Make Nix builds work

1 files changed, 53 insertions, 0 deletions

diff --git a/vendor/golang.org/x/sys/cpu/proc_cpuinfo_linux.go b/vendor/golang.org/x/sys/cpu/proc_cpuinfo_linux.go
new file mode 100644
index 0000000..4cd64c7
--- /dev/null
+++ b/vendor/golang.org/x/sys/cpu/proc_cpuinfo_linux.go
@@ -0,0 +1,53 @@
+// Copyright 2022 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.
+
+//go:build linux && arm64
+
+package cpu
+
+import (
+        "errors"
+        "io"
+        "os"
+        "strings"
+)
+
+func readLinuxProcCPUInfo() error {
+        f, err := os.Open("/proc/cpuinfo")
+        if err != nil {
+                return err
+        }
+        defer f.Close()
+
+        var buf [1 << 10]byte // enough for first CPU
+        n, err := io.ReadFull(f, buf[:])
+        if err != nil && err != io.ErrUnexpectedEOF {
+                return err
+        }
+        in := string(buf[:n])
+        const features = "\nFeatures    : "
+        i := strings.Index(in, features)
+        if i == -1 {
+                return errors.New("no CPU features found")
+        }
+        in = in[i+len(features):]
+        if i := strings.Index(in, "\n"); i != -1 {
+                in = in[:i]
+        }
+        m := map[string]*bool{}
+
+        initOptions() // need it early here; it's harmless to call twice
+        for _, o := range options {
+                m[o.Name] = o.Feature
+        }
+        // The EVTSTRM field has alias "evstrm" in Go, but Linux calls it "evtstrm".
+        m["evtstrm"] = &ARM64.HasEVTSTRM
+
+        for _, f := range strings.Fields(in) {
+                if p, ok := m[f]; ok {
+                        *p = true
+                }
+        }
+        return nil
+}