1 files changed, 130 insertions, 0 deletions

diff --git a/vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go b/vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go
new file mode 100644
index 0000000..ee278b9
--- /dev/null
+++ b/vendor/github.com/klauspost/cpuid/v2/os_linux_arm64.go
@@ -0,0 +1,130 @@
+// Copyright (c) 2020 Klaus Post, released under MIT License. See LICENSE file.
+
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file located
+// here https://github.com/golang/sys/blob/master/LICENSE
+
+package cpuid
+
+import (
+        "encoding/binary"
+        "io/ioutil"
+        "runtime"
+)
+
+// HWCAP bits.
+const (
+        hwcap_FP       = 1 << 0
+        hwcap_ASIMD    = 1 << 1
+        hwcap_EVTSTRM  = 1 << 2
+        hwcap_AES      = 1 << 3
+        hwcap_PMULL    = 1 << 4
+        hwcap_SHA1     = 1 << 5
+        hwcap_SHA2     = 1 << 6
+        hwcap_CRC32    = 1 << 7
+        hwcap_ATOMICS  = 1 << 8
+        hwcap_FPHP     = 1 << 9
+        hwcap_ASIMDHP  = 1 << 10
+        hwcap_CPUID    = 1 << 11
+        hwcap_ASIMDRDM = 1 << 12
+        hwcap_JSCVT    = 1 << 13
+        hwcap_FCMA     = 1 << 14
+        hwcap_LRCPC    = 1 << 15
+        hwcap_DCPOP    = 1 << 16
+        hwcap_SHA3     = 1 << 17
+        hwcap_SM3      = 1 << 18
+        hwcap_SM4      = 1 << 19
+        hwcap_ASIMDDP  = 1 << 20
+        hwcap_SHA512   = 1 << 21
+        hwcap_SVE      = 1 << 22
+        hwcap_ASIMDFHM = 1 << 23
+)
+
+func detectOS(c *CPUInfo) bool {
+        // For now assuming no hyperthreading is reasonable.
+        c.LogicalCores = runtime.NumCPU()
+        c.PhysicalCores = c.LogicalCores
+        c.ThreadsPerCore = 1
+        if hwcap == 0 {
+                // We did not get values from the runtime.
+                // Try reading /proc/self/auxv
+
+                // From https://github.com/golang/sys
+                const (
+                        _AT_HWCAP  = 16
+                        _AT_HWCAP2 = 26
+
+                        uintSize = int(32 << (^uint(0) >> 63))
+                )
+
+                buf, err := ioutil.ReadFile("/proc/self/auxv")
+                if err != nil {
+                        // e.g. on android /proc/self/auxv is not accessible, so silently
+                        // ignore the error and leave Initialized = false. On some
+                        // architectures (e.g. arm64) doinit() implements a fallback
+                        // readout and will set Initialized = true again.
+                        return false
+                }
+                bo := binary.LittleEndian
+                for len(buf) >= 2*(uintSize/8) {
+                        var tag, val uint
+                        switch uintSize {
+                        case 32:
+                                tag = uint(bo.Uint32(buf[0:]))
+                                val = uint(bo.Uint32(buf[4:]))
+                                buf = buf[8:]
+                        case 64:
+                                tag = uint(bo.Uint64(buf[0:]))
+                                val = uint(bo.Uint64(buf[8:]))
+                                buf = buf[16:]
+                        }
+                        switch tag {
+                        case _AT_HWCAP:
+                                hwcap = val
+                        case _AT_HWCAP2:
+                                // Not used
+                        }
+                }
+                if hwcap == 0 {
+                        return false
+                }
+        }
+
+        // HWCap was populated by the runtime from the auxiliary vector.
+        // Use HWCap information since reading aarch64 system registers
+        // is not supported in user space on older linux kernels.
+        c.featureSet.setIf(isSet(hwcap, hwcap_AES), AESARM)
+        c.featureSet.setIf(isSet(hwcap, hwcap_ASIMD), ASIMD)
+        c.featureSet.setIf(isSet(hwcap, hwcap_ASIMDDP), ASIMDDP)
+        c.featureSet.setIf(isSet(hwcap, hwcap_ASIMDHP), ASIMDHP)
+        c.featureSet.setIf(isSet(hwcap, hwcap_ASIMDRDM), ASIMDRDM)
+        c.featureSet.setIf(isSet(hwcap, hwcap_CPUID), ARMCPUID)
+        c.featureSet.setIf(isSet(hwcap, hwcap_CRC32), CRC32)
+        c.featureSet.setIf(isSet(hwcap, hwcap_DCPOP), DCPOP)
+        c.featureSet.setIf(isSet(hwcap, hwcap_EVTSTRM), EVTSTRM)
+        c.featureSet.setIf(isSet(hwcap, hwcap_FCMA), FCMA)
+        c.featureSet.setIf(isSet(hwcap, hwcap_FP), FP)
+        c.featureSet.setIf(isSet(hwcap, hwcap_FPHP), FPHP)
+        c.featureSet.setIf(isSet(hwcap, hwcap_JSCVT), JSCVT)
+        c.featureSet.setIf(isSet(hwcap, hwcap_LRCPC), LRCPC)
+        c.featureSet.setIf(isSet(hwcap, hwcap_PMULL), PMULL)
+        c.featureSet.setIf(isSet(hwcap, hwcap_SHA1), SHA1)
+        c.featureSet.setIf(isSet(hwcap, hwcap_SHA2), SHA2)
+        c.featureSet.setIf(isSet(hwcap, hwcap_SHA3), SHA3)
+        c.featureSet.setIf(isSet(hwcap, hwcap_SHA512), SHA512)
+        c.featureSet.setIf(isSet(hwcap, hwcap_SM3), SM3)
+        c.featureSet.setIf(isSet(hwcap, hwcap_SM4), SM4)
+        c.featureSet.setIf(isSet(hwcap, hwcap_SVE), SVE)
+
+        // The Samsung S9+ kernel reports support for atomics, but not all cores
+        // actually support them, resulting in SIGILL. See issue #28431.
+        // TODO(elias.naur): Only disable the optimization on bad chipsets on android.
+        c.featureSet.setIf(isSet(hwcap, hwcap_ATOMICS) && runtime.GOOS != "android", ATOMICS)
+
+        return true
+}
+
+func isSet(hwc uint, value uint) bool {
+        return hwc&value != 0
+}