//
//go:nosplit
func netbsdMstart0() {
	st := stackt{ss_flags: _SS_DISABLE}
	sigaltstack(&st, nil)
	mstart0()
}

func osinit() {
	ncpu = getncpu()
	if physPageSize == 0 {
		physPageSize = getPageSize()
	}
	needSysmonWorkaround = getOSRev() < 902000000 // NetBSD 9.2
}

var urandom_dev = []byte("/dev/urandom\x00")

//go:nosplit
func readRandom(r []byte) int {

		// mlock the signal stack to work around a kernel bug where it may
		// SIGILL when the signal stack is not faulted in while a signal
		// arrives. See issue 42774.
		mlock(unsafe.Pointer(mp.gsignal.stack.hi-physPageSize), physPageSize)
	}
}

// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
	// iOS does not support alternate signal stack.

// None of the Go runtime is initialized.
//
//go:nosplit
//go:nowritebarrierrec
func libpreinit() {
	initsig(true)
}

func osinit() {
	ncpu = getncpu()
	if physPageSize == 0 {
		physPageSize = getPageSize()
	}
}

var urandom_dev = []byte("/dev/urandom\x00")

//go:nosplit
func readRandom(r []byte) int {
	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)

	// Call miniterrno so that we can safely make system calls
	// before calling minit on m0.
	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))

	ncpu = getncpu()
	if physPageSize == 0 {
		physPageSize = getPageSize()
	}
}

func tstart_sysvicall(newm *m) uint32

// May run with m.p==nil, so write barriers are not allowed.
//
//go:nowritebarrier
func newosproc(mp *m) {
	var (

			return
		}
		var n uintptr
		for n = 4 << 10; n < size; n <<= 1 {
			err := mincore(unsafe.Pointer(uintptr(p)+n), 1, &addrspace_vec[0])
			if err == 0 {
				physPageSize = n
				break
			}
		}
		if physPageSize == 0 {
			physPageSize = size
		}
		munmap(p, size)
		return
	}

	n = read(fd, noescape(unsafe.Pointer(&auxvreadbuf[0])), int32(unsafe.Sizeof(auxvreadbuf)))
	closefd(fd)
	if n < 0 {

	if GOOS == "openbsd" && testing.Short() {
		t.Skip("skipping because virtual memory is limited; see #36210")
	}
	type test struct {
		request, expect uintptr
	}
	minPages := PhysPageSize / PageSize
	if minPages < 1 {
		minPages = 1
	}
	type setup struct {
		beforeAlloc map[ChunkIdx][]BitRange
		beforeScav  map[ChunkIdx][]BitRange
		expect      []test

	if hint.down {
		start, end = addr-heapArenaBytes, addr
		addr -= physPageSize
	} else {
		start, end = addr, addr+heapArenaBytes
	}
	got := sysReserve(unsafe.Pointer(addr), physPageSize)
	ok = (addr == uintptr(got))
	if !ok {
		// We were unable to get the requested reservation.
		// Release what we did get and fail.
		sysFreeOS(got, physPageSize)
	}
	return
}

func GetNextArenaHint() uintptr {

		// This test is similar to the one with the same name for
		// pageAlloc.alloc and serves the same purpose.
		// See mpagealloc_test.go for details.
		sumsPerPhysPage := ChunkIdx(PhysPageSize / PallocSumBytes)
		baseChunkIdx := BaseChunkIdx &^ (sumsPerPhysPage - 1)
		tests["DiscontiguousMappedSumBoundary"] = test{
			beforeAlloc: map[ChunkIdx][]BitRange{

		// We're assuming here we can read at least the page containing the PC.
		// I suppose it is possible that the page is mapped executable but not readable?
		pc := c.sigpc()
		if n > physPageSize-pc%physPageSize {
			n = physPageSize - pc%physPageSize
		}
		print("instruction bytes:")
		b := (*[maxN]byte)(unsafe.Pointer(pc))
		for i := uintptr(0); i < n; i++ {
			print(" ", hex(b[i]))
		}
		println()
	}
	print("\n")

//go:linkname syscall_runtime_envs syscall.runtime_envs
func syscall_runtime_envs() []string { return append([]string{}, envs...) }

//go:linkname syscall_Getpagesize syscall.Getpagesize
func syscall_Getpagesize() int { return int(physPageSize) }

//go:linkname os_runtime_args os.runtime_args
func os_runtime_args() []string { return append([]string{}, argslice...) }

//go:linkname syscall_Exit syscall.Exit
//go:nosplit