80 lines
2.0 KiB
Bash
Executable File
80 lines
2.0 KiB
Bash
Executable File
#!/bin/sh
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# This script generates the dummy FAT filesystem used for the EFI boot
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# blocks. It uses newfs_msdos to generate a template filesystem with the
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# relevant interesting files. These are then found by grep, and the offsets
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# written to a Makefile snippet.
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#
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# Because it requires root, and because it is overkill, we do not
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# do this as part of the normal build. If makefs(8) grows workable FAT
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# support, this should be revisited.
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# $FreeBSD$
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FAT_SIZE=1600 #Size in 512-byte blocks of the produced image
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BOOT1_OFFSET=2d
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BOOT1_SIZE=384k
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if [ $(id -u) != 0 ]; then
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echo "${0##*/}: must run as root" >&2
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exit 1
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fi
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# Record maximum boot1 size in bytes
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case $BOOT1_SIZE in
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*k)
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BOOT1_MAXSIZE=$(expr ${BOOT1_SIZE%k} '*' 1024)
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;;
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*)
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BOOT1_MAXSIZE=$BOOT1_SIZE
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;;
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esac
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echo '# This file autogenerated by generate-fat.sh - DO NOT EDIT' > Makefile.fat
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echo "# \$FreeBSD\$" >> Makefile.fat
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echo "BOOT1_OFFSET=0x$BOOT1_OFFSET" >> Makefile.fat
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echo "BOOT1_MAXSIZE=$BOOT1_MAXSIZE" >> Makefile.fat
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while read ARCH FILENAME; do
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# Generate 800K FAT image
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OUTPUT_FILE=fat-${ARCH}.tmpl
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dd if=/dev/zero of=$OUTPUT_FILE bs=512 count=$FAT_SIZE
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DEVICE=`mdconfig -a -f $OUTPUT_FILE`
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newfs_msdos -F 12 -L EFI $DEVICE
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mkdir stub
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mount -t msdosfs /dev/$DEVICE stub
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# Create and bless a directory for the boot loader
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mkdir -p stub/efi/boot
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# Make a dummy file for boot1
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echo 'Boot1 START' | dd of=stub/efi/boot/$FILENAME cbs=$BOOT1_SIZE count=1 conv=block
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# Provide a fallback startup.nsh
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echo $FILENAME > stub/efi/boot/startup.nsh
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umount stub
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mdconfig -d -u $DEVICE
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rmdir stub
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# Locate the offset of the fake file
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OFFSET=$(hd $OUTPUT_FILE | grep 'Boot1 START' | cut -f 1 -d ' ')
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# Convert to number of blocks
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OFFSET=$(echo 0x$OFFSET | awk '{printf("%x\n",$1/512);}')
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# Validate the offset
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if [ $OFFSET != $BOOT1_OFFSET ]; then
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echo "Incorrect offset $OFFSET != $BOOT1_OFFSET" >&2
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exit 1
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fi
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xz -f $OUTPUT_FILE
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done <<EOF
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amd64 BOOTx64.efi
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arm64 BOOTaa64.efi
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arm BOOTarm.efi
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i386 BOOTia32.efi
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EOF
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