1 files changed, 66 insertions, 0 deletions
diff --git a/sys/boot/efi/boot1/generate-fat.sh b/sys/boot/efi/boot1/generate-fat.sh
new file mode 100755
index 0000000..2688da3
--- /dev/null
+++ b/sys/boot/efi/boot1/generate-fat.sh
@@ -0,0 +1,66 @@
+#!/bin/sh
+
+# This script generates the dummy FAT filesystem used for the EFI boot
+# blocks. It uses newfs_msdos to generate a template filesystem with the
+# relevant interesting files. These are then found by grep, and the offsets
+# written to a Makefile snippet.
+#
+# Because it requires root, and because it is overkill, we do not
+# do this as part of the normal build. If makefs(8) grows workable FAT
+# support, this should be revisited.
+
+# $FreeBSD$
+
+FAT_SIZE=1600 			#Size in 512-byte blocks of the produced image
+
+BOOT1_SIZE=128k
+
+#
+# Known filenames
+# amd64: BOOTx64.efi
+# arm64: BOOTaa64.efi
+#
+if [ -z "$1" ]; then
+	echo "Usage: $0 filename"
+	exit 1
+fi
+
+FILENAME=$1
+
+# Generate 800K FAT image
+OUTPUT_FILE=fat.tmpl
+
+dd if=/dev/zero of=$OUTPUT_FILE bs=512 count=$FAT_SIZE
+DEVICE=`mdconfig -a -f $OUTPUT_FILE`
+newfs_msdos -F 12 -L EFI $DEVICE
+mkdir stub
+mount -t msdosfs /dev/$DEVICE stub
+
+# Create and bless a directory for the boot loader
+mkdir -p stub/efi/boot
+
+# Make a dummy file for boot1
+echo 'Boot1 START' | dd of=stub/efi/boot/$FILENAME cbs=$BOOT1_SIZE count=1 conv=block
+
+umount stub
+mdconfig -d -u $DEVICE
+rmdir stub
+
+# Locate the offset of the fake file
+BOOT1_OFFSET=$(hd $OUTPUT_FILE | grep 'Boot1 START' | cut -f 1 -d ' ')
+
+# Convert to number of blocks
+BOOT1_OFFSET=$(echo 0x$BOOT1_OFFSET | awk '{printf("%x\n",$1/512);}')
+
+echo '# This file autogenerated by generate-fat.sh - DO NOT EDIT' > Makefile.fat
+echo '# $FreeBSD$' >> Makefile.fat
+echo "BOOT1_OFFSET=0x$BOOT1_OFFSET" >> Makefile.fat
+
+bzip2 $OUTPUT_FILE
+echo 'FAT template boot filesystem created by generate-fat.sh' > $OUTPUT_FILE.bz2.uu
+echo 'DO NOT EDIT' >> $OUTPUT_FILE.bz2.uu
+echo '$FreeBSD$' >> $OUTPUT_FILE.bz2.uu
+
+uuencode $OUTPUT_FILE.bz2 $OUTPUT_FILE.bz2 >> $OUTPUT_FILE.bz2.uu
+rm $OUTPUT_FILE.bz2
+