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// Copyright 2024 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.
// Minimal copy of x/sys/unix so the cpu package can make a
// system call on Darwin without depending on x/sys/unix.
//go:build darwin && amd64 && gc
package cpu
import (
"syscall"
"unsafe"
)
type _C_int int32
// adapted from unix.Uname() at x/sys/unix/syscall_darwin.go L419
func darwinOSRelease(release *[256]byte) error {
// from x/sys/unix/zerrors_openbsd_amd64.go
const (
CTL_KERN = 0x1
KERN_OSRELEASE = 0x2
)
mib := []_C_int{CTL_KERN, KERN_OSRELEASE}
n := unsafe.Sizeof(*release)
return sysctl(mib, &release[0], &n, nil, 0)
}
type Errno = syscall.Errno
var _zero uintptr // Single-word zero for use when we need a valid pointer to 0 bytes.
// from x/sys/unix/zsyscall_darwin_amd64.go L791-807
func sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) error {
var _p0 unsafe.Pointer
if len(mib) > 0 {
_p0 = unsafe.Pointer(&mib[0])
} else {
_p0 = unsafe.Pointer(&_zero)
}
if _, _, err := syscall_syscall6(
libc_sysctl_trampoline_addr,
uintptr(_p0),
uintptr(len(mib)),
uintptr(unsafe.Pointer(old)),
uintptr(unsafe.Pointer(oldlen)),
uintptr(unsafe.Pointer(new)),
uintptr(newlen),
); err != 0 {
return err
}
return nil
}
var libc_sysctl_trampoline_addr uintptr
// adapted from internal/cpu/cpu_arm64_darwin.go
func darwinSysctlEnabled(name []byte) bool {
out := int32(0)
nout := unsafe.Sizeof(out)
if ret := sysctlbyname(&name[0], (*byte)(unsafe.Pointer(&out)), &nout, nil, 0); ret != nil {
return false
}
return out > 0
}
//go:cgo_import_dynamic libc_sysctl sysctl "/usr/lib/libSystem.B.dylib"
var libc_sysctlbyname_trampoline_addr uintptr
// adapted from runtime/sys_darwin.go in the pattern of sysctl() above, as defined in x/sys/unix
func sysctlbyname(name *byte, old *byte, oldlen *uintptr, new *byte, newlen uintptr) error {
if _, _, err := syscall_syscall6(
libc_sysctlbyname_trampoline_addr,
uintptr(unsafe.Pointer(name)),
uintptr(unsafe.Pointer(old)),
uintptr(unsafe.Pointer(oldlen)),
uintptr(unsafe.Pointer(new)),
uintptr(newlen),
0,
); err != 0 {
return err
}
return nil
}
//go:cgo_import_dynamic libc_sysctlbyname sysctlbyname "/usr/lib/libSystem.B.dylib"
// Implemented in the runtime package (runtime/sys_darwin.go)
func syscall_syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
//go:linkname syscall_syscall6 syscall.syscall6