github.com/guyezi/gofrontend@v0.0.0-20200228202240-7a62a49e62c0/libgo/go/internal/cpu/cpu_ppc64x.go (about)

     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  // ppc64x doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
    10  // These are initialized by archauxv in runtime/os_linux_ppc64x.go.
    11  // These should not be changed after they are initialized.
    12  // On aix/ppc64, these values are initialized early in the runtime in runtime/os_aix.go.
    13  var HWCap uint
    14  var HWCap2 uint
    15  
    16  // HWCAP/HWCAP2 bits. These are exposed by the kernel.
    17  const (
    18  	// ISA Level
    19  	PPC_FEATURE2_ARCH_2_07 = 0x80000000
    20  	PPC_FEATURE2_ARCH_3_00 = 0x00800000
    21  
    22  	// CPU features
    23  	PPC_FEATURE2_DARN = 0x00200000
    24  	PPC_FEATURE2_SCV  = 0x00100000
    25  )
    26  
    27  func doinit() {
    28  	options = []option{
    29  		{Name: "darn", Feature: &PPC64.HasDARN},
    30  		{Name: "scv", Feature: &PPC64.HasSCV},
    31  		{Name: "power9", Feature: &PPC64.IsPOWER9},
    32  		{Name: "power8", Feature: &PPC64.IsPOWER8},
    33  	}
    34  
    35  	// HWCAP2 feature bits
    36  	PPC64.IsPOWER8 = isSet(HWCap2, PPC_FEATURE2_ARCH_2_07)
    37  	PPC64.IsPOWER9 = isSet(HWCap2, PPC_FEATURE2_ARCH_3_00)
    38  	PPC64.HasDARN = isSet(HWCap2, PPC_FEATURE2_DARN)
    39  	PPC64.HasSCV = isSet(HWCap2, PPC_FEATURE2_SCV)
    40  }
    41  
    42  func isSet(hwc uint, value uint) bool {
    43  	return hwc&value != 0
    44  }