap_ASIMDRDM)
  	ARM64.HasJSCVT = isSet(hwcap, hwcap_JSCVT)
  	ARM64.HasFCMA = isSet(hwcap, hwcap_FCMA)
  	ARM64.HasLRCPC = isSet(hwcap, hwcap_LRCPC)
  	ARM64.HasDCPOP = isSet(hwcap, hwcap_DCPOP)
  	ARM64.HasSHA3 = isSet(hwcap, hwcap_SHA3)
  	ARM64.HasSM3 = isSet(hwcap, hwcap_SM3)
  	ARM64.HasSM4 = isSet(hwcap, hwcap_SM4)
  	ARM64.HasASIMDDP = isSet(hwcap, hwcap_ASIMDDP)
  	ARM64.HasSHA512 = isSet(hwcap, hwcap_SHA512)
  	ARM64.HasSVE = isSet(hwcap, hwcap_SVE)
  	ARM64.HasASIMDFHM = isSet(hwcap, hwcap_ASIMDFHM)
  }
  
  func isSet(hwc uint, value uint) bool {
  	return hwc&value != 0
  }
  

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