sys-kernel/linux-firmware: add USE=initramfs

USE=initramfs will create /boot/amd-uc.img.

Package-Manager: Portage-2.3.69, Repoman-2.3.16
Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

2 files changed, 40 insertions, 7 deletions

diff --git a/sys-kernel/linux-firmware/linux-firmware-99999999.ebuild b/sys-kernel/linux-firmware/linux-firmware-99999999.ebuild
index f439b40eab43..c2afff9ee0c0 100644
--- a/sys-kernel/linux-firmware/linux-firmware-99999999.ebuild
+++ b/sys-kernel/linux-firmware/linux-firmware-99999999.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
-inherit savedconfig
+inherit mount-boot savedconfig
 
 if [[ ${PV} == 99999999* ]]; then
 	inherit git-r3
@@ -21,10 +21,12 @@ LICENSE="GPL-2 GPL-2+ GPL-3 BSD MIT || ( MPL-1.1 GPL-2 )
 		linux-fw-redistributable ( BSD-2 BSD BSD-4 ISC MIT no-source-code ) )
 	unknown-license? ( all-rights-reserved )"
 SLOT="0"
-IUSE="+redistributable savedconfig unknown-license"
+IUSE="initramfs +redistributable savedconfig unknown-license"
 RESTRICT="binchecks strip
 	unknown-license? ( bindist )"
 
+BDEPEND="initramfs? ( app-arch/cpio )"
+
 RDEPEND="!savedconfig? (
 		redistributable? (
 			!sys-firmware/alsa-firmware[alsa_cards_ca0132]
@@ -244,8 +246,35 @@ src_prepare() {
 		IFS=$' \t\n'
 	fi
 
+	if use initramfs; then
+		if [[ -d "${S}/amd-ucode" ]]; then
+			local UCODETMP="${T}/ucode_tmp"
+			local UCODEDIR="${UCODETMP}/kernel/x86/microcode"
+			mkdir -p "${UCODEDIR}" || die
+			echo 1 > "${UCODETMP}/early_cpio"
+
+			local amd_ucode_file="${UCODEDIR}/AuthenticAMD.bin"
+			cat "${S}"/amd-ucode/*.bin > "${amd_ucode_file}" || die "Failed to concat amd cpu ucode"
+
+			if [[ ! -s "${amd_ucode_file}" ]]; then
+				die "Sanity check failed: '${amd_ucode_file}' is empty!"
+			fi
+
+			pushd "${UCODETMP}" &>/dev/null || die
+			find . -print0 | cpio --quiet --null -o -H newc -R 0:0 > "${S}"/amd-uc.img
+			popd &>/dev/null || die
+			if [[ ! -s "${S}/amd-uc.img" ]]; then
+				die "Failed to create '${S}/amd-uc.img'!"
+			fi
+		else
+			# If this will ever happen something has changed which
+			# must be reviewed
+			die "'${S}/amd-ucode' not found!"
+		fi
+	fi
+
 	echo "# Remove files that shall not be installed from this list." > ${PN}.conf
-	find * ! -type d ! -name ${PN}.conf >> ${PN}.conf
+	find * ! -type d \( ! -name ${PN}.conf -o -name amd-uc.img \) >> ${PN}.conf
 
 	if use savedconfig; then
 		restore_config ${PN}.conf
@@ -268,6 +297,11 @@ src_install() {
 	fi
 	rm ${PN}.conf || die
 
+	if use initramfs ; then
+		mkdir "${ED}/boot" || die
+		mv "${S}"/amd-uc.img "${ED}/boot" || die
+	fi
+
 	if ! ( shopt -s failglob; : * ) 2>/dev/null; then
 		eerror "No files to install. Check your USE flag settings"
 		eerror "and the list of files in your saved configuration."
diff --git a/sys-kernel/linux-firmware/metadata.xml b/sys-kernel/linux-firmware/metadata.xml
index 7370ea010ccd..b1cdaa4debb2 100644
--- a/sys-kernel/linux-firmware/metadata.xml
+++ b/sys-kernel/linux-firmware/metadata.xml
@@ -14,10 +14,9 @@
 	<name>Gentoo Kernel Project</name>
 </maintainer>
 <use>
-	<flag name="redistributable">Install also non-free (but redistributable)
-	firmware files</flag>
+	<flag name="initramfs">Create and install initramfs for early microcode loading in /boot (only AMD for now)</flag>
+	<flag name="redistributable">Install also non-free (but redistributable) firmware files</flag>
 	<flag name="savedconfig">Allows individual selection of firmware files</flag>
-	<flag name="unknown-license">Install firmware files whose license is
-	unknown</flag>
+	<flag name="unknown-license">Install firmware files whose license is unknown</flag>
 </use>
 </pkgmetadata>