#!/bin/sh
  
  # Copyright (C) 2006 Paul Mackerras, IBM Corporation <paulus@samba.org>
  # This program may be used under the terms of version 2 of the GNU
  # General Public License.
  
  # This script takes a kernel binary and optionally an initrd image
  # and/or a device-tree blob, and creates a bootable zImage for a
  # given platform.
  
  # Options:
  # -o zImage	specify output file
  # -p platform	specify platform (links in $platform.o)
  # -i initrd	specify initrd file
  # -d devtree	specify device-tree blob
  # -s tree.dts	specify device-tree source file (needs dtc installed)
  # -c		cache $kernel.strip.gz (use if present & newer, else make)
  # -C prefix	specify command prefix for cross-building tools
  #		(strip, objcopy, ld)
  # -D dir	specify directory containing data files used by script
  #		(default ./arch/powerpc/boot)
  # -W dir	specify working directory for temporary files (default .)
  
  # Stop execution if any command fails
  set -e
  
  # Allow for verbose output
  if [ "$V" = 1 ]; then
      set -x
  fi
  
  # defaults
  kernel=
  ofile=zImage
  platform=of
  initrd=
  dtb=
  dts=
  cacheit=
  binary=
  gzip=.gz
  pie=
  
  # cross-compilation prefix
  CROSS=
  
  # mkimage wrapper script
  MKIMAGE=$srctree/scripts/mkuboot.sh
  
  # directory for object and other files used by this script
  object=arch/powerpc/boot
  objbin=$object
  dtc=scripts/dtc/dtc
  
  # directory for working files
  tmpdir=.
  
  usage() {
      echo 'Usage: wrapper [-o output] [-p platform] [-i initrd]' >&2
      echo '       [-d devtree] [-s tree.dts] [-c] [-C cross-prefix]' >&2
      echo '       [-D datadir] [-W workingdir] [--no-gzip] [vmlinux]' >&2
      exit 1
  }
  
  while [ "$#" -gt 0 ]; do
      case "$1" in
      -o)
  	shift
  	[ "$#" -gt 0 ] || usage
  	ofile="$1"
  	;;
      -p)
  	shift
  	[ "$#" -gt 0 ] || usage
  	platform="$1"
  	;;
      -i)
  	shift
  	[ "$#" -gt 0 ] || usage
  	initrd="$1"
  	;;
      -d)
  	shift
  	[ "$#" -gt 0 ] || usage
  	dtb="$1"
  	;;
      -s)
  	shift
  	[ "$#" -gt 0 ] || usage
  	dts="$1"
  	;;
      -c)
  	cacheit=y
  	;;
      -C)
  	shift
  	[ "$#" -gt 0 ] || usage
  	CROSS="$1"
  	;;
      -D)
  	shift
  	[ "$#" -gt 0 ] || usage
  	object="$1"
  	objbin="$1"
  	;;
      -W)
  	shift
  	[ "$#" -gt 0 ] || usage
  	tmpdir="$1"
  	;;
      --no-gzip)
          gzip=
          ;;
      -?)
  	usage
  	;;
      *)
  	[ -z "$kernel" ] || usage
  	kernel="$1"
  	;;
      esac
      shift
  done
  
  if [ -n "$dts" ]; then
      if [ ! -r "$dts" -a -r "$object/dts/$dts" ]; then
  	dts="$object/dts/$dts"
      fi
      if [ -z "$dtb" ]; then
  	dtb="$platform.dtb"
      fi
      $dtc -O dtb -o "$dtb" -b 0 "$dts"
  fi
  
  if [ -z "$kernel" ]; then
      kernel=vmlinux
  fi
  
  platformo=$object/"$platform".o
  lds=$object/zImage.lds
  ext=strip
  objflags=-S
  tmp=$tmpdir/zImage.$$.o
  ksection=.kernel:vmlinux.strip
  isection=.kernel:initrd
  link_address='0x400000'
  make_space=y
  
