1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
117 lines
4.5 KiB
Makefile
117 lines
4.5 KiB
Makefile
# Makefile for making ELF bootable images for booting on CHRP
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# using Open Firmware.
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#
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# Geert Uytterhoeven September 1997
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#
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# Based on coffboot by Paul Mackerras
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# Simplified for ppc64 by Todd Inglett
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#
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# NOTE: this code is built for 32 bit in ELF32 format even though
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# it packages a 64 bit kernel. We do this to simplify the
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# bootloader and increase compatibility with OpenFirmware.
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#
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# To this end we need to define BOOTCC, etc, as the tools
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# needed to build the 32 bit image. These are normally HOSTCC,
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# but may be a third compiler if, for example, you are cross
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# compiling from an intel box. Once the 64bit ppc gcc is
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# stable it will probably simply be a compiler switch to
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# compile for 32bit mode.
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# To make it easier to setup a cross compiler,
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# CROSS32_COMPILE is setup as a prefix just like CROSS_COMPILE
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# in the toplevel makefile.
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HOSTCC := gcc
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BOOTCFLAGS := $(HOSTCFLAGS) $(LINUXINCLUDE) -fno-builtin
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BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional
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BOOTLFLAGS := -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
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OBJCOPYFLAGS := contents,alloc,load,readonly,data
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src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S
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src-boot := $(addprefix $(obj)/, $(src-boot))
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obj-boot := $(addsuffix .o, $(basename $(src-boot)))
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quiet_cmd_bootcc = BOOTCC $@
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cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
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quiet_cmd_bootas = BOOTAS $@
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cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
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$(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
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$(call if_changed_dep,bootcc)
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$(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
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$(call if_changed_dep,bootas)
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#-----------------------------------------------------------
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# ELF sections within the zImage bootloader/wrapper
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#-----------------------------------------------------------
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required := vmlinux.strip
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initrd := initrd
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obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
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src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
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gz-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
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hostprogs-y := piggy addnote addRamDisk
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targets += zImage zImage.initrd imagesize.c \
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$(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
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$(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
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$(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
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vmlinux.initrd
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extra-y := initrd.o
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quiet_cmd_ramdisk = RAMDISK $@
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cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
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quiet_cmd_stripvm = STRIP $@
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cmd_stripvm = $(STRIP) -s $< -o $@
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vmlinux.strip: vmlinux FORCE
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$(call if_changed,stripvm)
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$(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz FORCE
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$(call if_changed,ramdisk)
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addsection = $(CROSS32OBJCOPY) $(1) \
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--add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $(1)))=$(patsubst %.o,%.gz, $(1)) \
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--set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $(1)))=$(OBJCOPYFLAGS)
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quiet_cmd_addnote = ADDNOTE $@
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cmd_addnote = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(obj-boot) && $(obj)/addnote $@
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quiet_cmd_piggy = PIGGY $@
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cmd_piggy = $(obj)/piggyback $(@:.o=) < $< | $(CROSS32AS) -o $@
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$(call gz-sec, $(required)): $(obj)/kernel-%.gz: % FORCE
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$(call if_changed,gzip)
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$(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
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cp -f $(obj)/ramdisk.image.gz $@
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$(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz FORCE
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touch $@
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$(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c FORCE
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$(call if_changed_dep,bootcc)
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$(call addsection, $@)
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$(obj)/zImage: obj-boot += $(call obj-sec, $(required))
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$(obj)/zImage: $(call obj-sec, $(required)) $(obj-boot) $(obj)/addnote FORCE
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$(call if_changed,addnote)
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$(obj)/zImage.initrd: obj-boot += $(call obj-sec, $(required) $(initrd))
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$(obj)/zImage.initrd: $(call obj-sec, $(required) $(initrd)) $(obj-boot) $(obj)/addnote FORCE
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$(call if_changed,addnote)
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$(obj)/imagesize.c: vmlinux.strip
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@echo Generating $@
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ls -l vmlinux.strip | \
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awk '{printf "/* generated -- do not edit! */\n" \
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"unsigned long vmlinux_filesize = %d;\n", $$5}' > $(obj)/imagesize.c
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$(CROSS_COMPILE)nm -n vmlinux | tail -n 1 | \
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awk '{printf "unsigned long vmlinux_memsize = 0x%s;\n", substr($$1,8)}' \
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>> $(obj)/imagesize.c
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install: $(CONFIGURE) $(BOOTIMAGE)
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sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
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clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)
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