gitlab.com/apertussolutions/u-root@v7.0.0+incompatible/cmds/core/io/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 main
     8  
     9  import (
    10  	"fmt"
    11  
    12  	"github.com/u-root/u-root/pkg/cmos"
    13  	"github.com/u-root/u-root/pkg/memio"
    14  )
    15  
    16  func init() {
    17  	usageMsg += `io (cr index)... # read from CMOS register index [14-127]
    18  io (cw index value)... # write value to CMOS register index [14-127]
    19  io (rtcr index)... # read from RTC register index [0-13]
    20  io (rtcw index value)... # write value to RTC register index [0-13]
    21  `
    22  	addCmd(readCmds, "cr", &cmd{cmosRead, 7, 8})
    23  	addCmd(readCmds, "rtcr", &cmd{rtcRead, 7, 8})
    24  	addCmd(writeCmds, "cw", &cmd{cmosWrite, 7, 8})
    25  	addCmd(writeCmds, "rtcw", &cmd{rtcWrite, 7, 8})
    26  }
    27  
    28  func cmosRead(reg int64, data memio.UintN) error {
    29  	regVal := memio.Uint8(reg)
    30  	if regVal < 14 {
    31  		return fmt.Errorf("byte %d is inside the range 0-13 which is reserved for RTC", regVal)
    32  	}
    33  	return cmos.Read(regVal, data)
    34  }
    35  
    36  func cmosWrite(reg int64, data memio.UintN) error {
    37  	regVal := memio.Uint8(reg)
    38  	if regVal < 14 {
    39  		return fmt.Errorf("byte %d is inside the range 0-13 which is reserved for RTC", regVal)
    40  	}
    41  	return cmos.Write(regVal, data)
    42  }
    43  
    44  func rtcRead(reg int64, data memio.UintN) error {
    45  	regVal := memio.Uint8(reg)
    46  	if regVal > 13 {
    47  		return fmt.Errorf("byte %d is outside the range 0-13 reserved for RTC", regVal)
    48  	}
    49  	return cmos.Read(regVal, data)
    50  }
    51  
    52  func rtcWrite(reg int64, data memio.UintN) error {
    53  	regVal := memio.Uint8(reg)
    54  	if regVal > 13 {
    55  		return fmt.Errorf("byte %d is outside the range 0-13 reserved for RTC", regVal)
    56  	}
    57  	return cmos.Write(regVal, data)
    58  }