  case "$platform" in
  of)
      platformo="$object/of.o $object/epapr.o"
      make_space=n
      ;;
  pseries)
      platformo="$object/of.o $object/epapr.o"
      link_address='0x4000000'
      make_space=n
      ;;
  maple)
      platformo="$object/of.o $object/epapr.o"
      link_address='0x400000'
      make_space=n
      ;;
  pmac|chrp)
      platformo="$object/of.o $object/epapr.o"
      make_space=n
      ;;
  coff)
      platformo="$object/crt0.o $object/of.o $object/epapr.o"
      lds=$object/zImage.coff.lds
      link_address='0x500000'
      make_space=n
      pie=
      ;;
  miboot|uboot*)
      # miboot and U-boot want just the bare bits, not an ELF binary
      ext=bin
      objflags="-O binary"
      tmp="$ofile"
      ksection=image
      isection=initrd
      ;;
  cuboot*)
      binary=y
      gzip=
      case "$platform" in
      *-mpc866ads|*-mpc885ads|*-adder875*|*-ep88xc)
          platformo=$object/cuboot-8xx.o
          ;;
      *5200*|*-motionpro)
          platformo=$object/cuboot-52xx.o
          ;;
      *-pq2fads|*-ep8248e|*-mpc8272*|*-storcenter)
          platformo=$object/cuboot-pq2.o
          ;;
      *-mpc824*)
          platformo=$object/cuboot-824x.o
          ;;
      *-mpc83*|*-asp834x*)
          platformo=$object/cuboot-83xx.o
          ;;
      *-tqm8541|*-mpc8560*|*-tqm8560|*-tqm8555|*-ksi8560*)
          platformo=$object/cuboot-85xx-cpm2.o
          ;;
      *-mpc85*|*-tqm85*|*-sbc85*)
          platformo=$object/cuboot-85xx.o
          ;;
      *-amigaone)
          link_address='0x800000'
          ;;
      esac
      ;;
  ps3)
      platformo="$object/ps3-head.o $object/ps3-hvcall.o $object/ps3.o"
      lds=$object/zImage.ps3.lds
      gzip=
      ext=bin
      objflags="-O binary --set-section-flags=.bss=contents,alloc,load,data"
      ksection=.kernel:vmlinux.bin
      isection=.kernel:initrd
      link_address=''
      make_space=n
      pie=
      ;;
  ep88xc|ep405|ep8248e)
      platformo="$object/fixed-head.o $object/$platform.o"
      binary=y
      ;;
  adder875-redboot)
      platformo="$object/fixed-head.o $object/redboot-8xx.o"
      binary=y
      ;;
  simpleboot-virtex405-*)
      platformo="$object/virtex405-head.o $object/simpleboot.o $object/virtex.o"
      binary=y
      ;;
  simpleboot-virtex440-*)
      platformo="$object/fixed-head.o $object/simpleboot.o $object/virtex.o"
      binary=y
      ;;
  simpleboot-*)
      platformo="$object/fixed-head.o $object/simpleboot.o"
      binary=y
      ;;
  asp834x-redboot)
      platformo="$object/fixed-head.o $object/redboot-83xx.o"
      binary=y
      ;;
  xpedite52*)
      link_address='0x1400000'
      platformo=$object/cuboot-85xx.o
      ;;
  gamecube|wii)
      link_address='0x600000'
      platformo="$object/$platform-head.o $object/$platform.o"
      ;;
  treeboot-currituck)
      link_address='0x1000000'
      ;;
  treeboot-iss4xx-mpic)
      platformo="$object/treeboot-iss4xx.o"
      ;;
  epapr)
      platformo="$object/epapr.o $object/epapr-wrapper.o"
      link_address='0x20000000'
      pie=-pie
      ;;
  mvme5100)
      platformo="$object/fixed-head.o $object/mvme5100.o"
      binary=y
      ;;
  esac
  
  vmz="$tmpdir/`basename \"$kernel\"`.$ext"
  if [ -z "$cacheit" -o ! -f "$vmz$gzip" -o "$vmz$gzip" -ot "$kernel" ]; then
      ${CROSS}objcopy $objflags "$kernel" "$vmz.$$"
  
      strip_size=$(stat -c %s $vmz.$$)
  
      if [ -n "$gzip" ]; then
          gzip -n -f -9 "$vmz.$$"
      fi
  
      if [ -n "$cacheit" ]; then
  	mv -f "$vmz.$$$gzip" "$vmz$gzip"
      else
  	vmz="$vmz.$$"
      fi
  else
      # Calculate the vmlinux.strip size
      ${CROSS}objcopy $objflags "$kernel" "$vmz.$$"
      strip_size=$(stat -c %s $vmz.$$)
      rm -f $vmz.$$
  fi
  
  if [ "$make_space" = "y" ]; then
  	# Round the size to next higher MB limit
  	round_size=$(((strip_size + 0xfffff) & 0xfff00000))
  
  	round_size=0x$(printf "%x" $round_size)
  	link_addr=$(printf "%d" $link_address)
  
  	if [ $link_addr -lt $strip_size ]; then
  	    echo "INFO: Uncompressed kernel (size 0x$(printf "%x
  " $strip_size))" \
  			"overlaps the address of the wrapper($link_address)"
  	    echo "INFO: Fixing the link_address of wrapper to ($round_size)"
  	    link_address=$round_size
  	fi
  fi
  
  vmz="$vmz$gzip"
  
  # Extract kernel version information, some platforms want to include
  # it in the image header
  version=`${CROSS}strings "$kernel" | grep '^Linux version [-0-9.]' | \
      cut -d' ' -f3`
  if [ -n "$version" ]; then
      uboot_version="-n Linux-$version"
  fi
  
