1#!/bin/sh 2 3# This script generates the dummy FAT filesystem used for the EFI boot 4# blocks. It uses newfs_msdos to generate a template filesystem with the 5# relevant interesting files. These are then found by grep, and the offsets 6# written to a Makefile snippet. 7# 8# Because it requires root, and because it is overkill, we do not 9# do this as part of the normal build. If makefs(8) grows workable FAT 10# support, this should be revisited. 11 12# $FreeBSD: stable/11/stand/efi/boot1/generate-fat.sh 332746 2018-04-19 01:10:53Z kevans $ 13 14FAT_SIZE=1600 #Size in 512-byte blocks of the produced image 15 16BOOT1_OFFSET=2d 17BOOT1_SIZE=384k 18 19if [ $(id -u) != 0 ]; then 20 echo "${0##*/}: must run as root" >&2 21 exit 1 22fi 23 24# Record maximum boot1 size in bytes 25case $BOOT1_SIZE in 26*k) 27 BOOT1_MAXSIZE=$(expr ${BOOT1_SIZE%k} '*' 1024) 28 ;; 29*) 30 BOOT1_MAXSIZE=$BOOT1_SIZE 31 ;; 32esac 33 34echo '# This file autogenerated by generate-fat.sh - DO NOT EDIT' > Makefile.fat 35echo "# \$FreeBSD\$" >> Makefile.fat 36echo "BOOT1_OFFSET=0x$BOOT1_OFFSET" >> Makefile.fat 37echo "BOOT1_MAXSIZE=$BOOT1_MAXSIZE" >> Makefile.fat 38 39while read ARCH FILENAME; do 40 # Generate 800K FAT image 41 OUTPUT_FILE=fat-${ARCH}.tmpl 42 43 dd if=/dev/zero of=$OUTPUT_FILE bs=512 count=$FAT_SIZE 44 DEVICE=`mdconfig -a -f $OUTPUT_FILE` 45 newfs_msdos -F 12 -L EFISYS $DEVICE 46 mkdir stub 47 mount -t msdosfs /dev/$DEVICE stub 48 49 # Create and bless a directory for the boot loader 50 mkdir -p stub/efi/boot 51 52 # Make a dummy file for boot1 53 echo 'Boot1 START' | dd of=stub/efi/boot/$FILENAME cbs=$BOOT1_SIZE count=1 conv=block 54 # Provide a fallback startup.nsh 55 echo $FILENAME > stub/efi/boot/startup.nsh 56 57 umount stub 58 mdconfig -d -u $DEVICE 59 rmdir stub 60 61 # Locate the offset of the fake file 62 OFFSET=$(hd $OUTPUT_FILE | grep 'Boot1 START' | cut -f 1 -d ' ') 63 64 # Convert to number of blocks 65 OFFSET=$(echo 0x$OFFSET | awk '{printf("%x\n",$1/512);}') 66 67 # Validate the offset 68 if [ $OFFSET != $BOOT1_OFFSET ]; then 69 echo "Incorrect offset $OFFSET != $BOOT1_OFFSET" >&2 70 exit 1 71 fi 72 73 xz -f $OUTPUT_FILE 74done <<EOF 75 amd64 BOOTx64.efi 76 arm64 BOOTaa64.efi 77 arm BOOTarm.efi 78 i386 BOOTia32.efi 79EOF 80