Make Nix builds work

1 files changed, 71 insertions, 0 deletions

diff --git a/vendor/golang.org/x/sys/cpu/hwcap_linux.go b/vendor/golang.org/x/sys/cpu/hwcap_linux.go
new file mode 100644
index 0000000..34e49f9
--- /dev/null
+++ b/vendor/golang.org/x/sys/cpu/hwcap_linux.go
@@ -0,0 +1,71 @@
+// Copyright 2019 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.
+
+package cpu
+
+import (
+        "os"
+)
+
+const (
+        _AT_HWCAP  = 16
+        _AT_HWCAP2 = 26
+
+        procAuxv = "/proc/self/auxv"
+
+        uintSize = int(32 << (^uint(0) >> 63))
+)
+
+// For those platforms don't have a 'cpuid' equivalent we use HWCAP/HWCAP2
+// These are initialized in cpu_$GOARCH.go
+// and should not be changed after they are initialized.
+var hwCap uint
+var hwCap2 uint
+
+func readHWCAP() error {
+        // For Go 1.21+, get auxv from the Go runtime.
+        if a := getAuxv(); len(a) > 0 {
+                for len(a) >= 2 {
+                        tag, val := a[0], uint(a[1])
+                        a = a[2:]
+                        switch tag {
+                        case _AT_HWCAP:
+                                hwCap = val
+                        case _AT_HWCAP2:
+                                hwCap2 = val
+                        }
+                }
+                return nil
+        }
+
+        buf, err := os.ReadFile(procAuxv)
+        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 err
+        }
+        bo := hostByteOrder()
+        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:
+                        hwCap2 = val
+                }
+        }
+        return nil
+}