github.com/u-root/u-root@v7.0.1-0.20200915234505-ad7babab0a8e+incompatible/pkg/cmos/cmos.go (about)

     1  // Copyright 2012-2020 the u-root 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 amd64 386
     6  
     7  package cmos
     8  
     9  import (
    10  	"github.com/u-root/u-root/pkg/memio"
    11  )
    12  
    13  const (
    14  	cmosRegPort  = 0x70
    15  	cmosDataPort = 0x71
    16  )
    17  
    18  // Read reads a register reg from CMOS into data.
    19  func Read(reg memio.Uint8, data memio.UintN) error {
    20  	if err := memio.Out(cmosRegPort, &reg); err != nil {
    21  		return err
    22  	}
    23  	return memio.In(cmosDataPort, data)
    24  }
    25  
    26  // Write writes value data into CMOS register reg.
    27  func Write(reg memio.Uint8, data memio.UintN) error {
    28  	if err := memio.Out(cmosRegPort, &reg); err != nil {
    29  		return err
    30  	}
    31  	return memio.Out(cmosDataPort, data)
    32  }