modules.d/99uefi-lib/uefi-lib.sh

   1 #!/bin/bash
   2 #
   3 # Copyright 2013 Red Hat, Inc.  All rights reserved.
   4 # Copyright 2013 Harald Hoyer <harald@redhat.com>
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 #
  19
  20 getbyte () {
  21     local IFS= LC_CTYPE=C res c
  22     read -r -n 1 -d '' c
  23     res=$?
  24     # the single quote in the argument of the printf
  25     # yields the numeric value of $c (ASCII since LC_CTYPE=C)
  26     [[ -n $c ]] && c=$(printf '%u' "'$c") || c=0
  27     printf "$c"
  28     return $res
  29 }
  30
  31 getword () {
  32     local b1 b2 val
  33     b1=$(getbyte) || return 1
  34     b2=$(getbyte) || return 1
  35     (( val = b2 * 256 + b1 ))
  36     echo $val
  37     return 0
  38 }
  39
  40 # Acpi(PNP0A08,0x0)/Pci(0x3,0x0)/Pci(0x0,0x0)/MAC(90E2BA265ED4,0x0)/Vlan(172)/Fibre(0x4EA06104A0CC0050,0x0)
  41 uefi_device_path()
  42 {
  43     local IFS= LC_CTYPE=C res tt len type hextype first
  44     first=1
  45
  46     while :; do
  47         type=$(getbyte) || return 1
  48         subtype=$(getbyte) || return 1
  49         len=$(getword) || return 1
  50         hextype=$(printf "%02x%02x" "$type" "$subtype")
  51         if [[ $first == 1 ]]; then
  52             first=0
  53         elif [[ $hextype != "7fff" ]]; then
  54             printf "/"
  55         fi
  56         case $hextype in
  57             0101)
  58                 # PCI
  59                 tt=$(getword)
  60                 printf "PCI(0x%x,0x%x)" $(($tt / 256)) $(($tt & 255))
  61                 ;;
  62             0201)
  63                 # ACPI
  64                 printf "Acpi(0x%x,0x%x)" $(($(getword) + $(getword) * 65536)) $(($(getword) + $(getword) * 65536))
  65                 ;;
  66             0303)
  67                 # FIBRE
  68                 getword &>/dev/null
  69                 getword &>/dev/null
  70                 printf "Fibre(0x%x%x%x%x%x%x%x%x,0x%x)" \
  71                     $(getbyte) $(getbyte) $(getbyte) $(getbyte) \
  72                     $(getbyte) $(getbyte) $(getbyte) $(getbyte) \
  73                     $(( $(getword) + $(getword) * 65536 + 4294967296 * ( $(getword) + $(getword) * 65536 ) ))
  74                 ;;
  75             030b)
  76                 # MAC
  77                 printf "MAC(%02x%02x%02x%02x%02x%02x," $(getbyte) $(getbyte) $(getbyte) $(getbyte) $(getbyte) $(getbyte)
  78                 read -r -N 26  tt || return 1
  79                 printf "0x%x)"  $(getbyte)
  80                 ;;
  81             0314)
  82                 # VLAN
  83                 printf "VLAN(%d)" $(getword)
  84                 ;;
  85             7fff)
  86                 # END
  87                 printf "\n"
  88                 return 0
  89                 ;;
  90             *)
  91                 printf "Unknown(Type:%d SubType:%d len=%d)" "$type" "$subtype" "$len"
  92                 read -r -N $(($len-4))  tt || return 1
  93                 ;;
  94         esac
  95     done
  96 }
  97
  98 get_fcoe_boot_mac()
  99 {
 100     data=${1:-/sys/firmware/efi/vars/FcoeBootDevice-a0ebca23-5f9c-447a-a268-22b6c158c2ac/data}
 101     [ -f $data ] || return 1
 102     local IFS= LC_CTYPE=C tt len type hextype
 103     first=1
 104
 105     while :; do
 106         type=$(getbyte) || return 1
 107         subtype=$(getbyte) || return 1
 108         len=$(getword) || return 1
 109         hextype=$(printf "%02x%02x" "$type" "$subtype")
 110         case $hextype in
 111             030b)
 112                 # MAC
 113                 printf "%02x:%02x:%02x:%02x:%02x:%02x" $(getbyte) $(getbyte) $(getbyte) $(getbyte) $(getbyte) $(getbyte)
 114                 read -r -N 27  tt || return 1
 115                 ;;
 116             7fff)
 117                 # END
 118                 return 0
 119                 ;;
 120             *)
 121                 read -r -N $(($len-4))  tt || return 1
 122                 ;;
 123         esac
 124     done < $data
 125 }
 126
 127 get_fcoe_boot_vlan()
 128 {
 129     data=${1:-/sys/firmware/efi/vars/FcoeBootDevice-a0ebca23-5f9c-447a-a268-22b6c158c2ac/data}
 130     [ -f $data ] || return 1
 131     local IFS= LC_CTYPE=C tt len type hextype
 132     first=1
 133
 134     while :; do
 135         type=$(getbyte) || return 1
 136         subtype=$(getbyte) || return 1
 137         len=$(getword) || return 1
 138         hextype=$(printf "%02x%02x" "$type" "$subtype")
 139         case $hextype in
 140             0314)
 141                 # VLAN
 142                 printf "%d" $(getword)
 143                 ;;
 144             7fff)
 145                 # END
 146                 return 0
 147                 ;;
 148             *)
 149                 read -r -N $(($len-4))  tt || return 1
 150                 ;;
 151         esac
 152     done < $data
 153 }