x86/build: Factor out fdimage/isoimage generation commands to standalone script

The build messages for fdimage/isoimage generation are pretty unstructured,
just the raw shell command blocks are printed.

Emit shortened messages similar to existing kbuild messages, and move
the Makefile commands into a separate shell script - which is much
easier to handle.

This patch factors out the commands used for fdimage/isoimage generation
from arch/x86/boot/Makefile to a new script arch/x86/boot/genimage.sh.
Then it adds the new kbuild command 'genimage' which invokes the new script.
All fdimages/isoimage files are now generated by a call to 'genimage' with
different parameters.

Now 'make isoimage' becomes:

	...
	Kernel: arch/x86/boot/bzImage is ready  (#30)
	  GENIMAGE arch/x86/boot/image.iso
	Size of boot image is 4 sectors -> No emulation
	 15.37% done, estimate finish Sun Nov  5 23:36:57 2017
	 30.68% done, estimate finish Sun Nov  5 23:36:57 2017
	 46.04% done, estimate finish Sun Nov  5 23:36:57 2017
	 61.35% done, estimate finish Sun Nov  5 23:36:57 2017
	 76.69% done, estimate finish Sun Nov  5 23:36:57 2017
	 92.00% done, estimate finish Sun Nov  5 23:36:57 2017
	Total translation table size: 2048
	Total rockridge attributes bytes: 659
	Total directory bytes: 0
	Path table size(bytes): 10
	Max brk space used 0
	32608 extents written (63 MB)
	Kernel: arch/x86/boot/image.iso is ready

Before:

	Kernel: arch/x86/boot/bzImage is ready  (#63)
	rm -rf arch/x86/boot/isoimage
	mkdir arch/x86/boot/isoimage
	for i in lib lib64 share end ; do \
		if [ -f /usr/$i/syslinux/isolinux.bin ] ; then \
			cp /usr/$i/syslinux/isolinux.bin arch/x86/boot/isoimage ; \
			if [ -f /usr/$i/syslinux/ldlinux.c32 ]; then \
				cp /usr/$i/syslinux/ldlinux.c32 arch/x86/boot/isoimage ; \
			fi ; \
			break ; \
		fi ; \
		if [ $i = end ] ; then exit 1 ; fi ; \
	done
	...

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Changbin Du <changbin.du@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1509939179-7556-2-git-send-email-changbin.du@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/boot/genimage.sh

@@ -0,0 +1,105 @@
+#!/bin/sh
+#
+# 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/isoimage" script for x86 architecture
+#
+# Arguments:
+#   $1 - fdimage format
+#   $2 - target image file
+#   $3 - kernel bzImage file
+#   $4 - mtool configuration file
+#   $5 - kernel cmdline
+#   $6 - inird image file
+#
+
+verify () {
+	if [ ! -f "$1" ]; then
+		echo ""                                                   1>&2
+		echo " *** Missing file: $1"                              1>&2
+		echo ""                                                   1>&2
+		exit 1
+	fi
+}
+
+
+export MTOOLSRC=$4
+FIMAGE=$2
+FBZIMAGE=$3
+KCMDLINE=$5
+FDINITRD=$6
+
+# Make sure the files actually exist
+verify "$FBZIMAGE"
+verify "$MTOOLSRC"
+
+genbzdisk() {
+	mformat a:
+	syslinux $FIMAGE
+	echo "$KCMDLINE" | mcopy - a:syslinux.cfg
+	if [ -f "$FDINITRD" ] ; then
+		mcopy "$FDINITRD" a:initrd.img
+	fi
+	mcopy $FBZIMAGE a:linux
+}
+
+genfdimage144() {
+	dd if=/dev/zero of=$FIMAGE bs=1024 count=1440
+	mformat v:
+	syslinux $FIMAGE
+	echo "$KCMDLINE" | mcopy - v:syslinux.cfg
+	if [ -f "$FDINITRD" ] ; then
+		mcopy "$FDINITRD" v:initrd.img
+	fi
+	mcopy $FBZIMAGE v:linux
+}
+
+genfdimage288() {
+	dd if=/dev/zero of=$FIMAGE bs=1024 count=2880
+	mformat w:
+	syslinux $FIMAGE
+	echo "$KCMDLINE" | mcopy - W:syslinux.cfg
+	if [ -f "$FDINITRD" ] ; then
+		mcopy "$FDINITRD" w:initrd.img
+	fi
+	mcopy $FBZIMAGE w:linux
+}
+
+genisoimage() {
+	tmp_dir=`dirname $FIMAGE`/isoimage
+	rm -rf $tmp_dir
+	mkdir $tmp_dir
+	for i in lib lib64 share end ; do
+		if [ -f /usr/$i/syslinux/isolinux.bin ] ; then
+			cp /usr/$i/syslinux/isolinux.bin $tmp_dir
+			if [ -f /usr/$i/syslinux/ldlinux.c32 ]; then
+				cp /usr/$i/syslinux/ldlinux.c32 $tmp_dir
+			fi
+			break
+		fi
+		if [ $i = end ] ; then exit 1 ; fi ;
+	done
+	cp $FBZIMAGE $tmp_dir/linux
+	echo "$KCMDLINE" > $tmp_dir/isolinux.cfg
+	if [ -f "$FDINITRD" ] ; then
+		cp "$FDINITRD" $tmp_dir/initrd.img
+	fi
+	mkisofs -J -r -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
+}
+
+case $1 in
+	bzdisk)     genbzdisk;;
+	fdimage144) genfdimage144;;
+	fdimage288) genfdimage288;;
+	isoimage)   genisoimage;;
+	*)          echo 'Unknown image format'; exit 1;
+esac