Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
24HOSTCC := gcc
25BOOTCFLAGS := $(HOSTCFLAGS) $(LINUXINCLUDE) -fno-builtin
26BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional
27BOOTLFLAGS := -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
28OBJCOPYFLAGS := contents,alloc,load,readonly,data
29
30src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S
31src-boot := $(addprefix $(obj)/, $(src-boot))
32obj-boot := $(addsuffix .o, $(basename $(src-boot)))
33
34quiet_cmd_bootcc = BOOTCC $@
35 cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
36
37quiet_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#-----------------------------------------------------------
48required := vmlinux.strip
49initrd := initrd
50
51obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
52src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
53gz-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
54
55hostprogs-y := piggy addnote addRamDisk
56targets += 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
61extra-y := initrd.o
62
63quiet_cmd_ramdisk = RAMDISK $@
64 cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
65
66quiet_cmd_stripvm = STRIP $@
67 cmd_stripvm = $(STRIP) -s $< -o $@
68
69vmlinux.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
74addsection = $(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
78quiet_cmd_addnote = ADDNOTE $@
79 cmd_addnote = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(obj-boot) && $(obj)/addnote $@
80
81quiet_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
114install: $(CONFIGURE) $(BOOTIMAGE)
115 sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
116
117clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)