github.com/icodeface/tls@v0.0.0-20230910023335-34df9250cd12/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  const CacheLinePadSize = 128
    10  
    11  // ppc64x doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
    12  // These are initialized by archauxv in runtime/os_linux_ppc64x.go.
    13  // These should not be changed after they are initialized.
    14  // On aix/ppc64, these values are initialized early in the runtime in runtime/os_aix.go.
    15  var HWCap uint
    16  var HWCap2 uint
    17  
    18  // HWCAP/HWCAP2 bits. These are exposed by the kernel.
    19  const (
    20  	// ISA Level
    21  	PPC_FEATURE2_ARCH_2_07 = 0x80000000
    22  	PPC_FEATURE2_ARCH_3_00 = 0x00800000
    23  
    24  	// CPU features
    25  	PPC_FEATURE2_DARN = 0x00200000
    26  	PPC_FEATURE2_SCV  = 0x00100000
    27  )
    28  
    29  func doinit() {
    30  	options = []option{
    31  		{Name: "darn", Feature: &PPC64.HasDARN},
    32  		{Name: "scv", Feature: &PPC64.HasSCV},
    33  		{Name: "power9", Feature: &PPC64.IsPOWER9},
    34  
    35  		// These capabilities should always be enabled on ppc64 and ppc64le:
    36  		{Name: "power8", Feature: &PPC64.IsPOWER8, Required: true},
    37  	}
    38  
    39  	// HWCAP2 feature bits
    40  	PPC64.IsPOWER8 = isSet(HWCap2, PPC_FEATURE2_ARCH_2_07)
    41  	PPC64.IsPOWER9 = isSet(HWCap2, PPC_FEATURE2_ARCH_3_00)
    42  	PPC64.HasDARN = isSet(HWCap2, PPC_FEATURE2_DARN)
    43  	PPC64.HasSCV = isSet(HWCap2, PPC_FEATURE2_SCV)
    44  }
    45  
    46  func isSet(hwc uint, value uint) bool {
    47  	return hwc&value != 0
    48  }