github.com/guyezi/gofrontend@v0.0.0-20200228202240-7a62a49e62c0/libgo/go/internal/cpu/cpu_arm64.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  package cpu
     6  
     7  // arm64 doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
     8  // These are initialized by archauxv in runtime/os_linux_arm64.go.
     9  // These should not be changed after they are initialized.
    10  var HWCap uint
    11  var HWCap2 uint
    12  
    13  // HWCAP/HWCAP2 bits. These are exposed by Linux.
    14  const (
    15  	hwcap_FP       = 1 << 0
    16  	hwcap_ASIMD    = 1 << 1
    17  	hwcap_EVTSTRM  = 1 << 2
    18  	hwcap_AES      = 1 << 3
    19  	hwcap_PMULL    = 1 << 4
    20  	hwcap_SHA1     = 1 << 5
    21  	hwcap_SHA2     = 1 << 6
    22  	hwcap_CRC32    = 1 << 7
    23  	hwcap_ATOMICS  = 1 << 8
    24  	hwcap_FPHP     = 1 << 9
    25  	hwcap_ASIMDHP  = 1 << 10
    26  	hwcap_CPUID    = 1 << 11
    27  	hwcap_ASIMDRDM = 1 << 12
    28  	hwcap_JSCVT    = 1 << 13
    29  	hwcap_FCMA     = 1 << 14
    30  	hwcap_LRCPC    = 1 << 15
    31  	hwcap_DCPOP    = 1 << 16
    32  	hwcap_SHA3     = 1 << 17
    33  	hwcap_SM3      = 1 << 18
    34  	hwcap_SM4      = 1 << 19
    35  	hwcap_ASIMDDP  = 1 << 20
    36  	hwcap_SHA512   = 1 << 21
    37  	hwcap_SVE      = 1 << 22
    38  	hwcap_ASIMDFHM = 1 << 23
    39  )
    40  
    41  func doinit() {
    42  	options = []option{
    43  		{Name: "evtstrm", Feature: &ARM64.HasEVTSTRM},
    44  		{Name: "aes", Feature: &ARM64.HasAES},
    45  		{Name: "pmull", Feature: &ARM64.HasPMULL},
    46  		{Name: "sha1", Feature: &ARM64.HasSHA1},
    47  		{Name: "sha2", Feature: &ARM64.HasSHA2},
    48  		{Name: "crc32", Feature: &ARM64.HasCRC32},
    49  		{Name: "atomics", Feature: &ARM64.HasATOMICS},
    50  		{Name: "fphp", Feature: &ARM64.HasFPHP},
    51  		{Name: "asimdhp", Feature: &ARM64.HasASIMDHP},
    52  		{Name: "cpuid", Feature: &ARM64.HasCPUID},
    53  		{Name: "asimdrdm", Feature: &ARM64.HasASIMDRDM},
    54  		{Name: "jscvt", Feature: &ARM64.HasJSCVT},
    55  		{Name: "fcma", Feature: &ARM64.HasFCMA},
    56  		{Name: "lrcpc", Feature: &ARM64.HasLRCPC},
    57  		{Name: "dcpop", Feature: &ARM64.HasDCPOP},
    58  		{Name: "sha3", Feature: &ARM64.HasSHA3},
    59  		{Name: "sm3", Feature: &ARM64.HasSM3},
    60  		{Name: "sm4", Feature: &ARM64.HasSM4},
    61  		{Name: "asimddp", Feature: &ARM64.HasASIMDDP},
    62  		{Name: "sha512", Feature: &ARM64.HasSHA512},
    63  		{Name: "sve", Feature: &ARM64.HasSVE},
    64  		{Name: "asimdfhm", Feature: &ARM64.HasASIMDFHM},
    65  
    66  		// These capabilities should always be enabled on arm64:
    67  		{Name: "fp", Feature: &ARM64.HasFP, Required: true},
    68  		{Name: "asimd", Feature: &ARM64.HasASIMD, Required: true},
    69  	}
    70  
    71  	// HWCAP feature bits
    72  	ARM64.HasFP = isSet(HWCap, hwcap_FP)
    73  	ARM64.HasASIMD = isSet(HWCap, hwcap_ASIMD)
    74  	ARM64.HasEVTSTRM = isSet(HWCap, hwcap_EVTSTRM)
    75  	ARM64.HasAES = isSet(HWCap, hwcap_AES)
    76  	ARM64.HasPMULL = isSet(HWCap, hwcap_PMULL)
    77  	ARM64.HasSHA1 = isSet(HWCap, hwcap_SHA1)
    78  	ARM64.HasSHA2 = isSet(HWCap, hwcap_SHA2)
    79  	ARM64.HasCRC32 = isSet(HWCap, hwcap_CRC32)
    80  	ARM64.HasATOMICS = isSet(HWCap, hwcap_ATOMICS)
    81  	ARM64.HasFPHP = isSet(HWCap, hwcap_FPHP)
    82  	ARM64.HasASIMDHP = isSet(HWCap, hwcap_ASIMDHP)
    83  	ARM64.HasCPUID = isSet(HWCap, hwcap_CPUID)
    84  	ARM64.HasASIMDRDM = isSet(HWCap, hwcap_ASIMDRDM)
    85  	ARM64.HasJSCVT = isSet(HWCap, hwcap_JSCVT)
    86  	ARM64.HasFCMA = isSet(HWCap, hwcap_FCMA)
    87  	ARM64.HasLRCPC = isSet(HWCap, hwcap_LRCPC)
    88  	ARM64.HasDCPOP = isSet(HWCap, hwcap_DCPOP)
    89  	ARM64.HasSHA3 = isSet(HWCap, hwcap_SHA3)
    90  	ARM64.HasSM3 = isSet(HWCap, hwcap_SM3)
    91  	ARM64.HasSM4 = isSet(HWCap, hwcap_SM4)
    92  	ARM64.HasASIMDDP = isSet(HWCap, hwcap_ASIMDDP)
    93  	ARM64.HasSHA512 = isSet(HWCap, hwcap_SHA512)
    94  	ARM64.HasSVE = isSet(HWCap, hwcap_SVE)
    95  	ARM64.HasASIMDFHM = isSet(HWCap, hwcap_ASIMDFHM)
    96  }
    97  
    98  func isSet(hwc uint, value uint) bool {
    99  	return hwc&value != 0
   100  }