diff options
Diffstat (limited to 'sys/boot/amd64/boot1.efi/generate-fat.sh')
-rwxr-xr-x | sys/boot/amd64/boot1.efi/generate-fat.sh | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/sys/boot/amd64/boot1.efi/generate-fat.sh b/sys/boot/amd64/boot1.efi/generate-fat.sh new file mode 100755 index 0000000..eafd3e0 --- /dev/null +++ b/sys/boot/amd64/boot1.efi/generate-fat.sh @@ -0,0 +1,54 @@ +#!/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=64k + +# 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 $DEVICE +mkdir stub +mount -t msdosfs /dev/$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/BOOTx64.efi cbs=$BOOT1_SIZE count=1 conv=block + +umount stub +mdconfig -d -u $DEVICE +rmdir stub + +# Locate the offsets of the two fake files +BOOT1_OFFSET=$(hd $OUTPUT_FILE | grep 'Boot1 START' | cut -f 1 -d ' ') + +# Convert to numbers of blocks +BOOT1_OFFSET=$(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 + |