mirror of
https://github.com/emmansun/gmsm.git
synced 2025-04-27 04:36:19 +08:00
66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
// 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.
|
|
|
|
package cpu
|
|
|
|
import (
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
// Minimal copy of functionality from x/sys/unix so the cpu package can call
|
|
// sysctl without depending on x/sys/unix.
|
|
|
|
const (
|
|
// From OpenBSD's sys/sysctl.h.
|
|
_CTL_MACHDEP = 7
|
|
|
|
// From OpenBSD's machine/cpu.h.
|
|
_CPU_ID_AA64ISAR0 = 2
|
|
_CPU_ID_AA64ISAR1 = 3
|
|
)
|
|
|
|
// Implemented in the runtime package (runtime/sys_openbsd3.go)
|
|
func syscall_syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
|
|
|
|
//go:linkname syscall_syscall6 syscall.syscall6
|
|
|
|
func sysctl(mib []uint32, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {
|
|
_, _, errno := syscall_syscall6(libc_sysctl_trampoline_addr, uintptr(unsafe.Pointer(&mib[0])), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
|
|
if errno != 0 {
|
|
return errno
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var libc_sysctl_trampoline_addr uintptr
|
|
|
|
//go:cgo_import_dynamic libc_sysctl sysctl "libc.so"
|
|
|
|
func sysctlUint64(mib []uint32) (uint64, bool) {
|
|
var out uint64
|
|
nout := unsafe.Sizeof(out)
|
|
if err := sysctl(mib, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0); err != nil {
|
|
return 0, false
|
|
}
|
|
return out, true
|
|
}
|
|
|
|
func doinit() {
|
|
setMinimalFeatures()
|
|
|
|
// Get ID_AA64ISAR0 and ID_AA64ISAR1 from sysctl.
|
|
isar0, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64ISAR0})
|
|
if !ok {
|
|
return
|
|
}
|
|
isar1, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64ISAR1})
|
|
if !ok {
|
|
return
|
|
}
|
|
parseARM64SystemRegisters(isar0, isar1, 0)
|
|
|
|
Initialized = true
|
|
}
|