arch/ppc64/boot/Makefile

   1 # Makefile for making ELF bootable images for booting on CHRP
   2 # using Open Firmware.
   3 #
   4 # Geert Uytterhoeven    September 1997
   5 #
   6 # Based on coffboot by Paul Mackerras
   7 # Simplified for ppc64 by Todd Inglett
   8 #
   9 # NOTE: this code is built for 32 bit in ELF32 format even though
  10 #       it packages a 64 bit kernel.  We do this to simplify the
  11 #       bootloader and increase compatibility with OpenFirmware.
  12 #
  13 #       To this end we need to define BOOTCC, etc, as the tools
  14 #       needed to build the 32 bit image.  These are normally HOSTCC,
  15 #       but may be a third compiler if, for example, you are cross
  16 #       compiling from an intel box.  Once the 64bit ppc gcc is
  17 #       stable it will probably simply be a compiler switch to
  18 #       compile for 32bit mode.
  19 #       To make it easier to setup a cross compiler,
  20 #       CROSS32_COMPILE is setup as a prefix just like CROSS_COMPILE
  21 #       in the toplevel makefile.
  22
  23
  24 HOSTCC          := gcc
  25 BOOTCFLAGS      := $(HOSTCFLAGS) $(LINUXINCLUDE) -fno-builtin
  26 BOOTAFLAGS      := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional
  27 BOOTLFLAGS      := -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
  28 OBJCOPYFLAGS    := contents,alloc,load,readonly,data
  29
  30 src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S
  31 src-boot := $(addprefix $(obj)/, $(src-boot))
  32 obj-boot := $(addsuffix .o, $(basename $(src-boot)))
  33
  34 quiet_cmd_bootcc = BOOTCC  $@
  35       cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
  36
  37 quiet_cmd_bootas = BOOTAS  $@
  38       cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
  39
  40 $(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
  41         $(call if_changed_dep,bootcc)
  42 $(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
  43         $(call if_changed_dep,bootas)
  44
  45 #-----------------------------------------------------------
  46 # ELF sections within the zImage bootloader/wrapper
  47 #-----------------------------------------------------------
  48 required := vmlinux.strip
  49 initrd   := initrd
  50
  51 obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
  52 src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
  53 gz-sec  = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
  54
  55 hostprogs-y             := piggy addnote addRamDisk
  56 targets                 += zImage zImage.initrd imagesize.c \
  57                            $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
  58                            $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
  59                            $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
  60                            vmlinux.initrd
  61 extra-y                 := initrd.o
  62
  63 quiet_cmd_ramdisk = RAMDISK $@
  64       cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
  65
  66 quiet_cmd_stripvm = STRIP $@
  67       cmd_stripvm = $(STRIP) -s $< -o $@
  68
  69 vmlinux.strip: vmlinux FORCE
  70         $(call if_changed,stripvm)
  71 $(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz FORCE
  72         $(call if_changed,ramdisk)
  73
  74 addsection = $(CROSS32OBJCOPY) $(1) \
  75                 --add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $(1)))=$(patsubst %.o,%.gz, $(1)) \
  76                 --set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $(1)))=$(OBJCOPYFLAGS)
  77
  78 quiet_cmd_addnote = ADDNOTE $@
  79       cmd_addnote = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(obj-boot) && $(obj)/addnote $@
  80
  81 quiet_cmd_piggy = PIGGY   $@
  82       cmd_piggy = $(obj)/piggyback $(@:.o=) < $< | $(CROSS32AS) -o $@
  83
  84 $(call gz-sec, $(required)): $(obj)/kernel-%.gz: % FORCE
  85         $(call if_changed,gzip)
  86
  87 $(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
  88         cp -f $(obj)/ramdisk.image.gz $@
  89
  90 $(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz FORCE
  91         touch $@
  92
  93 $(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c FORCE
  94         $(call if_changed_dep,bootcc)
  95         $(call addsection, $@)
  96
  97 $(obj)/zImage: obj-boot += $(call obj-sec, $(required))
  98 $(obj)/zImage: $(call obj-sec, $(required)) $(obj-boot) $(obj)/addnote FORCE
  99         $(call if_changed,addnote)
 100
 101 $(obj)/zImage.initrd: obj-boot += $(call obj-sec, $(required) $(initrd))
 102 $(obj)/zImage.initrd: $(call obj-sec, $(required) $(initrd)) $(obj-boot) $(obj)/addnote FORCE
 103         $(call if_changed,addnote)
 104
 105 $(obj)/imagesize.c: vmlinux.strip
 106         @echo Generating $@
 107         ls -l vmlinux.strip | \
 108         awk '{printf "/* generated -- do not edit! */\n" \
 109                 "unsigned long vmlinux_filesize = %d;\n", $$5}' > $(obj)/imagesize.c
 110         $(CROSS_COMPILE)nm -n vmlinux | tail -n 1 | \
 111         awk '{printf "unsigned long vmlinux_memsize = 0x%s;\n", substr($$1,8)}' \
 112                 >> $(obj)/imagesize.c
 113
 114 install: $(CONFIGURE) $(BOOTIMAGE)
 115         sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
 116
 117 clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)