Current File : //usr/share/initramfs-tools/hooks/intel_microcode
#!/bin/sh
# intel-microcode initramfs-tools hook script version 3
# Copyright (C) 2012-2016 Henrique de Moraes Holschuh <hmh@debian.org>
# Released under the GNU GPL v2 or later license
#
# Generates a copy of the Intel microcode (by default tailored to the
# running system), and installs it in the early initramfs.
#
# iucode_tool v1.0 or later is required.
#
PREREQ=""
IUCODE_CONFIG=/etc/default/intel-microcode
prereqs()
{
echo "$PREREQ"
}
case $1 in
prereqs)
prereqs
exit 0
;;
esac
. /usr/share/initramfs-tools/hook-functions
verbose()
{
if [ "${verbose}" = "y" ] ; then
echo "intel-microcode: $*"
fi
:
}
if [ "${verbose}" = "y" ] ; then
IUCODE_TOOL_OPTIONS="-l"
else
IUCODE_TOOL_OPTIONS="-q"
fi
IUCODE_TOOL=$(command -v iucode_tool)
if [ -z "${IUCODE_TOOL}" ] && [ -x /usr/sbin/iucode_tool ] ; then
IUCODE_TOOL=/usr/sbin/iucode_tool
fi
IUCODE_FW_DIR=/lib/firmware/intel-ucode
if [ "$MODULES" = "most" ]; then
IUCODE_TOOL_INITRAMFS=early
IUCODE_TOOL_SCANCPUS=no
else
IUCODE_TOOL_INITRAMFS=auto
IUCODE_TOOL_SCANCPUS=yes
fi
IUCODE_TOOL_EXTRA_OPTIONS=
[ -r ${IUCODE_CONFIG} ] && . ${IUCODE_CONFIG}
[ -z "${IUCODE_TOOL_INITRAMFS}" ] && IUCODE_TOOL_INITRAMFS=no
case "${IUCODE_TOOL_INITRAMFS}" in
no|0)
verbose "intel-microcode: disabled by ${IUCODE_CONFIG}"
exit 0
;;
auto|early)
;;
yes|1)
IUCODE_TOOL_INITRAMFS=early
echo "W: intel-microcode: initramfs mode not supported, using early initramfs mode" >&2
;;
*)
echo "E: intel-microcode: invalid IUCODE_TOOL_INITRAMFS, using automatic mode" >&2
IUCODE_TOOL_INITRAMFS=auto
esac
# don't do anything unless there's an Intel processor in the system in auto mode
if [ "${IUCODE_TOOL_INITRAMFS}" = "auto" ] ; then
grep -q "^vendor_id[[:blank:]]*:[[:blank:]]*.*GenuineIntel" /proc/cpuinfo || {
verbose "no Intel processors detected, nothing to do"
exit 0
}
fi
# we require iucode_tool, but something is broken
if [ ! -x "${IUCODE_TOOL}" ] ; then
echo "E: intel-microcode: cannot run iucode_tool!" >&2
exit 0
fi
# Blacklist all kernel versions before v3.10, as they don't support early
# initramfs mode.
#
# This doesn't blacklist early 3.10 kernels in the LTS branches, we don't have
# enough information at the initramfs-tools layer, due to the way Debian and
# Ubuntu version kernel packages.
if dpkg --compare-versions "${version}" lt 3.10 ; then
echo "E: intel-microcode: unsupported kernel version!" >&2
exit 0
fi
if [ "${IUCODE_TOOL_SCANCPUS}" != "yes" ] ; then
verbose "adding microcode for either all or selected Intel processor models"
else
verbose "adding microcode for currently online and selected Intel processors"
grep -q cpu/cpuid /proc/devices || modprobe -q cpuid
IUCODE_TOOL_OPTIONS="${IUCODE_TOOL_OPTIONS} --scan-system"
fi
# paranoia
[ -z "${DESTDIR}" ] && {
echo "E: intel-microcode: DESTDIR empty!" >&2
exit 1
}
[ -z "${IUCODE_FW_DIR}" ] && {
echo "E: intel-microcode: IUCODE_FW_DIR empty!" >&2
exit 1
}
# include the microcode module in the initramfs for logging purposes, but
# ensure it will have no microcode data files to load. This is also a safety
# net: we don't want it to be acidentally loaded outside the initramfs.
#
# This shouldn't be expensive, as the in-kernel firmware loader is quite
# fast at detecting missing data files and doesn't wait for them.
#
# note: force_load will load a blacklisted module. We depend on that behavior.
#
# For 4.4 and later kernels, the microcode driver cannot be a module and will
# be built-in.
dpkg --compare-versions "${version}" lt 4.4 && {
[ -d "${DESTDIR}${IUCODE_FW_DIR}" ] && rm -fr "${DESTDIR}${IUCODE_FW_DIR}"
manual_add_modules microcode && {
# force_load has broken semanthics when the .ko file is missing
find "${DESTDIR}/${MODULESDIR}" -type f -print | grep -qc '/microcode\.ko$' && {
verbose "modular microcode driver detected"
force_load microcode
}
}
}
# generate early initramfs image and prepend
verbose "using early initramfs microcode update mode..."
EFW=$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-EFW_XXXXXXXXXX") || {
echo "E: intel-microcode: cannot create temporary file" >&2
exit 1
}
( find /usr/share/misc -maxdepth 1 -type f -name 'intel-microcode*' -print0 ;
find "${IUCODE_FW_DIR}" -maxdepth 0 -type d -print0 ) 2>/dev/null \
| xargs -0 -r -x ${IUCODE_TOOL} ${IUCODE_TOOL_OPTIONS} \
--write-earlyfw="${EFW}" --overwrite \
${IUCODE_TOOL_EXTRA_OPTIONS} \
&& prepend_earlyinitramfs "${EFW}" && {
rm "${EFW}"
exit 0
}
# usually we get here when initramfs-tools is missing prepend_earlyinitramfs()
# or when iucode_tool does not support --write-earlyfw, i.e. when old versions
# of these tools are installed.
rm "${EFW}" || true
echo "E: intel-microcode: failed to create or prepend the early initramfs to the initramfs" >&2
:
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