cpu_ppc64x.go raw

   1  // Copyright 2017 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  // +build ppc64 ppc64le
   6  
   7  package cpu
   8  
   9  const CacheLineSize = 128
  10  
  11  // ppc64x doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
  12  // These are linknamed in runtime/os_linux_ppc64x.go and are initialized by
  13  // archauxv().
  14  var hwcap uint
  15  var hwcap2 uint
  16  
  17  // HWCAP/HWCAP2 bits. These are exposed by the kernel.
  18  const (
  19  	// ISA Level
  20  	_PPC_FEATURE2_ARCH_2_07 = 0x80000000
  21  	_PPC_FEATURE2_ARCH_3_00 = 0x00800000
  22  
  23  	// CPU features
  24  	_PPC_FEATURE_HAS_ALTIVEC     = 0x10000000
  25  	_PPC_FEATURE_HAS_DFP         = 0x00000400
  26  	_PPC_FEATURE_HAS_VSX         = 0x00000080
  27  	_PPC_FEATURE2_HAS_HTM        = 0x40000000
  28  	_PPC_FEATURE2_HAS_ISEL       = 0x08000000
  29  	_PPC_FEATURE2_HAS_VEC_CRYPTO = 0x02000000
  30  	_PPC_FEATURE2_HTM_NOSC       = 0x01000000
  31  	_PPC_FEATURE2_DARN           = 0x00200000
  32  	_PPC_FEATURE2_SCV            = 0x00100000
  33  )
  34  
  35  func doinit() {
  36  	options = []option{
  37  		{"htm", &PPC64.HasHTM},
  38  		{"htmnosc", &PPC64.HasHTMNOSC},
  39  		{"darn", &PPC64.HasDARN},
  40  		{"scv", &PPC64.HasSCV},
  41  
  42  		// These capabilities should always be enabled on ppc64 and ppc64le:
  43  		//  {"vmx", &PPC64.HasVMX},
  44  		//  {"dfp", &PPC64.HasDFP},
  45  		//  {"vsx", &PPC64.HasVSX},
  46  		//  {"isel", &PPC64.HasISEL},
  47  		//  {"vcrypto", &PPC64.HasVCRYPTO},
  48  	}
  49  
  50  	// HWCAP feature bits
  51  	PPC64.HasVMX = isSet(hwcap, _PPC_FEATURE_HAS_ALTIVEC)
  52  	PPC64.HasDFP = isSet(hwcap, _PPC_FEATURE_HAS_DFP)
  53  	PPC64.HasVSX = isSet(hwcap, _PPC_FEATURE_HAS_VSX)
  54  
  55  	// HWCAP2 feature bits
  56  	PPC64.IsPOWER8 = isSet(hwcap2, _PPC_FEATURE2_ARCH_2_07)
  57  	PPC64.HasHTM = isSet(hwcap2, _PPC_FEATURE2_HAS_HTM)
  58  	PPC64.HasISEL = isSet(hwcap2, _PPC_FEATURE2_HAS_ISEL)
  59  	PPC64.HasVCRYPTO = isSet(hwcap2, _PPC_FEATURE2_HAS_VEC_CRYPTO)
  60  	PPC64.HasHTMNOSC = isSet(hwcap2, _PPC_FEATURE2_HTM_NOSC)
  61  	PPC64.IsPOWER9 = isSet(hwcap2, _PPC_FEATURE2_ARCH_3_00)
  62  	PPC64.HasDARN = isSet(hwcap2, _PPC_FEATURE2_DARN)
  63  	PPC64.HasSCV = isSet(hwcap2, _PPC_FEATURE2_SCV)
  64  }
  65  
  66  func isSet(hwc uint, value uint) bool {
  67  	return hwc&value != 0
  68  }
  69