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// Copyright 2021 Canonical Ltd.
// Licensed under the LGPLv3 with static-linking exception.
// See LICENCE file for details.
package linux
import (
"errors"
"fmt"
"math"
efi "github.com/canonical/go-efilib"
)
func handleIDEDevicePathNode(state *devicePathBuilderState) error {
if state.SysfsComponentsRemaining() < 6 {
return errors.New("invalid path: insufficient components")
}
state.AdvanceSysfsPath(6)
params, err := handleATAPath(state.SysfsPath())
if err != nil {
return err
}
// PATA has a maximum of 2 ports.
if params.port < 1 || params.port > 2 {
return fmt.Errorf("invalid port: %d", params.port)
}
// Each PATA device is represented in the SCSI layer by setting the
// target to the drive number, and the LUN as the LUN (see
// drivers/ata/libata-scsi.c:ata_scsi_scan_host).
// The channel is always 0 for PATA devices (no port multiplier).
if params.channel != 0 {
return errors.New("invalid SCSI channel")
}
if params.target > 1 {
return errors.New("invalid drive")
}
if params.lun > math.MaxUint16 {
return errors.New("invalid LUN")
}
state.Path = append(state.Path, &efi.ATAPIDevicePathNode{
Controller: efi.ATAPIControllerRole(params.port - 1),
Drive: efi.ATAPIDriveRole(params.target),
LUN: uint16(params.lun)})
return nil
}
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