a geicko-2 based round robin ranking system designed to test c++ battleship submissions
battleship.dunkirk.sh
dunkirk.sh
1// Copyright 2022 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package cpu
6
7import (
8 "syscall"
9 "unsafe"
10)
11
12// Minimal copy of functionality from x/sys/unix so the cpu package can call
13// sysctl without depending on x/sys/unix.
14
15const (
16 // From OpenBSD's sys/sysctl.h.
17 _CTL_MACHDEP = 7
18
19 // From OpenBSD's machine/cpu.h.
20 _CPU_ID_AA64ISAR0 = 2
21 _CPU_ID_AA64ISAR1 = 3
22)
23
24// Implemented in the runtime package (runtime/sys_openbsd3.go)
25func syscall_syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
26
27//go:linkname syscall_syscall6 syscall.syscall6
28
29func sysctl(mib []uint32, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {
30 _, _, 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))
31 if errno != 0 {
32 return errno
33 }
34 return nil
35}
36
37var libc_sysctl_trampoline_addr uintptr
38
39//go:cgo_import_dynamic libc_sysctl sysctl "libc.so"
40
41func sysctlUint64(mib []uint32) (uint64, bool) {
42 var out uint64
43 nout := unsafe.Sizeof(out)
44 if err := sysctl(mib, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0); err != nil {
45 return 0, false
46 }
47 return out, true
48}
49
50func doinit() {
51 setMinimalFeatures()
52
53 // Get ID_AA64ISAR0 and ID_AA64ISAR1 from sysctl.
54 isar0, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64ISAR0})
55 if !ok {
56 return
57 }
58 isar1, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64ISAR1})
59 if !ok {
60 return
61 }
62 parseARM64SystemRegisters(isar0, isar1, 0)
63
64 Initialized = true
65}