// 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.

//go:build arm64

package cpu

func osInit() {
	// Retrieve info from system register ID_AA64ISAR0_EL1.
	isar0 := getisar0()

	parseARM64SystemRegisters(isar0)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build arm64 && !linux && !freebsd && !android && (!darwin || ios) && !openbsd

package cpu

func osInit() {
	// Other operating systems do not support reading HWCap from auxiliary vector,
	// reading privileged aarch64 system registers or sysctl in user space to detect
	// CPU features at runtime.

		{Name: "cpuid", Feature: &ARM64.HasCPUID},
		{Name: "isNeoverse", Feature: &ARM64.IsNeoverse},
	}

	// arm64 uses different ways to detect CPU features at runtime depending on the operating system.
	osInit()
}

func getisar0() uint64

func getMIDR() uint64

func extractBits(data uint64, start, end uint) uint {
	return (uint)(data>>start) & ((1 << (end - start + 1)) - 1)
}

	// From OpenBSD's sys/sysctl.h.
	_CTL_MACHDEP = 7

	// From OpenBSD's machine/cpu.h.
	_CPU_ID_AA64ISAR0 = 2
	_CPU_ID_AA64ISAR1 = 3
)

//go:noescape
func sysctlUint64(mib []uint32) (uint64, bool)

func osInit() {
	// Get ID_AA64ISAR0 from sysctl.
	isar0, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64ISAR0})
	if !ok {
		return
	}
	parseARM64SystemRegisters(isar0)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build (ppc64 || ppc64le) && !aix && !linux

package cpu

func osinit() {
	// Other operating systems do not support reading HWCap from auxiliary vector,
	// reading privileged system registers or sysctl in user space to detect CPU
	// features at runtime.

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime

func checkgoarm() {
	// TODO(minux): FP checks like in os_linux_arm.go.

	// osinit not called yet, so ncpu not set: must use getncpu directly.
	if getncpu() > 1 && goarm < 7 {
		print("runtime: this system has multiple CPUs and must use\n")
		print("atomic synchronization instructions. Recompile using GOARM=7.\n")

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build arm64 && darwin && !ios

package cpu

import _ "unsafe" // for linkname

func osInit() {
	ARM64.HasATOMICS = sysctlEnabled([]byte("hw.optional.armv8_1_atomics\x00"))
	ARM64.HasCRC32 = sysctlEnabled([]byte("hw.optional.armv8_crc32\x00"))
	ARM64.HasSHA512 = sysctlEnabled([]byte("hw.optional.armv8_2_sha512\x00"))

	mc.__gregs[_REG_R1] = uint32(uintptr(unsafe.Pointer(gp)))
	mc.__gregs[_REG_R2] = uint32(fn)
}

func checkgoarm() {
	// TODO(minux): FP checks like in os_linux_arm.go.

	// osinit not called yet, so ncpu not set: must use getncpu directly.
	if getncpu() > 1 && goarm < 7 {
		print("runtime: this system has multiple CPUs and must use\n")
		print("atomic synchronization instructions. Recompile using GOARM=7.\n")

//
//go:noescape
func write1(fd uintptr, p unsafe.Pointer, n int32) int32

//go:noescape
func open(name *byte, mode, perm int32) int32

// return value is only set on linux to be used in osinit().
func madvise(addr unsafe.Pointer, n uintptr, flags int32) int32

// exitThread terminates the current thread, writing *wait = freeMStack when
// the stack is safe to reclaim.
//
//go:noescape

		print("a binary compiled for VFPv3 hard floating point. Recompile adding ,softfloat\n")
		print("to GOARM or changing GOARM to 6.\n")
		exit(1)
	}

	// osinit not called yet, so ncpu not set: must use getncpu directly.
	if getncpu() > 1 && goarm < 7 {
		print("runtime: this system has multiple CPUs and must use\n")
		print("atomic synchronization instructions. Recompile using GOARM=7.\n")