Source file src/internal/cpu/cpu_arm64.go

     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	const CacheLinePadSize = 64
     8	
     9	// arm64 doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
    10	// These are initialized by archauxv in runtime/os_linux_arm64.go.
    11	// These should not be changed after they are initialized.
    12	var HWCap uint
    13	var HWCap2 uint
    14	
    15	// HWCAP/HWCAP2 bits. These are exposed by Linux.
    16	const (
    17		hwcap_FP       = 1 << 0
    18		hwcap_ASIMD    = 1 << 1
    19		hwcap_EVTSTRM  = 1 << 2
    20		hwcap_AES      = 1 << 3
    21		hwcap_PMULL    = 1 << 4
    22		hwcap_SHA1     = 1 << 5
    23		hwcap_SHA2     = 1 << 6
    24		hwcap_CRC32    = 1 << 7
    25		hwcap_ATOMICS  = 1 << 8
    26		hwcap_FPHP     = 1 << 9
    27		hwcap_ASIMDHP  = 1 << 10
    28		hwcap_CPUID    = 1 << 11
    29		hwcap_ASIMDRDM = 1 << 12
    30		hwcap_JSCVT    = 1 << 13
    31		hwcap_FCMA     = 1 << 14
    32		hwcap_LRCPC    = 1 << 15
    33		hwcap_DCPOP    = 1 << 16
    34		hwcap_SHA3     = 1 << 17
    35		hwcap_SM3      = 1 << 18
    36		hwcap_SM4      = 1 << 19
    37		hwcap_ASIMDDP  = 1 << 20
    38		hwcap_SHA512   = 1 << 21
    39		hwcap_SVE      = 1 << 22
    40		hwcap_ASIMDFHM = 1 << 23
    41	)
    42	
    43	func doinit() {
    44		options = []option{
    45			{Name: "evtstrm", Feature: &ARM64.HasEVTSTRM},
    46			{Name: "aes", Feature: &ARM64.HasAES},
    47			{Name: "pmull", Feature: &ARM64.HasPMULL},
    48			{Name: "sha1", Feature: &ARM64.HasSHA1},
    49			{Name: "sha2", Feature: &ARM64.HasSHA2},
    50			{Name: "crc32", Feature: &ARM64.HasCRC32},
    51			{Name: "atomics", Feature: &ARM64.HasATOMICS},
    52			{Name: "fphp", Feature: &ARM64.HasFPHP},
    53			{Name: "asimdhp", Feature: &ARM64.HasASIMDHP},
    54			{Name: "cpuid", Feature: &ARM64.HasCPUID},
    55			{Name: "asimdrdm", Feature: &ARM64.HasASIMDRDM},
    56			{Name: "jscvt", Feature: &ARM64.HasJSCVT},
    57			{Name: "fcma", Feature: &ARM64.HasFCMA},
    58			{Name: "lrcpc", Feature: &ARM64.HasLRCPC},
    59			{Name: "dcpop", Feature: &ARM64.HasDCPOP},
    60			{Name: "sha3", Feature: &ARM64.HasSHA3},
    61			{Name: "sm3", Feature: &ARM64.HasSM3},
    62			{Name: "sm4", Feature: &ARM64.HasSM4},
    63			{Name: "asimddp", Feature: &ARM64.HasASIMDDP},
    64			{Name: "sha512", Feature: &ARM64.HasSHA512},
    65			{Name: "sve", Feature: &ARM64.HasSVE},
    66			{Name: "asimdfhm", Feature: &ARM64.HasASIMDFHM},
    67	
    68			// These capabilities should always be enabled on arm64:
    69			{Name: "fp", Feature: &ARM64.HasFP, Required: true},
    70			{Name: "asimd", Feature: &ARM64.HasASIMD, Required: true},
    71		}
    72	
    73		// HWCAP feature bits
    74		ARM64.HasFP = isSet(HWCap, hwcap_FP)
    75		ARM64.HasASIMD = isSet(HWCap, hwcap_ASIMD)
    76		ARM64.HasEVTSTRM = isSet(HWCap, hwcap_EVTSTRM)
    77		ARM64.HasAES = isSet(HWCap, hwcap_AES)
    78		ARM64.HasPMULL = isSet(HWCap, hwcap_PMULL)
    79		ARM64.HasSHA1 = isSet(HWCap, hwcap_SHA1)
    80		ARM64.HasSHA2 = isSet(HWCap, hwcap_SHA2)
    81		ARM64.HasCRC32 = isSet(HWCap, hwcap_CRC32)
    82		ARM64.HasATOMICS = isSet(HWCap, hwcap_ATOMICS)
    83		ARM64.HasFPHP = isSet(HWCap, hwcap_FPHP)
    84		ARM64.HasASIMDHP = isSet(HWCap, hwcap_ASIMDHP)
    85		ARM64.HasCPUID = isSet(HWCap, hwcap_CPUID)
    86		ARM64.HasASIMDRDM = isSet(HWCap, hwcap_ASIMDRDM)
    87		ARM64.HasJSCVT = isSet(HWCap, hwcap_JSCVT)
    88		ARM64.HasFCMA = isSet(HWCap, hwcap_FCMA)
    89		ARM64.HasLRCPC = isSet(HWCap, hwcap_LRCPC)
    90		ARM64.HasDCPOP = isSet(HWCap, hwcap_DCPOP)
    91		ARM64.HasSHA3 = isSet(HWCap, hwcap_SHA3)
    92		ARM64.HasSM3 = isSet(HWCap, hwcap_SM3)
    93		ARM64.HasSM4 = isSet(HWCap, hwcap_SM4)
    94		ARM64.HasASIMDDP = isSet(HWCap, hwcap_ASIMDDP)
    95		ARM64.HasSHA512 = isSet(HWCap, hwcap_SHA512)
    96		ARM64.HasSVE = isSet(HWCap, hwcap_SVE)
    97		ARM64.HasASIMDFHM = isSet(HWCap, hwcap_ASIMDFHM)
    98	}
    99	
   100	func isSet(hwc uint, value uint) bool {
   101		return hwc&value != 0
   102	}
   103	

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