Current File : //usr/src/linux-headers-5.15.0-125-generic/arch/x86/boot/genimage.sh
#!/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 a 4K block size
filesizes() {
local t=0
local s
for s in $(ls -lnL "$@" 2>/dev/null | awk '/^-/{ print $5; }'); do
t=$((t + ((s+4095)/4096)*4096))
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% + 1 MiB for filesystem and partition table overhead,
# syslinux, and config files
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 -t $megs $ptype -b 512 -a h:
$dd if="$mbr" of="$FIMAGE" bs=440 count=1 conv=notrunc 2>/dev/null
mformat -v 'LINUX_BOOT' -s 32 -h 64 -t $megs h:
syslinux --offset $((512*512)) "$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
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