Current File : //usr/lib/dracut/modules.d/99uefi-lib/uefi-lib.sh
#!/bin/bash
#
# Copyright 2013 Red Hat, Inc. All rights reserved.
# Copyright 2013 Harald Hoyer <harald@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
getbyte () {
local IFS= LC_CTYPE=C res c
read -r -n 1 -d '' c
res=$?
# the single quote in the argument of the printf
# yields the numeric value of $c (ASCII since LC_CTYPE=C)
[[ -n $c ]] && c=$(printf '%u' "'$c") || c=0
printf "$c"
return $res
}
getword () {
local b1 b2 val
b1=$(getbyte) || return 1
b2=$(getbyte) || return 1
(( val = b2 * 256 + b1 ))
echo $val
return 0
}
# Acpi(PNP0A08,0x0)/Pci(0x3,0x0)/Pci(0x0,0x0)/MAC(90E2BA265ED4,0x0)/Vlan(172)/Fibre(0x4EA06104A0CC0050,0x0)
uefi_device_path()
{
local IFS= LC_CTYPE=C res tt len type hextype first
first=1
while :; do
type=$(getbyte) || return 1
subtype=$(getbyte) || return 1
len=$(getword) || return 1
hextype=$(printf "%02x%02x" "$type" "$subtype")
if [[ $first == 1 ]]; then
first=0
elif [[ $hextype != "7fff" ]]; then
printf "/"
fi
case $hextype in
0101)
# PCI
tt=$(getword)
printf "PCI(0x%x,0x%x)" $(($tt / 256)) $(($tt & 255))
;;
0201)
# ACPI
printf "Acpi(0x%x,0x%x)" $(($(getword) + $(getword) * 65536)) $(($(getword) + $(getword) * 65536))
;;
0303)
# FIBRE
getword &>/dev/null
getword &>/dev/null
printf "Fibre(0x%x%x%x%x%x%x%x%x,0x%x)" \
$(getbyte) $(getbyte) $(getbyte) $(getbyte) \
$(getbyte) $(getbyte) $(getbyte) $(getbyte) \
$(( $(getword) + $(getword) * 65536 + 4294967296 * ( $(getword) + $(getword) * 65536 ) ))
;;
030b)
# MAC
printf "MAC(%02x%02x%02x%02x%02x%02x," $(getbyte) $(getbyte) $(getbyte) $(getbyte) $(getbyte) $(getbyte)
read -r -N 26 tt || return 1
printf "0x%x)" $(getbyte)
;;
0314)
# VLAN
printf "VLAN(%d)" $(getword)
;;
7fff)
# END
printf "\n"
return 0
;;
*)
printf "Unknown(Type:%d SubType:%d len=%d)" "$type" "$subtype" "$len"
read -r -N $(($len-4)) tt || return 1
;;
esac
done
}
get_fcoe_boot_mac()
{
data=${1:-/sys/firmware/efi/vars/FcoeBootDevice-a0ebca23-5f9c-447a-a268-22b6c158c2ac/data}
[ -f $data ] || return 1
local IFS= LC_CTYPE=C tt len type hextype
first=1
while :; do
type=$(getbyte) || return 1
subtype=$(getbyte) || return 1
len=$(getword) || return 1
hextype=$(printf "%02x%02x" "$type" "$subtype")
case $hextype in
030b)
# MAC
printf "%02x:%02x:%02x:%02x:%02x:%02x" $(getbyte) $(getbyte) $(getbyte) $(getbyte) $(getbyte) $(getbyte)
read -r -N 27 tt || return 1
;;
7fff)
# END
return 0
;;
*)
read -r -N $(($len-4)) tt || return 1
;;
esac
done < $data
}
get_fcoe_boot_vlan()
{
data=${1:-/sys/firmware/efi/vars/FcoeBootDevice-a0ebca23-5f9c-447a-a268-22b6c158c2ac/data}
[ -f $data ] || return 1
local IFS= LC_CTYPE=C tt len type hextype
first=1
while :; do
type=$(getbyte) || return 1
subtype=$(getbyte) || return 1
len=$(getword) || return 1
hextype=$(printf "%02x%02x" "$type" "$subtype")
case $hextype in
0314)
# VLAN
printf "%d" $(getword)
;;
7fff)
# END
return 0
;;
*)
read -r -N $(($len-4)) tt || return 1
;;
esac
done < $data
}
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