github.com/guyezi/gofrontend@v0.0.0-20200228202240-7a62a49e62c0/libgo/go/runtime/os_linux_s390x.go (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package runtime
     6  
     7  import "internal/cpu"
     8  
     9  const (
    10  	// bit masks taken from bits/hwcap.h
    11  	_HWCAP_S390_ZARCH  = 2
    12  	_HWCAP_S390_STFLE  = 4
    13  	_HWCAP_S390_MSA    = 8
    14  	_HWCAP_S390_LDISP  = 16
    15  	_HWCAP_S390_EIMM   = 32
    16  	_HWCAP_S390_DFP    = 64
    17  	_HWCAP_S390_ETF3EH = 256
    18  	_HWCAP_S390_VX     = 2048 // vector facility
    19  	_HWCAP_S390_VXE    = 8192
    20  )
    21  
    22  func archauxv(tag, val uintptr) {
    23  	switch tag {
    24  	case _AT_HWCAP: // CPU capability bit flags
    25  		cpu.S390X.HasZARCH = val&_HWCAP_S390_ZARCH != 0
    26  		cpu.S390X.HasSTFLE = val&_HWCAP_S390_STFLE != 0
    27  		cpu.S390X.HasLDISP = val&_HWCAP_S390_LDISP != 0
    28  		cpu.S390X.HasEIMM = val&_HWCAP_S390_EIMM != 0
    29  		cpu.S390X.HasDFP = val&_HWCAP_S390_DFP != 0
    30  		cpu.S390X.HasETF3EH = val&_HWCAP_S390_ETF3EH != 0
    31  		cpu.S390X.HasMSA = val&_HWCAP_S390_MSA != 0
    32  		cpu.S390X.HasVX = val&_HWCAP_S390_VX != 0
    33  		cpu.S390X.HasVXE = val&_HWCAP_S390_VXE != 0
    34  	}
    35  }