| Don Newton | 98fd881 | 2019-09-23 15:15:02 -0400 | [diff] [blame] | 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 | // +build aix |
| 6 | // +build ppc64 |
| 7 | |
| 8 | // Functions to access/create device major and minor numbers matching the |
| 9 | // encoding used AIX. |
| 10 | |
| 11 | package unix |
| 12 | |
| 13 | // Major returns the major component of a Linux device number. |
| 14 | func Major(dev uint64) uint32 { |
| 15 | return uint32((dev & 0x3fffffff00000000) >> 32) |
| 16 | } |
| 17 | |
| 18 | // Minor returns the minor component of a Linux device number. |
| 19 | func Minor(dev uint64) uint32 { |
| 20 | return uint32((dev & 0x00000000ffffffff) >> 0) |
| 21 | } |
| 22 | |
| 23 | // Mkdev returns a Linux device number generated from the given major and minor |
| 24 | // components. |
| 25 | func Mkdev(major, minor uint32) uint64 { |
| 26 | var DEVNO64 uint64 |
| 27 | DEVNO64 = 0x8000000000000000 |
| 28 | return ((uint64(major) << 32) | (uint64(minor) & 0x00000000FFFFFFFF) | DEVNO64) |
| 29 | } |