gtsocial-umbx

Unnamed repository; edit this file 'description' to name the repository.
Log | Files | Refs | README | LICENSE

cpu_arm64.go (3767B)

      1 // Copyright 2019 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 import "runtime"
      8 
      9 // cacheLineSize is used to prevent false sharing of cache lines.
     10 // We choose 128 because Apple Silicon, a.k.a. M1, has 128-byte cache line size.
     11 // It doesn't cost much and is much more future-proof.
     12 const cacheLineSize = 128
     13 
     14 func initOptions() {
     15 	options = []option{
     16 		{Name: "fp", Feature: &ARM64.HasFP},
     17 		{Name: "asimd", Feature: &ARM64.HasASIMD},
     18 		{Name: "evstrm", Feature: &ARM64.HasEVTSTRM},
     19 		{Name: "aes", Feature: &ARM64.HasAES},
     20 		{Name: "fphp", Feature: &ARM64.HasFPHP},
     21 		{Name: "jscvt", Feature: &ARM64.HasJSCVT},
     22 		{Name: "lrcpc", Feature: &ARM64.HasLRCPC},
     23 		{Name: "pmull", Feature: &ARM64.HasPMULL},
     24 		{Name: "sha1", Feature: &ARM64.HasSHA1},
     25 		{Name: "sha2", Feature: &ARM64.HasSHA2},
     26 		{Name: "sha3", Feature: &ARM64.HasSHA3},
     27 		{Name: "sha512", Feature: &ARM64.HasSHA512},
     28 		{Name: "sm3", Feature: &ARM64.HasSM3},
     29 		{Name: "sm4", Feature: &ARM64.HasSM4},
     30 		{Name: "sve", Feature: &ARM64.HasSVE},
     31 		{Name: "crc32", Feature: &ARM64.HasCRC32},
     32 		{Name: "atomics", Feature: &ARM64.HasATOMICS},
     33 		{Name: "asimdhp", Feature: &ARM64.HasASIMDHP},
     34 		{Name: "cpuid", Feature: &ARM64.HasCPUID},
     35 		{Name: "asimrdm", Feature: &ARM64.HasASIMDRDM},
     36 		{Name: "fcma", Feature: &ARM64.HasFCMA},
     37 		{Name: "dcpop", Feature: &ARM64.HasDCPOP},
     38 		{Name: "asimddp", Feature: &ARM64.HasASIMDDP},
     39 		{Name: "asimdfhm", Feature: &ARM64.HasASIMDFHM},
     40 	}
     41 }
     42 
     43 func archInit() {
     44 	switch runtime.GOOS {
     45 	case "freebsd":
     46 		readARM64Registers()
     47 	case "linux", "netbsd", "openbsd":
     48 		doinit()
     49 	default:
     50 		// Many platforms don't seem to allow reading these registers.
     51 		setMinimalFeatures()
     52 	}
     53 }
     54 
     55 // setMinimalFeatures fakes the minimal ARM64 features expected by
     56 // TestARM64minimalFeatures.
     57 func setMinimalFeatures() {
     58 	ARM64.HasASIMD = true
     59 	ARM64.HasFP = true
     60 }
     61 
     62 func readARM64Registers() {
     63 	Initialized = true
     64 
     65 	parseARM64SystemRegisters(getisar0(), getisar1(), getpfr0())
     66 }
     67 
     68 func parseARM64SystemRegisters(isar0, isar1, pfr0 uint64) {
     69 	// ID_AA64ISAR0_EL1
     70 	switch extractBits(isar0, 4, 7) {
     71 	case 1:
     72 		ARM64.HasAES = true
     73 	case 2:
     74 		ARM64.HasAES = true
     75 		ARM64.HasPMULL = true
     76 	}
     77 
     78 	switch extractBits(isar0, 8, 11) {
     79 	case 1:
     80 		ARM64.HasSHA1 = true
     81 	}
     82 
     83 	switch extractBits(isar0, 12, 15) {
     84 	case 1:
     85 		ARM64.HasSHA2 = true
     86 	case 2:
     87 		ARM64.HasSHA2 = true
     88 		ARM64.HasSHA512 = true
     89 	}
     90 
     91 	switch extractBits(isar0, 16, 19) {
     92 	case 1:
     93 		ARM64.HasCRC32 = true
     94 	}
     95 
     96 	switch extractBits(isar0, 20, 23) {
     97 	case 2:
     98 		ARM64.HasATOMICS = true
     99 	}
    100 
    101 	switch extractBits(isar0, 28, 31) {
    102 	case 1:
    103 		ARM64.HasASIMDRDM = true
    104 	}
    105 
    106 	switch extractBits(isar0, 32, 35) {
    107 	case 1:
    108 		ARM64.HasSHA3 = true
    109 	}
    110 
    111 	switch extractBits(isar0, 36, 39) {
    112 	case 1:
    113 		ARM64.HasSM3 = true
    114 	}
    115 
    116 	switch extractBits(isar0, 40, 43) {
    117 	case 1:
    118 		ARM64.HasSM4 = true
    119 	}
    120 
    121 	switch extractBits(isar0, 44, 47) {
    122 	case 1:
    123 		ARM64.HasASIMDDP = true
    124 	}
    125 
    126 	// ID_AA64ISAR1_EL1
    127 	switch extractBits(isar1, 0, 3) {
    128 	case 1:
    129 		ARM64.HasDCPOP = true
    130 	}
    131 
    132 	switch extractBits(isar1, 12, 15) {
    133 	case 1:
    134 		ARM64.HasJSCVT = true
    135 	}
    136 
    137 	switch extractBits(isar1, 16, 19) {
    138 	case 1:
    139 		ARM64.HasFCMA = true
    140 	}
    141 
    142 	switch extractBits(isar1, 20, 23) {
    143 	case 1:
    144 		ARM64.HasLRCPC = true
    145 	}
    146 
    147 	// ID_AA64PFR0_EL1
    148 	switch extractBits(pfr0, 16, 19) {
    149 	case 0:
    150 		ARM64.HasFP = true
    151 	case 1:
    152 		ARM64.HasFP = true
    153 		ARM64.HasFPHP = true
    154 	}
    155 
    156 	switch extractBits(pfr0, 20, 23) {
    157 	case 0:
    158 		ARM64.HasASIMD = true
    159 	case 1:
    160 		ARM64.HasASIMD = true
    161 		ARM64.HasASIMDHP = true
    162 	}
    163 
    164 	switch extractBits(pfr0, 32, 35) {
    165 	case 1:
    166 		ARM64.HasSVE = true
    167 	}
    168 }
    169 
    170 func extractBits(data uint64, start, end uint) uint {
    171 	return (uint)(data>>start) & ((1 << (end - start + 1)) - 1)
    172 }