github.com/Andyfoo/golang/x/sys@v0.0.0-20190901054642-57c1bf301704/unix/dev_aix_ppc64.go (about)

     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  }