1# Unified Makefile for i386 and x86_64 2 3# select defconfig based on actual architecture 4ifeq ($(ARCH),x86) 5 KBUILD_DEFCONFIG := i386_defconfig 6else 7 KBUILD_DEFCONFIG := $(ARCH)_defconfig 8endif 9 10# BITS is used as extension for files which are available in a 32 bit 11# and a 64 bit version to simplify shared Makefiles. 12# e.g.: obj-y += foo_$(BITS).o 13export BITS 14 15ifeq ($(CONFIG_X86_32),y) 16 BITS := 32 17 UTS_MACHINE := i386 18 CHECKFLAGS += -D__i386__ 19 20 biarch := $(call cc-option,-m32) 21 KBUILD_AFLAGS += $(biarch) 22 KBUILD_CFLAGS += $(biarch) 23 24 ifdef CONFIG_RELOCATABLE 25 LDFLAGS_vmlinux := --emit-relocs 26 endif 27 28 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return 29 30 # prevent gcc from keeping the stack 16 byte aligned 31 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) 32 33 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use 34 # a lot more stack due to the lack of sharing of stacklots: 35 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \ 36 $(call cc-option,-fno-unit-at-a-time)) 37 38 # CPU-specific tuning. Anything which can be shared with UML should go here. 39 include $(srctree)/arch/x86/Makefile_32.cpu 40 KBUILD_CFLAGS += $(cflags-y) 41 42 # temporary until string.h is fixed 43 KBUILD_CFLAGS += -ffreestanding 44else 45 BITS := 64 46 UTS_MACHINE := x86_64 47 CHECKFLAGS += -D__x86_64__ -m64 48 49 KBUILD_AFLAGS += -m64 50 KBUILD_CFLAGS += -m64 51 52 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) 53 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) 54 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) 55 56 cflags-$(CONFIG_MCORE2) += \ 57 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) 58 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ 59 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 60 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 61 KBUILD_CFLAGS += $(cflags-y) 62 63 KBUILD_CFLAGS += -mno-red-zone 64 KBUILD_CFLAGS += -mcmodel=kernel 65 66 # -funit-at-a-time shrinks the kernel .text considerably 67 # unfortunately it makes reading oopses harder. 68 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 69 70 # this works around some issues with generating unwind tables in older gccs 71 # newer gccs do it by default 72 KBUILD_CFLAGS += -maccumulate-outgoing-args 73endif 74 75ifdef CONFIG_CC_STACKPROTECTOR 76 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 77 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(biarch)),y) 78 stackp-y := -fstack-protector 79 stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all 80 KBUILD_CFLAGS += $(stackp-y) 81 else 82 $(warning stack protector enabled but no compiler support) 83 endif 84endif 85 86# Don't unroll struct assignments with kmemcheck enabled 87ifeq ($(CONFIG_KMEMCHECK),y) 88 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) 89endif 90 91# Stackpointer is addressed different for 32 bit and 64 bit x86 92sp-$(CONFIG_X86_32) := esp 93sp-$(CONFIG_X86_64) := rsp 94 95# do binutils support CFI? 96cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 97# is .cfi_signal_frame supported too? 98cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 99KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) 100KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) 101 102LDFLAGS := -m elf_$(UTS_MACHINE) 103 104# Speed up the build 105KBUILD_CFLAGS += -pipe 106# Workaround for a gcc prelease that unfortunately was shipped in a suse release 107KBUILD_CFLAGS += -Wno-sign-compare 108# 109KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 110# prevent gcc from generating any FP code by mistake 111KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,) 112 113KBUILD_CFLAGS += $(mflags-y) 114KBUILD_AFLAGS += $(mflags-y) 115 116### 117# Kernel objects 118 119head-y := arch/x86/kernel/head_$(BITS).o 120head-y += arch/x86/kernel/head$(BITS).o 121head-y += arch/x86/kernel/head.o 122head-y += arch/x86/kernel/init_task.o 123 124libs-y += arch/x86/lib/ 125 126# See arch/x86/Kbuild for content of core part of the kernel 127core-y += arch/x86/ 128 129# drivers-y are linked after core-y 130drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 131drivers-$(CONFIG_PCI) += arch/x86/pci/ 132 133# must be linked after kernel/ 134drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 135 136# suspend and hibernation support 137drivers-$(CONFIG_PM) += arch/x86/power/ 138 139ifeq ($(CONFIG_X86_32),y) 140drivers-$(CONFIG_FB) += arch/x86/video/ 141endif 142 143#### 144# boot loader support. Several targets are kept for legacy purposes 145 146boot := arch/x86/boot 147 148BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 149 150PHONY += bzImage $(BOOT_TARGETS) 151 152# Default kernel to build 153all: bzImage 154 155# KBUILD_IMAGE specify target image being built 156KBUILD_IMAGE := $(boot)/bzImage 157 158bzImage: vmlinux 159 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 160 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 161 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 162 163$(BOOT_TARGETS): vmlinux 164 $(Q)$(MAKE) $(build)=$(boot) $@ 165 166PHONY += install 167install: 168 $(Q)$(MAKE) $(build)=$(boot) $@ 169 170PHONY += vdso_install 171vdso_install: 172 $(Q)$(MAKE) $(build)=arch/x86/vdso $@ 173 174archclean: 175 $(Q)rm -rf $(objtree)/arch/i386 176 $(Q)rm -rf $(objtree)/arch/x86_64 177 $(Q)$(MAKE) $(clean)=$(boot) 178 179define archhelp 180 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 181 echo ' install - Install kernel using' 182 echo ' (your) ~/bin/installkernel or' 183 echo ' (distribution) /sbin/installkernel or' 184 echo ' install to $$(INSTALL_PATH) and run lilo' 185 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 186 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 187 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 188 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 189 echo ' bzdisk/fdimage*/isoimage also accept:' 190 echo ' FDARGS="..." arguments for the booted kernel' 191 echo ' FDINITRD=file initrd for the booted kernel' 192endef 193