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#!/usr/bin/env bash
# Copyright 2024 Gentoo Authors
our_name=${0}
out=${1}
in=${2}
# familiar helpers, we intentionally don't use Gentoo functions.sh
die() {
echo -e " ${NOCOLOR-\e[1;31m*\e[0m }${*}" >&2
exit 1
}
einfo() {
echo -e " ${NOCOLOR-\e[1;32m*\e[0m }${*}" >&2
}
main() {
# re-define for subst to work
[[ -n ${NOCOLOR+yes} ]] && NOCOLOR=
# Set the output file to arg 1 if it's not a directory.
# If it's a directory, set the out file to the directory with the default name.
# If it's a relative filename, include it in the variable.
local ucode_file=${out:-"/boot/amd-uc.img"}
if [[ -d ${ucode_file} ]]; then
ucode_file="${ucode_file}/amd-uc.img"
einfo "Output file is a directory. Using default name: ${ucode_file}"
elif [[ ${ucode_file} != /* ]]; then
ucode_file="$(pwd)/${ucode_file}"
einfo "Output file is a relative path. Using full path: ${ucode_file}"
elif [[ -z ${ucode_file} ]]; then
einfo "Usage: ${our_name} <output image> <microcode directory>"
die "No output file specified"
fi
# Only AMD microcode is in the linux-firmmware package
local ucode_dir=${in:-"/lib/firmware/amd-ucode"}
if [[ ! -d ${ucode_dir} ]]; then
einfo "Usage: ${our_name} <output image> <microcode directory>"
die "AMD microcode directory does not exist: ${ucode_dir}"
fi
# Make the tmp dir for the microcode archive
local ucode_tmp_dir="$(mktemp -d)" || die "Failed to create temporary directory"
einfo "Created temporary directory: ${ucode_tmp_dir}"
local ucode_bin_dir="${ucode_tmp_dir}/kernel/x86/microcode"
local ucode_bin_file="${ucode_bin_dir}/AuthenticAMD.bin"
# Write "1" to the early_cpio flag file
echo 1 > "${ucode_tmp_dir}/early_cpio" || die
# Make the directory for the microcode bin files
mkdir -p "${ucode_bin_dir}" || die "Failed to create microcode bin directory: ${ucode_bin_dir}"
# Concatenate all microcode bin files into a single file
cat "${ucode_dir}"/*.bin > "${ucode_bin_file}" || die "Failed to concatenate microcode files into: ${ucode_bin_file}"
# Check that the concatenated file is not empty
[[ -s "${ucode_bin_file}" ]] || die "Empty microcode file: ${ucode_bin_file}"
pushd "${ucode_tmp_dir}" &> /dev/null || die
# Create the cpio archive
find . -print0 | cpio --quiet --null -o -H newc -R 0:0 > "${ucode_file}" || die "Failed to create microcode archive in: ${ucode_file}"
popd &> /dev/null || die
# Check that the cpio archive is not empty
[[ -s "${ucode_file}" ]] || die "Empty microcode archive at: ${ucode_file}"
einfo "Created microcode archive at: ${ucode_file}"
# Clean up the tmp dir
rm -r "${ucode_tmp_dir}" || die "Failed to remove temporary directory: ${ucode_tmp_dir}"
einfo "Cleaned up temporary directory: ${ucode_tmp_dir}"
}
main
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