linux-stable/arch/x86/boot/genimage.sh
H. Peter Anvin (Intel) 067595d728 x86/boot: Fix make hdimage with older versions of mtools
Some versions of mtools (fixed somewhere between 4.0.31 and 4.0.35)
generate bad output for mformat when used with the partition= option.
Use the offset= option instead. An mtools.conf entry is *also* needed
with partition= to support mpartition; combining them in one entry does
not work either.

Don't specify the -t option to mpartition; it is unnecessary and seems
to confuse mpartition under some circumstances.

Also do a few minor optimizations:

Use a larger cluster size; there is no reason for the typical 4K
clusters when we are dealing mainly with comparatively huge files.

Start the partition at 32K. There is no reason to align it more than
that, since the internal FAT filesystem structures will at best be
cluster-aligned, and 32K is the maximum FAT cluster size.

 [ bp: Remove "we". ]

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210911003906.2700218-1-hpa@zytor.com
2021-09-29 11:06:47 +02:00

272 lines
6.5 KiB
Bash

#!/bin/bash
#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 2017 by Changbin Du <changbin.du@intel.com>
#
# Adapted from code in arch/x86/boot/Makefile by H. Peter Anvin and others
#
# "make fdimage/fdimage144/fdimage288/hdimage/isoimage"
# script for x86 architecture
#
# Arguments:
# $1 - fdimage format
# $2 - target image file
# $3 - kernel bzImage file
# $4 - mtools configuration file
# $5 - kernel cmdline
# $6+ - initrd image file(s)
#
# This script requires:
# bash
# syslinux
# mtools (for fdimage* and hdimage)
# edk2/OVMF (for hdimage)
#
# Otherwise try to stick to POSIX shell commands...
#
# Use "make V=1" to debug this script
case "${KBUILD_VERBOSE}" in
*1*)
set -x
;;
esac
# Exit the top-level shell with an error
topshell=$$
trap 'exit 1' USR1
die() {
echo "" 1>&2
echo " *** $*" 1>&2
echo "" 1>&2
kill -USR1 $topshell
}
# Verify the existence and readability of a file
verify() {
if [ ! -f "$1" -o ! -r "$1" ]; then
die "Missing file: $1"
fi
}
diskfmt="$1"
FIMAGE="$2"
FBZIMAGE="$3"
MTOOLSRC="$4"
KCMDLINE="$5"
shift 5 # Remaining arguments = initrd files
export MTOOLSRC
# common options for dd
dd='dd iflag=fullblock'
# Make sure the files actually exist
verify "$FBZIMAGE"
declare -a FDINITRDS
irdpfx=' initrd='
initrdopts_syslinux=''
initrdopts_efi=''
for f in "$@"; do
if [ -f "$f" -a -r "$f" ]; then
FDINITRDS=("${FDINITRDS[@]}" "$f")
fname="$(basename "$f")"
initrdopts_syslinux="${initrdopts_syslinux}${irdpfx}${fname}"
irdpfx=,
initrdopts_efi="${initrdopts_efi} initrd=${fname}"
fi
done
# Read a $3-byte littleendian unsigned value at offset $2 from file $1
le() {
local n=0
local m=1
for b in $(od -A n -v -j $2 -N $3 -t u1 "$1"); do
n=$((n + b*m))
m=$((m * 256))
done
echo $n
}
# Get the EFI architecture name such that boot{name}.efi is the default
# boot file name. Returns false with no output if the file is not an
# EFI image or otherwise unknown.
efiarch() {
[ -f "$1" ] || return
[ $(le "$1" 0 2) -eq 23117 ] || return # MZ magic
peoffs=$(le "$1" 60 4) # PE header offset
[ $peoffs -ge 64 ] || return
[ $(le "$1" $peoffs 4) -eq 17744 ] || return # PE magic
case $(le "$1" $((peoffs+4+20)) 2) in # PE type
267) ;; # PE32
523) ;; # PE32+
*) return 1 ;; # Invalid
esac
[ $(le "$1" $((peoffs+4+20+68)) 2) -eq 10 ] || return # EFI app
case $(le "$1" $((peoffs+4)) 2) in # Machine type
332) echo i386 ;;
450) echo arm ;;
512) echo ia64 ;;
20530) echo riscv32 ;;
20580) echo riscv64 ;;
20776) echo riscv128 ;;
34404) echo x64 ;;
43620) echo aa64 ;;
esac
}
