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Filename : amd64_microcode
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#!/bin/sh
# amd64-microcode initramfs-tools hook script
# Copyright (C) 2012-2016 Henrique de Moraes Holschuh <hmh@debian.org>
# Released under the GPL v2 or later license
#
# Generates a copy of the minimal microcode for all AMD processors
# and installs it to the early initramfs

PREREQ=""
AMD64UCODE_CONFIG=/etc/default/amd64-microcode

prereqs()
{
   echo "$PREREQ"
}

case $1 in
prereqs)
   prereqs
   exit 0
   ;;
esac

. /usr/share/initramfs-tools/hook-functions

verbose()
{
    if [ "${verbose}" = "y" ] ; then
        echo "I: amd64-microcode: $*"
    fi
    :
}

AUCODE_FW_DIR=/lib/firmware/amd-ucode
if [ "$MODULES" = "most" ]; then
    AMD64UCODE_INITRAMFS=${AMD64UCODE_INITRAMFS:-early}
else
    AMD64UCODE_INITRAMFS=${AMD64UCODE_INITRAMFS:-auto}
fi
[ -r ${AMD64UCODE_CONFIG} ] && . ${AMD64UCODE_CONFIG}

[ -z "${AMD64UCODE_INITRAMFS}" ] && AMD64UCODE_INITRAMFS=no

if [ ! -d "${AUCODE_FW_DIR}" ] ; then
    verbose "no AMD64 processor microcode datafiles to install"
    exit 0
fi

case "${AMD64UCODE_INITRAMFS}" in
    no|0)
        verbose "disabled by ${AMD64UCODE_CONFIG}"
        exit 0
        ;;
    auto|early)
        ;;
    yes|1)
        echo "W: amd64-microcode: initramfs mode not supported, using early-initramfs mode" >&2
        AMD64UCODE_INITRAMFS=early
        ;;
    *)
        echo "E: amd64-microcode: invalid AMD64UCODE_INITRAMFS, using automatic mode" >&2
        AMD64UCODE_INITRAMFS=auto
esac

if [ "${AMD64UCODE_INITRAMFS}" = "auto" ] ; then
    grep -q "^vendor_id[[:blank:]]*:[[:blank:]]*.*AuthenticAMD" /proc/cpuinfo || {
        verbose "no AMD processors detected, nothing to do"
        exit 0
    }
fi

# whitelist AMD early updates for kernels 3.14 and later
if dpkg --compare-versions "${version}" lt 3.14 ; then
    echo "E: amd64-microcode: unsupported kernel version!" >&2
    exit 0
fi

verbose "installing AMD64 microcode into the early initramfs..."

# set during package build to the date from the package *version*
CHANGELOG_TS=1576627200

EFWD=$(mktemp -d "${TMPDIR:-/var/tmp}/mkinitramfs-EFW_XXXXXXXXXX") || {
    echo "E: amd64-microcode: cannot create temporary directory" >&2
    exit 1
}
# paranoia
[ ! -d "${EFWD}" ] && {
    echo "E: amd64-microcode: mktemp -d malfunction" >&2
    exit 1
}

EFWE="${EFWD}/early-initramfs.cpio"

EFWCD="${EFWD}/d/kernel/x86/microcode"
EFWF="${EFWCD}/AuthenticAMD.bin"

# note: to build a reproducible early initramfs, we force
# the microcode component ordering inside the microcode
# firmware file, as well as the timestamp and ordering of
# all cpio members.
mkdir -p "${EFWCD}" && \
 find "${AUCODE_FW_DIR}/." -maxdepth 1 -type f -print0 | LC_ALL=C sort -z | xargs -0 -r cat 2>/dev/null >"${EFWF}" && \
 find "${EFWD}" -print0 | xargs -0r touch --no-dereference --date="@${CHANGELOG_TS}" && { \
    # --reproducible requires cpio >= 2.12
    cpio --usage | grep -qs -- "--reproducible" && cpio_reproducible="--reproducible" || true
 } && test -s "${EFWF}" && \
 ( cd "${EFWD}/d" ; find . -print0 | LC_ALL=C sort -z | cpio --null $cpio_reproducible -R 0:0 -H newc -o --quiet > "${EFWE}" ) \
&& prepend_earlyinitramfs "${EFWE}" || {
    # something failed somewhere in that pipeline
    [ -d "${EFWD}" ] && rm -fr "${EFWD}"
    echo "E: amd64-microcode: failed to create or prepend the early initramfs to the initramfs" >&2
    exit 0
}

[ -d "${EFWD}" ] && rm -fr "${EFWD}"

# attempt to load microcode module to get proper logging.
# microcode support cannot be made modular since Linux 4.4

if dpkg --compare-versions "${version}" lt 4.4 ; then
    manual_add_modules microcode && {
        # force_load has broken semanthics when the .ko file is missing
        find "${DESTDIR}/${MODULESDIR}" -type f -print | grep -qc '/microcode\.ko$' && {
          verbose "modular microcode driver detected"
          force_load microcode
        }
    }
fi

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