kbd: Add setfont from kbd to set large console font on large displays

Build kbd and ship setfont if enabled with CONFIG_KBD.

When CONFIG_KBD is enabled, setconsolefont.sh will double the console
font size on large displays (>1600 lines tall as a heuristic).

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>

Makefile

@@ -518,6 +518,7 @@ bin_modules-$(CONFIG_BASH) += bash
 bin_modules-$(CONFIG_POWERPC_UTILS) += powerpc-utils
 bin_modules-$(CONFIG_IO386) += io386
 bin_modules-$(CONFIG_IOPORT) += ioport
+bin_modules-$(CONFIG_KBD) += kbd
 bin_modules-$(CONFIG_ZSTD) += zstd
 
 $(foreach m, $(bin_modules-y), \

initrd/bin/setconsolefont.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -eo pipefail
+. /etc/functions
+
+TRACE "Under /bin/setconsolefont.sh"
+
+# If the board ships setfont, and the console size is >=1600 lines tall,
+# increase the console font size.
+if [ ! -x /bin/setfont ]; then
+	DEBUG "Board does not ship setfont, not checking console font"
+	exit 0
+fi
+
+if [ ! -f /sys/class/graphics/fb0/virtual_size ]; then
+	DEBUG "fb0 virtual size is not known"
+	exit 0
+fi
+
+CONSOLE_HEIGHT="$(cut -d, -f2 /sys/class/graphics/fb0/virtual_size)"
+
+if [ "$CONSOLE_HEIGHT" -ge 1600 ]; then
+	DEBUG "Double console font size due to framebuffer height $CONSOLE_HEIGHT"
+	# Double the default font size by reading it out, then applying it again
+	# with setfont's -d option (double font size)
+	setfont -O /tmp/default_font
+	setfont -d /tmp/default_font
+	rm /tmp/default_font
+else
+	DEBUG "Keep default console font size due to framebuffer height $CONSOLE_HEIGHT"
+fi

initrd/init

@@ -153,6 +153,9 @@ if [ ! -z "$CONFIG_BOOT_DEV" ]; then
 	echo >> /etc/fstab "$CONFIG_BOOT_DEV /boot auto defaults,ro 0 0"
 fi
 
+# Set the console font if needed
+[ -x /bin/bash ] && setconsolefont.sh
+
 if [ "$CONFIG_BASIC" = "y" ]; then
 	CONFIG_BOOTSCRIPT=/bin/gui-init-basic
 	export CONFIG_HOTPKEY=n

modules/kbd

@@ -0,0 +1,24 @@
+modules-$(CONFIG_KBD) += kbd
+
+kbd_version := 2.6.1
+kbd_dir := kbd-$(kbd_version)
+kbd_tar := kbd-$(kbd_version).tar.gz
+kbd_url := https://www.kernel.org/pub/linux/utils/kbd/$(kbd_tar)
+kbd_hash := aaed530a1490d63d041448372e2ad4f38c3179042903251000b71d527c46e945
+
+kbd_configure := CFLAGS=-Os ./configure \
+	$(CROSS_TOOLS) \
+	--prefix "" \
+	--host i386-elf-linux \
+	--disable-optional-progs \
+	--disable-libkeymap \
+	--disable-libkfont \
+	--disable-vlock \
+
+kbd_target := \
+	$(MAKE_JOBS) $(CROSS_TOOLS)
+
+kbd_output := \
+	src/setfont
+
+kbd_depends := $(musl_dep)