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) -fno-builtin -nostdinc -isystem $(shell $(CROSS32CC) -print-file-name=include)
  26 BOOTAFLAGS      := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
  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 quiet_cmd_bootld = BOOTLD  $@
  41       cmd_bootld = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(2)
  42
  43 $(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
  44         $(call if_changed_dep,bootcc)
  45 $(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
  46         $(call if_changed_dep,bootas)
  47
  48 #-----------------------------------------------------------
  49 # ELF sections within the zImage bootloader/wrapper
  50 #-----------------------------------------------------------
  51 required := vmlinux.strip
  52 initrd   := initrd
  53
  54 obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
  55 src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
  56 gz-sec  = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
  57
  58 hostprogs-y             := addnote addRamDisk
  59 targets                 += zImage.vmode zImage.initrd.vmode zImage zImage.initrd imagesize.c \
  60                            $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
  61                            $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
  62                            $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
  63                            vmlinux.initrd
  64 extra-y                 := initrd.o
  65
  66 quiet_cmd_ramdisk = RAMDISK $@
  67       cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
  68
  69 quiet_cmd_stripvm = STRIP   $@
  70       cmd_stripvm = $(STRIP) -s $< -o $@
  71
  72 vmlinux.strip: vmlinux FORCE
  73         $(call if_changed,stripvm)
  74 $(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz FORCE
  75         $(call if_changed,ramdisk)
  76
  77 quiet_cmd_addsection = ADDSEC  $@
  78       cmd_addsection = $(CROSS32OBJCOPY) $@ \
  79                 --add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(patsubst %.o,%.gz, $@) \
  80                 --set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(OBJCOPYFLAGS)
  81
  82 quiet_cmd_imagesize = GENSIZE $@
  83       cmd_imagesize = ls -l vmlinux.strip | \
  84                 awk '{printf "/* generated -- do not edit! */\n" "unsigned long vmlinux_filesize = %d;\n", $$5}' \
  85                 > $(obj)/imagesize.c && \
  86                 $(CROSS_COMPILE)nm -n vmlinux | tail -n 1 | \
  87                 awk '{printf "unsigned long vmlinux_memsize = 0x%s;\n", substr($$1,8)}' >> $(obj)/imagesize.c
  88
  89 quiet_cmd_addnote = ADDNOTE $@
  90       cmd_addnote = $(obj)/addnote $@
  91
  92 $(call gz-sec, $(required)): $(obj)/kernel-%.gz: % FORCE
  93         $(call if_changed,gzip)
  94
  95 $(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
  96         cp -f $(obj)/ramdisk.image.gz $@
  97
  98 $(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz FORCE
  99         @touch $@
 100
 101 $(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c FORCE
 102         $(call if_changed_dep,bootcc)
 103         $(call cmd,addsection)
 104
 105 $(obj)/zImage.vmode: obj-boot += $(call obj-sec, $(required))
 106 $(obj)/zImage.vmode: $(call obj-sec, $(required)) $(obj-boot) FORCE
 107         $(call cmd,bootld,$(obj-boot))
 108
 109 $(obj)/zImage.initrd.vmode: obj-boot += $(call obj-sec, $(required) $(initrd))
 110 $(obj)/zImage.initrd.vmode: $(call obj-sec, $(required) $(initrd)) $(obj-boot) FORCE
 111         $(call cmd,bootld,$(obj-boot))
 112
 113 $(obj)/zImage: $(obj)/zImage.vmode $(obj)/addnote FORCE
 114         @cp -f $< $@
 115         $(call if_changed,addnote)
 116
 117 $(obj)/zImage.initrd: $(obj)/zImage.initrd.vmode $(obj)/addnote FORCE
 118         @cp -f $< $@
 119         $(call if_changed,addnote)
 120
 121 $(obj)/imagesize.c: vmlinux.strip
 122         $(call cmd,imagesize)
 123
 124 install: $(CONFIGURE) $(BOOTIMAGE)
 125         sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
 126
 127 clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)