  # physical offset of kernel image
  membase=`${CROSS}objdump -p "$kernel" | grep -m 1 LOAD | awk '{print $7}'`
  
  case "$platform" in
  uboot)
      rm -f "$ofile"
      ${MKIMAGE} -A ppc -O linux -T kernel -C gzip -a $membase -e $membase \
  	$uboot_version -d "$vmz" "$ofile"
      if [ -z "$cacheit" ]; then
  	rm -f "$vmz"
      fi
      exit 0
      ;;
  uboot-obs600)
      rm -f "$ofile"
      # obs600 wants a multi image with an initrd, so we need to put a fake
      # one in even when building a "normal" image.
      if [ -n "$initrd" ]; then
  	real_rd="$initrd"
      else
  	real_rd=`mktemp`
  	echo "\0" >>"$real_rd"
      fi
      ${MKIMAGE} -A ppc -O linux -T multi -C gzip -a $membase -e $membase \
  	$uboot_version -d "$vmz":"$real_rd":"$dtb" "$ofile"
      if [ -z "$initrd" ]; then
  	rm -f "$real_rd"
      fi
      if [ -z "$cacheit" ]; then
  	rm -f "$vmz"
      fi
      exit 0
      ;;
  esac
  
  addsec() {
      ${CROSS}objcopy $4 $1 \
  	--add-section=$3="$2" \
  	--set-section-flags=$3=contents,alloc,load,readonly,data
  }
  
  addsec $tmp "$vmz" $ksection $object/empty.o
  if [ -z "$cacheit" ]; then
      rm -f "$vmz"
  fi
  
  if [ -n "$initrd" ]; then
      addsec $tmp "$initrd" $isection
  fi
  
  if [ -n "$dtb" ]; then
      addsec $tmp "$dtb" .kernel:dtb
      if [ -n "$dts" ]; then
  	rm $dtb
      fi
  fi
  
  if [ "$platform" != "miboot" ]; then
      if [ -n "$link_address" ] ; then
          text_start="-Ttext $link_address"
      fi
      ${CROSS}ld -m elf32ppc -T $lds $text_start $pie -o "$ofile" \
  	$platformo $tmp $object/wrapper.a
      rm $tmp
  fi
  
  # Some platforms need the zImage's entry point and base address
  base=0x`${CROSS}nm "$ofile" | grep ' _start$' | cut -d' ' -f1`
  entry=`${CROSS}objdump -f "$ofile" | grep '^start address ' | cut -d' ' -f3`
  
  if [ -n "$binary" ]; then
      mv "$ofile" "$ofile".elf
      ${CROSS}objcopy -O binary "$ofile".elf "$ofile"
  fi
  
  # post-processing needed for some platforms
  case "$platform" in
  pseries|chrp|maple)
      $objbin/addnote "$ofile"
      ;;
  coff)
      ${CROSS}objcopy -O aixcoff-rs6000 --set-start "$entry" "$ofile"
      $objbin/hack-coff "$ofile"
      ;;
  cuboot*)
      gzip -n -f -9 "$ofile"
      ${MKIMAGE} -A ppc -O linux -T kernel -C gzip -a "$base" -e "$entry" \
              $uboot_version -d "$ofile".gz "$ofile"
      ;;
  treeboot*)
      mv "$ofile" "$ofile.elf"
      $objbin/mktree "$ofile.elf" "$ofile" "$base" "$entry"
      if [ -z "$cacheit" ]; then
  	rm -f "$ofile.elf"
      fi
      exit 0
      ;;
  ps3)
      # The ps3's loader supports loading a gzipped binary image from flash
      # rom to ram addr zero. The loader then enters the system reset
      # vector at addr 0x100.  A bootwrapper overlay is used to arrange for
      # a binary image of the kernel to be at addr zero, and yet have a
      # suitable bootwrapper entry at 0x100.  To construct the final rom
      # image 512 bytes from offset 0x100 is copied to the bootwrapper
      # place holder at symbol __system_reset_kernel.  The 512 bytes of the
      # bootwrapper entry code at symbol __system_reset_overlay is then
      # copied to offset 0x100.  At runtime the bootwrapper program copies
      # the data at __system_reset_kernel back to addr 0x100.
  
      system_reset_overlay=0x`${CROSS}nm "$ofile" \
          | grep ' __system_reset_overlay$'       \
          | cut -d' ' -f1`
      system_reset_overlay=`printf "%d" $system_reset_overlay`
      system_reset_kernel=0x`${CROSS}nm "$ofile" \
          | grep ' __system_reset_kernel$'       \
          | cut -d' ' -f1`
      system_reset_kernel=`printf "%d" $system_reset_kernel`
      overlay_dest="256"
      overlay_size="512"
  
      ${CROSS}objcopy -O binary "$ofile" "$ofile.bin"
  
      dd if="$ofile.bin" of="$ofile.bin" conv=notrunc   \
          skip=$overlay_dest seek=$system_reset_kernel  \
          count=$overlay_size bs=1
  
      dd if="$ofile.bin" of="$ofile.bin" conv=notrunc   \
          skip=$system_reset_overlay seek=$overlay_dest \
          count=$overlay_size bs=1
  
      odir="$(dirname "$ofile.bin")"
      rm -f "$odir/otheros.bld"
      gzip -n --force -9 --stdout "$ofile.bin" > "$odir/otheros.bld"
      ;;
  esac