build/serial: rebuild UEFI on FreeBSD 13

The .efifat files have been deleted from the distribution so they
need to be handrolled.  That's alright, but then mkimg doesn't work
on FreeBSD 13 because our STAGEDIR contains a ":" character.
Sidestep the issue by using a relative path inside STAGEDIR, but
also hoping that file names with ":" are not becoming second-class.

This should be compatible with 21.7 builds although we likely do not
need new images.

While here also convert dvd image with others to be done later.

build/common.sh

@@ -1111,6 +1111,26 @@ EOF
 EOF
 }
 
+setup_efiboot()
+{
+	local EFIFILE
+
+	if [ ${PRODUCT_ARCH} = "amd64" ]; then
+		EFIFILE=bootx64
+	elif [ ${PRODUCT_ARCH} = "aarch64" ]; then
+		EFIFILE=bootaa64
+	else
+		echo ">>> Unsupported UEFI architecture: ${PRODUCT_ARCH}" >&2
+		exit 1
+	fi
+
+	mkdir -p ${1}.d/EFI/LOADER
+	cp ${2} ${1}.d/EFI/LOADER/${EFIFILE}.efi
+
+	makefs -t msdos -o fat_type=32 -o sectors_per_cluster=1 \
+	    -o volume_label=EFISYS -s 33292k ${1} ${1}.d
+}
+
 setup_stage()
 {
 	echo ">>> Setting up stage in ${1}"

build/dvd.sh

@@ -47,23 +47,14 @@ setup_mtree ${STAGEDIR}/work
 setup_entropy ${STAGEDIR}/work
 
 UEFIBOOT=
-if [ ${PRODUCT_ARCH} = "amd64" -a -n "${PRODUCT_UEFI}" -a \
-    -z "${PRODUCT_UEFI%%*"${SELF}"*}" ]; then
-	dd if=/dev/zero of=${STAGEDIR}/efiboot.img bs=4k count=200
-	DEV=$(mdconfig -a -t vnode -f ${STAGEDIR}/efiboot.img)
-	newfs_msdos -F 12 -m 0xf8 /dev/${DEV}
-	mount -t msdosfs /dev/${DEV} ${STAGEDIR}/mnt
-	mkdir -p ${STAGEDIR}/mnt/efi/boot
-	cp ${STAGEDIR}/work/boot/loader.efi \
-	    ${STAGEDIR}/mnt/efi/boot/bootx64.efi
-	umount ${STAGEDIR}/mnt
-	mdconfig -d -u ${DEV}
 
+if [ -n "${PRODUCT_UEFI}" -a -z "${PRODUCT_UEFI%%*"${SELF}"*}" ]; then
 	UEFIBOOT="-o bootimage=i386;${STAGEDIR}/efiboot.img"
 	UEFIBOOT="${UEFIBOOT} -o no-emul-boot -o platformid=efi"
-fi
 
-echo -n ">>> Building dvd image... "
+	setup_efiboot ${STAGEDIR}/efiboot.img \
+	    ${STAGEDIR}/work/boot/loader.efi
+fi
 
 cat > ${STAGEDIR}/work/etc/fstab << EOF
 # Device	Mountpoint	FStype	Options	Dump	Pass #
@@ -71,6 +62,8 @@ cat > ${STAGEDIR}/work/etc/fstab << EOF
 tmpfs		/tmp		tmpfs	rw,mode=01777	0	0
 EOF
 
+echo -n ">>> Building dvd image... "
+
 makefs -t cd9660 \
     -o 'bootimage=i386;'"${STAGEDIR}"'/work/boot/cdboot' -o no-emul-boot \
     ${UEFIBOOT} -o label=${DVDLABEL} -o rockridge ${DVDIMAGE} ${STAGEDIR}/work

build/serial.sh

@@ -56,15 +56,20 @@ EOF
 makefs -B little -o label=${SERIALLABEL} -o version=2 \
     ${STAGEDIR}/root.part ${STAGEDIR}/work
 
-UEFIBOOT=
 GPTDUMMY=
+UEFIBOOT=
 
-if [ ${PRODUCT_ARCH} = "amd64" -a -n "${PRODUCT_UEFI}" -a \
-    -z "${PRODUCT_UEFI%%*"${SELF}"*}" ]; then
-	UEFIBOOT="-p efi:=${STAGEDIR}/work/boot/boot1.efifat"
+if [ "${PRODUCT_UEFI}" -a -z "${PRODUCT_UEFI%%*"${SELF}"*}" ]; then
 	GPTDUMMY="-p freebsd-swap::512k"
+	UEFIBOOT="-p efi:=efiboot.img"
+
+	setup_efiboot ${STAGEDIR}/efiboot.img \
+	    ${STAGEDIR}/work/boot/loader.efi
 fi
 
-mkimg -s gpt -o ${SERIALIMG} -b ${STAGEDIR}/work/boot/pmbr ${UEFIBOOT} \
-    -p freebsd-boot:=${STAGEDIR}/work/boot/gptboot ${GPTDUMMY} \
-    -p freebsd-ufs:=${STAGEDIR}/root.part
+echo -n ">>> Building serial image... "
+
+(cd ${STAGEDIR}; mkimg -s gpt -o ${SERIALIMG} -b work/boot/pmbr ${UEFIBOOT} \
+    -p freebsd-boot:=work/boot/gptboot ${GPTDUMMY} -p freebsd-ufs:=root.part)
+
+echo "done"