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This creates a AMD microcode image when installing the kernel and when installkernel/kernel-install is configured to use an initramfs generator other then dracut. Dracut bundles the microcode in the image it generates, many other initramfs generators do not and we want these users to also get the latest CPU microcode. installkernel-gentoo.git has recently gained support for handling these ucode images and passing them on to bootloaders and UKI generators. Note that this should be here and not in installkernel-gentoo.git because we only want to install this when the initramfs flag is enabled to avoid the situation where users who don't want an ucode.img get one anyway. To avoid code-duplication we add and install a little helper script that we can call both from the ebuild and from the hooks. Co-authored-by: Zen <z@pyl.onl> Signed-off-by: Andrew Ammerlaan <andrewammerlaan@gentoo.org> Closes: https://github.com/gentoo/gentoo/pull/37320 Signed-off-by: Andrew Ammerlaan <andrewammerlaan@gentoo.org>
80 lines
2.8 KiB
Bash
80 lines
2.8 KiB
Bash
#!/usr/bin/env bash
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# Copyright 2024 Gentoo Authors
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our_name=${0}
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out=${1}
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in=${2}
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# familiar helpers, we intentionally don't use Gentoo functions.sh
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die() {
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echo -e " ${NOCOLOR-\e[1;31m*\e[0m }${*}" >&2
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exit 1
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}
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einfo() {
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echo -e " ${NOCOLOR-\e[1;32m*\e[0m }${*}" >&2
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}
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main() {
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# re-define for subst to work
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[[ -n ${NOCOLOR+yes} ]] && NOCOLOR=
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# Set the output file to arg 1 if it's not a directory.
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# If it's a directory, set the out file to the directory with the default name.
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# If it's a relative filename, include it in the variable.
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local ucode_file=${out:-"/boot/amd-uc.img"}
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if [[ -d ${ucode_file} ]]; then
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ucode_file="${ucode_file}/amd-uc.img"
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einfo "Output file is a directory. Using default name: ${ucode_file}"
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elif [[ ${ucode_file} != /* ]]; then
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ucode_file="$(pwd)/${ucode_file}"
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einfo "Output file is a relative path. Using full path: ${ucode_file}"
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elif [[ -z ${ucode_file} ]]; then
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einfo "Usage: ${our_name} <output image> <microcode directory>"
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die "No output file specified"
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fi
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# Only AMD microcode is in the linux-firmmware package
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local ucode_dir=${in:-"/lib/firmware/amd-ucode"}
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if [[ ! -d ${ucode_dir} ]]; then
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einfo "Usage: ${our_name} <output image> <microcode directory>"
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die "AMD microcode directory does not exist: ${ucode_dir}"
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fi
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# Make the tmp dir for the microcode archive
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local ucode_tmp_dir="$(mktemp -d)" || die "Failed to create temporary directory"
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einfo "Created temporary directory: ${ucode_tmp_dir}"
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local ucode_bin_dir="${ucode_tmp_dir}/kernel/x86/microcode"
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local ucode_bin_file="${ucode_bin_dir}/AuthenticAMD.bin"
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# Write "1" to the early_cpio flag file
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echo 1 > "${ucode_tmp_dir}/early_cpio" || die
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# Make the directory for the microcode bin files
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mkdir -p "${ucode_bin_dir}" || die "Failed to create microcode bin directory: ${ucode_bin_dir}"
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# Concatenate all microcode bin files into a single file
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cat "${ucode_dir}"/*.bin > "${ucode_bin_file}" || die "Failed to concatenate microcode files into: ${ucode_bin_file}"
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# Check that the concatenated file is not empty
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[[ -s "${ucode_bin_file}" ]] || die "Empty microcode file: ${ucode_bin_file}"
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pushd "${ucode_tmp_dir}" &> /dev/null || die
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# Create the cpio archive
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find . -print0 | cpio --quiet --null -o -H newc -R 0:0 > "${ucode_file}" || die "Failed to create microcode archive in: ${ucode_file}"
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popd &> /dev/null || die
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# Check that the cpio archive is not empty
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[[ -s "${ucode_file}" ]] || die "Empty microcode archive at: ${ucode_file}"
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einfo "Created microcode archive at: ${ucode_file}"
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# Clean up the tmp dir
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rm -r "${ucode_tmp_dir}" || die "Failed to remove temporary directory: ${ucode_tmp_dir}"
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einfo "Cleaned up temporary directory: ${ucode_tmp_dir}"
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}
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main
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