// initialized.
var HWCap uint

// HWCAP bits. These are exposed by the Linux kernel 5.4.
const (
	// CPU features
	hwcap_MIPS_MSA = 1 << 1
)

func doinit() {
	options = []option{
		{Name: "msa", Feature: &MIPS64X.HasMSA},
	}

	// HWCAP feature bits
	MIPS64X.HasMSA = isSet(HWCap, hwcap_MIPS_MSA)
}

func isSet(hwc uint, value uint) bool {

package runtime

import "internal/cpu"

func archauxv(tag, val uintptr) {
	switch tag {
	case _AT_HWCAP:
		// ppc64x doesn't have a 'cpuid' instruction
		// equivalent and relies on HWCAP/HWCAP2 bits for
		// hardware capabilities.
		cpu.HWCap = uint(val)
	case _AT_HWCAP2:
		cpu.HWCap2 = uint(val)
	}
}

//go:build ppc64 || ppc64le

package cpu

// ppc64 doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
// These are initialized by archauxv and should not be changed after they are
// initialized.
var HWCap uint
var HWCap2 uint

// HWCAP bits. These are exposed by Linux.
const (
	// ISA Level
	hwcap2_ARCH_2_07 = 0x80000000
	hwcap2_ARCH_3_00 = 0x00800000

package cpu

const (
	// bit mask values from /usr/include/bits/hwcap.h
	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

	_HWCAP_VX = 1 << 11 // vector facility
)

func archauxv(tag, val uintptr) {
	switch tag {
	case _AT_HWCAP:
		cpu.HWCap = uint(val)
	}
}

func osArchInit() {}

func checkS390xCPU() {
	// Check if the present z-system has the hardware capability to carryout
	// floating point operations. Check if hwcap reflects CPU capability for the
	// necessary floating point hardware (HasVX) availability.

	ARM.HasTHUMBEE = isSet(hwCap, hwcap_THUMBEE)
	ARM.HasNEON = isSet(hwCap, hwcap_NEON)
	ARM.HasVFPv3 = isSet(hwCap, hwcap_VFPv3)
	ARM.HasVFPv3D16 = isSet(hwCap, hwcap_VFPv3D16)
	ARM.HasTLS = isSet(hwCap, hwcap_TLS)
	ARM.HasVFPv4 = isSet(hwCap, hwcap_VFPv4)
	ARM.HasIDIVA = isSet(hwCap, hwcap_IDIVA)
	ARM.HasIDIVT = isSet(hwCap, hwcap_IDIVT)
	ARM.HasVFPD32 = isSet(hwCap, hwcap_VFPD32)
	ARM.HasLPAE = isSet(hwCap, hwcap_LPAE)

	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)

)

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)

	_AT_HWCAP2 = 26

	procAuxv = "/proc/self/auxv"

	uintSize = int(32 << (^uint(0) >> 63))
)

// For those platforms don't have a 'cpuid' equivalent we use HWCAP/HWCAP2
// These are initialized in cpu_$GOARCH.go
// and should not be changed after they are initialized.
var hwCap uint
var hwCap2 uint

func readHWCAP() error {
	// For Go 1.21+, get auxv from the Go runtime.
	if a := getAuxv(); len(a) > 0 {
		for len(a) >= 2 {

)

func vdsoCall()

func checkgoarm() {
	// On Android, /proc/self/auxv might be unreadable and hwcap won't
	// reflect the CPU capabilities. Assume that every Android arm device
	// has the necessary floating point hardware available.
	if GOOS == "android" {
		return
	}
	if cpu.HWCap&_HWCAP_VFP == 0 && goarmsoftfp == 0 {
		print("runtime: this CPU has no floating point hardware, so it cannot run\n")