mirror of
https://github.com/rwinkhart/sys.git
synced 2026-08-28 04:46:44 -04:00
Egon Elbre
942780bbc1
The ARM64 flags were not being correctly set for Mac M series laptops. Fixes golang/go#43046 Change-Id: I1d884dccd3f3a0a010ad7babbab26b73731ab583 Reviewed-on: https://go-review.googlesource.com/c/sys/+/737260 Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com>
55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Minimal copy from internal/cpu and runtime to make sysctl calls.
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//go:build darwin && arm64 && gc
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package cpu
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import (
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"syscall"
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"unsafe"
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)
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type Errno = syscall.Errno
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// adapted from internal/cpu/cpu_arm64_darwin.go
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func darwinSysctlEnabled(name []byte) bool {
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out := int32(0)
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nout := unsafe.Sizeof(out)
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if ret := sysctlbyname(&name[0], (*byte)(unsafe.Pointer(&out)), &nout, nil, 0); ret != nil {
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return false
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}
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return out > 0
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}
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//go:cgo_import_dynamic libc_sysctl sysctl "/usr/lib/libSystem.B.dylib"
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var libc_sysctlbyname_trampoline_addr uintptr
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// adapted from runtime/sys_darwin.go in the pattern of sysctl() above, as defined in x/sys/unix
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func sysctlbyname(name *byte, old *byte, oldlen *uintptr, new *byte, newlen uintptr) error {
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if _, _, err := syscall_syscall6(
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libc_sysctlbyname_trampoline_addr,
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uintptr(unsafe.Pointer(name)),
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uintptr(unsafe.Pointer(old)),
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uintptr(unsafe.Pointer(oldlen)),
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uintptr(unsafe.Pointer(new)),
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uintptr(newlen),
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0,
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); err != 0 {
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return err
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}
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return nil
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}
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//go:cgo_import_dynamic libc_sysctlbyname sysctlbyname "/usr/lib/libSystem.B.dylib"
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// Implemented in the runtime package (runtime/sys_darwin.go)
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func syscall_syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
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//go:linkname syscall_syscall6 syscall.syscall6
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