// Copyright 2020 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

func initS390Xbase() {
	// get the facilities list
	facilities := stfle()

	// mandatory
	S390X.HasZARCH = facilities.Has(zarch)
	S390X.HasSTFLE = facilities.Has(stflef)
	S390X.HasLDISP = facilities.Has(ldisp)
	S390X.HasEIMM = facilities.Has(eimm)

	// optional

	hwcap_ZARCH  = 2
	hwcap_STFLE  = 4
	hwcap_MSA    = 8
	hwcap_LDISP  = 16
	hwcap_EIMM   = 32
	hwcap_DFP    = 64
	hwcap_ETF3EH = 256
	hwcap_VX     = 2048
	hwcap_VXE    = 8192
)

func initS390Xbase() {
	// test HWCAP bit vector
	has := func(featureMask uint) bool {
		return hwCap&featureMask == featureMask
	}

	// mandatory
	S390X.HasZARCH = has(hwcap_ZARCH)

	// optional

	if len(fns) == 0 {
		panic("no function codes provided")
	}
	for _, f := range fns {
		if !bitIsSet(q.bits[:], uint(f)) {
			return false
		}
	}
	return true
}

func doinit() {
	initS390Xbase()

	// We need implementations of stfle, km and so on
	// to detect cryptographic features.
	if !haveAsmFunctions() {
		return
	}

	// optional cryptographic functions
	if S390X.HasMSA {