new slx-drm and slx-splash (PoC) modules

slx-drm pulls in dracut's drm module and provides a modprobe.d
configurations file to always prioritize nvidia drivers, falling back to
nouveau on failures.

slx-splash uses the slx busybox's fbsplash (WIP). Busybox is still
missing from defaults builds, so this won't function out of the box!

1 files changed, 42 insertions, 0 deletions

diff --git a/builder/modules.d/slx-splash/scripts/slx-splash.sh b/builder/modules.d/slx-splash/scripts/slx-splash.sh
new file mode 100644
index 00000000..8f3ccec3
--- /dev/null
+++ b/builder/modules.d/slx-splash/scripts/slx-splash.sh
@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+show_splash() {
+	if [ -e "/etc/splash.ppm.gz" ]; then
+		/usr/bin/systemd-preserve-process-marker /bin/busybox fbsplash -x -b -s "/etc/splash.ppm.gz" &
+	elif [ -e "/etc/splash.ppm" ]; then
+		/usr/bin/systemd-preserve-process-marker /bin/busybox fbsplash -x -b -s "/etc/splash.ppm" &
+	else
+		echo "Splash screen requested, but not found in initramfs..."
+	fi
+}
+
+init_drm() {
+	# taken from dracut's plymouth module
+	# first trigger graphics subsystem
+	udevadm trigger --action=add --attr-match=class=0x030000 >/dev/null 2>&1
+	# first trigger graphics and tty subsystem
+	udevadm trigger --action=add \
+  	--subsystem-match=graphics \
+		--subsystem-match=drm \
+		--subsystem-match=tty \
+		--subsystem-match=acpi \
+		>/dev/null 2>&1
+
+	udevadm settle --timeout=180 2>&1
+}
+
+if grep -qE '\s+splash\s+' /proc/cmdline; then
+	# first init graphics
+	init_drm
+	# disable non-critical kernel messages
+	echo "1 1 0 1" > /proc/sys/kernel/printk
+	# disable systemd's status message on console
+	# See: https://www.freedesktop.org/software/systemd/man/systemd.html#Signals
+	kill -55 1
+	# clear console
+	busybox clear
+	# disable cursor
+	echo -e "\033[?25l" > /dev/console
+	# finally:
+	show_splash
+fi