1// Copyright 2018 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
5//go:build aix && ppc64
6
7// Functions to access/create device major and minor numbers matching the
8// encoding used AIX.
9
10package unix
11
12// Major returns the major component of a Linux device number.
13func Major(dev uint64) uint32 {
14	return uint32((dev & 0x3fffffff00000000) >> 32)
15}
16
17// Minor returns the minor component of a Linux device number.
18func Minor(dev uint64) uint32 {
19	return uint32((dev & 0x00000000ffffffff) >> 0)
20}
21
22// Mkdev returns a Linux device number generated from the given major and minor
23// components.
24func Mkdev(major, minor uint32) uint64 {
25	var DEVNO64 uint64
26	DEVNO64 = 0x8000000000000000
27	return ((uint64(major) << 32) | (uint64(minor) & 0x00000000FFFFFFFF) | DEVNO64)
28}
29