# Get the combined sizes in bytes of the files given, counting sparse
# files as full length, and padding each file to cluster size
cluster=16384
filesizes() {
local t=0
local s
for s in $(ls -lnL "$@" 2>/dev/null | awk '/^-/{ print $5; }'); do
t=$((t + ((s+cluster-1)/cluster)*cluster))
done
echo $t
}
# Expand directory names which should be in /usr/share into a list
# of possible alternatives
sharedirs() {
local dir file
for dir in /usr/share /usr/lib64 /usr/lib; do
for file; do
echo "$dir/$file"
echo "$dir/${file^^}"
done
done
}
efidirs() {
local dir file
for dir in /usr/share /boot /usr/lib64 /usr/lib; do
for file; do
echo "$dir/$file"
echo "$dir/${file^^}"
done
done
}
findsyslinux() {
local f="$(find -L $(sharedirs syslinux isolinux) \
-name "$1" -readable -type f -print -quit 2>/dev/null)"
if [ ! -f "$f" ]; then
die "Need a $1 file, please install syslinux/isolinux."
fi
echo "$f"
return 0
}
findovmf() {
local arch="$1"
shift
local -a names=(-false)
local name f
for name; do
names=("${names[@]}" -or -iname "$name")
done
for f in $(find -L $(efidirs edk2 ovmf) \
\( "${names[@]}" \) -readable -type f \
-print 2>/dev/null); do
if [ "$(efiarch "$f")" = "$arch" ]; then
echo "$f"
return 0
fi
done
die "Need a $1 file for $arch, please install EDK2/OVMF."
}
do_mcopy() {
if [ ${#FDINITRDS[@]} -gt 0 ]; then
mcopy "${FDINITRDS[@]}" "$1"
fi
if [ -n "$efishell" ]; then
mmd "$1"EFI "$1"EFI/Boot
mcopy "$efishell" "$1"EFI/Boot/boot${kefiarch}.efi
fi
if [ -n "$kefiarch" ]; then
echo linux "$KCMDLINE$initrdopts_efi" | \
mcopy - "$1"startup.nsh
fi
echo default linux "$KCMDLINE$initrdopts_syslinux" | \
mcopy - "$1"syslinux.cfg
mcopy "$FBZIMAGE" "$1"linux
}
genbzdisk() {
verify "$MTOOLSRC"
mformat -v 'LINUX_BOOT' a:
syslinux "$FIMAGE"
do_mcopy a:
}
genfdimage144() {
verify "$MTOOLSRC"
$dd if=/dev/zero of="$FIMAGE" bs=1024 count=1440 2>/dev/null
mformat -v 'LINUX_BOOT' v:
syslinux "$FIMAGE"
do_mcopy v:
}
genfdimage288() {
verify "$MTOOLSRC"
$dd if=/dev/zero of="$FIMAGE" bs=1024 count=2880 2>/dev/null
mformat -v 'LINUX_BOOT' w:
syslinux "$FIMAGE"
do_mcopy w:
}
genhdimage() {
verify "$MTOOLSRC"
mbr="$(findsyslinux mbr.bin)"
kefiarch="$(efiarch "$FBZIMAGE")"
if [ -n "$kefiarch" ]; then
# The efishell provides command line handling
efishell="$(findovmf $kefiarch shell.efi shell${kefiarch}.efi)"
ptype='-T 0xef' # EFI system partition, no GPT
fi
sizes=$(filesizes "$FBZIMAGE" "${FDINITRDS[@]}" "$efishell")
# Allow 1% + 2 MiB for filesystem and partition table overhead,
# syslinux, and config files; this is probably excessive...
megs=$(((sizes + sizes/100 + 2*1024*1024 - 1)/(1024*1024)))
$dd if=/dev/zero of="$FIMAGE" bs=$((1024*1024)) count=$megs 2>/dev/null
mpartition -I -c -s 32 -h 64 $ptype -b 64 -a p:
$dd if="$mbr" of="$FIMAGE" bs=440 count=1 conv=notrunc 2>/dev/null
mformat -v 'LINUX_BOOT' -s 32 -h 64 -c $((cluster/512)) -t $megs h:
syslinux --offset $((64*512)) "$FIMAGE"
do_mcopy h:
}
geniso() {
tmp_dir="$(dirname "$FIMAGE")/isoimage"
rm -rf "$tmp_dir"
mkdir "$tmp_dir"
isolinux=$(findsyslinux isolinux.bin)
ldlinux=$(findsyslinux ldlinux.c32)
cp "$isolinux" "$ldlinux" "$tmp_dir"
cp "$FBZIMAGE" "$tmp_dir"/linux
echo default linux "$KCMDLINE" > "$tmp_dir"/isolinux.cfg
cp "${FDINITRDS[@]}" "$tmp_dir"/
genisoimage -J -r -appid 'LINUX_BOOT' -input-charset=utf-8 \
-quiet -o "$FIMAGE" -b isolinux.bin \
-c boot.cat -no-emul-boot -boot-load-size 4 \
-boot-info-table "$tmp_dir"
isohybrid "$FIMAGE" 2>/dev/null || true
rm -rf "$tmp_dir"
}
rm -f "$FIMAGE"
case "$diskfmt" in
bzdisk) genbzdisk;;
fdimage144) genfdimage144;;
fdimage288) genfdimage288;;
hdimage) genhdimage;;
isoimage) geniso;;
*) die "Unknown image format: $diskfmt";;
esac