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Source file src/runtime/os_linux_s390x.go

Documentation: runtime

  // Copyright 2016 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 runtime
  
  import (
  	"runtime/internal/sys"
  )
  
  const (
  	// bit masks taken from bits/hwcap.h
  	_HWCAP_S390_VX = 2048 // vector facility
  )
  
  // facilities is padded to avoid false sharing.
  type facilities struct {
  	_     [sys.CacheLineSize]byte
  	hasVX bool // vector facility
  	_     [sys.CacheLineSize]byte
  }
  
  // cpu indicates the availability of s390x facilities that can be used in
  // Go assembly but are optional on models supported by Go.
  var cpu facilities
  
  func archauxv(tag, val uintptr) {
  	switch tag {
  	case _AT_HWCAP: // CPU capability bit flags
  		cpu.hasVX = val&_HWCAP_S390_VX != 0
  	}
  }
  

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