// and HasAVX2 are only set if the OS supports XMM and YMM
// registers in addition to the CPUID feature bit being set.
var X86 struct {
	_                   CacheLinePad
	HasAES              bool // AES hardware implementation (AES NI)
	HasADX              bool // Multi-precision add-carry instruction extensions
	HasAVX              bool // Advanced vector extension

		{Name: "idivt", Feature: &ARM.HasIDIVT},
		{Name: "idiva", Feature: &ARM.HasIDIVA},
		{Name: "lpae", Feature: &ARM.HasLPAE},
		{Name: "evtstrm", Feature: &ARM.HasEVTSTRM},
		{Name: "aes", Feature: &ARM.HasAES},
		{Name: "crc32", Feature: &ARM.HasCRC32},
	}

func hwcapInit(os string) {
	// HWCap was populated by the runtime from the auxiliary vector.
	// Use HWCap information since reading aarch64 system registers
	// is not supported in user space on older linux kernels.
	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)

	TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA: true,
	TLS_RSA_WITH_3DES_EDE_CBC_SHA:       true,
}

var (
	hasGCMAsmAMD64 = cpu.X86.HasAES && cpu.X86.HasPCLMULQDQ
	hasGCMAsmARM64 = cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
	// Keep in sync with crypto/aes/cipher_s390x.go.
	hasGCMAsmS390X = cpu.S390X.HasAES && cpu.S390X.HasAESCBC && cpu.S390X.HasAESCTR &&
		(cpu.S390X.HasGHASH || cpu.S390X.HasAESGCM)

			readLinuxProcCPUInfo()
		}
		return
	}

	// 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)

	S390X.HasDFP = facilities.Has(dfp)
	S390X.HasETF3EH = facilities.Has(etf3eh)
	S390X.HasMSA = facilities.Has(msa)

	if S390X.HasMSA {
		// cipher message
		km, kmc := kmQuery(), kmcQuery()
		S390X.HasAES = km.Has(aes...)
		S390X.HasAESCBC = kmc.Has(aes...)
		if facilities.Has(msa4) {
			kmctr := kmctrQuery()
			S390X.HasAESCTR = kmctr.Has(aes...)
		}
		if facilities.Has(msa8) {
			kma := kmaQuery()

func alginit() {
	// Install AES hash algorithms if the instructions needed are present.
	if (GOARCH == "386" || GOARCH == "amd64") &&
		cpu.X86.HasAES && // AESENC
		cpu.X86.HasSSSE3 && // PSHUFB
		cpu.X86.HasSSE41 { // PINSR{D,Q}
		initAlgAES()
		return
	}
	if GOARCH == "arm64" && cpu.ARM64.HasAES {
		initAlgAES()
		return
	}
	for i := range hashkey {
		hashkey[i] = uintptr(bootstrapRand())
	}
}