1 // Copyright 2017 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.
5 // Functions to access/create device major and minor numbers matching the
6 // encoding used in NetBSD's sys/types.h header.
10 // Major returns the major component of a NetBSD device number.
11 func Major(dev uint64) uint32 {
12 return uint32((dev & 0x000fff00) >> 8)
15 // Minor returns the minor component of a NetBSD device number.
16 func Minor(dev uint64) uint32 {
17 minor := uint32((dev & 0x000000ff) >> 0)
18 minor |= uint32((dev & 0xfff00000) >> 12)
22 // Mkdev returns a NetBSD device number generated from the given major and minor
24 func Mkdev(major, minor uint32) uint64 {
25 dev := (uint64(major) << 8) & 0x000fff00
26 dev |= (uint64(minor) << 12) & 0xfff00000
27 dev |= (uint64(minor) << 0) & 0x000000ff